imgtec-ci20: genimage config/ u-boot env

[openadk.git] / target / linux / patches / 4.4.302 / patch-realtime

diff --git a/Documentation/hwlat_detector.txt b/Documentation/hwlat_detector.txt
new file mode 100644
index 000000000000..cb61516483d3
--- /dev/null
+++ b/Documentation/hwlat_detector.txt
@@ -0,0 +1,64 @@
+Introduction:
+-------------
+
+The module hwlat_detector is a special purpose kernel module that is used to
+detect large system latencies induced by the behavior of certain underlying
+hardware or firmware, independent of Linux itself. The code was developed
+originally to detect SMIs (System Management Interrupts) on x86 systems,
+however there is nothing x86 specific about this patchset. It was
+originally written for use by the "RT" patch since the Real Time
+kernel is highly latency sensitive.
+
+SMIs are usually not serviced by the Linux kernel, which typically does not
+even know that they are occuring. SMIs are instead are set up by BIOS code
+and are serviced by BIOS code, usually for "critical" events such as
+management of thermal sensors and fans. Sometimes though, SMIs are used for
+other tasks and those tasks can spend an inordinate amount of time in the
+handler (sometimes measured in milliseconds). Obviously this is a problem if
+you are trying to keep event service latencies down in the microsecond range.
+
+The hardware latency detector works by hogging all of the cpus for configurable
+amounts of time (by calling stop_machine()), polling the CPU Time Stamp Counter
+for some period, then looking for gaps in the TSC data. Any gap indicates a
+time when the polling was interrupted and since the machine is stopped and
+interrupts turned off the only thing that could do that would be an SMI.
+
+Note that the SMI detector should *NEVER* be used in a production environment.
+It is intended to be run manually to determine if the hardware platform has a
+problem with long system firmware service routines.
+
+Usage:
+------
+
+Loading the module hwlat_detector passing the parameter "enabled=1" (or by
+setting the "enable" entry in "hwlat_detector" debugfs toggled on) is the only
+step required to start the hwlat_detector. It is possible to redefine the
+threshold in microseconds (us) above which latency spikes will be taken
+into account (parameter "threshold=").
+
+Example:
+
+       # modprobe hwlat_detector enabled=1 threshold=100
+
+After the module is loaded, it creates a directory named "hwlat_detector" under
+the debugfs mountpoint, "/debug/hwlat_detector" for this text. It is necessary
+to have debugfs mounted, which might be on /sys/debug on your system.
+
+The /debug/hwlat_detector interface contains the following files:
+
+count                  - number of latency spikes observed since last reset
+enable                 - a global enable/disable toggle (0/1), resets count
+max                    - maximum hardware latency actually observed (usecs)
+sample                 - a pipe from which to read current raw sample data
+                         in the format <timestamp> <latency observed usecs>
+                         (can be opened O_NONBLOCK for a single sample)
+threshold              - minimum latency value to be considered (usecs)
+width                  - time period to sample with CPUs held (usecs)
+                         must be less than the total window size (enforced)
+window                 - total period of sampling, width being inside (usecs)
+
+By default we will set width to 500,000 and window to 1,000,000, meaning that
+we will sample every 1,000,000 usecs (1s) for 500,000 usecs (0.5s). If we
+observe any latencies that exceed the threshold (initially 100 usecs),
+then we write to a global sample ring buffer of 8K samples, which is
+consumed by reading from the "sample" (pipe) debugfs file interface.
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 39280b72f27a..c46295a8d55b 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1640,6 +1640,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
        ip=             [IP_PNP]
                        See Documentation/filesystems/nfs/nfsroot.txt.
 
+       irqaffinity=    [SMP] Set the default irq affinity mask
+                       Format:
+                       <cpu number>,...,<cpu number>
+                       or
+                       <cpu number>-<cpu number>
+                       (must be a positive range in ascending order)
+                       or a mixture
+                       <cpu number>,...,<cpu number>-<cpu number>
+
        irqfixup        [HW]
                        When an interrupt is not handled search all handlers
                        for it. Intended to get systems with badly broken
diff --git a/Documentation/sysrq.txt b/Documentation/sysrq.txt
index 13f5619b2203..f64d075ba647 100644
--- a/Documentation/sysrq.txt
+++ b/Documentation/sysrq.txt
@@ -59,10 +59,17 @@ On PowerPC - Press 'ALT - Print Screen (or F13) - <command key>,
 On other - If you know of the key combos for other architectures, please
            let me know so I can add them to this section.
 
-On all -  write a character to /proc/sysrq-trigger.  e.g.:
-
+On all -  write a character to /proc/sysrq-trigger, e.g.:
                echo t > /proc/sysrq-trigger
 
+On all - Enable network SysRq by writing a cookie to icmp_echo_sysrq, e.g.
+               echo 0x01020304 >/proc/sys/net/ipv4/icmp_echo_sysrq
+        Send an ICMP echo request with this pattern plus the particular
+        SysRq command key. Example:
+               # ping -c1 -s57 -p0102030468
+        will trigger the SysRq-H (help) command.
+
+
 *  What are the 'command' keys?
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 'b'     - Will immediately reboot the system without syncing or unmounting
diff --git a/Documentation/trace/histograms.txt b/Documentation/trace/histograms.txt
new file mode 100644
index 000000000000..6f2aeabf7faa
--- /dev/null
+++ b/Documentation/trace/histograms.txt
@@ -0,0 +1,186 @@
+               Using the Linux Kernel Latency Histograms
+
+
+This document gives a short explanation how to enable, configure and use
+latency histograms. Latency histograms are primarily relevant in the
+context of real-time enabled kernels (CONFIG_PREEMPT/CONFIG_PREEMPT_RT)
+and are used in the quality management of the Linux real-time
+capabilities.
+
+
+* Purpose of latency histograms
+
+A latency histogram continuously accumulates the frequencies of latency
+data. There are two types of histograms
+- potential sources of latencies
+- effective latencies
+
+
+* Potential sources of latencies
+
+Potential sources of latencies are code segments where interrupts,
+preemption or both are disabled (aka critical sections). To create
+histograms of potential sources of latency, the kernel stores the time
+stamp at the start of a critical section, determines the time elapsed
+when the end of the section is reached, and increments the frequency
+counter of that latency value - irrespective of whether any concurrently
+running process is affected by latency or not.
+- Configuration items (in the Kernel hacking/Tracers submenu)
+  CONFIG_INTERRUPT_OFF_LATENCY
+  CONFIG_PREEMPT_OFF_LATENCY
+
+
+* Effective latencies
+
+Effective latencies are actually occuring during wakeup of a process. To
+determine effective latencies, the kernel stores the time stamp when a
+process is scheduled to be woken up, and determines the duration of the
+wakeup time shortly before control is passed over to this process. Note
+that the apparent latency in user space may be somewhat longer, since the
+process may be interrupted after control is passed over to it but before
+the execution in user space takes place. Simply measuring the interval
+between enqueuing and wakeup may also not appropriate in cases when a
+process is scheduled as a result of a timer expiration. The timer may have
+missed its deadline, e.g. due to disabled interrupts, but this latency
+would not be registered. Therefore, the offsets of missed timers are
+recorded in a separate histogram. If both wakeup latency and missed timer
+offsets are configured and enabled, a third histogram may be enabled that
+records the overall latency as a sum of the timer latency, if any, and the
+wakeup latency. This histogram is called "timerandwakeup".
+- Configuration items (in the Kernel hacking/Tracers submenu)
+  CONFIG_WAKEUP_LATENCY
+  CONFIG_MISSED_TIMER_OFSETS
+
+
+* Usage
+
+The interface to the administration of the latency histograms is located
+in the debugfs file system. To mount it, either enter
+
+mount -t sysfs nodev /sys
+mount -t debugfs nodev /sys/kernel/debug
+
+from shell command line level, or add
+
+nodev  /sys                    sysfs   defaults        0 0
+nodev  /sys/kernel/debug       debugfs defaults        0 0
+
+to the file /etc/fstab. All latency histogram related files are then
+available in the directory /sys/kernel/debug/tracing/latency_hist. A
+particular histogram type is enabled by writing non-zero to the related
+variable in the /sys/kernel/debug/tracing/latency_hist/enable directory.
+Select "preemptirqsoff" for the histograms of potential sources of
+latencies and "wakeup" for histograms of effective latencies etc. The
+histogram data - one per CPU - are available in the files
+
+/sys/kernel/debug/tracing/latency_hist/preemptoff/CPUx
+/sys/kernel/debug/tracing/latency_hist/irqsoff/CPUx
+/sys/kernel/debug/tracing/latency_hist/preemptirqsoff/CPUx
+/sys/kernel/debug/tracing/latency_hist/wakeup/CPUx
+/sys/kernel/debug/tracing/latency_hist/wakeup/sharedprio/CPUx
+/sys/kernel/debug/tracing/latency_hist/missed_timer_offsets/CPUx
+/sys/kernel/debug/tracing/latency_hist/timerandwakeup/CPUx
+
+The histograms are reset by writing non-zero to the file "reset" in a
+particular latency directory. To reset all latency data, use
+
+#!/bin/sh
+
+TRACINGDIR=/sys/kernel/debug/tracing
+HISTDIR=$TRACINGDIR/latency_hist
+
+if test -d $HISTDIR
+then
+  cd $HISTDIR
+  for i in `find . | grep /reset$`
+  do
+    echo 1 >$i
+  done
+fi
+
+
+* Data format
+
+Latency data are stored with a resolution of one microsecond. The
+maximum latency is 10,240 microseconds. The data are only valid, if the
+overflow register is empty. Every output line contains the latency in
+microseconds in the first row and the number of samples in the second
+row. To display only lines with a positive latency count, use, for
+example,
+
+grep -v " 0$" /sys/kernel/debug/tracing/latency_hist/preemptoff/CPU0
+
+#Minimum latency: 0 microseconds.
+#Average latency: 0 microseconds.
+#Maximum latency: 25 microseconds.
+#Total samples: 3104770694
+#There are 0 samples greater or equal than 10240 microseconds
+#usecs          samples
+    0        2984486876
+    1          49843506
+    2          58219047
+    3           5348126
+    4           2187960
+    5           3388262
+    6            959289
+    7            208294
+    8             40420
+    9              4485
+   10             14918
+   11             18340
+   12             25052
+   13             19455
+   14              5602
+   15               969
+   16                47
+   17                18
+   18                14
+   19                 1
+   20                 3
+   21                 2
+   22                 5
+   23                 2
+   25                 1
+
+
+* Wakeup latency of a selected process
+
+To only collect wakeup latency data of a particular process, write the
+PID of the requested process to
+
+/sys/kernel/debug/tracing/latency_hist/wakeup/pid
+
+PIDs are not considered, if this variable is set to 0.
+
+
+* Details of the process with the highest wakeup latency so far
+
+Selected data of the process that suffered from the highest wakeup
+latency that occurred in a particular CPU are available in the file
+
+/sys/kernel/debug/tracing/latency_hist/wakeup/max_latency-CPUx.
+
+In addition, other relevant system data at the time when the
+latency occurred are given.
+
+The format of the data is (all in one line):
+<PID> <Priority> <Latency> (<Timeroffset>) <Command> \
+<- <PID> <Priority> <Command> <Timestamp>
+
+The value of <Timeroffset> is only relevant in the combined timer
+and wakeup latency recording. In the wakeup recording, it is
+always 0, in the missed_timer_offsets recording, it is the same
+as <Latency>.
+
+When retrospectively searching for the origin of a latency and
+tracing was not enabled, it may be helpful to know the name and
+some basic data of the task that (finally) was switching to the
+late real-tlme task. In addition to the victim's data, also the
+data of the possible culprit are therefore displayed after the
+"<-" symbol.
+
+Finally, the timestamp of the time when the latency occurred
+in <seconds>.<microseconds> after the most recent system boot
+is provided.
+
+These data are also reset when the wakeup histogram is reset.
diff --git a/Makefile b/Makefile
index 07070a1e6292..f04a8b6444b9 100644
--- a/Makefile
+++ b/Makefile
@@ -797,6 +797,9 @@ KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
 # Prohibit date/time macros, which would make the build non-deterministic
 KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
 
+# enforce correct pointer usage
+KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
+
 # use the deterministic mode of AR if available
 KBUILD_ARFLAGS := $(call ar-option,D)
 
diff --git a/arch/Kconfig b/arch/Kconfig
index 4e949e58b192..3b26d76933fb 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -9,6 +9,7 @@ config OPROFILE
        tristate "OProfile system profiling"
        depends on PROFILING
        depends on HAVE_OPROFILE
+       depends on !PREEMPT_RT_FULL
        select RING_BUFFER
        select RING_BUFFER_ALLOW_SWAP
        help
@@ -52,6 +53,7 @@ config KPROBES
 config JUMP_LABEL
        bool "Optimize very unlikely/likely branches"
        depends on HAVE_ARCH_JUMP_LABEL
+       depends on (!INTERRUPT_OFF_HIST && !PREEMPT_OFF_HIST && !WAKEUP_LATENCY_HIST && !MISSED_TIMER_OFFSETS_HIST)
        help
          This option enables a transparent branch optimization that
         makes certain almost-always-true or almost-always-false branch
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 34e1569a11ee..79c4603e9453 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -33,7 +33,7 @@ config ARM
        select HARDIRQS_SW_RESEND
        select HAVE_ARCH_AUDITSYSCALL if (AEABI && !OABI_COMPAT)
        select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
-       select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32
+       select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !PREEMPT_RT_BASE
        select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32
        select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
        select HAVE_ARCH_TRACEHOOK
@@ -68,6 +68,7 @@ config ARM
        select HAVE_PERF_EVENTS
        select HAVE_PERF_REGS
        select HAVE_PERF_USER_STACK_DUMP
+       select HAVE_PREEMPT_LAZY
        select HAVE_RCU_TABLE_FREE if (SMP && ARM_LPAE)
        select HAVE_REGS_AND_STACK_ACCESS_API
        select HAVE_SYSCALL_TRACEPOINTS
diff --git a/arch/arm/include/asm/switch_to.h b/arch/arm/include/asm/switch_to.h
index 12ebfcc1d539..c962084605bc 100644
--- a/arch/arm/include/asm/switch_to.h
+++ b/arch/arm/include/asm/switch_to.h
@@ -3,6 +3,13 @@
 
 #include <linux/thread_info.h>
 
+#if defined CONFIG_PREEMPT_RT_FULL && defined CONFIG_HIGHMEM
+void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p);
+#else
+static inline void
+switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) { }
+#endif
+
 /*
  * For v7 SMP cores running a preemptible kernel we may be pre-empted
  * during a TLB maintenance operation, so execute an inner-shareable dsb
@@ -25,6 +32,7 @@ extern struct task_struct *__switch_to(struct task_struct *, struct thread_info
 #define switch_to(prev,next,last)                                      \
 do {                                                                   \
        __complete_pending_tlbi();                                      \
+       switch_kmaps(prev, next);                                       \
        last = __switch_to(prev,task_thread_info(prev), task_thread_info(next));        \
 } while (0)
 
diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
index 776757d1604a..1f36a4eccc72 100644
--- a/arch/arm/include/asm/thread_info.h
+++ b/arch/arm/include/asm/thread_info.h
@@ -49,6 +49,7 @@ struct cpu_context_save {
 struct thread_info {
        unsigned long           flags;          /* low level flags */
        int                     preempt_count;  /* 0 => preemptable, <0 => bug */
+       int                     preempt_lazy_count; /* 0 => preemptable, <0 => bug */
        mm_segment_t            addr_limit;     /* address limit */
        struct task_struct      *task;          /* main task structure */
        __u32                   cpu;            /* cpu */
@@ -142,7 +143,8 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
 #define TIF_SYSCALL_TRACE      4       /* syscall trace active */
 #define TIF_SYSCALL_AUDIT      5       /* syscall auditing active */
 #define TIF_SYSCALL_TRACEPOINT 6       /* syscall tracepoint instrumentation */
-#define TIF_SECCOMP            7       /* seccomp syscall filtering active */
+#define TIF_SECCOMP            8       /* seccomp syscall filtering active */
+#define TIF_NEED_RESCHED_LAZY  7
 
 #define TIF_NOHZ               12      /* in adaptive nohz mode */
 #define TIF_USING_IWMMXT       17
@@ -152,6 +154,7 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
 #define _TIF_SIGPENDING                (1 << TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED      (1 << TIF_NEED_RESCHED)
 #define _TIF_NOTIFY_RESUME     (1 << TIF_NOTIFY_RESUME)
+#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
 #define _TIF_UPROBE            (1 << TIF_UPROBE)
 #define _TIF_SYSCALL_TRACE     (1 << TIF_SYSCALL_TRACE)
 #define _TIF_SYSCALL_AUDIT     (1 << TIF_SYSCALL_AUDIT)
@@ -167,7 +170,8 @@ extern int vfp_restore_user_hwstate(struct user_vfp __user *,
  * Change these and you break ASM code in entry-common.S
  */
 #define _TIF_WORK_MASK         (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
-                                _TIF_NOTIFY_RESUME | _TIF_UPROBE)
+                                _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
+                                _TIF_NEED_RESCHED_LAZY)
 
 #endif /* __KERNEL__ */
 #endif /* __ASM_ARM_THREAD_INFO_H */
diff --git a/arch/arm/kernel/asm-offsets.c b/arch/arm/kernel/asm-offsets.c
index 871b8267d211..4dbe70de7318 100644
--- a/arch/arm/kernel/asm-offsets.c
+++ b/arch/arm/kernel/asm-offsets.c
@@ -65,6 +65,7 @@ int main(void)
   BLANK();
   DEFINE(TI_FLAGS,             offsetof(struct thread_info, flags));
   DEFINE(TI_PREEMPT,           offsetof(struct thread_info, preempt_count));
+  DEFINE(TI_PREEMPT_LAZY,      offsetof(struct thread_info, preempt_lazy_count));
   DEFINE(TI_ADDR_LIMIT,                offsetof(struct thread_info, addr_limit));
   DEFINE(TI_TASK,              offsetof(struct thread_info, task));
   DEFINE(TI_CPU,               offsetof(struct thread_info, cpu));
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 3ce377f7251f..d044cea59f54 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -215,11 +215,18 @@ ENDPROC(__dabt_svc)
 #ifdef CONFIG_PREEMPT
        get_thread_info tsk
        ldr     r8, [tsk, #TI_PREEMPT]          @ get preempt count
-       ldr     r0, [tsk, #TI_FLAGS]            @ get flags
        teq     r8, #0                          @ if preempt count != 0
+       bne     1f                              @ return from exeption
+       ldr     r0, [tsk, #TI_FLAGS]            @ get flags
+       tst     r0, #_TIF_NEED_RESCHED          @ if NEED_RESCHED is set
+       blne    svc_preempt                     @ preempt!
+
+       ldr     r8, [tsk, #TI_PREEMPT_LAZY]     @ get preempt lazy count
+       teq     r8, #0                          @ if preempt lazy count != 0
        movne   r0, #0                          @ force flags to 0
-       tst     r0, #_TIF_NEED_RESCHED
+       tst     r0, #_TIF_NEED_RESCHED_LAZY
        blne    svc_preempt
+1:
 #endif
 
        svc_exit r5, irq = 1                    @ return from exception
@@ -234,8 +241,14 @@ ENDPROC(__irq_svc)
 1:     bl      preempt_schedule_irq            @ irq en/disable is done inside
        ldr     r0, [tsk, #TI_FLAGS]            @ get new tasks TI_FLAGS
        tst     r0, #_TIF_NEED_RESCHED
+       bne     1b
+       tst     r0, #_TIF_NEED_RESCHED_LAZY
        reteq   r8                              @ go again
-       b       1b
+       ldr     r0, [tsk, #TI_PREEMPT_LAZY]     @ get preempt lazy count
+       teq     r0, #0                          @ if preempt lazy count != 0
+       beq     1b
+       ret     r8                              @ go again
+
 #endif
 
 __und_fault:
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 30a7228eaceb..c3bd6cbfce4b 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -36,7 +36,9 @@
  UNWIND(.cantunwind    )
        disable_irq_notrace                     @ disable interrupts
        ldr     r1, [tsk, #TI_FLAGS]            @ re-check for syscall tracing
-       tst     r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK
+       tst     r1, #((_TIF_SYSCALL_WORK | _TIF_WORK_MASK) & ~_TIF_SECCOMP)
+       bne     fast_work_pending
+       tst     r1, #_TIF_SECCOMP
        bne     fast_work_pending
 
        /* perform architecture specific actions before user return */
@@ -62,8 +64,11 @@ ENDPROC(ret_fast_syscall)
        str     r0, [sp, #S_R0 + S_OFF]!        @ save returned r0
        disable_irq_notrace                     @ disable interrupts
        ldr     r1, [tsk, #TI_FLAGS]            @ re-check for syscall tracing
-       tst     r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK
+       tst     r1, #((_TIF_SYSCALL_WORK | _TIF_WORK_MASK) & ~_TIF_SECCOMP)
+       bne     do_slower_path
+       tst     r1, #_TIF_SECCOMP
        beq     no_work_pending
+do_slower_path:
  UNWIND(.fnend         )
 ENDPROC(ret_fast_syscall)
 
diff --git a/arch/arm/kernel/patch.c b/arch/arm/kernel/patch.c
index 69bda1a5707e..1f665acaa6a9 100644
--- a/arch/arm/kernel/patch.c
+++ b/arch/arm/kernel/patch.c
@@ -15,7 +15,7 @@ struct patch {
        unsigned int insn;
 };
 
-static DEFINE_SPINLOCK(patch_lock);
+static DEFINE_RAW_SPINLOCK(patch_lock);
 
 static void __kprobes *patch_map(void *addr, int fixmap, unsigned long *flags)
        __acquires(&patch_lock)
@@ -32,7 +32,7 @@ static void __kprobes *patch_map(void *addr, int fixmap, unsigned long *flags)
                return addr;
 
        if (flags)
-               spin_lock_irqsave(&patch_lock, *flags);
+               raw_spin_lock_irqsave(&patch_lock, *flags);
        else
                __acquire(&patch_lock);
 
@@ -47,7 +47,7 @@ static void __kprobes patch_unmap(int fixmap, unsigned long *flags)
        clear_fixmap(fixmap);
 
        if (flags)
-               spin_unlock_irqrestore(&patch_lock, *flags);
+               raw_spin_unlock_irqrestore(&patch_lock, *flags);
        else
                __release(&patch_lock);
 }
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 4adfb46e3ee9..15f1d94b47c5 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -319,6 +319,30 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
 }
 
 #ifdef CONFIG_MMU
+/*
+ * CONFIG_SPLIT_PTLOCK_CPUS results in a page->ptl lock.  If the lock is not
+ * initialized by pgtable_page_ctor() then a coredump of the vector page will
+ * fail.
+ */
+static int __init vectors_user_mapping_init_page(void)
+{
+       struct page *page;
+       unsigned long addr = 0xffff0000;
+       pgd_t *pgd;
+       pud_t *pud;
+       pmd_t *pmd;
+
+       pgd = pgd_offset_k(addr);
+       pud = pud_offset(pgd, addr);
+       pmd = pmd_offset(pud, addr);
+       page = pmd_page(*(pmd));
+
+       pgtable_page_ctor(page);
+
+       return 0;
+}
+late_initcall(vectors_user_mapping_init_page);
+
 #ifdef CONFIG_KUSER_HELPERS
 /*
  * The vectors page is always readable from user space for the
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index 7b8f2141427b..96541e00b74a 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -572,7 +572,8 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
         */
        trace_hardirqs_off();
        do {
-               if (likely(thread_flags & _TIF_NEED_RESCHED)) {
+               if (likely(thread_flags & (_TIF_NEED_RESCHED |
+                                          _TIF_NEED_RESCHED_LAZY))) {
                        schedule();
                } else {
                        if (unlikely(!user_mode(regs)))
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index b26361355dae..e5754e3b03c4 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -230,8 +230,6 @@ int __cpu_disable(void)
        flush_cache_louis();
        local_flush_tlb_all();
 
-       clear_tasks_mm_cpumask(cpu);
-
        return 0;
 }
 
@@ -247,6 +245,9 @@ void __cpu_die(unsigned int cpu)
                pr_err("CPU%u: cpu didn't die\n", cpu);
                return;
        }
+
+       clear_tasks_mm_cpumask(cpu);
+
        pr_notice("CPU%u: shutdown\n", cpu);
 
        /*
diff --git a/arch/arm/kernel/unwind.c b/arch/arm/kernel/unwind.c
index 0bee233fef9a..314cfb232a63 100644
--- a/arch/arm/kernel/unwind.c
+++ b/arch/arm/kernel/unwind.c
@@ -93,7 +93,7 @@ extern const struct unwind_idx __start_unwind_idx[];
 static const struct unwind_idx *__origin_unwind_idx;
 extern const struct unwind_idx __stop_unwind_idx[];
 
-static DEFINE_SPINLOCK(unwind_lock);
+static DEFINE_RAW_SPINLOCK(unwind_lock);
 static LIST_HEAD(unwind_tables);
 
 /* Convert a prel31 symbol to an absolute address */
@@ -201,7 +201,7 @@ static const struct unwind_idx *unwind_find_idx(unsigned long addr)
                /* module unwind tables */
                struct unwind_table *table;
 
-               spin_lock_irqsave(&unwind_lock, flags);
+               raw_spin_lock_irqsave(&unwind_lock, flags);
                list_for_each_entry(table, &unwind_tables, list) {
                        if (addr >= table->begin_addr &&
                            addr < table->end_addr) {
@@ -213,7 +213,7 @@ static const struct unwind_idx *unwind_find_idx(unsigned long addr)
                                break;
                        }
                }
-               spin_unlock_irqrestore(&unwind_lock, flags);
+               raw_spin_unlock_irqrestore(&unwind_lock, flags);
        }
 
        pr_debug("%s: idx = %p\n", __func__, idx);
@@ -529,9 +529,9 @@ struct unwind_table *unwind_table_add(unsigned long start, unsigned long size,
        tab->begin_addr = text_addr;
        tab->end_addr = text_addr + text_size;
 
-       spin_lock_irqsave(&unwind_lock, flags);
+       raw_spin_lock_irqsave(&unwind_lock, flags);
        list_add_tail(&tab->list, &unwind_tables);
-       spin_unlock_irqrestore(&unwind_lock, flags);
+       raw_spin_unlock_irqrestore(&unwind_lock, flags);
 
        return tab;
 }
@@ -543,9 +543,9 @@ void unwind_table_del(struct unwind_table *tab)
        if (!tab)
                return;
 
-       spin_lock_irqsave(&unwind_lock, flags);
+       raw_spin_lock_irqsave(&unwind_lock, flags);
        list_del(&tab->list);
-       spin_unlock_irqrestore(&unwind_lock, flags);
+       raw_spin_unlock_irqrestore(&unwind_lock, flags);
 
        kfree(tab);
 }
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index d7bef2144760..36a3e51492f7 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -496,18 +496,18 @@ static void kvm_arm_resume_guest(struct kvm *kvm)
        struct kvm_vcpu *vcpu;
 
        kvm_for_each_vcpu(i, vcpu, kvm) {
-               wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
+               struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 
                vcpu->arch.pause = false;
-               wake_up_interruptible(wq);
+               swake_up(wq);
        }
 }
 
 static void vcpu_sleep(struct kvm_vcpu *vcpu)
 {
-       wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu);
+       struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
 
-       wait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
+       swait_event_interruptible(*wq, ((!vcpu->arch.power_off) &&
                                       (!vcpu->arch.pause)));
 }
 
@@ -566,7 +566,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
                 * involves poking the GIC, which must be done in a
                 * non-preemptible context.
                 */
-               preempt_disable();
+               migrate_disable();
                kvm_timer_flush_hwstate(vcpu);
                kvm_vgic_flush_hwstate(vcpu);
 
@@ -585,7 +585,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
                        local_irq_enable();
                        kvm_timer_sync_hwstate(vcpu);
                        kvm_vgic_sync_hwstate(vcpu);
-                       preempt_enable();
+                       migrate_enable();
                        continue;
                }
 
@@ -639,7 +639,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 
                kvm_vgic_sync_hwstate(vcpu);
 
-               preempt_enable();
+               migrate_enable();
 
                ret = handle_exit(vcpu, run, ret);
        }
diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
index 443db0c43d7c..a08d7a93aebb 100644
--- a/arch/arm/kvm/psci.c
+++ b/arch/arm/kvm/psci.c
@@ -70,7 +70,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
 {
        struct kvm *kvm = source_vcpu->kvm;
        struct kvm_vcpu *vcpu = NULL;
-       wait_queue_head_t *wq;
+       struct swait_queue_head *wq;
        unsigned long cpu_id;
        unsigned long context_id;
        phys_addr_t target_pc;
@@ -119,7 +119,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
        smp_mb();               /* Make sure the above is visible */
 
        wq = kvm_arch_vcpu_wq(vcpu);
-       wake_up_interruptible(wq);
+       swake_up(wq);
 
        return PSCI_RET_SUCCESS;
 }
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 28656c2b54a0..3f501305ca26 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -99,6 +99,7 @@ config HAVE_AT91_USB_CLK
 config COMMON_CLK_AT91
        bool
        select COMMON_CLK
+       select MFD_SYSCON
 
 config HAVE_AT91_SMD
        bool
diff --git a/arch/arm/mach-at91/at91rm9200.c b/arch/arm/mach-at91/at91rm9200.c
index c1a7c6cc00e1..63b4fa25b48a 100644
--- a/arch/arm/mach-at91/at91rm9200.c
+++ b/arch/arm/mach-at91/at91rm9200.c
@@ -12,7 +12,6 @@
 #include <linux/of_platform.h>
 
 #include <asm/mach/arch.h>
-#include <asm/system_misc.h>
 
 #include "generic.h"
 #include "soc.h"
@@ -33,7 +32,6 @@ static void __init at91rm9200_dt_device_init(void)
 
        of_platform_populate(NULL, of_default_bus_match_table, NULL, soc_dev);
 
-       arm_pm_idle = at91rm9200_idle;
        at91rm9200_pm_init();
 }
 
diff --git a/arch/arm/mach-at91/at91sam9.c b/arch/arm/mach-at91/at91sam9.c
index 7eb64f763034..cada2a6412b3 100644
--- a/arch/arm/mach-at91/at91sam9.c
+++ b/arch/arm/mach-at91/at91sam9.c
@@ -62,8 +62,6 @@ static void __init at91sam9_common_init(void)
                soc_dev = soc_device_to_device(soc);
 
        of_platform_populate(NULL, of_default_bus_match_table, NULL, soc_dev);
-
-       arm_pm_idle = at91sam9_idle;
 }
 
 static void __init at91sam9_dt_device_init(void)
diff --git a/arch/arm/mach-at91/generic.h b/arch/arm/mach-at91/generic.h
index b0fa7dc7286d..28ca57a2060f 100644
--- a/arch/arm/mach-at91/generic.h
+++ b/arch/arm/mach-at91/generic.h
@@ -11,27 +11,18 @@
 #ifndef _AT91_GENERIC_H
 #define _AT91_GENERIC_H
 
-#include <linux/of.h>
-#include <linux/reboot.h>
-
- /* Map io */
-extern void __init at91_map_io(void);
-extern void __init at91_alt_map_io(void);
-
-/* idle */
-extern void at91rm9200_idle(void);
-extern void at91sam9_idle(void);
-
 #ifdef CONFIG_PM
 extern void __init at91rm9200_pm_init(void);
 extern void __init at91sam9260_pm_init(void);
 extern void __init at91sam9g45_pm_init(void);
 extern void __init at91sam9x5_pm_init(void);
+extern void __init sama5_pm_init(void);
 #else
 static inline void __init at91rm9200_pm_init(void) { }
 static inline void __init at91sam9260_pm_init(void) { }
 static inline void __init at91sam9g45_pm_init(void) { }
 static inline void __init at91sam9x5_pm_init(void) { }
+static inline void __init sama5_pm_init(void) { }
 #endif
 
 #endif /* _AT91_GENERIC_H */
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 84eefbc2b4f9..bff0d062bf68 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -31,10 +31,13 @@
 #include <asm/mach/irq.h>
 #include <asm/fncpy.h>
 #include <asm/cacheflush.h>
+#include <asm/system_misc.h>
 
 #include "generic.h"
 #include "pm.h"
 
+static void __iomem *pmc;
+
 /*
  * FIXME: this is needed to communicate between the pinctrl driver and
  * the PM implementation in the machine. Possibly part of the PM
@@ -87,7 +90,7 @@ static int at91_pm_verify_clocks(void)
        unsigned long scsr;
        int i;
 
-       scsr = at91_pmc_read(AT91_PMC_SCSR);
+       scsr = readl(pmc + AT91_PMC_SCSR);
 
        /* USB must not be using PLLB */
        if ((scsr & at91_pm_data.uhp_udp_mask) != 0) {
@@ -101,8 +104,7 @@ static int at91_pm_verify_clocks(void)
 
                if ((scsr & (AT91_PMC_PCK0 << i)) == 0)
                        continue;
-
-               css = at91_pmc_read(AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
+               css = readl(pmc + AT91_PMC_PCKR(i)) & AT91_PMC_CSS;
                if (css != AT91_PMC_CSS_SLOW) {
                        pr_err("AT91: PM - Suspend-to-RAM with PCK%d src %d\n", i, css);
                        return 0;
@@ -145,8 +147,8 @@ static void at91_pm_suspend(suspend_state_t state)
        flush_cache_all();
        outer_disable();
 
-       at91_suspend_sram_fn(at91_pmc_base, at91_ramc_base[0],
-                               at91_ramc_base[1], pm_data);
+       at91_suspend_sram_fn(pmc, at91_ramc_base[0],
+                            at91_ramc_base[1], pm_data);
 
        outer_resume();
 }
@@ -369,6 +371,21 @@ static __init void at91_dt_ramc(void)
        at91_pm_set_standby(standby);
 }
 
+void at91rm9200_idle(void)
+{
+       /*
+        * Disable the processor clock.  The processor will be automatically
+        * re-enabled by an interrupt or by a reset.
+        */
+       writel(AT91_PMC_PCK, pmc + AT91_PMC_SCDR);
+}
+
+void at91sam9_idle(void)
+{
+       writel(AT91_PMC_PCK, pmc + AT91_PMC_SCDR);
+       cpu_do_idle();
+}
+
 static void __init at91_pm_sram_init(void)
 {
        struct gen_pool *sram_pool;
@@ -415,13 +432,36 @@ static void __init at91_pm_sram_init(void)
                        &at91_pm_suspend_in_sram, at91_pm_suspend_in_sram_sz);
 }
 
-static void __init at91_pm_init(void)
+static const struct of_device_id atmel_pmc_ids[] __initconst = {
+       { .compatible = "atmel,at91rm9200-pmc"  },
+       { .compatible = "atmel,at91sam9260-pmc" },
+       { .compatible = "atmel,at91sam9g45-pmc" },
+       { .compatible = "atmel,at91sam9n12-pmc" },
+       { .compatible = "atmel,at91sam9x5-pmc" },
+       { .compatible = "atmel,sama5d3-pmc" },
+       { .compatible = "atmel,sama5d2-pmc" },
+       { /* sentinel */ },
+};
+
+static void __init at91_pm_init(void (*pm_idle)(void))
 {
-       at91_pm_sram_init();
+       struct device_node *pmc_np;
 
        if (at91_cpuidle_device.dev.platform_data)
                platform_device_register(&at91_cpuidle_device);
 
+       pmc_np = of_find_matching_node(NULL, atmel_pmc_ids);
+       pmc = of_iomap(pmc_np, 0);
+       if (!pmc) {
+               pr_err("AT91: PM not supported, PMC not found\n");
+               return;
+       }
+
+       if (pm_idle)
+               arm_pm_idle = pm_idle;
+
+       at91_pm_sram_init();
+
        if (at91_suspend_sram_fn)
                suspend_set_ops(&at91_pm_ops);
        else
@@ -440,7 +480,7 @@ void __init at91rm9200_pm_init(void)
        at91_pm_data.uhp_udp_mask = AT91RM9200_PMC_UHP | AT91RM9200_PMC_UDP;
        at91_pm_data.memctrl = AT91_MEMCTRL_MC;
 
-       at91_pm_init();
+       at91_pm_init(at91rm9200_idle);
 }
 
 void __init at91sam9260_pm_init(void)
@@ -448,7 +488,7 @@ void __init at91sam9260_pm_init(void)
        at91_dt_ramc();
        at91_pm_data.memctrl = AT91_MEMCTRL_SDRAMC;
        at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP;
-       return at91_pm_init();
+       at91_pm_init(at91sam9_idle);
 }
 
 void __init at91sam9g45_pm_init(void)
@@ -456,7 +496,7 @@ void __init at91sam9g45_pm_init(void)
        at91_dt_ramc();
        at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP;
        at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
-       return at91_pm_init();
+       at91_pm_init(at91sam9_idle);
 }
 
 void __init at91sam9x5_pm_init(void)
@@ -464,5 +504,13 @@ void __init at91sam9x5_pm_init(void)
        at91_dt_ramc();
        at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP;
        at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
-       return at91_pm_init();
+       at91_pm_init(at91sam9_idle);
+}
+
+void __init sama5_pm_init(void)
+{
+       at91_dt_ramc();
+       at91_pm_data.uhp_udp_mask = AT91SAM926x_PMC_UHP | AT91SAM926x_PMC_UDP;
+       at91_pm_data.memctrl = AT91_MEMCTRL_DDRSDR;
+       at91_pm_init(NULL);
 }
diff --git a/arch/arm/mach-at91/sama5.c b/arch/arm/mach-at91/sama5.c
index d9cf6799aec0..df8fdf1cf66d 100644
--- a/arch/arm/mach-at91/sama5.c
+++ b/arch/arm/mach-at91/sama5.c
@@ -51,7 +51,7 @@ static void __init sama5_dt_device_init(void)
                soc_dev = soc_device_to_device(soc);
 
        of_platform_populate(NULL, of_default_bus_match_table, NULL, soc_dev);
-       at91sam9x5_pm_init();
+       sama5_pm_init();
 }
 
 static const char *const sama5_dt_board_compat[] __initconst = {
diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c
index 98a2c0cbb833..310dce500d3e 100644
--- a/arch/arm/mach-exynos/platsmp.c
+++ b/arch/arm/mach-exynos/platsmp.c
@@ -230,7 +230,7 @@ static void __iomem *scu_base_addr(void)
        return (void __iomem *)(S5P_VA_SCU);
 }
 
-static DEFINE_SPINLOCK(boot_lock);
+static DEFINE_RAW_SPINLOCK(boot_lock);
 
 static void exynos_secondary_init(unsigned int cpu)
 {
@@ -243,8 +243,8 @@ static void exynos_secondary_init(unsigned int cpu)
        /*
         * Synchronise with the boot thread.
         */
-       spin_lock(&boot_lock);
-       spin_unlock(&boot_lock);
+       raw_spin_lock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 }
 
 int exynos_set_boot_addr(u32 core_id, unsigned long boot_addr)
@@ -308,7 +308,7 @@ static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle)
         * Set synchronisation state between this boot processor
         * and the secondary one
         */
-       spin_lock(&boot_lock);
+       raw_spin_lock(&boot_lock);
 
        /*
         * The secondary processor is waiting to be released from
@@ -335,7 +335,7 @@ static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle)
 
                if (timeout == 0) {
                        printk(KERN_ERR "cpu1 power enable failed");
-                       spin_unlock(&boot_lock);
+                       raw_spin_unlock(&boot_lock);
                        return -ETIMEDOUT;
                }
        }
@@ -381,7 +381,7 @@ static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle)
         * calibrations, then wait for it to finish
         */
 fail:
-       spin_unlock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 
        return pen_release != -1 ? ret : 0;
 }
diff --git a/arch/arm/mach-hisi/platmcpm.c b/arch/arm/mach-hisi/platmcpm.c
index b5f8f5ffda79..9753a84df9c4 100644
--- a/arch/arm/mach-hisi/platmcpm.c
+++ b/arch/arm/mach-hisi/platmcpm.c
@@ -61,7 +61,7 @@
 
 static void __iomem *sysctrl, *fabric;
 static int hip04_cpu_table[HIP04_MAX_CLUSTERS][HIP04_MAX_CPUS_PER_CLUSTER];
-static DEFINE_SPINLOCK(boot_lock);
+static DEFINE_RAW_SPINLOCK(boot_lock);
 static u32 fabric_phys_addr;
 /*
  * [0]: bootwrapper physical address
@@ -113,7 +113,7 @@ static int hip04_boot_secondary(unsigned int l_cpu, struct task_struct *idle)
        if (cluster >= HIP04_MAX_CLUSTERS || cpu >= HIP04_MAX_CPUS_PER_CLUSTER)
                return -EINVAL;
 
-       spin_lock_irq(&boot_lock);
+       raw_spin_lock_irq(&boot_lock);
 
        if (hip04_cpu_table[cluster][cpu])
                goto out;
@@ -147,7 +147,7 @@ static int hip04_boot_secondary(unsigned int l_cpu, struct task_struct *idle)
 
 out:
        hip04_cpu_table[cluster][cpu]++;
-       spin_unlock_irq(&boot_lock);
+       raw_spin_unlock_irq(&boot_lock);
 
        return 0;
 }
@@ -162,11 +162,11 @@ static void hip04_cpu_die(unsigned int l_cpu)
        cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
        cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
 
-       spin_lock(&boot_lock);
+       raw_spin_lock(&boot_lock);
        hip04_cpu_table[cluster][cpu]--;
        if (hip04_cpu_table[cluster][cpu] == 1) {
                /* A power_up request went ahead of us. */
-               spin_unlock(&boot_lock);
+               raw_spin_unlock(&boot_lock);
                return;
        } else if (hip04_cpu_table[cluster][cpu] > 1) {
                pr_err("Cluster %d CPU%d boots multiple times\n", cluster, cpu);
@@ -174,7 +174,7 @@ static void hip04_cpu_die(unsigned int l_cpu)
        }
 
        last_man = hip04_cluster_is_down(cluster);
-       spin_unlock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
        if (last_man) {
                /* Since it's Cortex A15, disable L2 prefetching. */
                asm volatile(
@@ -203,7 +203,7 @@ static int hip04_cpu_kill(unsigned int l_cpu)
               cpu >= HIP04_MAX_CPUS_PER_CLUSTER);
 
        count = TIMEOUT_MSEC / POLL_MSEC;
-       spin_lock_irq(&boot_lock);
+       raw_spin_lock_irq(&boot_lock);
        for (tries = 0; tries < count; tries++) {
                if (hip04_cpu_table[cluster][cpu])
                        goto err;
@@ -211,10 +211,10 @@ static int hip04_cpu_kill(unsigned int l_cpu)
                data = readl_relaxed(sysctrl + SC_CPU_RESET_STATUS(cluster));
                if (data & CORE_WFI_STATUS(cpu))
                        break;
-               spin_unlock_irq(&boot_lock);
+               raw_spin_unlock_irq(&boot_lock);
                /* Wait for clean L2 when the whole cluster is down. */
                msleep(POLL_MSEC);
-               spin_lock_irq(&boot_lock);
+               raw_spin_lock_irq(&boot_lock);
        }
        if (tries >= count)
                goto err;
@@ -231,10 +231,10 @@ static int hip04_cpu_kill(unsigned int l_cpu)
                goto err;
        if (hip04_cluster_is_down(cluster))
                hip04_set_snoop_filter(cluster, 0);
-       spin_unlock_irq(&boot_lock);
+       raw_spin_unlock_irq(&boot_lock);
        return 1;
 err:
-       spin_unlock_irq(&boot_lock);
+       raw_spin_unlock_irq(&boot_lock);
        return 0;
 }
 #endif
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 8ceda2844c4f..08bcf8fb76f2 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -524,7 +524,7 @@ config SOC_IMX6Q
        bool "i.MX6 Quad/DualLite support"
        select ARM_ERRATA_764369 if SMP
        select HAVE_ARM_SCU if SMP
-       select HAVE_ARM_TWD if SMP
+       select HAVE_ARM_TWD
        select PCI_DOMAINS if PCI
        select PINCTRL_IMX6Q
        select SOC_IMX6
diff --git a/arch/arm/mach-omap2/omap-smp.c b/arch/arm/mach-omap2/omap-smp.c
index 79e1f876d1c9..7e625c17f78e 100644
--- a/arch/arm/mach-omap2/omap-smp.c
+++ b/arch/arm/mach-omap2/omap-smp.c
@@ -43,7 +43,7 @@
 /* SCU base address */
 static void __iomem *scu_base;
 
-static DEFINE_SPINLOCK(boot_lock);
+static DEFINE_RAW_SPINLOCK(boot_lock);
 
 void __iomem *omap4_get_scu_base(void)
 {
@@ -74,8 +74,8 @@ static void omap4_secondary_init(unsigned int cpu)
        /*
         * Synchronise with the boot thread.
         */
-       spin_lock(&boot_lock);
-       spin_unlock(&boot_lock);
+       raw_spin_lock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 }
 
 static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle)
@@ -89,7 +89,7 @@ static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle)
         * Set synchronisation state between this boot processor
         * and the secondary one
         */
-       spin_lock(&boot_lock);
+       raw_spin_lock(&boot_lock);
 
        /*
         * Update the AuxCoreBoot0 with boot state for secondary core.
@@ -166,7 +166,7 @@ static int omap4_boot_secondary(unsigned int cpu, struct task_struct *idle)
         * Now the secondary core is starting up let it run its
         * calibrations, then wait for it to finish
         */
-       spin_unlock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 
        return 0;
 }
diff --git a/arch/arm/mach-prima2/platsmp.c b/arch/arm/mach-prima2/platsmp.c
index e46c91094dde..dcb3ed0c26da 100644
--- a/arch/arm/mach-prima2/platsmp.c
+++ b/arch/arm/mach-prima2/platsmp.c
@@ -22,7 +22,7 @@
 
 static void __iomem *clk_base;
 
-static DEFINE_SPINLOCK(boot_lock);
+static DEFINE_RAW_SPINLOCK(boot_lock);
 
 static void sirfsoc_secondary_init(unsigned int cpu)
 {
@@ -36,8 +36,8 @@ static void sirfsoc_secondary_init(unsigned int cpu)
        /*
         * Synchronise with the boot thread.
         */
-       spin_lock(&boot_lock);
-       spin_unlock(&boot_lock);
+       raw_spin_lock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 }
 
 static const struct of_device_id clk_ids[]  = {
@@ -75,7 +75,7 @@ static int sirfsoc_boot_secondary(unsigned int cpu, struct task_struct *idle)
        /* make sure write buffer is drained */
        mb();
 
-       spin_lock(&boot_lock);
+       raw_spin_lock(&boot_lock);
 
        /*
         * The secondary processor is waiting to be released from
@@ -107,7 +107,7 @@ static int sirfsoc_boot_secondary(unsigned int cpu, struct task_struct *idle)
         * now the secondary core is starting up let it run its
         * calibrations, then wait for it to finish
         */
-       spin_unlock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 
        return pen_release != -1 ? -ENOSYS : 0;
 }
diff --git a/arch/arm/mach-qcom/platsmp.c b/arch/arm/mach-qcom/platsmp.c
index 9b00123a315d..0a49fe1bc8cf 100644
--- a/arch/arm/mach-qcom/platsmp.c
+++ b/arch/arm/mach-qcom/platsmp.c
@@ -46,7 +46,7 @@
 
 extern void secondary_startup_arm(void);
 
-static DEFINE_SPINLOCK(boot_lock);
+static DEFINE_RAW_SPINLOCK(boot_lock);
 
 #ifdef CONFIG_HOTPLUG_CPU
 static void qcom_cpu_die(unsigned int cpu)
@@ -60,8 +60,8 @@ static void qcom_secondary_init(unsigned int cpu)
        /*
         * Synchronise with the boot thread.
         */
-       spin_lock(&boot_lock);
-       spin_unlock(&boot_lock);
+       raw_spin_lock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 }
 
 static int scss_release_secondary(unsigned int cpu)
@@ -284,7 +284,7 @@ static int qcom_boot_secondary(unsigned int cpu, int (*func)(unsigned int))
         * set synchronisation state between this boot processor
         * and the secondary one
         */
-       spin_lock(&boot_lock);
+       raw_spin_lock(&boot_lock);
 
        /*
         * Send the secondary CPU a soft interrupt, thereby causing
@@ -297,7 +297,7 @@ static int qcom_boot_secondary(unsigned int cpu, int (*func)(unsigned int))
         * now the secondary core is starting up let it run its
         * calibrations, then wait for it to finish
         */
-       spin_unlock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 
        return ret;
 }
diff --git a/arch/arm/mach-spear/platsmp.c b/arch/arm/mach-spear/platsmp.c
index fd4297713d67..b0553b2c2d53 100644
--- a/arch/arm/mach-spear/platsmp.c
+++ b/arch/arm/mach-spear/platsmp.c
@@ -32,7 +32,7 @@ static void write_pen_release(int val)
        sync_cache_w(&pen_release);
 }
 
-static DEFINE_SPINLOCK(boot_lock);
+static DEFINE_RAW_SPINLOCK(boot_lock);
 
 static void __iomem *scu_base = IOMEM(VA_SCU_BASE);
 
@@ -47,8 +47,8 @@ static void spear13xx_secondary_init(unsigned int cpu)
        /*
         * Synchronise with the boot thread.
         */
-       spin_lock(&boot_lock);
-       spin_unlock(&boot_lock);
+       raw_spin_lock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 }
 
 static int spear13xx_boot_secondary(unsigned int cpu, struct task_struct *idle)
@@ -59,7 +59,7 @@ static int spear13xx_boot_secondary(unsigned int cpu, struct task_struct *idle)
         * set synchronisation state between this boot processor
         * and the secondary one
         */
-       spin_lock(&boot_lock);
+       raw_spin_lock(&boot_lock);
 
        /*
         * The secondary processor is waiting to be released from
@@ -84,7 +84,7 @@ static int spear13xx_boot_secondary(unsigned int cpu, struct task_struct *idle)
         * now the secondary core is starting up let it run its
         * calibrations, then wait for it to finish
         */
-       spin_unlock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 
        return pen_release != -1 ? -ENOSYS : 0;
 }
diff --git a/arch/arm/mach-sti/platsmp.c b/arch/arm/mach-sti/platsmp.c
index c4ad6eae67fa..e830b20b212f 100644
--- a/arch/arm/mach-sti/platsmp.c
+++ b/arch/arm/mach-sti/platsmp.c
@@ -35,7 +35,7 @@ static void write_pen_release(int val)
        sync_cache_w(&pen_release);
 }
 
-static DEFINE_SPINLOCK(boot_lock);
+static DEFINE_RAW_SPINLOCK(boot_lock);
 
 static void sti_secondary_init(unsigned int cpu)
 {
@@ -48,8 +48,8 @@ static void sti_secondary_init(unsigned int cpu)
        /*
         * Synchronise with the boot thread.
         */
-       spin_lock(&boot_lock);
-       spin_unlock(&boot_lock);
+       raw_spin_lock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 }
 
 static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle)
@@ -60,7 +60,7 @@ static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle)
         * set synchronisation state between this boot processor
         * and the secondary one
         */
-       spin_lock(&boot_lock);
+       raw_spin_lock(&boot_lock);
 
        /*
         * The secondary processor is waiting to be released from
@@ -91,7 +91,7 @@ static int sti_boot_secondary(unsigned int cpu, struct task_struct *idle)
         * now the secondary core is starting up let it run its
         * calibrations, then wait for it to finish
         */
-       spin_unlock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 
        return pen_release != -1 ? -ENOSYS : 0;
 }
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index 0d20cd594017..a11dc6d8ca02 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -433,6 +433,9 @@ do_translation_fault(unsigned long addr, unsigned int fsr,
        if (addr < TASK_SIZE)
                return do_page_fault(addr, fsr, regs);
 
+       if (interrupts_enabled(regs))
+               local_irq_enable();
+
        if (user_mode(regs))
                goto bad_area;
 
@@ -500,6 +503,9 @@ do_translation_fault(unsigned long addr, unsigned int fsr,
 static int
 do_sect_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 {
+       if (interrupts_enabled(regs))
+               local_irq_enable();
+
        do_bad_area(addr, fsr, regs);
        return 0;
 }
diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c
index d02f8187b1cc..542692dbd40a 100644
--- a/arch/arm/mm/highmem.c
+++ b/arch/arm/mm/highmem.c
@@ -34,6 +34,11 @@ static inline pte_t get_fixmap_pte(unsigned long vaddr)
        return *ptep;
 }
 
+static unsigned int fixmap_idx(int type)
+{
+       return FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
+}
+
 void *kmap(struct page *page)
 {
        might_sleep();
@@ -54,12 +59,13 @@ EXPORT_SYMBOL(kunmap);
 
 void *kmap_atomic(struct page *page)
 {
+       pte_t pte = mk_pte(page, kmap_prot);
        unsigned int idx;
        unsigned long vaddr;
        void *kmap;
        int type;
 
-       preempt_disable();
+       preempt_disable_nort();
        pagefault_disable();
        if (!PageHighMem(page))
                return page_address(page);
@@ -79,7 +85,7 @@ void *kmap_atomic(struct page *page)
 
        type = kmap_atomic_idx_push();
 
-       idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
+       idx = fixmap_idx(type);
        vaddr = __fix_to_virt(idx);
 #ifdef CONFIG_DEBUG_HIGHMEM
        /*
@@ -93,7 +99,10 @@ void *kmap_atomic(struct page *page)
         * in place, so the contained TLB flush ensures the TLB is updated
         * with the new mapping.
         */
-       set_fixmap_pte(idx, mk_pte(page, kmap_prot));
+#ifdef CONFIG_PREEMPT_RT_FULL
+       current->kmap_pte[type] = pte;
+#endif
+       set_fixmap_pte(idx, pte);
 
        return (void *)vaddr;
 }
@@ -106,44 +115,75 @@ void __kunmap_atomic(void *kvaddr)
 
        if (kvaddr >= (void *)FIXADDR_START) {
                type = kmap_atomic_idx();
-               idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
+               idx = fixmap_idx(type);
 
                if (cache_is_vivt())
                        __cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
+#ifdef CONFIG_PREEMPT_RT_FULL
+               current->kmap_pte[type] = __pte(0);
+#endif
 #ifdef CONFIG_DEBUG_HIGHMEM
                BUG_ON(vaddr != __fix_to_virt(idx));
-               set_fixmap_pte(idx, __pte(0));
 #else
                (void) idx;  /* to kill a warning */
 #endif
+               set_fixmap_pte(idx, __pte(0));
                kmap_atomic_idx_pop();
        } else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) {
                /* this address was obtained through kmap_high_get() */
                kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)]));
        }
        pagefault_enable();
-       preempt_enable();
+       preempt_enable_nort();
 }
 EXPORT_SYMBOL(__kunmap_atomic);
 
 void *kmap_atomic_pfn(unsigned long pfn)
 {
+       pte_t pte = pfn_pte(pfn, kmap_prot);
        unsigned long vaddr;
        int idx, type;
        struct page *page = pfn_to_page(pfn);
 
-       preempt_disable();
+       preempt_disable_nort();
        pagefault_disable();
        if (!PageHighMem(page))
                return page_address(page);
 
        type = kmap_atomic_idx_push();
-       idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
+       idx = fixmap_idx(type);
        vaddr = __fix_to_virt(idx);
 #ifdef CONFIG_DEBUG_HIGHMEM
        BUG_ON(!pte_none(get_fixmap_pte(vaddr)));
 #endif
-       set_fixmap_pte(idx, pfn_pte(pfn, kmap_prot));
+#ifdef CONFIG_PREEMPT_RT_FULL
+       current->kmap_pte[type] = pte;
+#endif
+       set_fixmap_pte(idx, pte);
 
        return (void *)vaddr;
 }
+#if defined CONFIG_PREEMPT_RT_FULL
+void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p)
+{
+       int i;
+
+       /*
+        * Clear @prev's kmap_atomic mappings
+        */
+       for (i = 0; i < prev_p->kmap_idx; i++) {
+               int idx = fixmap_idx(i);
+
+               set_fixmap_pte(idx, __pte(0));
+       }
+       /*
+        * Restore @next_p's kmap_atomic mappings
+        */
+       for (i = 0; i < next_p->kmap_idx; i++) {
+               int idx = fixmap_idx(i);
+
+               if (!pte_none(next_p->kmap_pte[i]))
+                       set_fixmap_pte(idx, next_p->kmap_pte[i]);
+       }
+}
+#endif
diff --git a/arch/arm/plat-versatile/platsmp.c b/arch/arm/plat-versatile/platsmp.c
index 53feb90c840c..b4a8d54fc3f3 100644
--- a/arch/arm/plat-versatile/platsmp.c
+++ b/arch/arm/plat-versatile/platsmp.c
@@ -30,7 +30,7 @@ static void write_pen_release(int val)
        sync_cache_w(&pen_release);
 }
 
-static DEFINE_SPINLOCK(boot_lock);
+static DEFINE_RAW_SPINLOCK(boot_lock);
 
 void versatile_secondary_init(unsigned int cpu)
 {
@@ -43,8 +43,8 @@ void versatile_secondary_init(unsigned int cpu)
        /*
         * Synchronise with the boot thread.
         */
-       spin_lock(&boot_lock);
-       spin_unlock(&boot_lock);
+       raw_spin_lock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 }
 
 int versatile_boot_secondary(unsigned int cpu, struct task_struct *idle)
@@ -55,7 +55,7 @@ int versatile_boot_secondary(unsigned int cpu, struct task_struct *idle)
         * Set synchronisation state between this boot processor
         * and the secondary one
         */
-       spin_lock(&boot_lock);
+       raw_spin_lock(&boot_lock);
 
        /*
         * This is really belt and braces; we hold unintended secondary
@@ -85,7 +85,7 @@ int versatile_boot_secondary(unsigned int cpu, struct task_struct *idle)
         * now the secondary core is starting up let it run its
         * calibrations, then wait for it to finish
         */
-       spin_unlock(&boot_lock);
+       raw_spin_unlock(&boot_lock);
 
        return pen_release != -1 ? -ENOSYS : 0;
 }
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 14cdc6dea493..9196cf82f7be 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -76,6 +76,7 @@ config ARM64
        select HAVE_PERF_REGS
        select HAVE_PERF_USER_STACK_DUMP
        select HAVE_RCU_TABLE_FREE
+       select HAVE_PREEMPT_LAZY
        select HAVE_SYSCALL_TRACEPOINTS
        select IOMMU_DMA if IOMMU_SUPPORT
        select IRQ_DOMAIN
@@ -582,7 +583,7 @@ config XEN_DOM0
 
 config XEN
        bool "Xen guest support on ARM64"
-       depends on ARM64 && OF
+       depends on ARM64 && OF && !PREEMPT_RT_FULL
        select SWIOTLB_XEN
        help
          Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index 90c7ff233735..5f4e89fbc290 100644
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -49,6 +49,7 @@ struct thread_info {
        mm_segment_t            addr_limit;     /* address limit */
        struct task_struct      *task;          /* main task structure */
        int                     preempt_count;  /* 0 => preemptable, <0 => bug */
+       int                     preempt_lazy_count; /* 0 => preemptable, <0 => bug */
        int                     cpu;            /* cpu */
 };
 
@@ -103,6 +104,7 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_NEED_RESCHED       1
 #define TIF_NOTIFY_RESUME      2       /* callback before returning to user */
 #define TIF_FOREIGN_FPSTATE    3       /* CPU's FP state is not current's */
+#define TIF_NEED_RESCHED_LAZY  4
 #define TIF_NOHZ               7
 #define TIF_SYSCALL_TRACE      8
 #define TIF_SYSCALL_AUDIT      9
@@ -118,6 +120,7 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_NEED_RESCHED      (1 << TIF_NEED_RESCHED)
 #define _TIF_NOTIFY_RESUME     (1 << TIF_NOTIFY_RESUME)
 #define _TIF_FOREIGN_FPSTATE   (1 << TIF_FOREIGN_FPSTATE)
+#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
 #define _TIF_NOHZ              (1 << TIF_NOHZ)
 #define _TIF_SYSCALL_TRACE     (1 << TIF_SYSCALL_TRACE)
 #define _TIF_SYSCALL_AUDIT     (1 << TIF_SYSCALL_AUDIT)
@@ -126,7 +129,8 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_32BIT             (1 << TIF_32BIT)
 
 #define _TIF_WORK_MASK         (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
-                                _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE)
+                                _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \
+                                _TIF_NEED_RESCHED_LAZY)
 
 #define _TIF_SYSCALL_WORK      (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
                                 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c
index 087cf9a65359..d74475928399 100644
--- a/arch/arm64/kernel/asm-offsets.c
+++ b/arch/arm64/kernel/asm-offsets.c
@@ -35,6 +35,7 @@ int main(void)
   BLANK();
   DEFINE(TI_FLAGS,             offsetof(struct thread_info, flags));
   DEFINE(TI_PREEMPT,           offsetof(struct thread_info, preempt_count));
+  DEFINE(TI_PREEMPT_LAZY,      offsetof(struct thread_info, preempt_lazy_count));
   DEFINE(TI_ADDR_LIMIT,                offsetof(struct thread_info, addr_limit));
   DEFINE(TI_TASK,              offsetof(struct thread_info, task));
   DEFINE(TI_CPU,               offsetof(struct thread_info, cpu));
diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index dccd0c2e9023..a8d4d065fd81 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -378,11 +378,16 @@ ENDPROC(el1_sync)
 #ifdef CONFIG_PREEMPT
        get_thread_info tsk
        ldr     w24, [tsk, #TI_PREEMPT]         // get preempt count
-       cbnz    w24, 1f                         // preempt count != 0
+       cbnz    w24, 2f                         // preempt count != 0
        ldr     x0, [tsk, #TI_FLAGS]            // get flags
-       tbz     x0, #TIF_NEED_RESCHED, 1f       // needs rescheduling?
-       bl      el1_preempt
+       tbnz    x0, #TIF_NEED_RESCHED, 1f       // needs rescheduling?
+
+       ldr     w24, [tsk, #TI_PREEMPT_LAZY]    // get preempt lazy count
+       cbnz    w24, 2f                         // preempt lazy count != 0
+       tbz     x0, #TIF_NEED_RESCHED_LAZY, 2f  // needs rescheduling?
 1:
+       bl      el1_preempt
+2:
 #endif
 #ifdef CONFIG_TRACE_IRQFLAGS
        bl      trace_hardirqs_on
@@ -396,6 +401,7 @@ ENDPROC(el1_irq)
 1:     bl      preempt_schedule_irq            // irq en/disable is done inside
        ldr     x0, [tsk, #TI_FLAGS]            // get new tasks TI_FLAGS
        tbnz    x0, #TIF_NEED_RESCHED, 1b       // needs rescheduling?
+       tbnz    x0, #TIF_NEED_RESCHED_LAZY, 1b  // needs rescheduling?
        ret     x24
 #endif
 
@@ -640,6 +646,7 @@ ENDPROC(cpu_switch_to)
  */
 work_pending:
        tbnz    x1, #TIF_NEED_RESCHED, work_resched
+       tbnz    x1, #TIF_NEED_RESCHED_LAZY, work_resched
        /* TIF_SIGPENDING, TIF_NOTIFY_RESUME or TIF_FOREIGN_FPSTATE case */
        ldr     x2, [sp, #S_PSTATE]
        mov     x0, sp                          // 'regs'
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 8b0424abc84c..5422d4c0bbdf 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2411,7 +2411,7 @@ config CPU_R4400_WORKAROUNDS
 #
 config HIGHMEM
        bool "High Memory Support"
-       depends on 32BIT && CPU_SUPPORTS_HIGHMEM && SYS_SUPPORTS_HIGHMEM && !CPU_MIPS32_3_5_EVA
+       depends on 32BIT && CPU_SUPPORTS_HIGHMEM && SYS_SUPPORTS_HIGHMEM && !CPU_MIPS32_3_5_EVA && !PREEMPT_RT_FULL
 
 config CPU_SUPPORTS_HIGHMEM
        bool
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index a017b23ee4aa..8d4d9270140f 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -454,8 +454,8 @@ int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
 
        dvcpu->arch.wait = 0;
 
-       if (waitqueue_active(&dvcpu->wq))
-               wake_up_interruptible(&dvcpu->wq);
+       if (swait_active(&dvcpu->wq))
+               swake_up(&dvcpu->wq);
 
        return 0;
 }
@@ -1183,8 +1183,8 @@ static void kvm_mips_comparecount_func(unsigned long data)
        kvm_mips_callbacks->queue_timer_int(vcpu);
 
        vcpu->arch.wait = 0;
-       if (waitqueue_active(&vcpu->wq))
-               wake_up_interruptible(&vcpu->wq);
+       if (swait_active(&vcpu->wq))
+               swake_up(&vcpu->wq);
 }
 
 /* low level hrtimer wake routine */
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index dfb1ee8c3e06..cdc3c20ef225 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -60,10 +60,11 @@ config LOCKDEP_SUPPORT
 
 config RWSEM_GENERIC_SPINLOCK
        bool
+       default y if PREEMPT_RT_FULL
 
 config RWSEM_XCHGADD_ALGORITHM
        bool
-       default y
+       default y if !PREEMPT_RT_FULL
 
 config GENERIC_LOCKBREAK
        bool
@@ -141,6 +142,7 @@ config PPC
        select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
        select GENERIC_STRNCPY_FROM_USER
        select GENERIC_STRNLEN_USER
+       select HAVE_PREEMPT_LAZY
        select HAVE_MOD_ARCH_SPECIFIC
        select MODULES_USE_ELF_RELA
        select CLONE_BACKWARDS
@@ -319,7 +321,7 @@ menu "Kernel options"
 
 config HIGHMEM
        bool "High memory support"
-       depends on PPC32
+       depends on PPC32 && !PREEMPT_RT_FULL
 
 source kernel/Kconfig.hz
 source kernel/Kconfig.preempt
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index a92d95aee42d..20376580583f 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -286,7 +286,7 @@ struct kvmppc_vcore {
        struct list_head runnable_threads;
        struct list_head preempt_list;
        spinlock_t lock;
-       wait_queue_head_t wq;
+       struct swait_queue_head wq;
        spinlock_t stoltb_lock; /* protects stolen_tb and preempt_tb */
        u64 stolen_tb;
        u64 preempt_tb;
@@ -627,7 +627,7 @@ struct kvm_vcpu_arch {
        u8 prodded;
        u32 last_inst;
 
-       wait_queue_head_t *wqp;
+       struct swait_queue_head *wqp;
        struct kvmppc_vcore *vcore;
        int ret;
        int trap;
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index 7efee4a3240b..40e6fa1b85b2 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -42,6 +42,8 @@ struct thread_info {
        int             cpu;                    /* cpu we're on */
        int             preempt_count;          /* 0 => preemptable,
                                                   <0 => BUG */
+       int             preempt_lazy_count;      /* 0 => preemptable,
+                                                  <0 => BUG */
        unsigned long   local_flags;            /* private flags for thread */
 
        /* low level flags - has atomic operations done on it */
@@ -82,8 +84,7 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_SYSCALL_TRACE      0       /* syscall trace active */
 #define TIF_SIGPENDING         1       /* signal pending */
 #define TIF_NEED_RESCHED       2       /* rescheduling necessary */
-#define TIF_POLLING_NRFLAG     3       /* true if poll_idle() is polling
-                                          TIF_NEED_RESCHED */
+#define TIF_NEED_RESCHED_LAZY  3       /* lazy rescheduling necessary */
 #define TIF_32BIT              4       /* 32 bit binary */
 #define TIF_RESTORE_TM         5       /* need to restore TM FP/VEC/VSX */
 #define TIF_SYSCALL_AUDIT      7       /* syscall auditing active */
@@ -101,6 +102,8 @@ static inline struct thread_info *current_thread_info(void)
 #if defined(CONFIG_PPC64)
 #define TIF_ELF2ABI            18      /* function descriptors must die! */
 #endif
+#define TIF_POLLING_NRFLAG     19      /* true if poll_idle() is polling
+                                          TIF_NEED_RESCHED */
 
 /* as above, but as bit values */
 #define _TIF_SYSCALL_TRACE     (1<<TIF_SYSCALL_TRACE)
@@ -119,14 +122,16 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SYSCALL_TRACEPOINT        (1<<TIF_SYSCALL_TRACEPOINT)
 #define _TIF_EMULATE_STACK_STORE       (1<<TIF_EMULATE_STACK_STORE)
 #define _TIF_NOHZ              (1<<TIF_NOHZ)
+#define _TIF_NEED_RESCHED_LAZY (1<<TIF_NEED_RESCHED_LAZY)
 #define _TIF_SYSCALL_DOTRACE   (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
                                 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
                                 _TIF_NOHZ)
 
 #define _TIF_USER_WORK_MASK    (_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
                                 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
-                                _TIF_RESTORE_TM)
+                                _TIF_RESTORE_TM | _TIF_NEED_RESCHED_LAZY)
 #define _TIF_PERSYSCALL_MASK   (_TIF_RESTOREALL|_TIF_NOERROR)
+#define _TIF_NEED_RESCHED_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)
 
 /* Bits in local_flags */
 /* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 40da69163d51..bd040815334b 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -160,6 +160,7 @@ int main(void)
        DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
        DEFINE(TI_LOCAL_FLAGS, offsetof(struct thread_info, local_flags));
        DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
+       DEFINE(TI_PREEMPT_LAZY, offsetof(struct thread_info, preempt_lazy_count));
        DEFINE(TI_TASK, offsetof(struct thread_info, task));
        DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
 
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 2405631e91a2..c21b4b42eaa0 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -818,7 +818,14 @@ user_exc_return:           /* r10 contains MSR_KERNEL here */
        cmpwi   0,r0,0          /* if non-zero, just restore regs and return */
        bne     restore
        andi.   r8,r8,_TIF_NEED_RESCHED
+       bne+    1f
+       lwz     r0,TI_PREEMPT_LAZY(r9)
+       cmpwi   0,r0,0          /* if non-zero, just restore regs and return */
+       bne     restore
+       lwz     r0,TI_FLAGS(r9)
+       andi.   r0,r0,_TIF_NEED_RESCHED_LAZY
        beq+    restore
+1:
        lwz     r3,_MSR(r1)
        andi.   r0,r3,MSR_EE    /* interrupts off? */
        beq     restore         /* don't schedule if so */
@@ -829,11 +836,11 @@ user_exc_return:          /* r10 contains MSR_KERNEL here */
         */
        bl      trace_hardirqs_off
 #endif
-1:     bl      preempt_schedule_irq
+2:     bl      preempt_schedule_irq
        CURRENT_THREAD_INFO(r9, r1)
        lwz     r3,TI_FLAGS(r9)
-       andi.   r0,r3,_TIF_NEED_RESCHED
-       bne-    1b
+       andi.   r0,r3,_TIF_NEED_RESCHED_MASK
+       bne-    2b
 #ifdef CONFIG_TRACE_IRQFLAGS
        /* And now, to properly rebalance the above, we tell lockdep they
         * are being turned back on, which will happen when we return
@@ -1154,7 +1161,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX)
 #endif /* !(CONFIG_4xx || CONFIG_BOOKE) */
 
 do_work:                       /* r10 contains MSR_KERNEL here */
-       andi.   r0,r9,_TIF_NEED_RESCHED
+       andi.   r0,r9,_TIF_NEED_RESCHED_MASK
        beq     do_user_signal
 
 do_resched:                    /* r10 contains MSR_KERNEL here */
@@ -1175,7 +1182,7 @@ do_resched:                       /* r10 contains MSR_KERNEL here */
        MTMSRD(r10)             /* disable interrupts */
        CURRENT_THREAD_INFO(r9, r1)
        lwz     r9,TI_FLAGS(r9)
-       andi.   r0,r9,_TIF_NEED_RESCHED
+       andi.   r0,r9,_TIF_NEED_RESCHED_MASK
        bne-    do_resched
        andi.   r0,r9,_TIF_USER_WORK_MASK
        beq     restore_user
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index f6fd0332c3a2..96235fe0a581 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -683,7 +683,7 @@ _GLOBAL(ret_from_except_lite)
 #else
        beq     restore
 #endif
-1:     andi.   r0,r4,_TIF_NEED_RESCHED
+1:     andi.   r0,r4,_TIF_NEED_RESCHED_MASK
        beq     2f
        bl      restore_interrupts
        SCHEDULE_USER
@@ -745,10 +745,18 @@ _GLOBAL(ret_from_except_lite)
 
 #ifdef CONFIG_PREEMPT
        /* Check if we need to preempt */
+       lwz     r8,TI_PREEMPT(r9)
+       cmpwi   0,r8,0          /* if non-zero, just restore regs and return */
+       bne     restore
        andi.   r0,r4,_TIF_NEED_RESCHED
+       bne+    check_count
+
+       andi.   r0,r4,_TIF_NEED_RESCHED_LAZY
        beq+    restore
+       lwz     r8,TI_PREEMPT_LAZY(r9)
+
        /* Check that preempt_count() == 0 and interrupts are enabled */
-       lwz     r8,TI_PREEMPT(r9)
+check_count:
        cmpwi   cr1,r8,0
        ld      r0,SOFTE(r1)
        cmpdi   r0,0
@@ -765,7 +773,7 @@ _GLOBAL(ret_from_except_lite)
        /* Re-test flags and eventually loop */
        CURRENT_THREAD_INFO(r9, r1)
        ld      r4,TI_FLAGS(r9)
-       andi.   r0,r4,_TIF_NEED_RESCHED
+       andi.   r0,r4,_TIF_NEED_RESCHED_MASK
        bne     1b
 
        /*
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 290559df1e8b..070afa6da35d 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -614,6 +614,7 @@ void irq_ctx_init(void)
        }
 }
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 void do_softirq_own_stack(void)
 {
        struct thread_info *curtp, *irqtp;
@@ -631,6 +632,7 @@ void do_softirq_own_stack(void)
        if (irqtp->flags)
                set_bits(irqtp->flags, &curtp->flags);
 }
+#endif
 
 irq_hw_number_t virq_to_hw(unsigned int virq)
 {
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index df4efa304b2c..9cb0c2f6e7ac 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -40,6 +40,7 @@
  * We store the saved ksp_limit in the unused part
  * of the STACK_FRAME_OVERHEAD
  */
+#ifndef CONFIG_PREEMPT_RT_FULL
 _GLOBAL(call_do_softirq)
        mflr    r0
        stw     r0,4(r1)
@@ -56,6 +57,7 @@ _GLOBAL(call_do_softirq)
        stw     r10,THREAD+KSP_LIMIT(r2)
        mtlr    r0
        blr
+#endif
 
 /*
  * void call_do_irq(struct pt_regs *regs, struct thread_info *irqtp);
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index db475d41b57a..96b7ef80e05d 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -30,6 +30,7 @@
 
        .text
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 _GLOBAL(call_do_softirq)
        mflr    r0
        std     r0,16(r1)
@@ -40,6 +41,7 @@ _GLOBAL(call_do_softirq)
        ld      r0,16(r1)
        mtlr    r0
        blr
+#endif
 
 _GLOBAL(call_do_irq)
        mflr    r0
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index c2024ac9d4e8..2303788da7e1 100644
--- a/arch/powerpc/kvm/Kconfig
+++ b/arch/powerpc/kvm/Kconfig
@@ -172,6 +172,7 @@ config KVM_E500MC
 config KVM_MPIC
        bool "KVM in-kernel MPIC emulation"
        depends on KVM && E500
+       depends on !PREEMPT_RT_FULL
        select HAVE_KVM_IRQCHIP
        select HAVE_KVM_IRQFD
        select HAVE_KVM_IRQ_ROUTING
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 428563b195c3..4c42c3935025 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -114,11 +114,11 @@ static bool kvmppc_ipi_thread(int cpu)
 static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
 {
        int cpu;
-       wait_queue_head_t *wqp;
+       struct swait_queue_head *wqp;
 
        wqp = kvm_arch_vcpu_wq(vcpu);
-       if (waitqueue_active(wqp)) {
-               wake_up_interruptible(wqp);
+       if (swait_active(wqp)) {
+               swake_up(wqp);
                ++vcpu->stat.halt_wakeup;
        }
 
@@ -707,8 +707,8 @@ int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
                tvcpu->arch.prodded = 1;
                smp_mb();
                if (vcpu->arch.ceded) {
-                       if (waitqueue_active(&vcpu->wq)) {
-                               wake_up_interruptible(&vcpu->wq);
+                       if (swait_active(&vcpu->wq)) {
+                               swake_up(&vcpu->wq);
                                vcpu->stat.halt_wakeup++;
                        }
                }
@@ -1453,7 +1453,7 @@ static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int core)
        INIT_LIST_HEAD(&vcore->runnable_threads);
        spin_lock_init(&vcore->lock);
        spin_lock_init(&vcore->stoltb_lock);
-       init_waitqueue_head(&vcore->wq);
+       init_swait_queue_head(&vcore->wq);
        vcore->preempt_tb = TB_NIL;
        vcore->lpcr = kvm->arch.lpcr;
        vcore->first_vcpuid = core * threads_per_subcore;
@@ -2525,10 +2525,9 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
 {
        struct kvm_vcpu *vcpu;
        int do_sleep = 1;
+       DECLARE_SWAITQUEUE(wait);
 
-       DEFINE_WAIT(wait);
-
-       prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
+       prepare_to_swait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
 
        /*
         * Check one last time for pending exceptions and ceded state after
@@ -2542,7 +2541,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
        }
 
        if (!do_sleep) {
-               finish_wait(&vc->wq, &wait);
+               finish_swait(&vc->wq, &wait);
                return;
        }
 
@@ -2550,7 +2549,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
        trace_kvmppc_vcore_blocked(vc, 0);
        spin_unlock(&vc->lock);
        schedule();
-       finish_wait(&vc->wq, &wait);
+       finish_swait(&vc->wq, &wait);
        spin_lock(&vc->lock);
        vc->vcore_state = VCORE_INACTIVE;
        trace_kvmppc_vcore_blocked(vc, 1);
@@ -2606,7 +2605,7 @@ static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
                        kvmppc_start_thread(vcpu, vc);
                        trace_kvm_guest_enter(vcpu);
                } else if (vc->vcore_state == VCORE_SLEEPING) {
-                       wake_up(&vc->wq);
+                       swake_up(&vc->wq);
                }
 
        }
diff --git a/arch/powerpc/platforms/ps3/device-init.c b/arch/powerpc/platforms/ps3/device-init.c
index 3f175e8aedb4..c4c02f91904c 100644
--- a/arch/powerpc/platforms/ps3/device-init.c
+++ b/arch/powerpc/platforms/ps3/device-init.c
@@ -752,7 +752,7 @@ static int ps3_notification_read_write(struct ps3_notification_device *dev,
        }
        pr_debug("%s:%u: notification %s issued\n", __func__, __LINE__, op);
 
-       res = wait_event_interruptible(dev->done.wait,
+       res = swait_event_interruptible(dev->done.wait,
                                       dev->done.done || kthread_should_stop());
        if (kthread_should_stop())
                res = -EINTR;
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index e9a983f40a24..bbdc539fb3c6 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -427,7 +427,7 @@ struct kvm_s390_irq_payload {
 struct kvm_s390_local_interrupt {
        spinlock_t lock;
        struct kvm_s390_float_interrupt *float_int;
-       wait_queue_head_t *wq;
+       struct swait_queue_head *wq;
        atomic_t *cpuflags;
        DECLARE_BITMAP(sigp_emerg_pending, KVM_MAX_VCPUS);
        struct kvm_s390_irq_payload irq;
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 6a75352f453c..cc862c486002 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -868,13 +868,13 @@ int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
 
 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
 {
-       if (waitqueue_active(&vcpu->wq)) {
+       if (swait_active(&vcpu->wq)) {
                /*
                 * The vcpu gave up the cpu voluntarily, mark it as a good
                 * yield-candidate.
                 */
                vcpu->preempted = true;
-               wake_up_interruptible(&vcpu->wq);
+               swake_up(&vcpu->wq);
                vcpu->stat.halt_wakeup++;
        }
 }
diff --git a/arch/sh/kernel/irq.c b/arch/sh/kernel/irq.c
index 6c0378c0b8b5..abd58b4dff97 100644
--- a/arch/sh/kernel/irq.c
+++ b/arch/sh/kernel/irq.c
@@ -147,6 +147,7 @@ void irq_ctx_exit(int cpu)
        hardirq_ctx[cpu] = NULL;
 }
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 void do_softirq_own_stack(void)
 {
        struct thread_info *curctx;
@@ -174,6 +175,7 @@ void do_softirq_own_stack(void)
                  "r5", "r6", "r7", "r8", "r9", "r15", "t", "pr"
        );
 }
+#endif
 #else
 static inline void handle_one_irq(unsigned int irq)
 {
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 94f4ac21761b..d7c369d061cf 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -189,12 +189,10 @@ config NR_CPUS
 source kernel/Kconfig.hz
 
 config RWSEM_GENERIC_SPINLOCK
-       bool
-       default y if SPARC32
+       def_bool PREEMPT_RT_FULL
 
 config RWSEM_XCHGADD_ALGORITHM
-       bool
-       default y if SPARC64
+       def_bool !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT_FULL
 
 config GENERIC_HWEIGHT
        bool
diff --git a/arch/sparc/kernel/irq_64.c b/arch/sparc/kernel/irq_64.c
index bfbde8c4ffb2..62e7e06013c5 100644
--- a/arch/sparc/kernel/irq_64.c
+++ b/arch/sparc/kernel/irq_64.c
@@ -854,6 +854,7 @@ void __irq_entry handler_irq(int pil, struct pt_regs *regs)
        set_irq_regs(old_regs);
 }
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 void do_softirq_own_stack(void)
 {
        void *orig_sp, *sp = softirq_stack[smp_processor_id()];
@@ -868,6 +869,7 @@ void do_softirq_own_stack(void)
        __asm__ __volatile__("mov %0, %%sp"
                             : : "r" (orig_sp));
 }
+#endif
 
 #ifdef CONFIG_HOTPLUG_CPU
 void fixup_irqs(void)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0ef2cdd11616..2eaae0f372fa 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -17,6 +17,7 @@ config X86_64
 ### Arch settings
 config X86
        def_bool y
+       select HAVE_PREEMPT_LAZY
        select ACPI_LEGACY_TABLES_LOOKUP        if ACPI
        select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
        select ANON_INODES
@@ -213,8 +214,11 @@ config ARCH_MAY_HAVE_PC_FDC
        def_bool y
        depends on ISA_DMA_API
 
+config RWSEM_GENERIC_SPINLOCK
+       def_bool PREEMPT_RT_FULL
+
 config RWSEM_XCHGADD_ALGORITHM
-       def_bool y
+       def_bool !RWSEM_GENERIC_SPINLOCK && !PREEMPT_RT_FULL
 
 config GENERIC_CALIBRATE_DELAY
        def_bool y
@@ -849,7 +853,7 @@ config IOMMU_HELPER
 config MAXSMP
        bool "Enable Maximum number of SMP Processors and NUMA Nodes"
        depends on X86_64 && SMP && DEBUG_KERNEL
-       select CPUMASK_OFFSTACK
+       select CPUMASK_OFFSTACK if !PREEMPT_RT_FULL
        ---help---
          Enable maximum number of CPUS and NUMA Nodes for this architecture.
          If unsure, say N.
diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
index 3633ad6145c5..c6d5458ee7f9 100644
--- a/arch/x86/crypto/aesni-intel_glue.c
+++ b/arch/x86/crypto/aesni-intel_glue.c
@@ -383,14 +383,14 @@ static int ecb_encrypt(struct blkcipher_desc *desc,
        err = blkcipher_walk_virt(desc, &walk);
        desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 
-       kernel_fpu_begin();
        while ((nbytes = walk.nbytes)) {
+               kernel_fpu_begin();
                aesni_ecb_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
-                             nbytes & AES_BLOCK_MASK);
+                               nbytes & AES_BLOCK_MASK);
+               kernel_fpu_end();
                nbytes &= AES_BLOCK_SIZE - 1;
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }
-       kernel_fpu_end();
 
        return err;
 }
@@ -407,14 +407,14 @@ static int ecb_decrypt(struct blkcipher_desc *desc,
        err = blkcipher_walk_virt(desc, &walk);
        desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 
-       kernel_fpu_begin();
        while ((nbytes = walk.nbytes)) {
+               kernel_fpu_begin();
                aesni_ecb_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr,
                              nbytes & AES_BLOCK_MASK);
+               kernel_fpu_end();
                nbytes &= AES_BLOCK_SIZE - 1;
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }
-       kernel_fpu_end();
 
        return err;
 }
@@ -431,14 +431,14 @@ static int cbc_encrypt(struct blkcipher_desc *desc,
        err = blkcipher_walk_virt(desc, &walk);
        desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 
-       kernel_fpu_begin();
        while ((nbytes = walk.nbytes)) {
+               kernel_fpu_begin();
                aesni_cbc_enc(ctx, walk.dst.virt.addr, walk.src.virt.addr,
                              nbytes & AES_BLOCK_MASK, walk.iv);
+               kernel_fpu_end();
                nbytes &= AES_BLOCK_SIZE - 1;
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }
-       kernel_fpu_end();
 
        return err;
 }
@@ -455,14 +455,14 @@ static int cbc_decrypt(struct blkcipher_desc *desc,
        err = blkcipher_walk_virt(desc, &walk);
        desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 
-       kernel_fpu_begin();
        while ((nbytes = walk.nbytes)) {
+               kernel_fpu_begin();
                aesni_cbc_dec(ctx, walk.dst.virt.addr, walk.src.virt.addr,
                              nbytes & AES_BLOCK_MASK, walk.iv);
+               kernel_fpu_end();
                nbytes &= AES_BLOCK_SIZE - 1;
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }
-       kernel_fpu_end();
 
        return err;
 }
@@ -514,18 +514,20 @@ static int ctr_crypt(struct blkcipher_desc *desc,
        err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
        desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 
-       kernel_fpu_begin();
        while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
+               kernel_fpu_begin();
                aesni_ctr_enc_tfm(ctx, walk.dst.virt.addr, walk.src.virt.addr,
                                      nbytes & AES_BLOCK_MASK, walk.iv);
+               kernel_fpu_end();
                nbytes &= AES_BLOCK_SIZE - 1;
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }
        if (walk.nbytes) {
+               kernel_fpu_begin();
                ctr_crypt_final(ctx, &walk);
+               kernel_fpu_end();
                err = blkcipher_walk_done(desc, &walk, 0);
        }
-       kernel_fpu_end();
 
        return err;
 }
diff --git a/arch/x86/crypto/cast5_avx_glue.c b/arch/x86/crypto/cast5_avx_glue.c
index 8648158f3916..d7699130ee36 100644
--- a/arch/x86/crypto/cast5_avx_glue.c
+++ b/arch/x86/crypto/cast5_avx_glue.c
@@ -59,7 +59,7 @@ static inline void cast5_fpu_end(bool fpu_enabled)
 static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
                     bool enc)
 {
-       bool fpu_enabled = false;
+       bool fpu_enabled;
        struct cast5_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
        const unsigned int bsize = CAST5_BLOCK_SIZE;
        unsigned int nbytes;
@@ -75,7 +75,7 @@ static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
                u8 *wsrc = walk->src.virt.addr;
                u8 *wdst = walk->dst.virt.addr;
 
-               fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
+               fpu_enabled = cast5_fpu_begin(false, nbytes);
 
                /* Process multi-block batch */
                if (nbytes >= bsize * CAST5_PARALLEL_BLOCKS) {
@@ -103,10 +103,9 @@ static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk,
                } while (nbytes >= bsize);
 
 done:
+               cast5_fpu_end(fpu_enabled);
                err = blkcipher_walk_done(desc, walk, nbytes);
        }
-
-       cast5_fpu_end(fpu_enabled);
        return err;
 }
 
@@ -227,7 +226,7 @@ static unsigned int __cbc_decrypt(struct blkcipher_desc *desc,
 static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
                       struct scatterlist *src, unsigned int nbytes)
 {
-       bool fpu_enabled = false;
+       bool fpu_enabled;
        struct blkcipher_walk walk;
        int err;
 
@@ -236,12 +235,11 @@ static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
        desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 
        while ((nbytes = walk.nbytes)) {
-               fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
+               fpu_enabled = cast5_fpu_begin(false, nbytes);
                nbytes = __cbc_decrypt(desc, &walk);
+               cast5_fpu_end(fpu_enabled);
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }
-
-       cast5_fpu_end(fpu_enabled);
        return err;
 }
 
@@ -311,7 +309,7 @@ static unsigned int __ctr_crypt(struct blkcipher_desc *desc,
 static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
                     struct scatterlist *src, unsigned int nbytes)
 {
-       bool fpu_enabled = false;
+       bool fpu_enabled;
        struct blkcipher_walk walk;
        int err;
 
@@ -320,13 +318,12 @@ static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
        desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 
        while ((nbytes = walk.nbytes) >= CAST5_BLOCK_SIZE) {
-               fpu_enabled = cast5_fpu_begin(fpu_enabled, nbytes);
+               fpu_enabled = cast5_fpu_begin(false, nbytes);
                nbytes = __ctr_crypt(desc, &walk);
+               cast5_fpu_end(fpu_enabled);
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }
 
-       cast5_fpu_end(fpu_enabled);
-
        if (walk.nbytes) {
                ctr_crypt_final(desc, &walk);
                err = blkcipher_walk_done(desc, &walk, 0);
diff --git a/arch/x86/crypto/glue_helper.c b/arch/x86/crypto/glue_helper.c
index 6a85598931b5..3a506ce7ed93 100644
--- a/arch/x86/crypto/glue_helper.c
+++ b/arch/x86/crypto/glue_helper.c
@@ -39,7 +39,7 @@ static int __glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
        void *ctx = crypto_blkcipher_ctx(desc->tfm);
        const unsigned int bsize = 128 / 8;
        unsigned int nbytes, i, func_bytes;
-       bool fpu_enabled = false;
+       bool fpu_enabled;
        int err;
 
        err = blkcipher_walk_virt(desc, walk);
@@ -49,7 +49,7 @@ static int __glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
                u8 *wdst = walk->dst.virt.addr;
 
                fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
-                                            desc, fpu_enabled, nbytes);
+                                            desc, false, nbytes);
 
                for (i = 0; i < gctx->num_funcs; i++) {
                        func_bytes = bsize * gctx->funcs[i].num_blocks;
@@ -71,10 +71,10 @@ static int __glue_ecb_crypt_128bit(const struct common_glue_ctx *gctx,
                }
 
 done:
+               glue_fpu_end(fpu_enabled);
                err = blkcipher_walk_done(desc, walk, nbytes);
        }
 
-       glue_fpu_end(fpu_enabled);
        return err;
 }
 
@@ -194,7 +194,7 @@ int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
                            struct scatterlist *src, unsigned int nbytes)
 {
        const unsigned int bsize = 128 / 8;
-       bool fpu_enabled = false;
+       bool fpu_enabled;
        struct blkcipher_walk walk;
        int err;
 
@@ -203,12 +203,12 @@ int glue_cbc_decrypt_128bit(const struct common_glue_ctx *gctx,
 
        while ((nbytes = walk.nbytes)) {
                fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
-                                            desc, fpu_enabled, nbytes);
+                                            desc, false, nbytes);
                nbytes = __glue_cbc_decrypt_128bit(gctx, desc, &walk);
+               glue_fpu_end(fpu_enabled);
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }
 
-       glue_fpu_end(fpu_enabled);
        return err;
 }
 EXPORT_SYMBOL_GPL(glue_cbc_decrypt_128bit);
@@ -277,7 +277,7 @@ int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
                          struct scatterlist *src, unsigned int nbytes)
 {
        const unsigned int bsize = 128 / 8;
-       bool fpu_enabled = false;
+       bool fpu_enabled;
        struct blkcipher_walk walk;
        int err;
 
@@ -286,13 +286,12 @@ int glue_ctr_crypt_128bit(const struct common_glue_ctx *gctx,
 
        while ((nbytes = walk.nbytes) >= bsize) {
                fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
-                                            desc, fpu_enabled, nbytes);
+                                            desc, false, nbytes);
                nbytes = __glue_ctr_crypt_128bit(gctx, desc, &walk);
+               glue_fpu_end(fpu_enabled);
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }
 
-       glue_fpu_end(fpu_enabled);
-
        if (walk.nbytes) {
                glue_ctr_crypt_final_128bit(
                        gctx->funcs[gctx->num_funcs - 1].fn_u.ctr, desc, &walk);
@@ -347,7 +346,7 @@ int glue_xts_crypt_128bit(const struct common_glue_ctx *gctx,
                          void *tweak_ctx, void *crypt_ctx)
 {
        const unsigned int bsize = 128 / 8;
-       bool fpu_enabled = false;
+       bool fpu_enabled;
        struct blkcipher_walk walk;
        int err;
 
@@ -360,21 +359,21 @@ int glue_xts_crypt_128bit(const struct common_glue_ctx *gctx,
 
        /* set minimum length to bsize, for tweak_fn */
        fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
-                                    desc, fpu_enabled,
+                                    desc, false,
                                     nbytes < bsize ? bsize : nbytes);
-
        /* calculate first value of T */
        tweak_fn(tweak_ctx, walk.iv, walk.iv);
+       glue_fpu_end(fpu_enabled);
 
        while (nbytes) {
+               fpu_enabled = glue_fpu_begin(bsize, gctx->fpu_blocks_limit,
+                               desc, false, nbytes);
                nbytes = __glue_xts_crypt_128bit(gctx, crypt_ctx, desc, &walk);
 
+               glue_fpu_end(fpu_enabled);
                err = blkcipher_walk_done(desc, &walk, nbytes);
                nbytes = walk.nbytes;
        }
-
-       glue_fpu_end(fpu_enabled);
-
        return err;
 }
 EXPORT_SYMBOL_GPL(glue_xts_crypt_128bit);
diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 1a4477cedc49..75a301b6a5b6 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -220,7 +220,7 @@ long syscall_trace_enter(struct pt_regs *regs)
 
 #define EXIT_TO_USERMODE_LOOP_FLAGS                            \
        (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_UPROBE |   \
-        _TIF_NEED_RESCHED | _TIF_USER_RETURN_NOTIFY)
+        _TIF_NEED_RESCHED_MASK | _TIF_USER_RETURN_NOTIFY)
 
 static void exit_to_usermode_loop(struct pt_regs *regs, u32 cached_flags)
 {
@@ -236,9 +236,16 @@ static void exit_to_usermode_loop(struct pt_regs *regs, u32 cached_flags)
                /* We have work to do. */
                local_irq_enable();
 
-               if (cached_flags & _TIF_NEED_RESCHED)
+               if (cached_flags & _TIF_NEED_RESCHED_MASK)
                        schedule();
 
+#ifdef ARCH_RT_DELAYS_SIGNAL_SEND
+               if (unlikely(current->forced_info.si_signo)) {
+                       struct task_struct *t = current;
+                       force_sig_info(t->forced_info.si_signo, &t->forced_info, t);
+                       t->forced_info.si_signo = 0;
+               }
+#endif
                if (cached_flags & _TIF_UPROBE)
                        uprobe_notify_resume(regs);
 
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index ae678ad128a9..3bcef8bdb911 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -278,8 +278,24 @@ END(ret_from_exception)
 ENTRY(resume_kernel)
        DISABLE_INTERRUPTS(CLBR_ANY)
 need_resched:
+       # preempt count == 0 + NEED_RS set?
        cmpl    $0, PER_CPU_VAR(__preempt_count)
+#ifndef CONFIG_PREEMPT_LAZY
        jnz     restore_all
+#else
+       jz test_int_off
+
+       # atleast preempt count == 0 ?
+       cmpl $_PREEMPT_ENABLED,PER_CPU_VAR(__preempt_count)
+       jne restore_all
+
+       cmpl $0,TI_preempt_lazy_count(%ebp)     # non-zero preempt_lazy_count ?
+       jnz restore_all
+
+       testl $_TIF_NEED_RESCHED_LAZY, TI_flags(%ebp)
+       jz restore_all
+test_int_off:
+#endif
        testl   $X86_EFLAGS_IF, PT_EFLAGS(%esp) # interrupts off (exception path) ?
        jz      restore_all
        call    preempt_schedule_irq
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 952b23b5d4e9..459a68cffcc2 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -607,7 +607,23 @@ GLOBAL(retint_user)
        bt      $9, EFLAGS(%rsp)                /* were interrupts off? */
        jnc     1f
 0:     cmpl    $0, PER_CPU_VAR(__preempt_count)
+#ifndef CONFIG_PREEMPT_LAZY
        jnz     1f
+#else
+       jz      do_preempt_schedule_irq
+
+       # atleast preempt count == 0 ?
+       cmpl $_PREEMPT_ENABLED,PER_CPU_VAR(__preempt_count)
+       jnz     1f
+
+       GET_THREAD_INFO(%rcx)
+       cmpl    $0, TI_preempt_lazy_count(%rcx)
+       jnz     1f
+
+       bt      $TIF_NEED_RESCHED_LAZY,TI_flags(%rcx)
+       jnc     1f
+do_preempt_schedule_irq:
+#endif
        call    preempt_schedule_irq
        jmp     0b
 1:
@@ -897,6 +913,7 @@ END(native_load_gs_index)
        jmp     2b
        .previous
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 /* Call softirq on interrupt stack. Interrupts are off. */
 ENTRY(do_softirq_own_stack)
        pushq   %rbp
@@ -909,6 +926,7 @@ ENTRY(do_softirq_own_stack)
        decl    PER_CPU_VAR(irq_count)
        ret
 END(do_softirq_own_stack)
+#endif
 
 #ifdef CONFIG_XEN
 idtentry xen_hypervisor_callback xen_do_hypervisor_callback has_error_code=0
diff --git a/arch/x86/include/asm/preempt.h b/arch/x86/include/asm/preempt.h
index 01bcde84d3e4..6f432adc55cd 100644
--- a/arch/x86/include/asm/preempt.h
+++ b/arch/x86/include/asm/preempt.h
@@ -79,17 +79,46 @@ static __always_inline void __preempt_count_sub(int val)
  * a decrement which hits zero means we have no preempt_count and should
  * reschedule.
  */
-static __always_inline bool __preempt_count_dec_and_test(void)
+static __always_inline bool ____preempt_count_dec_and_test(void)
 {
        GEN_UNARY_RMWcc("decl", __preempt_count, __percpu_arg(0), "e");
 }
 
+static __always_inline bool __preempt_count_dec_and_test(void)
+{
+       if (____preempt_count_dec_and_test())
+               return true;
+#ifdef CONFIG_PREEMPT_LAZY
+       if (current_thread_info()->preempt_lazy_count)
+               return false;
+       return test_thread_flag(TIF_NEED_RESCHED_LAZY);
+#else
+       return false;
+#endif
+}
+
 /*
  * Returns true when we need to resched and can (barring IRQ state).
  */
 static __always_inline bool should_resched(int preempt_offset)
 {
+#ifdef CONFIG_PREEMPT_LAZY
+       u32 tmp;
+
+       tmp = raw_cpu_read_4(__preempt_count);
+       if (tmp == preempt_offset)
+               return true;
+
+       /* preempt count == 0 ? */
+       tmp &= ~PREEMPT_NEED_RESCHED;
+       if (tmp)
+               return false;
+       if (current_thread_info()->preempt_lazy_count)
+               return false;
+       return test_thread_flag(TIF_NEED_RESCHED_LAZY);
+#else
        return unlikely(raw_cpu_read_4(__preempt_count) == preempt_offset);
+#endif
 }
 
 #ifdef CONFIG_PREEMPT
diff --git a/arch/x86/include/asm/signal.h b/arch/x86/include/asm/signal.h
index 2138c9ae19ee..3f5b4ee2e2c1 100644
--- a/arch/x86/include/asm/signal.h
+++ b/arch/x86/include/asm/signal.h
@@ -23,6 +23,19 @@ typedef struct {
        unsigned long sig[_NSIG_WORDS];
 } sigset_t;
 
+/*
+ * Because some traps use the IST stack, we must keep preemption
+ * disabled while calling do_trap(), but do_trap() may call
+ * force_sig_info() which will grab the signal spin_locks for the
+ * task, which in PREEMPT_RT_FULL are mutexes.  By defining
+ * ARCH_RT_DELAYS_SIGNAL_SEND the force_sig_info() will set
+ * TIF_NOTIFY_RESUME and set up the signal to be sent on exit of the
+ * trap.
+ */
+#if defined(CONFIG_PREEMPT_RT_FULL)
+#define ARCH_RT_DELAYS_SIGNAL_SEND
+#endif
+
 #ifndef CONFIG_COMPAT
 typedef sigset_t compat_sigset_t;
 #endif
diff --git a/arch/x86/include/asm/stackprotector.h b/arch/x86/include/asm/stackprotector.h
index 58505f01962f..02fa39652cd6 100644
--- a/arch/x86/include/asm/stackprotector.h
+++ b/arch/x86/include/asm/stackprotector.h
@@ -59,7 +59,7 @@
  */
 static __always_inline void boot_init_stack_canary(void)
 {
-       u64 canary;
+       u64 uninitialized_var(canary);
        u64 tsc;
 
 #ifdef CONFIG_X86_64
@@ -70,8 +70,15 @@ static __always_inline void boot_init_stack_canary(void)
         * of randomness. The TSC only matters for very early init,
         * there it already has some randomness on most systems. Later
         * on during the bootup the random pool has true entropy too.
+        *
+        * For preempt-rt we need to weaken the randomness a bit, as
+        * we can't call into the random generator from atomic context
+        * due to locking constraints. We just leave canary
+        * uninitialized and use the TSC based randomness on top of it.
         */
+#ifndef CONFIG_PREEMPT_RT_FULL
        get_random_bytes(&canary, sizeof(canary));
+#endif
        tsc = rdtsc();
        canary += tsc + (tsc << 32UL);
 
diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index c7b551028740..ddb63bd90e3c 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -58,6 +58,8 @@ struct thread_info {
        __u32                   status;         /* thread synchronous flags */
        __u32                   cpu;            /* current CPU */
        mm_segment_t            addr_limit;
+       int                     preempt_lazy_count;     /* 0 => lazy preemptable
+                                                         <0 => BUG */
        unsigned int            sig_on_uaccess_error:1;
        unsigned int            uaccess_err:1;  /* uaccess failed */
 };
@@ -95,6 +97,7 @@ struct thread_info {
 #define TIF_SYSCALL_EMU                6       /* syscall emulation active */
 #define TIF_SYSCALL_AUDIT      7       /* syscall auditing active */
 #define TIF_SECCOMP            8       /* secure computing */
+#define TIF_NEED_RESCHED_LAZY  9       /* lazy rescheduling necessary */
 #define TIF_USER_RETURN_NOTIFY 11      /* notify kernel of userspace return */
 #define TIF_UPROBE             12      /* breakpointed or singlestepping */
 #define TIF_NOTSC              16      /* TSC is not accessible in userland */
@@ -119,6 +122,7 @@ struct thread_info {
 #define _TIF_SYSCALL_EMU       (1 << TIF_SYSCALL_EMU)
 #define _TIF_SYSCALL_AUDIT     (1 << TIF_SYSCALL_AUDIT)
 #define _TIF_SECCOMP           (1 << TIF_SECCOMP)
+#define _TIF_NEED_RESCHED_LAZY (1 << TIF_NEED_RESCHED_LAZY)
 #define _TIF_USER_RETURN_NOTIFY        (1 << TIF_USER_RETURN_NOTIFY)
 #define _TIF_UPROBE            (1 << TIF_UPROBE)
 #define _TIF_NOTSC             (1 << TIF_NOTSC)
@@ -152,6 +156,8 @@ struct thread_info {
 #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
 #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW)
 
+#define _TIF_NEED_RESCHED_MASK (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)
+
 #define STACK_WARN             (THREAD_SIZE/8)
 
 /*
diff --git a/arch/x86/include/asm/uv/uv_bau.h b/arch/x86/include/asm/uv/uv_bau.h
index fc808b83fccb..ebb40118abf5 100644
--- a/arch/x86/include/asm/uv/uv_bau.h
+++ b/arch/x86/include/asm/uv/uv_bau.h
@@ -615,9 +615,9 @@ struct bau_control {
        cycles_t                send_message;
        cycles_t                period_end;
        cycles_t                period_time;
-       spinlock_t              uvhub_lock;
-       spinlock_t              queue_lock;
-       spinlock_t              disable_lock;
+       raw_spinlock_t          uvhub_lock;
+       raw_spinlock_t          queue_lock;
+       raw_spinlock_t          disable_lock;
        /* tunables */
        int                     max_concurr;
        int                     max_concurr_const;
@@ -776,15 +776,15 @@ static inline int atom_asr(short i, struct atomic_short *v)
  * to be lowered below the current 'v'.  atomic_add_unless can only stop
  * on equal.
  */
-static inline int atomic_inc_unless_ge(spinlock_t *lock, atomic_t *v, int u)
+static inline int atomic_inc_unless_ge(raw_spinlock_t *lock, atomic_t *v, int u)
 {
-       spin_lock(lock);
+       raw_spin_lock(lock);
        if (atomic_read(v) >= u) {
-               spin_unlock(lock);
+               raw_spin_unlock(lock);
                return 0;
        }
        atomic_inc(v);
-       spin_unlock(lock);
+       raw_spin_unlock(lock);
        return 1;
 }
 
diff --git a/arch/x86/include/asm/uv/uv_hub.h b/arch/x86/include/asm/uv/uv_hub.h
index ea7074784cc4..01ec643ce66e 100644
--- a/arch/x86/include/asm/uv/uv_hub.h
+++ b/arch/x86/include/asm/uv/uv_hub.h
@@ -492,7 +492,7 @@ struct uv_blade_info {
        unsigned short  nr_online_cpus;
        unsigned short  pnode;
        short           memory_nid;
-       spinlock_t      nmi_lock;       /* obsolete, see uv_hub_nmi */
+       raw_spinlock_t  nmi_lock;       /* obsolete, see uv_hub_nmi */
        unsigned long   nmi_count;      /* obsolete, see uv_hub_nmi */
 };
 extern struct uv_blade_info *uv_blade_info;
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index a1e4a6c3f394..86adbf86f366 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -87,7 +87,9 @@ static u64 acpi_lapic_addr __initdata = APIC_DEFAULT_PHYS_BASE;
  *             ->ioapic_mutex
  *                     ->ioapic_lock
  */
+#ifdef CONFIG_X86_IO_APIC
 static DEFINE_MUTEX(acpi_ioapic_lock);
+#endif
 
 /* --------------------------------------------------------------------------
                               Boot-time Configuration
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index fc91c98bee01..29c4f1b078a1 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -1711,7 +1711,8 @@ static bool io_apic_level_ack_pending(struct mp_chip_data *data)
 static inline bool ioapic_irqd_mask(struct irq_data *data)
 {
        /* If we are moving the irq we need to mask it */
-       if (unlikely(irqd_is_setaffinity_pending(data))) {
+       if (unlikely(irqd_is_setaffinity_pending(data) &&
+                    !irqd_irq_inprogress(data))) {
                mask_ioapic_irq(data);
                return true;
        }
diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 4a139465f1d4..ad2afff02b36 100644
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -947,7 +947,7 @@ void __init uv_system_init(void)
                        uv_blade_info[blade].pnode = pnode;
                        uv_blade_info[blade].nr_possible_cpus = 0;
                        uv_blade_info[blade].nr_online_cpus = 0;
-                       spin_lock_init(&uv_blade_info[blade].nmi_lock);
+                       raw_spin_lock_init(&uv_blade_info[blade].nmi_lock);
                        min_pnode = min(pnode, min_pnode);
                        max_pnode = max(pnode, max_pnode);
                        blade++;
diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c
index 439df975bc7a..b7954ddd6a0a 100644
--- a/arch/x86/kernel/asm-offsets.c
+++ b/arch/x86/kernel/asm-offsets.c
@@ -32,6 +32,7 @@ void common(void) {
        OFFSET(TI_flags, thread_info, flags);
        OFFSET(TI_status, thread_info, status);
        OFFSET(TI_addr_limit, thread_info, addr_limit);
+       OFFSET(TI_preempt_lazy_count, thread_info, preempt_lazy_count);
 
        BLANK();
        OFFSET(crypto_tfm_ctx_offset, crypto_tfm, __crt_ctx);
@@ -89,4 +90,5 @@ void common(void) {
 
        BLANK();
        DEFINE(PTREGS_SIZE, sizeof(struct pt_regs));
+       DEFINE(_PREEMPT_ENABLED, PREEMPT_ENABLED);
 }
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 7e8a736d09db..430a4ec07811 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -41,6 +41,8 @@
 #include <linux/debugfs.h>
 #include <linux/irq_work.h>
 #include <linux/export.h>
+#include <linux/jiffies.h>
+#include <linux/swork.h>
 
 #include <asm/processor.h>
 #include <asm/traps.h>
@@ -1236,7 +1238,7 @@ void mce_log_therm_throt_event(__u64 status)
 static unsigned long check_interval = INITIAL_CHECK_INTERVAL;
 
 static DEFINE_PER_CPU(unsigned long, mce_next_interval); /* in jiffies */
-static DEFINE_PER_CPU(struct timer_list, mce_timer);
+static DEFINE_PER_CPU(struct hrtimer, mce_timer);
 
 static unsigned long mce_adjust_timer_default(unsigned long interval)
 {
@@ -1245,32 +1247,18 @@ static unsigned long mce_adjust_timer_default(unsigned long interval)
 
 static unsigned long (*mce_adjust_timer)(unsigned long interval) = mce_adjust_timer_default;
 
-static void __restart_timer(struct timer_list *t, unsigned long interval)
+static enum hrtimer_restart __restart_timer(struct hrtimer *timer, unsigned long interval)
 {
-       unsigned long when = jiffies + interval;
-       unsigned long flags;
-
-       local_irq_save(flags);
-
-       if (timer_pending(t)) {
-               if (time_before(when, t->expires))
-                       mod_timer_pinned(t, when);
-       } else {
-               t->expires = round_jiffies(when);
-               add_timer_on(t, smp_processor_id());
-       }
-
-       local_irq_restore(flags);
+       if (!interval)
+               return HRTIMER_NORESTART;
+       hrtimer_forward_now(timer, ns_to_ktime(jiffies_to_nsecs(interval)));
+       return HRTIMER_RESTART;
 }
 
-static void mce_timer_fn(unsigned long data)
+static enum hrtimer_restart mce_timer_fn(struct hrtimer *timer)
 {
-       struct timer_list *t = this_cpu_ptr(&mce_timer);
-       int cpu = smp_processor_id();
        unsigned long iv;
 
-       WARN_ON(cpu != data);
-
        iv = __this_cpu_read(mce_next_interval);
 
        if (mce_available(this_cpu_ptr(&cpu_info))) {
@@ -1293,7 +1281,7 @@ static void mce_timer_fn(unsigned long data)
 
 done:
        __this_cpu_write(mce_next_interval, iv);
-       __restart_timer(t, iv);
+       return __restart_timer(timer, iv);
 }
 
 /*
@@ -1301,7 +1289,7 @@ static void mce_timer_fn(unsigned long data)
  */
 void mce_timer_kick(unsigned long interval)
 {
-       struct timer_list *t = this_cpu_ptr(&mce_timer);
+       struct hrtimer *t = this_cpu_ptr(&mce_timer);
        unsigned long iv = __this_cpu_read(mce_next_interval);
 
        __restart_timer(t, interval);
@@ -1316,7 +1304,7 @@ static void mce_timer_delete_all(void)
        int cpu;
 
        for_each_online_cpu(cpu)
-               del_timer_sync(&per_cpu(mce_timer, cpu));
+               hrtimer_cancel(&per_cpu(mce_timer, cpu));
 }
 
 static void mce_do_trigger(struct work_struct *work)
@@ -1326,6 +1314,56 @@ static void mce_do_trigger(struct work_struct *work)
 
 static DECLARE_WORK(mce_trigger_work, mce_do_trigger);
 
+static void __mce_notify_work(struct swork_event *event)
+{
+       /* Not more than two messages every minute */
+       static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2);
+
+       /* wake processes polling /dev/mcelog */
+       wake_up_interruptible(&mce_chrdev_wait);
+
+       /*
+        * There is no risk of missing notifications because
+        * work_pending is always cleared before the function is
+        * executed.
+        */
+       if (mce_helper[0] && !work_pending(&mce_trigger_work))
+               schedule_work(&mce_trigger_work);
+
+       if (__ratelimit(&ratelimit))
+               pr_info(HW_ERR "Machine check events logged\n");
+}
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+static bool notify_work_ready __read_mostly;
+static struct swork_event notify_work;
+
+static int mce_notify_work_init(void)
+{
+       int err;
+
+       err = swork_get();
+       if (err)
+               return err;
+
+       INIT_SWORK(&notify_work, __mce_notify_work);
+       notify_work_ready = true;
+       return 0;
+}
+
+static void mce_notify_work(void)
+{
+       if (notify_work_ready)
+               swork_queue(&notify_work);
+}
+#else
+static void mce_notify_work(void)
+{
+       __mce_notify_work(NULL);
+}
+static inline int mce_notify_work_init(void) { return 0; }
+#endif
+
 /*
  * Notify the user(s) about new machine check events.
  * Can be called from interrupt context, but not from machine check/NMI
@@ -1333,19 +1371,8 @@ static DECLARE_WORK(mce_trigger_work, mce_do_trigger);
  */
 int mce_notify_irq(void)
 {
-       /* Not more than two messages every minute */
-       static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2);
-
        if (test_and_clear_bit(0, &mce_need_notify)) {
-               /* wake processes polling /dev/mcelog */
-               wake_up_interruptible(&mce_chrdev_wait);
-
-               if (mce_helper[0])
-                       schedule_work(&mce_trigger_work);
-
-               if (__ratelimit(&ratelimit))
-                       pr_info(HW_ERR "Machine check events logged\n");
-
+               mce_notify_work();
                return 1;
        }
        return 0;
@@ -1639,7 +1666,7 @@ static void __mcheck_cpu_clear_vendor(struct cpuinfo_x86 *c)
        }
 }
 
-static void mce_start_timer(unsigned int cpu, struct timer_list *t)
+static void mce_start_timer(unsigned int cpu, struct hrtimer *t)
 {
        unsigned long iv = check_interval * HZ;
 
@@ -1648,16 +1675,17 @@ static void mce_start_timer(unsigned int cpu, struct timer_list *t)
 
        per_cpu(mce_next_interval, cpu) = iv;
 
-       t->expires = round_jiffies(jiffies + iv);
-       add_timer_on(t, cpu);
+       hrtimer_start_range_ns(t, ns_to_ktime(jiffies_to_usecs(iv) * 1000ULL),
+                       0, HRTIMER_MODE_REL_PINNED);
 }
 
 static void __mcheck_cpu_init_timer(void)
 {
-       struct timer_list *t = this_cpu_ptr(&mce_timer);
+       struct hrtimer *t = this_cpu_ptr(&mce_timer);
        unsigned int cpu = smp_processor_id();
 
-       setup_timer(t, mce_timer_fn, cpu);
+       hrtimer_init(t, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+       t->function = mce_timer_fn;
        mce_start_timer(cpu, t);
 }
 
@@ -2376,6 +2404,8 @@ static void mce_disable_cpu(void *h)
        if (!mce_available(raw_cpu_ptr(&cpu_info)))
                return;
 
+       hrtimer_cancel(this_cpu_ptr(&mce_timer));
+
        if (!(action & CPU_TASKS_FROZEN))
                cmci_clear();
 
@@ -2398,6 +2428,7 @@ static void mce_reenable_cpu(void *h)
                if (b->init)
                        wrmsrl(MSR_IA32_MCx_CTL(i), b->ctl);
        }
+       __mcheck_cpu_init_timer();
 }
 
 /* Get notified when a cpu comes on/off. Be hotplug friendly. */
@@ -2405,7 +2436,6 @@ static int
 mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
 {
        unsigned int cpu = (unsigned long)hcpu;
-       struct timer_list *t = &per_cpu(mce_timer, cpu);
 
        switch (action & ~CPU_TASKS_FROZEN) {
        case CPU_ONLINE:
@@ -2425,11 +2455,9 @@ mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
                break;
        case CPU_DOWN_PREPARE:
                smp_call_function_single(cpu, mce_disable_cpu, &action, 1);
-               del_timer_sync(t);
                break;
        case CPU_DOWN_FAILED:
                smp_call_function_single(cpu, mce_reenable_cpu, &action, 1);
-               mce_start_timer(cpu, t);
                break;
        }
 
@@ -2468,6 +2496,10 @@ static __init int mcheck_init_device(void)
                goto err_out;
        }
 
+       err = mce_notify_work_init();
+       if (err)
+               goto err_out;
+
        if (!zalloc_cpumask_var(&mce_device_initialized, GFP_KERNEL)) {
                err = -ENOMEM;
                goto err_out;
diff --git a/arch/x86/kernel/cpu/perf_event_intel_rapl.c b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
index ed446bdcbf31..d2ac364e2118 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
@@ -117,7 +117,7 @@ static struct perf_pmu_events_attr event_attr_##v = {                       \
 };
 
 struct rapl_pmu {
-       spinlock_t       lock;
+       raw_spinlock_t   lock;
        int              n_active; /* number of active events */
        struct list_head active_list;
        struct pmu       *pmu; /* pointer to rapl_pmu_class */
@@ -220,13 +220,13 @@ static enum hrtimer_restart rapl_hrtimer_handle(struct hrtimer *hrtimer)
        if (!pmu->n_active)
                return HRTIMER_NORESTART;
 
-       spin_lock_irqsave(&pmu->lock, flags);
+       raw_spin_lock_irqsave(&pmu->lock, flags);
 
        list_for_each_entry(event, &pmu->active_list, active_entry) {
                rapl_event_update(event);
        }
 
-       spin_unlock_irqrestore(&pmu->lock, flags);
+       raw_spin_unlock_irqrestore(&pmu->lock, flags);
 
        hrtimer_forward_now(hrtimer, pmu->timer_interval);
 
@@ -263,9 +263,9 @@ static void rapl_pmu_event_start(struct perf_event *event, int mode)
        struct rapl_pmu *pmu = __this_cpu_read(rapl_pmu);
        unsigned long flags;
 
-       spin_lock_irqsave(&pmu->lock, flags);
+       raw_spin_lock_irqsave(&pmu->lock, flags);
        __rapl_pmu_event_start(pmu, event);
-       spin_unlock_irqrestore(&pmu->lock, flags);
+       raw_spin_unlock_irqrestore(&pmu->lock, flags);
 }
 
 static void rapl_pmu_event_stop(struct perf_event *event, int mode)
@@ -274,7 +274,7 @@ static void rapl_pmu_event_stop(struct perf_event *event, int mode)
        struct hw_perf_event *hwc = &event->hw;
        unsigned long flags;
 
-       spin_lock_irqsave(&pmu->lock, flags);
+       raw_spin_lock_irqsave(&pmu->lock, flags);
 
        /* mark event as deactivated and stopped */
        if (!(hwc->state & PERF_HES_STOPPED)) {
@@ -299,7 +299,7 @@ static void rapl_pmu_event_stop(struct perf_event *event, int mode)
                hwc->state |= PERF_HES_UPTODATE;
        }
 
-       spin_unlock_irqrestore(&pmu->lock, flags);
+       raw_spin_unlock_irqrestore(&pmu->lock, flags);
 }
 
 static int rapl_pmu_event_add(struct perf_event *event, int mode)
@@ -308,14 +308,14 @@ static int rapl_pmu_event_add(struct perf_event *event, int mode)
        struct hw_perf_event *hwc = &event->hw;
        unsigned long flags;
 
-       spin_lock_irqsave(&pmu->lock, flags);
+       raw_spin_lock_irqsave(&pmu->lock, flags);
 
        hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED;
 
        if (mode & PERF_EF_START)
                __rapl_pmu_event_start(pmu, event);
 
-       spin_unlock_irqrestore(&pmu->lock, flags);
+       raw_spin_unlock_irqrestore(&pmu->lock, flags);
 
        return 0;
 }
@@ -603,7 +603,7 @@ static int rapl_cpu_prepare(int cpu)
        pmu = kzalloc_node(sizeof(*pmu), GFP_KERNEL, cpu_to_node(cpu));
        if (!pmu)
                return -1;
-       spin_lock_init(&pmu->lock);
+       raw_spin_lock_init(&pmu->lock);
 
        INIT_LIST_HEAD(&pmu->active_list);
 
diff --git a/arch/x86/kernel/dumpstack_32.c b/arch/x86/kernel/dumpstack_32.c
index 464ffd69b92e..00db1aad1548 100644
--- a/arch/x86/kernel/dumpstack_32.c
+++ b/arch/x86/kernel/dumpstack_32.c
@@ -42,7 +42,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
                unsigned long *stack, unsigned long bp,
                const struct stacktrace_ops *ops, void *data)
 {
-       const unsigned cpu = get_cpu();
+       const unsigned cpu = get_cpu_light();
        int graph = 0;
        u32 *prev_esp;
 
@@ -86,7 +86,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
                        break;
                touch_nmi_watchdog();
        }
-       put_cpu();
+       put_cpu_light();
 }
 EXPORT_SYMBOL(dump_trace);
 
diff --git a/arch/x86/kernel/dumpstack_64.c b/arch/x86/kernel/dumpstack_64.c
index 5f1c6266eb30..c331e3fef465 100644
--- a/arch/x86/kernel/dumpstack_64.c
+++ b/arch/x86/kernel/dumpstack_64.c
@@ -152,7 +152,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
                unsigned long *stack, unsigned long bp,
                const struct stacktrace_ops *ops, void *data)
 {
-       const unsigned cpu = get_cpu();
+       const unsigned cpu = get_cpu_light();
        struct thread_info *tinfo;
        unsigned long *irq_stack = (unsigned long *)per_cpu(irq_stack_ptr, cpu);
        unsigned long dummy;
@@ -241,7 +241,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
         * This handles the process stack:
         */
        bp = ops->walk_stack(tinfo, stack, bp, ops, data, NULL, &graph);
-       put_cpu();
+       put_cpu_light();
 }
 EXPORT_SYMBOL(dump_trace);
 
@@ -255,7 +255,7 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
        int cpu;
        int i;
 
-       preempt_disable();
+       migrate_disable();
        cpu = smp_processor_id();
 
        irq_stack_end   = (unsigned long *)(per_cpu(irq_stack_ptr, cpu));
@@ -291,7 +291,7 @@ show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
                        pr_cont(" %016lx", *stack++);
                touch_nmi_watchdog();
        }
-       preempt_enable();
+       migrate_enable();
 
        pr_cont("\n");
        show_trace_log_lvl(task, regs, sp, bp, log_lvl);
diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index 38da8f29a9c8..ce71f7098f15 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -128,6 +128,7 @@ void irq_ctx_init(int cpu)
               cpu, per_cpu(hardirq_stack, cpu),  per_cpu(softirq_stack, cpu));
 }
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 void do_softirq_own_stack(void)
 {
        struct thread_info *curstk;
@@ -146,6 +147,7 @@ void do_softirq_own_stack(void)
 
        call_on_stack(__do_softirq, isp);
 }
+#endif
 
 bool handle_irq(struct irq_desc *desc, struct pt_regs *regs)
 {
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 32187f8a49b4..1f456f1e06f8 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -36,6 +36,7 @@
 #include <linux/kprobes.h>
 #include <linux/debugfs.h>
 #include <linux/nmi.h>
+#include <linux/swait.h>
 #include <asm/timer.h>
 #include <asm/cpu.h>
 #include <asm/traps.h>
@@ -91,14 +92,14 @@ static void kvm_io_delay(void)
 
 struct kvm_task_sleep_node {
        struct hlist_node link;
-       wait_queue_head_t wq;
+       struct swait_queue_head wq;
        u32 token;
        int cpu;
        bool halted;
 };
 
 static struct kvm_task_sleep_head {
-       spinlock_t lock;
+       raw_spinlock_t lock;
        struct hlist_head list;
 } async_pf_sleepers[KVM_TASK_SLEEP_HASHSIZE];
 
@@ -122,17 +123,17 @@ void kvm_async_pf_task_wait(u32 token)
        u32 key = hash_32(token, KVM_TASK_SLEEP_HASHBITS);
        struct kvm_task_sleep_head *b = &async_pf_sleepers[key];
        struct kvm_task_sleep_node n, *e;
-       DEFINE_WAIT(wait);
+       DECLARE_SWAITQUEUE(wait);
 
        rcu_irq_enter();
 
-       spin_lock(&b->lock);
+       raw_spin_lock(&b->lock);
        e = _find_apf_task(b, token);
        if (e) {
                /* dummy entry exist -> wake up was delivered ahead of PF */
                hlist_del(&e->link);
                kfree(e);
-               spin_unlock(&b->lock);
+               raw_spin_unlock(&b->lock);
 
                rcu_irq_exit();
                return;
@@ -141,13 +142,13 @@ void kvm_async_pf_task_wait(u32 token)
        n.token = token;
        n.cpu = smp_processor_id();
        n.halted = is_idle_task(current) || preempt_count() > 1;
-       init_waitqueue_head(&n.wq);
+       init_swait_queue_head(&n.wq);
        hlist_add_head(&n.link, &b->list);
-       spin_unlock(&b->lock);
+       raw_spin_unlock(&b->lock);
 
        for (;;) {
                if (!n.halted)
-                       prepare_to_wait(&n.wq, &wait, TASK_UNINTERRUPTIBLE);
+                       prepare_to_swait(&n.wq, &wait, TASK_UNINTERRUPTIBLE);
                if (hlist_unhashed(&n.link))
                        break;
 
@@ -168,7 +169,7 @@ void kvm_async_pf_task_wait(u32 token)
                rcu_irq_enter();
        }
        if (!n.halted)
-               finish_wait(&n.wq, &wait);
+               finish_swait(&n.wq, &wait);
 
        rcu_irq_exit();
        return;
@@ -180,8 +181,8 @@ static void apf_task_wake_one(struct kvm_task_sleep_node *n)
        hlist_del_init(&n->link);
        if (n->halted)
                smp_send_reschedule(n->cpu);
-       else if (waitqueue_active(&n->wq))
-               wake_up(&n->wq);
+       else if (swait_active(&n->wq))
+               swake_up(&n->wq);
 }
 
 static void apf_task_wake_all(void)
@@ -191,14 +192,14 @@ static void apf_task_wake_all(void)
        for (i = 0; i < KVM_TASK_SLEEP_HASHSIZE; i++) {
                struct hlist_node *p, *next;
                struct kvm_task_sleep_head *b = &async_pf_sleepers[i];
-               spin_lock(&b->lock);
+               raw_spin_lock(&b->lock);
                hlist_for_each_safe(p, next, &b->list) {
                        struct kvm_task_sleep_node *n =
                                hlist_entry(p, typeof(*n), link);
                        if (n->cpu == smp_processor_id())
                                apf_task_wake_one(n);
                }
-               spin_unlock(&b->lock);
+               raw_spin_unlock(&b->lock);
        }
 }
 
@@ -214,7 +215,7 @@ void kvm_async_pf_task_wake(u32 token)
        }
 
 again:
-       spin_lock(&b->lock);
+       raw_spin_lock(&b->lock);
        n = _find_apf_task(b, token);
        if (!n) {
                /*
@@ -227,17 +228,17 @@ void kvm_async_pf_task_wake(u32 token)
                         * Allocation failed! Busy wait while other cpu
                         * handles async PF.
                         */
-                       spin_unlock(&b->lock);
+                       raw_spin_unlock(&b->lock);
                        cpu_relax();
                        goto again;
                }
                n->token = token;
                n->cpu = smp_processor_id();
-               init_waitqueue_head(&n->wq);
+               init_swait_queue_head(&n->wq);
                hlist_add_head(&n->link, &b->list);
        } else
                apf_task_wake_one(n);
-       spin_unlock(&b->lock);
+       raw_spin_unlock(&b->lock);
        return;
 }
 EXPORT_SYMBOL_GPL(kvm_async_pf_task_wake);
@@ -488,7 +489,7 @@ void __init kvm_guest_init(void)
        paravirt_ops_setup();
        register_reboot_notifier(&kvm_pv_reboot_nb);
        for (i = 0; i < KVM_TASK_SLEEP_HASHSIZE; i++)
-               spin_lock_init(&async_pf_sleepers[i].lock);
+               raw_spin_lock_init(&async_pf_sleepers[i].lock);
        if (kvm_para_has_feature(KVM_FEATURE_ASYNC_PF))
                x86_init.irqs.trap_init = kvm_apf_trap_init;
 
diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index 697f90db0e37..424aec4a4c71 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -231,7 +231,7 @@ pci_serr_error(unsigned char reason, struct pt_regs *regs)
 #endif
 
        if (panic_on_unrecovered_nmi)
-               panic("NMI: Not continuing");
+               nmi_panic(regs, "NMI: Not continuing");
 
        pr_emerg("Dazed and confused, but trying to continue\n");
 
@@ -255,8 +255,16 @@ io_check_error(unsigned char reason, struct pt_regs *regs)
                 reason, smp_processor_id());
        show_regs(regs);
 
-       if (panic_on_io_nmi)
-               panic("NMI IOCK error: Not continuing");
+       if (panic_on_io_nmi) {
+               nmi_panic(regs, "NMI IOCK error: Not continuing");
+
+               /*
+                * If we end up here, it means we have received an NMI while
+                * processing panic(). Simply return without delaying and
+                * re-enabling NMIs.
+                */
+               return;
+       }
 
        /* Re-enable the IOCK line, wait for a few seconds */
        reason = (reason & NMI_REASON_CLEAR_MASK) | NMI_REASON_CLEAR_IOCHK;
@@ -297,7 +305,7 @@ unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
 
        pr_emerg("Do you have a strange power saving mode enabled?\n");
        if (unknown_nmi_panic || panic_on_unrecovered_nmi)
-               panic("NMI: Not continuing");
+               nmi_panic(regs, "NMI: Not continuing");
 
        pr_emerg("Dazed and confused, but trying to continue\n");
 }
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 9f950917528b..4dd4beae917a 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -35,6 +35,7 @@
 #include <linux/uaccess.h>
 #include <linux/io.h>
 #include <linux/kdebug.h>
+#include <linux/highmem.h>
 
 #include <asm/pgtable.h>
 #include <asm/ldt.h>
@@ -210,6 +211,35 @@ start_thread(struct pt_regs *regs, unsigned long new_ip, unsigned long new_sp)
 }
 EXPORT_SYMBOL_GPL(start_thread);
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+static void switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p)
+{
+       int i;
+
+       /*
+        * Clear @prev's kmap_atomic mappings
+        */
+       for (i = 0; i < prev_p->kmap_idx; i++) {
+               int idx = i + KM_TYPE_NR * smp_processor_id();
+               pte_t *ptep = kmap_pte - idx;
+
+               kpte_clear_flush(ptep, __fix_to_virt(FIX_KMAP_BEGIN + idx));
+       }
+       /*
+        * Restore @next_p's kmap_atomic mappings
+        */
+       for (i = 0; i < next_p->kmap_idx; i++) {
+               int idx = i + KM_TYPE_NR * smp_processor_id();
+
+               if (!pte_none(next_p->kmap_pte[i]))
+                       set_pte(kmap_pte - idx, next_p->kmap_pte[i]);
+       }
+}
+#else
+static inline void
+switch_kmaps(struct task_struct *prev_p, struct task_struct *next_p) { }
+#endif
+
 
 /*
  *     switch_to(x,y) should switch tasks from x to y.
@@ -286,6 +316,8 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
                     task_thread_info(next_p)->flags & _TIF_WORK_CTXSW_NEXT))
                __switch_to_xtra(prev_p, next_p, tss);
 
+       switch_kmaps(prev_p, next_p);
+
        /*
         * Leave lazy mode, flushing any hypercalls made here.
         * This must be done before restoring TLS segments so
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 9a16932c7258..219ffb9ba3a9 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -730,6 +730,7 @@ static int crashing_cpu;
 static nmi_shootdown_cb shootdown_callback;
 
 static atomic_t waiting_for_crash_ipi;
+static int crash_ipi_issued;
 
 static int crash_nmi_callback(unsigned int val, struct pt_regs *regs)
 {
@@ -792,6 +793,9 @@ void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 
        smp_send_nmi_allbutself();
 
+       /* Kick CPUs looping in NMI context. */
+       WRITE_ONCE(crash_ipi_issued, 1);
+
        msecs = 1000; /* Wait at most a second for the other cpus to stop */
        while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
                mdelay(1);
@@ -800,6 +804,22 @@ void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 
        /* Leave the nmi callback set */
 }
+
+/* Override the weak function in kernel/panic.c */
+void nmi_panic_self_stop(struct pt_regs *regs)
+{
+       while (1) {
+               /*
+                * Wait for the crash dumping IPI to be issued, and then
+                * call its callback directly.
+                */
+               if (READ_ONCE(crash_ipi_issued))
+                       crash_nmi_callback(0, regs); /* Don't return */
+
+               cpu_relax();
+       }
+}
+
 #else /* !CONFIG_SMP */
 void nmi_shootdown_cpus(nmi_shootdown_cb callback)
 {
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 1c96f09367ae..ffb6d9859122 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1195,7 +1195,7 @@ static void apic_update_lvtt(struct kvm_lapic *apic)
 static void apic_timer_expired(struct kvm_lapic *apic)
 {
        struct kvm_vcpu *vcpu = apic->vcpu;
-       wait_queue_head_t *q = &vcpu->wq;
+       struct swait_queue_head *q = &vcpu->wq;
        struct kvm_timer *ktimer = &apic->lapic_timer;
 
        if (atomic_read(&apic->lapic_timer.pending))
@@ -1204,8 +1204,8 @@ static void apic_timer_expired(struct kvm_lapic *apic)
        atomic_inc(&apic->lapic_timer.pending);
        kvm_set_pending_timer(vcpu);
 
-       if (waitqueue_active(q))
-               wake_up_interruptible(q);
+       if (swait_active(q))
+               swake_up(q);
 
        if (apic_lvtt_tscdeadline(apic))
                ktimer->expired_tscdeadline = ktimer->tscdeadline;
@@ -1801,6 +1801,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu)
        hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC,
                     HRTIMER_MODE_ABS);
        apic->lapic_timer.timer.function = apic_timer_fn;
+       apic->lapic_timer.timer.irqsafe = 1;
 
        /*
         * APIC is created enabled. This will prevent kvm_lapic_set_base from
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f973cfa8ff4f..b63350721623 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5836,6 +5836,13 @@ int kvm_arch_init(void *opaque)
                goto out;
        }
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+       if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
+               printk(KERN_ERR "RT requires X86_FEATURE_CONSTANT_TSC\n");
+               return -EOPNOTSUPP;
+       }
+#endif
+
        r = kvm_mmu_module_init();
        if (r)
                goto out_free_percpu;
diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c
index a6d739258137..bd24ba1c4a86 100644
--- a/arch/x86/mm/highmem_32.c
+++ b/arch/x86/mm/highmem_32.c
@@ -32,10 +32,11 @@ EXPORT_SYMBOL(kunmap);
  */
 void *kmap_atomic_prot(struct page *page, pgprot_t prot)
 {
+       pte_t pte = mk_pte(page, prot);
        unsigned long vaddr;
        int idx, type;
 
-       preempt_disable();
+       preempt_disable_nort();
        pagefault_disable();
 
        if (!PageHighMem(page))
@@ -45,7 +46,10 @@ void *kmap_atomic_prot(struct page *page, pgprot_t prot)
        idx = type + KM_TYPE_NR*smp_processor_id();
        vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
        BUG_ON(!pte_none(*(kmap_pte-idx)));
-       set_pte(kmap_pte-idx, mk_pte(page, prot));
+#ifdef CONFIG_PREEMPT_RT_FULL
+       current->kmap_pte[type] = pte;
+#endif
+       set_pte(kmap_pte-idx, pte);
        arch_flush_lazy_mmu_mode();
 
        return (void *)vaddr;
@@ -88,6 +92,9 @@ void __kunmap_atomic(void *kvaddr)
                 * is a bad idea also, in case the page changes cacheability
                 * attributes or becomes a protected page in a hypervisor.
                 */
+#ifdef CONFIG_PREEMPT_RT_FULL
+               current->kmap_pte[type] = __pte(0);
+#endif
                kpte_clear_flush(kmap_pte-idx, vaddr);
                kmap_atomic_idx_pop();
                arch_flush_lazy_mmu_mode();
@@ -100,7 +107,7 @@ void __kunmap_atomic(void *kvaddr)
 #endif
 
        pagefault_enable();
-       preempt_enable();
+       preempt_enable_nort();
 }
 EXPORT_SYMBOL(__kunmap_atomic);
 
diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c
index 9c0ff045fdd4..dd25dd1671b6 100644
--- a/arch/x86/mm/iomap_32.c
+++ b/arch/x86/mm/iomap_32.c
@@ -56,6 +56,7 @@ EXPORT_SYMBOL_GPL(iomap_free);
 
 void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot)
 {
+       pte_t pte = pfn_pte(pfn, prot);
        unsigned long vaddr;
        int idx, type;
 
@@ -65,7 +66,12 @@ void *kmap_atomic_prot_pfn(unsigned long pfn, pgprot_t prot)
        type = kmap_atomic_idx_push();
        idx = type + KM_TYPE_NR * smp_processor_id();
        vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
-       set_pte(kmap_pte - idx, pfn_pte(pfn, prot));
+       WARN_ON(!pte_none(*(kmap_pte - idx)));
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+       current->kmap_pte[type] = pte;
+#endif
+       set_pte(kmap_pte - idx, pte);
        arch_flush_lazy_mmu_mode();
 
        return (void *)vaddr;
@@ -113,6 +119,9 @@ iounmap_atomic(void __iomem *kvaddr)
                 * is a bad idea also, in case the page changes cacheability
                 * attributes or becomes a protected page in a hypervisor.
                 */
+#ifdef CONFIG_PREEMPT_RT_FULL
+               current->kmap_pte[type] = __pte(0);
+#endif
                kpte_clear_flush(kmap_pte-idx, vaddr);
                kmap_atomic_idx_pop();
        }
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 79377e2a7bcd..dca36c1f1966 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -209,7 +209,15 @@ static void cpa_flush_array(unsigned long *start, int numpages, int cache,
                            int in_flags, struct page **pages)
 {
        unsigned int i, level;
+#ifdef CONFIG_PREEMPT
+       /*
+        * Avoid wbinvd() because it causes latencies on all CPUs,
+        * regardless of any CPU isolation that may be in effect.
+        */
+       unsigned long do_wbinvd = 0;
+#else
        unsigned long do_wbinvd = cache && numpages >= 1024; /* 4M threshold */
+#endif
 
        BUG_ON(irqs_disabled());
 
diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index 3b6ec42718e4..7871083de089 100644
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -714,9 +714,9 @@ static void destination_plugged(struct bau_desc *bau_desc,
 
                quiesce_local_uvhub(hmaster);
 
-               spin_lock(&hmaster->queue_lock);
+               raw_spin_lock(&hmaster->queue_lock);
                reset_with_ipi(&bau_desc->distribution, bcp);
-               spin_unlock(&hmaster->queue_lock);
+               raw_spin_unlock(&hmaster->queue_lock);
 
                end_uvhub_quiesce(hmaster);
 
@@ -736,9 +736,9 @@ static void destination_timeout(struct bau_desc *bau_desc,
 
                quiesce_local_uvhub(hmaster);
 
-               spin_lock(&hmaster->queue_lock);
+               raw_spin_lock(&hmaster->queue_lock);
                reset_with_ipi(&bau_desc->distribution, bcp);
-               spin_unlock(&hmaster->queue_lock);
+               raw_spin_unlock(&hmaster->queue_lock);
 
                end_uvhub_quiesce(hmaster);
 
@@ -759,7 +759,7 @@ static void disable_for_period(struct bau_control *bcp, struct ptc_stats *stat)
        cycles_t tm1;
 
        hmaster = bcp->uvhub_master;
-       spin_lock(&hmaster->disable_lock);
+       raw_spin_lock(&hmaster->disable_lock);
        if (!bcp->baudisabled) {
                stat->s_bau_disabled++;
                tm1 = get_cycles();
@@ -772,7 +772,7 @@ static void disable_for_period(struct bau_control *bcp, struct ptc_stats *stat)
                        }
                }
        }
-       spin_unlock(&hmaster->disable_lock);
+       raw_spin_unlock(&hmaster->disable_lock);
 }
 
 static void count_max_concurr(int stat, struct bau_control *bcp,
@@ -835,7 +835,7 @@ static void record_send_stats(cycles_t time1, cycles_t time2,
  */
 static void uv1_throttle(struct bau_control *hmaster, struct ptc_stats *stat)
 {
-       spinlock_t *lock = &hmaster->uvhub_lock;
+       raw_spinlock_t *lock = &hmaster->uvhub_lock;
        atomic_t *v;
 
        v = &hmaster->active_descriptor_count;
@@ -968,7 +968,7 @@ static int check_enable(struct bau_control *bcp, struct ptc_stats *stat)
        struct bau_control *hmaster;
 
        hmaster = bcp->uvhub_master;
-       spin_lock(&hmaster->disable_lock);
+       raw_spin_lock(&hmaster->disable_lock);
        if (bcp->baudisabled && (get_cycles() >= bcp->set_bau_on_time)) {
                stat->s_bau_reenabled++;
                for_each_present_cpu(tcpu) {
@@ -980,10 +980,10 @@ static int check_enable(struct bau_control *bcp, struct ptc_stats *stat)
                                tbcp->period_giveups = 0;
                        }
                }
-               spin_unlock(&hmaster->disable_lock);
+               raw_spin_unlock(&hmaster->disable_lock);
                return 0;
        }
-       spin_unlock(&hmaster->disable_lock);
+       raw_spin_unlock(&hmaster->disable_lock);
        return -1;
 }
 
@@ -1901,9 +1901,9 @@ static void __init init_per_cpu_tunables(void)
                bcp->cong_reps                  = congested_reps;
                bcp->disabled_period =          sec_2_cycles(disabled_period);
                bcp->giveup_limit =             giveup_limit;
-               spin_lock_init(&bcp->queue_lock);
-               spin_lock_init(&bcp->uvhub_lock);
-               spin_lock_init(&bcp->disable_lock);
+               raw_spin_lock_init(&bcp->queue_lock);
+               raw_spin_lock_init(&bcp->uvhub_lock);
+               raw_spin_lock_init(&bcp->disable_lock);
        }
 }
 
diff --git a/arch/x86/platform/uv/uv_time.c b/arch/x86/platform/uv/uv_time.c
index 2b158a9fa1d7..5e0b122620cb 100644
--- a/arch/x86/platform/uv/uv_time.c
+++ b/arch/x86/platform/uv/uv_time.c
@@ -57,7 +57,7 @@ static DEFINE_PER_CPU(struct clock_event_device, cpu_ced);
 
 /* There is one of these allocated per node */
 struct uv_rtc_timer_head {
-       spinlock_t      lock;
+       raw_spinlock_t  lock;
        /* next cpu waiting for timer, local node relative: */
        int             next_cpu;
        /* number of cpus on this node: */
@@ -177,7 +177,7 @@ static __init int uv_rtc_allocate_timers(void)
                                uv_rtc_deallocate_timers();
                                return -ENOMEM;
                        }
-                       spin_lock_init(&head->lock);
+                       raw_spin_lock_init(&head->lock);
                        head->ncpus = uv_blade_nr_possible_cpus(bid);
                        head->next_cpu = -1;
                        blade_info[bid] = head;
@@ -231,7 +231,7 @@ static int uv_rtc_set_timer(int cpu, u64 expires)
        unsigned long flags;
        int next_cpu;
 
-       spin_lock_irqsave(&head->lock, flags);
+       raw_spin_lock_irqsave(&head->lock, flags);
 
        next_cpu = head->next_cpu;
        *t = expires;
@@ -243,12 +243,12 @@ static int uv_rtc_set_timer(int cpu, u64 expires)
                if (uv_setup_intr(cpu, expires)) {
                        *t = ULLONG_MAX;
                        uv_rtc_find_next_timer(head, pnode);
-                       spin_unlock_irqrestore(&head->lock, flags);
+                       raw_spin_unlock_irqrestore(&head->lock, flags);
                        return -ETIME;
                }
        }
 
-       spin_unlock_irqrestore(&head->lock, flags);
+       raw_spin_unlock_irqrestore(&head->lock, flags);
        return 0;
 }
 
@@ -267,7 +267,7 @@ static int uv_rtc_unset_timer(int cpu, int force)
        unsigned long flags;
        int rc = 0;
 
-       spin_lock_irqsave(&head->lock, flags);
+       raw_spin_lock_irqsave(&head->lock, flags);
 
        if ((head->next_cpu == bcpu && uv_read_rtc(NULL) >= *t) || force)
                rc = 1;
@@ -279,7 +279,7 @@ static int uv_rtc_unset_timer(int cpu, int force)
                        uv_rtc_find_next_timer(head, pnode);
        }
 
-       spin_unlock_irqrestore(&head->lock, flags);
+       raw_spin_unlock_irqrestore(&head->lock, flags);
 
        return rc;
 }
@@ -299,13 +299,18 @@ static int uv_rtc_unset_timer(int cpu, int force)
 static cycle_t uv_read_rtc(struct clocksource *cs)
 {
        unsigned long offset;
+       cycle_t cycles;
 
+       preempt_disable();
        if (uv_get_min_hub_revision_id() == 1)
                offset = 0;
        else
                offset = (uv_blade_processor_id() * L1_CACHE_BYTES) % PAGE_SIZE;
 
-       return (cycle_t)uv_read_local_mmr(UVH_RTC | offset);
+       cycles = (cycle_t)uv_read_local_mmr(UVH_RTC | offset);
+       preempt_enable();
+
+       return cycles;
 }
 
 /*
diff --git a/block/blk-core.c b/block/blk-core.c
index f5f1a55703ae..75a76bcc7ac0 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -125,6 +125,9 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
 
        INIT_LIST_HEAD(&rq->queuelist);
        INIT_LIST_HEAD(&rq->timeout_list);
+#ifdef CONFIG_PREEMPT_RT_FULL
+       INIT_WORK(&rq->work, __blk_mq_complete_request_remote_work);
+#endif
        rq->cpu = -1;
        rq->q = q;
        rq->__sector = (sector_t) -1;
@@ -233,7 +236,7 @@ EXPORT_SYMBOL(blk_start_queue_async);
  **/
 void blk_start_queue(struct request_queue *q)
 {
-       WARN_ON(!in_interrupt() && !irqs_disabled());
+       WARN_ON_NONRT(!in_interrupt() && !irqs_disabled());
 
        queue_flag_clear(QUEUE_FLAG_STOPPED, q);
        __blk_run_queue(q);
@@ -659,7 +662,7 @@ int blk_queue_enter(struct request_queue *q, gfp_t gfp)
                if (!gfpflags_allow_blocking(gfp))
                        return -EBUSY;
 
-               ret = wait_event_interruptible(q->mq_freeze_wq,
+               ret = swait_event_interruptible(q->mq_freeze_wq,
                                !atomic_read(&q->mq_freeze_depth) ||
                                blk_queue_dying(q));
                if (blk_queue_dying(q))
@@ -679,7 +682,7 @@ static void blk_queue_usage_counter_release(struct percpu_ref *ref)
        struct request_queue *q =
                container_of(ref, struct request_queue, q_usage_counter);
 
-       wake_up_all(&q->mq_freeze_wq);
+       swake_up_all(&q->mq_freeze_wq);
 }
 
 struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
@@ -741,7 +744,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
        q->bypass_depth = 1;
        __set_bit(QUEUE_FLAG_BYPASS, &q->queue_flags);
 
-       init_waitqueue_head(&q->mq_freeze_wq);
+       init_swait_queue_head(&q->mq_freeze_wq);
 
        /*
         * Init percpu_ref in atomic mode so that it's faster to shutdown.
@@ -3222,7 +3225,7 @@ static void queue_unplugged(struct request_queue *q, unsigned int depth,
                blk_run_queue_async(q);
        else
                __blk_run_queue(q);
-       spin_unlock(q->queue_lock);
+       spin_unlock_irq(q->queue_lock);
 }
 
 static void flush_plug_callbacks(struct blk_plug *plug, bool from_schedule)
@@ -3270,7 +3273,6 @@ EXPORT_SYMBOL(blk_check_plugged);
 void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
 {
        struct request_queue *q;
-       unsigned long flags;
        struct request *rq;
        LIST_HEAD(list);
        unsigned int depth;
@@ -3290,11 +3292,6 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
        q = NULL;
        depth = 0;
 
-       /*
-        * Save and disable interrupts here, to avoid doing it for every
-        * queue lock we have to take.
-        */
-       local_irq_save(flags);
        while (!list_empty(&list)) {
                rq = list_entry_rq(list.next);
                list_del_init(&rq->queuelist);
@@ -3307,7 +3304,7 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
                                queue_unplugged(q, depth, from_schedule);
                        q = rq->q;
                        depth = 0;
-                       spin_lock(q->queue_lock);
+                       spin_lock_irq(q->queue_lock);
                }
 
                /*
@@ -3334,8 +3331,6 @@ void blk_flush_plug_list(struct blk_plug *plug, bool from_schedule)
         */
        if (q)
                queue_unplugged(q, depth, from_schedule);
-
-       local_irq_restore(flags);
 }
 
 void blk_finish_plug(struct blk_plug *plug)
diff --git a/block/blk-ioc.c b/block/blk-ioc.c
index 381cb50a673c..dc8785233d94 100644
--- a/block/blk-ioc.c
+++ b/block/blk-ioc.c
@@ -7,6 +7,7 @@
 #include <linux/bio.h>
 #include <linux/blkdev.h>
 #include <linux/slab.h>
+#include <linux/delay.h>
 
 #include "blk.h"
 
@@ -109,7 +110,7 @@ static void ioc_release_fn(struct work_struct *work)
                        spin_unlock(q->queue_lock);
                } else {
                        spin_unlock_irqrestore(&ioc->lock, flags);
-                       cpu_relax();
+                       cpu_chill();
                        spin_lock_irqsave_nested(&ioc->lock, flags, 1);
                }
        }
@@ -187,7 +188,7 @@ void put_io_context_active(struct io_context *ioc)
                        spin_unlock(icq->q->queue_lock);
                } else {
                        spin_unlock_irqrestore(&ioc->lock, flags);
-                       cpu_relax();
+                       cpu_chill();
                        goto retry;
                }
        }
diff --git a/block/blk-iopoll.c b/block/blk-iopoll.c
index 0736729d6494..3e21e31d0d7e 100644
--- a/block/blk-iopoll.c
+++ b/block/blk-iopoll.c
@@ -35,6 +35,7 @@ void blk_iopoll_sched(struct blk_iopoll *iop)
        list_add_tail(&iop->list, this_cpu_ptr(&blk_cpu_iopoll));
        __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
        local_irq_restore(flags);
+       preempt_check_resched_rt();
 }
 EXPORT_SYMBOL(blk_iopoll_sched);
 
@@ -132,6 +133,7 @@ static void blk_iopoll_softirq(struct softirq_action *h)
                __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
 
        local_irq_enable();
+       preempt_check_resched_rt();
 }
 
 /**
@@ -201,6 +203,7 @@ static int blk_iopoll_cpu_notify(struct notifier_block *self,
                                 this_cpu_ptr(&blk_cpu_iopoll));
                __raise_softirq_irqoff(BLOCK_IOPOLL_SOFTIRQ);
                local_irq_enable();
+               preempt_check_resched_rt();
        }
 
        return NOTIFY_OK;
diff --git a/block/blk-mq-cpu.c b/block/blk-mq-cpu.c
index bb3ed488f7b5..628c6c13c482 100644
--- a/block/blk-mq-cpu.c
+++ b/block/blk-mq-cpu.c
@@ -16,7 +16,7 @@
 #include "blk-mq.h"
 
 static LIST_HEAD(blk_mq_cpu_notify_list);
-static DEFINE_RAW_SPINLOCK(blk_mq_cpu_notify_lock);
+static DEFINE_SPINLOCK(blk_mq_cpu_notify_lock);
 
 static int blk_mq_main_cpu_notify(struct notifier_block *self,
                                  unsigned long action, void *hcpu)
@@ -25,7 +25,10 @@ static int blk_mq_main_cpu_notify(struct notifier_block *self,
        struct blk_mq_cpu_notifier *notify;
        int ret = NOTIFY_OK;
 
-       raw_spin_lock(&blk_mq_cpu_notify_lock);
+       if (action != CPU_POST_DEAD)
+               return NOTIFY_OK;
+
+       spin_lock(&blk_mq_cpu_notify_lock);
 
        list_for_each_entry(notify, &blk_mq_cpu_notify_list, list) {
                ret = notify->notify(notify->data, action, cpu);
@@ -33,7 +36,7 @@ static int blk_mq_main_cpu_notify(struct notifier_block *self,
                        break;
        }
 
-       raw_spin_unlock(&blk_mq_cpu_notify_lock);
+       spin_unlock(&blk_mq_cpu_notify_lock);
        return ret;
 }
 
@@ -41,16 +44,16 @@ void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
 {
        BUG_ON(!notifier->notify);
 
-       raw_spin_lock(&blk_mq_cpu_notify_lock);
+       spin_lock(&blk_mq_cpu_notify_lock);
        list_add_tail(&notifier->list, &blk_mq_cpu_notify_list);
-       raw_spin_unlock(&blk_mq_cpu_notify_lock);
+       spin_unlock(&blk_mq_cpu_notify_lock);
 }
 
 void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier)
 {
-       raw_spin_lock(&blk_mq_cpu_notify_lock);
+       spin_lock(&blk_mq_cpu_notify_lock);
        list_del(&notifier->list);
-       raw_spin_unlock(&blk_mq_cpu_notify_lock);
+       spin_unlock(&blk_mq_cpu_notify_lock);
 }
 
 void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 0d1af3e44efb..e4fc80184dd8 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -92,7 +92,7 @@ EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_start);
 
 static void blk_mq_freeze_queue_wait(struct request_queue *q)
 {
-       wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter));
+       swait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter));
 }
 
 /*
@@ -130,7 +130,7 @@ void blk_mq_unfreeze_queue(struct request_queue *q)
        WARN_ON_ONCE(freeze_depth < 0);
        if (!freeze_depth) {
                percpu_ref_reinit(&q->q_usage_counter);
-               wake_up_all(&q->mq_freeze_wq);
+               swake_up_all(&q->mq_freeze_wq);
        }
 }
 EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue);
@@ -149,7 +149,7 @@ void blk_mq_wake_waiters(struct request_queue *q)
         * dying, we need to ensure that processes currently waiting on
         * the queue are notified as well.
         */
-       wake_up_all(&q->mq_freeze_wq);
+       swake_up_all(&q->mq_freeze_wq);
 }
 
 bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx)
@@ -196,6 +196,9 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
        rq->resid_len = 0;
        rq->sense = NULL;
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+       INIT_WORK(&rq->work, __blk_mq_complete_request_remote_work);
+#endif
        INIT_LIST_HEAD(&rq->timeout_list);
        rq->timeout = 0;
 
@@ -325,6 +328,17 @@ void blk_mq_end_request(struct request *rq, int error)
 }
 EXPORT_SYMBOL(blk_mq_end_request);
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+
+void __blk_mq_complete_request_remote_work(struct work_struct *work)
+{
+       struct request *rq = container_of(work, struct request, work);
+
+       rq->q->softirq_done_fn(rq);
+}
+
+#else
+
 static void __blk_mq_complete_request_remote(void *data)
 {
        struct request *rq = data;
@@ -332,6 +346,8 @@ static void __blk_mq_complete_request_remote(void *data)
        rq->q->softirq_done_fn(rq);
 }
 
+#endif
+
 static void blk_mq_ipi_complete_request(struct request *rq)
 {
        struct blk_mq_ctx *ctx = rq->mq_ctx;
@@ -343,19 +359,23 @@ static void blk_mq_ipi_complete_request(struct request *rq)
                return;
        }
 
-       cpu = get_cpu();
+       cpu = get_cpu_light();
        if (!test_bit(QUEUE_FLAG_SAME_FORCE, &rq->q->queue_flags))
                shared = cpus_share_cache(cpu, ctx->cpu);
 
        if (cpu != ctx->cpu && !shared && cpu_online(ctx->cpu)) {
+#ifdef CONFIG_PREEMPT_RT_FULL
+               schedule_work_on(ctx->cpu, &rq->work);
+#else
                rq->csd.func = __blk_mq_complete_request_remote;
                rq->csd.info = rq;
                rq->csd.flags = 0;
                smp_call_function_single_async(ctx->cpu, &rq->csd);
+#endif
        } else {
                rq->q->softirq_done_fn(rq);
        }
-       put_cpu();
+       put_cpu_light();
 }
 
 static void __blk_mq_complete_request(struct request *rq)
@@ -862,14 +882,14 @@ void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async)
                return;
 
        if (!async) {
-               int cpu = get_cpu();
+               int cpu = get_cpu_light();
                if (cpumask_test_cpu(cpu, hctx->cpumask)) {
                        __blk_mq_run_hw_queue(hctx);
-                       put_cpu();
+                       put_cpu_light();
                        return;
                }
 
-               put_cpu();
+               put_cpu_light();
        }
 
        kblockd_schedule_delayed_work_on(blk_mq_hctx_next_cpu(hctx),
@@ -1616,7 +1636,7 @@ static int blk_mq_hctx_notify(void *data, unsigned long action,
 {
        struct blk_mq_hw_ctx *hctx = data;
 
-       if (action == CPU_DEAD || action == CPU_DEAD_FROZEN)
+       if (action == CPU_POST_DEAD)
                return blk_mq_hctx_cpu_offline(hctx, cpu);
 
        /*
diff --git a/block/blk-mq.h b/block/blk-mq.h
index 713820b47b31..3cb6feb4fe23 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -74,7 +74,10 @@ struct blk_align_bitmap {
 static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
                                           unsigned int cpu)
 {
-       return per_cpu_ptr(q->queue_ctx, cpu);
+       struct blk_mq_ctx *ctx;
+
+       ctx = per_cpu_ptr(q->queue_ctx, cpu);
+       return ctx;
 }
 
 /*
@@ -85,12 +88,12 @@ static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
  */
 static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
 {
-       return __blk_mq_get_ctx(q, get_cpu());
+       return __blk_mq_get_ctx(q, get_cpu_light());
 }
 
 static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
 {
-       put_cpu();
+       put_cpu_light();
 }
 
 struct blk_mq_alloc_data {
diff --git a/block/blk-softirq.c b/block/blk-softirq.c
index 53b1737e978d..81c3c0a62edf 100644
--- a/block/blk-softirq.c
+++ b/block/blk-softirq.c
@@ -51,6 +51,7 @@ static void trigger_softirq(void *data)
                raise_softirq_irqoff(BLOCK_SOFTIRQ);
 
        local_irq_restore(flags);
+       preempt_check_resched_rt();
 }
 
 /*
@@ -93,6 +94,7 @@ static int blk_cpu_notify(struct notifier_block *self, unsigned long action,
                                 this_cpu_ptr(&blk_cpu_done));
                raise_softirq_irqoff(BLOCK_SOFTIRQ);
                local_irq_enable();
+               preempt_check_resched_rt();
        }
 
        return NOTIFY_OK;
@@ -150,6 +152,7 @@ void __blk_complete_request(struct request *req)
                goto do_local;
 
        local_irq_restore(flags);
+       preempt_check_resched_rt();
 }
 
 /**
diff --git a/block/bounce.c b/block/bounce.c
index 1cb5dd3a5da1..2f1ec8a67cbe 100644
--- a/block/bounce.c
+++ b/block/bounce.c
@@ -55,11 +55,11 @@ static void bounce_copy_vec(struct bio_vec *to, unsigned char *vfrom)
        unsigned long flags;
        unsigned char *vto;
 
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
        vto = kmap_atomic(to->bv_page);
        memcpy(vto + to->bv_offset, vfrom, to->bv_len);
        kunmap_atomic(vto);
-       local_irq_restore(flags);
+       local_irq_restore_nort(flags);
 }
 
 #else /* CONFIG_HIGHMEM */
diff --git a/crypto/algapi.c b/crypto/algapi.c
index eb58b73ca925..ee228adf2dac 100644
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -732,13 +732,13 @@ EXPORT_SYMBOL_GPL(crypto_spawn_tfm2);
 
 int crypto_register_notifier(struct notifier_block *nb)
 {
-       return blocking_notifier_chain_register(&crypto_chain, nb);
+       return srcu_notifier_chain_register(&crypto_chain, nb);
 }
 EXPORT_SYMBOL_GPL(crypto_register_notifier);
 
 int crypto_unregister_notifier(struct notifier_block *nb)
 {
-       return blocking_notifier_chain_unregister(&crypto_chain, nb);
+       return srcu_notifier_chain_unregister(&crypto_chain, nb);
 }
 EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
 
diff --git a/crypto/api.c b/crypto/api.c
index bbc147cb5dec..bc1a848f02ec 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -31,7 +31,7 @@ EXPORT_SYMBOL_GPL(crypto_alg_list);
 DECLARE_RWSEM(crypto_alg_sem);
 EXPORT_SYMBOL_GPL(crypto_alg_sem);
 
-BLOCKING_NOTIFIER_HEAD(crypto_chain);
+SRCU_NOTIFIER_HEAD(crypto_chain);
 EXPORT_SYMBOL_GPL(crypto_chain);
 
 static struct crypto_alg *crypto_larval_wait(struct crypto_alg *alg);
@@ -236,10 +236,10 @@ int crypto_probing_notify(unsigned long val, void *v)
 {
        int ok;
 
-       ok = blocking_notifier_call_chain(&crypto_chain, val, v);
+       ok = srcu_notifier_call_chain(&crypto_chain, val, v);
        if (ok == NOTIFY_DONE) {
                request_module("cryptomgr");
-               ok = blocking_notifier_call_chain(&crypto_chain, val, v);
+               ok = srcu_notifier_call_chain(&crypto_chain, val, v);
        }
 
        return ok;
diff --git a/crypto/internal.h b/crypto/internal.h
index 00e42a3ed814..2e85551e235f 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -47,7 +47,7 @@ struct crypto_larval {
 
 extern struct list_head crypto_alg_list;
 extern struct rw_semaphore crypto_alg_sem;
-extern struct blocking_notifier_head crypto_chain;
+extern struct srcu_notifier_head crypto_chain;
 
 #ifdef CONFIG_PROC_FS
 void __init crypto_init_proc(void);
@@ -143,7 +143,7 @@ static inline int crypto_is_moribund(struct crypto_alg *alg)
 
 static inline void crypto_notify(unsigned long val, void *v)
 {
-       blocking_notifier_call_chain(&crypto_chain, val, v);
+       srcu_notifier_call_chain(&crypto_chain, val, v);
 }
 
 #endif /* _CRYPTO_INTERNAL_H */
diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h
index faa97604d878..941497f31cf0 100644
--- a/drivers/acpi/acpica/acglobal.h
+++ b/drivers/acpi/acpica/acglobal.h
@@ -116,7 +116,7 @@ ACPI_GLOBAL(u8, acpi_gbl_global_lock_pending);
  * interrupt level
  */
 ACPI_GLOBAL(acpi_spinlock, acpi_gbl_gpe_lock); /* For GPE data structs and registers */
-ACPI_GLOBAL(acpi_spinlock, acpi_gbl_hardware_lock);    /* For ACPI H/W except GPE registers */
+ACPI_GLOBAL(acpi_raw_spinlock, acpi_gbl_hardware_lock);        /* For ACPI H/W except GPE registers */
 ACPI_GLOBAL(acpi_spinlock, acpi_gbl_reference_count_lock);
 
 /* Mutex for _OSI support */
diff --git a/drivers/acpi/acpica/hwregs.c b/drivers/acpi/acpica/hwregs.c
index 3cf77afd142c..dc32e72132f1 100644
--- a/drivers/acpi/acpica/hwregs.c
+++ b/drivers/acpi/acpica/hwregs.c
@@ -269,14 +269,14 @@ acpi_status acpi_hw_clear_acpi_status(void)
                          ACPI_BITMASK_ALL_FIXED_STATUS,
                          ACPI_FORMAT_UINT64(acpi_gbl_xpm1a_status.address)));
 
-       lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
+       raw_spin_lock_irqsave(acpi_gbl_hardware_lock, lock_flags);
 
        /* Clear the fixed events in PM1 A/B */
 
        status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS,
                                        ACPI_BITMASK_ALL_FIXED_STATUS);
 
-       acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
+       raw_spin_unlock_irqrestore(acpi_gbl_hardware_lock, lock_flags);
 
        if (ACPI_FAILURE(status)) {
                goto exit;
diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c
index b2e50d8007fe..ff007084dc48 100644
--- a/drivers/acpi/acpica/hwxface.c
+++ b/drivers/acpi/acpica/hwxface.c
@@ -374,7 +374,7 @@ acpi_status acpi_write_bit_register(u32 register_id, u32 value)
                return_ACPI_STATUS(AE_BAD_PARAMETER);
        }
 
-       lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock);
+       raw_spin_lock_irqsave(acpi_gbl_hardware_lock, lock_flags);
 
        /*
         * At this point, we know that the parent register is one of the
@@ -435,7 +435,7 @@ acpi_status acpi_write_bit_register(u32 register_id, u32 value)
 
 unlock_and_exit:
 
-       acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags);
+       raw_spin_unlock_irqrestore(acpi_gbl_hardware_lock, lock_flags);
        return_ACPI_STATUS(status);
 }
 
diff --git a/drivers/acpi/acpica/utmutex.c b/drivers/acpi/acpica/utmutex.c
index ce406e39b669..41a75eb3ae9d 100644
--- a/drivers/acpi/acpica/utmutex.c
+++ b/drivers/acpi/acpica/utmutex.c
@@ -88,7 +88,7 @@ acpi_status acpi_ut_mutex_initialize(void)
                return_ACPI_STATUS (status);
        }
 
-       status = acpi_os_create_lock (&acpi_gbl_hardware_lock);
+       status = acpi_os_create_raw_lock (&acpi_gbl_hardware_lock);
        if (ACPI_FAILURE (status)) {
                return_ACPI_STATUS (status);
        }
@@ -156,7 +156,7 @@ void acpi_ut_mutex_terminate(void)
        /* Delete the spinlocks */
 
        acpi_os_delete_lock(acpi_gbl_gpe_lock);
-       acpi_os_delete_lock(acpi_gbl_hardware_lock);
+       acpi_os_delete_raw_lock(acpi_gbl_hardware_lock);
        acpi_os_delete_lock(acpi_gbl_reference_count_lock);
 
        /* Delete the reader/writer lock */
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 18de4c457068..dfecf14df732 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -678,9 +678,9 @@ unsigned int ata_sff_data_xfer_noirq(struct ata_device *dev, unsigned char *buf,
        unsigned long flags;
        unsigned int consumed;
 
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
        consumed = ata_sff_data_xfer32(dev, buf, buflen, rw);
-       local_irq_restore(flags);
+       local_irq_restore_nort(flags);
 
        return consumed;
 }
@@ -719,7 +719,7 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
                unsigned long flags;
 
                /* FIXME: use a bounce buffer */
-               local_irq_save(flags);
+               local_irq_save_nort(flags);
                buf = kmap_atomic(page);
 
                /* do the actual data transfer */
@@ -727,7 +727,7 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
                                       do_write);
 
                kunmap_atomic(buf);
-               local_irq_restore(flags);
+               local_irq_restore_nort(flags);
        } else {
                buf = page_address(page);
                ap->ops->sff_data_xfer(qc->dev, buf + offset, qc->sect_size,
@@ -864,7 +864,7 @@ static int __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
                unsigned long flags;
 
                /* FIXME: use bounce buffer */
-               local_irq_save(flags);
+               local_irq_save_nort(flags);
                buf = kmap_atomic(page);
 
                /* do the actual data transfer */
@@ -872,7 +872,7 @@ static int __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
                                                                count, rw);
 
                kunmap_atomic(buf);
-               local_irq_restore(flags);
+               local_irq_restore_nort(flags);
        } else {
                buf = page_address(page);
                consumed = ap->ops->sff_data_xfer(dev,  buf + offset,
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 502406c9e6e1..91d909148688 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -520,6 +520,8 @@ static struct zram_meta *zram_meta_alloc(char *pool_name, u64 disksize)
                goto out_error;
        }
 
+       zram_meta_init_table_locks(meta, disksize);
+
        return meta;
 
 out_error:
@@ -568,12 +570,12 @@ static int zram_decompress_page(struct zram *zram, char *mem, u32 index)
        unsigned long handle;
        size_t size;
 
-       bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+       zram_lock_table(&meta->table[index]);
        handle = meta->table[index].handle;
        size = zram_get_obj_size(meta, index);
 
        if (!handle || zram_test_flag(meta, index, ZRAM_ZERO)) {
-               bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+               zram_unlock_table(&meta->table[index]);
                memset(mem, 0, PAGE_SIZE);
                return 0;
        }
@@ -584,7 +586,7 @@ static int zram_decompress_page(struct zram *zram, char *mem, u32 index)
        else
                ret = zcomp_decompress(zram->comp, cmem, size, mem);
        zs_unmap_object(meta->mem_pool, handle);
-       bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+       zram_unlock_table(&meta->table[index]);
 
        /* Should NEVER happen. Return bio error if it does. */
        if (unlikely(ret)) {
@@ -604,14 +606,14 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,
        struct zram_meta *meta = zram->meta;
        page = bvec->bv_page;
 
-       bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+       zram_lock_table(&meta->table[index]);
        if (unlikely(!meta->table[index].handle) ||
                        zram_test_flag(meta, index, ZRAM_ZERO)) {
-               bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+               zram_unlock_table(&meta->table[index]);
                handle_zero_page(bvec);
                return 0;
        }
-       bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+       zram_unlock_table(&meta->table[index]);
 
        if (is_partial_io(bvec))
                /* Use  a temporary buffer to decompress the page */
@@ -689,10 +691,10 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
                if (user_mem)
                        kunmap_atomic(user_mem);
                /* Free memory associated with this sector now. */
-               bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+               zram_lock_table(&meta->table[index]);
                zram_free_page(zram, index);
                zram_set_flag(meta, index, ZRAM_ZERO);
-               bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+               zram_unlock_table(&meta->table[index]);
 
                atomic64_inc(&zram->stats.zero_pages);
                ret = 0;
@@ -752,12 +754,12 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
         * Free memory associated with this sector
         * before overwriting unused sectors.
         */
-       bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+       zram_lock_table(&meta->table[index]);
        zram_free_page(zram, index);
 
        meta->table[index].handle = handle;
        zram_set_obj_size(meta, index, clen);
-       bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+       zram_unlock_table(&meta->table[index]);
 
        /* Update stats */
        atomic64_add(clen, &zram->stats.compr_data_size);
@@ -800,9 +802,9 @@ static void zram_bio_discard(struct zram *zram, u32 index,
        }
 
        while (n >= PAGE_SIZE) {
-               bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+               zram_lock_table(&meta->table[index]);
                zram_free_page(zram, index);
-               bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+               zram_unlock_table(&meta->table[index]);
                atomic64_inc(&zram->stats.notify_free);
                index++;
                n -= PAGE_SIZE;
@@ -928,9 +930,9 @@ static void zram_slot_free_notify(struct block_device *bdev,
        zram = bdev->bd_disk->private_data;
        meta = zram->meta;
 
-       bit_spin_lock(ZRAM_ACCESS, &meta->table[index].value);
+       zram_lock_table(&meta->table[index]);
        zram_free_page(zram, index);
-       bit_spin_unlock(ZRAM_ACCESS, &meta->table[index].value);
+       zram_unlock_table(&meta->table[index]);
        atomic64_inc(&zram->stats.notify_free);
 }
 
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index 8e92339686d7..9e3e953d680e 100644
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -72,6 +72,9 @@ enum zram_pageflags {
 struct zram_table_entry {
        unsigned long handle;
        unsigned long value;
+#ifdef CONFIG_PREEMPT_RT_BASE
+       spinlock_t lock;
+#endif
 };
 
 struct zram_stats {
@@ -119,4 +122,42 @@ struct zram {
         */
        bool claim; /* Protected by bdev->bd_mutex */
 };
+
+#ifndef CONFIG_PREEMPT_RT_BASE
+static inline void zram_lock_table(struct zram_table_entry *table)
+{
+       bit_spin_lock(ZRAM_ACCESS, &table->value);
+}
+
+static inline void zram_unlock_table(struct zram_table_entry *table)
+{
+       bit_spin_unlock(ZRAM_ACCESS, &table->value);
+}
+
+static inline void zram_meta_init_table_locks(struct zram_meta *meta, u64 disksize) { }
+#else /* CONFIG_PREEMPT_RT_BASE */
+static inline void zram_lock_table(struct zram_table_entry *table)
+{
+       spin_lock(&table->lock);
+       __set_bit(ZRAM_ACCESS, &table->value);
+}
+
+static inline void zram_unlock_table(struct zram_table_entry *table)
+{
+       __clear_bit(ZRAM_ACCESS, &table->value);
+       spin_unlock(&table->lock);
+}
+
+static inline void zram_meta_init_table_locks(struct zram_meta *meta, u64 disksize)
+{
+        size_t num_pages = disksize >> PAGE_SHIFT;
+        size_t index;
+
+        for (index = 0; index < num_pages; index++) {
+               spinlock_t *lock = &meta->table[index].lock;
+               spin_lock_init(lock);
+        }
+}
+#endif /* CONFIG_PREEMPT_RT_BASE */
+
 #endif
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 1822472dffab..46c0e27cf27f 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -260,6 +260,7 @@
 #include <linux/irq.h>
 #include <linux/syscalls.h>
 #include <linux/completion.h>
+#include <linux/locallock.h>
 
 #include <asm/processor.h>
 #include <asm/uaccess.h>
@@ -799,8 +800,6 @@ static void add_timer_randomness(struct timer_rand_state *state, unsigned num)
        } sample;
        long delta, delta2, delta3;
 
-       preempt_disable();
-
        sample.jiffies = jiffies;
        sample.cycles = random_get_entropy();
        sample.num = num;
@@ -841,7 +840,6 @@ static void add_timer_randomness(struct timer_rand_state *state, unsigned num)
                 */
                credit_entropy_bits(r, min_t(int, fls(delta>>1), 11));
        }
-       preempt_enable();
 }
 
 void add_input_randomness(unsigned int type, unsigned int code,
@@ -894,28 +892,27 @@ static __u32 get_reg(struct fast_pool *f, struct pt_regs *regs)
        return *(ptr + f->reg_idx++);
 }
 
-void add_interrupt_randomness(int irq, int irq_flags)
+void add_interrupt_randomness(int irq, int irq_flags, __u64 ip)
 {
        struct entropy_store    *r;
        struct fast_pool        *fast_pool = this_cpu_ptr(&irq_randomness);
-       struct pt_regs          *regs = get_irq_regs();
        unsigned long           now = jiffies;
        cycles_t                cycles = random_get_entropy();
        __u32                   c_high, j_high;
-       __u64                   ip;
        unsigned long           seed;
        int                     credit = 0;
 
        if (cycles == 0)
-               cycles = get_reg(fast_pool, regs);
+               cycles = get_reg(fast_pool, NULL);
        c_high = (sizeof(cycles) > 4) ? cycles >> 32 : 0;
        j_high = (sizeof(now) > 4) ? now >> 32 : 0;
        fast_pool->pool[0] ^= cycles ^ j_high ^ irq;
        fast_pool->pool[1] ^= now ^ c_high;
-       ip = regs ? instruction_pointer(regs) : _RET_IP_;
+       if (!ip)
+               ip = _RET_IP_;
        fast_pool->pool[2] ^= ip;
        fast_pool->pool[3] ^= (sizeof(ip) > 4) ? ip >> 32 :
-               get_reg(fast_pool, regs);
+               get_reg(fast_pool, NULL);
 
        fast_mix(fast_pool);
        add_interrupt_bench(cycles);
@@ -1800,6 +1797,7 @@ int random_int_secret_init(void)
 
 static DEFINE_PER_CPU(__u32 [MD5_DIGEST_WORDS], get_random_int_hash)
                __aligned(sizeof(unsigned long));
+static DEFINE_LOCAL_IRQ_LOCK(hash_entropy_int_lock);
 
 /*
  * Get a random word for internal kernel use only. Similar to urandom but
@@ -1815,12 +1813,12 @@ unsigned int get_random_int(void)
        if (arch_get_random_int(&ret))
                return ret;
 
-       hash = get_cpu_var(get_random_int_hash);
+       hash = get_locked_var(hash_entropy_int_lock, get_random_int_hash);
 
        hash[0] += current->pid + jiffies + random_get_entropy();
        md5_transform(hash, random_int_secret);
        ret = hash[0];
-       put_cpu_var(get_random_int_hash);
+       put_locked_var(hash_entropy_int_lock, get_random_int_hash);
 
        return ret;
 }
@@ -1837,12 +1835,12 @@ unsigned long get_random_long(void)
        if (arch_get_random_long(&ret))
                return ret;
 
-       hash = get_cpu_var(get_random_int_hash);
+       hash = get_locked_var(hash_entropy_int_lock, get_random_int_hash);
 
        hash[0] += current->pid + jiffies + random_get_entropy();
        md5_transform(hash, random_int_secret);
        ret = *(unsigned long *)hash;
-       put_cpu_var(get_random_int_hash);
+       put_locked_var(hash_entropy_int_lock, get_random_int_hash);
 
        return ret;
 }
diff --git a/drivers/clk/at91/clk-generated.c b/drivers/clk/at91/clk-generated.c
index abc80949e1dd..4ad3298eb372 100644
--- a/drivers/clk/at91/clk-generated.c
+++ b/drivers/clk/at91/clk-generated.c
@@ -15,8 +15,8 @@
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include "pmc.h"
 
@@ -28,8 +28,9 @@
 
 struct clk_generated {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
+       struct regmap *regmap;
        struct clk_range range;
+       spinlock_t *lock;
        u32 id;
        u32 gckdiv;
        u8 parent_id;
@@ -41,49 +42,52 @@ struct clk_generated {
 static int clk_generated_enable(struct clk_hw *hw)
 {
        struct clk_generated *gck = to_clk_generated(hw);
-       struct at91_pmc *pmc = gck->pmc;
-       u32 tmp;
+       unsigned long flags;
 
        pr_debug("GCLK: %s, gckdiv = %d, parent id = %d\n",
                 __func__, gck->gckdiv, gck->parent_id);
 
-       pmc_lock(pmc);
-       pmc_write(pmc, AT91_PMC_PCR, (gck->id & AT91_PMC_PCR_PID_MASK));
-       tmp = pmc_read(pmc, AT91_PMC_PCR) &
-                       ~(AT91_PMC_PCR_GCKDIV_MASK | AT91_PMC_PCR_GCKCSS_MASK);
-       pmc_write(pmc, AT91_PMC_PCR, tmp | AT91_PMC_PCR_GCKCSS(gck->parent_id)
-                                        | AT91_PMC_PCR_CMD
-                                        | AT91_PMC_PCR_GCKDIV(gck->gckdiv)
-                                        | AT91_PMC_PCR_GCKEN);
-       pmc_unlock(pmc);
+       spin_lock_irqsave(gck->lock, flags);
+       regmap_write(gck->regmap, AT91_PMC_PCR,
+                    (gck->id & AT91_PMC_PCR_PID_MASK));
+       regmap_update_bits(gck->regmap, AT91_PMC_PCR,
+                          AT91_PMC_PCR_GCKDIV_MASK | AT91_PMC_PCR_GCKCSS_MASK |
+                          AT91_PMC_PCR_CMD | AT91_PMC_PCR_GCKEN,
+                          AT91_PMC_PCR_GCKCSS(gck->parent_id) |
+                          AT91_PMC_PCR_CMD |
+                          AT91_PMC_PCR_GCKDIV(gck->gckdiv) |
+                          AT91_PMC_PCR_GCKEN);
+       spin_unlock_irqrestore(gck->lock, flags);
        return 0;
 }
 
 static void clk_generated_disable(struct clk_hw *hw)
 {
        struct clk_generated *gck = to_clk_generated(hw);
-       struct at91_pmc *pmc = gck->pmc;
-       u32 tmp;
-
-       pmc_lock(pmc);
-       pmc_write(pmc, AT91_PMC_PCR, (gck->id & AT91_PMC_PCR_PID_MASK));
-       tmp = pmc_read(pmc, AT91_PMC_PCR) & ~AT91_PMC_PCR_GCKEN;
-       pmc_write(pmc, AT91_PMC_PCR, tmp | AT91_PMC_PCR_CMD);
-       pmc_unlock(pmc);
+       unsigned long flags;
+
+       spin_lock_irqsave(gck->lock, flags);
+       regmap_write(gck->regmap, AT91_PMC_PCR,
+                    (gck->id & AT91_PMC_PCR_PID_MASK));
+       regmap_update_bits(gck->regmap, AT91_PMC_PCR,
+                          AT91_PMC_PCR_CMD | AT91_PMC_PCR_GCKEN,
+                          AT91_PMC_PCR_CMD);
+       spin_unlock_irqrestore(gck->lock, flags);
 }
 
 static int clk_generated_is_enabled(struct clk_hw *hw)
 {
        struct clk_generated *gck = to_clk_generated(hw);
-       struct at91_pmc *pmc = gck->pmc;
-       int ret;
+       unsigned long flags;
+       unsigned int status;
 
-       pmc_lock(pmc);
-       pmc_write(pmc, AT91_PMC_PCR, (gck->id & AT91_PMC_PCR_PID_MASK));
-       ret = !!(pmc_read(pmc, AT91_PMC_PCR) & AT91_PMC_PCR_GCKEN);
-       pmc_unlock(pmc);
+       spin_lock_irqsave(gck->lock, flags);
+       regmap_write(gck->regmap, AT91_PMC_PCR,
+                    (gck->id & AT91_PMC_PCR_PID_MASK));
+       regmap_read(gck->regmap, AT91_PMC_PCR, &status);
+       spin_unlock_irqrestore(gck->lock, flags);
 
-       return ret;
+       return status & AT91_PMC_PCR_GCKEN ? 1 : 0;
 }
 
 static unsigned long
@@ -214,13 +218,14 @@ static const struct clk_ops generated_ops = {
  */
 static void clk_generated_startup(struct clk_generated *gck)
 {
-       struct at91_pmc *pmc = gck->pmc;
        u32 tmp;
+       unsigned long flags;
 
-       pmc_lock(pmc);
-       pmc_write(pmc, AT91_PMC_PCR, (gck->id & AT91_PMC_PCR_PID_MASK));
-       tmp = pmc_read(pmc, AT91_PMC_PCR);
-       pmc_unlock(pmc);
+       spin_lock_irqsave(gck->lock, flags);
+       regmap_write(gck->regmap, AT91_PMC_PCR,
+                    (gck->id & AT91_PMC_PCR_PID_MASK));
+       regmap_read(gck->regmap, AT91_PMC_PCR, &tmp);
+       spin_unlock_irqrestore(gck->lock, flags);
 
        gck->parent_id = (tmp & AT91_PMC_PCR_GCKCSS_MASK)
                                        >> AT91_PMC_PCR_GCKCSS_OFFSET;
@@ -229,8 +234,8 @@ static void clk_generated_startup(struct clk_generated *gck)
 }
 
 static struct clk * __init
-at91_clk_register_generated(struct at91_pmc *pmc, const char *name,
-                           const char **parent_names, u8 num_parents,
+at91_clk_register_generated(struct regmap *regmap,  spinlock_t *lock, const char
+                           *name, const char **parent_names, u8 num_parents,
                            u8 id, const struct clk_range *range)
 {
        struct clk_generated *gck;
@@ -249,7 +254,8 @@ at91_clk_register_generated(struct at91_pmc *pmc, const char *name,
 
        gck->id = id;
        gck->hw.init = &init;
-       gck->pmc = pmc;
+       gck->regmap = regmap;
+       gck->lock = lock;
        gck->range = *range;
 
        clk = clk_register(NULL, &gck->hw);
@@ -261,8 +267,7 @@ at91_clk_register_generated(struct at91_pmc *pmc, const char *name,
        return clk;
 }
 
-void __init of_sama5d2_clk_generated_setup(struct device_node *np,
-                                          struct at91_pmc *pmc)
+void __init of_sama5d2_clk_generated_setup(struct device_node *np)
 {
        int num;
        u32 id;
@@ -272,6 +277,7 @@ void __init of_sama5d2_clk_generated_setup(struct device_node *np,
        const char *parent_names[GENERATED_SOURCE_MAX];
        struct device_node *gcknp;
        struct clk_range range = CLK_RANGE(0, 0);
+       struct regmap *regmap;
 
        num_parents = of_clk_get_parent_count(np);
        if (num_parents <= 0 || num_parents > GENERATED_SOURCE_MAX)
@@ -283,6 +289,10 @@ void __init of_sama5d2_clk_generated_setup(struct device_node *np,
        if (!num || num > PERIPHERAL_MAX)
                return;
 
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
+
        for_each_child_of_node(np, gcknp) {
                if (of_property_read_u32(gcknp, "reg", &id))
                        continue;
@@ -296,11 +306,14 @@ void __init of_sama5d2_clk_generated_setup(struct device_node *np,
                of_at91_get_clk_range(gcknp, "atmel,clk-output-range",
                                      &range);
 
-               clk = at91_clk_register_generated(pmc, name, parent_names,
-                                                 num_parents, id, &range);
+               clk = at91_clk_register_generated(regmap, &pmc_pcr_lock, name,
+                                                 parent_names, num_parents,
+                                                 id, &range);
                if (IS_ERR(clk))
                        continue;
 
                of_clk_add_provider(gcknp, of_clk_src_simple_get, clk);
        }
 }
+CLK_OF_DECLARE(of_sama5d2_clk_generated_setup, "atmel,sama5d2-clk-generated",
+              of_sama5d2_clk_generated_setup);
diff --git a/drivers/clk/at91/clk-h32mx.c b/drivers/clk/at91/clk-h32mx.c
index a165230e7eda..8e20c8a76db7 100644
--- a/drivers/clk/at91/clk-h32mx.c
+++ b/drivers/clk/at91/clk-h32mx.c
@@ -15,15 +15,9 @@
 #include <linux/clk-provider.h>
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
-#include <linux/delay.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/io.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/sched.h>
-#include <linux/wait.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
 
 #include "pmc.h"
 
@@ -31,7 +25,7 @@
 
 struct clk_sama5d4_h32mx {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
+       struct regmap *regmap;
 };
 
 #define to_clk_sama5d4_h32mx(hw) container_of(hw, struct clk_sama5d4_h32mx, hw)
@@ -40,8 +34,10 @@ static unsigned long clk_sama5d4_h32mx_recalc_rate(struct clk_hw *hw,
                                                 unsigned long parent_rate)
 {
        struct clk_sama5d4_h32mx *h32mxclk = to_clk_sama5d4_h32mx(hw);
+       unsigned int mckr;
 
-       if (pmc_read(h32mxclk->pmc, AT91_PMC_MCKR) & AT91_PMC_H32MXDIV)
+       regmap_read(h32mxclk->regmap, AT91_PMC_MCKR, &mckr);
+       if (mckr & AT91_PMC_H32MXDIV)
                return parent_rate / 2;
 
        if (parent_rate > H32MX_MAX_FREQ)
@@ -70,18 +66,16 @@ static int clk_sama5d4_h32mx_set_rate(struct clk_hw *hw, unsigned long rate,
                                    unsigned long parent_rate)
 {
        struct clk_sama5d4_h32mx *h32mxclk = to_clk_sama5d4_h32mx(hw);
-       struct at91_pmc *pmc = h32mxclk->pmc;
-       u32 tmp;
+       u32 mckr = 0;
 
        if (parent_rate != rate && (parent_rate / 2) != rate)
                return -EINVAL;
 
-       pmc_lock(pmc);
-       tmp = pmc_read(pmc, AT91_PMC_MCKR) & ~AT91_PMC_H32MXDIV;
        if ((parent_rate / 2) == rate)
-               tmp |= AT91_PMC_H32MXDIV;
-       pmc_write(pmc, AT91_PMC_MCKR, tmp);
-       pmc_unlock(pmc);
+               mckr = AT91_PMC_H32MXDIV;
+
+       regmap_update_bits(h32mxclk->regmap, AT91_PMC_MCKR,
+                          AT91_PMC_H32MXDIV, mckr);
 
        return 0;
 }
@@ -92,14 +86,18 @@ static const struct clk_ops h32mx_ops = {
        .set_rate = clk_sama5d4_h32mx_set_rate,
 };
 
-void __init of_sama5d4_clk_h32mx_setup(struct device_node *np,
-                                    struct at91_pmc *pmc)
+static void __init of_sama5d4_clk_h32mx_setup(struct device_node *np)
 {
        struct clk_sama5d4_h32mx *h32mxclk;
        struct clk_init_data init;
        const char *parent_name;
+       struct regmap *regmap;
        struct clk *clk;
 
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
+
        h32mxclk = kzalloc(sizeof(*h32mxclk), GFP_KERNEL);
        if (!h32mxclk)
                return;
@@ -113,7 +111,7 @@ void __init of_sama5d4_clk_h32mx_setup(struct device_node *np,
        init.flags = CLK_SET_RATE_GATE;
 
        h32mxclk->hw.init = &init;
-       h32mxclk->pmc = pmc;
+       h32mxclk->regmap = regmap;
 
        clk = clk_register(NULL, &h32mxclk->hw);
        if (IS_ERR(clk)) {
@@ -123,3 +121,5 @@ void __init of_sama5d4_clk_h32mx_setup(struct device_node *np,
 
        of_clk_add_provider(np, of_clk_src_simple_get, clk);
 }
+CLK_OF_DECLARE(of_sama5d4_clk_h32mx_setup, "atmel,sama5d4-clk-h32mx",
+              of_sama5d4_clk_h32mx_setup);
diff --git a/drivers/clk/at91/clk-main.c b/drivers/clk/at91/clk-main.c
index fd7247deabdc..4bfc94d6c26e 100644
--- a/drivers/clk/at91/clk-main.c
+++ b/drivers/clk/at91/clk-main.c
@@ -13,13 +13,8 @@
 #include <linux/clk/at91_pmc.h>
 #include <linux/delay.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/io.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/sched.h>
-#include <linux/wait.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include "pmc.h"
 
@@ -34,18 +29,14 @@
 
 struct clk_main_osc {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
-       unsigned int irq;
-       wait_queue_head_t wait;
+       struct regmap *regmap;
 };
 
 #define to_clk_main_osc(hw) container_of(hw, struct clk_main_osc, hw)
 
 struct clk_main_rc_osc {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
-       unsigned int irq;
-       wait_queue_head_t wait;
+       struct regmap *regmap;
        unsigned long frequency;
        unsigned long accuracy;
 };
@@ -54,51 +45,47 @@ struct clk_main_rc_osc {
 
 struct clk_rm9200_main {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
+       struct regmap *regmap;
 };
 
 #define to_clk_rm9200_main(hw) container_of(hw, struct clk_rm9200_main, hw)
 
 struct clk_sam9x5_main {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
-       unsigned int irq;
-       wait_queue_head_t wait;
+       struct regmap *regmap;
        u8 parent;
 };
 
 #define to_clk_sam9x5_main(hw) container_of(hw, struct clk_sam9x5_main, hw)
 
-static irqreturn_t clk_main_osc_irq_handler(int irq, void *dev_id)
+static inline bool clk_main_osc_ready(struct regmap *regmap)
 {
-       struct clk_main_osc *osc = dev_id;
+       unsigned int status;
 
-       wake_up(&osc->wait);
-       disable_irq_nosync(osc->irq);
+       regmap_read(regmap, AT91_PMC_SR, &status);
 
-       return IRQ_HANDLED;
+       return status & AT91_PMC_MOSCS;
 }
 
 static int clk_main_osc_prepare(struct clk_hw *hw)
 {
        struct clk_main_osc *osc = to_clk_main_osc(hw);
-       struct at91_pmc *pmc = osc->pmc;
+       struct regmap *regmap = osc->regmap;
        u32 tmp;
 
-       tmp = pmc_read(pmc, AT91_CKGR_MOR) & ~MOR_KEY_MASK;
+       regmap_read(regmap, AT91_CKGR_MOR, &tmp);
+       tmp &= ~MOR_KEY_MASK;
+
        if (tmp & AT91_PMC_OSCBYPASS)
                return 0;
 
        if (!(tmp & AT91_PMC_MOSCEN)) {
                tmp |= AT91_PMC_MOSCEN | AT91_PMC_KEY;
-               pmc_write(pmc, AT91_CKGR_MOR, tmp);
+               regmap_write(regmap, AT91_CKGR_MOR, tmp);
        }
 
-       while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCS)) {
-               enable_irq(osc->irq);
-               wait_event(osc->wait,
-                          pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCS);
-       }
+       while (!clk_main_osc_ready(regmap))
+               cpu_relax();
 
        return 0;
 }
@@ -106,9 +93,10 @@ static int clk_main_osc_prepare(struct clk_hw *hw)
 static void clk_main_osc_unprepare(struct clk_hw *hw)
 {
        struct clk_main_osc *osc = to_clk_main_osc(hw);
-       struct at91_pmc *pmc = osc->pmc;
-       u32 tmp = pmc_read(pmc, AT91_CKGR_MOR);
+       struct regmap *regmap = osc->regmap;
+       u32 tmp;
 
+       regmap_read(regmap, AT91_CKGR_MOR, &tmp);
        if (tmp & AT91_PMC_OSCBYPASS)
                return;
 
@@ -116,20 +104,22 @@ static void clk_main_osc_unprepare(struct clk_hw *hw)
                return;
 
        tmp &= ~(AT91_PMC_KEY | AT91_PMC_MOSCEN);
-       pmc_write(pmc, AT91_CKGR_MOR, tmp | AT91_PMC_KEY);
+       regmap_write(regmap, AT91_CKGR_MOR, tmp | AT91_PMC_KEY);
 }
 
 static int clk_main_osc_is_prepared(struct clk_hw *hw)
 {
        struct clk_main_osc *osc = to_clk_main_osc(hw);
-       struct at91_pmc *pmc = osc->pmc;
-       u32 tmp = pmc_read(pmc, AT91_CKGR_MOR);
+       struct regmap *regmap = osc->regmap;
+       u32 tmp, status;
 
+       regmap_read(regmap, AT91_CKGR_MOR, &tmp);
        if (tmp & AT91_PMC_OSCBYPASS)
                return 1;
 
-       return !!((pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCS) &&
-                 (pmc_read(pmc, AT91_CKGR_MOR) & AT91_PMC_MOSCEN));
+       regmap_read(regmap, AT91_PMC_SR, &status);
+
+       return (status & AT91_PMC_MOSCS) && (tmp & AT91_PMC_MOSCEN);
 }
 
 static const struct clk_ops main_osc_ops = {
@@ -139,18 +129,16 @@ static const struct clk_ops main_osc_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_main_osc(struct at91_pmc *pmc,
-                          unsigned int irq,
+at91_clk_register_main_osc(struct regmap *regmap,
                           const char *name,
                           const char *parent_name,
                           bool bypass)
 {
-       int ret;
        struct clk_main_osc *osc;
        struct clk *clk = NULL;
        struct clk_init_data init;
 
-       if (!pmc || !irq || !name || !parent_name)
+       if (!name || !parent_name)
                return ERR_PTR(-EINVAL);
 
        osc = kzalloc(sizeof(*osc), GFP_KERNEL);
@@ -164,85 +152,70 @@ at91_clk_register_main_osc(struct at91_pmc *pmc,
        init.flags = CLK_IGNORE_UNUSED;
 
        osc->hw.init = &init;
-       osc->pmc = pmc;
-       osc->irq = irq;
-
-       init_waitqueue_head(&osc->wait);
-       irq_set_status_flags(osc->irq, IRQ_NOAUTOEN);
-       ret = request_irq(osc->irq, clk_main_osc_irq_handler,
-                         IRQF_TRIGGER_HIGH, name, osc);
-       if (ret) {
-               kfree(osc);
-               return ERR_PTR(ret);
-       }
+       osc->regmap = regmap;
 
        if (bypass)
-               pmc_write(pmc, AT91_CKGR_MOR,
-                         (pmc_read(pmc, AT91_CKGR_MOR) &
-                          ~(MOR_KEY_MASK | AT91_PMC_MOSCEN)) |
-                         AT91_PMC_OSCBYPASS | AT91_PMC_KEY);
+               regmap_update_bits(regmap,
+                                  AT91_CKGR_MOR, MOR_KEY_MASK |
+                                  AT91_PMC_MOSCEN,
+                                  AT91_PMC_OSCBYPASS | AT91_PMC_KEY);
 
        clk = clk_register(NULL, &osc->hw);
-       if (IS_ERR(clk)) {
-               free_irq(irq, osc);
+       if (IS_ERR(clk))
                kfree(osc);
-       }
 
        return clk;
 }
 
-void __init of_at91rm9200_clk_main_osc_setup(struct device_node *np,
-                                            struct at91_pmc *pmc)
+static void __init of_at91rm9200_clk_main_osc_setup(struct device_node *np)
 {
        struct clk *clk;
-       unsigned int irq;
        const char *name = np->name;
        const char *parent_name;
+       struct regmap *regmap;
        bool bypass;
 
        of_property_read_string(np, "clock-output-names", &name);
        bypass = of_property_read_bool(np, "atmel,osc-bypass");
        parent_name = of_clk_get_parent_name(np, 0);
 
-       irq = irq_of_parse_and_map(np, 0);
-       if (!irq)
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
                return;
 
-       clk = at91_clk_register_main_osc(pmc, irq, name, parent_name, bypass);
+       clk = at91_clk_register_main_osc(regmap, name, parent_name, bypass);
        if (IS_ERR(clk))
                return;
 
        of_clk_add_provider(np, of_clk_src_simple_get, clk);
 }
+CLK_OF_DECLARE(at91rm9200_clk_main_osc, "atmel,at91rm9200-clk-main-osc",
+              of_at91rm9200_clk_main_osc_setup);
 
-static irqreturn_t clk_main_rc_osc_irq_handler(int irq, void *dev_id)
+static bool clk_main_rc_osc_ready(struct regmap *regmap)
 {
-       struct clk_main_rc_osc *osc = dev_id;
+       unsigned int status;
 
-       wake_up(&osc->wait);
-       disable_irq_nosync(osc->irq);
+       regmap_read(regmap, AT91_PMC_SR, &status);
 
-       return IRQ_HANDLED;
+       return status & AT91_PMC_MOSCRCS;
 }
 
 static int clk_main_rc_osc_prepare(struct clk_hw *hw)
 {
        struct clk_main_rc_osc *osc = to_clk_main_rc_osc(hw);
-       struct at91_pmc *pmc = osc->pmc;
-       u32 tmp;
+       struct regmap *regmap = osc->regmap;
+       unsigned int mor;
 
-       tmp = pmc_read(pmc, AT91_CKGR_MOR) & ~MOR_KEY_MASK;
+       regmap_read(regmap, AT91_CKGR_MOR, &mor);
 
-       if (!(tmp & AT91_PMC_MOSCRCEN)) {
-               tmp |= AT91_PMC_MOSCRCEN | AT91_PMC_KEY;
-               pmc_write(pmc, AT91_CKGR_MOR, tmp);
-       }
+       if (!(mor & AT91_PMC_MOSCRCEN))
+               regmap_update_bits(regmap, AT91_CKGR_MOR,
+                                  MOR_KEY_MASK | AT91_PMC_MOSCRCEN,
+                                  AT91_PMC_MOSCRCEN | AT91_PMC_KEY);
 
-       while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCRCS)) {
-               enable_irq(osc->irq);
-               wait_event(osc->wait,
-                          pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCRCS);
-       }
+       while (!clk_main_rc_osc_ready(regmap))
+               cpu_relax();
 
        return 0;
 }
@@ -250,23 +223,28 @@ static int clk_main_rc_osc_prepare(struct clk_hw *hw)
 static void clk_main_rc_osc_unprepare(struct clk_hw *hw)
 {
        struct clk_main_rc_osc *osc = to_clk_main_rc_osc(hw);
-       struct at91_pmc *pmc = osc->pmc;
-       u32 tmp = pmc_read(pmc, AT91_CKGR_MOR);
+       struct regmap *regmap = osc->regmap;
+       unsigned int mor;
+
+       regmap_read(regmap, AT91_CKGR_MOR, &mor);
 
-       if (!(tmp & AT91_PMC_MOSCRCEN))
+       if (!(mor & AT91_PMC_MOSCRCEN))
                return;
 
-       tmp &= ~(MOR_KEY_MASK | AT91_PMC_MOSCRCEN);
-       pmc_write(pmc, AT91_CKGR_MOR, tmp | AT91_PMC_KEY);
+       regmap_update_bits(regmap, AT91_CKGR_MOR,
+                          MOR_KEY_MASK | AT91_PMC_MOSCRCEN, AT91_PMC_KEY);
 }
 
 static int clk_main_rc_osc_is_prepared(struct clk_hw *hw)
 {
        struct clk_main_rc_osc *osc = to_clk_main_rc_osc(hw);
-       struct at91_pmc *pmc = osc->pmc;
+       struct regmap *regmap = osc->regmap;
+       unsigned int mor, status;
 
-       return !!((pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCRCS) &&
-                 (pmc_read(pmc, AT91_CKGR_MOR) & AT91_PMC_MOSCRCEN));
+       regmap_read(regmap, AT91_CKGR_MOR, &mor);
+       regmap_read(regmap, AT91_PMC_SR, &status);
+
+       return (mor & AT91_PMC_MOSCRCEN) && (status & AT91_PMC_MOSCRCS);
 }
 
 static unsigned long clk_main_rc_osc_recalc_rate(struct clk_hw *hw,
@@ -294,17 +272,15 @@ static const struct clk_ops main_rc_osc_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_main_rc_osc(struct at91_pmc *pmc,
-                             unsigned int irq,
+at91_clk_register_main_rc_osc(struct regmap *regmap,
                              const char *name,
                              u32 frequency, u32 accuracy)
 {
-       int ret;
        struct clk_main_rc_osc *osc;
        struct clk *clk = NULL;
        struct clk_init_data init;
 
-       if (!pmc || !irq || !name || !frequency)
+       if (!name || !frequency)
                return ERR_PTR(-EINVAL);
 
        osc = kzalloc(sizeof(*osc), GFP_KERNEL);
@@ -318,63 +294,53 @@ at91_clk_register_main_rc_osc(struct at91_pmc *pmc,
        init.flags = CLK_IS_ROOT | CLK_IGNORE_UNUSED;
 
        osc->hw.init = &init;
-       osc->pmc = pmc;
-       osc->irq = irq;
+       osc->regmap = regmap;
        osc->frequency = frequency;
        osc->accuracy = accuracy;
 
-       init_waitqueue_head(&osc->wait);
-       irq_set_status_flags(osc->irq, IRQ_NOAUTOEN);
-       ret = request_irq(osc->irq, clk_main_rc_osc_irq_handler,
-                         IRQF_TRIGGER_HIGH, name, osc);
-       if (ret)
-               return ERR_PTR(ret);
-
        clk = clk_register(NULL, &osc->hw);
-       if (IS_ERR(clk)) {
-               free_irq(irq, osc);
+       if (IS_ERR(clk))
                kfree(osc);
-       }
 
        return clk;
 }
 
-void __init of_at91sam9x5_clk_main_rc_osc_setup(struct device_node *np,
-                                               struct at91_pmc *pmc)
+static void __init of_at91sam9x5_clk_main_rc_osc_setup(struct device_node *np)
 {
        struct clk *clk;
-       unsigned int irq;
        u32 frequency = 0;
        u32 accuracy = 0;
        const char *name = np->name;
+       struct regmap *regmap;
 
        of_property_read_string(np, "clock-output-names", &name);
        of_property_read_u32(np, "clock-frequency", &frequency);
        of_property_read_u32(np, "clock-accuracy", &accuracy);
 
-       irq = irq_of_parse_and_map(np, 0);
-       if (!irq)
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
                return;
 
-       clk = at91_clk_register_main_rc_osc(pmc, irq, name, frequency,
-                                           accuracy);
+       clk = at91_clk_register_main_rc_osc(regmap, name, frequency, accuracy);
        if (IS_ERR(clk))
                return;
 
        of_clk_add_provider(np, of_clk_src_simple_get, clk);
 }
+CLK_OF_DECLARE(at91sam9x5_clk_main_rc_osc, "atmel,at91sam9x5-clk-main-rc-osc",
+              of_at91sam9x5_clk_main_rc_osc_setup);
 
 
-static int clk_main_probe_frequency(struct at91_pmc *pmc)
+static int clk_main_probe_frequency(struct regmap *regmap)
 {
        unsigned long prep_time, timeout;
-       u32 tmp;
+       unsigned int mcfr;
 
        timeout = jiffies + usecs_to_jiffies(MAINFRDY_TIMEOUT);
        do {
                prep_time = jiffies;
-               tmp = pmc_read(pmc, AT91_CKGR_MCFR);
-               if (tmp & AT91_PMC_MAINRDY)
+               regmap_read(regmap, AT91_CKGR_MCFR, &mcfr);
+               if (mcfr & AT91_PMC_MAINRDY)
                        return 0;
                usleep_range(MAINF_LOOP_MIN_WAIT, MAINF_LOOP_MAX_WAIT);
        } while (time_before(prep_time, timeout));
@@ -382,34 +348,37 @@ static int clk_main_probe_frequency(struct at91_pmc *pmc)
        return -ETIMEDOUT;
 }
 
-static unsigned long clk_main_recalc_rate(struct at91_pmc *pmc,
+static unsigned long clk_main_recalc_rate(struct regmap *regmap,
                                          unsigned long parent_rate)
 {
-       u32 tmp;
+       unsigned int mcfr;
 
        if (parent_rate)
                return parent_rate;
 
        pr_warn("Main crystal frequency not set, using approximate value\n");
-       tmp = pmc_read(pmc, AT91_CKGR_MCFR);
-       if (!(tmp & AT91_PMC_MAINRDY))
+       regmap_read(regmap, AT91_CKGR_MCFR, &mcfr);
+       if (!(mcfr & AT91_PMC_MAINRDY))
                return 0;
 
-       return ((tmp & AT91_PMC_MAINF) * SLOW_CLOCK_FREQ) / MAINF_DIV;
+       return ((mcfr & AT91_PMC_MAINF) * SLOW_CLOCK_FREQ) / MAINF_DIV;
 }
 
 static int clk_rm9200_main_prepare(struct clk_hw *hw)
 {
        struct clk_rm9200_main *clkmain = to_clk_rm9200_main(hw);
 
-       return clk_main_probe_frequency(clkmain->pmc);
+       return clk_main_probe_frequency(clkmain->regmap);
 }
 
 static int clk_rm9200_main_is_prepared(struct clk_hw *hw)
 {
        struct clk_rm9200_main *clkmain = to_clk_rm9200_main(hw);
+       unsigned int status;
+
+       regmap_read(clkmain->regmap, AT91_CKGR_MCFR, &status);
 
-       return !!(pmc_read(clkmain->pmc, AT91_CKGR_MCFR) & AT91_PMC_MAINRDY);
+       return status & AT91_PMC_MAINRDY ? 1 : 0;
 }
 
 static unsigned long clk_rm9200_main_recalc_rate(struct clk_hw *hw,
@@ -417,7 +386,7 @@ static unsigned long clk_rm9200_main_recalc_rate(struct clk_hw *hw,
 {
        struct clk_rm9200_main *clkmain = to_clk_rm9200_main(hw);
 
-       return clk_main_recalc_rate(clkmain->pmc, parent_rate);
+       return clk_main_recalc_rate(clkmain->regmap, parent_rate);
 }
 
 static const struct clk_ops rm9200_main_ops = {
@@ -427,7 +396,7 @@ static const struct clk_ops rm9200_main_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_rm9200_main(struct at91_pmc *pmc,
+at91_clk_register_rm9200_main(struct regmap *regmap,
                              const char *name,
                              const char *parent_name)
 {
@@ -435,7 +404,7 @@ at91_clk_register_rm9200_main(struct at91_pmc *pmc,
        struct clk *clk = NULL;
        struct clk_init_data init;
 
-       if (!pmc || !name)
+       if (!name)
                return ERR_PTR(-EINVAL);
 
        if (!parent_name)
@@ -452,7 +421,7 @@ at91_clk_register_rm9200_main(struct at91_pmc *pmc,
        init.flags = 0;
 
        clkmain->hw.init = &init;
-       clkmain->pmc = pmc;
+       clkmain->regmap = regmap;
 
        clk = clk_register(NULL, &clkmain->hw);
        if (IS_ERR(clk))
@@ -461,52 +430,54 @@ at91_clk_register_rm9200_main(struct at91_pmc *pmc,
        return clk;
 }
 
-void __init of_at91rm9200_clk_main_setup(struct device_node *np,
-                                        struct at91_pmc *pmc)
+static void __init of_at91rm9200_clk_main_setup(struct device_node *np)
 {
        struct clk *clk;
        const char *parent_name;
        const char *name = np->name;
+       struct regmap *regmap;
 
        parent_name = of_clk_get_parent_name(np, 0);
        of_property_read_string(np, "clock-output-names", &name);
 
-       clk = at91_clk_register_rm9200_main(pmc, name, parent_name);
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
+
+       clk = at91_clk_register_rm9200_main(regmap, name, parent_name);
        if (IS_ERR(clk))
                return;
 
        of_clk_add_provider(np, of_clk_src_simple_get, clk);
 }
+CLK_OF_DECLARE(at91rm9200_clk_main, "atmel,at91rm9200-clk-main",
+              of_at91rm9200_clk_main_setup);
 
-static irqreturn_t clk_sam9x5_main_irq_handler(int irq, void *dev_id)
+static inline bool clk_sam9x5_main_ready(struct regmap *regmap)
 {
-       struct clk_sam9x5_main *clkmain = dev_id;
+       unsigned int status;
 
-       wake_up(&clkmain->wait);
-       disable_irq_nosync(clkmain->irq);
+       regmap_read(regmap, AT91_PMC_SR, &status);
 
-       return IRQ_HANDLED;
+       return status & AT91_PMC_MOSCSELS ? 1 : 0;
 }
 
 static int clk_sam9x5_main_prepare(struct clk_hw *hw)
 {
        struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
-       struct at91_pmc *pmc = clkmain->pmc;
+       struct regmap *regmap = clkmain->regmap;
 
-       while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCSELS)) {
-               enable_irq(clkmain->irq);
-               wait_event(clkmain->wait,
-                          pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCSELS);
-       }
+       while (!clk_sam9x5_main_ready(regmap))
+               cpu_relax();
 
-       return clk_main_probe_frequency(pmc);
+       return clk_main_probe_frequency(regmap);
 }
 
 static int clk_sam9x5_main_is_prepared(struct clk_hw *hw)
 {
        struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
 
-       return !!(pmc_read(clkmain->pmc, AT91_PMC_SR) & AT91_PMC_MOSCSELS);
+       return clk_sam9x5_main_ready(clkmain->regmap);
 }
 
 static unsigned long clk_sam9x5_main_recalc_rate(struct clk_hw *hw,
@@ -514,30 +485,28 @@ static unsigned long clk_sam9x5_main_recalc_rate(struct clk_hw *hw,
 {
        struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
 
-       return clk_main_recalc_rate(clkmain->pmc, parent_rate);
+       return clk_main_recalc_rate(clkmain->regmap, parent_rate);
 }
 
 static int clk_sam9x5_main_set_parent(struct clk_hw *hw, u8 index)
 {
        struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
-       struct at91_pmc *pmc = clkmain->pmc;
-       u32 tmp;
+       struct regmap *regmap = clkmain->regmap;
+       unsigned int tmp;
 
        if (index > 1)
                return -EINVAL;
 
-       tmp = pmc_read(pmc, AT91_CKGR_MOR) & ~MOR_KEY_MASK;
+       regmap_read(regmap, AT91_CKGR_MOR, &tmp);
+       tmp &= ~MOR_KEY_MASK;
 
        if (index && !(tmp & AT91_PMC_MOSCSEL))
-               pmc_write(pmc, AT91_CKGR_MOR, tmp | AT91_PMC_MOSCSEL);
+               regmap_write(regmap, AT91_CKGR_MOR, tmp | AT91_PMC_MOSCSEL);
        else if (!index && (tmp & AT91_PMC_MOSCSEL))
-               pmc_write(pmc, AT91_CKGR_MOR, tmp & ~AT91_PMC_MOSCSEL);
+               regmap_write(regmap, AT91_CKGR_MOR, tmp & ~AT91_PMC_MOSCSEL);
 
-       while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCSELS)) {
-               enable_irq(clkmain->irq);
-               wait_event(clkmain->wait,
-                          pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCSELS);
-       }
+       while (!clk_sam9x5_main_ready(regmap))
+               cpu_relax();
 
        return 0;
 }
@@ -545,8 +514,11 @@ static int clk_sam9x5_main_set_parent(struct clk_hw *hw, u8 index)
 static u8 clk_sam9x5_main_get_parent(struct clk_hw *hw)
 {
        struct clk_sam9x5_main *clkmain = to_clk_sam9x5_main(hw);
+       unsigned int status;
+
+       regmap_read(clkmain->regmap, AT91_CKGR_MOR, &status);
 
-       return !!(pmc_read(clkmain->pmc, AT91_CKGR_MOR) & AT91_PMC_MOSCEN);
+       return status & AT91_PMC_MOSCEN ? 1 : 0;
 }
 
 static const struct clk_ops sam9x5_main_ops = {
@@ -558,18 +530,17 @@ static const struct clk_ops sam9x5_main_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_sam9x5_main(struct at91_pmc *pmc,
-                             unsigned int irq,
+at91_clk_register_sam9x5_main(struct regmap *regmap,
                              const char *name,
                              const char **parent_names,
                              int num_parents)
 {
-       int ret;
        struct clk_sam9x5_main *clkmain;
        struct clk *clk = NULL;
        struct clk_init_data init;
+       unsigned int status;
 
-       if (!pmc || !irq || !name)
+       if (!name)
                return ERR_PTR(-EINVAL);
 
        if (!parent_names || !num_parents)
@@ -586,51 +557,42 @@ at91_clk_register_sam9x5_main(struct at91_pmc *pmc,
        init.flags = CLK_SET_PARENT_GATE;
 
        clkmain->hw.init = &init;
-       clkmain->pmc = pmc;
-       clkmain->irq = irq;
-       clkmain->parent = !!(pmc_read(clkmain->pmc, AT91_CKGR_MOR) &
-                            AT91_PMC_MOSCEN);
-       init_waitqueue_head(&clkmain->wait);
-       irq_set_status_flags(clkmain->irq, IRQ_NOAUTOEN);
-       ret = request_irq(clkmain->irq, clk_sam9x5_main_irq_handler,
-                         IRQF_TRIGGER_HIGH, name, clkmain);
-       if (ret)
-               return ERR_PTR(ret);
+       clkmain->regmap = regmap;
+       regmap_read(clkmain->regmap, AT91_CKGR_MOR, &status);
+       clkmain->parent = status & AT91_PMC_MOSCEN ? 1 : 0;
 
        clk = clk_register(NULL, &clkmain->hw);
-       if (IS_ERR(clk)) {
-               free_irq(clkmain->irq, clkmain);
+       if (IS_ERR(clk))
                kfree(clkmain);
-       }
 
        return clk;
 }
 
-void __init of_at91sam9x5_clk_main_setup(struct device_node *np,
-                                        struct at91_pmc *pmc)
+static void __init of_at91sam9x5_clk_main_setup(struct device_node *np)
 {
        struct clk *clk;
        const char *parent_names[2];
        int num_parents;
-       unsigned int irq;
        const char *name = np->name;
+       struct regmap *regmap;
 
        num_parents = of_clk_get_parent_count(np);
        if (num_parents <= 0 || num_parents > 2)
                return;
 
        of_clk_parent_fill(np, parent_names, num_parents);
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
 
        of_property_read_string(np, "clock-output-names", &name);
 
-       irq = irq_of_parse_and_map(np, 0);
-       if (!irq)
-               return;
-
-       clk = at91_clk_register_sam9x5_main(pmc, irq, name, parent_names,
+       clk = at91_clk_register_sam9x5_main(regmap, name, parent_names,
                                            num_parents);
        if (IS_ERR(clk))
                return;
 
        of_clk_add_provider(np, of_clk_src_simple_get, clk);
 }
+CLK_OF_DECLARE(at91sam9x5_clk_main, "atmel,at91sam9x5-clk-main",
+              of_at91sam9x5_clk_main_setup);
diff --git a/drivers/clk/at91/clk-master.c b/drivers/clk/at91/clk-master.c
index 620ea323356b..7d4a1864ea7c 100644
--- a/drivers/clk/at91/clk-master.c
+++ b/drivers/clk/at91/clk-master.c
@@ -12,13 +12,8 @@
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/io.h>
-#include <linux/wait.h>
-#include <linux/sched.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include "pmc.h"
 
@@ -44,32 +39,26 @@ struct clk_master_layout {
 
 struct clk_master {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
-       unsigned int irq;
-       wait_queue_head_t wait;
+       struct regmap *regmap;
        const struct clk_master_layout *layout;
        const struct clk_master_characteristics *characteristics;
 };
 
-static irqreturn_t clk_master_irq_handler(int irq, void *dev_id)
+static inline bool clk_master_ready(struct regmap *regmap)
 {
-       struct clk_master *master = (struct clk_master *)dev_id;
+       unsigned int status;
 
-       wake_up(&master->wait);
-       disable_irq_nosync(master->irq);
+       regmap_read(regmap, AT91_PMC_SR, &status);
 
-       return IRQ_HANDLED;
+       return status & AT91_PMC_MCKRDY ? 1 : 0;
 }
+
 static int clk_master_prepare(struct clk_hw *hw)
 {
        struct clk_master *master = to_clk_master(hw);
-       struct at91_pmc *pmc = master->pmc;
 
-       while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY)) {
-               enable_irq(master->irq);
-               wait_event(master->wait,
-                          pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY);
-       }
+       while (!clk_master_ready(master->regmap))
+               cpu_relax();
 
        return 0;
 }
@@ -78,7 +67,7 @@ static int clk_master_is_prepared(struct clk_hw *hw)
 {
        struct clk_master *master = to_clk_master(hw);
 
-       return !!(pmc_read(master->pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY);
+       return clk_master_ready(master->regmap);
 }
 
 static unsigned long clk_master_recalc_rate(struct clk_hw *hw,
@@ -88,18 +77,16 @@ static unsigned long clk_master_recalc_rate(struct clk_hw *hw,
        u8 div;
        unsigned long rate = parent_rate;
        struct clk_master *master = to_clk_master(hw);
-       struct at91_pmc *pmc = master->pmc;
        const struct clk_master_layout *layout = master->layout;
        const struct clk_master_characteristics *characteristics =
                                                master->characteristics;
-       u32 tmp;
+       unsigned int mckr;
 
-       pmc_lock(pmc);
-       tmp = pmc_read(pmc, AT91_PMC_MCKR) & layout->mask;
-       pmc_unlock(pmc);
+       regmap_read(master->regmap, AT91_PMC_MCKR, &mckr);
+       mckr &= layout->mask;
 
-       pres = (tmp >> layout->pres_shift) & MASTER_PRES_MASK;
-       div = (tmp >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
+       pres = (mckr >> layout->pres_shift) & MASTER_PRES_MASK;
+       div = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
 
        if (characteristics->have_div3_pres && pres == MASTER_PRES_MAX)
                rate /= 3;
@@ -119,9 +106,11 @@ static unsigned long clk_master_recalc_rate(struct clk_hw *hw,
 static u8 clk_master_get_parent(struct clk_hw *hw)
 {
        struct clk_master *master = to_clk_master(hw);
-       struct at91_pmc *pmc = master->pmc;
+       unsigned int mckr;
 
-       return pmc_read(pmc, AT91_PMC_MCKR) & AT91_PMC_CSS;
+       regmap_read(master->regmap, AT91_PMC_MCKR, &mckr);
+
+       return mckr & AT91_PMC_CSS;
 }
 
 static const struct clk_ops master_ops = {
@@ -132,18 +121,17 @@ static const struct clk_ops master_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_master(struct at91_pmc *pmc, unsigned int irq,
+at91_clk_register_master(struct regmap *regmap,
                const char *name, int num_parents,
                const char **parent_names,
                const struct clk_master_layout *layout,
                const struct clk_master_characteristics *characteristics)
 {
-       int ret;
        struct clk_master *master;
        struct clk *clk = NULL;
        struct clk_init_data init;
 
-       if (!pmc || !irq || !name || !num_parents || !parent_names)
+       if (!name || !num_parents || !parent_names)
                return ERR_PTR(-EINVAL);
 
        master = kzalloc(sizeof(*master), GFP_KERNEL);
@@ -159,20 +147,10 @@ at91_clk_register_master(struct at91_pmc *pmc, unsigned int irq,
        master->hw.init = &init;
        master->layout = layout;
        master->characteristics = characteristics;
-       master->pmc = pmc;
-       master->irq = irq;
-       init_waitqueue_head(&master->wait);
-       irq_set_status_flags(master->irq, IRQ_NOAUTOEN);
-       ret = request_irq(master->irq, clk_master_irq_handler,
-                         IRQF_TRIGGER_HIGH, "clk-master", master);
-       if (ret) {
-               kfree(master);
-               return ERR_PTR(ret);
-       }
+       master->regmap = regmap;
 
        clk = clk_register(NULL, &master->hw);
        if (IS_ERR(clk)) {
-               free_irq(master->irq, master);
                kfree(master);
        }
 
@@ -217,15 +195,15 @@ of_at91_clk_master_get_characteristics(struct device_node *np)
 }
 
 static void __init
-of_at91_clk_master_setup(struct device_node *np, struct at91_pmc *pmc,
+of_at91_clk_master_setup(struct device_node *np,
                         const struct clk_master_layout *layout)
 {
        struct clk *clk;
        int num_parents;
-       unsigned int irq;
        const char *parent_names[MASTER_SOURCE_MAX];
        const char *name = np->name;
        struct clk_master_characteristics *characteristics;
+       struct regmap *regmap;
 
        num_parents = of_clk_get_parent_count(np);
        if (num_parents <= 0 || num_parents > MASTER_SOURCE_MAX)
@@ -239,11 +217,11 @@ of_at91_clk_master_setup(struct device_node *np, struct at91_pmc *pmc,
        if (!characteristics)
                return;
 
-       irq = irq_of_parse_and_map(np, 0);
-       if (!irq)
-               goto out_free_characteristics;
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
 
-       clk = at91_clk_register_master(pmc, irq, name, num_parents,
+       clk = at91_clk_register_master(regmap, name, num_parents,
                                       parent_names, layout,
                                       characteristics);
        if (IS_ERR(clk))
@@ -256,14 +234,16 @@ of_at91_clk_master_setup(struct device_node *np, struct at91_pmc *pmc,
        kfree(characteristics);
 }
 
-void __init of_at91rm9200_clk_master_setup(struct device_node *np,
-                                          struct at91_pmc *pmc)
+static void __init of_at91rm9200_clk_master_setup(struct device_node *np)
 {
-       of_at91_clk_master_setup(np, pmc, &at91rm9200_master_layout);
+       of_at91_clk_master_setup(np, &at91rm9200_master_layout);
 }
+CLK_OF_DECLARE(at91rm9200_clk_master, "atmel,at91rm9200-clk-master",
+              of_at91rm9200_clk_master_setup);
 
-void __init of_at91sam9x5_clk_master_setup(struct device_node *np,
-                                          struct at91_pmc *pmc)
+static void __init of_at91sam9x5_clk_master_setup(struct device_node *np)
 {
-       of_at91_clk_master_setup(np, pmc, &at91sam9x5_master_layout);
+       of_at91_clk_master_setup(np, &at91sam9x5_master_layout);
 }
+CLK_OF_DECLARE(at91sam9x5_clk_master, "atmel,at91sam9x5-clk-master",
+              of_at91sam9x5_clk_master_setup);
diff --git a/drivers/clk/at91/clk-peripheral.c b/drivers/clk/at91/clk-peripheral.c
index 58f3b568e9cb..d69cd2a121b1 100644
--- a/drivers/clk/at91/clk-peripheral.c
+++ b/drivers/clk/at91/clk-peripheral.c
@@ -12,11 +12,13 @@
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include "pmc.h"
 
+DEFINE_SPINLOCK(pmc_pcr_lock);
+
 #define PERIPHERAL_MAX         64
 
 #define PERIPHERAL_AT91RM9200  0
@@ -33,7 +35,7 @@
 
 struct clk_peripheral {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
+       struct regmap *regmap;
        u32 id;
 };
 
@@ -41,8 +43,9 @@ struct clk_peripheral {
 
 struct clk_sam9x5_peripheral {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
+       struct regmap *regmap;
        struct clk_range range;
+       spinlock_t *lock;
        u32 id;
        u32 div;
        bool auto_div;
@@ -54,7 +57,6 @@ struct clk_sam9x5_peripheral {
 static int clk_peripheral_enable(struct clk_hw *hw)
 {
        struct clk_peripheral *periph = to_clk_peripheral(hw);
-       struct at91_pmc *pmc = periph->pmc;
        int offset = AT91_PMC_PCER;
        u32 id = periph->id;
 
@@ -62,14 +64,14 @@ static int clk_peripheral_enable(struct clk_hw *hw)
                return 0;
        if (id > PERIPHERAL_ID_MAX)
                offset = AT91_PMC_PCER1;
-       pmc_write(pmc, offset, PERIPHERAL_MASK(id));
+       regmap_write(periph->regmap, offset, PERIPHERAL_MASK(id));
+
        return 0;
 }
 
 static void clk_peripheral_disable(struct clk_hw *hw)
 {
        struct clk_peripheral *periph = to_clk_peripheral(hw);
-       struct at91_pmc *pmc = periph->pmc;
        int offset = AT91_PMC_PCDR;
        u32 id = periph->id;
 
@@ -77,21 +79,23 @@ static void clk_peripheral_disable(struct clk_hw *hw)
                return;
        if (id > PERIPHERAL_ID_MAX)
                offset = AT91_PMC_PCDR1;
-       pmc_write(pmc, offset, PERIPHERAL_MASK(id));
+       regmap_write(periph->regmap, offset, PERIPHERAL_MASK(id));
 }
 
 static int clk_peripheral_is_enabled(struct clk_hw *hw)
 {
        struct clk_peripheral *periph = to_clk_peripheral(hw);
-       struct at91_pmc *pmc = periph->pmc;
        int offset = AT91_PMC_PCSR;
+       unsigned int status;
        u32 id = periph->id;
 
        if (id < PERIPHERAL_ID_MIN)
                return 1;
        if (id > PERIPHERAL_ID_MAX)
                offset = AT91_PMC_PCSR1;
-       return !!(pmc_read(pmc, offset) & PERIPHERAL_MASK(id));
+       regmap_read(periph->regmap, offset, &status);
+
+       return status & PERIPHERAL_MASK(id) ? 1 : 0;
 }
 
 static const struct clk_ops peripheral_ops = {
@@ -101,14 +105,14 @@ static const struct clk_ops peripheral_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_peripheral(struct at91_pmc *pmc, const char *name,
+at91_clk_register_peripheral(struct regmap *regmap, const char *name,
                             const char *parent_name, u32 id)
 {
        struct clk_peripheral *periph;
        struct clk *clk = NULL;
        struct clk_init_data init;
 
-       if (!pmc || !name || !parent_name || id > PERIPHERAL_ID_MAX)
+       if (!name || !parent_name || id > PERIPHERAL_ID_MAX)
                return ERR_PTR(-EINVAL);
 
        periph = kzalloc(sizeof(*periph), GFP_KERNEL);
@@ -123,7 +127,7 @@ at91_clk_register_peripheral(struct at91_pmc *pmc, const char *name,
 
        periph->id = id;
        periph->hw.init = &init;
-       periph->pmc = pmc;
+       periph->regmap = regmap;
 
        clk = clk_register(NULL, &periph->hw);
        if (IS_ERR(clk))
@@ -160,53 +164,58 @@ static void clk_sam9x5_peripheral_autodiv(struct clk_sam9x5_peripheral *periph)
 static int clk_sam9x5_peripheral_enable(struct clk_hw *hw)
 {
        struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
-       struct at91_pmc *pmc = periph->pmc;
-       u32 tmp;
+       unsigned long flags;
 
        if (periph->id < PERIPHERAL_ID_MIN)
                return 0;
 
-       pmc_lock(pmc);
-       pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID_MASK));
-       tmp = pmc_read(pmc, AT91_PMC_PCR) & ~AT91_PMC_PCR_DIV_MASK;
-       pmc_write(pmc, AT91_PMC_PCR, tmp | AT91_PMC_PCR_DIV(periph->div)
-                                        | AT91_PMC_PCR_CMD
-                                        | AT91_PMC_PCR_EN);
-       pmc_unlock(pmc);
+       spin_lock_irqsave(periph->lock, flags);
+       regmap_write(periph->regmap, AT91_PMC_PCR,
+                    (periph->id & AT91_PMC_PCR_PID_MASK));
+       regmap_update_bits(periph->regmap, AT91_PMC_PCR,
+                          AT91_PMC_PCR_DIV_MASK | AT91_PMC_PCR_CMD |
+                          AT91_PMC_PCR_EN,
+                          AT91_PMC_PCR_DIV(periph->div) |
+                          AT91_PMC_PCR_CMD |
+                          AT91_PMC_PCR_EN);
+       spin_unlock_irqrestore(periph->lock, flags);
+
        return 0;
 }
 
 static void clk_sam9x5_peripheral_disable(struct clk_hw *hw)
 {
        struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
-       struct at91_pmc *pmc = periph->pmc;
-       u32 tmp;
+       unsigned long flags;
 
        if (periph->id < PERIPHERAL_ID_MIN)
                return;
 
-       pmc_lock(pmc);
-       pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID_MASK));
-       tmp = pmc_read(pmc, AT91_PMC_PCR) & ~AT91_PMC_PCR_EN;
-       pmc_write(pmc, AT91_PMC_PCR, tmp | AT91_PMC_PCR_CMD);
-       pmc_unlock(pmc);
+       spin_lock_irqsave(periph->lock, flags);
+       regmap_write(periph->regmap, AT91_PMC_PCR,
+                    (periph->id & AT91_PMC_PCR_PID_MASK));
+       regmap_update_bits(periph->regmap, AT91_PMC_PCR,
+                          AT91_PMC_PCR_EN | AT91_PMC_PCR_CMD,
+                          AT91_PMC_PCR_CMD);
+       spin_unlock_irqrestore(periph->lock, flags);
 }
 
 static int clk_sam9x5_peripheral_is_enabled(struct clk_hw *hw)
 {
        struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
-       struct at91_pmc *pmc = periph->pmc;
-       int ret;
+       unsigned long flags;
+       unsigned int status;
 
        if (periph->id < PERIPHERAL_ID_MIN)
                return 1;
 
-       pmc_lock(pmc);
-       pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID_MASK));
-       ret = !!(pmc_read(pmc, AT91_PMC_PCR) & AT91_PMC_PCR_EN);
-       pmc_unlock(pmc);
+       spin_lock_irqsave(periph->lock, flags);
+       regmap_write(periph->regmap, AT91_PMC_PCR,
+                    (periph->id & AT91_PMC_PCR_PID_MASK));
+       regmap_read(periph->regmap, AT91_PMC_PCR, &status);
+       spin_unlock_irqrestore(periph->lock, flags);
 
-       return ret;
+       return status & AT91_PMC_PCR_EN ? 1 : 0;
 }
 
 static unsigned long
@@ -214,19 +223,20 @@ clk_sam9x5_peripheral_recalc_rate(struct clk_hw *hw,
                                  unsigned long parent_rate)
 {
        struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
-       struct at91_pmc *pmc = periph->pmc;
-       u32 tmp;
+       unsigned long flags;
+       unsigned int status;
 
        if (periph->id < PERIPHERAL_ID_MIN)
                return parent_rate;
 
-       pmc_lock(pmc);
-       pmc_write(pmc, AT91_PMC_PCR, (periph->id & AT91_PMC_PCR_PID_MASK));
-       tmp = pmc_read(pmc, AT91_PMC_PCR);
-       pmc_unlock(pmc);
+       spin_lock_irqsave(periph->lock, flags);
+       regmap_write(periph->regmap, AT91_PMC_PCR,
+                    (periph->id & AT91_PMC_PCR_PID_MASK));
+       regmap_read(periph->regmap, AT91_PMC_PCR, &status);
+       spin_unlock_irqrestore(periph->lock, flags);
 
-       if (tmp & AT91_PMC_PCR_EN) {
-               periph->div = PERIPHERAL_RSHIFT(tmp);
+       if (status & AT91_PMC_PCR_EN) {
+               periph->div = PERIPHERAL_RSHIFT(status);
                periph->auto_div = false;
        } else {
                clk_sam9x5_peripheral_autodiv(periph);
@@ -318,15 +328,15 @@ static const struct clk_ops sam9x5_peripheral_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_sam9x5_peripheral(struct at91_pmc *pmc, const char *name,
-                                   const char *parent_name, u32 id,
-                                   const struct clk_range *range)
+at91_clk_register_sam9x5_peripheral(struct regmap *regmap, spinlock_t *lock,
+                                   const char *name, const char *parent_name,
+                                   u32 id, const struct clk_range *range)
 {
        struct clk_sam9x5_peripheral *periph;
        struct clk *clk = NULL;
        struct clk_init_data init;
 
-       if (!pmc || !name || !parent_name)
+       if (!name || !parent_name)
                return ERR_PTR(-EINVAL);
 
        periph = kzalloc(sizeof(*periph), GFP_KERNEL);
@@ -342,7 +352,8 @@ at91_clk_register_sam9x5_peripheral(struct at91_pmc *pmc, const char *name,
        periph->id = id;
        periph->hw.init = &init;
        periph->div = 0;
-       periph->pmc = pmc;
+       periph->regmap = regmap;
+       periph->lock = lock;
        periph->auto_div = true;
        periph->range = *range;
 
@@ -356,7 +367,7 @@ at91_clk_register_sam9x5_peripheral(struct at91_pmc *pmc, const char *name,
 }
 
 static void __init
-of_at91_clk_periph_setup(struct device_node *np, struct at91_pmc *pmc, u8 type)
+of_at91_clk_periph_setup(struct device_node *np, u8 type)
 {
        int num;
        u32 id;
@@ -364,6 +375,7 @@ of_at91_clk_periph_setup(struct device_node *np, struct at91_pmc *pmc, u8 type)
        const char *parent_name;
        const char *name;
        struct device_node *periphclknp;
+       struct regmap *regmap;
 
        parent_name = of_clk_get_parent_name(np, 0);
        if (!parent_name)
@@ -373,6 +385,10 @@ of_at91_clk_periph_setup(struct device_node *np, struct at91_pmc *pmc, u8 type)
        if (!num || num > PERIPHERAL_MAX)
                return;
 
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
+
        for_each_child_of_node(np, periphclknp) {
                if (of_property_read_u32(periphclknp, "reg", &id))
                        continue;
@@ -384,7 +400,7 @@ of_at91_clk_periph_setup(struct device_node *np, struct at91_pmc *pmc, u8 type)
                        name = periphclknp->name;
 
                if (type == PERIPHERAL_AT91RM9200) {
-                       clk = at91_clk_register_peripheral(pmc, name,
+                       clk = at91_clk_register_peripheral(regmap, name,
                                                           parent_name, id);
                } else {
                        struct clk_range range = CLK_RANGE(0, 0);
@@ -393,7 +409,9 @@ of_at91_clk_periph_setup(struct device_node *np, struct at91_pmc *pmc, u8 type)
                                              "atmel,clk-output-range",
                                              &range);
 
-                       clk = at91_clk_register_sam9x5_peripheral(pmc, name,
+                       clk = at91_clk_register_sam9x5_peripheral(regmap,
+                                                                 &pmc_pcr_lock,
+                                                                 name,
                                                                  parent_name,
                                                                  id, &range);
                }
@@ -405,14 +423,16 @@ of_at91_clk_periph_setup(struct device_node *np, struct at91_pmc *pmc, u8 type)
        }
 }
 
-void __init of_at91rm9200_clk_periph_setup(struct device_node *np,
-                                          struct at91_pmc *pmc)
+static void __init of_at91rm9200_clk_periph_setup(struct device_node *np)
 {
-       of_at91_clk_periph_setup(np, pmc, PERIPHERAL_AT91RM9200);
+       of_at91_clk_periph_setup(np, PERIPHERAL_AT91RM9200);
 }
+CLK_OF_DECLARE(at91rm9200_clk_periph, "atmel,at91rm9200-clk-peripheral",
+              of_at91rm9200_clk_periph_setup);
 
-void __init of_at91sam9x5_clk_periph_setup(struct device_node *np,
-                                          struct at91_pmc *pmc)
+static void __init of_at91sam9x5_clk_periph_setup(struct device_node *np)
 {
-       of_at91_clk_periph_setup(np, pmc, PERIPHERAL_AT91SAM9X5);
+       of_at91_clk_periph_setup(np, PERIPHERAL_AT91SAM9X5);
 }
+CLK_OF_DECLARE(at91sam9x5_clk_periph, "atmel,at91sam9x5-clk-peripheral",
+              of_at91sam9x5_clk_periph_setup);
diff --git a/drivers/clk/at91/clk-pll.c b/drivers/clk/at91/clk-pll.c
index 18b60f4895a6..fb2e0b56d4b7 100644
--- a/drivers/clk/at91/clk-pll.c
+++ b/drivers/clk/at91/clk-pll.c
@@ -12,14 +12,8 @@
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/wait.h>
-#include <linux/sched.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include "pmc.h"
 
@@ -58,9 +52,7 @@ struct clk_pll_layout {
 
 struct clk_pll {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
-       unsigned int irq;
-       wait_queue_head_t wait;
+       struct regmap *regmap;
        u8 id;
        u8 div;
        u8 range;
@@ -69,20 +61,19 @@ struct clk_pll {
        const struct clk_pll_characteristics *characteristics;
 };
 
-static irqreturn_t clk_pll_irq_handler(int irq, void *dev_id)
+static inline bool clk_pll_ready(struct regmap *regmap, int id)
 {
-       struct clk_pll *pll = (struct clk_pll *)dev_id;
+       unsigned int status;
 
-       wake_up(&pll->wait);
-       disable_irq_nosync(pll->irq);
+       regmap_read(regmap, AT91_PMC_SR, &status);
 
-       return IRQ_HANDLED;
+       return status & PLL_STATUS_MASK(id) ? 1 : 0;
 }
 
 static int clk_pll_prepare(struct clk_hw *hw)
 {
        struct clk_pll *pll = to_clk_pll(hw);
-       struct at91_pmc *pmc = pll->pmc;
+       struct regmap *regmap = pll->regmap;
        const struct clk_pll_layout *layout = pll->layout;
        const struct clk_pll_characteristics *characteristics =
                                                        pll->characteristics;
@@ -90,39 +81,34 @@ static int clk_pll_prepare(struct clk_hw *hw)
        u32 mask = PLL_STATUS_MASK(id);
        int offset = PLL_REG(id);
        u8 out = 0;
-       u32 pllr, icpr;
+       unsigned int pllr;
+       unsigned int status;
        u8 div;
        u16 mul;
 
-       pllr = pmc_read(pmc, offset);
+       regmap_read(regmap, offset, &pllr);
        div = PLL_DIV(pllr);
        mul = PLL_MUL(pllr, layout);
 
-       if ((pmc_read(pmc, AT91_PMC_SR) & mask) &&
+       regmap_read(regmap, AT91_PMC_SR, &status);
+       if ((status & mask) &&
            (div == pll->div && mul == pll->mul))
                return 0;
 
        if (characteristics->out)
                out = characteristics->out[pll->range];
-       if (characteristics->icpll) {
-               icpr = pmc_read(pmc, AT91_PMC_PLLICPR) & ~PLL_ICPR_MASK(id);
-               icpr |= (characteristics->icpll[pll->range] <<
-                       PLL_ICPR_SHIFT(id));
-               pmc_write(pmc, AT91_PMC_PLLICPR, icpr);
-       }
 
-       pllr &= ~layout->pllr_mask;
-       pllr |= layout->pllr_mask &
-              (pll->div | (PLL_MAX_COUNT << PLL_COUNT_SHIFT) |
-               (out << PLL_OUT_SHIFT) |
-               ((pll->mul & layout->mul_mask) << layout->mul_shift));
-       pmc_write(pmc, offset, pllr);
-
-       while (!(pmc_read(pmc, AT91_PMC_SR) & mask)) {
-               enable_irq(pll->irq);
-               wait_event(pll->wait,
-                          pmc_read(pmc, AT91_PMC_SR) & mask);
-       }
+       if (characteristics->icpll)
+               regmap_update_bits(regmap, AT91_PMC_PLLICPR, PLL_ICPR_MASK(id),
+                       characteristics->icpll[pll->range] << PLL_ICPR_SHIFT(id));
+
+       regmap_update_bits(regmap, offset, layout->pllr_mask,
+                       pll->div | (PLL_MAX_COUNT << PLL_COUNT_SHIFT) |
+                       (out << PLL_OUT_SHIFT) |
+                       ((pll->mul & layout->mul_mask) << layout->mul_shift));
+
+       while (!clk_pll_ready(regmap, pll->id))
+               cpu_relax();
 
        return 0;
 }
@@ -130,32 +116,35 @@ static int clk_pll_prepare(struct clk_hw *hw)
 static int clk_pll_is_prepared(struct clk_hw *hw)
 {
        struct clk_pll *pll = to_clk_pll(hw);
-       struct at91_pmc *pmc = pll->pmc;
 
-       return !!(pmc_read(pmc, AT91_PMC_SR) &
-                 PLL_STATUS_MASK(pll->id));
+       return clk_pll_ready(pll->regmap, pll->id);
 }
 
 static void clk_pll_unprepare(struct clk_hw *hw)
 {
        struct clk_pll *pll = to_clk_pll(hw);
-       struct at91_pmc *pmc = pll->pmc;
-       const struct clk_pll_layout *layout = pll->layout;
-       int offset = PLL_REG(pll->id);
-       u32 tmp = pmc_read(pmc, offset) & ~(layout->pllr_mask);
+       unsigned int mask = pll->layout->pllr_mask;
 
-       pmc_write(pmc, offset, tmp);
+       regmap_update_bits(pll->regmap, PLL_REG(pll->id), mask, ~mask);
 }
 
 static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
                                         unsigned long parent_rate)
 {
        struct clk_pll *pll = to_clk_pll(hw);
+       unsigned int pllr;
+       u16 mul;
+       u8 div;
 
-       if (!pll->div || !pll->mul)
+       regmap_read(pll->regmap, PLL_REG(pll->id), &pllr);
+
+       div = PLL_DIV(pllr);
+       mul = PLL_MUL(pllr, pll->layout);
+
+       if (!div || !mul)
                return 0;
 
-       return (parent_rate / pll->div) * (pll->mul + 1);
+       return (parent_rate / div) * (mul + 1);
 }
 
 static long clk_pll_get_best_div_mul(struct clk_pll *pll, unsigned long rate,
@@ -308,7 +297,7 @@ static const struct clk_ops pll_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_pll(struct at91_pmc *pmc, unsigned int irq, const char *name,
+at91_clk_register_pll(struct regmap *regmap, const char *name,
                      const char *parent_name, u8 id,
                      const struct clk_pll_layout *layout,
                      const struct clk_pll_characteristics *characteristics)
@@ -316,9 +305,8 @@ at91_clk_register_pll(struct at91_pmc *pmc, unsigned int irq, const char *name,
        struct clk_pll *pll;
        struct clk *clk = NULL;
        struct clk_init_data init;
-       int ret;
        int offset = PLL_REG(id);
-       u32 tmp;
+       unsigned int pllr;
 
        if (id > PLL_MAX_ID)
                return ERR_PTR(-EINVAL);
@@ -337,23 +325,13 @@ at91_clk_register_pll(struct at91_pmc *pmc, unsigned int irq, const char *name,
        pll->hw.init = &init;
        pll->layout = layout;
        pll->characteristics = characteristics;
-       pll->pmc = pmc;
-       pll->irq = irq;
-       tmp = pmc_read(pmc, offset) & layout->pllr_mask;
-       pll->div = PLL_DIV(tmp);
-       pll->mul = PLL_MUL(tmp, layout);
-       init_waitqueue_head(&pll->wait);
-       irq_set_status_flags(pll->irq, IRQ_NOAUTOEN);
-       ret = request_irq(pll->irq, clk_pll_irq_handler, IRQF_TRIGGER_HIGH,
-                         id ? "clk-pllb" : "clk-plla", pll);
-       if (ret) {
-               kfree(pll);
-               return ERR_PTR(ret);
-       }
+       pll->regmap = regmap;
+       regmap_read(regmap, offset, &pllr);
+       pll->div = PLL_DIV(pllr);
+       pll->mul = PLL_MUL(pllr, layout);
 
        clk = clk_register(NULL, &pll->hw);
        if (IS_ERR(clk)) {
-               free_irq(pll->irq, pll);
                kfree(pll);
        }
 
@@ -483,12 +461,12 @@ of_at91_clk_pll_get_characteristics(struct device_node *np)
 }
 
 static void __init
-of_at91_clk_pll_setup(struct device_node *np, struct at91_pmc *pmc,
+of_at91_clk_pll_setup(struct device_node *np,
                      const struct clk_pll_layout *layout)
 {
        u32 id;
-       unsigned int irq;
        struct clk *clk;
+       struct regmap *regmap;
        const char *parent_name;
        const char *name = np->name;
        struct clk_pll_characteristics *characteristics;
@@ -500,15 +478,15 @@ of_at91_clk_pll_setup(struct device_node *np, struct at91_pmc *pmc,
 
        of_property_read_string(np, "clock-output-names", &name);
 
-       characteristics = of_at91_clk_pll_get_characteristics(np);
-       if (!characteristics)
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
                return;
 
-       irq = irq_of_parse_and_map(np, 0);
-       if (!irq)
+       characteristics = of_at91_clk_pll_get_characteristics(np);
+       if (!characteristics)
                return;
 
-       clk = at91_clk_register_pll(pmc, irq, name, parent_name, id, layout,
+       clk = at91_clk_register_pll(regmap, name, parent_name, id, layout,
                                    characteristics);
        if (IS_ERR(clk))
                goto out_free_characteristics;
@@ -520,26 +498,30 @@ of_at91_clk_pll_setup(struct device_node *np, struct at91_pmc *pmc,
        kfree(characteristics);
 }
 
-void __init of_at91rm9200_clk_pll_setup(struct device_node *np,
-                                              struct at91_pmc *pmc)
+static void __init of_at91rm9200_clk_pll_setup(struct device_node *np)
 {
-       of_at91_clk_pll_setup(np, pmc, &at91rm9200_pll_layout);
+       of_at91_clk_pll_setup(np, &at91rm9200_pll_layout);
 }
+CLK_OF_DECLARE(at91rm9200_clk_pll, "atmel,at91rm9200-clk-pll",
+              of_at91rm9200_clk_pll_setup);
 
-void __init of_at91sam9g45_clk_pll_setup(struct device_node *np,
-                                               struct at91_pmc *pmc)
+static void __init of_at91sam9g45_clk_pll_setup(struct device_node *np)
 {
-       of_at91_clk_pll_setup(np, pmc, &at91sam9g45_pll_layout);
+       of_at91_clk_pll_setup(np, &at91sam9g45_pll_layout);
 }
+CLK_OF_DECLARE(at91sam9g45_clk_pll, "atmel,at91sam9g45-clk-pll",
+              of_at91sam9g45_clk_pll_setup);
 
-void __init of_at91sam9g20_clk_pllb_setup(struct device_node *np,
-                                                struct at91_pmc *pmc)
+static void __init of_at91sam9g20_clk_pllb_setup(struct device_node *np)
 {
-       of_at91_clk_pll_setup(np, pmc, &at91sam9g20_pllb_layout);
+       of_at91_clk_pll_setup(np, &at91sam9g20_pllb_layout);
 }
+CLK_OF_DECLARE(at91sam9g20_clk_pllb, "atmel,at91sam9g20-clk-pllb",
+              of_at91sam9g20_clk_pllb_setup);
 
-void __init of_sama5d3_clk_pll_setup(struct device_node *np,
-                                           struct at91_pmc *pmc)
+static void __init of_sama5d3_clk_pll_setup(struct device_node *np)
 {
-       of_at91_clk_pll_setup(np, pmc, &sama5d3_pll_layout);
+       of_at91_clk_pll_setup(np, &sama5d3_pll_layout);
 }
+CLK_OF_DECLARE(sama5d3_clk_pll, "atmel,sama5d3-clk-pll",
+              of_sama5d3_clk_pll_setup);
diff --git a/drivers/clk/at91/clk-plldiv.c b/drivers/clk/at91/clk-plldiv.c
index ea226562bb40..2bed26481027 100644
--- a/drivers/clk/at91/clk-plldiv.c
+++ b/drivers/clk/at91/clk-plldiv.c
@@ -12,8 +12,8 @@
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include "pmc.h"
 
@@ -21,16 +21,18 @@
 
 struct clk_plldiv {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
+       struct regmap *regmap;
 };
 
 static unsigned long clk_plldiv_recalc_rate(struct clk_hw *hw,
                                            unsigned long parent_rate)
 {
        struct clk_plldiv *plldiv = to_clk_plldiv(hw);
-       struct at91_pmc *pmc = plldiv->pmc;
+       unsigned int mckr;
 
-       if (pmc_read(pmc, AT91_PMC_MCKR) & AT91_PMC_PLLADIV2)
+       regmap_read(plldiv->regmap, AT91_PMC_MCKR, &mckr);
+
+       if (mckr & AT91_PMC_PLLADIV2)
                return parent_rate / 2;
 
        return parent_rate;
@@ -57,18 +59,12 @@ static int clk_plldiv_set_rate(struct clk_hw *hw, unsigned long rate,
                               unsigned long parent_rate)
 {
        struct clk_plldiv *plldiv = to_clk_plldiv(hw);
-       struct at91_pmc *pmc = plldiv->pmc;
-       u32 tmp;
 
-       if (parent_rate != rate && (parent_rate / 2) != rate)
+       if ((parent_rate != rate) && (parent_rate / 2 != rate))
                return -EINVAL;
 
-       pmc_lock(pmc);
-       tmp = pmc_read(pmc, AT91_PMC_MCKR) & ~AT91_PMC_PLLADIV2;
-       if ((parent_rate / 2) == rate)
-               tmp |= AT91_PMC_PLLADIV2;
-       pmc_write(pmc, AT91_PMC_MCKR, tmp);
-       pmc_unlock(pmc);
+       regmap_update_bits(plldiv->regmap, AT91_PMC_MCKR, AT91_PMC_PLLADIV2,
+                          parent_rate != rate ? AT91_PMC_PLLADIV2 : 0);
 
        return 0;
 }
@@ -80,7 +76,7 @@ static const struct clk_ops plldiv_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_plldiv(struct at91_pmc *pmc, const char *name,
+at91_clk_register_plldiv(struct regmap *regmap, const char *name,
                         const char *parent_name)
 {
        struct clk_plldiv *plldiv;
@@ -98,7 +94,7 @@ at91_clk_register_plldiv(struct at91_pmc *pmc, const char *name,
        init.flags = CLK_SET_RATE_GATE;
 
        plldiv->hw.init = &init;
-       plldiv->pmc = pmc;
+       plldiv->regmap = regmap;
 
        clk = clk_register(NULL, &plldiv->hw);
 
@@ -109,27 +105,27 @@ at91_clk_register_plldiv(struct at91_pmc *pmc, const char *name,
 }
 
 static void __init
-of_at91_clk_plldiv_setup(struct device_node *np, struct at91_pmc *pmc)
+of_at91sam9x5_clk_plldiv_setup(struct device_node *np)
 {
        struct clk *clk;
        const char *parent_name;
        const char *name = np->name;
+       struct regmap *regmap;
 
        parent_name = of_clk_get_parent_name(np, 0);
 
        of_property_read_string(np, "clock-output-names", &name);
 
-       clk = at91_clk_register_plldiv(pmc, name, parent_name);
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
 
+       clk = at91_clk_register_plldiv(regmap, name, parent_name);
        if (IS_ERR(clk))
                return;
 
        of_clk_add_provider(np, of_clk_src_simple_get, clk);
        return;
 }
-
-void __init of_at91sam9x5_clk_plldiv_setup(struct device_node *np,
-                                          struct at91_pmc *pmc)
-{
-       of_at91_clk_plldiv_setup(np, pmc);
-}
+CLK_OF_DECLARE(at91sam9x5_clk_plldiv, "atmel,at91sam9x5-clk-plldiv",
+              of_at91sam9x5_clk_plldiv_setup);
diff --git a/drivers/clk/at91/clk-programmable.c b/drivers/clk/at91/clk-programmable.c
index 14b270b85fec..bc0be629671b 100644
--- a/drivers/clk/at91/clk-programmable.c
+++ b/drivers/clk/at91/clk-programmable.c
@@ -12,10 +12,8 @@
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/io.h>
-#include <linux/wait.h>
-#include <linux/sched.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include "pmc.h"
 
@@ -24,6 +22,7 @@
 
 #define PROG_STATUS_MASK(id)   (1 << ((id) + 8))
 #define PROG_PRES_MASK         0x7
+#define PROG_PRES(layout, pckr)        ((pckr >> layout->pres_shift) & PROG_PRES_MASK)
 #define PROG_MAX_RM9200_CSS    3
 
 struct clk_programmable_layout {
@@ -34,7 +33,7 @@ struct clk_programmable_layout {
 
 struct clk_programmable {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
+       struct regmap *regmap;
        u8 id;
        const struct clk_programmable_layout *layout;
 };
@@ -44,14 +43,12 @@ struct clk_programmable {
 static unsigned long clk_programmable_recalc_rate(struct clk_hw *hw,
                                                  unsigned long parent_rate)
 {
-       u32 pres;
        struct clk_programmable *prog = to_clk_programmable(hw);
-       struct at91_pmc *pmc = prog->pmc;
-       const struct clk_programmable_layout *layout = prog->layout;
+       unsigned int pckr;
+
+       regmap_read(prog->regmap, AT91_PMC_PCKR(prog->id), &pckr);
 
-       pres = (pmc_read(pmc, AT91_PMC_PCKR(prog->id)) >> layout->pres_shift) &
-              PROG_PRES_MASK;
-       return parent_rate >> pres;
+       return parent_rate >> PROG_PRES(prog->layout, pckr);
 }
 
 static int clk_programmable_determine_rate(struct clk_hw *hw,
@@ -101,36 +98,36 @@ static int clk_programmable_set_parent(struct clk_hw *hw, u8 index)
 {
        struct clk_programmable *prog = to_clk_programmable(hw);
        const struct clk_programmable_layout *layout = prog->layout;
-       struct at91_pmc *pmc = prog->pmc;
-       u32 tmp = pmc_read(pmc, AT91_PMC_PCKR(prog->id)) & ~layout->css_mask;
+       unsigned int mask = layout->css_mask;
+       unsigned int pckr = 0;
 
        if (layout->have_slck_mck)
-               tmp &= AT91_PMC_CSSMCK_MCK;
+               mask |= AT91_PMC_CSSMCK_MCK;
 
        if (index > layout->css_mask) {
-               if (index > PROG_MAX_RM9200_CSS && layout->have_slck_mck) {
-                       tmp |= AT91_PMC_CSSMCK_MCK;
-                       return 0;
-               } else {
+               if (index > PROG_MAX_RM9200_CSS && !layout->have_slck_mck)
                        return -EINVAL;
-               }
+
+               pckr |= AT91_PMC_CSSMCK_MCK;
        }
 
-       pmc_write(pmc, AT91_PMC_PCKR(prog->id), tmp | index);
+       regmap_update_bits(prog->regmap, AT91_PMC_PCKR(prog->id), mask, pckr);
+
        return 0;
 }
 
 static u8 clk_programmable_get_parent(struct clk_hw *hw)
 {
-       u32 tmp;
-       u8 ret;
        struct clk_programmable *prog = to_clk_programmable(hw);
-       struct at91_pmc *pmc = prog->pmc;
        const struct clk_programmable_layout *layout = prog->layout;
+       unsigned int pckr;
+       u8 ret;
+
+       regmap_read(prog->regmap, AT91_PMC_PCKR(prog->id), &pckr);
+
+       ret = pckr & layout->css_mask;
 
-       tmp = pmc_read(pmc, AT91_PMC_PCKR(prog->id));
-       ret = tmp & layout->css_mask;
-       if (layout->have_slck_mck && (tmp & AT91_PMC_CSSMCK_MCK) && !ret)
+       if (layout->have_slck_mck && (pckr & AT91_PMC_CSSMCK_MCK) && !ret)
                ret = PROG_MAX_RM9200_CSS + 1;
 
        return ret;
@@ -140,26 +137,27 @@ static int clk_programmable_set_rate(struct clk_hw *hw, unsigned long rate,
                                     unsigned long parent_rate)
 {
        struct clk_programmable *prog = to_clk_programmable(hw);
-       struct at91_pmc *pmc = prog->pmc;
        const struct clk_programmable_layout *layout = prog->layout;
        unsigned long div = parent_rate / rate;
+       unsigned int pckr;
        int shift = 0;
-       u32 tmp = pmc_read(pmc, AT91_PMC_PCKR(prog->id)) &
-                 ~(PROG_PRES_MASK << layout->pres_shift);
+
+       regmap_read(prog->regmap, AT91_PMC_PCKR(prog->id), &pckr);
 
        if (!div)
                return -EINVAL;
 
        shift = fls(div) - 1;
 
-       if (div != (1<<shift))
+       if (div != (1 << shift))
                return -EINVAL;
 
        if (shift >= PROG_PRES_MASK)
                return -EINVAL;
 
-       pmc_write(pmc, AT91_PMC_PCKR(prog->id),
-                 tmp | (shift << layout->pres_shift));
+       regmap_update_bits(prog->regmap, AT91_PMC_PCKR(prog->id),
+                          PROG_PRES_MASK << layout->pres_shift,
+                          shift << layout->pres_shift);
 
        return 0;
 }
@@ -173,7 +171,7 @@ static const struct clk_ops programmable_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_programmable(struct at91_pmc *pmc,
+at91_clk_register_programmable(struct regmap *regmap,
                               const char *name, const char **parent_names,
                               u8 num_parents, u8 id,
                               const struct clk_programmable_layout *layout)
@@ -198,7 +196,7 @@ at91_clk_register_programmable(struct at91_pmc *pmc,
        prog->id = id;
        prog->layout = layout;
        prog->hw.init = &init;
-       prog->pmc = pmc;
+       prog->regmap = regmap;
 
        clk = clk_register(NULL, &prog->hw);
        if (IS_ERR(clk))
@@ -226,7 +224,7 @@ static const struct clk_programmable_layout at91sam9x5_programmable_layout = {
 };
 
 static void __init
-of_at91_clk_prog_setup(struct device_node *np, struct at91_pmc *pmc,
+of_at91_clk_prog_setup(struct device_node *np,
                       const struct clk_programmable_layout *layout)
 {
        int num;
@@ -236,6 +234,7 @@ of_at91_clk_prog_setup(struct device_node *np, struct at91_pmc *pmc,
        const char *parent_names[PROG_SOURCE_MAX];
        const char *name;
        struct device_node *progclknp;
+       struct regmap *regmap;
 
        num_parents = of_clk_get_parent_count(np);
        if (num_parents <= 0 || num_parents > PROG_SOURCE_MAX)
@@ -247,6 +246,10 @@ of_at91_clk_prog_setup(struct device_node *np, struct at91_pmc *pmc,
        if (!num || num > (PROG_ID_MAX + 1))
                return;
 
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
+
        for_each_child_of_node(np, progclknp) {
                if (of_property_read_u32(progclknp, "reg", &id))
                        continue;
@@ -254,7 +257,7 @@ of_at91_clk_prog_setup(struct device_node *np, struct at91_pmc *pmc,
                if (of_property_read_string(np, "clock-output-names", &name))
                        name = progclknp->name;
 
-               clk = at91_clk_register_programmable(pmc, name,
+               clk = at91_clk_register_programmable(regmap, name,
                                                     parent_names, num_parents,
                                                     id, layout);
                if (IS_ERR(clk))
@@ -265,20 +268,23 @@ of_at91_clk_prog_setup(struct device_node *np, struct at91_pmc *pmc,
 }
 
 
-void __init of_at91rm9200_clk_prog_setup(struct device_node *np,
-                                        struct at91_pmc *pmc)
+static void __init of_at91rm9200_clk_prog_setup(struct device_node *np)
 {
-       of_at91_clk_prog_setup(np, pmc, &at91rm9200_programmable_layout);
+       of_at91_clk_prog_setup(np, &at91rm9200_programmable_layout);
 }
+CLK_OF_DECLARE(at91rm9200_clk_prog, "atmel,at91rm9200-clk-programmable",
+              of_at91rm9200_clk_prog_setup);
 
-void __init of_at91sam9g45_clk_prog_setup(struct device_node *np,
-                                         struct at91_pmc *pmc)
+static void __init of_at91sam9g45_clk_prog_setup(struct device_node *np)
 {
-       of_at91_clk_prog_setup(np, pmc, &at91sam9g45_programmable_layout);
+       of_at91_clk_prog_setup(np, &at91sam9g45_programmable_layout);
 }
+CLK_OF_DECLARE(at91sam9g45_clk_prog, "atmel,at91sam9g45-clk-programmable",
+              of_at91sam9g45_clk_prog_setup);
 
-void __init of_at91sam9x5_clk_prog_setup(struct device_node *np,
-                                        struct at91_pmc *pmc)
+static void __init of_at91sam9x5_clk_prog_setup(struct device_node *np)
 {
-       of_at91_clk_prog_setup(np, pmc, &at91sam9x5_programmable_layout);
+       of_at91_clk_prog_setup(np, &at91sam9x5_programmable_layout);
 }
+CLK_OF_DECLARE(at91sam9x5_clk_prog, "atmel,at91sam9x5-clk-programmable",
+              of_at91sam9x5_clk_prog_setup);
diff --git a/drivers/clk/at91/clk-slow.c b/drivers/clk/at91/clk-slow.c
index d0d5076a9b94..221c09684ba3 100644
--- a/drivers/clk/at91/clk-slow.c
+++ b/drivers/clk/at91/clk-slow.c
@@ -13,17 +13,11 @@
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/clkdev.h>
-#include <linux/slab.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/delay.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/io.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/sched.h>
-#include <linux/wait.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include "pmc.h"
 #include "sckc.h"
@@ -59,7 +53,7 @@ struct clk_slow_rc_osc {
 
 struct clk_sam9260_slow {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
+       struct regmap *regmap;
 };
 
 #define to_clk_sam9260_slow(hw) container_of(hw, struct clk_sam9260_slow, hw)
@@ -393,8 +387,11 @@ void __init of_at91sam9x5_clk_slow_setup(struct device_node *np,
 static u8 clk_sam9260_slow_get_parent(struct clk_hw *hw)
 {
        struct clk_sam9260_slow *slowck = to_clk_sam9260_slow(hw);
+       unsigned int status;
 
-       return !!(pmc_read(slowck->pmc, AT91_PMC_SR) & AT91_PMC_OSCSEL);
+       regmap_read(slowck->regmap, AT91_PMC_SR, &status);
+
+       return status & AT91_PMC_OSCSEL ? 1 : 0;
 }
 
 static const struct clk_ops sam9260_slow_ops = {
@@ -402,7 +399,7 @@ static const struct clk_ops sam9260_slow_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_sam9260_slow(struct at91_pmc *pmc,
+at91_clk_register_sam9260_slow(struct regmap *regmap,
                               const char *name,
                               const char **parent_names,
                               int num_parents)
@@ -411,7 +408,7 @@ at91_clk_register_sam9260_slow(struct at91_pmc *pmc,
        struct clk *clk = NULL;
        struct clk_init_data init;
 
-       if (!pmc || !name)
+       if (!name)
                return ERR_PTR(-EINVAL);
 
        if (!parent_names || !num_parents)
@@ -428,7 +425,7 @@ at91_clk_register_sam9260_slow(struct at91_pmc *pmc,
        init.flags = 0;
 
        slowck->hw.init = &init;
-       slowck->pmc = pmc;
+       slowck->regmap = regmap;
 
        clk = clk_register(NULL, &slowck->hw);
        if (IS_ERR(clk))
@@ -439,29 +436,34 @@ at91_clk_register_sam9260_slow(struct at91_pmc *pmc,
        return clk;
 }
 
-void __init of_at91sam9260_clk_slow_setup(struct device_node *np,
-                                         struct at91_pmc *pmc)
+static void __init of_at91sam9260_clk_slow_setup(struct device_node *np)
 {
        struct clk *clk;
        const char *parent_names[2];
        int num_parents;
        const char *name = np->name;
+       struct regmap *regmap;
 
        num_parents = of_clk_get_parent_count(np);
        if (num_parents != 2)
                return;
 
        of_clk_parent_fill(np, parent_names, num_parents);
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
 
        of_property_read_string(np, "clock-output-names", &name);
 
-       clk = at91_clk_register_sam9260_slow(pmc, name, parent_names,
+       clk = at91_clk_register_sam9260_slow(regmap, name, parent_names,
                                             num_parents);
        if (IS_ERR(clk))
                return;
 
        of_clk_add_provider(np, of_clk_src_simple_get, clk);
 }
+CLK_OF_DECLARE(at91sam9260_clk_slow, "atmel,at91sam9260-clk-slow",
+              of_at91sam9260_clk_slow_setup);
 
 /*
  * FIXME: All slow clk users are not properly claiming it (get + prepare +
diff --git a/drivers/clk/at91/clk-smd.c b/drivers/clk/at91/clk-smd.c
index a7f8501cfa05..e6948a52005a 100644
--- a/drivers/clk/at91/clk-smd.c
+++ b/drivers/clk/at91/clk-smd.c
@@ -12,8 +12,8 @@
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include "pmc.h"
 
@@ -24,7 +24,7 @@
 
 struct at91sam9x5_clk_smd {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
+       struct regmap *regmap;
 };
 
 #define to_at91sam9x5_clk_smd(hw) \
@@ -33,13 +33,13 @@ struct at91sam9x5_clk_smd {
 static unsigned long at91sam9x5_clk_smd_recalc_rate(struct clk_hw *hw,
                                                    unsigned long parent_rate)
 {
-       u32 tmp;
-       u8 smddiv;
        struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw);
-       struct at91_pmc *pmc = smd->pmc;
+       unsigned int smdr;
+       u8 smddiv;
+
+       regmap_read(smd->regmap, AT91_PMC_SMD, &smdr);
+       smddiv = (smdr & AT91_PMC_SMD_DIV) >> SMD_DIV_SHIFT;
 
-       tmp = pmc_read(pmc, AT91_PMC_SMD);
-       smddiv = (tmp & AT91_PMC_SMD_DIV) >> SMD_DIV_SHIFT;
        return parent_rate / (smddiv + 1);
 }
 
@@ -67,40 +67,38 @@ static long at91sam9x5_clk_smd_round_rate(struct clk_hw *hw, unsigned long rate,
 
 static int at91sam9x5_clk_smd_set_parent(struct clk_hw *hw, u8 index)
 {
-       u32 tmp;
        struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw);
-       struct at91_pmc *pmc = smd->pmc;
 
        if (index > 1)
                return -EINVAL;
-       tmp = pmc_read(pmc, AT91_PMC_SMD) & ~AT91_PMC_SMDS;
-       if (index)
-               tmp |= AT91_PMC_SMDS;
-       pmc_write(pmc, AT91_PMC_SMD, tmp);
+
+       regmap_update_bits(smd->regmap, AT91_PMC_SMD, AT91_PMC_SMDS,
+                          index ? AT91_PMC_SMDS : 0);
+
        return 0;
 }
 
 static u8 at91sam9x5_clk_smd_get_parent(struct clk_hw *hw)
 {
        struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw);
-       struct at91_pmc *pmc = smd->pmc;
+       unsigned int smdr;
 
-       return pmc_read(pmc, AT91_PMC_SMD) & AT91_PMC_SMDS;
+       regmap_read(smd->regmap, AT91_PMC_SMD, &smdr);
+
+       return smdr & AT91_PMC_SMDS;
 }
 
 static int at91sam9x5_clk_smd_set_rate(struct clk_hw *hw, unsigned long rate,
                                       unsigned long parent_rate)
 {
-       u32 tmp;
        struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw);
-       struct at91_pmc *pmc = smd->pmc;
        unsigned long div = parent_rate / rate;
 
        if (parent_rate % rate || div < 1 || div > (SMD_MAX_DIV + 1))
                return -EINVAL;
-       tmp = pmc_read(pmc, AT91_PMC_SMD) & ~AT91_PMC_SMD_DIV;
-       tmp |= (div - 1) << SMD_DIV_SHIFT;
-       pmc_write(pmc, AT91_PMC_SMD, tmp);
+
+       regmap_update_bits(smd->regmap, AT91_PMC_SMD, AT91_PMC_SMD_DIV,
+                          (div - 1) << SMD_DIV_SHIFT);
 
        return 0;
 }
@@ -114,7 +112,7 @@ static const struct clk_ops at91sam9x5_smd_ops = {
 };
 
 static struct clk * __init
-at91sam9x5_clk_register_smd(struct at91_pmc *pmc, const char *name,
+at91sam9x5_clk_register_smd(struct regmap *regmap, const char *name,
                            const char **parent_names, u8 num_parents)
 {
        struct at91sam9x5_clk_smd *smd;
@@ -132,7 +130,7 @@ at91sam9x5_clk_register_smd(struct at91_pmc *pmc, const char *name,
        init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
 
        smd->hw.init = &init;
-       smd->pmc = pmc;
+       smd->regmap = regmap;
 
        clk = clk_register(NULL, &smd->hw);
        if (IS_ERR(clk))
@@ -141,13 +139,13 @@ at91sam9x5_clk_register_smd(struct at91_pmc *pmc, const char *name,
        return clk;
 }
 
-void __init of_at91sam9x5_clk_smd_setup(struct device_node *np,
-                                       struct at91_pmc *pmc)
+static void __init of_at91sam9x5_clk_smd_setup(struct device_node *np)
 {
        struct clk *clk;
        int num_parents;
        const char *parent_names[SMD_SOURCE_MAX];
        const char *name = np->name;
+       struct regmap *regmap;
 
        num_parents = of_clk_get_parent_count(np);
        if (num_parents <= 0 || num_parents > SMD_SOURCE_MAX)
@@ -157,10 +155,16 @@ void __init of_at91sam9x5_clk_smd_setup(struct device_node *np,
 
        of_property_read_string(np, "clock-output-names", &name);
 
-       clk = at91sam9x5_clk_register_smd(pmc, name, parent_names,
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
+
+       clk = at91sam9x5_clk_register_smd(regmap, name, parent_names,
                                          num_parents);
        if (IS_ERR(clk))
                return;
 
        of_clk_add_provider(np, of_clk_src_simple_get, clk);
 }
+CLK_OF_DECLARE(at91sam9x5_clk_smd, "atmel,at91sam9x5-clk-smd",
+              of_at91sam9x5_clk_smd_setup);
diff --git a/drivers/clk/at91/clk-system.c b/drivers/clk/at91/clk-system.c
index 3f5314344286..8f35d8172909 100644
--- a/drivers/clk/at91/clk-system.c
+++ b/drivers/clk/at91/clk-system.c
@@ -12,13 +12,8 @@
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/io.h>
-#include <linux/irq.h>
-#include <linux/of_irq.h>
-#include <linux/interrupt.h>
-#include <linux/wait.h>
-#include <linux/sched.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include "pmc.h"
 
@@ -29,9 +24,7 @@
 #define to_clk_system(hw) container_of(hw, struct clk_system, hw)
 struct clk_system {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
-       unsigned int irq;
-       wait_queue_head_t wait;
+       struct regmap *regmap;
        u8 id;
 };
 
@@ -39,58 +32,54 @@ static inline int is_pck(int id)
 {
        return (id >= 8) && (id <= 15);
 }
-static irqreturn_t clk_system_irq_handler(int irq, void *dev_id)
+
+static inline bool clk_system_ready(struct regmap *regmap, int id)
 {
-       struct clk_system *sys = (struct clk_system *)dev_id;
+       unsigned int status;
 
-       wake_up(&sys->wait);
-       disable_irq_nosync(sys->irq);
+       regmap_read(regmap, AT91_PMC_SR, &status);
 
-       return IRQ_HANDLED;
+       return status & (1 << id) ? 1 : 0;
 }
 
 static int clk_system_prepare(struct clk_hw *hw)
 {
        struct clk_system *sys = to_clk_system(hw);
-       struct at91_pmc *pmc = sys->pmc;
-       u32 mask = 1 << sys->id;
 
-       pmc_write(pmc, AT91_PMC_SCER, mask);
+       regmap_write(sys->regmap, AT91_PMC_SCER, 1 << sys->id);
 
        if (!is_pck(sys->id))
                return 0;
 
-       while (!(pmc_read(pmc, AT91_PMC_SR) & mask)) {
-               if (sys->irq) {
-                       enable_irq(sys->irq);
-                       wait_event(sys->wait,
-                                  pmc_read(pmc, AT91_PMC_SR) & mask);
-               } else
-                       cpu_relax();
-       }
+       while (!clk_system_ready(sys->regmap, sys->id))
+               cpu_relax();
+
        return 0;
 }
 
 static void clk_system_unprepare(struct clk_hw *hw)
 {
        struct clk_system *sys = to_clk_system(hw);
-       struct at91_pmc *pmc = sys->pmc;
 
-       pmc_write(pmc, AT91_PMC_SCDR, 1 << sys->id);
+       regmap_write(sys->regmap, AT91_PMC_SCDR, 1 << sys->id);
 }
 
 static int clk_system_is_prepared(struct clk_hw *hw)
 {
        struct clk_system *sys = to_clk_system(hw);
-       struct at91_pmc *pmc = sys->pmc;
+       unsigned int status;
+
+       regmap_read(sys->regmap, AT91_PMC_SCSR, &status);
 
-       if (!(pmc_read(pmc, AT91_PMC_SCSR) & (1 << sys->id)))
+       if (!(status & (1 << sys->id)))
                return 0;
 
        if (!is_pck(sys->id))
                return 1;
 
-       return !!(pmc_read(pmc, AT91_PMC_SR) & (1 << sys->id));
+       regmap_read(sys->regmap, AT91_PMC_SR, &status);
+
+       return status & (1 << sys->id) ? 1 : 0;
 }
 
 static const struct clk_ops system_ops = {
@@ -100,13 +89,12 @@ static const struct clk_ops system_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_system(struct at91_pmc *pmc, const char *name,
-                        const char *parent_name, u8 id, int irq)
+at91_clk_register_system(struct regmap *regmap, const char *name,
+                        const char *parent_name, u8 id)
 {
        struct clk_system *sys;
        struct clk *clk = NULL;
        struct clk_init_data init;
-       int ret;
 
        if (!parent_name || id > SYSTEM_MAX_ID)
                return ERR_PTR(-EINVAL);
@@ -123,44 +111,33 @@ at91_clk_register_system(struct at91_pmc *pmc, const char *name,
 
        sys->id = id;
        sys->hw.init = &init;
-       sys->pmc = pmc;
-       sys->irq = irq;
-       if (irq) {
-               init_waitqueue_head(&sys->wait);
-               irq_set_status_flags(sys->irq, IRQ_NOAUTOEN);
-               ret = request_irq(sys->irq, clk_system_irq_handler,
-                               IRQF_TRIGGER_HIGH, name, sys);
-               if (ret) {
-                       kfree(sys);
-                       return ERR_PTR(ret);
-               }
-       }
+       sys->regmap = regmap;
 
        clk = clk_register(NULL, &sys->hw);
-       if (IS_ERR(clk)) {
-               if (irq)
-                       free_irq(sys->irq, sys);
+       if (IS_ERR(clk))
                kfree(sys);
-       }
 
        return clk;
 }
 
-static void __init
-of_at91_clk_sys_setup(struct device_node *np, struct at91_pmc *pmc)
+static void __init of_at91rm9200_clk_sys_setup(struct device_node *np)
 {
        int num;
-       int irq = 0;
        u32 id;
        struct clk *clk;
        const char *name;
        struct device_node *sysclknp;
        const char *parent_name;
+       struct regmap *regmap;
 
        num = of_get_child_count(np);
        if (num > (SYSTEM_MAX_ID + 1))
                return;
 
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
+
        for_each_child_of_node(np, sysclknp) {
                if (of_property_read_u32(sysclknp, "reg", &id))
                        continue;
@@ -168,21 +145,14 @@ of_at91_clk_sys_setup(struct device_node *np, struct at91_pmc *pmc)
                if (of_property_read_string(np, "clock-output-names", &name))
                        name = sysclknp->name;
 
-               if (is_pck(id))
-                       irq = irq_of_parse_and_map(sysclknp, 0);
-
                parent_name = of_clk_get_parent_name(sysclknp, 0);
 
-               clk = at91_clk_register_system(pmc, name, parent_name, id, irq);
+               clk = at91_clk_register_system(regmap, name, parent_name, id);
                if (IS_ERR(clk))
                        continue;
 
                of_clk_add_provider(sysclknp, of_clk_src_simple_get, clk);
        }
 }
-
-void __init of_at91rm9200_clk_sys_setup(struct device_node *np,
-                                       struct at91_pmc *pmc)
-{
-       of_at91_clk_sys_setup(np, pmc);
-}
+CLK_OF_DECLARE(at91rm9200_clk_sys, "atmel,at91rm9200-clk-system",
+              of_at91rm9200_clk_sys_setup);
diff --git a/drivers/clk/at91/clk-usb.c b/drivers/clk/at91/clk-usb.c
index 8ab8502778a2..650ca45892c0 100644
--- a/drivers/clk/at91/clk-usb.c
+++ b/drivers/clk/at91/clk-usb.c
@@ -12,8 +12,8 @@
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include "pmc.h"
 
@@ -27,7 +27,7 @@
 
 struct at91sam9x5_clk_usb {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
+       struct regmap *regmap;
 };
 
 #define to_at91sam9x5_clk_usb(hw) \
@@ -35,7 +35,7 @@ struct at91sam9x5_clk_usb {
 
 struct at91rm9200_clk_usb {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
+       struct regmap *regmap;
        u32 divisors[4];
 };
 
@@ -45,13 +45,12 @@ struct at91rm9200_clk_usb {
 static unsigned long at91sam9x5_clk_usb_recalc_rate(struct clk_hw *hw,
                                                    unsigned long parent_rate)
 {
-       u32 tmp;
-       u8 usbdiv;
        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
-       struct at91_pmc *pmc = usb->pmc;
+       unsigned int usbr;
+       u8 usbdiv;
 
-       tmp = pmc_read(pmc, AT91_PMC_USB);
-       usbdiv = (tmp & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;
+       regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
+       usbdiv = (usbr & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;
 
        return DIV_ROUND_CLOSEST(parent_rate, (usbdiv + 1));
 }
@@ -109,33 +108,31 @@ static int at91sam9x5_clk_usb_determine_rate(struct clk_hw *hw,
 
 static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
 {
-       u32 tmp;
        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
-       struct at91_pmc *pmc = usb->pmc;
 
        if (index > 1)
                return -EINVAL;
-       tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS;
-       if (index)
-               tmp |= AT91_PMC_USBS;
-       pmc_write(pmc, AT91_PMC_USB, tmp);
+
+       regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS,
+                          index ? AT91_PMC_USBS : 0);
+
        return 0;
 }
 
 static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
 {
        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
-       struct at91_pmc *pmc = usb->pmc;
+       unsigned int usbr;
 
-       return pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS;
+       regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
+
+       return usbr & AT91_PMC_USBS;
 }
 
 static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
                                       unsigned long parent_rate)
 {
-       u32 tmp;
        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
-       struct at91_pmc *pmc = usb->pmc;
        unsigned long div;
 
        if (!rate)
@@ -145,9 +142,8 @@ static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
        if (div > SAM9X5_USB_MAX_DIV + 1 || !div)
                return -EINVAL;
 
-       tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_OHCIUSBDIV;
-       tmp |= (div - 1) << SAM9X5_USB_DIV_SHIFT;
-       pmc_write(pmc, AT91_PMC_USB, tmp);
+       regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_OHCIUSBDIV,
+                          (div - 1) << SAM9X5_USB_DIV_SHIFT);
 
        return 0;
 }
@@ -163,28 +159,28 @@ static const struct clk_ops at91sam9x5_usb_ops = {
 static int at91sam9n12_clk_usb_enable(struct clk_hw *hw)
 {
        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
-       struct at91_pmc *pmc = usb->pmc;
 
-       pmc_write(pmc, AT91_PMC_USB,
-                 pmc_read(pmc, AT91_PMC_USB) | AT91_PMC_USBS);
+       regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS,
+                          AT91_PMC_USBS);
+
        return 0;
 }
 
 static void at91sam9n12_clk_usb_disable(struct clk_hw *hw)
 {
        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
-       struct at91_pmc *pmc = usb->pmc;
 
-       pmc_write(pmc, AT91_PMC_USB,
-                 pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS);
+       regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS, 0);
 }
 
 static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)
 {
        struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
-       struct at91_pmc *pmc = usb->pmc;
+       unsigned int usbr;
 
-       return !!(pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS);
+       regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
+
+       return usbr & AT91_PMC_USBS;
 }
 
 static const struct clk_ops at91sam9n12_usb_ops = {
@@ -197,7 +193,7 @@ static const struct clk_ops at91sam9n12_usb_ops = {
 };
 
 static struct clk * __init
-at91sam9x5_clk_register_usb(struct at91_pmc *pmc, const char *name,
+at91sam9x5_clk_register_usb(struct regmap *regmap, const char *name,
                            const char **parent_names, u8 num_parents)
 {
        struct at91sam9x5_clk_usb *usb;
@@ -216,7 +212,7 @@ at91sam9x5_clk_register_usb(struct at91_pmc *pmc, const char *name,
                     CLK_SET_RATE_PARENT;
 
        usb->hw.init = &init;
-       usb->pmc = pmc;
+       usb->regmap = regmap;
 
        clk = clk_register(NULL, &usb->hw);
        if (IS_ERR(clk))
@@ -226,7 +222,7 @@ at91sam9x5_clk_register_usb(struct at91_pmc *pmc, const char *name,
 }
 
 static struct clk * __init
-at91sam9n12_clk_register_usb(struct at91_pmc *pmc, const char *name,
+at91sam9n12_clk_register_usb(struct regmap *regmap, const char *name,
                             const char *parent_name)
 {
        struct at91sam9x5_clk_usb *usb;
@@ -244,7 +240,7 @@ at91sam9n12_clk_register_usb(struct at91_pmc *pmc, const char *name,
        init.flags = CLK_SET_RATE_GATE | CLK_SET_RATE_PARENT;
 
        usb->hw.init = &init;
-       usb->pmc = pmc;
+       usb->regmap = regmap;
 
        clk = clk_register(NULL, &usb->hw);
        if (IS_ERR(clk))
@@ -257,12 +253,12 @@ static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
                                                    unsigned long parent_rate)
 {
        struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
-       struct at91_pmc *pmc = usb->pmc;
-       u32 tmp;
+       unsigned int pllbr;
        u8 usbdiv;
 
-       tmp = pmc_read(pmc, AT91_CKGR_PLLBR);
-       usbdiv = (tmp & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;
+       regmap_read(usb->regmap, AT91_CKGR_PLLBR, &pllbr);
+
+       usbdiv = (pllbr & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;
        if (usb->divisors[usbdiv])
                return parent_rate / usb->divisors[usbdiv];
 
@@ -310,10 +306,8 @@ static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
 static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
                                       unsigned long parent_rate)
 {
-       u32 tmp;
        int i;
        struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
-       struct at91_pmc *pmc = usb->pmc;
        unsigned long div;
 
        if (!rate)
@@ -323,10 +317,10 @@ static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
 
        for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
                if (usb->divisors[i] == div) {
-                       tmp = pmc_read(pmc, AT91_CKGR_PLLBR) &
-                             ~AT91_PMC_USBDIV;
-                       tmp |= i << RM9200_USB_DIV_SHIFT;
-                       pmc_write(pmc, AT91_CKGR_PLLBR, tmp);
+                       regmap_update_bits(usb->regmap, AT91_CKGR_PLLBR,
+                                          AT91_PMC_USBDIV,
+                                          i << RM9200_USB_DIV_SHIFT);
+
                        return 0;
                }
        }
@@ -341,7 +335,7 @@ static const struct clk_ops at91rm9200_usb_ops = {
 };
 
 static struct clk * __init
-at91rm9200_clk_register_usb(struct at91_pmc *pmc, const char *name,
+at91rm9200_clk_register_usb(struct regmap *regmap, const char *name,
                            const char *parent_name, const u32 *divisors)
 {
        struct at91rm9200_clk_usb *usb;
@@ -359,7 +353,7 @@ at91rm9200_clk_register_usb(struct at91_pmc *pmc, const char *name,
        init.flags = CLK_SET_RATE_PARENT;
 
        usb->hw.init = &init;
-       usb->pmc = pmc;
+       usb->regmap = regmap;
        memcpy(usb->divisors, divisors, sizeof(usb->divisors));
 
        clk = clk_register(NULL, &usb->hw);
@@ -369,13 +363,13 @@ at91rm9200_clk_register_usb(struct at91_pmc *pmc, const char *name,
        return clk;
 }
 
-void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,
-                                       struct at91_pmc *pmc)
+static void __init of_at91sam9x5_clk_usb_setup(struct device_node *np)
 {
        struct clk *clk;
        int num_parents;
        const char *parent_names[USB_SOURCE_MAX];
        const char *name = np->name;
+       struct regmap *regmap;
 
        num_parents = of_clk_get_parent_count(np);
        if (num_parents <= 0 || num_parents > USB_SOURCE_MAX)
@@ -385,19 +379,26 @@ void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,
 
        of_property_read_string(np, "clock-output-names", &name);
 
-       clk = at91sam9x5_clk_register_usb(pmc, name, parent_names, num_parents);
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
+
+       clk = at91sam9x5_clk_register_usb(regmap, name, parent_names,
+                                         num_parents);
        if (IS_ERR(clk))
                return;
 
        of_clk_add_provider(np, of_clk_src_simple_get, clk);
 }
+CLK_OF_DECLARE(at91sam9x5_clk_usb, "atmel,at91sam9x5-clk-usb",
+              of_at91sam9x5_clk_usb_setup);
 
-void __init of_at91sam9n12_clk_usb_setup(struct device_node *np,
-                                        struct at91_pmc *pmc)
+static void __init of_at91sam9n12_clk_usb_setup(struct device_node *np)
 {
        struct clk *clk;
        const char *parent_name;
        const char *name = np->name;
+       struct regmap *regmap;
 
        parent_name = of_clk_get_parent_name(np, 0);
        if (!parent_name)
@@ -405,20 +406,26 @@ void __init of_at91sam9n12_clk_usb_setup(struct device_node *np,
 
        of_property_read_string(np, "clock-output-names", &name);
 
-       clk = at91sam9n12_clk_register_usb(pmc, name, parent_name);
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
+
+       clk = at91sam9n12_clk_register_usb(regmap, name, parent_name);
        if (IS_ERR(clk))
                return;
 
        of_clk_add_provider(np, of_clk_src_simple_get, clk);
 }
+CLK_OF_DECLARE(at91sam9n12_clk_usb, "atmel,at91sam9n12-clk-usb",
+              of_at91sam9n12_clk_usb_setup);
 
-void __init of_at91rm9200_clk_usb_setup(struct device_node *np,
-                                       struct at91_pmc *pmc)
+static void __init of_at91rm9200_clk_usb_setup(struct device_node *np)
 {
        struct clk *clk;
        const char *parent_name;
        const char *name = np->name;
        u32 divisors[4] = {0, 0, 0, 0};
+       struct regmap *regmap;
 
        parent_name = of_clk_get_parent_name(np, 0);
        if (!parent_name)
@@ -430,9 +437,15 @@ void __init of_at91rm9200_clk_usb_setup(struct device_node *np,
 
        of_property_read_string(np, "clock-output-names", &name);
 
-       clk = at91rm9200_clk_register_usb(pmc, name, parent_name, divisors);
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
+               return;
+
+       clk = at91rm9200_clk_register_usb(regmap, name, parent_name, divisors);
        if (IS_ERR(clk))
                return;
 
        of_clk_add_provider(np, of_clk_src_simple_get, clk);
 }
+CLK_OF_DECLARE(at91rm9200_clk_usb, "atmel,at91rm9200-clk-usb",
+              of_at91rm9200_clk_usb_setup);
diff --git a/drivers/clk/at91/clk-utmi.c b/drivers/clk/at91/clk-utmi.c
index ca561e90a60f..61fcf399e58c 100644
--- a/drivers/clk/at91/clk-utmi.c
+++ b/drivers/clk/at91/clk-utmi.c
@@ -11,14 +11,9 @@
 #include <linux/clk-provider.h>
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/io.h>
-#include <linux/sched.h>
-#include <linux/wait.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include "pmc.h"
 
@@ -26,37 +21,30 @@
 
 struct clk_utmi {
        struct clk_hw hw;
-       struct at91_pmc *pmc;
-       unsigned int irq;
-       wait_queue_head_t wait;
+       struct regmap *regmap;
 };
 
 #define to_clk_utmi(hw) container_of(hw, struct clk_utmi, hw)
 
-static irqreturn_t clk_utmi_irq_handler(int irq, void *dev_id)
+static inline bool clk_utmi_ready(struct regmap *regmap)
 {
-       struct clk_utmi *utmi = (struct clk_utmi *)dev_id;
+       unsigned int status;
 
-       wake_up(&utmi->wait);
-       disable_irq_nosync(utmi->irq);
+       regmap_read(regmap, AT91_PMC_SR, &status);
 
-       return IRQ_HANDLED;
+       return status & AT91_PMC_LOCKU;
 }
 
 static int clk_utmi_prepare(struct clk_hw *hw)
 {
        struct clk_utmi *utmi = to_clk_utmi(hw);
-       struct at91_pmc *pmc = utmi->pmc;
-       u32 tmp = pmc_read(pmc, AT91_CKGR_UCKR) | AT91_PMC_UPLLEN |
-                 AT91_PMC_UPLLCOUNT | AT91_PMC_BIASEN;
+       unsigned int uckr = AT91_PMC_UPLLEN | AT91_PMC_UPLLCOUNT |
+                           AT91_PMC_BIASEN;
 
-       pmc_write(pmc, AT91_CKGR_UCKR, tmp);
+       regmap_update_bits(utmi->regmap, AT91_CKGR_UCKR, uckr, uckr);
 
-       while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU)) {
-               enable_irq(utmi->irq);
-               wait_event(utmi->wait,
-                          pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU);
-       }
+       while (!clk_utmi_ready(utmi->regmap))
+               cpu_relax();
 
        return 0;
 }
@@ -64,18 +52,15 @@ static int clk_utmi_prepare(struct clk_hw *hw)
 static int clk_utmi_is_prepared(struct clk_hw *hw)
 {
        struct clk_utmi *utmi = to_clk_utmi(hw);
-       struct at91_pmc *pmc = utmi->pmc;
 
-       return !!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU);
+       return clk_utmi_ready(utmi->regmap);
 }
 
 static void clk_utmi_unprepare(struct clk_hw *hw)
 {
        struct clk_utmi *utmi = to_clk_utmi(hw);
-       struct at91_pmc *pmc = utmi->pmc;
-       u32 tmp = pmc_read(pmc, AT91_CKGR_UCKR) & ~AT91_PMC_UPLLEN;
 
-       pmc_write(pmc, AT91_CKGR_UCKR, tmp);
+       regmap_update_bits(utmi->regmap, AT91_CKGR_UCKR, AT91_PMC_UPLLEN, 0);
 }
 
 static unsigned long clk_utmi_recalc_rate(struct clk_hw *hw,
@@ -93,10 +78,9 @@ static const struct clk_ops utmi_ops = {
 };
 
 static struct clk * __init
-at91_clk_register_utmi(struct at91_pmc *pmc, unsigned int irq,
+at91_clk_register_utmi(struct regmap *regmap,
                       const char *name, const char *parent_name)
 {
-       int ret;
        struct clk_utmi *utmi;
        struct clk *clk = NULL;
        struct clk_init_data init;
@@ -112,52 +96,36 @@ at91_clk_register_utmi(struct at91_pmc *pmc, unsigned int irq,
        init.flags = CLK_SET_RATE_GATE;
 
        utmi->hw.init = &init;
-       utmi->pmc = pmc;
-       utmi->irq = irq;
-       init_waitqueue_head(&utmi->wait);
-       irq_set_status_flags(utmi->irq, IRQ_NOAUTOEN);
-       ret = request_irq(utmi->irq, clk_utmi_irq_handler,
-                         IRQF_TRIGGER_HIGH, "clk-utmi", utmi);
-       if (ret) {
-               kfree(utmi);
-               return ERR_PTR(ret);
-       }
+       utmi->regmap = regmap;
 
        clk = clk_register(NULL, &utmi->hw);
-       if (IS_ERR(clk)) {
-               free_irq(utmi->irq, utmi);
+       if (IS_ERR(clk))
                kfree(utmi);
-       }
 
        return clk;
 }
 
-static void __init
-of_at91_clk_utmi_setup(struct device_node *np, struct at91_pmc *pmc)
+static void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np)
 {
-       unsigned int irq;
        struct clk *clk;
        const char *parent_name;
        const char *name = np->name;
+       struct regmap *regmap;
 
        parent_name = of_clk_get_parent_name(np, 0);
 
        of_property_read_string(np, "clock-output-names", &name);
 
-       irq = irq_of_parse_and_map(np, 0);
-       if (!irq)
+       regmap = syscon_node_to_regmap(of_get_parent(np));
+       if (IS_ERR(regmap))
                return;
 
-       clk = at91_clk_register_utmi(pmc, irq, name, parent_name);
+       clk = at91_clk_register_utmi(regmap, name, parent_name);
        if (IS_ERR(clk))
                return;
 
        of_clk_add_provider(np, of_clk_src_simple_get, clk);
        return;
 }
-
-void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np,
-                                        struct at91_pmc *pmc)
-{
-       of_at91_clk_utmi_setup(np, pmc);
-}
+CLK_OF_DECLARE(at91sam9x5_clk_utmi, "atmel,at91sam9x5-clk-utmi",
+              of_at91sam9x5_clk_utmi_setup);
diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index 8476b570779b..526df5ba042d 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -12,36 +12,13 @@
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/io.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/irqchip/chained_irq.h>
-#include <linux/irqdomain.h>
-#include <linux/of_irq.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
 
 #include <asm/proc-fns.h>
 
 #include "pmc.h"
 
-void __iomem *at91_pmc_base;
-EXPORT_SYMBOL_GPL(at91_pmc_base);
-
-void at91rm9200_idle(void)
-{
-       /*
-        * Disable the processor clock.  The processor will be automatically
-        * re-enabled by an interrupt or by a reset.
-        */
-       at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
-}
-
-void at91sam9_idle(void)
-{
-       at91_pmc_write(AT91_PMC_SCDR, AT91_PMC_PCK);
-       cpu_do_idle();
-}
-
 int of_at91_get_clk_range(struct device_node *np, const char *propname,
                          struct clk_range *range)
 {
@@ -64,402 +41,3 @@ int of_at91_get_clk_range(struct device_node *np, const char *propname,
        return 0;
 }
 EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
-
-static void pmc_irq_mask(struct irq_data *d)
-{
-       struct at91_pmc *pmc = irq_data_get_irq_chip_data(d);
-
-       pmc_write(pmc, AT91_PMC_IDR, 1 << d->hwirq);
-}
-
-static void pmc_irq_unmask(struct irq_data *d)
-{
-       struct at91_pmc *pmc = irq_data_get_irq_chip_data(d);
-
-       pmc_write(pmc, AT91_PMC_IER, 1 << d->hwirq);
-}
-
-static int pmc_irq_set_type(struct irq_data *d, unsigned type)
-{
-       if (type != IRQ_TYPE_LEVEL_HIGH) {
-               pr_warn("PMC: type not supported (support only IRQ_TYPE_LEVEL_HIGH type)\n");
-               return -EINVAL;
-       }
-
-       return 0;
-}
-
-static void pmc_irq_suspend(struct irq_data *d)
-{
-       struct at91_pmc *pmc = irq_data_get_irq_chip_data(d);
-
-       pmc->imr = pmc_read(pmc, AT91_PMC_IMR);
-       pmc_write(pmc, AT91_PMC_IDR, pmc->imr);
-}
-
-static void pmc_irq_resume(struct irq_data *d)
-{
-       struct at91_pmc *pmc = irq_data_get_irq_chip_data(d);
-
-       pmc_write(pmc, AT91_PMC_IER, pmc->imr);
-}
-
-static struct irq_chip pmc_irq = {
-       .name = "PMC",
-       .irq_disable = pmc_irq_mask,
-       .irq_mask = pmc_irq_mask,
-       .irq_unmask = pmc_irq_unmask,
-       .irq_set_type = pmc_irq_set_type,
-       .irq_suspend = pmc_irq_suspend,
-       .irq_resume = pmc_irq_resume,
-};
-
-static struct lock_class_key pmc_lock_class;
-
-static int pmc_irq_map(struct irq_domain *h, unsigned int virq,
-                      irq_hw_number_t hw)
-{
-       struct at91_pmc *pmc = h->host_data;
-
-       irq_set_lockdep_class(virq, &pmc_lock_class);
-
-       irq_set_chip_and_handler(virq, &pmc_irq,
-                                handle_level_irq);
-       irq_set_chip_data(virq, pmc);
-
-       return 0;
-}
-
-static int pmc_irq_domain_xlate(struct irq_domain *d,
-                               struct device_node *ctrlr,
-                               const u32 *intspec, unsigned int intsize,
-                               irq_hw_number_t *out_hwirq,
-                               unsigned int *out_type)
-{
-       struct at91_pmc *pmc = d->host_data;
-       const struct at91_pmc_caps *caps = pmc->caps;
-
-       if (WARN_ON(intsize < 1))
-               return -EINVAL;
-
-       *out_hwirq = intspec[0];
-
-       if (!(caps->available_irqs & (1 << *out_hwirq)))
-               return -EINVAL;
-
-       *out_type = IRQ_TYPE_LEVEL_HIGH;
-
-       return 0;
-}
-
-static const struct irq_domain_ops pmc_irq_ops = {
-       .map    = pmc_irq_map,
-       .xlate  = pmc_irq_domain_xlate,
-};
-
-static irqreturn_t pmc_irq_handler(int irq, void *data)
-{
-       struct at91_pmc *pmc = (struct at91_pmc *)data;
-       unsigned long sr;
-       int n;
-
-       sr = pmc_read(pmc, AT91_PMC_SR) & pmc_read(pmc, AT91_PMC_IMR);
-       if (!sr)
-               return IRQ_NONE;
-
-       for_each_set_bit(n, &sr, BITS_PER_LONG)
-               generic_handle_irq(irq_find_mapping(pmc->irqdomain, n));
-
-       return IRQ_HANDLED;
-}
-
-static const struct at91_pmc_caps at91rm9200_caps = {
-       .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
-                         AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
-                         AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
-                         AT91_PMC_PCK3RDY,
-};
-
-static const struct at91_pmc_caps at91sam9260_caps = {
-       .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
-                         AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
-                         AT91_PMC_PCK1RDY,
-};
-
-static const struct at91_pmc_caps at91sam9g45_caps = {
-       .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
-                         AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
-                         AT91_PMC_PCK1RDY,
-};
-
-static const struct at91_pmc_caps at91sam9n12_caps = {
-       .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_LOCKB |
-                         AT91_PMC_MCKRDY | AT91_PMC_PCK0RDY |
-                         AT91_PMC_PCK1RDY | AT91_PMC_MOSCSELS |
-                         AT91_PMC_MOSCRCS | AT91_PMC_CFDEV,
-};
-
-static const struct at91_pmc_caps at91sam9x5_caps = {
-       .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
-                         AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
-                         AT91_PMC_PCK1RDY | AT91_PMC_MOSCSELS |
-                         AT91_PMC_MOSCRCS | AT91_PMC_CFDEV,
-};
-
-static const struct at91_pmc_caps sama5d2_caps = {
-       .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
-                         AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
-                         AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
-                         AT91_PMC_MOSCSELS | AT91_PMC_MOSCRCS |
-                         AT91_PMC_CFDEV | AT91_PMC_GCKRDY,
-};
-
-static const struct at91_pmc_caps sama5d3_caps = {
-       .available_irqs = AT91_PMC_MOSCS | AT91_PMC_LOCKA | AT91_PMC_MCKRDY |
-                         AT91_PMC_LOCKU | AT91_PMC_PCK0RDY |
-                         AT91_PMC_PCK1RDY | AT91_PMC_PCK2RDY |
-                         AT91_PMC_MOSCSELS | AT91_PMC_MOSCRCS |
-                         AT91_PMC_CFDEV,
-};
-
-static struct at91_pmc *__init at91_pmc_init(struct device_node *np,
-                                            void __iomem *regbase, int virq,
-                                            const struct at91_pmc_caps *caps)
-{
-       struct at91_pmc *pmc;
-
-       if (!regbase || !virq ||  !caps)
-               return NULL;
-
-       at91_pmc_base = regbase;
-
-       pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
-       if (!pmc)
-               return NULL;
-
-       spin_lock_init(&pmc->lock);
-       pmc->regbase = regbase;
-       pmc->virq = virq;
-       pmc->caps = caps;
-
-       pmc->irqdomain = irq_domain_add_linear(np, 32, &pmc_irq_ops, pmc);
-
-       if (!pmc->irqdomain)
-               goto out_free_pmc;
-
-       pmc_write(pmc, AT91_PMC_IDR, 0xffffffff);
-       if (request_irq(pmc->virq, pmc_irq_handler,
-                       IRQF_SHARED | IRQF_COND_SUSPEND, "pmc", pmc))
-               goto out_remove_irqdomain;
-
-       return pmc;
-
-out_remove_irqdomain:
-       irq_domain_remove(pmc->irqdomain);
-out_free_pmc:
-       kfree(pmc);
-
-       return NULL;
-}
-
-static const struct of_device_id pmc_clk_ids[] __initconst = {
-       /* Slow oscillator */
-       {
-               .compatible = "atmel,at91sam9260-clk-slow",
-               .data = of_at91sam9260_clk_slow_setup,
-       },
-       /* Main clock */
-       {
-               .compatible = "atmel,at91rm9200-clk-main-osc",
-               .data = of_at91rm9200_clk_main_osc_setup,
-       },
-       {
-               .compatible = "atmel,at91sam9x5-clk-main-rc-osc",
-               .data = of_at91sam9x5_clk_main_rc_osc_setup,
-       },
-       {
-               .compatible = "atmel,at91rm9200-clk-main",
-               .data = of_at91rm9200_clk_main_setup,
-       },
-       {
-               .compatible = "atmel,at91sam9x5-clk-main",
-               .data = of_at91sam9x5_clk_main_setup,
-       },
-       /* PLL clocks */
-       {
-               .compatible = "atmel,at91rm9200-clk-pll",
-               .data = of_at91rm9200_clk_pll_setup,
-       },
-       {
-               .compatible = "atmel,at91sam9g45-clk-pll",
-               .data = of_at91sam9g45_clk_pll_setup,
-       },
-       {
-               .compatible = "atmel,at91sam9g20-clk-pllb",
-               .data = of_at91sam9g20_clk_pllb_setup,
-       },
-       {
-               .compatible = "atmel,sama5d3-clk-pll",
-               .data = of_sama5d3_clk_pll_setup,
-       },
-       {
-               .compatible = "atmel,at91sam9x5-clk-plldiv",
-               .data = of_at91sam9x5_clk_plldiv_setup,
-       },
-       /* Master clock */
-       {
-               .compatible = "atmel,at91rm9200-clk-master",
-               .data = of_at91rm9200_clk_master_setup,
-       },
-       {
-               .compatible = "atmel,at91sam9x5-clk-master",
-               .data = of_at91sam9x5_clk_master_setup,
-       },
-       /* System clocks */
-       {
-               .compatible = "atmel,at91rm9200-clk-system",
-               .data = of_at91rm9200_clk_sys_setup,
-       },
-       /* Peripheral clocks */
-       {
-               .compatible = "atmel,at91rm9200-clk-peripheral",
-               .data = of_at91rm9200_clk_periph_setup,
-       },
-       {
-               .compatible = "atmel,at91sam9x5-clk-peripheral",
-               .data = of_at91sam9x5_clk_periph_setup,
-       },
-       /* Programmable clocks */
-       {
-               .compatible = "atmel,at91rm9200-clk-programmable",
-               .data = of_at91rm9200_clk_prog_setup,
-       },
-       {
-               .compatible = "atmel,at91sam9g45-clk-programmable",
-               .data = of_at91sam9g45_clk_prog_setup,
-       },
-       {
-               .compatible = "atmel,at91sam9x5-clk-programmable",
-               .data = of_at91sam9x5_clk_prog_setup,
-       },
-       /* UTMI clock */
-#if defined(CONFIG_HAVE_AT91_UTMI)
-       {
-               .compatible = "atmel,at91sam9x5-clk-utmi",
-               .data = of_at91sam9x5_clk_utmi_setup,
-       },
-#endif
-       /* USB clock */
-#if defined(CONFIG_HAVE_AT91_USB_CLK)
-       {
-               .compatible = "atmel,at91rm9200-clk-usb",
-               .data = of_at91rm9200_clk_usb_setup,
-       },
-       {
-               .compatible = "atmel,at91sam9x5-clk-usb",
-               .data = of_at91sam9x5_clk_usb_setup,
-       },
-       {
-               .compatible = "atmel,at91sam9n12-clk-usb",
-               .data = of_at91sam9n12_clk_usb_setup,
-       },
-#endif
-       /* SMD clock */
-#if defined(CONFIG_HAVE_AT91_SMD)
-       {
-               .compatible = "atmel,at91sam9x5-clk-smd",
-               .data = of_at91sam9x5_clk_smd_setup,
-       },
-#endif
-#if defined(CONFIG_HAVE_AT91_H32MX)
-       {
-               .compatible = "atmel,sama5d4-clk-h32mx",
-               .data = of_sama5d4_clk_h32mx_setup,
-       },
-#endif
-#if defined(CONFIG_HAVE_AT91_GENERATED_CLK)
-       {
-               .compatible = "atmel,sama5d2-clk-generated",
-               .data = of_sama5d2_clk_generated_setup,
-       },
-#endif
-       { /*sentinel*/ }
-};
-
-static void __init of_at91_pmc_setup(struct device_node *np,
-                                    const struct at91_pmc_caps *caps)
-{
-       struct at91_pmc *pmc;
-       struct device_node *childnp;
-       void (*clk_setup)(struct device_node *, struct at91_pmc *);
-       const struct of_device_id *clk_id;
-       void __iomem *regbase = of_iomap(np, 0);
-       int virq;
-
-       if (!regbase)
-               return;
-
-       virq = irq_of_parse_and_map(np, 0);
-       if (!virq)
-               return;
-
-       pmc = at91_pmc_init(np, regbase, virq, caps);
-       if (!pmc)
-               return;
-       for_each_child_of_node(np, childnp) {
-               clk_id = of_match_node(pmc_clk_ids, childnp);
-               if (!clk_id)
-                       continue;
-               clk_setup = clk_id->data;
-               clk_setup(childnp, pmc);
-       }
-}
-
-static void __init of_at91rm9200_pmc_setup(struct device_node *np)
-{
-       of_at91_pmc_setup(np, &at91rm9200_caps);
-}
-CLK_OF_DECLARE(at91rm9200_clk_pmc, "atmel,at91rm9200-pmc",
-              of_at91rm9200_pmc_setup);
-
-static void __init of_at91sam9260_pmc_setup(struct device_node *np)
-{
-       of_at91_pmc_setup(np, &at91sam9260_caps);
-}
-CLK_OF_DECLARE(at91sam9260_clk_pmc, "atmel,at91sam9260-pmc",
-              of_at91sam9260_pmc_setup);
-
-static void __init of_at91sam9g45_pmc_setup(struct device_node *np)
-{
-       of_at91_pmc_setup(np, &at91sam9g45_caps);
-}
-CLK_OF_DECLARE(at91sam9g45_clk_pmc, "atmel,at91sam9g45-pmc",
-              of_at91sam9g45_pmc_setup);
-
-static void __init of_at91sam9n12_pmc_setup(struct device_node *np)
-{
-       of_at91_pmc_setup(np, &at91sam9n12_caps);
-}
-CLK_OF_DECLARE(at91sam9n12_clk_pmc, "atmel,at91sam9n12-pmc",
-              of_at91sam9n12_pmc_setup);
-
-static void __init of_at91sam9x5_pmc_setup(struct device_node *np)
-{
-       of_at91_pmc_setup(np, &at91sam9x5_caps);
-}
-CLK_OF_DECLARE(at91sam9x5_clk_pmc, "atmel,at91sam9x5-pmc",
-              of_at91sam9x5_pmc_setup);
-
-static void __init of_sama5d2_pmc_setup(struct device_node *np)
-{
-       of_at91_pmc_setup(np, &sama5d2_caps);
-}
-CLK_OF_DECLARE(sama5d2_clk_pmc, "atmel,sama5d2-pmc",
-              of_sama5d2_pmc_setup);
-
-static void __init of_sama5d3_pmc_setup(struct device_node *np)
-{
-       of_at91_pmc_setup(np, &sama5d3_caps);
-}
-CLK_OF_DECLARE(sama5d3_clk_pmc, "atmel,sama5d3-pmc",
-              of_sama5d3_pmc_setup);
diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
index f65739272779..5771fff0ee3f 100644
--- a/drivers/clk/at91/pmc.h
+++ b/drivers/clk/at91/pmc.h
@@ -14,8 +14,11 @@
 
 #include <linux/io.h>
 #include <linux/irqdomain.h>
+#include <linux/regmap.h>
 #include <linux/spinlock.h>
 
+extern spinlock_t pmc_pcr_lock;
+
 struct clk_range {
        unsigned long min;
        unsigned long max;
@@ -23,102 +26,7 @@ struct clk_range {
 
 #define CLK_RANGE(MIN, MAX) {.min = MIN, .max = MAX,}
 
-struct at91_pmc_caps {
-       u32 available_irqs;
-};
-
-struct at91_pmc {
-       void __iomem *regbase;
-       int virq;
-       spinlock_t lock;
-       const struct at91_pmc_caps *caps;
-       struct irq_domain *irqdomain;
-       u32 imr;
-};
-
-static inline void pmc_lock(struct at91_pmc *pmc)
-{
-       spin_lock(&pmc->lock);
-}
-
-static inline void pmc_unlock(struct at91_pmc *pmc)
-{
-       spin_unlock(&pmc->lock);
-}
-
-static inline u32 pmc_read(struct at91_pmc *pmc, int offset)
-{
-       return readl(pmc->regbase + offset);
-}
-
-static inline void pmc_write(struct at91_pmc *pmc, int offset, u32 value)
-{
-       writel(value, pmc->regbase + offset);
-}
-
 int of_at91_get_clk_range(struct device_node *np, const char *propname,
                          struct clk_range *range);
 
-void of_at91sam9260_clk_slow_setup(struct device_node *np,
-                                  struct at91_pmc *pmc);
-
-void of_at91rm9200_clk_main_osc_setup(struct device_node *np,
-                                     struct at91_pmc *pmc);
-void of_at91sam9x5_clk_main_rc_osc_setup(struct device_node *np,
-                                        struct at91_pmc *pmc);
-void of_at91rm9200_clk_main_setup(struct device_node *np,
-                                 struct at91_pmc *pmc);
-void of_at91sam9x5_clk_main_setup(struct device_node *np,
-                                 struct at91_pmc *pmc);
-
-void of_at91rm9200_clk_pll_setup(struct device_node *np,
-                                struct at91_pmc *pmc);
-void of_at91sam9g45_clk_pll_setup(struct device_node *np,
-                                 struct at91_pmc *pmc);
-void of_at91sam9g20_clk_pllb_setup(struct device_node *np,
-                                  struct at91_pmc *pmc);
-void of_sama5d3_clk_pll_setup(struct device_node *np,
-                             struct at91_pmc *pmc);
-void of_at91sam9x5_clk_plldiv_setup(struct device_node *np,
-                                   struct at91_pmc *pmc);
-
-void of_at91rm9200_clk_master_setup(struct device_node *np,
-                                   struct at91_pmc *pmc);
-void of_at91sam9x5_clk_master_setup(struct device_node *np,
-                                   struct at91_pmc *pmc);
-
-void of_at91rm9200_clk_sys_setup(struct device_node *np,
-                                struct at91_pmc *pmc);
-
-void of_at91rm9200_clk_periph_setup(struct device_node *np,
-                                   struct at91_pmc *pmc);
-void of_at91sam9x5_clk_periph_setup(struct device_node *np,
-                                   struct at91_pmc *pmc);
-
-void of_at91rm9200_clk_prog_setup(struct device_node *np,
-                                 struct at91_pmc *pmc);
-void of_at91sam9g45_clk_prog_setup(struct device_node *np,
-                                  struct at91_pmc *pmc);
-void of_at91sam9x5_clk_prog_setup(struct device_node *np,
-                                 struct at91_pmc *pmc);
-
-void of_at91sam9x5_clk_utmi_setup(struct device_node *np,
-                                 struct at91_pmc *pmc);
-
-void of_at91rm9200_clk_usb_setup(struct device_node *np,
-                                struct at91_pmc *pmc);
-void of_at91sam9x5_clk_usb_setup(struct device_node *np,
-                                struct at91_pmc *pmc);
-void of_at91sam9n12_clk_usb_setup(struct device_node *np,
-                                 struct at91_pmc *pmc);
-
-void of_at91sam9x5_clk_smd_setup(struct device_node *np,
-                                struct at91_pmc *pmc);
-
-void of_sama5d4_clk_h32mx_setup(struct device_node *np,
-                               struct at91_pmc *pmc);
-
-void of_sama5d2_clk_generated_setup(struct device_node *np,
-                                   struct at91_pmc *pmc);
-
 #endif /* __PMC_H_ */
diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
index 4da2af9694a2..5b6f57f500b8 100644
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c
@@ -23,8 +23,7 @@
  *     this 32 bit free-running counter. the second channel is not used.
  *
  *   - The third channel may be used to provide a 16-bit clockevent
- *     source, used in either periodic or oneshot mode.  This runs
- *     at 32 KiHZ, and can handle delays of up to two seconds.
+ *     source, used in either periodic or oneshot mode.
  *
  * A boot clocksource and clockevent source are also currently needed,
  * unless the relevant platforms (ARM/AT91, AVR32/AT32) are changed so
@@ -74,6 +73,8 @@ static struct clocksource clksrc = {
 struct tc_clkevt_device {
        struct clock_event_device       clkevt;
        struct clk                      *clk;
+       bool                            clk_enabled;
+       u32                             freq;
        void __iomem                    *regs;
 };
 
@@ -82,15 +83,26 @@ static struct tc_clkevt_device *to_tc_clkevt(struct clock_event_device *clkevt)
        return container_of(clkevt, struct tc_clkevt_device, clkevt);
 }
 
-/* For now, we always use the 32K clock ... this optimizes for NO_HZ,
- * because using one of the divided clocks would usually mean the
- * tick rate can never be less than several dozen Hz (vs 0.5 Hz).
- *
- * A divided clock could be good for high resolution timers, since
- * 30.5 usec resolution can seem "low".
- */
 static u32 timer_clock;
 
+static void tc_clk_disable(struct clock_event_device *d)
+{
+       struct tc_clkevt_device *tcd = to_tc_clkevt(d);
+
+       clk_disable(tcd->clk);
+       tcd->clk_enabled = false;
+}
+
+static void tc_clk_enable(struct clock_event_device *d)
+{
+       struct tc_clkevt_device *tcd = to_tc_clkevt(d);
+
+       if (tcd->clk_enabled)
+               return;
+       clk_enable(tcd->clk);
+       tcd->clk_enabled = true;
+}
+
 static int tc_shutdown(struct clock_event_device *d)
 {
        struct tc_clkevt_device *tcd = to_tc_clkevt(d);
@@ -98,8 +110,14 @@ static int tc_shutdown(struct clock_event_device *d)
 
        __raw_writel(0xff, regs + ATMEL_TC_REG(2, IDR));
        __raw_writel(ATMEL_TC_CLKDIS, regs + ATMEL_TC_REG(2, CCR));
+       return 0;
+}
+
+static int tc_shutdown_clk_off(struct clock_event_device *d)
+{
+       tc_shutdown(d);
        if (!clockevent_state_detached(d))
-               clk_disable(tcd->clk);
+               tc_clk_disable(d);
 
        return 0;
 }
@@ -112,9 +130,9 @@ static int tc_set_oneshot(struct clock_event_device *d)
        if (clockevent_state_oneshot(d) || clockevent_state_periodic(d))
                tc_shutdown(d);
 
-       clk_enable(tcd->clk);
+       tc_clk_enable(d);
 
-       /* slow clock, count up to RC, then irq and stop */
+       /* count up to RC, then irq and stop */
        __raw_writel(timer_clock | ATMEL_TC_CPCSTOP | ATMEL_TC_WAVE |
                     ATMEL_TC_WAVESEL_UP_AUTO, regs + ATMEL_TC_REG(2, CMR));
        __raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
@@ -134,12 +152,12 @@ static int tc_set_periodic(struct clock_event_device *d)
        /* By not making the gentime core emulate periodic mode on top
         * of oneshot, we get lower overhead and improved accuracy.
         */
-       clk_enable(tcd->clk);
+       tc_clk_enable(d);
 
-       /* slow clock, count up to RC, then irq and restart */
+       /* count up to RC, then irq and restart */
        __raw_writel(timer_clock | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO,
                     regs + ATMEL_TC_REG(2, CMR));
-       __raw_writel((32768 + HZ / 2) / HZ, tcaddr + ATMEL_TC_REG(2, RC));
+       __raw_writel((tcd->freq + HZ / 2) / HZ, tcaddr + ATMEL_TC_REG(2, RC));
 
        /* Enable clock and interrupts on RC compare */
        __raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
@@ -166,9 +184,13 @@ static struct tc_clkevt_device clkevt = {
                .features               = CLOCK_EVT_FEAT_PERIODIC |
                                          CLOCK_EVT_FEAT_ONESHOT,
                /* Should be lower than at91rm9200's system timer */
+#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK
                .rating                 = 125,
+#else
+               .rating                 = 200,
+#endif
                .set_next_event         = tc_next_event,
-               .set_state_shutdown     = tc_shutdown,
+               .set_state_shutdown     = tc_shutdown_clk_off,
                .set_state_periodic     = tc_set_periodic,
                .set_state_oneshot      = tc_set_oneshot,
        },
@@ -188,8 +210,9 @@ static irqreturn_t ch2_irq(int irq, void *handle)
        return IRQ_NONE;
 }
 
-static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
+static int __init setup_clkevents(struct atmel_tc *tc, int divisor_idx)
 {
+       unsigned divisor = atmel_tc_divisors[divisor_idx];
        int ret;
        struct clk *t2_clk = tc->clk[2];
        int irq = tc->irq[2];
@@ -210,7 +233,11 @@ static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
        clkevt.regs = tc->regs;
        clkevt.clk = t2_clk;
 
-       timer_clock = clk32k_divisor_idx;
+       timer_clock = divisor_idx;
+       if (!divisor)
+               clkevt.freq = 32768;
+       else
+               clkevt.freq = clk_get_rate(t2_clk) / divisor;
 
        clkevt.clkevt.cpumask = cpumask_of(0);
 
@@ -221,7 +248,7 @@ static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
                return ret;
        }
 
-       clockevents_config_and_register(&clkevt.clkevt, 32768, 1, 0xffff);
+       clockevents_config_and_register(&clkevt.clkevt, clkevt.freq, 1, 0xffff);
 
        return ret;
 }
@@ -358,7 +385,11 @@ static int __init tcb_clksrc_init(void)
                goto err_disable_t1;
 
        /* channel 2:  periodic and oneshot timer support */
+#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK
        ret = setup_clkevents(tc, clk32k_divisor_idx);
+#else
+       ret = setup_clkevents(tc, best_divisor_idx);
+#endif
        if (ret)
                goto err_unregister_clksrc;
 
diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c
index d911c5dca8f1..7a40f7e88468 100644
--- a/drivers/clocksource/timer-atmel-pit.c
+++ b/drivers/clocksource/timer-atmel-pit.c
@@ -46,6 +46,7 @@ struct pit_data {
        u32             cycle;
        u32             cnt;
        unsigned int    irq;
+       bool            irq_requested;
        struct clk      *mck;
 };
 
@@ -96,15 +97,29 @@ static int pit_clkevt_shutdown(struct clock_event_device *dev)
 
        /* disable irq, leaving the clocksource active */
        pit_write(data->base, AT91_PIT_MR, (data->cycle - 1) | AT91_PIT_PITEN);
+       if (data->irq_requested) {
+               free_irq(data->irq, data);
+               data->irq_requested = false;
+       }
        return 0;
 }
 
+static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id);
 /*
  * Clockevent device:  interrupts every 1/HZ (== pit_cycles * MCK/16)
  */
 static int pit_clkevt_set_periodic(struct clock_event_device *dev)
 {
        struct pit_data *data = clkevt_to_pit_data(dev);
+       int ret;
+
+       ret = request_irq(data->irq, at91sam926x_pit_interrupt,
+                         IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
+                         "at91_tick", data);
+       if (ret)
+               panic(pr_fmt("Unable to setup IRQ\n"));
+
+       data->irq_requested = true;
 
        /* update clocksource counter */
        data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR));
@@ -181,7 +196,6 @@ static void __init at91sam926x_pit_common_init(struct pit_data *data)
 {
        unsigned long   pit_rate;
        unsigned        bits;
-       int             ret;
 
        /*
         * Use our actual MCK to figure out how many MCK/16 ticks per
@@ -206,13 +220,6 @@ static void __init at91sam926x_pit_common_init(struct pit_data *data)
        data->clksrc.flags = CLOCK_SOURCE_IS_CONTINUOUS;
        clocksource_register_hz(&data->clksrc, pit_rate);
 
-       /* Set up irq handler */
-       ret = request_irq(data->irq, at91sam926x_pit_interrupt,
-                         IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
-                         "at91_tick", data);
-       if (ret)
-               panic(pr_fmt("Unable to setup IRQ\n"));
-
        /* Set up and register clockevents */
        data->clkevt.name = "pit";
        data->clkevt.features = CLOCK_EVT_FEAT_PERIODIC;
diff --git a/drivers/clocksource/timer-atmel-st.c b/drivers/clocksource/timer-atmel-st.c
index 29d21d68df5a..103d0fd70cc4 100644
--- a/drivers/clocksource/timer-atmel-st.c
+++ b/drivers/clocksource/timer-atmel-st.c
@@ -115,18 +115,29 @@ static void clkdev32k_disable_and_flush_irq(void)
        last_crtr = read_CRTR();
 }
 
+static int atmel_st_irq;
+
 static int clkevt32k_shutdown(struct clock_event_device *evt)
 {
        clkdev32k_disable_and_flush_irq();
        irqmask = 0;
        regmap_write(regmap_st, AT91_ST_IER, irqmask);
+       free_irq(atmel_st_irq, regmap_st);
        return 0;
 }
 
 static int clkevt32k_set_oneshot(struct clock_event_device *dev)
 {
+       int ret;
+
        clkdev32k_disable_and_flush_irq();
 
+       ret = request_irq(atmel_st_irq, at91rm9200_timer_interrupt,
+                         IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
+                         "at91_tick", regmap_st);
+       if (ret)
+               panic(pr_fmt("Unable to setup IRQ\n"));
+
        /*
         * ALM for oneshot irqs, set by next_event()
         * before 32 seconds have passed.
@@ -139,8 +150,16 @@ static int clkevt32k_set_oneshot(struct clock_event_device *dev)
 
 static int clkevt32k_set_periodic(struct clock_event_device *dev)
 {
+       int ret;
+
        clkdev32k_disable_and_flush_irq();
 
+       ret = request_irq(atmel_st_irq, at91rm9200_timer_interrupt,
+                         IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
+                         "at91_tick", regmap_st);
+       if (ret)
+               panic(pr_fmt("Unable to setup IRQ\n"));
+
        /* PIT for periodic irqs; fixed rate of 1/HZ */
        irqmask = AT91_ST_PITS;
        regmap_write(regmap_st, AT91_ST_PIMR, timer_latch);
@@ -198,7 +217,7 @@ static void __init atmel_st_timer_init(struct device_node *node)
 {
        struct clk *sclk;
        unsigned int sclk_rate, val;
-       int irq, ret;
+       int ret;
 
        regmap_st = syscon_node_to_regmap(node);
        if (IS_ERR(regmap_st))
@@ -210,17 +229,10 @@ static void __init atmel_st_timer_init(struct device_node *node)
        regmap_read(regmap_st, AT91_ST_SR, &val);
 
        /* Get the interrupts property */
-       irq  = irq_of_parse_and_map(node, 0);
-       if (!irq)
+       atmel_st_irq  = irq_of_parse_and_map(node, 0);
+       if (!atmel_st_irq)
                panic(pr_fmt("Unable to get IRQ from DT\n"));
 
-       /* Make IRQs happen for the system timer */
-       ret = request_irq(irq, at91rm9200_timer_interrupt,
-                         IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
-                         "at91_tick", regmap_st);
-       if (ret)
-               panic(pr_fmt("Unable to setup IRQ\n"));
-
        sclk = of_clk_get(node, 0);
        if (IS_ERR(sclk))
                panic(pr_fmt("Unable to get slow clock\n"));
diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86
index c59bdcb83217..8f23161d80be 100644
--- a/drivers/cpufreq/Kconfig.x86
+++ b/drivers/cpufreq/Kconfig.x86
@@ -123,7 +123,7 @@ config X86_POWERNOW_K7_ACPI
 
 config X86_POWERNOW_K8
        tristate "AMD Opteron/Athlon64 PowerNow!"
-       depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
+       depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ && !PREEMPT_RT_BASE
        help
          This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
          Support for K10 and newer processors is now in acpi-cpufreq.
diff --git a/drivers/cpuidle/coupled.c b/drivers/cpuidle/coupled.c
index 344058f8501a..d5657d50ac40 100644
--- a/drivers/cpuidle/coupled.c
+++ b/drivers/cpuidle/coupled.c
@@ -119,7 +119,6 @@ struct cpuidle_coupled {
 
 #define CPUIDLE_COUPLED_NOT_IDLE       (-1)
 
-static DEFINE_MUTEX(cpuidle_coupled_lock);
 static DEFINE_PER_CPU(struct call_single_data, cpuidle_coupled_poke_cb);
 
 /*
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 6ed7d63a0688..9da7482ad256 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1264,7 +1264,9 @@ i915_gem_ringbuffer_submission(struct i915_execbuffer_params *params,
        if (ret)
                return ret;
 
+#ifndef CONFIG_PREEMPT_RT_BASE
        trace_i915_gem_ring_dispatch(params->request, params->dispatch_flags);
+#endif
 
        i915_gem_execbuffer_move_to_active(vmas, params->request);
        i915_gem_execbuffer_retire_commands(params);
diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c b/drivers/gpu/drm/i915/i915_gem_shrinker.c
index c0a96f1ee18e..deb1e207fa3c 100644
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c
@@ -39,7 +39,7 @@ static bool mutex_is_locked_by(struct mutex *mutex, struct task_struct *task)
        if (!mutex_is_locked(mutex))
                return false;
 
-#if defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_MUTEX_SPIN_ON_OWNER)
+#if (defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_MUTEX_SPIN_ON_OWNER)) && !defined(CONFIG_PREEMPT_RT_BASE)
        return mutex->owner == task;
 #else
        /* Since UP may be pre-empted, we cannot assume that we own the lock */
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index b7b0a38acd67..148dcb1349d5 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -812,6 +812,7 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
        spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 
        /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
+       preempt_disable_rt();
 
        /* Get optional system timestamp before query. */
        if (stime)
@@ -863,6 +864,7 @@ static int i915_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
                *etime = ktime_get();
 
        /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */
+       preempt_enable_rt();
 
        spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 4f5d07bb3511..8ecd5c016dba 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11400,7 +11400,7 @@ void intel_check_page_flip(struct drm_device *dev, int pipe)
        struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
        struct intel_unpin_work *work;
 
-       WARN_ON(!in_interrupt());
+       WARN_ON_NONRT(!in_interrupt());
 
        if (crtc == NULL)
                return;
diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 2cc6aa072f4c..b79d33f14868 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/drivers/gpu/drm/i915/intel_sprite.c
@@ -38,6 +38,7 @@
 #include "intel_drv.h"
 #include <drm/i915_drm.h>
 #include "i915_drv.h"
+#include <linux/locallock.h>
 
 static bool
 format_is_yuv(uint32_t format)
@@ -64,6 +65,8 @@ static int usecs_to_scanlines(const struct drm_display_mode *adjusted_mode,
                            1000 * adjusted_mode->crtc_htotal);
 }
 
+static DEFINE_LOCAL_IRQ_LOCK(pipe_update_lock);
+
 /**
  * intel_pipe_update_start() - start update of a set of display registers
  * @crtc: the crtc of which the registers are going to be updated
@@ -96,7 +99,7 @@ void intel_pipe_update_start(struct intel_crtc *crtc)
        min = vblank_start - usecs_to_scanlines(adjusted_mode, 100);
        max = vblank_start - 1;
 
-       local_irq_disable();
+       local_lock_irq(pipe_update_lock);
 
        if (min <= 0 || max <= 0)
                return;
@@ -126,11 +129,11 @@ void intel_pipe_update_start(struct intel_crtc *crtc)
                        break;
                }
 
-               local_irq_enable();
+               local_unlock_irq(pipe_update_lock);
 
                timeout = schedule_timeout(timeout);
 
-               local_irq_disable();
+               local_lock_irq(pipe_update_lock);
        }
 
        finish_wait(wq, &wait);
@@ -164,7 +167,7 @@ void intel_pipe_update_end(struct intel_crtc *crtc)
 
        trace_i915_pipe_update_end(crtc, end_vbl_count, scanline_end);
 
-       local_irq_enable();
+       local_unlock_irq(pipe_update_lock);
 
        if (crtc->debug.start_vbl_count &&
            crtc->debug.start_vbl_count != end_vbl_count) {
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 3645b223aa37..642854b2ed2c 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -1862,6 +1862,7 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
        struct radeon_device *rdev = dev->dev_private;
 
        /* preempt_disable_rt() should go right here in PREEMPT_RT patchset. */
+       preempt_disable_rt();
 
        /* Get optional system timestamp before query. */
        if (stime)
@@ -1954,6 +1955,7 @@ int radeon_get_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
                *etime = ktime_get();
 
        /* preempt_enable_rt() should go right here in PREEMPT_RT patchset. */
+       preempt_enable_rt();
 
        /* Decode into vertical and horizontal scanout position. */
        *vpos = position & 0x1fff;
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 802dcb409030..d6d9427860d8 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -820,7 +820,7 @@ static void vmbus_isr(void)
                        tasklet_schedule(&msg_dpc);
        }
 
-       add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0);
+       add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0, 0);
 }
 
 
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 08d26ba61ed3..46b89dd42b10 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -995,15 +995,12 @@ omap_i2c_isr(int irq, void *dev_id)
        u16 mask;
        u16 stat;
 
-       spin_lock(&omap->lock);
-       mask = omap_i2c_read_reg(omap, OMAP_I2C_IE_REG);
        stat = omap_i2c_read_reg(omap, OMAP_I2C_STAT_REG);
+       mask = omap_i2c_read_reg(omap, OMAP_I2C_IE_REG);
 
        if (stat & mask)
                ret = IRQ_WAKE_THREAD;
 
-       spin_unlock(&omap->lock);
-
        return ret;
 }
 
diff --git a/drivers/ide/alim15x3.c b/drivers/ide/alim15x3.c
index 36f76e28a0bf..394f142f90c7 100644
--- a/drivers/ide/alim15x3.c
+++ b/drivers/ide/alim15x3.c
@@ -234,7 +234,7 @@ static int init_chipset_ali15x3(struct pci_dev *dev)
 
        isa_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
 
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
 
        if (m5229_revision < 0xC2) {
                /*
@@ -325,7 +325,7 @@ static int init_chipset_ali15x3(struct pci_dev *dev)
        }
        pci_dev_put(north);
        pci_dev_put(isa_dev);
-       local_irq_restore(flags);
+       local_irq_restore_nort(flags);
        return 0;
 }
 
diff --git a/drivers/ide/hpt366.c b/drivers/ide/hpt366.c
index 696b6c1ec940..0d0a96629b73 100644
--- a/drivers/ide/hpt366.c
+++ b/drivers/ide/hpt366.c
@@ -1241,7 +1241,7 @@ static int init_dma_hpt366(ide_hwif_t *hwif,
 
        dma_old = inb(base + 2);
 
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
 
        dma_new = dma_old;
        pci_read_config_byte(dev, hwif->channel ? 0x4b : 0x43, &masterdma);
@@ -1252,7 +1252,7 @@ static int init_dma_hpt366(ide_hwif_t *hwif,
        if (dma_new != dma_old)
                outb(dma_new, base + 2);
 
-       local_irq_restore(flags);
+       local_irq_restore_nort(flags);
 
        printk(KERN_INFO "    %s: BM-DMA at 0x%04lx-0x%04lx\n",
                         hwif->name, base, base + 7);
diff --git a/drivers/ide/ide-io-std.c b/drivers/ide/ide-io-std.c
index 19763977568c..4169433faab5 100644
--- a/drivers/ide/ide-io-std.c
+++ b/drivers/ide/ide-io-std.c
@@ -175,7 +175,7 @@ void ide_input_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf,
                unsigned long uninitialized_var(flags);
 
                if ((io_32bit & 2) && !mmio) {
-                       local_irq_save(flags);
+                       local_irq_save_nort(flags);
                        ata_vlb_sync(io_ports->nsect_addr);
                }
 
@@ -186,7 +186,7 @@ void ide_input_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf,
                        insl(data_addr, buf, words);
 
                if ((io_32bit & 2) && !mmio)
-                       local_irq_restore(flags);
+                       local_irq_restore_nort(flags);
 
                if (((len + 1) & 3) < 2)
                        return;
@@ -219,7 +219,7 @@ void ide_output_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf,
                unsigned long uninitialized_var(flags);
 
                if ((io_32bit & 2) && !mmio) {
-                       local_irq_save(flags);
+                       local_irq_save_nort(flags);
                        ata_vlb_sync(io_ports->nsect_addr);
                }
 
@@ -230,7 +230,7 @@ void ide_output_data(ide_drive_t *drive, struct ide_cmd *cmd, void *buf,
                        outsl(data_addr, buf, words);
 
                if ((io_32bit & 2) && !mmio)
-                       local_irq_restore(flags);
+                       local_irq_restore_nort(flags);
 
                if (((len + 1) & 3) < 2)
                        return;
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 669ea1e45795..e12e43e62245 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -659,7 +659,7 @@ void ide_timer_expiry (unsigned long data)
                /* disable_irq_nosync ?? */
                disable_irq(hwif->irq);
                /* local CPU only, as if we were handling an interrupt */
-               local_irq_disable();
+               local_irq_disable_nort();
                if (hwif->polling) {
                        startstop = handler(drive);
                } else if (drive_is_ready(drive)) {
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 376f2dc410c5..f014dd1b73dc 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -129,12 +129,12 @@ int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
                                if ((stat & ATA_BUSY) == 0)
                                        break;
 
-                               local_irq_restore(flags);
+                               local_irq_restore_nort(flags);
                                *rstat = stat;
                                return -EBUSY;
                        }
                }
-               local_irq_restore(flags);
+               local_irq_restore_nort(flags);
        }
        /*
         * Allow status to settle, then read it again.
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 0b63facd1d87..4ceba37afc0c 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -196,10 +196,10 @@ static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id)
        int bswap = 1;
 
        /* local CPU only; some systems need this */
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
        /* read 512 bytes of id info */
        hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
-       local_irq_restore(flags);
+       local_irq_restore_nort(flags);
 
        drive->dev_flags |= IDE_DFLAG_ID_READ;
 #ifdef DEBUG
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index a716693417a3..be0568c722d6 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -250,7 +250,7 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
 
                page_is_high = PageHighMem(page);
                if (page_is_high)
-                       local_irq_save(flags);
+                       local_irq_save_nort(flags);
 
                buf = kmap_atomic(page) + offset;
 
@@ -271,7 +271,7 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
                kunmap_atomic(buf);
 
                if (page_is_high)
-                       local_irq_restore(flags);
+                       local_irq_restore_nort(flags);
 
                len -= nr_bytes;
        }
@@ -414,7 +414,7 @@ static ide_startstop_t pre_task_out_intr(ide_drive_t *drive,
        }
 
        if ((drive->dev_flags & IDE_DFLAG_UNMASK) == 0)
-               local_irq_disable();
+               local_irq_disable_nort();
 
        ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE);
 
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index 5580ab0b5781..a123d0439c4c 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -862,7 +862,7 @@ void ipoib_mcast_restart_task(struct work_struct *work)
 
        ipoib_dbg_mcast(priv, "restarting multicast task\n");
 
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
        netif_addr_lock(dev);
        spin_lock(&priv->lock);
 
@@ -944,7 +944,7 @@ void ipoib_mcast_restart_task(struct work_struct *work)
 
        spin_unlock(&priv->lock);
        netif_addr_unlock(dev);
-       local_irq_restore(flags);
+       local_irq_restore_nort(flags);
 
        /*
         * make sure the in-flight joins have finished before we attempt
diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
index 4a2a9e370be7..e970d9afd179 100644
--- a/drivers/input/gameport/gameport.c
+++ b/drivers/input/gameport/gameport.c
@@ -91,13 +91,13 @@ static int gameport_measure_speed(struct gameport *gameport)
        tx = ~0;
 
        for (i = 0; i < 50; i++) {
-               local_irq_save(flags);
+               local_irq_save_nort(flags);
                t1 = ktime_get_ns();
                for (t = 0; t < 50; t++)
                        gameport_read(gameport);
                t2 = ktime_get_ns();
                t3 = ktime_get_ns();
-               local_irq_restore(flags);
+               local_irq_restore_nort(flags);
                udelay(i * 10);
                t = (t2 - t1) - (t3 - t2);
                if (t < tx)
@@ -124,12 +124,12 @@ static int old_gameport_measure_speed(struct gameport *gameport)
        tx = 1 << 30;
 
        for(i = 0; i < 50; i++) {
-               local_irq_save(flags);
+               local_irq_save_nort(flags);
                GET_TIME(t1);
                for (t = 0; t < 50; t++) gameport_read(gameport);
                GET_TIME(t2);
                GET_TIME(t3);
-               local_irq_restore(flags);
+               local_irq_restore_nort(flags);
                udelay(i * 10);
                if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t;
        }
@@ -148,11 +148,11 @@ static int old_gameport_measure_speed(struct gameport *gameport)
        tx = 1 << 30;
 
        for(i = 0; i < 50; i++) {
-               local_irq_save(flags);
+               local_irq_save_nort(flags);
                t1 = rdtsc();
                for (t = 0; t < 50; t++) gameport_read(gameport);
                t2 = rdtsc();
-               local_irq_restore(flags);
+               local_irq_restore_nort(flags);
                udelay(i * 10);
                if (t2 - t1 < tx) tx = t2 - t1;
        }
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 52c36394dba5..d777d0197f64 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2022,10 +2022,10 @@ static int __attach_device(struct iommu_dev_data *dev_data,
        int ret;
 
        /*
-        * Must be called with IRQs disabled. Warn here to detect early
-        * when its not.
+        * Must be called with IRQs disabled on a non RT kernel. Warn here to
+        * detect early when its not.
         */
-       WARN_ON(!irqs_disabled());
+       WARN_ON_NONRT(!irqs_disabled());
 
        /* lock domain */
        spin_lock(&domain->lock);
@@ -2188,10 +2188,10 @@ static void __detach_device(struct iommu_dev_data *dev_data)
        struct protection_domain *domain;
 
        /*
-        * Must be called with IRQs disabled. Warn here to detect early
-        * when its not.
+        * Must be called with IRQs disabled on a non RT kernel. Warn here to
+        * detect early when its not.
         */
-       WARN_ON(!irqs_disabled());
+       WARN_ON_NONRT(!irqs_disabled());
 
        if (WARN_ON(!dev_data->domain))
                return;
diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig
index 5bda6a9b56bb..d6286584c807 100644
--- a/drivers/leds/trigger/Kconfig
+++ b/drivers/leds/trigger/Kconfig
@@ -61,7 +61,7 @@ config LEDS_TRIGGER_BACKLIGHT
 
 config LEDS_TRIGGER_CPU
        bool "LED CPU Trigger"
-       depends on LEDS_TRIGGERS
+       depends on LEDS_TRIGGERS && !PREEMPT_RT_BASE
        help
          This allows LEDs to be controlled by active CPUs. This shows
          the active CPUs across an array of LEDs so you can see which
diff --git a/drivers/md/bcache/Kconfig b/drivers/md/bcache/Kconfig
index 4d200883c505..98b64ed5cb81 100644
--- a/drivers/md/bcache/Kconfig
+++ b/drivers/md/bcache/Kconfig
@@ -1,6 +1,7 @@
 
 config BCACHE
        tristate "Block device as cache"
+       depends on !PREEMPT_RT_FULL
        ---help---
        Allows a block device to be used as cache for other devices; uses
        a btree for indexing and the layout is optimized for SSDs.
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 9ec6948e3b8b..ecbc23575114 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2185,7 +2185,7 @@ static void dm_request_fn(struct request_queue *q)
                /* Establish tio->ti before queuing work (map_tio_request) */
                tio->ti = ti;
                queue_kthread_work(&md->kworker, &tio->work);
-               BUG_ON(!irqs_disabled());
+               BUG_ON_NONRT(!irqs_disabled());
        }
 
        goto out;
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 86ab6d14d782..573b9ac810da 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -429,7 +429,7 @@ void raid5_release_stripe(struct stripe_head *sh)
                md_wakeup_thread(conf->mddev->thread);
        return;
 slow_path:
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
        /* we are ok here if STRIPE_ON_RELEASE_LIST is set or not */
        if (atomic_dec_and_lock(&sh->count, &conf->device_lock)) {
                INIT_LIST_HEAD(&list);
@@ -438,7 +438,7 @@ void raid5_release_stripe(struct stripe_head *sh)
                spin_unlock(&conf->device_lock);
                release_inactive_stripe_list(conf, &list, hash);
        }
-       local_irq_restore(flags);
+       local_irq_restore_nort(flags);
 }
 
 static inline void remove_hash(struct stripe_head *sh)
@@ -1929,8 +1929,9 @@ static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
        struct raid5_percpu *percpu;
        unsigned long cpu;
 
-       cpu = get_cpu();
+       cpu = get_cpu_light();
        percpu = per_cpu_ptr(conf->percpu, cpu);
+       spin_lock(&percpu->lock);
        if (test_bit(STRIPE_OP_BIOFILL, &ops_request)) {
                ops_run_biofill(sh);
                overlap_clear++;
@@ -1986,7 +1987,8 @@ static void raid_run_ops(struct stripe_head *sh, unsigned long ops_request)
                        if (test_and_clear_bit(R5_Overlap, &dev->flags))
                                wake_up(&sh->raid_conf->wait_for_overlap);
                }
-       put_cpu();
+       spin_unlock(&percpu->lock);
+       put_cpu_light();
 }
 
 static struct stripe_head *alloc_stripe(struct kmem_cache *sc, gfp_t gfp)
@@ -6433,6 +6435,7 @@ static int raid5_alloc_percpu(struct r5conf *conf)
                               __func__, cpu);
                        break;
                }
+               spin_lock_init(&per_cpu_ptr(conf->percpu, cpu)->lock);
        }
        put_online_cpus();
 
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 517d4b68a1be..efe91887ecd7 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -504,6 +504,7 @@ struct r5conf {
        int                     recovery_disabled;
        /* per cpu variables */
        struct raid5_percpu {
+               spinlock_t      lock;           /* Protection for -RT */
                struct page     *spare_page; /* Used when checking P/Q in raid6 */
                struct flex_array *scribble;   /* space for constructing buffer
                                              * lists and performing address
diff --git a/drivers/media/platform/vsp1/vsp1_video.c b/drivers/media/platform/vsp1/vsp1_video.c
index 5ce88e1f5d71..b4f8cd74ecb8 100644
--- a/drivers/media/platform/vsp1/vsp1_video.c
+++ b/drivers/media/platform/vsp1/vsp1_video.c
@@ -520,7 +520,7 @@ static bool vsp1_pipeline_stopped(struct vsp1_pipeline *pipe)
        bool stopped;
 
        spin_lock_irqsave(&pipe->irqlock, flags);
-       stopped = pipe->state == VSP1_PIPELINE_STOPPED,
+       stopped = pipe->state == VSP1_PIPELINE_STOPPED;
        spin_unlock_irqrestore(&pipe->irqlock, flags);
 
        return stopped;
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 4bf7d50b1bc7..6f7e99ad6e29 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -54,6 +54,7 @@ config AD525X_DPOT_SPI
 config ATMEL_TCLIB
        bool "Atmel AT32/AT91 Timer/Counter Library"
        depends on (AVR32 || ARCH_AT91)
+       default y if PREEMPT_RT_FULL
        help
          Select this if you want a library to allocate the Timer/Counter
          blocks found on many Atmel processors.  This facilitates using
@@ -69,8 +70,7 @@ config ATMEL_TCB_CLKSRC
          are combined to make a single 32-bit timer.
 
          When GENERIC_CLOCKEVENTS is defined, the third timer channel
-         may be used as a clock event device supporting oneshot mode
-         (delays of up to two seconds) based on the 32 KiHz clock.
+         may be used as a clock event device supporting oneshot mode.
 
 config ATMEL_TCB_CLKSRC_BLOCK
        int
@@ -84,6 +84,15 @@ config ATMEL_TCB_CLKSRC_BLOCK
          TC can be used for other purposes, such as PWM generation and
          interval timing.
 
+config ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK
+       bool "TC Block use 32 KiHz clock"
+       depends on ATMEL_TCB_CLKSRC
+       default y if !PREEMPT_RT_FULL
+       help
+         Select this to use 32 KiHz base clock rate as TC block clock
+         source for clock events.
+
+
 config DUMMY_IRQ
        tristate "Dummy IRQ handler"
        default n
@@ -113,6 +122,35 @@ config IBM_ASM
          for information on the specific driver level and support statement
          for your IBM server.
 
+config HWLAT_DETECTOR
+       tristate "Testing module to detect hardware-induced latencies"
+       depends on DEBUG_FS
+       depends on RING_BUFFER
+       default m
+       ---help---
+         A simple hardware latency detector. Use this module to detect
+         large latencies introduced by the behavior of the underlying
+         system firmware external to Linux. We do this using periodic
+         use of stop_machine to grab all available CPUs and measure
+         for unexplainable gaps in the CPU timestamp counter(s). By
+         default, the module is not enabled until the "enable" file
+         within the "hwlat_detector" debugfs directory is toggled.
+
+         This module is often used to detect SMI (System Management
+         Interrupts) on x86 systems, though is not x86 specific. To
+         this end, we default to using a sample window of 1 second,
+         during which we will sample for 0.5 seconds. If an SMI or
+         similar event occurs during that time, it is recorded
+         into an 8K samples global ring buffer until retreived.
+
+         WARNING: This software should never be enabled (it can be built
+         but should not be turned on after it is loaded) in a production
+         environment where high latencies are a concern since the
+         sampling mechanism actually introduces latencies for
+         regular tasks while the CPU(s) are being held.
+
+         If unsure, say N
+
 config PHANTOM
        tristate "Sensable PHANToM (PCI)"
        depends on PCI
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 537d7f3b78da..ec4aecba0656 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_C2PORT)          += c2port/
 obj-$(CONFIG_HMC6352)          += hmc6352.o
 obj-y                          += eeprom/
 obj-y                          += cb710/
+obj-$(CONFIG_HWLAT_DETECTOR)   += hwlat_detector.o
 obj-$(CONFIG_SPEAR13XX_PCIE_GADGET)    += spear13xx_pcie_gadget.o
 obj-$(CONFIG_VMWARE_BALLOON)   += vmw_balloon.o
 obj-$(CONFIG_ARM_CHARLCD)      += arm-charlcd.o
diff --git a/drivers/misc/hwlat_detector.c b/drivers/misc/hwlat_detector.c
new file mode 100644
index 000000000000..52f5ad5fd9c0
--- /dev/null
+++ b/drivers/misc/hwlat_detector.c
@@ -0,0 +1,1240 @@
+/*
+ * hwlat_detector.c - A simple Hardware Latency detector.
+ *
+ * Use this module to detect large system latencies induced by the behavior of
+ * certain underlying system hardware or firmware, independent of Linux itself.
+ * The code was developed originally to detect the presence of SMIs on Intel
+ * and AMD systems, although there is no dependency upon x86 herein.
+ *
+ * The classical example usage of this module is in detecting the presence of
+ * SMIs or System Management Interrupts on Intel and AMD systems. An SMI is a
+ * somewhat special form of hardware interrupt spawned from earlier CPU debug
+ * modes in which the (BIOS/EFI/etc.) firmware arranges for the South Bridge
+ * LPC (or other device) to generate a special interrupt under certain
+ * circumstances, for example, upon expiration of a special SMI timer device,
+ * due to certain external thermal readings, on certain I/O address accesses,
+ * and other situations. An SMI hits a special CPU pin, triggers a special
+ * SMI mode (complete with special memory map), and the OS is unaware.
+ *
+ * Although certain hardware-inducing latencies are necessary (for example,
+ * a modern system often requires an SMI handler for correct thermal control
+ * and remote management) they can wreak havoc upon any OS-level performance
+ * guarantees toward low-latency, especially when the OS is not even made
+ * aware of the presence of these interrupts. For this reason, we need a
+ * somewhat brute force mechanism to detect these interrupts. In this case,
+ * we do it by hogging all of the CPU(s) for configurable timer intervals,
+ * sampling the built-in CPU timer, looking for discontiguous readings.
+ *
+ * WARNING: This implementation necessarily introduces latencies. Therefore,
+ *          you should NEVER use this module in a production environment
+ *          requiring any kind of low-latency performance guarantee(s).
+ *
+ * Copyright (C) 2008-2009 Jon Masters, Red Hat, Inc. <jcm@redhat.com>
+ *
+ * Includes useful feedback from Clark Williams <clark@redhat.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/ring_buffer.h>
+#include <linux/time.h>
+#include <linux/hrtimer.h>
+#include <linux/kthread.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/version.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/trace_clock.h>
+
+#define BUF_SIZE_DEFAULT       262144UL                /* 8K*(sizeof(entry)) */
+#define BUF_FLAGS              (RB_FL_OVERWRITE)       /* no block on full */
+#define U64STR_SIZE            22                      /* 20 digits max */
+
+#define VERSION                        "1.0.0"
+#define BANNER                 "hwlat_detector: "
+#define DRVNAME                        "hwlat_detector"
+#define DEFAULT_SAMPLE_WINDOW  1000000                 /* 1s */
+#define DEFAULT_SAMPLE_WIDTH   500000                  /* 0.5s */
+#define DEFAULT_LAT_THRESHOLD  10                      /* 10us */
+
+/* Module metadata */
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jon Masters <jcm@redhat.com>");
+MODULE_DESCRIPTION("A simple hardware latency detector");
+MODULE_VERSION(VERSION);
+
+/* Module parameters */
+
+static int debug;
+static int enabled;
+static int threshold;
+
+module_param(debug, int, 0);                   /* enable debug */
+module_param(enabled, int, 0);                 /* enable detector */
+module_param(threshold, int, 0);               /* latency threshold */
+
+/* Buffering and sampling */
+
+static struct ring_buffer *ring_buffer;                /* sample buffer */
+static DEFINE_MUTEX(ring_buffer_mutex);                /* lock changes */
+static unsigned long buf_size = BUF_SIZE_DEFAULT;
+static struct task_struct *kthread;            /* sampling thread */
+
+/* DebugFS filesystem entries */
+
+static struct dentry *debug_dir;               /* debugfs directory */
+static struct dentry *debug_max;               /* maximum TSC delta */
+static struct dentry *debug_count;             /* total detect count */
+static struct dentry *debug_sample_width;      /* sample width us */
+static struct dentry *debug_sample_window;     /* sample window us */
+static struct dentry *debug_sample;            /* raw samples us */
+static struct dentry *debug_threshold;         /* threshold us */
+static struct dentry *debug_enable;            /* enable/disable */
+
+/* Individual samples and global state */
+
+struct sample;                                 /* latency sample */
+struct data;                                   /* Global state */
+
+/* Sampling functions */
+static int __buffer_add_sample(struct sample *sample);
+static struct sample *buffer_get_sample(struct sample *sample);
+
+/* Threading and state */
+static int kthread_fn(void *unused);
+static int start_kthread(void);
+static int stop_kthread(void);
+static void __reset_stats(void);
+static int init_stats(void);
+
+/* Debugfs interface */
+static ssize_t simple_data_read(struct file *filp, char __user *ubuf,
+                               size_t cnt, loff_t *ppos, const u64 *entry);
+static ssize_t simple_data_write(struct file *filp, const char __user *ubuf,
+                                size_t cnt, loff_t *ppos, u64 *entry);
+static int debug_sample_fopen(struct inode *inode, struct file *filp);
+static ssize_t debug_sample_fread(struct file *filp, char __user *ubuf,
+                                 size_t cnt, loff_t *ppos);
+static int debug_sample_release(struct inode *inode, struct file *filp);
+static int debug_enable_fopen(struct inode *inode, struct file *filp);
+static ssize_t debug_enable_fread(struct file *filp, char __user *ubuf,
+                                 size_t cnt, loff_t *ppos);
+static ssize_t debug_enable_fwrite(struct file *file,
+                                  const char __user *user_buffer,
+                                  size_t user_size, loff_t *offset);
+
+/* Initialization functions */
+static int init_debugfs(void);
+static void free_debugfs(void);
+static int detector_init(void);
+static void detector_exit(void);
+
+/* Individual latency samples are stored here when detected and packed into
+ * the ring_buffer circular buffer, where they are overwritten when
+ * more than buf_size/sizeof(sample) samples are received. */
+struct sample {
+       u64             seqnum;         /* unique sequence */
+       u64             duration;       /* ktime delta */
+       u64             outer_duration; /* ktime delta (outer loop) */
+       struct timespec timestamp;      /* wall time */
+       unsigned long   lost;
+};
+
+/* keep the global state somewhere. */
+static struct data {
+
+       struct mutex lock;              /* protect changes */
+
+       u64     count;                  /* total since reset */
+       u64     max_sample;             /* max hardware latency */
+       u64     threshold;              /* sample threshold level */
+
+       u64     sample_window;          /* total sampling window (on+off) */
+       u64     sample_width;           /* active sampling portion of window */
+
+       atomic_t sample_open;           /* whether the sample file is open */
+
+       wait_queue_head_t wq;           /* waitqeue for new sample values */
+
+} data;
+
+/**
+ * __buffer_add_sample - add a new latency sample recording to the ring buffer
+ * @sample: The new latency sample value
+ *
+ * This receives a new latency sample and records it in a global ring buffer.
+ * No additional locking is used in this case.
+ */
+static int __buffer_add_sample(struct sample *sample)
+{
+       return ring_buffer_write(ring_buffer,
+                                sizeof(struct sample), sample);
+}
+
+/**
+ * buffer_get_sample - remove a hardware latency sample from the ring buffer
+ * @sample: Pre-allocated storage for the sample
+ *
+ * This retrieves a hardware latency sample from the global circular buffer
+ */
+static struct sample *buffer_get_sample(struct sample *sample)
+{
+       struct ring_buffer_event *e = NULL;
+       struct sample *s = NULL;
+       unsigned int cpu = 0;
+
+       if (!sample)
+               return NULL;
+
+       mutex_lock(&ring_buffer_mutex);
+       for_each_online_cpu(cpu) {
+               e = ring_buffer_consume(ring_buffer, cpu, NULL, &sample->lost);
+               if (e)
+                       break;
+       }
+
+       if (e) {
+               s = ring_buffer_event_data(e);
+               memcpy(sample, s, sizeof(struct sample));
+       } else
+               sample = NULL;
+       mutex_unlock(&ring_buffer_mutex);
+
+       return sample;
+}
+
+#ifndef CONFIG_TRACING
+#define time_type      ktime_t
+#define time_get()     ktime_get()
+#define time_to_us(x)  ktime_to_us(x)
+#define time_sub(a, b) ktime_sub(a, b)
+#define init_time(a, b)        (a).tv64 = b
+#define time_u64(a)    ((a).tv64)
+#else
+#define time_type      u64
+#define time_get()     trace_clock_local()
+#define time_to_us(x)  div_u64(x, 1000)
+#define time_sub(a, b) ((a) - (b))
+#define init_time(a, b)        (a = b)
+#define time_u64(a)    a
+#endif
+/**
+ * get_sample - sample the CPU TSC and look for likely hardware latencies
+ *
+ * Used to repeatedly capture the CPU TSC (or similar), looking for potential
+ * hardware-induced latency. Called with interrupts disabled and with
+ * data.lock held.
+ */
+static int get_sample(void)
+{
+       time_type start, t1, t2, last_t2;
+       s64 diff, total = 0;
+       u64 sample = 0;
+       u64 outer_sample = 0;
+       int ret = -1;
+
+       init_time(last_t2, 0);
+       start = time_get(); /* start timestamp */
+
+       do {
+
+               t1 = time_get();        /* we'll look for a discontinuity */
+               t2 = time_get();
+
+               if (time_u64(last_t2)) {
+                       /* Check the delta from outer loop (t2 to next t1) */
+                       diff = time_to_us(time_sub(t1, last_t2));
+                       /* This shouldn't happen */
+                       if (diff < 0) {
+                               pr_err(BANNER "time running backwards\n");
+                               goto out;
+                       }
+                       if (diff > outer_sample)
+                               outer_sample = diff;
+               }
+               last_t2 = t2;
+
+               total = time_to_us(time_sub(t2, start)); /* sample width */
+
+               /* This checks the inner loop (t1 to t2) */
+               diff = time_to_us(time_sub(t2, t1));     /* current diff */
+
+               /* This shouldn't happen */
+               if (diff < 0) {
+                       pr_err(BANNER "time running backwards\n");
+                       goto out;
+               }
+
+               if (diff > sample)
+                       sample = diff; /* only want highest value */
+
+       } while (total <= data.sample_width);
+
+       ret = 0;
+
+       /* If we exceed the threshold value, we have found a hardware latency */
+       if (sample > data.threshold || outer_sample > data.threshold) {
+               struct sample s;
+
+               ret = 1;
+
+               data.count++;
+               s.seqnum = data.count;
+               s.duration = sample;
+               s.outer_duration = outer_sample;
+               s.timestamp = CURRENT_TIME;
+               __buffer_add_sample(&s);
+
+               /* Keep a running maximum ever recorded hardware latency */
+               if (sample > data.max_sample)
+                       data.max_sample = sample;
+       }
+
+out:
+       return ret;
+}
+
+/*
+ * kthread_fn - The CPU time sampling/hardware latency detection kernel thread
+ * @unused: A required part of the kthread API.
+ *
+ * Used to periodically sample the CPU TSC via a call to get_sample. We
+ * disable interrupts, which does (intentionally) introduce latency since we
+ * need to ensure nothing else might be running (and thus pre-empting).
+ * Obviously this should never be used in production environments.
+ *
+ * Currently this runs on which ever CPU it was scheduled on, but most
+ * real-worald hardware latency situations occur across several CPUs,
+ * but we might later generalize this if we find there are any actualy
+ * systems with alternate SMI delivery or other hardware latencies.
+ */
+static int kthread_fn(void *unused)
+{
+       int ret;
+       u64 interval;
+
+       while (!kthread_should_stop()) {
+
+               mutex_lock(&data.lock);
+
+               local_irq_disable();
+               ret = get_sample();
+               local_irq_enable();
+
+               if (ret > 0)
+                       wake_up(&data.wq); /* wake up reader(s) */
+
+               interval = data.sample_window - data.sample_width;
+               do_div(interval, USEC_PER_MSEC); /* modifies interval value */
+
+               mutex_unlock(&data.lock);
+
+               if (msleep_interruptible(interval))
+                       break;
+       }
+
+       return 0;
+}
+
+/**
+ * start_kthread - Kick off the hardware latency sampling/detector kthread
+ *
+ * This starts a kernel thread that will sit and sample the CPU timestamp
+ * counter (TSC or similar) and look for potential hardware latencies.
+ */
+static int start_kthread(void)
+{
+       kthread = kthread_run(kthread_fn, NULL,
+                                       DRVNAME);
+       if (IS_ERR(kthread)) {
+               pr_err(BANNER "could not start sampling thread\n");
+               enabled = 0;
+               return -ENOMEM;
+       }
+
+       return 0;
+}
+
+/**
+ * stop_kthread - Inform the hardware latency samping/detector kthread to stop
+ *
+ * This kicks the running hardware latency sampling/detector kernel thread and
+ * tells it to stop sampling now. Use this on unload and at system shutdown.
+ */
+static int stop_kthread(void)
+{
+       int ret;
+
+       ret = kthread_stop(kthread);
+
+       return ret;
+}
+
+/**
+ * __reset_stats - Reset statistics for the hardware latency detector
+ *
+ * We use data to store various statistics and global state. We call this
+ * function in order to reset those when "enable" is toggled on or off, and
+ * also at initialization. Should be called with data.lock held.
+ */
+static void __reset_stats(void)
+{
+       data.count = 0;
+       data.max_sample = 0;
+       ring_buffer_reset(ring_buffer); /* flush out old sample entries */
+}
+
+/**
+ * init_stats - Setup global state statistics for the hardware latency detector
+ *
+ * We use data to store various statistics and global state. We also use
+ * a global ring buffer (ring_buffer) to keep raw samples of detected hardware
+ * induced system latencies. This function initializes these structures and
+ * allocates the global ring buffer also.
+ */
+static int init_stats(void)
+{
+       int ret = -ENOMEM;
+
+       mutex_init(&data.lock);
+       init_waitqueue_head(&data.wq);
+       atomic_set(&data.sample_open, 0);
+
+       ring_buffer = ring_buffer_alloc(buf_size, BUF_FLAGS);
+
+       if (WARN(!ring_buffer, KERN_ERR BANNER
+                              "failed to allocate ring buffer!\n"))
+               goto out;
+
+       __reset_stats();
+       data.threshold = threshold ?: DEFAULT_LAT_THRESHOLD; /* threshold us */
+       data.sample_window = DEFAULT_SAMPLE_WINDOW; /* window us */
+       data.sample_width = DEFAULT_SAMPLE_WIDTH;   /* width us */
+
+       ret = 0;
+
+out:
+       return ret;
+
+}
+
+/*
+ * simple_data_read - Wrapper read function for global state debugfs entries
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The userspace provided buffer to read value into
+ * @cnt: The maximum number of bytes to read
+ * @ppos: The current "file" position
+ * @entry: The entry to read from
+ *
+ * This function provides a generic read implementation for the global state
+ * "data" structure debugfs filesystem entries. It would be nice to use
+ * simple_attr_read directly, but we need to make sure that the data.lock
+ * is held during the actual read.
+ */
+static ssize_t simple_data_read(struct file *filp, char __user *ubuf,
+                               size_t cnt, loff_t *ppos, const u64 *entry)
+{
+       char buf[U64STR_SIZE];
+       u64 val = 0;
+       int len = 0;
+
+       memset(buf, 0, sizeof(buf));
+
+       if (!entry)
+               return -EFAULT;
+
+       mutex_lock(&data.lock);
+       val = *entry;
+       mutex_unlock(&data.lock);
+
+       len = snprintf(buf, sizeof(buf), "%llu\n", (unsigned long long)val);
+
+       return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
+
+}
+
+/*
+ * simple_data_write - Wrapper write function for global state debugfs entries
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The userspace provided buffer to write value from
+ * @cnt: The maximum number of bytes to write
+ * @ppos: The current "file" position
+ * @entry: The entry to write to
+ *
+ * This function provides a generic write implementation for the global state
+ * "data" structure debugfs filesystem entries. It would be nice to use
+ * simple_attr_write directly, but we need to make sure that the data.lock
+ * is held during the actual write.
+ */
+static ssize_t simple_data_write(struct file *filp, const char __user *ubuf,
+                                size_t cnt, loff_t *ppos, u64 *entry)
+{
+       char buf[U64STR_SIZE];
+       int csize = min(cnt, sizeof(buf));
+       u64 val = 0;
+       int err = 0;
+
+       memset(buf, '\0', sizeof(buf));
+       if (copy_from_user(buf, ubuf, csize))
+               return -EFAULT;
+
+       buf[U64STR_SIZE-1] = '\0';                      /* just in case */
+       err = kstrtoull(buf, 10, &val);
+       if (err)
+               return -EINVAL;
+
+       mutex_lock(&data.lock);
+       *entry = val;
+       mutex_unlock(&data.lock);
+
+       return csize;
+}
+
+/**
+ * debug_count_fopen - Open function for "count" debugfs entry
+ * @inode: The in-kernel inode representation of the debugfs "file"
+ * @filp: The active open file structure for the debugfs "file"
+ *
+ * This function provides an open implementation for the "count" debugfs
+ * interface to the hardware latency detector.
+ */
+static int debug_count_fopen(struct inode *inode, struct file *filp)
+{
+       return 0;
+}
+
+/**
+ * debug_count_fread - Read function for "count" debugfs entry
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The userspace provided buffer to read value into
+ * @cnt: The maximum number of bytes to read
+ * @ppos: The current "file" position
+ *
+ * This function provides a read implementation for the "count" debugfs
+ * interface to the hardware latency detector. Can be used to read the
+ * number of latency readings exceeding the configured threshold since
+ * the detector was last reset (e.g. by writing a zero into "count").
+ */
+static ssize_t debug_count_fread(struct file *filp, char __user *ubuf,
+                                    size_t cnt, loff_t *ppos)
+{
+       return simple_data_read(filp, ubuf, cnt, ppos, &data.count);
+}
+
+/**
+ * debug_count_fwrite - Write function for "count" debugfs entry
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The user buffer that contains the value to write
+ * @cnt: The maximum number of bytes to write to "file"
+ * @ppos: The current position in the debugfs "file"
+ *
+ * This function provides a write implementation for the "count" debugfs
+ * interface to the hardware latency detector. Can be used to write a
+ * desired value, especially to zero the total count.
+ */
+static ssize_t  debug_count_fwrite(struct file *filp,
+                                      const char __user *ubuf,
+                                      size_t cnt,
+                                      loff_t *ppos)
+{
+       return simple_data_write(filp, ubuf, cnt, ppos, &data.count);
+}
+
+/**
+ * debug_enable_fopen - Dummy open function for "enable" debugfs interface
+ * @inode: The in-kernel inode representation of the debugfs "file"
+ * @filp: The active open file structure for the debugfs "file"
+ *
+ * This function provides an open implementation for the "enable" debugfs
+ * interface to the hardware latency detector.
+ */
+static int debug_enable_fopen(struct inode *inode, struct file *filp)
+{
+       return 0;
+}
+
+/**
+ * debug_enable_fread - Read function for "enable" debugfs interface
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The userspace provided buffer to read value into
+ * @cnt: The maximum number of bytes to read
+ * @ppos: The current "file" position
+ *
+ * This function provides a read implementation for the "enable" debugfs
+ * interface to the hardware latency detector. Can be used to determine
+ * whether the detector is currently enabled ("0\n" or "1\n" returned).
+ */
+static ssize_t debug_enable_fread(struct file *filp, char __user *ubuf,
+                                     size_t cnt, loff_t *ppos)
+{
+       char buf[4];
+
+       if ((cnt < sizeof(buf)) || (*ppos))
+               return 0;
+
+       buf[0] = enabled ? '1' : '0';
+       buf[1] = '\n';
+       buf[2] = '\0';
+       if (copy_to_user(ubuf, buf, strlen(buf)))
+               return -EFAULT;
+       return *ppos = strlen(buf);
+}
+
+/**
+ * debug_enable_fwrite - Write function for "enable" debugfs interface
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The user buffer that contains the value to write
+ * @cnt: The maximum number of bytes to write to "file"
+ * @ppos: The current position in the debugfs "file"
+ *
+ * This function provides a write implementation for the "enable" debugfs
+ * interface to the hardware latency detector. Can be used to enable or
+ * disable the detector, which will have the side-effect of possibly
+ * also resetting the global stats and kicking off the measuring
+ * kthread (on an enable) or the converse (upon a disable).
+ */
+static ssize_t  debug_enable_fwrite(struct file *filp,
+                                       const char __user *ubuf,
+                                       size_t cnt,
+                                       loff_t *ppos)
+{
+       char buf[4];
+       int csize = min(cnt, sizeof(buf));
+       long val = 0;
+       int err = 0;
+
+       memset(buf, '\0', sizeof(buf));
+       if (copy_from_user(buf, ubuf, csize))
+               return -EFAULT;
+
+       buf[sizeof(buf)-1] = '\0';                      /* just in case */
+       err = kstrtoul(buf, 10, &val);
+       if (err)
+               return -EINVAL;
+
+       if (val) {
+               if (enabled)
+                       goto unlock;
+               enabled = 1;
+               __reset_stats();
+               if (start_kthread())
+                       return -EFAULT;
+       } else {
+               if (!enabled)
+                       goto unlock;
+               enabled = 0;
+               err = stop_kthread();
+               if (err) {
+                       pr_err(BANNER "cannot stop kthread\n");
+                       return -EFAULT;
+               }
+               wake_up(&data.wq);              /* reader(s) should return */
+       }
+unlock:
+       return csize;
+}
+
+/**
+ * debug_max_fopen - Open function for "max" debugfs entry
+ * @inode: The in-kernel inode representation of the debugfs "file"
+ * @filp: The active open file structure for the debugfs "file"
+ *
+ * This function provides an open implementation for the "max" debugfs
+ * interface to the hardware latency detector.
+ */
+static int debug_max_fopen(struct inode *inode, struct file *filp)
+{
+       return 0;
+}
+
+/**
+ * debug_max_fread - Read function for "max" debugfs entry
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The userspace provided buffer to read value into
+ * @cnt: The maximum number of bytes to read
+ * @ppos: The current "file" position
+ *
+ * This function provides a read implementation for the "max" debugfs
+ * interface to the hardware latency detector. Can be used to determine
+ * the maximum latency value observed since it was last reset.
+ */
+static ssize_t debug_max_fread(struct file *filp, char __user *ubuf,
+                                  size_t cnt, loff_t *ppos)
+{
+       return simple_data_read(filp, ubuf, cnt, ppos, &data.max_sample);
+}
+
+/**
+ * debug_max_fwrite - Write function for "max" debugfs entry
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The user buffer that contains the value to write
+ * @cnt: The maximum number of bytes to write to "file"
+ * @ppos: The current position in the debugfs "file"
+ *
+ * This function provides a write implementation for the "max" debugfs
+ * interface to the hardware latency detector. Can be used to reset the
+ * maximum or set it to some other desired value - if, then, subsequent
+ * measurements exceed this value, the maximum will be updated.
+ */
+static ssize_t  debug_max_fwrite(struct file *filp,
+                                    const char __user *ubuf,
+                                    size_t cnt,
+                                    loff_t *ppos)
+{
+       return simple_data_write(filp, ubuf, cnt, ppos, &data.max_sample);
+}
+
+
+/**
+ * debug_sample_fopen - An open function for "sample" debugfs interface
+ * @inode: The in-kernel inode representation of this debugfs "file"
+ * @filp: The active open file structure for the debugfs "file"
+ *
+ * This function handles opening the "sample" file within the hardware
+ * latency detector debugfs directory interface. This file is used to read
+ * raw samples from the global ring_buffer and allows the user to see a
+ * running latency history. Can be opened blocking or non-blocking,
+ * affecting whether it behaves as a buffer read pipe, or does not.
+ * Implements simple locking to prevent multiple simultaneous use.
+ */
+static int debug_sample_fopen(struct inode *inode, struct file *filp)
+{
+       if (!atomic_add_unless(&data.sample_open, 1, 1))
+               return -EBUSY;
+       else
+               return 0;
+}
+
+/**
+ * debug_sample_fread - A read function for "sample" debugfs interface
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The user buffer that will contain the samples read
+ * @cnt: The maximum bytes to read from the debugfs "file"
+ * @ppos: The current position in the debugfs "file"
+ *
+ * This function handles reading from the "sample" file within the hardware
+ * latency detector debugfs directory interface. This file is used to read
+ * raw samples from the global ring_buffer and allows the user to see a
+ * running latency history. By default this will block pending a new
+ * value written into the sample buffer, unless there are already a
+ * number of value(s) waiting in the buffer, or the sample file was
+ * previously opened in a non-blocking mode of operation.
+ */
+static ssize_t debug_sample_fread(struct file *filp, char __user *ubuf,
+                                       size_t cnt, loff_t *ppos)
+{
+       int len = 0;
+       char buf[64];
+       struct sample *sample = NULL;
+
+       if (!enabled)
+               return 0;
+
+       sample = kzalloc(sizeof(struct sample), GFP_KERNEL);
+       if (!sample)
+               return -ENOMEM;
+
+       while (!buffer_get_sample(sample)) {
+
+               DEFINE_WAIT(wait);
+
+               if (filp->f_flags & O_NONBLOCK) {
+                       len = -EAGAIN;
+                       goto out;
+               }
+
+               prepare_to_wait(&data.wq, &wait, TASK_INTERRUPTIBLE);
+               schedule();
+               finish_wait(&data.wq, &wait);
+
+               if (signal_pending(current)) {
+                       len = -EINTR;
+                       goto out;
+               }
+
+               if (!enabled) {                 /* enable was toggled */
+                       len = 0;
+                       goto out;
+               }
+       }
+
+       len = snprintf(buf, sizeof(buf), "%010lu.%010lu\t%llu\t%llu\n",
+                      sample->timestamp.tv_sec,
+                      sample->timestamp.tv_nsec,
+                      sample->duration,
+                      sample->outer_duration);
+
+
+       /* handling partial reads is more trouble than it's worth */
+       if (len > cnt)
+               goto out;
+
+       if (copy_to_user(ubuf, buf, len))
+               len = -EFAULT;
+
+out:
+       kfree(sample);
+       return len;
+}
+
+/**
+ * debug_sample_release - Release function for "sample" debugfs interface
+ * @inode: The in-kernel inode represenation of the debugfs "file"
+ * @filp: The active open file structure for the debugfs "file"
+ *
+ * This function completes the close of the debugfs interface "sample" file.
+ * Frees the sample_open "lock" so that other users may open the interface.
+ */
+static int debug_sample_release(struct inode *inode, struct file *filp)
+{
+       atomic_dec(&data.sample_open);
+
+       return 0;
+}
+
+/**
+ * debug_threshold_fopen - Open function for "threshold" debugfs entry
+ * @inode: The in-kernel inode representation of the debugfs "file"
+ * @filp: The active open file structure for the debugfs "file"
+ *
+ * This function provides an open implementation for the "threshold" debugfs
+ * interface to the hardware latency detector.
+ */
+static int debug_threshold_fopen(struct inode *inode, struct file *filp)
+{
+       return 0;
+}
+
+/**
+ * debug_threshold_fread - Read function for "threshold" debugfs entry
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The userspace provided buffer to read value into
+ * @cnt: The maximum number of bytes to read
+ * @ppos: The current "file" position
+ *
+ * This function provides a read implementation for the "threshold" debugfs
+ * interface to the hardware latency detector. It can be used to determine
+ * the current threshold level at which a latency will be recorded in the
+ * global ring buffer, typically on the order of 10us.
+ */
+static ssize_t debug_threshold_fread(struct file *filp, char __user *ubuf,
+                                        size_t cnt, loff_t *ppos)
+{
+       return simple_data_read(filp, ubuf, cnt, ppos, &data.threshold);
+}
+
+/**
+ * debug_threshold_fwrite - Write function for "threshold" debugfs entry
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The user buffer that contains the value to write
+ * @cnt: The maximum number of bytes to write to "file"
+ * @ppos: The current position in the debugfs "file"
+ *
+ * This function provides a write implementation for the "threshold" debugfs
+ * interface to the hardware latency detector. It can be used to configure
+ * the threshold level at which any subsequently detected latencies will
+ * be recorded into the global ring buffer.
+ */
+static ssize_t  debug_threshold_fwrite(struct file *filp,
+                                       const char __user *ubuf,
+                                       size_t cnt,
+                                       loff_t *ppos)
+{
+       int ret;
+
+       ret = simple_data_write(filp, ubuf, cnt, ppos, &data.threshold);
+
+       if (enabled)
+               wake_up_process(kthread);
+
+       return ret;
+}
+
+/**
+ * debug_width_fopen - Open function for "width" debugfs entry
+ * @inode: The in-kernel inode representation of the debugfs "file"
+ * @filp: The active open file structure for the debugfs "file"
+ *
+ * This function provides an open implementation for the "width" debugfs
+ * interface to the hardware latency detector.
+ */
+static int debug_width_fopen(struct inode *inode, struct file *filp)
+{
+       return 0;
+}
+
+/**
+ * debug_width_fread - Read function for "width" debugfs entry
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The userspace provided buffer to read value into
+ * @cnt: The maximum number of bytes to read
+ * @ppos: The current "file" position
+ *
+ * This function provides a read implementation for the "width" debugfs
+ * interface to the hardware latency detector. It can be used to determine
+ * for how many us of the total window us we will actively sample for any
+ * hardware-induced latecy periods. Obviously, it is not possible to
+ * sample constantly and have the system respond to a sample reader, or,
+ * worse, without having the system appear to have gone out to lunch.
+ */
+static ssize_t debug_width_fread(struct file *filp, char __user *ubuf,
+                                    size_t cnt, loff_t *ppos)
+{
+       return simple_data_read(filp, ubuf, cnt, ppos, &data.sample_width);
+}
+
+/**
+ * debug_width_fwrite - Write function for "width" debugfs entry
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The user buffer that contains the value to write
+ * @cnt: The maximum number of bytes to write to "file"
+ * @ppos: The current position in the debugfs "file"
+ *
+ * This function provides a write implementation for the "width" debugfs
+ * interface to the hardware latency detector. It can be used to configure
+ * for how many us of the total window us we will actively sample for any
+ * hardware-induced latency periods. Obviously, it is not possible to
+ * sample constantly and have the system respond to a sample reader, or,
+ * worse, without having the system appear to have gone out to lunch. It
+ * is enforced that width is less that the total window size.
+ */
+static ssize_t  debug_width_fwrite(struct file *filp,
+                                      const char __user *ubuf,
+                                      size_t cnt,
+                                      loff_t *ppos)
+{
+       char buf[U64STR_SIZE];
+       int csize = min(cnt, sizeof(buf));
+       u64 val = 0;
+       int err = 0;
+
+       memset(buf, '\0', sizeof(buf));
+       if (copy_from_user(buf, ubuf, csize))
+               return -EFAULT;
+
+       buf[U64STR_SIZE-1] = '\0';                      /* just in case */
+       err = kstrtoull(buf, 10, &val);
+       if (err)
+               return -EINVAL;
+
+       mutex_lock(&data.lock);
+       if (val < data.sample_window)
+               data.sample_width = val;
+       else {
+               mutex_unlock(&data.lock);
+               return -EINVAL;
+       }
+       mutex_unlock(&data.lock);
+
+       if (enabled)
+               wake_up_process(kthread);
+
+       return csize;
+}
+
+/**
+ * debug_window_fopen - Open function for "window" debugfs entry
+ * @inode: The in-kernel inode representation of the debugfs "file"
+ * @filp: The active open file structure for the debugfs "file"
+ *
+ * This function provides an open implementation for the "window" debugfs
+ * interface to the hardware latency detector. The window is the total time
+ * in us that will be considered one sample period. Conceptually, windows
+ * occur back-to-back and contain a sample width period during which
+ * actual sampling occurs.
+ */
+static int debug_window_fopen(struct inode *inode, struct file *filp)
+{
+       return 0;
+}
+
+/**
+ * debug_window_fread - Read function for "window" debugfs entry
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The userspace provided buffer to read value into
+ * @cnt: The maximum number of bytes to read
+ * @ppos: The current "file" position
+ *
+ * This function provides a read implementation for the "window" debugfs
+ * interface to the hardware latency detector. The window is the total time
+ * in us that will be considered one sample period. Conceptually, windows
+ * occur back-to-back and contain a sample width period during which
+ * actual sampling occurs. Can be used to read the total window size.
+ */
+static ssize_t debug_window_fread(struct file *filp, char __user *ubuf,
+                                     size_t cnt, loff_t *ppos)
+{
+       return simple_data_read(filp, ubuf, cnt, ppos, &data.sample_window);
+}
+
+/**
+ * debug_window_fwrite - Write function for "window" debugfs entry
+ * @filp: The active open file structure for the debugfs "file"
+ * @ubuf: The user buffer that contains the value to write
+ * @cnt: The maximum number of bytes to write to "file"
+ * @ppos: The current position in the debugfs "file"
+ *
+ * This function provides a write implementation for the "window" debufds
+ * interface to the hardware latency detetector. The window is the total time
+ * in us that will be considered one sample period. Conceptually, windows
+ * occur back-to-back and contain a sample width period during which
+ * actual sampling occurs. Can be used to write a new total window size. It
+ * is enfoced that any value written must be greater than the sample width
+ * size, or an error results.
+ */
+static ssize_t  debug_window_fwrite(struct file *filp,
+                                       const char __user *ubuf,
+                                       size_t cnt,
+                                       loff_t *ppos)
+{
+       char buf[U64STR_SIZE];
+       int csize = min(cnt, sizeof(buf));
+       u64 val = 0;
+       int err = 0;
+
+       memset(buf, '\0', sizeof(buf));
+       if (copy_from_user(buf, ubuf, csize))
+               return -EFAULT;
+
+       buf[U64STR_SIZE-1] = '\0';                      /* just in case */
+       err = kstrtoull(buf, 10, &val);
+       if (err)
+               return -EINVAL;
+
+       mutex_lock(&data.lock);
+       if (data.sample_width < val)
+               data.sample_window = val;
+       else {
+               mutex_unlock(&data.lock);
+               return -EINVAL;
+       }
+       mutex_unlock(&data.lock);
+
+       return csize;
+}
+
+/*
+ * Function pointers for the "count" debugfs file operations
+ */
+static const struct file_operations count_fops = {
+       .open           = debug_count_fopen,
+       .read           = debug_count_fread,
+       .write          = debug_count_fwrite,
+       .owner          = THIS_MODULE,
+};
+
+/*
+ * Function pointers for the "enable" debugfs file operations
+ */
+static const struct file_operations enable_fops = {
+       .open           = debug_enable_fopen,
+       .read           = debug_enable_fread,
+       .write          = debug_enable_fwrite,
+       .owner          = THIS_MODULE,
+};
+
+/*
+ * Function pointers for the "max" debugfs file operations
+ */
+static const struct file_operations max_fops = {
+       .open           = debug_max_fopen,
+       .read           = debug_max_fread,
+       .write          = debug_max_fwrite,
+       .owner          = THIS_MODULE,
+};
+
+/*
+ * Function pointers for the "sample" debugfs file operations
+ */
+static const struct file_operations sample_fops = {
+       .open           = debug_sample_fopen,
+       .read           = debug_sample_fread,
+       .release        = debug_sample_release,
+       .owner          = THIS_MODULE,
+};
+
+/*
+ * Function pointers for the "threshold" debugfs file operations
+ */
+static const struct file_operations threshold_fops = {
+       .open           = debug_threshold_fopen,
+       .read           = debug_threshold_fread,
+       .write          = debug_threshold_fwrite,
+       .owner          = THIS_MODULE,
+};
+
+/*
+ * Function pointers for the "width" debugfs file operations
+ */
+static const struct file_operations width_fops = {
+       .open           = debug_width_fopen,
+       .read           = debug_width_fread,
+       .write          = debug_width_fwrite,
+       .owner          = THIS_MODULE,
+};
+
+/*
+ * Function pointers for the "window" debugfs file operations
+ */
+static const struct file_operations window_fops = {
+       .open           = debug_window_fopen,
+       .read           = debug_window_fread,
+       .write          = debug_window_fwrite,
+       .owner          = THIS_MODULE,
+};
+
+/**
+ * init_debugfs - A function to initialize the debugfs interface files
+ *
+ * This function creates entries in debugfs for "hwlat_detector", including
+ * files to read values from the detector, current samples, and the
+ * maximum sample that has been captured since the hardware latency
+ * dectector was started.
+ */
+static int init_debugfs(void)
+{
+       int ret = -ENOMEM;
+
+       debug_dir = debugfs_create_dir(DRVNAME, NULL);
+       if (!debug_dir)
+               goto err_debug_dir;
+
+       debug_sample = debugfs_create_file("sample", 0444,
+                                              debug_dir, NULL,
+                                              &sample_fops);
+       if (!debug_sample)
+               goto err_sample;
+
+       debug_count = debugfs_create_file("count", 0444,
+                                             debug_dir, NULL,
+                                             &count_fops);
+       if (!debug_count)
+               goto err_count;
+
+       debug_max = debugfs_create_file("max", 0444,
+                                           debug_dir, NULL,
+                                           &max_fops);
+       if (!debug_max)
+               goto err_max;
+
+       debug_sample_window = debugfs_create_file("window", 0644,
+                                                     debug_dir, NULL,
+                                                     &window_fops);
+       if (!debug_sample_window)
+               goto err_window;
+
+       debug_sample_width = debugfs_create_file("width", 0644,
+                                                    debug_dir, NULL,
+                                                    &width_fops);
+       if (!debug_sample_width)
+               goto err_width;
+
+       debug_threshold = debugfs_create_file("threshold", 0644,
+                                                 debug_dir, NULL,
+                                                 &threshold_fops);
+       if (!debug_threshold)
+               goto err_threshold;
+
+       debug_enable = debugfs_create_file("enable", 0644,
+                                              debug_dir, &enabled,
+                                              &enable_fops);
+       if (!debug_enable)
+               goto err_enable;
+
+       else {
+               ret = 0;
+               goto out;
+       }
+
+err_enable:
+       debugfs_remove(debug_threshold);
+err_threshold:
+       debugfs_remove(debug_sample_width);
+err_width:
+       debugfs_remove(debug_sample_window);
+err_window:
+       debugfs_remove(debug_max);
+err_max:
+       debugfs_remove(debug_count);
+err_count:
+       debugfs_remove(debug_sample);
+err_sample:
+       debugfs_remove(debug_dir);
+err_debug_dir:
+out:
+       return ret;
+}
+
+/**
+ * free_debugfs - A function to cleanup the debugfs file interface
+ */
+static void free_debugfs(void)
+{
+       /* could also use a debugfs_remove_recursive */
+       debugfs_remove(debug_enable);
+       debugfs_remove(debug_threshold);
+       debugfs_remove(debug_sample_width);
+       debugfs_remove(debug_sample_window);
+       debugfs_remove(debug_max);
+       debugfs_remove(debug_count);
+       debugfs_remove(debug_sample);
+       debugfs_remove(debug_dir);
+}
+
+/**
+ * detector_init - Standard module initialization code
+ */
+static int detector_init(void)
+{
+       int ret = -ENOMEM;
+
+       pr_info(BANNER "version %s\n", VERSION);
+
+       ret = init_stats();
+       if (ret)
+               goto out;
+
+       ret = init_debugfs();
+       if (ret)
+               goto err_stats;
+
+       if (enabled)
+               ret = start_kthread();
+
+       goto out;
+
+err_stats:
+       ring_buffer_free(ring_buffer);
+out:
+       return ret;
+
+}
+
+/**
+ * detector_exit - Standard module cleanup code
+ */
+static void detector_exit(void)
+{
+       int err;
+
+       if (enabled) {
+               enabled = 0;
+               err = stop_kthread();
+               if (err)
+                       pr_err(BANNER "cannot stop kthread\n");
+       }
+
+       free_debugfs();
+       ring_buffer_free(ring_buffer);  /* free up the ring buffer */
+
+}
+
+module_init(detector_init);
+module_exit(detector_exit);
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index acece3299756..58ea04a03fa9 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1155,15 +1155,12 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
        struct sg_mapping_iter *sg_miter = &host->sg_miter;
        struct variant_data *variant = host->variant;
        void __iomem *base = host->base;
-       unsigned long flags;
        u32 status;
 
        status = readl(base + MMCISTATUS);
 
        dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status);
 
-       local_irq_save(flags);
-
        do {
                unsigned int remain, len;
                char *buffer;
@@ -1203,8 +1200,6 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
 
        sg_miter_stop(sg_miter);
 
-       local_irq_restore(flags);
-
        /*
         * If we have less than the fifo 'half-full' threshold to transfer,
         * trigger a PIO interrupt as soon as any data is available.
diff --git a/drivers/net/ethernet/3com/3c59x.c b/drivers/net/ethernet/3com/3c59x.c
index 2839af00f20c..4348b9c850d3 100644
--- a/drivers/net/ethernet/3com/3c59x.c
+++ b/drivers/net/ethernet/3com/3c59x.c
@@ -842,9 +842,9 @@ static void poll_vortex(struct net_device *dev)
 {
        struct vortex_private *vp = netdev_priv(dev);
        unsigned long flags;
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
        (vp->full_bus_master_rx ? boomerang_interrupt:vortex_interrupt)(dev->irq,dev);
-       local_irq_restore(flags);
+       local_irq_restore_nort(flags);
 }
 #endif
 
@@ -1916,12 +1916,12 @@ static void vortex_tx_timeout(struct net_device *dev)
                         * Block interrupts because vortex_interrupt does a bare spin_lock()
                         */
                        unsigned long flags;
-                       local_irq_save(flags);
+                       local_irq_save_nort(flags);
                        if (vp->full_bus_master_tx)
                                boomerang_interrupt(dev->irq, dev);
                        else
                                vortex_interrupt(dev->irq, dev);
-                       local_irq_restore(flags);
+                       local_irq_restore_nort(flags);
                }
        }
 
diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
index 8b5988e210d5..cf9928ccdd7e 100644
--- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
+++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
@@ -2221,11 +2221,7 @@ static netdev_tx_t atl1c_xmit_frame(struct sk_buff *skb,
        }
 
        tpd_req = atl1c_cal_tpd_req(skb);
-       if (!spin_trylock_irqsave(&adapter->tx_lock, flags)) {
-               if (netif_msg_pktdata(adapter))
-                       dev_info(&adapter->pdev->dev, "tx locked\n");
-               return NETDEV_TX_LOCKED;
-       }
+       spin_lock_irqsave(&adapter->tx_lock, flags);
 
        if (atl1c_tpd_avail(adapter, type) < tpd_req) {
                /* no enough descriptor, just stop queue */
diff --git a/drivers/net/ethernet/atheros/atl1e/atl1e_main.c b/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
index 59a03a193e83..734f7a7ad2c3 100644
--- a/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
+++ b/drivers/net/ethernet/atheros/atl1e/atl1e_main.c
@@ -1880,8 +1880,7 @@ static netdev_tx_t atl1e_xmit_frame(struct sk_buff *skb,
                return NETDEV_TX_OK;
        }
        tpd_req = atl1e_cal_tdp_req(skb);
-       if (!spin_trylock_irqsave(&adapter->tx_lock, flags))
-               return NETDEV_TX_LOCKED;
+       spin_lock_irqsave(&adapter->tx_lock, flags);
 
        if (atl1e_tpd_avail(adapter) < tpd_req) {
                /* no enough descriptor, just stop queue */
diff --git a/drivers/net/ethernet/chelsio/cxgb/sge.c b/drivers/net/ethernet/chelsio/cxgb/sge.c
index 526ea74e82d9..86f467a2c485 100644
--- a/drivers/net/ethernet/chelsio/cxgb/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb/sge.c
@@ -1664,8 +1664,7 @@ static int t1_sge_tx(struct sk_buff *skb, struct adapter *adapter,
        struct cmdQ *q = &sge->cmdQ[qid];
        unsigned int credits, pidx, genbit, count, use_sched_skb = 0;
 
-       if (!spin_trylock(&q->lock))
-               return NETDEV_TX_LOCKED;
+       spin_lock(&q->lock);
 
        reclaim_completed_tx(sge, q);
 
diff --git a/drivers/net/ethernet/neterion/s2io.c b/drivers/net/ethernet/neterion/s2io.c
index 9ba975853ec6..813cfa698160 100644
--- a/drivers/net/ethernet/neterion/s2io.c
+++ b/drivers/net/ethernet/neterion/s2io.c
@@ -4084,12 +4084,7 @@ static netdev_tx_t s2io_xmit(struct sk_buff *skb, struct net_device *dev)
                        [skb->priority & (MAX_TX_FIFOS - 1)];
        fifo = &mac_control->fifos[queue];
 
-       if (do_spin_lock)
-               spin_lock_irqsave(&fifo->tx_lock, flags);
-       else {
-               if (unlikely(!spin_trylock_irqsave(&fifo->tx_lock, flags)))
-                       return NETDEV_TX_LOCKED;
-       }
+       spin_lock_irqsave(&fifo->tx_lock, flags);
 
        if (sp->config.multiq) {
                if (__netif_subqueue_stopped(dev, fifo->fifo_no)) {
diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
index 3b98b263bad0..ca4add749410 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
@@ -2137,10 +2137,8 @@ static int pch_gbe_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
        struct pch_gbe_tx_ring *tx_ring = adapter->tx_ring;
        unsigned long flags;
 
-       if (!spin_trylock_irqsave(&tx_ring->tx_lock, flags)) {
-               /* Collision - tell upper layer to requeue */
-               return NETDEV_TX_LOCKED;
-       }
+       spin_lock_irqsave(&tx_ring->tx_lock, flags);
+
        if (unlikely(!PCH_GBE_DESC_UNUSED(tx_ring))) {
                netif_stop_queue(netdev);
                spin_unlock_irqrestore(&tx_ring->tx_lock, flags);
diff --git a/drivers/net/ethernet/realtek/8139too.c b/drivers/net/ethernet/realtek/8139too.c
index ef668d300800..d987d571fdd6 100644
--- a/drivers/net/ethernet/realtek/8139too.c
+++ b/drivers/net/ethernet/realtek/8139too.c
@@ -2229,7 +2229,7 @@ static void rtl8139_poll_controller(struct net_device *dev)
        struct rtl8139_private *tp = netdev_priv(dev);
        const int irq = tp->pci_dev->irq;
 
-       disable_irq(irq);
+       disable_irq_nosync(irq);
        rtl8139_interrupt(irq, dev);
        enable_irq(irq);
 }
diff --git a/drivers/net/ethernet/tehuti/tehuti.c b/drivers/net/ethernet/tehuti/tehuti.c
index 14c9d1baa85c..e1a5305418a8 100644
--- a/drivers/net/ethernet/tehuti/tehuti.c
+++ b/drivers/net/ethernet/tehuti/tehuti.c
@@ -1629,13 +1629,8 @@ static netdev_tx_t bdx_tx_transmit(struct sk_buff *skb,
        unsigned long flags;
 
        ENTER;
-       local_irq_save(flags);
-       if (!spin_trylock(&priv->tx_lock)) {
-               local_irq_restore(flags);
-               DBG("%s[%s]: TX locked, returning NETDEV_TX_LOCKED\n",
-                   BDX_DRV_NAME, ndev->name);
-               return NETDEV_TX_LOCKED;
-       }
+
+       spin_lock_irqsave(&priv->tx_lock, flags);
 
        /* build tx descriptor */
        BDX_ASSERT(f->m.wptr >= f->m.memsz);    /* started with valid wptr */
diff --git a/drivers/net/rionet.c b/drivers/net/rionet.c
index e7034c55e796..2e4ee0f912bf 100644
--- a/drivers/net/rionet.c
+++ b/drivers/net/rionet.c
@@ -174,11 +174,7 @@ static int rionet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
        unsigned long flags;
        int add_num = 1;
 
-       local_irq_save(flags);
-       if (!spin_trylock(&rnet->tx_lock)) {
-               local_irq_restore(flags);
-               return NETDEV_TX_LOCKED;
-       }
+       spin_lock_irqsave(&rnet->tx_lock, flags);
 
        if (is_multicast_ether_addr(eth->h_dest))
                add_num = nets[rnet->mport->id].nact;
diff --git a/drivers/net/wireless/orinoco/orinoco_usb.c b/drivers/net/wireless/orinoco/orinoco_usb.c
index f2cd513d54b2..6c0f4c9638a2 100644
--- a/drivers/net/wireless/orinoco/orinoco_usb.c
+++ b/drivers/net/wireless/orinoco/orinoco_usb.c
@@ -697,7 +697,7 @@ static void ezusb_req_ctx_wait(struct ezusb_priv *upriv,
                        while (!ctx->done.done && msecs--)
                                udelay(1000);
                } else {
-                       wait_event_interruptible(ctx->done.wait,
+                       swait_event_interruptible(ctx->done.wait,
                                                 ctx->done.done);
                }
                break;
diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 59ac36fe7c42..7a45a20af78a 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -561,7 +561,7 @@ void pci_cfg_access_unlock(struct pci_dev *dev)
        WARN_ON(!dev->block_cfg_access);
 
        dev->block_cfg_access = 0;
-       wake_up_all(&pci_cfg_wait);
+       wake_up_all_locked(&pci_cfg_wait);
        raw_spin_unlock_irqrestore(&pci_lock, flags);
 }
 EXPORT_SYMBOL_GPL(pci_cfg_access_unlock);
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index 9736f9be5447..5fe9b173dcb3 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -60,7 +60,7 @@ struct msm_pinctrl {
        struct notifier_block restart_nb;
        int irq;
 
-       spinlock_t lock;
+       raw_spinlock_t lock;
 
        DECLARE_BITMAP(dual_edge_irqs, MAX_NR_GPIO);
        DECLARE_BITMAP(enabled_irqs, MAX_NR_GPIO);
@@ -156,14 +156,14 @@ static int msm_pinmux_set_mux(struct pinctrl_dev *pctldev,
        if (WARN_ON(i == g->nfuncs))
                return -EINVAL;
 
-       spin_lock_irqsave(&pctrl->lock, flags);
+       raw_spin_lock_irqsave(&pctrl->lock, flags);
 
        val = readl(pctrl->regs + g->ctl_reg);
        val &= ~(0x7 << g->mux_bit);
        val |= i << g->mux_bit;
        writel(val, pctrl->regs + g->ctl_reg);
 
-       spin_unlock_irqrestore(&pctrl->lock, flags);
+       raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 
        return 0;
 }
@@ -326,14 +326,14 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
                        break;
                case PIN_CONFIG_OUTPUT:
                        /* set output value */
-                       spin_lock_irqsave(&pctrl->lock, flags);
+                       raw_spin_lock_irqsave(&pctrl->lock, flags);
                        val = readl(pctrl->regs + g->io_reg);
                        if (arg)
                                val |= BIT(g->out_bit);
                        else
                                val &= ~BIT(g->out_bit);
                        writel(val, pctrl->regs + g->io_reg);
-                       spin_unlock_irqrestore(&pctrl->lock, flags);
+                       raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 
                        /* enable output */
                        arg = 1;
@@ -354,12 +354,12 @@ static int msm_config_group_set(struct pinctrl_dev *pctldev,
                        return -EINVAL;
                }
 
-               spin_lock_irqsave(&pctrl->lock, flags);
+               raw_spin_lock_irqsave(&pctrl->lock, flags);
                val = readl(pctrl->regs + g->ctl_reg);
                val &= ~(mask << bit);
                val |= arg << bit;
                writel(val, pctrl->regs + g->ctl_reg);
-               spin_unlock_irqrestore(&pctrl->lock, flags);
+               raw_spin_unlock_irqrestore(&pctrl->lock, flags);
        }
 
        return 0;
@@ -387,13 +387,13 @@ static int msm_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 
        g = &pctrl->soc->groups[offset];
 
-       spin_lock_irqsave(&pctrl->lock, flags);
+       raw_spin_lock_irqsave(&pctrl->lock, flags);
 
        val = readl(pctrl->regs + g->ctl_reg);
        val &= ~BIT(g->oe_bit);
        writel(val, pctrl->regs + g->ctl_reg);
 
-       spin_unlock_irqrestore(&pctrl->lock, flags);
+       raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 
        return 0;
 }
@@ -407,7 +407,7 @@ static int msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, in
 
        g = &pctrl->soc->groups[offset];
 
-       spin_lock_irqsave(&pctrl->lock, flags);
+       raw_spin_lock_irqsave(&pctrl->lock, flags);
 
        val = readl(pctrl->regs + g->io_reg);
        if (value)
@@ -420,7 +420,7 @@ static int msm_gpio_direction_output(struct gpio_chip *chip, unsigned offset, in
        val |= BIT(g->oe_bit);
        writel(val, pctrl->regs + g->ctl_reg);
 
-       spin_unlock_irqrestore(&pctrl->lock, flags);
+       raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 
        return 0;
 }
@@ -446,7 +446,7 @@ static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 
        g = &pctrl->soc->groups[offset];
 
-       spin_lock_irqsave(&pctrl->lock, flags);
+       raw_spin_lock_irqsave(&pctrl->lock, flags);
 
        val = readl(pctrl->regs + g->io_reg);
        if (value)
@@ -455,7 +455,7 @@ static void msm_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
                val &= ~BIT(g->out_bit);
        writel(val, pctrl->regs + g->io_reg);
 
-       spin_unlock_irqrestore(&pctrl->lock, flags);
+       raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 }
 
 #ifdef CONFIG_DEBUG_FS
@@ -574,7 +574,7 @@ static void msm_gpio_irq_mask(struct irq_data *d)
 
        g = &pctrl->soc->groups[d->hwirq];
 
-       spin_lock_irqsave(&pctrl->lock, flags);
+       raw_spin_lock_irqsave(&pctrl->lock, flags);
 
        val = readl(pctrl->regs + g->intr_cfg_reg);
        val &= ~BIT(g->intr_enable_bit);
@@ -582,7 +582,7 @@ static void msm_gpio_irq_mask(struct irq_data *d)
 
        clear_bit(d->hwirq, pctrl->enabled_irqs);
 
-       spin_unlock_irqrestore(&pctrl->lock, flags);
+       raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 }
 
 static void msm_gpio_irq_unmask(struct irq_data *d)
@@ -595,7 +595,7 @@ static void msm_gpio_irq_unmask(struct irq_data *d)
 
        g = &pctrl->soc->groups[d->hwirq];
 
-       spin_lock_irqsave(&pctrl->lock, flags);
+       raw_spin_lock_irqsave(&pctrl->lock, flags);
 
        val = readl(pctrl->regs + g->intr_cfg_reg);
        val |= BIT(g->intr_enable_bit);
@@ -603,7 +603,7 @@ static void msm_gpio_irq_unmask(struct irq_data *d)
 
        set_bit(d->hwirq, pctrl->enabled_irqs);
 
-       spin_unlock_irqrestore(&pctrl->lock, flags);
+       raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 }
 
 static void msm_gpio_irq_ack(struct irq_data *d)
@@ -616,7 +616,7 @@ static void msm_gpio_irq_ack(struct irq_data *d)
 
        g = &pctrl->soc->groups[d->hwirq];
 
-       spin_lock_irqsave(&pctrl->lock, flags);
+       raw_spin_lock_irqsave(&pctrl->lock, flags);
 
        val = readl(pctrl->regs + g->intr_status_reg);
        if (g->intr_ack_high)
@@ -628,7 +628,7 @@ static void msm_gpio_irq_ack(struct irq_data *d)
        if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
                msm_gpio_update_dual_edge_pos(pctrl, g, d);
 
-       spin_unlock_irqrestore(&pctrl->lock, flags);
+       raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 }
 
 static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
@@ -641,7 +641,7 @@ static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 
        g = &pctrl->soc->groups[d->hwirq];
 
-       spin_lock_irqsave(&pctrl->lock, flags);
+       raw_spin_lock_irqsave(&pctrl->lock, flags);
 
        /*
         * For hw without possibility of detecting both edges
@@ -715,7 +715,7 @@ static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
        if (test_bit(d->hwirq, pctrl->dual_edge_irqs))
                msm_gpio_update_dual_edge_pos(pctrl, g, d);
 
-       spin_unlock_irqrestore(&pctrl->lock, flags);
+       raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 
        if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
                irq_set_handler_locked(d, handle_level_irq);
@@ -731,11 +731,11 @@ static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
        struct msm_pinctrl *pctrl = to_msm_pinctrl(gc);
        unsigned long flags;
 
-       spin_lock_irqsave(&pctrl->lock, flags);
+       raw_spin_lock_irqsave(&pctrl->lock, flags);
 
        irq_set_irq_wake(pctrl->irq, on);
 
-       spin_unlock_irqrestore(&pctrl->lock, flags);
+       raw_spin_unlock_irqrestore(&pctrl->lock, flags);
 
        return 0;
 }
@@ -881,7 +881,7 @@ int msm_pinctrl_probe(struct platform_device *pdev,
        pctrl->soc = soc_data;
        pctrl->chip = msm_gpio_template;
 
-       spin_lock_init(&pctrl->lock);
+       raw_spin_lock_init(&pctrl->lock);
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        pctrl->regs = devm_ioremap_resource(&pdev->dev, res);
diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index f4424063b860..cbbbebd86c6e 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -1286,7 +1286,7 @@ static void fcoe_percpu_thread_destroy(unsigned int cpu)
        struct sk_buff *skb;
 #ifdef CONFIG_SMP
        struct fcoe_percpu_s *p0;
-       unsigned targ_cpu = get_cpu();
+       unsigned targ_cpu = get_cpu_light();
 #endif /* CONFIG_SMP */
 
        FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);
@@ -1342,7 +1342,7 @@ static void fcoe_percpu_thread_destroy(unsigned int cpu)
                        kfree_skb(skb);
                spin_unlock_bh(&p->fcoe_rx_list.lock);
        }
-       put_cpu();
+       put_cpu_light();
 #else
        /*
         * This a non-SMP scenario where the singular Rx thread is
@@ -1566,11 +1566,11 @@ static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
 static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
 {
        struct fcoe_percpu_s *fps;
-       int rc;
+       int rc, cpu = get_cpu_light();
 
-       fps = &get_cpu_var(fcoe_percpu);
+       fps = &per_cpu(fcoe_percpu, cpu);
        rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
-       put_cpu_var(fcoe_percpu);
+       put_cpu_light();
 
        return rc;
 }
@@ -1766,11 +1766,11 @@ static inline int fcoe_filter_frames(struct fc_lport *lport,
                return 0;
        }
 
-       stats = per_cpu_ptr(lport->stats, get_cpu());
+       stats = per_cpu_ptr(lport->stats, get_cpu_light());
        stats->InvalidCRCCount++;
        if (stats->InvalidCRCCount < 5)
                printk(KERN_WARNING "fcoe: dropping frame with CRC error\n");
-       put_cpu();
+       put_cpu_light();
        return -EINVAL;
 }
 
@@ -1814,7 +1814,7 @@ static void fcoe_recv_frame(struct sk_buff *skb)
         */
        hp = (struct fcoe_hdr *) skb_network_header(skb);
 
-       stats = per_cpu_ptr(lport->stats, get_cpu());
+       stats = per_cpu_ptr(lport->stats, get_cpu_light());
        if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
                if (stats->ErrorFrames < 5)
                        printk(KERN_WARNING "fcoe: FCoE version "
@@ -1846,13 +1846,13 @@ static void fcoe_recv_frame(struct sk_buff *skb)
                goto drop;
 
        if (!fcoe_filter_frames(lport, fp)) {
-               put_cpu();
+               put_cpu_light();
                fc_exch_recv(lport, fp);
                return;
        }
 drop:
        stats->ErrorFrames++;
-       put_cpu();
+       put_cpu_light();
        kfree_skb(skb);
 }
 
diff --git a/drivers/scsi/fcoe/fcoe_ctlr.c b/drivers/scsi/fcoe/fcoe_ctlr.c
index 34a1b1f333b4..d91131210695 100644
--- a/drivers/scsi/fcoe/fcoe_ctlr.c
+++ b/drivers/scsi/fcoe/fcoe_ctlr.c
@@ -831,7 +831,7 @@ static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
 
        INIT_LIST_HEAD(&del_list);
 
-       stats = per_cpu_ptr(fip->lp->stats, get_cpu());
+       stats = per_cpu_ptr(fip->lp->stats, get_cpu_light());
 
        list_for_each_entry_safe(fcf, next, &fip->fcfs, list) {
                deadline = fcf->time + fcf->fka_period + fcf->fka_period / 2;
@@ -867,7 +867,7 @@ static unsigned long fcoe_ctlr_age_fcfs(struct fcoe_ctlr *fip)
                                sel_time = fcf->time;
                }
        }
-       put_cpu();
+       put_cpu_light();
 
        list_for_each_entry_safe(fcf, next, &del_list, list) {
                /* Removes fcf from current list */
diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c
index 30f9ef0c0d4f..6c686bc01a82 100644
--- a/drivers/scsi/libfc/fc_exch.c
+++ b/drivers/scsi/libfc/fc_exch.c
@@ -814,10 +814,10 @@ static struct fc_exch *fc_exch_em_alloc(struct fc_lport *lport,
        }
        memset(ep, 0, sizeof(*ep));
 
-       cpu = get_cpu();
+       cpu = get_cpu_light();
        pool = per_cpu_ptr(mp->pool, cpu);
        spin_lock_bh(&pool->lock);
-       put_cpu();
+       put_cpu_light();
 
        /* peek cache of free slot */
        if (pool->left != FC_XID_UNKNOWN) {
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 6f5e2720ffad..ee8a8ed49b89 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -190,7 +190,7 @@ static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
        /* TODO: audit callers to ensure they are ready for qc_issue to
         * unconditionally re-enable interrupts
         */
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
        spin_unlock(ap->lock);
 
        /* If the device fell off, no sense in issuing commands */
@@ -255,7 +255,7 @@ static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 
  out:
        spin_lock(ap->lock);
-       local_irq_restore(flags);
+       local_irq_restore_nort(flags);
        return ret;
 }
 
diff --git a/drivers/scsi/qla2xxx/qla_inline.h b/drivers/scsi/qla2xxx/qla_inline.h
index fee9eb7c8a60..b42d4adc42dc 100644
--- a/drivers/scsi/qla2xxx/qla_inline.h
+++ b/drivers/scsi/qla2xxx/qla_inline.h
@@ -59,12 +59,12 @@ qla2x00_poll(struct rsp_que *rsp)
 {
        unsigned long flags;
        struct qla_hw_data *ha = rsp->hw;
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
        if (IS_P3P_TYPE(ha))
                qla82xx_poll(0, rsp);
        else
                ha->isp_ops->intr_handler(0, rsp);
-       local_irq_restore(flags);
+       local_irq_restore_nort(flags);
 }
 
 static inline uint8_t *
diff --git a/drivers/thermal/x86_pkg_temp_thermal.c b/drivers/thermal/x86_pkg_temp_thermal.c
index 7fc919f7da4d..e03fa17b8670 100644
--- a/drivers/thermal/x86_pkg_temp_thermal.c
+++ b/drivers/thermal/x86_pkg_temp_thermal.c
@@ -29,6 +29,7 @@
 #include <linux/pm.h>
 #include <linux/thermal.h>
 #include <linux/debugfs.h>
+#include <linux/swork.h>
 #include <asm/cpu_device_id.h>
 #include <asm/mce.h>
 
@@ -352,7 +353,7 @@ static void pkg_temp_thermal_threshold_work_fn(struct work_struct *work)
        }
 }
 
-static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val)
+static void platform_thermal_notify_work(struct swork_event *event)
 {
        unsigned long flags;
        int cpu = smp_processor_id();
@@ -369,7 +370,7 @@ static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val)
                        pkg_work_scheduled[phy_id]) {
                disable_pkg_thres_interrupt();
                spin_unlock_irqrestore(&pkg_work_lock, flags);
-               return -EINVAL;
+               return;
        }
        pkg_work_scheduled[phy_id] = 1;
        spin_unlock_irqrestore(&pkg_work_lock, flags);
@@ -378,9 +379,48 @@ static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val)
        schedule_delayed_work_on(cpu,
                                &per_cpu(pkg_temp_thermal_threshold_work, cpu),
                                msecs_to_jiffies(notify_delay_ms));
+}
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+static struct swork_event notify_work;
+
+static int thermal_notify_work_init(void)
+{
+       int err;
+
+       err = swork_get();
+       if (err)
+               return err;
+
+       INIT_SWORK(&notify_work, platform_thermal_notify_work);
        return 0;
 }
 
+static void thermal_notify_work_cleanup(void)
+{
+       swork_put();
+}
+
+static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val)
+{
+       swork_queue(&notify_work);
+       return 0;
+}
+
+#else  /* !CONFIG_PREEMPT_RT_FULL */
+
+static int thermal_notify_work_init(void) { return 0; }
+
+static void thermal_notify_work_cleanup(void) {  }
+
+static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val)
+{
+       platform_thermal_notify_work(NULL);
+
+       return 0;
+}
+#endif /* CONFIG_PREEMPT_RT_FULL */
+
 static int find_siblings_cpu(int cpu)
 {
        int i;
@@ -584,6 +624,9 @@ static int __init pkg_temp_thermal_init(void)
        if (!x86_match_cpu(pkg_temp_thermal_ids))
                return -ENODEV;
 
+       if (!thermal_notify_work_init())
+               return -ENODEV;
+
        spin_lock_init(&pkg_work_lock);
        platform_thermal_package_notify =
                        pkg_temp_thermal_platform_thermal_notify;
@@ -608,7 +651,7 @@ static int __init pkg_temp_thermal_init(void)
        kfree(pkg_work_scheduled);
        platform_thermal_package_notify = NULL;
        platform_thermal_package_rate_control = NULL;
-
+       thermal_notify_work_cleanup();
        return -ENODEV;
 }
 
@@ -633,6 +676,7 @@ static void __exit pkg_temp_thermal_exit(void)
        mutex_unlock(&phy_dev_list_mutex);
        platform_thermal_package_notify = NULL;
        platform_thermal_package_rate_control = NULL;
+       thermal_notify_work_cleanup();
        for_each_online_cpu(i)
                cancel_delayed_work_sync(
                        &per_cpu(pkg_temp_thermal_threshold_work, i));
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 39126460c1f5..af7701ca4d48 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -58,7 +58,16 @@ static struct uart_driver serial8250_reg;
 
 static unsigned int skip_txen_test; /* force skip of txen test at init time */
 
-#define PASS_LIMIT     512
+/*
+ * On -rt we can have a more delays, and legitimately
+ * so - so don't drop work spuriously and spam the
+ * syslog:
+ */
+#ifdef CONFIG_PREEMPT_RT_FULL
+# define PASS_LIMIT    1000000
+#else
+# define PASS_LIMIT    512
+#endif
 
 #include <asm/serial.h>
 /*
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index d42d66b72d5a..c08e0724a487 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -35,6 +35,7 @@
 #include <linux/nmi.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
+#include <linux/kdb.h>
 #include <linux/uaccess.h>
 #include <linux/pm_runtime.h>
 
@@ -2846,9 +2847,9 @@ void serial8250_console_write(struct uart_8250_port *up, const char *s,
 
        serial8250_rpm_get(up);
 
-       if (port->sysrq)
+       if (port->sysrq || oops_in_progress)
                locked = 0;
-       else if (oops_in_progress)
+       else if (in_kdb_printk())
                locked = spin_trylock_irqsave(&port->lock, flags);
        else
                spin_lock_irqsave(&port->lock, flags);
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 899a77187bde..3ff6363b3751 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2067,13 +2067,19 @@ pl011_console_write(struct console *co, const char *s, unsigned int count)
 
        clk_enable(uap->clk);
 
-       local_irq_save(flags);
+       /*
+        * local_irq_save(flags);
+        *
+        * This local_irq_save() is nonsense. If we come in via sysrq
+        * handling then interrupts are already disabled. Aside of
+        * that the port.sysrq check is racy on SMP regardless.
+       */
        if (uap->port.sysrq)
                locked = 0;
        else if (oops_in_progress)
-               locked = spin_trylock(&uap->port.lock);
+               locked = spin_trylock_irqsave(&uap->port.lock, flags);
        else
-               spin_lock(&uap->port.lock);
+               spin_lock_irqsave(&uap->port.lock, flags);
 
        /*
         *      First save the CR then disable the interrupts
@@ -2098,8 +2104,7 @@ pl011_console_write(struct console *co, const char *s, unsigned int count)
                writew(old_cr, uap->port.membase + UART011_CR);
 
        if (locked)
-               spin_unlock(&uap->port.lock);
-       local_irq_restore(flags);
+               spin_unlock_irqrestore(&uap->port.lock, flags);
 
        clk_disable(uap->clk);
 }
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 21fc9b3a27cf..2e32729e6a83 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -1257,13 +1257,10 @@ serial_omap_console_write(struct console *co, const char *s,
 
        pm_runtime_get_sync(up->dev);
 
-       local_irq_save(flags);
-       if (up->port.sysrq)
-               locked = 0;
-       else if (oops_in_progress)
-               locked = spin_trylock(&up->port.lock);
+       if (up->port.sysrq || oops_in_progress)
+               locked = spin_trylock_irqsave(&up->port.lock, flags);
        else
-               spin_lock(&up->port.lock);
+               spin_lock_irqsave(&up->port.lock, flags);
 
        /*
         * First save the IER then disable the interrupts
@@ -1292,8 +1289,7 @@ serial_omap_console_write(struct console *co, const char *s,
        pm_runtime_mark_last_busy(up->dev);
        pm_runtime_put_autosuspend(up->dev);
        if (locked)
-               spin_unlock(&up->port.lock);
-       local_irq_restore(flags);
+               spin_unlock_irqrestore(&up->port.lock, flags);
 }
 
 static int __init
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 87a83d925eea..995a37bde992 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1738,9 +1738,9 @@ static void __usb_hcd_giveback_urb(struct urb *urb)
         * and no one may trigger the above deadlock situation when
         * running complete() in tasklet.
         */
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
        urb->complete(urb);
-       local_irq_restore(flags);
+       local_irq_restore_nort(flags);
 
        usb_anchor_resume_wakeups(anchor);
        atomic_dec(&urb->use_count);
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 39bb65265bff..49c167d150ce 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -1404,7 +1404,7 @@ static void ffs_data_put(struct ffs_data *ffs)
                pr_info("%s(): freeing\n", __func__);
                ffs_data_clear(ffs);
                BUG_ON(waitqueue_active(&ffs->ev.waitq) ||
-                      waitqueue_active(&ffs->ep0req_completion.wait));
+                      swait_active(&ffs->ep0req_completion.wait));
                kfree(ffs->dev_name);
                kfree(ffs);
        }
diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index 81f3c9cb333c..c996bd43741a 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -346,7 +346,7 @@ ep_io (struct ep_data *epdata, void *buf, unsigned len)
        spin_unlock_irq (&epdata->dev->lock);
 
        if (likely (value == 0)) {
-               value = wait_event_interruptible (done.wait, done.done);
+               value = swait_event_interruptible (done.wait, done.done);
                if (value != 0) {
                        spin_lock_irq (&epdata->dev->lock);
                        if (likely (epdata->ep != NULL)) {
@@ -355,7 +355,7 @@ ep_io (struct ep_data *epdata, void *buf, unsigned len)
                                usb_ep_dequeue (epdata->ep, epdata->req);
                                spin_unlock_irq (&epdata->dev->lock);
 
-                               wait_event (done.wait, done.done);
+                               swait_event (done.wait, done.done);
                                if (epdata->status == -ECONNRESET)
                                        epdata->status = -EINTR;
                        } else {
diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c
index 585cb8734f50..1e469be2c216 100644
--- a/drivers/usb/gadget/udc/atmel_usba_udc.c
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
@@ -17,7 +17,9 @@
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/list.h>
+#include <linux/mfd/syscon.h>
 #include <linux/platform_device.h>
+#include <linux/regmap.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
 #include <linux/usb/atmel_usba_udc.h>
@@ -1890,20 +1892,15 @@ static int atmel_usba_stop(struct usb_gadget *gadget)
 #ifdef CONFIG_OF
 static void at91sam9rl_toggle_bias(struct usba_udc *udc, int is_on)
 {
-       unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
-
-       if (is_on)
-               at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
-       else
-               at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
+       regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN,
+                          is_on ? AT91_PMC_BIASEN : 0);
 }
 
 static void at91sam9g45_pulse_bias(struct usba_udc *udc)
 {
-       unsigned int uckr = at91_pmc_read(AT91_CKGR_UCKR);
-
-       at91_pmc_write(AT91_CKGR_UCKR, uckr & ~(AT91_PMC_BIASEN));
-       at91_pmc_write(AT91_CKGR_UCKR, uckr | AT91_PMC_BIASEN);
+       regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN, 0);
+       regmap_update_bits(udc->pmc, AT91_CKGR_UCKR, AT91_PMC_BIASEN,
+                          AT91_PMC_BIASEN);
 }
 
 static const struct usba_udc_errata at91sam9rl_errata = {
@@ -1940,6 +1937,9 @@ static struct usba_ep * atmel_udc_of_init(struct platform_device *pdev,
                return ERR_PTR(-EINVAL);
 
        udc->errata = match->data;
+       udc->pmc = syscon_regmap_lookup_by_compatible("atmel,at91sam9g45-pmc");
+       if (udc->errata && IS_ERR(udc->pmc))
+               return ERR_CAST(udc->pmc);
 
        udc->num_ep = 0;
 
diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.h b/drivers/usb/gadget/udc/atmel_usba_udc.h
index ea448a344767..3e1c9d589dfa 100644
--- a/drivers/usb/gadget/udc/atmel_usba_udc.h
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.h
@@ -354,6 +354,8 @@ struct usba_udc {
        struct dentry *debugfs_root;
        struct dentry *debugfs_regs;
 #endif
+
+       struct regmap *pmc;
 };
 
 static inline struct usba_ep *to_usba_ep(struct usb_ep *ep)
diff --git a/fs/aio.c b/fs/aio.c
index fe4f49212b99..c3194afdc3df 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -40,6 +40,7 @@
 #include <linux/ramfs.h>
 #include <linux/percpu-refcount.h>
 #include <linux/mount.h>
+#include <linux/swork.h>
 
 #include <asm/kmap_types.h>
 #include <asm/uaccess.h>
@@ -115,7 +116,7 @@ struct kioctx {
        struct page             **ring_pages;
        long                    nr_pages;
 
-       struct work_struct      free_work;
+       struct swork_event      free_work;
 
        /*
         * signals when all in-flight requests are done
@@ -258,6 +259,7 @@ static int __init aio_setup(void)
                .mount          = aio_mount,
                .kill_sb        = kill_anon_super,
        };
+       BUG_ON(swork_get());
        aio_mnt = kern_mount(&aio_fs);
        if (IS_ERR(aio_mnt))
                panic("Failed to create aio fs mount.");
@@ -573,9 +575,9 @@ static int kiocb_cancel(struct aio_kiocb *kiocb)
        return cancel(&kiocb->common);
 }
 
-static void free_ioctx(struct work_struct *work)
+static void free_ioctx(struct swork_event *sev)
 {
-       struct kioctx *ctx = container_of(work, struct kioctx, free_work);
+       struct kioctx *ctx = container_of(sev, struct kioctx, free_work);
 
        pr_debug("freeing %p\n", ctx);
 
@@ -594,8 +596,8 @@ static void free_ioctx_reqs(struct percpu_ref *ref)
        if (ctx->rq_wait && atomic_dec_and_test(&ctx->rq_wait->count))
                complete(&ctx->rq_wait->comp);
 
-       INIT_WORK(&ctx->free_work, free_ioctx);
-       schedule_work(&ctx->free_work);
+       INIT_SWORK(&ctx->free_work, free_ioctx);
+       swork_queue(&ctx->free_work);
 }
 
 /*
@@ -603,9 +605,9 @@ static void free_ioctx_reqs(struct percpu_ref *ref)
  * and ctx->users has dropped to 0, so we know no more kiocbs can be submitted -
  * now it's safe to cancel any that need to be.
  */
-static void free_ioctx_users(struct percpu_ref *ref)
+static void free_ioctx_users_work(struct swork_event *sev)
 {
-       struct kioctx *ctx = container_of(ref, struct kioctx, users);
+       struct kioctx *ctx = container_of(sev, struct kioctx, free_work);
        struct aio_kiocb *req;
 
        spin_lock_irq(&ctx->ctx_lock);
@@ -624,6 +626,14 @@ static void free_ioctx_users(struct percpu_ref *ref)
        percpu_ref_put(&ctx->reqs);
 }
 
+static void free_ioctx_users(struct percpu_ref *ref)
+{
+       struct kioctx *ctx = container_of(ref, struct kioctx, users);
+
+       INIT_SWORK(&ctx->free_work, free_ioctx_users_work);
+       swork_queue(&ctx->free_work);
+}
+
 static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm)
 {
        unsigned i, new_nr;
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index 502d3892d8a4..05af8d3e6e88 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -34,6 +34,7 @@
 #include <linux/sched.h>
 #include <linux/mount.h>
 #include <linux/namei.h>
+#include <linux/delay.h>
 #include <asm/current.h>
 #include <asm/uaccess.h>
 
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index 7a5a598a2d94..d08bcdc30566 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -150,7 +150,7 @@ static struct dentry *get_next_positive_dentry(struct dentry *prev,
                        parent = p->d_parent;
                        if (!spin_trylock(&parent->d_lock)) {
                                spin_unlock(&p->d_lock);
-                               cpu_relax();
+                               cpu_chill();
                                goto relock;
                        }
                        spin_unlock(&p->d_lock);
diff --git a/fs/buffer.c b/fs/buffer.c
index 6f7d519a093b..96b943e924cc 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -305,8 +305,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate)
         * decide that the page is now completely done.
         */
        first = page_buffers(page);
-       local_irq_save(flags);
-       bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
+       flags = bh_uptodate_lock_irqsave(first);
        clear_buffer_async_read(bh);
        unlock_buffer(bh);
        tmp = bh;
@@ -319,8 +318,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate)
                }
                tmp = tmp->b_this_page;
        } while (tmp != bh);
-       bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
-       local_irq_restore(flags);
+       bh_uptodate_unlock_irqrestore(first, flags);
 
        /*
         * If none of the buffers had errors and they are all
@@ -332,9 +330,7 @@ static void end_buffer_async_read(struct buffer_head *bh, int uptodate)
        return;
 
 still_busy:
-       bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
-       local_irq_restore(flags);
-       return;
+       bh_uptodate_unlock_irqrestore(first, flags);
 }
 
 /*
@@ -362,8 +358,7 @@ void end_buffer_async_write(struct buffer_head *bh, int uptodate)
        }
 
        first = page_buffers(page);
-       local_irq_save(flags);
-       bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
+       flags = bh_uptodate_lock_irqsave(first);
 
        clear_buffer_async_write(bh);
        unlock_buffer(bh);
@@ -375,15 +370,12 @@ void end_buffer_async_write(struct buffer_head *bh, int uptodate)
                }
                tmp = tmp->b_this_page;
        }
-       bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
-       local_irq_restore(flags);
+       bh_uptodate_unlock_irqrestore(first, flags);
        end_page_writeback(page);
        return;
 
 still_busy:
-       bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
-       local_irq_restore(flags);
-       return;
+       bh_uptodate_unlock_irqrestore(first, flags);
 }
 EXPORT_SYMBOL(end_buffer_async_write);
 
@@ -3325,6 +3317,7 @@ struct buffer_head *alloc_buffer_head(gfp_t gfp_flags)
        struct buffer_head *ret = kmem_cache_zalloc(bh_cachep, gfp_flags);
        if (ret) {
                INIT_LIST_HEAD(&ret->b_assoc_buffers);
+               buffer_head_init_locks(ret);
                preempt_disable();
                __this_cpu_inc(bh_accounting.nr);
                recalc_bh_state();
diff --git a/fs/dcache.c b/fs/dcache.c
index 3ed642e0a0c2..1437dd042e13 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -19,6 +19,7 @@
 #include <linux/mm.h>
 #include <linux/fs.h>
 #include <linux/fsnotify.h>
+#include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/hash.h>
@@ -774,6 +775,8 @@ static inline bool fast_dput(struct dentry *dentry)
  */
 void dput(struct dentry *dentry)
 {
+       struct dentry *parent;
+
        if (unlikely(!dentry))
                return;
 
@@ -810,9 +813,18 @@ void dput(struct dentry *dentry)
        return;
 
 kill_it:
-       dentry = dentry_kill(dentry);
-       if (dentry) {
-               cond_resched();
+       parent = dentry_kill(dentry);
+       if (parent) {
+               int r;
+
+               if (parent == dentry) {
+                       /* the task with the highest priority won't schedule */
+                       r = cond_resched();
+                       if (!r)
+                               cpu_chill();
+               } else {
+                       dentry = parent;
+               }
                goto repeat;
        }
 }
@@ -2425,7 +2437,7 @@ void d_delete(struct dentry * dentry)
        if (dentry->d_lockref.count == 1) {
                if (!spin_trylock(&inode->i_lock)) {
                        spin_unlock(&dentry->d_lock);
-                       cpu_relax();
+                       cpu_chill();
                        goto again;
                }
                dentry->d_flags &= ~DCACHE_CANT_MOUNT;
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 1b08556776ce..06435352045d 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -505,12 +505,12 @@ static int ep_poll_wakeup_proc(void *priv, void *cookie, int call_nests)
  */
 static void ep_poll_safewake(wait_queue_head_t *wq)
 {
-       int this_cpu = get_cpu();
+       int this_cpu = get_cpu_light();
 
        ep_call_nested(&poll_safewake_ncalls, EP_MAX_NESTS,
                       ep_poll_wakeup_proc, NULL, wq, (void *) (long) this_cpu);
 
-       put_cpu();
+       put_cpu_light();
 }
 
 static void ep_remove_wait_queue(struct eppoll_entry *pwq)
diff --git a/fs/exec.c b/fs/exec.c
index 9c5ee2a880aa..c12e576bb209 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -887,12 +887,14 @@ static int exec_mmap(struct mm_struct *mm)
                }
        }
        task_lock(tsk);
+       preempt_disable_rt();
        active_mm = tsk->active_mm;
        tsk->mm = mm;
        tsk->active_mm = mm;
        activate_mm(active_mm, mm);
        tsk->mm->vmacache_seqnum = 0;
        vmacache_flush(tsk);
+       preempt_enable_rt();
        task_unlock(tsk);
        if (old_mm) {
                up_read(&old_mm->mmap_sem);
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 6ca56f5f72b5..9e145fe7cae0 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -97,8 +97,7 @@ static void ext4_finish_bio(struct bio *bio)
                 * We check all buffers in the page under BH_Uptodate_Lock
                 * to avoid races with other end io clearing async_write flags
                 */
-               local_irq_save(flags);
-               bit_spin_lock(BH_Uptodate_Lock, &head->b_state);
+               flags = bh_uptodate_lock_irqsave(head);
                do {
                        if (bh_offset(bh) < bio_start ||
                            bh_offset(bh) + bh->b_size > bio_end) {
@@ -110,8 +109,7 @@ static void ext4_finish_bio(struct bio *bio)
                        if (bio->bi_error)
                                buffer_io_error(bh);
                } while ((bh = bh->b_this_page) != head);
-               bit_spin_unlock(BH_Uptodate_Lock, &head->b_state);
-               local_irq_restore(flags);
+               bh_uptodate_unlock_irqrestore(head, flags);
                if (!under_io) {
 #ifdef CONFIG_EXT4_FS_ENCRYPTION
                        if (ctx)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 2871576fbca4..d1137790ea58 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -24,7 +24,6 @@
 
 #ifdef CONFIG_F2FS_CHECK_FS
 #define f2fs_bug_on(sbi, condition)    BUG_ON(condition)
-#define f2fs_down_write(x, y)  down_write_nest_lock(x, y)
 #else
 #define f2fs_bug_on(sbi, condition)                                    \
        do {                                                            \
@@ -33,7 +32,6 @@
                        set_sbi_flag(sbi, SBI_NEED_FSCK);               \
                }                                                       \
        } while (0)
-#define f2fs_down_write(x, y)  down_write(x)
 #endif
 
 /*
@@ -959,7 +957,7 @@ static inline void f2fs_unlock_op(struct f2fs_sb_info *sbi)
 
 static inline void f2fs_lock_all(struct f2fs_sb_info *sbi)
 {
-       f2fs_down_write(&sbi->cp_rwsem, &sbi->cp_mutex);
+       down_write(&sbi->cp_rwsem);
 }
 
 static inline void f2fs_unlock_all(struct f2fs_sb_info *sbi)
diff --git a/fs/namespace.c b/fs/namespace.c
index ec4078d16eb7..1780601dcbdd 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -14,6 +14,7 @@
 #include <linux/mnt_namespace.h>
 #include <linux/user_namespace.h>
 #include <linux/namei.h>
+#include <linux/delay.h>
 #include <linux/security.h>
 #include <linux/idr.h>
 #include <linux/init.h>                /* init_rootfs */
@@ -357,8 +358,11 @@ int __mnt_want_write(struct vfsmount *m)
         * incremented count after it has set MNT_WRITE_HOLD.
         */
        smp_mb();
-       while (ACCESS_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD)
-               cpu_relax();
+       while (ACCESS_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD) {
+               preempt_enable();
+               cpu_chill();
+               preempt_disable();
+       }
        /*
         * After the slowpath clears MNT_WRITE_HOLD, mnt_is_readonly will
         * be set to match its requirements. So we must not load that until
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index 7521e11db728..f0de4b6b8bf3 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -107,8 +107,7 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
                                "0x%llx.", (unsigned long long)bh->b_blocknr);
        }
        first = page_buffers(page);
-       local_irq_save(flags);
-       bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
+       flags = bh_uptodate_lock_irqsave(first);
        clear_buffer_async_read(bh);
        unlock_buffer(bh);
        tmp = bh;
@@ -123,8 +122,7 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
                }
                tmp = tmp->b_this_page;
        } while (tmp != bh);
-       bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
-       local_irq_restore(flags);
+       bh_uptodate_unlock_irqrestore(first, flags);
        /*
         * If none of the buffers had errors then we can set the page uptodate,
         * but we first have to perform the post read mst fixups, if the
@@ -145,13 +143,13 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
                recs = PAGE_CACHE_SIZE / rec_size;
                /* Should have been verified before we got here... */
                BUG_ON(!recs);
-               local_irq_save(flags);
+               local_irq_save_nort(flags);
                kaddr = kmap_atomic(page);
                for (i = 0; i < recs; i++)
                        post_read_mst_fixup((NTFS_RECORD*)(kaddr +
                                        i * rec_size), rec_size);
                kunmap_atomic(kaddr);
-               local_irq_restore(flags);
+               local_irq_restore_nort(flags);
                flush_dcache_page(page);
                if (likely(page_uptodate && !PageError(page)))
                        SetPageUptodate(page);
@@ -159,9 +157,7 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
        unlock_page(page);
        return;
 still_busy:
-       bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
-       local_irq_restore(flags);
-       return;
+       bh_uptodate_unlock_irqrestore(first, flags);
 }
 
 /**
diff --git a/fs/timerfd.c b/fs/timerfd.c
index 1327a02ec778..4260febcb029 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -461,7 +461,10 @@ static int do_timerfd_settime(int ufd, int flags,
                                break;
                }
                spin_unlock_irq(&ctx->wqh.lock);
-               cpu_relax();
+               if (isalarm(ctx))
+                       hrtimer_wait_for_timer(&ctx->t.alarm.timer);
+               else
+                       hrtimer_wait_for_timer(&ctx->t.tmr);
        }
 
        /*
diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
index 323e5daece54..cc5fbd534fd4 100644
--- a/include/acpi/platform/aclinux.h
+++ b/include/acpi/platform/aclinux.h
@@ -127,6 +127,7 @@
 
 #define acpi_cache_t                        struct kmem_cache
 #define acpi_spinlock                       spinlock_t *
+#define acpi_raw_spinlock              raw_spinlock_t *
 #define acpi_cpu_flags                      unsigned long
 
 /* Use native linux version of acpi_os_allocate_zeroed */
@@ -145,6 +146,20 @@
 #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_get_thread_id
 #define ACPI_USE_ALTERNATE_PROTOTYPE_acpi_os_create_lock
 
+#define acpi_os_create_raw_lock(__handle)                      \
+({                                                             \
+        raw_spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock));   \
+                                                               \
+        if (lock) {                                            \
+               *(__handle) = lock;                             \
+               raw_spin_lock_init(*(__handle));                \
+        }                                                      \
+        lock ? AE_OK : AE_NO_MEMORY;                           \
+ })
+
+#define acpi_os_delete_raw_lock(__handle)      kfree(__handle)
+
+
 /*
  * OSL interfaces used by debugger/disassembler
  */
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index 630dd2372238..850e4d993a88 100644
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -206,6 +206,20 @@ extern void warn_slowpath_null(const char *file, const int line);
 # define WARN_ON_SMP(x)                        ({0;})
 #endif
 
+#ifdef CONFIG_PREEMPT_RT_BASE
+# define BUG_ON_RT(c)                  BUG_ON(c)
+# define BUG_ON_NONRT(c)               do { } while (0)
+# define WARN_ON_RT(condition)         WARN_ON(condition)
+# define WARN_ON_NONRT(condition)      do { } while (0)
+# define WARN_ON_ONCE_NONRT(condition) do { } while (0)
+#else
+# define BUG_ON_RT(c)                  do { } while (0)
+# define BUG_ON_NONRT(c)               BUG_ON(c)
+# define WARN_ON_RT(condition)         do { } while (0)
+# define WARN_ON_NONRT(condition)      WARN_ON(condition)
+# define WARN_ON_ONCE_NONRT(condition) WARN_ON_ONCE(condition)
+#endif
+
 #endif /* __ASSEMBLY__ */
 
 #endif
diff --git a/include/asm-generic/preempt.h b/include/asm-generic/preempt.h
index 5d8ffa3e6f8c..c1cde3577551 100644
--- a/include/asm-generic/preempt.h
+++ b/include/asm-generic/preempt.h
@@ -7,10 +7,10 @@
 
 static __always_inline int preempt_count(void)
 {
-       return current_thread_info()->preempt_count;
+       return READ_ONCE(current_thread_info()->preempt_count);
 }
 
-static __always_inline int *preempt_count_ptr(void)
+static __always_inline volatile int *preempt_count_ptr(void)
 {
        return &current_thread_info()->preempt_count;
 }
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index daf17d70aeca..463df8954255 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -212,6 +212,7 @@ static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
 
 struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index);
 struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int);
+void __blk_mq_complete_request_remote_work(struct work_struct *work);
 
 int blk_mq_request_started(struct request *rq);
 void blk_mq_start_request(struct request *rq);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index fe14382f9664..a82143ad6702 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -89,6 +89,7 @@ struct request {
        struct list_head queuelist;
        union {
                struct call_single_data csd;
+               struct work_struct work;
                unsigned long fifo_time;
        };
 
@@ -455,7 +456,7 @@ struct request_queue {
        struct throtl_data *td;
 #endif
        struct rcu_head         rcu_head;
-       wait_queue_head_t       mq_freeze_wq;
+       struct swait_queue_head mq_freeze_wq;
        struct percpu_ref       q_usage_counter;
        struct list_head        all_q_node;
 
diff --git a/include/linux/bottom_half.h b/include/linux/bottom_half.h
index 8fdcb783197d..d07dbeec7bc1 100644
--- a/include/linux/bottom_half.h
+++ b/include/linux/bottom_half.h
@@ -3,6 +3,39 @@
 
 #include <linux/preempt.h>
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+
+extern void __local_bh_disable(void);
+extern void _local_bh_enable(void);
+extern void __local_bh_enable(void);
+
+static inline void local_bh_disable(void)
+{
+       __local_bh_disable();
+}
+
+static inline void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
+{
+       __local_bh_disable();
+}
+
+static inline void local_bh_enable(void)
+{
+       __local_bh_enable();
+}
+
+static inline void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
+{
+       __local_bh_enable();
+}
+
+static inline void local_bh_enable_ip(unsigned long ip)
+{
+       __local_bh_enable();
+}
+
+#else
+
 #ifdef CONFIG_TRACE_IRQFLAGS
 extern void __local_bh_disable_ip(unsigned long ip, unsigned int cnt);
 #else
@@ -30,5 +63,6 @@ static inline void local_bh_enable(void)
 {
        __local_bh_enable_ip(_THIS_IP_, SOFTIRQ_DISABLE_OFFSET);
 }
+#endif
 
 #endif /* _LINUX_BH_H */
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 6fe974dbe741..7242505af75c 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -75,8 +75,50 @@ struct buffer_head {
        struct address_space *b_assoc_map;      /* mapping this buffer is
                                                   associated with */
        atomic_t b_count;               /* users using this buffer_head */
+#ifdef CONFIG_PREEMPT_RT_BASE
+       spinlock_t b_uptodate_lock;
+#if IS_ENABLED(CONFIG_JBD2)
+       spinlock_t b_state_lock;
+       spinlock_t b_journal_head_lock;
+#endif
+#endif
 };
 
+static inline unsigned long bh_uptodate_lock_irqsave(struct buffer_head *bh)
+{
+       unsigned long flags;
+
+#ifndef CONFIG_PREEMPT_RT_BASE
+       local_irq_save(flags);
+       bit_spin_lock(BH_Uptodate_Lock, &bh->b_state);
+#else
+       spin_lock_irqsave(&bh->b_uptodate_lock, flags);
+#endif
+       return flags;
+}
+
+static inline void
+bh_uptodate_unlock_irqrestore(struct buffer_head *bh, unsigned long flags)
+{
+#ifndef CONFIG_PREEMPT_RT_BASE
+       bit_spin_unlock(BH_Uptodate_Lock, &bh->b_state);
+       local_irq_restore(flags);
+#else
+       spin_unlock_irqrestore(&bh->b_uptodate_lock, flags);
+#endif
+}
+
+static inline void buffer_head_init_locks(struct buffer_head *bh)
+{
+#ifdef CONFIG_PREEMPT_RT_BASE
+       spin_lock_init(&bh->b_uptodate_lock);
+#if IS_ENABLED(CONFIG_JBD2)
+       spin_lock_init(&bh->b_state_lock);
+       spin_lock_init(&bh->b_journal_head_lock);
+#endif
+#endif
+}
+
 /*
  * macro tricks to expand the set_buffer_foo(), clear_buffer_foo()
  * and buffer_foo() functions.
diff --git a/include/linux/cgroup-defs.h b/include/linux/cgroup-defs.h
index 8da263299754..0cc474291e08 100644
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -16,6 +16,7 @@
 #include <linux/percpu-refcount.h>
 #include <linux/percpu-rwsem.h>
 #include <linux/workqueue.h>
+#include <linux/swork.h>
 
 #ifdef CONFIG_CGROUPS
 
@@ -142,6 +143,7 @@ struct cgroup_subsys_state {
        /* percpu_ref killing and RCU release */
        struct rcu_head rcu_head;
        struct work_struct destroy_work;
+       struct swork_event destroy_swork;
 };
 
 /*
diff --git a/include/linux/clk/at91_pmc.h b/include/linux/clk/at91_pmc.h
index 1e6932222e11..17f413bbbedf 100644
--- a/include/linux/clk/at91_pmc.h
+++ b/include/linux/clk/at91_pmc.h
@@ -16,18 +16,6 @@
 #ifndef AT91_PMC_H
 #define AT91_PMC_H
 
-#ifndef __ASSEMBLY__
-extern void __iomem *at91_pmc_base;
-
-#define at91_pmc_read(field) \
-       readl_relaxed(at91_pmc_base + field)
-
-#define at91_pmc_write(field, value) \
-       writel_relaxed(value, at91_pmc_base + field)
-#else
-.extern at91_pmc_base
-#endif
-
 #define        AT91_PMC_SCER           0x00                    /* System Clock Enable Register */
 #define        AT91_PMC_SCDR           0x04                    /* System Clock Disable Register */
 
diff --git a/include/linux/completion.h b/include/linux/completion.h
index 5d5aaae3af43..3bca1590e29f 100644
--- a/include/linux/completion.h
+++ b/include/linux/completion.h
@@ -7,8 +7,7 @@
  * Atomic wait-for-completion handler data structures.
  * See kernel/sched/completion.c for details.
  */
-
-#include <linux/wait.h>
+#include <linux/swait.h>
 
 /*
  * struct completion - structure used to maintain state for a "completion"
@@ -24,11 +23,11 @@
  */
 struct completion {
        unsigned int done;
-       wait_queue_head_t wait;
+       struct swait_queue_head wait;
 };
 
 #define COMPLETION_INITIALIZER(work) \
-       { 0, __WAIT_QUEUE_HEAD_INITIALIZER((work).wait) }
+       { 0, __SWAIT_QUEUE_HEAD_INITIALIZER((work).wait) }
 
 #define COMPLETION_INITIALIZER_ONSTACK(work) \
        ({ init_completion(&work); work; })
@@ -73,7 +72,7 @@ struct completion {
 static inline void init_completion(struct completion *x)
 {
        x->done = 0;
-       init_waitqueue_head(&x->wait);
+       init_swait_queue_head(&x->wait);
 }
 
 /**
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 7e04bcd9af8e..e7fa0f6935e6 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -231,6 +231,8 @@ extern void get_online_cpus(void);
 extern void put_online_cpus(void);
 extern void cpu_hotplug_disable(void);
 extern void cpu_hotplug_enable(void);
+extern void pin_current_cpu(void);
+extern void unpin_current_cpu(void);
 #define hotcpu_notifier(fn, pri)       cpu_notifier(fn, pri)
 #define __hotcpu_notifier(fn, pri)     __cpu_notifier(fn, pri)
 #define register_hotcpu_notifier(nb)   register_cpu_notifier(nb)
@@ -248,6 +250,8 @@ static inline void cpu_hotplug_done(void) {}
 #define put_online_cpus()      do { } while (0)
 #define cpu_hotplug_disable()  do { } while (0)
 #define cpu_hotplug_enable()   do { } while (0)
+static inline void pin_current_cpu(void) { }
+static inline void unpin_current_cpu(void) { }
 #define hotcpu_notifier(fn, pri)       do { (void)(fn); } while (0)
 #define __hotcpu_notifier(fn, pri)     do { (void)(fn); } while (0)
 /* These aren't inline functions due to a GCC bug. */
diff --git a/include/linux/delay.h b/include/linux/delay.h
index a6ecb34cf547..37caab306336 100644
--- a/include/linux/delay.h
+++ b/include/linux/delay.h
@@ -52,4 +52,10 @@ static inline void ssleep(unsigned int seconds)
        msleep(seconds * 1000);
 }
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+extern void cpu_chill(void);
+#else
+# define cpu_chill()   cpu_relax()
+#endif
+
 #endif /* defined(_LINUX_DELAY_H) */
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 60048c50404e..f2cd67624f18 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -694,6 +694,18 @@ static inline void __ftrace_enabled_restore(int enabled)
 #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5))
 #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6))
 
+static inline unsigned long get_lock_parent_ip(void)
+{
+       unsigned long addr = CALLER_ADDR0;
+
+       if (!in_lock_functions(addr))
+               return addr;
+       addr = CALLER_ADDR1;
+       if (!in_lock_functions(addr))
+               return addr;
+       return CALLER_ADDR2;
+}
+
 #ifdef CONFIG_IRQSOFF_TRACER
   extern void time_hardirqs_on(unsigned long a0, unsigned long a1);
   extern void time_hardirqs_off(unsigned long a0, unsigned long a1);
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index bb3f3297062a..a117a33ef72c 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -7,6 +7,7 @@
 #include <linux/mm.h>
 #include <linux/uaccess.h>
 #include <linux/hardirq.h>
+#include <linux/sched.h>
 
 #include <asm/cacheflush.h>
 
@@ -65,7 +66,7 @@ static inline void kunmap(struct page *page)
 
 static inline void *kmap_atomic(struct page *page)
 {
-       preempt_disable();
+       preempt_disable_nort();
        pagefault_disable();
        return page_address(page);
 }
@@ -74,7 +75,7 @@ static inline void *kmap_atomic(struct page *page)
 static inline void __kunmap_atomic(void *addr)
 {
        pagefault_enable();
-       preempt_enable();
+       preempt_enable_nort();
 }
 
 #define kmap_atomic_pfn(pfn)   kmap_atomic(pfn_to_page(pfn))
@@ -86,32 +87,51 @@ static inline void __kunmap_atomic(void *addr)
 
 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 DECLARE_PER_CPU(int, __kmap_atomic_idx);
+#endif
 
 static inline int kmap_atomic_idx_push(void)
 {
+#ifndef CONFIG_PREEMPT_RT_FULL
        int idx = __this_cpu_inc_return(__kmap_atomic_idx) - 1;
 
-#ifdef CONFIG_DEBUG_HIGHMEM
+# ifdef CONFIG_DEBUG_HIGHMEM
        WARN_ON_ONCE(in_irq() && !irqs_disabled());
        BUG_ON(idx >= KM_TYPE_NR);
-#endif
+# endif
        return idx;
+#else
+       current->kmap_idx++;
+       BUG_ON(current->kmap_idx > KM_TYPE_NR);
+       return current->kmap_idx - 1;
+#endif
 }
 
 static inline int kmap_atomic_idx(void)
 {
+#ifndef CONFIG_PREEMPT_RT_FULL
        return __this_cpu_read(__kmap_atomic_idx) - 1;
+#else
+       return current->kmap_idx - 1;
+#endif
 }
 
 static inline void kmap_atomic_idx_pop(void)
 {
-#ifdef CONFIG_DEBUG_HIGHMEM
+#ifndef CONFIG_PREEMPT_RT_FULL
+# ifdef CONFIG_DEBUG_HIGHMEM
        int idx = __this_cpu_dec_return(__kmap_atomic_idx);
 
        BUG_ON(idx < 0);
-#else
+# else
        __this_cpu_dec(__kmap_atomic_idx);
+# endif
+#else
+       current->kmap_idx--;
+# ifdef CONFIG_DEBUG_HIGHMEM
+       BUG_ON(current->kmap_idx < 0);
+# endif
 #endif
 }
 
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 2ead22dd74a0..ff317006d3e8 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -87,6 +87,9 @@ enum hrtimer_restart {
  * @function:  timer expiry callback function
  * @base:      pointer to the timer base (per cpu and per clock)
  * @state:     state information (See bit values above)
+ * @cb_entry:  list entry to defer timers from hardirq context
+ * @irqsafe:   timer can run in hardirq context
+ * @praecox:   timer expiry time if expired at the time of programming
  * @is_rel:    Set if the timer was armed relative
  * @start_pid:  timer statistics field to store the pid of the task which
  *             started the timer
@@ -103,6 +106,11 @@ struct hrtimer {
        enum hrtimer_restart            (*function)(struct hrtimer *);
        struct hrtimer_clock_base       *base;
        u8                              state;
+       struct list_head                cb_entry;
+       int                             irqsafe;
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+       ktime_t                         praecox;
+#endif
        u8                              is_rel;
 #ifdef CONFIG_TIMER_STATS
        int                             start_pid;
@@ -123,11 +131,7 @@ struct hrtimer_sleeper {
        struct task_struct *task;
 };
 
-#ifdef CONFIG_64BIT
 # define HRTIMER_CLOCK_BASE_ALIGN      64
-#else
-# define HRTIMER_CLOCK_BASE_ALIGN      32
-#endif
 
 /**
  * struct hrtimer_clock_base - the timer base for a specific clock
@@ -136,6 +140,7 @@ struct hrtimer_sleeper {
  *                     timer to a base on another cpu.
  * @clockid:           clock id for per_cpu support
  * @active:            red black tree root node for the active timers
+ * @expired:           list head for deferred timers.
  * @get_time:          function to retrieve the current time of the clock
  * @offset:            offset of this clock to the monotonic base
  */
@@ -144,6 +149,7 @@ struct hrtimer_clock_base {
        int                     index;
        clockid_t               clockid;
        struct timerqueue_head  active;
+       struct list_head        expired;
        ktime_t                 (*get_time)(void);
        ktime_t                 offset;
 } __attribute__((__aligned__(HRTIMER_CLOCK_BASE_ALIGN)));
@@ -187,6 +193,7 @@ struct hrtimer_cpu_base {
        raw_spinlock_t                  lock;
        seqcount_t                      seq;
        struct hrtimer                  *running;
+       struct hrtimer                  *running_soft;
        unsigned int                    cpu;
        unsigned int                    active_bases;
        unsigned int                    clock_was_set_seq;
@@ -202,6 +209,9 @@ struct hrtimer_cpu_base {
        unsigned int                    nr_retries;
        unsigned int                    nr_hangs;
        unsigned int                    max_hang_time;
+#endif
+#ifdef CONFIG_PREEMPT_RT_BASE
+       wait_queue_head_t               wait;
 #endif
        struct hrtimer_clock_base       clock_base[HRTIMER_MAX_CLOCK_BASES];
 } ____cacheline_aligned;
@@ -412,6 +422,13 @@ static inline void hrtimer_restart(struct hrtimer *timer)
        hrtimer_start_expires(timer, HRTIMER_MODE_ABS);
 }
 
+/* Softirq preemption could deadlock timer removal */
+#ifdef CONFIG_PREEMPT_RT_BASE
+  extern void hrtimer_wait_for_timer(const struct hrtimer *timer);
+#else
+# define hrtimer_wait_for_timer(timer) do { cpu_relax(); } while (0)
+#endif
+
 /* Query timers: */
 extern ktime_t __hrtimer_get_remaining(const struct hrtimer *timer, bool adjust);
 
@@ -436,9 +453,15 @@ static inline int hrtimer_is_queued(struct hrtimer *timer)
  * Helper function to check, whether the timer is running the callback
  * function
  */
-static inline int hrtimer_callback_running(struct hrtimer *timer)
+static inline int hrtimer_callback_running(const struct hrtimer *timer)
 {
-       return timer->base->cpu_base->running == timer;
+       if (timer->base->cpu_base->running == timer)
+               return 1;
+#ifdef CONFIG_PREEMPT_RT_BASE
+       if (timer->base->cpu_base->running_soft == timer)
+               return 1;
+#endif
+       return 0;
 }
 
 /* Forward a hrtimer so it expires after now: */
diff --git a/include/linux/idr.h b/include/linux/idr.h
index 013fd9bc4cb6..f62be0aec911 100644
--- a/include/linux/idr.h
+++ b/include/linux/idr.h
@@ -95,10 +95,14 @@ bool idr_is_empty(struct idr *idp);
  * Each idr_preload() should be matched with an invocation of this
  * function.  See idr_preload() for details.
  */
+#ifdef CONFIG_PREEMPT_RT_FULL
+void idr_preload_end(void);
+#else
 static inline void idr_preload_end(void)
 {
        preempt_enable();
 }
+#endif
 
 /**
  * idr_find - return pointer for given id
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 1c1ff7e4faa4..60fadde71a44 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -148,9 +148,15 @@ extern struct task_group root_task_group;
 # define INIT_PERF_EVENTS(tsk)
 #endif
 
+#ifdef CONFIG_PREEMPT_RT_BASE
+# define INIT_TIMER_LIST               .posix_timer_list = NULL,
+#else
+# define INIT_TIMER_LIST
+#endif
+
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
 # define INIT_VTIME(tsk)                                               \
-       .vtime_seqlock = __SEQLOCK_UNLOCKED(tsk.vtime_seqlock), \
+       .vtime_seqcount = SEQCNT_ZERO(tsk.vtime_seqcount),      \
        .vtime_snap = 0,                                \
        .vtime_snap_whence = VTIME_SYS,
 #else
@@ -239,6 +245,7 @@ extern struct task_group root_task_group;
        .cpu_timers     = INIT_CPU_TIMERS(tsk.cpu_timers),              \
        .pi_lock        = __RAW_SPIN_LOCK_UNLOCKED(tsk.pi_lock),        \
        .timer_slack_ns = 50000, /* 50 usec default slack */            \
+       INIT_TIMER_LIST                                                 \
        .pids = {                                                       \
                [PIDTYPE_PID]  = INIT_PID_LINK(PIDTYPE_PID),            \
                [PIDTYPE_PGID] = INIT_PID_LINK(PIDTYPE_PGID),           \
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index ad16809c8596..655cee096aed 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -61,6 +61,7 @@
  *                interrupt handler after suspending interrupts. For system
  *                wakeup devices users need to implement wakeup detection in
  *                their interrupt handlers.
+ * IRQF_NO_SOFTIRQ_CALL - Do not process softirqs in the irq thread context (RT)
  */
 #define IRQF_SHARED            0x00000080
 #define IRQF_PROBE_SHARED      0x00000100
@@ -74,6 +75,7 @@
 #define IRQF_NO_THREAD         0x00010000
 #define IRQF_EARLY_RESUME      0x00020000
 #define IRQF_COND_SUSPEND      0x00040000
+#define IRQF_NO_SOFTIRQ_CALL   0x00080000
 
 #define IRQF_TIMER             (__IRQF_TIMER | IRQF_NO_SUSPEND | IRQF_NO_THREAD)
 
@@ -186,7 +188,7 @@ extern void devm_free_irq(struct device *dev, unsigned int irq, void *dev_id);
 #ifdef CONFIG_LOCKDEP
 # define local_irq_enable_in_hardirq() do { } while (0)
 #else
-# define local_irq_enable_in_hardirq() local_irq_enable()
+# define local_irq_enable_in_hardirq() local_irq_enable_nort()
 #endif
 
 extern void disable_irq_nosync(unsigned int irq);
@@ -206,6 +208,7 @@ extern void resume_device_irqs(void);
  * @irq:               Interrupt to which notification applies
  * @kref:              Reference count, for internal use
  * @work:              Work item, for internal use
+ * @list:              List item for deferred callbacks
  * @notify:            Function to be called on change.  This will be
  *                     called in process context.
  * @release:           Function to be called on release.  This will be
@@ -217,6 +220,7 @@ struct irq_affinity_notify {
        unsigned int irq;
        struct kref kref;
        struct work_struct work;
+       struct list_head list;
        void (*notify)(struct irq_affinity_notify *, const cpumask_t *mask);
        void (*release)(struct kref *ref);
 };
@@ -379,9 +383,13 @@ extern int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
                                 bool state);
 
 #ifdef CONFIG_IRQ_FORCED_THREADING
+# ifndef CONFIG_PREEMPT_RT_BASE
 extern bool force_irqthreads;
+# else
+#  define force_irqthreads     (true)
+# endif
 #else
-#define force_irqthreads       (0)
+#define force_irqthreads       (false)
 #endif
 
 #ifndef __ARCH_SET_SOFTIRQ_PENDING
@@ -438,9 +446,10 @@ struct softirq_action
        void    (*action)(struct softirq_action *);
 };
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 asmlinkage void do_softirq(void);
 asmlinkage void __do_softirq(void);
-
+static inline void thread_do_softirq(void) { do_softirq(); }
 #ifdef __ARCH_HAS_DO_SOFTIRQ
 void do_softirq_own_stack(void);
 #else
@@ -449,13 +458,25 @@ static inline void do_softirq_own_stack(void)
        __do_softirq();
 }
 #endif
+#else
+extern void thread_do_softirq(void);
+#endif
 
 extern void open_softirq(int nr, void (*action)(struct softirq_action *));
 extern void softirq_init(void);
 extern void __raise_softirq_irqoff(unsigned int nr);
+#ifdef CONFIG_PREEMPT_RT_FULL
+extern void __raise_softirq_irqoff_ksoft(unsigned int nr);
+#else
+static inline void __raise_softirq_irqoff_ksoft(unsigned int nr)
+{
+       __raise_softirq_irqoff(nr);
+}
+#endif
 
 extern void raise_softirq_irqoff(unsigned int nr);
 extern void raise_softirq(unsigned int nr);
+extern void softirq_check_pending_idle(void);
 
 DECLARE_PER_CPU(struct task_struct *, ksoftirqd);
 
@@ -477,8 +498,9 @@ static inline struct task_struct *this_cpu_ksoftirqd(void)
      to be executed on some cpu at least once after this.
    * If the tasklet is already scheduled, but its execution is still not
      started, it will be executed only once.
-   * If this tasklet is already running on another CPU (or schedule is called
-     from tasklet itself), it is rescheduled for later.
+   * If this tasklet is already running on another CPU, it is rescheduled
+     for later.
+   * Schedule must not be called from the tasklet itself (a lockup occurs)
    * Tasklet is strictly serialized wrt itself, but not
      wrt another tasklets. If client needs some intertask synchronization,
      he makes it with spinlocks.
@@ -503,27 +525,36 @@ struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
 enum
 {
        TASKLET_STATE_SCHED,    /* Tasklet is scheduled for execution */
-       TASKLET_STATE_RUN       /* Tasklet is running (SMP only) */
+       TASKLET_STATE_RUN,      /* Tasklet is running (SMP only) */
+       TASKLET_STATE_PENDING   /* Tasklet is pending */
 };
 
-#ifdef CONFIG_SMP
+#define TASKLET_STATEF_SCHED   (1 << TASKLET_STATE_SCHED)
+#define TASKLET_STATEF_RUN     (1 << TASKLET_STATE_RUN)
+#define TASKLET_STATEF_PENDING (1 << TASKLET_STATE_PENDING)
+
+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
 static inline int tasklet_trylock(struct tasklet_struct *t)
 {
        return !test_and_set_bit(TASKLET_STATE_RUN, &(t)->state);
 }
 
+static inline int tasklet_tryunlock(struct tasklet_struct *t)
+{
+       return cmpxchg(&t->state, TASKLET_STATEF_RUN, 0) == TASKLET_STATEF_RUN;
+}
+
 static inline void tasklet_unlock(struct tasklet_struct *t)
 {
        smp_mb__before_atomic();
        clear_bit(TASKLET_STATE_RUN, &(t)->state);
 }
 
-static inline void tasklet_unlock_wait(struct tasklet_struct *t)
-{
-       while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
-}
+extern void tasklet_unlock_wait(struct tasklet_struct *t);
+
 #else
 #define tasklet_trylock(t) 1
+#define tasklet_tryunlock(t)   1
 #define tasklet_unlock_wait(t) do { } while (0)
 #define tasklet_unlock(t) do { } while (0)
 #endif
@@ -572,12 +603,7 @@ static inline void tasklet_disable(struct tasklet_struct *t)
        smp_mb();
 }
 
-static inline void tasklet_enable(struct tasklet_struct *t)
-{
-       smp_mb__before_atomic();
-       atomic_dec(&t->count);
-}
-
+extern void tasklet_enable(struct tasklet_struct *t);
 extern void tasklet_kill(struct tasklet_struct *t);
 extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
 extern void tasklet_init(struct tasklet_struct *t,
@@ -608,6 +634,12 @@ void tasklet_hrtimer_cancel(struct tasklet_hrtimer *ttimer)
        tasklet_kill(&ttimer->tasklet);
 }
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+extern void softirq_early_init(void);
+#else
+static inline void softirq_early_init(void) { }
+#endif
+
 /*
  * Autoprobing for irqs:
  *
diff --git a/include/linux/irq.h b/include/linux/irq.h
index f7cade00c525..dac9e11ba037 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -72,6 +72,7 @@ enum irqchip_irq_state;
  * IRQ_IS_POLLED               - Always polled by another interrupt. Exclude
  *                               it from the spurious interrupt detection
  *                               mechanism and from core side polling.
+ * IRQ_NO_SOFTIRQ_CALL         - No softirq processing in the irq thread context (RT)
  * IRQ_DISABLE_UNLAZY          - Disable lazy irq disable
  */
 enum {
@@ -99,13 +100,14 @@ enum {
        IRQ_PER_CPU_DEVID       = (1 << 17),
        IRQ_IS_POLLED           = (1 << 18),
        IRQ_DISABLE_UNLAZY      = (1 << 19),
+       IRQ_NO_SOFTIRQ_CALL     = (1 << 20),
 };
 
 #define IRQF_MODIFY_MASK       \
        (IRQ_TYPE_SENSE_MASK | IRQ_NOPROBE | IRQ_NOREQUEST | \
         IRQ_NOAUTOEN | IRQ_MOVE_PCNTXT | IRQ_LEVEL | IRQ_NO_BALANCING | \
         IRQ_PER_CPU | IRQ_NESTED_THREAD | IRQ_NOTHREAD | IRQ_PER_CPU_DEVID | \
-        IRQ_IS_POLLED | IRQ_DISABLE_UNLAZY)
+        IRQ_IS_POLLED | IRQ_DISABLE_UNLAZY | IRQ_NO_SOFTIRQ_CALL)
 
 #define IRQ_NO_BALANCING_MASK  (IRQ_PER_CPU | IRQ_NO_BALANCING)
 
diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h
index 47b9ebd4a74f..2543aab05daa 100644
--- a/include/linux/irq_work.h
+++ b/include/linux/irq_work.h
@@ -16,6 +16,7 @@
 #define IRQ_WORK_BUSY          2UL
 #define IRQ_WORK_FLAGS         3UL
 #define IRQ_WORK_LAZY          4UL /* Doesn't want IPI, wait for tick */
+#define IRQ_WORK_HARD_IRQ      8UL /* Run hard IRQ context, even on RT */
 
 struct irq_work {
        unsigned long flags;
@@ -51,4 +52,10 @@ static inline bool irq_work_needs_cpu(void) { return false; }
 static inline void irq_work_run(void) { }
 #endif
 
+#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_PREEMPT_RT_FULL)
+void irq_work_tick_soft(void);
+#else
+static inline void irq_work_tick_soft(void) { }
+#endif
+
 #endif /* _LINUX_IRQ_WORK_H */
diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
index a587a33363c7..ad57402a242d 100644
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -61,6 +61,7 @@ struct irq_desc {
        unsigned int            irqs_unhandled;
        atomic_t                threads_handled;
        int                     threads_handled_last;
+       u64                     random_ip;
        raw_spinlock_t          lock;
        struct cpumask          *percpu_enabled;
 #ifdef CONFIG_SMP
diff --git a/include/linux/irqflags.h b/include/linux/irqflags.h
index 5dd1272d1ab2..9b77034f7c5e 100644
--- a/include/linux/irqflags.h
+++ b/include/linux/irqflags.h
@@ -25,8 +25,6 @@
 # define trace_softirqs_enabled(p)     ((p)->softirqs_enabled)
 # define trace_hardirq_enter() do { current->hardirq_context++; } while (0)
 # define trace_hardirq_exit()  do { current->hardirq_context--; } while (0)
-# define lockdep_softirq_enter()       do { current->softirq_context++; } while (0)
-# define lockdep_softirq_exit()        do { current->softirq_context--; } while (0)
 # define INIT_TRACE_IRQFLAGS   .softirqs_enabled = 1,
 #else
 # define trace_hardirqs_on()           do { } while (0)
@@ -39,9 +37,15 @@
 # define trace_softirqs_enabled(p)     0
 # define trace_hardirq_enter()         do { } while (0)
 # define trace_hardirq_exit()          do { } while (0)
+# define INIT_TRACE_IRQFLAGS
+#endif
+
+#if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT_FULL)
+# define lockdep_softirq_enter() do { current->softirq_context++; } while (0)
+# define lockdep_softirq_exit()         do { current->softirq_context--; } while (0)
+#else
 # define lockdep_softirq_enter()       do { } while (0)
 # define lockdep_softirq_exit()                do { } while (0)
-# define INIT_TRACE_IRQFLAGS
 #endif
 
 #if defined(CONFIG_IRQSOFF_TRACER) || \
@@ -148,4 +152,23 @@
 
 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
 
+/*
+ * local_irq* variants depending on RT/!RT
+ */
+#ifdef CONFIG_PREEMPT_RT_FULL
+# define local_irq_disable_nort()      do { } while (0)
+# define local_irq_enable_nort()       do { } while (0)
+# define local_irq_save_nort(flags)    local_save_flags(flags)
+# define local_irq_restore_nort(flags) (void)(flags)
+# define local_irq_disable_rt()                local_irq_disable()
+# define local_irq_enable_rt()         local_irq_enable()
+#else
+# define local_irq_disable_nort()      local_irq_disable()
+# define local_irq_enable_nort()       local_irq_enable()
+# define local_irq_save_nort(flags)    local_irq_save(flags)
+# define local_irq_restore_nort(flags) local_irq_restore(flags)
+# define local_irq_disable_rt()                do { } while (0)
+# define local_irq_enable_rt()         do { } while (0)
+#endif
+
 #endif
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 65407f6c9120..eb5aabe4e18c 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -352,32 +352,56 @@ static inline struct journal_head *bh2jh(struct buffer_head *bh)
 
 static inline void jbd_lock_bh_state(struct buffer_head *bh)
 {
+#ifndef CONFIG_PREEMPT_RT_BASE
        bit_spin_lock(BH_State, &bh->b_state);
+#else
+       spin_lock(&bh->b_state_lock);
+#endif
 }
 
 static inline int jbd_trylock_bh_state(struct buffer_head *bh)
 {
+#ifndef CONFIG_PREEMPT_RT_BASE
        return bit_spin_trylock(BH_State, &bh->b_state);
+#else
+       return spin_trylock(&bh->b_state_lock);
+#endif
 }
 
 static inline int jbd_is_locked_bh_state(struct buffer_head *bh)
 {
+#ifndef CONFIG_PREEMPT_RT_BASE
        return bit_spin_is_locked(BH_State, &bh->b_state);
+#else
+       return spin_is_locked(&bh->b_state_lock);
+#endif
 }
 
 static inline void jbd_unlock_bh_state(struct buffer_head *bh)
 {
+#ifndef CONFIG_PREEMPT_RT_BASE
        bit_spin_unlock(BH_State, &bh->b_state);
+#else
+       spin_unlock(&bh->b_state_lock);
+#endif
 }
 
 static inline void jbd_lock_bh_journal_head(struct buffer_head *bh)
 {
+#ifndef CONFIG_PREEMPT_RT_BASE
        bit_spin_lock(BH_JournalHead, &bh->b_state);
+#else
+       spin_lock(&bh->b_journal_head_lock);
+#endif
 }
 
 static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
 {
+#ifndef CONFIG_PREEMPT_RT_BASE
        bit_spin_unlock(BH_JournalHead, &bh->b_state);
+#else
+       spin_unlock(&bh->b_journal_head_lock);
+#endif
 }
 
 #define J_ASSERT(assert)       BUG_ON(!(assert))
diff --git a/include/linux/kdb.h b/include/linux/kdb.h
index a19bcf9e762e..897495386446 100644
--- a/include/linux/kdb.h
+++ b/include/linux/kdb.h
@@ -167,6 +167,7 @@ extern __printf(2, 0) int vkdb_printf(enum kdb_msgsrc src, const char *fmt,
 extern __printf(1, 2) int kdb_printf(const char *, ...);
 typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...);
 
+#define in_kdb_printk()        (kdb_trap_printk)
 extern void kdb_init(int level);
 
 /* Access to kdb specific polling devices */
@@ -201,6 +202,7 @@ extern int kdb_register_flags(char *, kdb_func_t, char *, char *,
 extern int kdb_unregister(char *);
 #else /* ! CONFIG_KGDB_KDB */
 static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; }
+#define in_kdb_printk() (0)
 static inline void kdb_init(int level) {}
 static inline int kdb_register(char *cmd, kdb_func_t func, char *usage,
                               char *help, short minlen) { return 0; }
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 50220cab738c..d68f639f7330 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -188,6 +188,9 @@ extern int _cond_resched(void);
  */
 # define might_sleep() \
        do { __might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
+
+# define might_sleep_no_state_check() \
+       do { ___might_sleep(__FILE__, __LINE__, 0); might_resched(); } while (0)
 # define sched_annotate_sleep()        (current->task_state_change = 0)
 #else
   static inline void ___might_sleep(const char *file, int line,
@@ -195,6 +198,7 @@ extern int _cond_resched(void);
   static inline void __might_sleep(const char *file, int line,
                                   int preempt_offset) { }
 # define might_sleep() do { might_resched(); } while (0)
+# define might_sleep_no_state_check() do { might_resched(); } while (0)
 # define sched_annotate_sleep() do { } while (0)
 #endif
 
@@ -255,6 +259,7 @@ extern long (*panic_blink)(int state);
 __printf(1, 2)
 void panic(const char *fmt, ...)
        __noreturn __cold;
+void nmi_panic(struct pt_regs *regs, const char *msg);
 extern void oops_enter(void);
 extern void oops_exit(void);
 void print_oops_end_marker(void);
@@ -447,6 +452,14 @@ extern int sysctl_panic_on_stackoverflow;
 
 extern bool crash_kexec_post_notifiers;
 
+/*
+ * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It
+ * holds a CPU number which is executing panic() currently. A value of
+ * PANIC_CPU_INVALID means no CPU has entered panic() or crash_kexec().
+ */
+extern atomic_t panic_cpu;
+#define PANIC_CPU_INVALID      -1
+
 /*
  * Only to be used by arch init code. If the user over-wrote the default
  * CONFIG_PANIC_TIMEOUT, honor it.
@@ -475,6 +488,7 @@ extern enum system_states {
        SYSTEM_HALT,
        SYSTEM_POWER_OFF,
        SYSTEM_RESTART,
+       SYSTEM_SUSPEND,
 } system_state;
 
 #define TAINT_PROPRIETARY_MODULE       0
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index d7ce4e3280db..0b6d392b38e7 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -25,6 +25,7 @@
 #include <linux/irqflags.h>
 #include <linux/context_tracking.h>
 #include <linux/irqbypass.h>
+#include <linux/swait.h>
 #include <asm/signal.h>
 
 #include <linux/kvm.h>
@@ -243,7 +244,7 @@ struct kvm_vcpu {
        int fpu_active;
        int guest_fpu_loaded, guest_xcr0_loaded;
        unsigned char fpu_counter;
-       wait_queue_head_t wq;
+       struct swait_queue_head wq;
        struct pid *pid;
        int sigset_active;
        sigset_t sigset;
@@ -794,7 +795,7 @@ static inline bool kvm_arch_has_assigned_device(struct kvm *kvm)
 }
 #endif
 
-static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
+static inline struct swait_queue_head *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
 {
 #ifdef __KVM_HAVE_ARCH_WQP
        return vcpu->arch.wqp;
diff --git a/include/linux/lglock.h b/include/linux/lglock.h
index c92ebd100d9b..6f035f635d0e 100644
--- a/include/linux/lglock.h
+++ b/include/linux/lglock.h
@@ -34,13 +34,30 @@
 #endif
 
 struct lglock {
+#ifdef CONFIG_PREEMPT_RT_FULL
+       struct rt_mutex __percpu *lock;
+#else
        arch_spinlock_t __percpu *lock;
+#endif
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
        struct lock_class_key lock_key;
        struct lockdep_map    lock_dep_map;
 #endif
 };
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+# define DEFINE_LGLOCK(name)                                           \
+       static DEFINE_PER_CPU(struct rt_mutex, name ## _lock)           \
+       = __RT_MUTEX_INITIALIZER( name ## _lock);                       \
+       struct lglock name = { .lock = &name ## _lock }
+
+# define DEFINE_STATIC_LGLOCK(name)                                    \
+       static DEFINE_PER_CPU(struct rt_mutex, name ## _lock)           \
+       = __RT_MUTEX_INITIALIZER( name ## _lock);                       \
+       static struct lglock name = { .lock = &name ## _lock }
+
+#else
+
 #define DEFINE_LGLOCK(name)                                            \
        static DEFINE_PER_CPU(arch_spinlock_t, name ## _lock)           \
        = __ARCH_SPIN_LOCK_UNLOCKED;                                    \
@@ -50,6 +67,7 @@ struct lglock {
        static DEFINE_PER_CPU(arch_spinlock_t, name ## _lock)           \
        = __ARCH_SPIN_LOCK_UNLOCKED;                                    \
        static struct lglock name = { .lock = &name ## _lock }
+#endif
 
 void lg_lock_init(struct lglock *lg, char *name);
 
@@ -64,6 +82,12 @@ void lg_double_unlock(struct lglock *lg, int cpu1, int cpu2);
 void lg_global_lock(struct lglock *lg);
 void lg_global_unlock(struct lglock *lg);
 
+#ifndef CONFIG_PREEMPT_RT_FULL
+#define lg_global_trylock_relax(name)  lg_global_lock(name)
+#else
+void lg_global_trylock_relax(struct lglock *lg);
+#endif
+
 #else
 /* When !CONFIG_SMP, map lglock to spinlock */
 #define lglock spinlock
diff --git a/include/linux/list_bl.h b/include/linux/list_bl.h
index 8132214e8efd..89ffaa7bd342 100644
--- a/include/linux/list_bl.h
+++ b/include/linux/list_bl.h
@@ -2,6 +2,7 @@
 #define _LINUX_LIST_BL_H
 
 #include <linux/list.h>
+#include <linux/spinlock.h>
 #include <linux/bit_spinlock.h>
 
 /*
@@ -32,13 +33,24 @@
 
 struct hlist_bl_head {
        struct hlist_bl_node *first;
+#ifdef CONFIG_PREEMPT_RT_BASE
+       raw_spinlock_t lock;
+#endif
 };
 
 struct hlist_bl_node {
        struct hlist_bl_node *next, **pprev;
 };
-#define INIT_HLIST_BL_HEAD(ptr) \
-       ((ptr)->first = NULL)
+
+#ifdef CONFIG_PREEMPT_RT_BASE
+#define INIT_HLIST_BL_HEAD(h)          \
+do {                                   \
+       (h)->first = NULL;              \
+       raw_spin_lock_init(&(h)->lock); \
+} while (0)
+#else
+#define INIT_HLIST_BL_HEAD(h) (h)->first = NULL
+#endif
 
 static inline void INIT_HLIST_BL_NODE(struct hlist_bl_node *h)
 {
@@ -118,12 +130,26 @@ static inline void hlist_bl_del_init(struct hlist_bl_node *n)
 
 static inline void hlist_bl_lock(struct hlist_bl_head *b)
 {
+#ifndef CONFIG_PREEMPT_RT_BASE
        bit_spin_lock(0, (unsigned long *)b);
+#else
+       raw_spin_lock(&b->lock);
+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
+       __set_bit(0, (unsigned long *)b);
+#endif
+#endif
 }
 
 static inline void hlist_bl_unlock(struct hlist_bl_head *b)
 {
+#ifndef CONFIG_PREEMPT_RT_BASE
        __bit_spin_unlock(0, (unsigned long *)b);
+#else
+#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
+       __clear_bit(0, (unsigned long *)b);
+#endif
+       raw_spin_unlock(&b->lock);
+#endif
 }
 
 static inline bool hlist_bl_is_locked(struct hlist_bl_head *b)
diff --git a/include/linux/locallock.h b/include/linux/locallock.h
new file mode 100644
index 000000000000..0baaf28dc4ee
--- /dev/null
+++ b/include/linux/locallock.h
@@ -0,0 +1,285 @@
+#ifndef _LINUX_LOCALLOCK_H
+#define _LINUX_LOCALLOCK_H
+
+#include <linux/percpu.h>
+#include <linux/spinlock.h>
+
+#ifdef CONFIG_PREEMPT_RT_BASE
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+# define LL_WARN(cond) WARN_ON(cond)
+#else
+# define LL_WARN(cond) do { } while (0)
+#endif
+
+/*
+ * per cpu lock based substitute for local_irq_*()
+ */
+struct local_irq_lock {
+       spinlock_t              lock;
+       struct task_struct      *owner;
+       int                     nestcnt;
+       unsigned long           flags;
+};
+
+#define DEFINE_LOCAL_IRQ_LOCK(lvar)                                    \
+       DEFINE_PER_CPU(struct local_irq_lock, lvar) = {                 \
+               .lock = __SPIN_LOCK_UNLOCKED((lvar).lock) }
+
+#define DECLARE_LOCAL_IRQ_LOCK(lvar)                                   \
+       DECLARE_PER_CPU(struct local_irq_lock, lvar)
+
+#define local_irq_lock_init(lvar)                                      \
+       do {                                                            \
+               int __cpu;                                              \
+               for_each_possible_cpu(__cpu)                            \
+                       spin_lock_init(&per_cpu(lvar, __cpu).lock);     \
+       } while (0)
+
+/*
+ * spin_lock|trylock|unlock_local flavour that does not migrate disable
+ * used for __local_lock|trylock|unlock where get_local_var/put_local_var
+ * already takes care of the migrate_disable/enable
+ * for CONFIG_PREEMPT_BASE map to the normal spin_* calls.
+ */
+#ifdef CONFIG_PREEMPT_RT_FULL
+# define spin_lock_local(lock)                 rt_spin_lock__no_mg(lock)
+# define spin_trylock_local(lock)              rt_spin_trylock__no_mg(lock)
+# define spin_unlock_local(lock)               rt_spin_unlock__no_mg(lock)
+#else
+# define spin_lock_local(lock)                 spin_lock(lock)
+# define spin_trylock_local(lock)              spin_trylock(lock)
+# define spin_unlock_local(lock)               spin_unlock(lock)
+#endif
+
+static inline void __local_lock(struct local_irq_lock *lv)
+{
+       if (lv->owner != current) {
+               spin_lock_local(&lv->lock);
+               LL_WARN(lv->owner);
+               LL_WARN(lv->nestcnt);
+               lv->owner = current;
+       }
+       lv->nestcnt++;
+}
+
+#define local_lock(lvar)                                       \
+       do { __local_lock(&get_local_var(lvar)); } while (0)
+
+#define local_lock_on(lvar, cpu)                               \
+       do { __local_lock(&per_cpu(lvar, cpu)); } while (0)
+
+static inline int __local_trylock(struct local_irq_lock *lv)
+{
+       if (lv->owner != current && spin_trylock_local(&lv->lock)) {
+               LL_WARN(lv->owner);
+               LL_WARN(lv->nestcnt);
+               lv->owner = current;
+               lv->nestcnt = 1;
+               return 1;
+       } else if (lv->owner == current) {
+               lv->nestcnt++;
+               return 1;
+       }
+       return 0;
+}
+
+#define local_trylock(lvar)                                            \
+       ({                                                              \
+               int __locked;                                           \
+               __locked = __local_trylock(&get_local_var(lvar));       \
+               if (!__locked)                                          \
+                       put_local_var(lvar);                            \
+               __locked;                                               \
+       })
+
+static inline void __local_unlock(struct local_irq_lock *lv)
+{
+       LL_WARN(lv->nestcnt == 0);
+       LL_WARN(lv->owner != current);
+       if (--lv->nestcnt)
+               return;
+
+       lv->owner = NULL;
+       spin_unlock_local(&lv->lock);
+}
+
+#define local_unlock(lvar)                                     \
+       do {                                                    \
+               __local_unlock(this_cpu_ptr(&lvar));            \
+               put_local_var(lvar);                            \
+       } while (0)
+
+#define local_unlock_on(lvar, cpu)                       \
+       do { __local_unlock(&per_cpu(lvar, cpu)); } while (0)
+
+static inline void __local_lock_irq(struct local_irq_lock *lv)
+{
+       spin_lock_irqsave(&lv->lock, lv->flags);
+       LL_WARN(lv->owner);
+       LL_WARN(lv->nestcnt);
+       lv->owner = current;
+       lv->nestcnt = 1;
+}
+
+#define local_lock_irq(lvar)                                           \
+       do { __local_lock_irq(&get_local_var(lvar)); } while (0)
+
+#define local_lock_irq_on(lvar, cpu)                                   \
+       do { __local_lock_irq(&per_cpu(lvar, cpu)); } while (0)
+
+static inline void __local_unlock_irq(struct local_irq_lock *lv)
+{
+       LL_WARN(!lv->nestcnt);
+       LL_WARN(lv->owner != current);
+       lv->owner = NULL;
+       lv->nestcnt = 0;
+       spin_unlock_irq(&lv->lock);
+}
+
+#define local_unlock_irq(lvar)                                         \
+       do {                                                            \
+               __local_unlock_irq(this_cpu_ptr(&lvar));                \
+               put_local_var(lvar);                                    \
+       } while (0)
+
+#define local_unlock_irq_on(lvar, cpu)                                 \
+       do {                                                            \
+               __local_unlock_irq(&per_cpu(lvar, cpu));                \
+       } while (0)
+
+static inline int __local_lock_irqsave(struct local_irq_lock *lv)
+{
+       if (lv->owner != current) {
+               __local_lock_irq(lv);
+               return 0;
+       } else {
+               lv->nestcnt++;
+               return 1;
+       }
+}
+
+#define local_lock_irqsave(lvar, _flags)                               \
+       do {                                                            \
+               if (__local_lock_irqsave(&get_local_var(lvar)))         \
+                       put_local_var(lvar);                            \
+               _flags = __this_cpu_read(lvar.flags);                   \
+       } while (0)
+
+#define local_lock_irqsave_on(lvar, _flags, cpu)                       \
+       do {                                                            \
+               __local_lock_irqsave(&per_cpu(lvar, cpu));              \
+               _flags = per_cpu(lvar, cpu).flags;                      \
+       } while (0)
+
+static inline int __local_unlock_irqrestore(struct local_irq_lock *lv,
+                                           unsigned long flags)
+{
+       LL_WARN(!lv->nestcnt);
+       LL_WARN(lv->owner != current);
+       if (--lv->nestcnt)
+               return 0;
+
+       lv->owner = NULL;
+       spin_unlock_irqrestore(&lv->lock, lv->flags);
+       return 1;
+}
+
+#define local_unlock_irqrestore(lvar, flags)                           \
+       do {                                                            \
+               if (__local_unlock_irqrestore(this_cpu_ptr(&lvar), flags)) \
+                       put_local_var(lvar);                            \
+       } while (0)
+
+#define local_unlock_irqrestore_on(lvar, flags, cpu)                   \
+       do {                                                            \
+               __local_unlock_irqrestore(&per_cpu(lvar, cpu), flags);  \
+       } while (0)
+
+#define local_spin_trylock_irq(lvar, lock)                             \
+       ({                                                              \
+               int __locked;                                           \
+               local_lock_irq(lvar);                                   \
+               __locked = spin_trylock(lock);                          \
+               if (!__locked)                                          \
+                       local_unlock_irq(lvar);                         \
+               __locked;                                               \
+       })
+
+#define local_spin_lock_irq(lvar, lock)                                        \
+       do {                                                            \
+               local_lock_irq(lvar);                                   \
+               spin_lock(lock);                                        \
+       } while (0)
+
+#define local_spin_unlock_irq(lvar, lock)                              \
+       do {                                                            \
+               spin_unlock(lock);                                      \
+               local_unlock_irq(lvar);                                 \
+       } while (0)
+
+#define local_spin_lock_irqsave(lvar, lock, flags)                     \
+       do {                                                            \
+               local_lock_irqsave(lvar, flags);                        \
+               spin_lock(lock);                                        \
+       } while (0)
+
+#define local_spin_unlock_irqrestore(lvar, lock, flags)                        \
+       do {                                                            \
+               spin_unlock(lock);                                      \
+               local_unlock_irqrestore(lvar, flags);                   \
+       } while (0)
+
+#define get_locked_var(lvar, var)                                      \
+       (*({                                                            \
+               local_lock(lvar);                                       \
+               this_cpu_ptr(&var);                                     \
+       }))
+
+#define put_locked_var(lvar, var)      local_unlock(lvar);
+
+#define local_lock_cpu(lvar)                                           \
+       ({                                                              \
+               local_lock(lvar);                                       \
+               smp_processor_id();                                     \
+       })
+
+#define local_unlock_cpu(lvar)                 local_unlock(lvar)
+
+#else /* PREEMPT_RT_BASE */
+
+#define DEFINE_LOCAL_IRQ_LOCK(lvar)            __typeof__(const int) lvar
+#define DECLARE_LOCAL_IRQ_LOCK(lvar)           extern __typeof__(const int) lvar
+
+static inline void local_irq_lock_init(int lvar) { }
+
+#define local_trylock(lvar)                                    \
+       ({                                                      \
+               preempt_disable();                              \
+               1;                                              \
+       })
+
+#define local_lock(lvar)                       preempt_disable()
+#define local_unlock(lvar)                     preempt_enable()
+#define local_lock_irq(lvar)                   local_irq_disable()
+#define local_unlock_irq(lvar)                 local_irq_enable()
+#define local_lock_irqsave(lvar, flags)                local_irq_save(flags)
+#define local_unlock_irqrestore(lvar, flags)   local_irq_restore(flags)
+
+#define local_spin_trylock_irq(lvar, lock)     spin_trylock_irq(lock)
+#define local_spin_lock_irq(lvar, lock)                spin_lock_irq(lock)
+#define local_spin_unlock_irq(lvar, lock)      spin_unlock_irq(lock)
+#define local_spin_lock_irqsave(lvar, lock, flags)     \
+       spin_lock_irqsave(lock, flags)
+#define local_spin_unlock_irqrestore(lvar, lock, flags)        \
+       spin_unlock_irqrestore(lock, flags)
+
+#define get_locked_var(lvar, var)              get_cpu_var(var)
+#define put_locked_var(lvar, var)              put_cpu_var(var)
+
+#define local_lock_cpu(lvar)                   get_cpu()
+#define local_unlock_cpu(lvar)                 put_cpu()
+
+#endif
+
+#endif
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 36f4695aa604..2be9cca8be08 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -11,6 +11,7 @@
 #include <linux/completion.h>
 #include <linux/cpumask.h>
 #include <linux/uprobes.h>
+#include <linux/rcupdate.h>
 #include <linux/page-flags-layout.h>
 #include <asm/page.h>
 #include <asm/mmu.h>
@@ -509,6 +510,9 @@ struct mm_struct {
        bool tlb_flush_batched;
 #endif
        struct uprobes_state uprobes_state;
+#ifdef CONFIG_PREEMPT_RT_BASE
+       struct rcu_head delayed_drop;
+#endif
 #ifdef CONFIG_X86_INTEL_MPX
        /* address of the bounds directory */
        void __user *bd_addr;
diff --git a/include/linux/module.h b/include/linux/module.h
index b229a9961d02..5fea847cf95c 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -500,6 +500,7 @@ static inline int module_is_live(struct module *mod)
 struct module *__module_text_address(unsigned long addr);
 struct module *__module_address(unsigned long addr);
 bool is_module_address(unsigned long addr);
+bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr);
 bool is_module_percpu_address(unsigned long addr);
 bool is_module_text_address(unsigned long addr);
 
@@ -665,6 +666,11 @@ static inline bool is_module_percpu_address(unsigned long addr)
        return false;
 }
 
+static inline bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
+{
+       return false;
+}
+
 static inline bool is_module_text_address(unsigned long addr)
 {
        return false;
diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 2cb7531e7d7a..b3fdfc820216 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -19,6 +19,17 @@
 #include <asm/processor.h>
 #include <linux/osq_lock.h>
 
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
+       , .dep_map = { .name = #lockname }
+#else
+# define __DEP_MAP_MUTEX_INITIALIZER(lockname)
+#endif
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+# include <linux/mutex_rt.h>
+#else
+
 /*
  * Simple, straightforward mutexes with strict semantics:
  *
@@ -99,13 +110,6 @@ do {                                                        \
 static inline void mutex_destroy(struct mutex *lock) {}
 #endif
 
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-# define __DEP_MAP_MUTEX_INITIALIZER(lockname) \
-               , .dep_map = { .name = #lockname }
-#else
-# define __DEP_MAP_MUTEX_INITIALIZER(lockname)
-#endif
-
 #define __MUTEX_INITIALIZER(lockname) \
                { .count = ATOMIC_INIT(1) \
                , .wait_lock = __SPIN_LOCK_UNLOCKED(lockname.wait_lock) \
@@ -173,6 +177,8 @@ extern int __must_check mutex_lock_killable(struct mutex *lock);
 extern int mutex_trylock(struct mutex *lock);
 extern void mutex_unlock(struct mutex *lock);
 
+#endif /* !PREEMPT_RT_FULL */
+
 extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock);
 
 #endif /* __LINUX_MUTEX_H */
diff --git a/include/linux/mutex_rt.h b/include/linux/mutex_rt.h
new file mode 100644
index 000000000000..e0284edec655
--- /dev/null
+++ b/include/linux/mutex_rt.h
@@ -0,0 +1,89 @@
+#ifndef __LINUX_MUTEX_RT_H
+#define __LINUX_MUTEX_RT_H
+
+#ifndef __LINUX_MUTEX_H
+#error "Please include mutex.h"
+#endif
+
+#include <linux/rtmutex.h>
+
+/* FIXME: Just for __lockfunc */
+#include <linux/spinlock.h>
+
+struct mutex {
+       struct rt_mutex         lock;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+       struct lockdep_map      dep_map;
+#endif
+};
+
+#define __MUTEX_INITIALIZER(mutexname)                                 \
+       {                                                               \
+               .lock = __RT_MUTEX_INITIALIZER(mutexname.lock)          \
+               __DEP_MAP_MUTEX_INITIALIZER(mutexname)                  \
+       }
+
+#define DEFINE_MUTEX(mutexname)                                                \
+       struct mutex mutexname = __MUTEX_INITIALIZER(mutexname)
+
+extern void __mutex_do_init(struct mutex *lock, const char *name, struct lock_class_key *key);
+extern void __lockfunc _mutex_lock(struct mutex *lock);
+extern int __lockfunc _mutex_lock_interruptible(struct mutex *lock);
+extern int __lockfunc _mutex_lock_killable(struct mutex *lock);
+extern void __lockfunc _mutex_lock_nested(struct mutex *lock, int subclass);
+extern void __lockfunc _mutex_lock_nest_lock(struct mutex *lock, struct lockdep_map *nest_lock);
+extern int __lockfunc _mutex_lock_interruptible_nested(struct mutex *lock, int subclass);
+extern int __lockfunc _mutex_lock_killable_nested(struct mutex *lock, int subclass);
+extern int __lockfunc _mutex_trylock(struct mutex *lock);
+extern void __lockfunc _mutex_unlock(struct mutex *lock);
+
+#define mutex_is_locked(l)             rt_mutex_is_locked(&(l)->lock)
+#define mutex_lock(l)                  _mutex_lock(l)
+#define mutex_lock_interruptible(l)    _mutex_lock_interruptible(l)
+#define mutex_lock_killable(l)         _mutex_lock_killable(l)
+#define mutex_trylock(l)               _mutex_trylock(l)
+#define mutex_unlock(l)                        _mutex_unlock(l)
+
+#ifdef CONFIG_DEBUG_MUTEXES
+#define mutex_destroy(l)               rt_mutex_destroy(&(l)->lock)
+#else
+static inline void mutex_destroy(struct mutex *lock) {}
+#endif
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define mutex_lock_nested(l, s)       _mutex_lock_nested(l, s)
+# define mutex_lock_interruptible_nested(l, s) \
+                                       _mutex_lock_interruptible_nested(l, s)
+# define mutex_lock_killable_nested(l, s) \
+                                       _mutex_lock_killable_nested(l, s)
+
+# define mutex_lock_nest_lock(lock, nest_lock)                         \
+do {                                                                   \
+       typecheck(struct lockdep_map *, &(nest_lock)->dep_map);         \
+       _mutex_lock_nest_lock(lock, &(nest_lock)->dep_map);             \
+} while (0)
+
+#else
+# define mutex_lock_nested(l, s)       _mutex_lock(l)
+# define mutex_lock_interruptible_nested(l, s) \
+                                       _mutex_lock_interruptible(l)
+# define mutex_lock_killable_nested(l, s) \
+                                       _mutex_lock_killable(l)
+# define mutex_lock_nest_lock(lock, nest_lock) mutex_lock(lock)
+#endif
+
+# define mutex_init(mutex)                             \
+do {                                                   \
+       static struct lock_class_key __key;             \
+                                                       \
+       rt_mutex_init(&(mutex)->lock);                  \
+       __mutex_do_init((mutex), #mutex, &__key);       \
+} while (0)
+
+# define __mutex_init(mutex, name, key)                        \
+do {                                                   \
+       rt_mutex_init(&(mutex)->lock);                  \
+       __mutex_do_init((mutex), name, key);            \
+} while (0)
+
+#endif
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index fc54049e8286..5a5588a57cad 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -390,7 +390,19 @@ typedef enum rx_handler_result rx_handler_result_t;
 typedef rx_handler_result_t rx_handler_func_t(struct sk_buff **pskb);
 
 void __napi_schedule(struct napi_struct *n);
+
+/*
+ * When PREEMPT_RT_FULL is defined, all device interrupt handlers
+ * run as threads, and they can also be preempted (without PREEMPT_RT
+ * interrupt threads can not be preempted). Which means that calling
+ * __napi_schedule_irqoff() from an interrupt handler can be preempted
+ * and can corrupt the napi->poll_list.
+ */
+#ifdef CONFIG_PREEMPT_RT_FULL
+#define __napi_schedule_irqoff(n) __napi_schedule(n)
+#else
 void __napi_schedule_irqoff(struct napi_struct *n);
+#endif
 
 static inline bool napi_disable_pending(struct napi_struct *n)
 {
@@ -2288,11 +2300,20 @@ void netdev_freemem(struct net_device *dev);
 void synchronize_net(void);
 int init_dummy_netdev(struct net_device *dev);
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+static inline int dev_recursion_level(void)
+{
+       return current->xmit_recursion;
+}
+
+#else
+
 DECLARE_PER_CPU(int, xmit_recursion);
 static inline int dev_recursion_level(void)
 {
        return this_cpu_read(xmit_recursion);
 }
+#endif
 
 struct net_device *dev_get_by_index(struct net *net, int ifindex);
 struct net_device *__dev_get_by_index(struct net *net, int ifindex);
@@ -2610,6 +2631,7 @@ struct softnet_data {
        unsigned int            dropped;
        struct sk_buff_head     input_pkt_queue;
        struct napi_struct      backlog;
+       struct sk_buff_head     tofree_queue;
 
 };
 
diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index 04078e8a4803..a61c9609e32f 100644
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -4,6 +4,7 @@
 
 #include <linux/netdevice.h>
 #include <linux/static_key.h>
+#include <linux/locallock.h>
 #include <uapi/linux/netfilter/x_tables.h>
 
 /**
@@ -289,6 +290,8 @@ void xt_free_table_info(struct xt_table_info *info);
  */
 DECLARE_PER_CPU(seqcount_t, xt_recseq);
 
+DECLARE_LOCAL_IRQ_LOCK(xt_write_lock);
+
 /* xt_tee_enabled - true if x_tables needs to handle reentrancy
  *
  * Enabled if current ip(6)tables ruleset has at least one -j TEE rule.
@@ -309,6 +312,9 @@ static inline unsigned int xt_write_recseq_begin(void)
 {
        unsigned int addend;
 
+       /* RT protection */
+       local_lock(xt_write_lock);
+
        /*
         * Low order bit of sequence is set if we already
         * called xt_write_recseq_begin().
@@ -339,6 +345,7 @@ static inline void xt_write_recseq_end(unsigned int addend)
        /* this is kind of a write_seqcount_end(), but addend is 0 or 1 */
        smp_wmb();
        __this_cpu_add(xt_recseq.sequence, addend);
+       local_unlock(xt_write_lock);
 }
 
 /*
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index d14a4c362465..2e4414a0c1c4 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -6,7 +6,7 @@
  *
  *                             Alan Cox <Alan.Cox@linux.org>
  */
- 
+
 #ifndef _LINUX_NOTIFIER_H
 #define _LINUX_NOTIFIER_H
 #include <linux/errno.h>
@@ -42,9 +42,7 @@
  * in srcu_notifier_call_chain(): no cache bounces and no memory barriers.
  * As compensation, srcu_notifier_chain_unregister() is rather expensive.
  * SRCU notifier chains should be used when the chain will be called very
- * often but notifier_blocks will seldom be removed.  Also, SRCU notifier
- * chains are slightly more difficult to use because they require special
- * runtime initialization.
+ * often but notifier_blocks will seldom be removed.
  */
 
 typedef        int (*notifier_fn_t)(struct notifier_block *nb,
@@ -88,7 +86,7 @@ struct srcu_notifier_head {
                (name)->head = NULL;            \
        } while (0)
 
-/* srcu_notifier_heads must be initialized and cleaned up dynamically */
+/* srcu_notifier_heads must be cleaned up dynamically */
 extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
 #define srcu_cleanup_notifier_head(name)       \
                cleanup_srcu_struct(&(name)->srcu);
@@ -101,7 +99,13 @@ extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
                .head = NULL }
 #define RAW_NOTIFIER_INIT(name)        {                               \
                .head = NULL }
-/* srcu_notifier_heads cannot be initialized statically */
+
+#define SRCU_NOTIFIER_INIT(name, pcpu)                         \
+       {                                                       \
+               .mutex = __MUTEX_INITIALIZER(name.mutex),       \
+               .head = NULL,                                   \
+               .srcu = __SRCU_STRUCT_INIT(name.srcu, pcpu),    \
+       }
 
 #define ATOMIC_NOTIFIER_HEAD(name)                             \
        struct atomic_notifier_head name =                      \
@@ -113,6 +117,18 @@ extern void srcu_init_notifier_head(struct srcu_notifier_head *nh);
        struct raw_notifier_head name =                         \
                RAW_NOTIFIER_INIT(name)
 
+#define _SRCU_NOTIFIER_HEAD(name, mod)                         \
+       static DEFINE_PER_CPU(struct srcu_struct_array,         \
+                       name##_head_srcu_array);                \
+       mod struct srcu_notifier_head name =                    \
+                       SRCU_NOTIFIER_INIT(name, name##_head_srcu_array)
+
+#define SRCU_NOTIFIER_HEAD(name)                               \
+       _SRCU_NOTIFIER_HEAD(name, )
+
+#define SRCU_NOTIFIER_HEAD_STATIC(name)                                \
+       _SRCU_NOTIFIER_HEAD(name, static)
+
 #ifdef __KERNEL__
 
 extern int atomic_notifier_chain_register(struct atomic_notifier_head *nh,
@@ -182,12 +198,12 @@ static inline int notifier_to_errno(int ret)
 
 /*
  *     Declared notifiers so far. I can imagine quite a few more chains
- *     over time (eg laptop power reset chains, reboot chain (to clean 
+ *     over time (eg laptop power reset chains, reboot chain (to clean
  *     device units up), device [un]mount chain, module load/unload chain,
- *     low memory chain, screenblank chain (for plug in modular screenblankers) 
+ *     low memory chain, screenblank chain (for plug in modular screenblankers)
  *     VC switch chains (for loadable kernel svgalib VC switch helpers) etc...
  */
- 
+
 /* CPU notfiers are defined in include/linux/cpu.h. */
 
 /* netdevice notifiers are defined in include/linux/netdevice.h */
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index caebf2a758dc..4ecc057b6e27 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -24,6 +24,35 @@
         PERCPU_MODULE_RESERVE)
 #endif
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+
+#define get_local_var(var) (*({                \
+              migrate_disable();       \
+              this_cpu_ptr(&var);      }))
+
+#define put_local_var(var) do {        \
+       (void)&(var);           \
+       migrate_enable();       \
+} while (0)
+
+# define get_local_ptr(var) ({         \
+               migrate_disable();      \
+               this_cpu_ptr(var);      })
+
+# define put_local_ptr(var) do {       \
+       (void)(var);                    \
+       migrate_enable();               \
+} while (0)
+
+#else
+
+#define get_local_var(var)     get_cpu_var(var)
+#define put_local_var(var)     put_cpu_var(var)
+#define get_local_ptr(var)     get_cpu_ptr(var)
+#define put_local_ptr(var)     put_cpu_ptr(var)
+
+#endif
+
 /* minimum unit size, also is the maximum supported allocation size */
 #define PCPU_MIN_UNIT_SIZE             PFN_ALIGN(32 << 10)
 
@@ -116,6 +145,7 @@ extern int __init pcpu_page_first_chunk(size_t reserved_size,
 #endif
 
 extern void __percpu *__alloc_reserved_percpu(size_t size, size_t align);
+extern bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr);
 extern bool is_kernel_percpu_address(unsigned long addr);
 
 #if !defined(CONFIG_SMP) || !defined(CONFIG_HAVE_SETUP_PER_CPU_AREA)
diff --git a/include/linux/pid.h b/include/linux/pid.h
index 97b745ddece5..01a5460a0c85 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -2,6 +2,7 @@
 #define _LINUX_PID_H
 
 #include <linux/rcupdate.h>
+#include <linux/atomic.h>
 
 enum pid_type
 {
diff --git a/include/linux/preempt.h b/include/linux/preempt.h
index 7eeceac52dea..f97c54265904 100644
--- a/include/linux/preempt.h
+++ b/include/linux/preempt.h
@@ -50,7 +50,11 @@
 #define HARDIRQ_OFFSET (1UL << HARDIRQ_SHIFT)
 #define NMI_OFFSET     (1UL << NMI_SHIFT)
 
-#define SOFTIRQ_DISABLE_OFFSET (2 * SOFTIRQ_OFFSET)
+#ifndef CONFIG_PREEMPT_RT_FULL
+# define SOFTIRQ_DISABLE_OFFSET                (2 * SOFTIRQ_OFFSET)
+#else
+# define SOFTIRQ_DISABLE_OFFSET                (0)
+#endif
 
 /* We use the MSB mostly because its available */
 #define PREEMPT_NEED_RESCHED   0x80000000
@@ -59,9 +63,15 @@
 #include <asm/preempt.h>
 
 #define hardirq_count()        (preempt_count() & HARDIRQ_MASK)
-#define softirq_count()        (preempt_count() & SOFTIRQ_MASK)
 #define irq_count()    (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK \
                                 | NMI_MASK))
+#ifndef CONFIG_PREEMPT_RT_FULL
+# define softirq_count()       (preempt_count() & SOFTIRQ_MASK)
+# define in_serving_softirq()  (softirq_count() & SOFTIRQ_OFFSET)
+#else
+# define softirq_count()       (0UL)
+extern int in_serving_softirq(void);
+#endif
 
 /*
  * Are we doing bottom half or hardware interrupt processing?
@@ -79,7 +89,6 @@
 #define in_irq()               (hardirq_count())
 #define in_softirq()           (softirq_count())
 #define in_interrupt()         (irq_count())
-#define in_serving_softirq()   (softirq_count() & SOFTIRQ_OFFSET)
 #define in_nmi()               (preempt_count() & NMI_MASK)
 #define in_task()              (!(preempt_count() & \
                                   (NMI_MASK | HARDIRQ_MASK | SOFTIRQ_OFFSET)))
@@ -96,7 +105,11 @@
 /*
  * The preempt_count offset after spin_lock()
  */
+#if !defined(CONFIG_PREEMPT_RT_FULL)
 #define PREEMPT_LOCK_OFFSET    PREEMPT_DISABLE_OFFSET
+#else
+#define PREEMPT_LOCK_OFFSET    0
+#endif
 
 /*
  * The preempt_count offset needed for things like:
@@ -145,6 +158,20 @@ extern void preempt_count_sub(int val);
 #define preempt_count_inc() preempt_count_add(1)
 #define preempt_count_dec() preempt_count_sub(1)
 
+#ifdef CONFIG_PREEMPT_LAZY
+#define add_preempt_lazy_count(val)    do { preempt_lazy_count() += (val); } while (0)
+#define sub_preempt_lazy_count(val)    do { preempt_lazy_count() -= (val); } while (0)
+#define inc_preempt_lazy_count()       add_preempt_lazy_count(1)
+#define dec_preempt_lazy_count()       sub_preempt_lazy_count(1)
+#define preempt_lazy_count()           (current_thread_info()->preempt_lazy_count)
+#else
+#define add_preempt_lazy_count(val)    do { } while (0)
+#define sub_preempt_lazy_count(val)    do { } while (0)
+#define inc_preempt_lazy_count()       do { } while (0)
+#define dec_preempt_lazy_count()       do { } while (0)
+#define preempt_lazy_count()           (0)
+#endif
+
 #ifdef CONFIG_PREEMPT_COUNT
 
 #define preempt_disable() \
@@ -153,13 +180,25 @@ do { \
        barrier(); \
 } while (0)
 
+#define preempt_lazy_disable() \
+do { \
+       inc_preempt_lazy_count(); \
+       barrier(); \
+} while (0)
+
 #define sched_preempt_enable_no_resched() \
 do { \
        barrier(); \
        preempt_count_dec(); \
 } while (0)
 
-#define preempt_enable_no_resched() sched_preempt_enable_no_resched()
+#ifdef CONFIG_PREEMPT_RT_BASE
+# define preempt_enable_no_resched() sched_preempt_enable_no_resched()
+# define preempt_check_resched_rt() preempt_check_resched()
+#else
+# define preempt_enable_no_resched() preempt_enable()
+# define preempt_check_resched_rt() barrier();
+#endif
 
 #define preemptible()  (preempt_count() == 0 && !irqs_disabled())
 
@@ -184,6 +223,13 @@ do { \
                __preempt_schedule(); \
 } while (0)
 
+#define preempt_lazy_enable() \
+do { \
+       dec_preempt_lazy_count(); \
+       barrier(); \
+       preempt_check_resched(); \
+} while (0)
+
 #else /* !CONFIG_PREEMPT */
 #define preempt_enable() \
 do { \
@@ -229,6 +275,7 @@ do { \
 #define preempt_disable_notrace()              barrier()
 #define preempt_enable_no_resched_notrace()    barrier()
 #define preempt_enable_notrace()               barrier()
+#define preempt_check_resched_rt()             barrier()
 #define preemptible()                          0
 
 #endif /* CONFIG_PREEMPT_COUNT */
@@ -249,10 +296,31 @@ do { \
 } while (0)
 #define preempt_fold_need_resched() \
 do { \
-       if (tif_need_resched()) \
+       if (tif_need_resched_now()) \
                set_preempt_need_resched(); \
 } while (0)
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+# define preempt_disable_rt()          preempt_disable()
+# define preempt_enable_rt()           preempt_enable()
+# define preempt_disable_nort()                barrier()
+# define preempt_enable_nort()         barrier()
+# ifdef CONFIG_SMP
+   extern void migrate_disable(void);
+   extern void migrate_enable(void);
+# else /* CONFIG_SMP */
+#  define migrate_disable()            barrier()
+#  define migrate_enable()             barrier()
+# endif /* CONFIG_SMP */
+#else
+# define preempt_disable_rt()          barrier()
+# define preempt_enable_rt()           barrier()
+# define preempt_disable_nort()                preempt_disable()
+# define preempt_enable_nort()         preempt_enable()
+# define migrate_disable()             preempt_disable()
+# define migrate_enable()              preempt_enable()
+#endif
+
 #ifdef CONFIG_PREEMPT_NOTIFIERS
 
 struct preempt_notifier;
diff --git a/include/linux/printk.h b/include/linux/printk.h
index 9729565c25ff..9cdca696b718 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -117,9 +117,11 @@ int no_printk(const char *fmt, ...)
 #ifdef CONFIG_EARLY_PRINTK
 extern asmlinkage __printf(1, 2)
 void early_printk(const char *fmt, ...);
+extern void printk_kill(void);
 #else
 static inline __printf(1, 2) __cold
 void early_printk(const char *s, ...) { }
+static inline void printk_kill(void) { }
 #endif
 
 typedef __printf(1, 0) int (*printk_func_t)(const char *fmt, va_list args);
diff --git a/include/linux/radix-tree.h b/include/linux/radix-tree.h
index 5d5174b59802..327dddaf4c8f 100644
--- a/include/linux/radix-tree.h
+++ b/include/linux/radix-tree.h
@@ -279,6 +279,8 @@ unsigned int radix_tree_gang_lookup_slot(struct radix_tree_root *root,
                        unsigned long first_index, unsigned int max_items);
 int radix_tree_preload(gfp_t gfp_mask);
 int radix_tree_maybe_preload(gfp_t gfp_mask);
+void radix_tree_preload_end(void);
+
 void radix_tree_init(void);
 void *radix_tree_tag_set(struct radix_tree_root *root,
                        unsigned long index, unsigned int tag);
@@ -301,11 +303,6 @@ unsigned long radix_tree_range_tag_if_tagged(struct radix_tree_root *root,
 int radix_tree_tagged(struct radix_tree_root *root, unsigned int tag);
 unsigned long radix_tree_locate_item(struct radix_tree_root *root, void *item);
 
-static inline void radix_tree_preload_end(void)
-{
-       preempt_enable();
-}
-
 /**
  * struct radix_tree_iter - radix tree iterator state
  *
diff --git a/include/linux/random.h b/include/linux/random.h
index 9c29122037f9..e7f2f8604918 100644
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -20,7 +20,7 @@ struct random_ready_callback {
 extern void add_device_randomness(const void *, unsigned int);
 extern void add_input_randomness(unsigned int type, unsigned int code,
                                 unsigned int value);
-extern void add_interrupt_randomness(int irq, int irq_flags);
+extern void add_interrupt_randomness(int irq, int irq_flags, __u64 ip);
 
 extern void get_random_bytes(void *buf, int nbytes);
 extern int add_random_ready_callback(struct random_ready_callback *rdy);
diff --git a/include/linux/rbtree.h b/include/linux/rbtree.h
index a5aa7ae671f4..24ddffd25492 100644
--- a/include/linux/rbtree.h
+++ b/include/linux/rbtree.h
@@ -31,7 +31,6 @@
 
 #include <linux/kernel.h>
 #include <linux/stddef.h>
-#include <linux/rcupdate.h>
 
 struct rb_node {
        unsigned long  __rb_parent_color;
@@ -86,14 +85,8 @@ static inline void rb_link_node(struct rb_node *node, struct rb_node *parent,
        *rb_link = node;
 }
 
-static inline void rb_link_node_rcu(struct rb_node *node, struct rb_node *parent,
-                                   struct rb_node **rb_link)
-{
-       node->__rb_parent_color = (unsigned long)parent;
-       node->rb_left = node->rb_right = NULL;
-
-       rcu_assign_pointer(*rb_link, node);
-}
+void rb_link_node_rcu(struct rb_node *node, struct rb_node *parent,
+                     struct rb_node **rb_link);
 
 #define rb_entry_safe(ptr, type, member) \
        ({ typeof(ptr) ____ptr = (ptr); \
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index a0189ba67fde..c2f5f955163d 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -169,6 +169,9 @@ void call_rcu(struct rcu_head *head,
 
 #endif /* #else #ifdef CONFIG_PREEMPT_RCU */
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+#define call_rcu_bh    call_rcu
+#else
 /**
  * call_rcu_bh() - Queue an RCU for invocation after a quicker grace period.
  * @head: structure to be used for queueing the RCU updates.
@@ -192,6 +195,7 @@ void call_rcu(struct rcu_head *head,
  */
 void call_rcu_bh(struct rcu_head *head,
                 rcu_callback_t func);
+#endif
 
 /**
  * call_rcu_sched() - Queue an RCU for invocation after sched grace period.
@@ -292,6 +296,11 @@ void synchronize_rcu(void);
  * types of kernel builds, the rcu_read_lock() nesting depth is unknowable.
  */
 #define rcu_preempt_depth() (current->rcu_read_lock_nesting)
+#ifndef CONFIG_PREEMPT_RT_FULL
+#define sched_rcu_preempt_depth()      rcu_preempt_depth()
+#else
+static inline int sched_rcu_preempt_depth(void) { return 0; }
+#endif
 
 #else /* #ifdef CONFIG_PREEMPT_RCU */
 
@@ -317,6 +326,8 @@ static inline int rcu_preempt_depth(void)
        return 0;
 }
 
+#define sched_rcu_preempt_depth()      rcu_preempt_depth()
+
 #endif /* #else #ifdef CONFIG_PREEMPT_RCU */
 
 /* Internal to kernel */
@@ -489,7 +500,14 @@ extern struct lockdep_map rcu_callback_map;
 int debug_lockdep_rcu_enabled(void);
 
 int rcu_read_lock_held(void);
+#ifdef CONFIG_PREEMPT_RT_FULL
+static inline int rcu_read_lock_bh_held(void)
+{
+       return rcu_read_lock_held();
+}
+#else
 int rcu_read_lock_bh_held(void);
+#endif
 
 /**
  * rcu_read_lock_sched_held() - might we be in RCU-sched read-side critical section?
@@ -937,10 +955,14 @@ static inline void rcu_read_unlock(void)
 static inline void rcu_read_lock_bh(void)
 {
        local_bh_disable();
+#ifdef CONFIG_PREEMPT_RT_FULL
+       rcu_read_lock();
+#else
        __acquire(RCU_BH);
        rcu_lock_acquire(&rcu_bh_lock_map);
        RCU_LOCKDEP_WARN(!rcu_is_watching(),
                         "rcu_read_lock_bh() used illegally while idle");
+#endif
 }
 
 /*
@@ -950,10 +972,14 @@ static inline void rcu_read_lock_bh(void)
  */
 static inline void rcu_read_unlock_bh(void)
 {
+#ifdef CONFIG_PREEMPT_RT_FULL
+       rcu_read_unlock();
+#else
        RCU_LOCKDEP_WARN(!rcu_is_watching(),
                         "rcu_read_unlock_bh() used illegally while idle");
        rcu_lock_release(&rcu_bh_lock_map);
        __release(RCU_BH);
+#endif
        local_bh_enable();
 }
 
diff --git a/include/linux/rcutree.h b/include/linux/rcutree.h
index 60d15a080d7c..436c9e62bfc6 100644
--- a/include/linux/rcutree.h
+++ b/include/linux/rcutree.h
@@ -44,7 +44,11 @@ static inline void rcu_virt_note_context_switch(int cpu)
        rcu_note_context_switch();
 }
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+# define synchronize_rcu_bh    synchronize_rcu
+#else
 void synchronize_rcu_bh(void);
+#endif
 void synchronize_sched_expedited(void);
 void synchronize_rcu_expedited(void);
 
@@ -72,7 +76,11 @@ static inline void synchronize_rcu_bh_expedited(void)
 }
 
 void rcu_barrier(void);
+#ifdef CONFIG_PREEMPT_RT_FULL
+# define rcu_barrier_bh                rcu_barrier
+#else
 void rcu_barrier_bh(void);
+#endif
 void rcu_barrier_sched(void);
 unsigned long get_state_synchronize_rcu(void);
 void cond_synchronize_rcu(unsigned long oldstate);
@@ -85,12 +93,10 @@ unsigned long rcu_batches_started(void);
 unsigned long rcu_batches_started_bh(void);
 unsigned long rcu_batches_started_sched(void);
 unsigned long rcu_batches_completed(void);
-unsigned long rcu_batches_completed_bh(void);
 unsigned long rcu_batches_completed_sched(void);
 void show_rcu_gp_kthreads(void);
 
 void rcu_force_quiescent_state(void);
-void rcu_bh_force_quiescent_state(void);
 void rcu_sched_force_quiescent_state(void);
 
 void rcu_idle_enter(void);
@@ -105,6 +111,14 @@ extern int rcu_scheduler_active __read_mostly;
 
 bool rcu_is_watching(void);
 
+#ifndef CONFIG_PREEMPT_RT_FULL
+void rcu_bh_force_quiescent_state(void);
+unsigned long rcu_batches_completed_bh(void);
+#else
+# define rcu_bh_force_quiescent_state  rcu_force_quiescent_state
+# define rcu_batches_completed_bh      rcu_batches_completed
+#endif
+
 void rcu_all_qs(void);
 
 #endif /* __LINUX_RCUTREE_H */
diff --git a/include/linux/rtmutex.h b/include/linux/rtmutex.h
index 1abba5ce2a2f..30211c627511 100644
--- a/include/linux/rtmutex.h
+++ b/include/linux/rtmutex.h
@@ -13,11 +13,15 @@
 #define __LINUX_RT_MUTEX_H
 
 #include <linux/linkage.h>
+#include <linux/spinlock_types_raw.h>
 #include <linux/rbtree.h>
-#include <linux/spinlock_types.h>
 
 extern int max_lock_depth; /* for sysctl */
 
+#ifdef CONFIG_DEBUG_MUTEXES
+#include <linux/debug_locks.h>
+#endif
+
 /**
  * The rt_mutex structure
  *
@@ -31,8 +35,8 @@ struct rt_mutex {
        struct rb_root          waiters;
        struct rb_node          *waiters_leftmost;
        struct task_struct      *owner;
-#ifdef CONFIG_DEBUG_RT_MUTEXES
        int                     save_state;
+#ifdef CONFIG_DEBUG_RT_MUTEXES
        const char              *name, *file;
        int                     line;
        void                    *magic;
@@ -55,22 +59,33 @@ struct hrtimer_sleeper;
 # define rt_mutex_debug_check_no_locks_held(task)      do { } while (0)
 #endif
 
+# define rt_mutex_init(mutex)                                  \
+       do {                                                    \
+               raw_spin_lock_init(&(mutex)->wait_lock);        \
+               __rt_mutex_init(mutex, #mutex);                 \
+       } while (0)
+
 #ifdef CONFIG_DEBUG_RT_MUTEXES
 # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname) \
        , .name = #mutexname, .file = __FILE__, .line = __LINE__
-# define rt_mutex_init(mutex)                  __rt_mutex_init(mutex, __func__)
  extern void rt_mutex_debug_task_free(struct task_struct *tsk);
 #else
 # define __DEBUG_RT_MUTEX_INITIALIZER(mutexname)
-# define rt_mutex_init(mutex)                  __rt_mutex_init(mutex, NULL)
 # define rt_mutex_debug_task_free(t)                   do { } while (0)
 #endif
 
-#define __RT_MUTEX_INITIALIZER(mutexname) \
-       { .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
+#define __RT_MUTEX_INITIALIZER_PLAIN(mutexname) \
+        .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(mutexname.wait_lock) \
        , .waiters = RB_ROOT \
        , .owner = NULL \
-       __DEBUG_RT_MUTEX_INITIALIZER(mutexname)}
+       __DEBUG_RT_MUTEX_INITIALIZER(mutexname)
+
+#define __RT_MUTEX_INITIALIZER(mutexname) \
+       { __RT_MUTEX_INITIALIZER_PLAIN(mutexname) }
+
+#define __RT_MUTEX_INITIALIZER_SAVE_STATE(mutexname) \
+       { __RT_MUTEX_INITIALIZER_PLAIN(mutexname)    \
+       , .save_state = 1 }
 
 #define DEFINE_RT_MUTEX(mutexname) \
        struct rt_mutex mutexname = __RT_MUTEX_INITIALIZER(mutexname)
@@ -91,6 +106,7 @@ extern void rt_mutex_destroy(struct rt_mutex *lock);
 
 extern void rt_mutex_lock(struct rt_mutex *lock);
 extern int rt_mutex_lock_interruptible(struct rt_mutex *lock);
+extern int rt_mutex_lock_killable(struct rt_mutex *lock);
 extern int rt_mutex_timed_lock(struct rt_mutex *lock,
                               struct hrtimer_sleeper *timeout);
 
diff --git a/include/linux/rwlock_rt.h b/include/linux/rwlock_rt.h
new file mode 100644
index 000000000000..49ed2d45d3be
--- /dev/null
+++ b/include/linux/rwlock_rt.h
@@ -0,0 +1,99 @@
+#ifndef __LINUX_RWLOCK_RT_H
+#define __LINUX_RWLOCK_RT_H
+
+#ifndef __LINUX_SPINLOCK_H
+#error Do not include directly. Use spinlock.h
+#endif
+
+#define rwlock_init(rwl)                               \
+do {                                                   \
+       static struct lock_class_key __key;             \
+                                                       \
+       rt_mutex_init(&(rwl)->lock);                    \
+       __rt_rwlock_init(rwl, #rwl, &__key);            \
+} while (0)
+
+extern void __lockfunc rt_write_lock(rwlock_t *rwlock);
+extern void __lockfunc rt_read_lock(rwlock_t *rwlock);
+extern int __lockfunc rt_write_trylock(rwlock_t *rwlock);
+extern int __lockfunc rt_write_trylock_irqsave(rwlock_t *trylock, unsigned long *flags);
+extern int __lockfunc rt_read_trylock(rwlock_t *rwlock);
+extern void __lockfunc rt_write_unlock(rwlock_t *rwlock);
+extern void __lockfunc rt_read_unlock(rwlock_t *rwlock);
+extern unsigned long __lockfunc rt_write_lock_irqsave(rwlock_t *rwlock);
+extern unsigned long __lockfunc rt_read_lock_irqsave(rwlock_t *rwlock);
+extern void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key);
+
+#define read_trylock(lock)     __cond_lock(lock, rt_read_trylock(lock))
+#define write_trylock(lock)    __cond_lock(lock, rt_write_trylock(lock))
+
+#define write_trylock_irqsave(lock, flags)     \
+       __cond_lock(lock, rt_write_trylock_irqsave(lock, &flags))
+
+#define read_lock_irqsave(lock, flags)                 \
+       do {                                            \
+               typecheck(unsigned long, flags);        \
+               flags = rt_read_lock_irqsave(lock);     \
+       } while (0)
+
+#define write_lock_irqsave(lock, flags)                        \
+       do {                                            \
+               typecheck(unsigned long, flags);        \
+               flags = rt_write_lock_irqsave(lock);    \
+       } while (0)
+
+#define read_lock(lock)                rt_read_lock(lock)
+
+#define read_lock_bh(lock)                             \
+       do {                                            \
+               local_bh_disable();                     \
+               rt_read_lock(lock);                     \
+       } while (0)
+
+#define read_lock_irq(lock)    read_lock(lock)
+
+#define write_lock(lock)       rt_write_lock(lock)
+
+#define write_lock_bh(lock)                            \
+       do {                                            \
+               local_bh_disable();                     \
+               rt_write_lock(lock);                    \
+       } while (0)
+
+#define write_lock_irq(lock)   write_lock(lock)
+
+#define read_unlock(lock)      rt_read_unlock(lock)
+
+#define read_unlock_bh(lock)                           \
+       do {                                            \
+               rt_read_unlock(lock);                   \
+               local_bh_enable();                      \
+       } while (0)
+
+#define read_unlock_irq(lock)  read_unlock(lock)
+
+#define write_unlock(lock)     rt_write_unlock(lock)
+
+#define write_unlock_bh(lock)                          \
+       do {                                            \
+               rt_write_unlock(lock);                  \
+               local_bh_enable();                      \
+       } while (0)
+
+#define write_unlock_irq(lock) write_unlock(lock)
+
+#define read_unlock_irqrestore(lock, flags)            \
+       do {                                            \
+               typecheck(unsigned long, flags);        \
+               (void) flags;                           \
+               rt_read_unlock(lock);                   \
+       } while (0)
+
+#define write_unlock_irqrestore(lock, flags) \
+       do {                                            \
+               typecheck(unsigned long, flags);        \
+               (void) flags;                           \
+               rt_write_unlock(lock);                  \
+       } while (0)
+
+#endif
diff --git a/include/linux/rwlock_types.h b/include/linux/rwlock_types.h
index cc0072e93e36..d0da966ad7a0 100644
--- a/include/linux/rwlock_types.h
+++ b/include/linux/rwlock_types.h
@@ -1,6 +1,10 @@
 #ifndef __LINUX_RWLOCK_TYPES_H
 #define __LINUX_RWLOCK_TYPES_H
 
+#if !defined(__LINUX_SPINLOCK_TYPES_H)
+# error "Do not include directly, include spinlock_types.h"
+#endif
+
 /*
  * include/linux/rwlock_types.h - generic rwlock type definitions
  *                               and initializers
@@ -43,6 +47,7 @@ typedef struct {
                                RW_DEP_MAP_INIT(lockname) }
 #endif
 
-#define DEFINE_RWLOCK(x)       rwlock_t x = __RW_LOCK_UNLOCKED(x)
+#define DEFINE_RWLOCK(name) \
+       rwlock_t name __cacheline_aligned_in_smp = __RW_LOCK_UNLOCKED(name)
 
 #endif /* __LINUX_RWLOCK_TYPES_H */
diff --git a/include/linux/rwlock_types_rt.h b/include/linux/rwlock_types_rt.h
new file mode 100644
index 000000000000..b13832119591
--- /dev/null
+++ b/include/linux/rwlock_types_rt.h
@@ -0,0 +1,33 @@
+#ifndef __LINUX_RWLOCK_TYPES_RT_H
+#define __LINUX_RWLOCK_TYPES_RT_H
+
+#ifndef __LINUX_SPINLOCK_TYPES_H
+#error "Do not include directly. Include spinlock_types.h instead"
+#endif
+
+/*
+ * rwlocks - rtmutex which allows single reader recursion
+ */
+typedef struct {
+       struct rt_mutex         lock;
+       int                     read_depth;
+       unsigned int            break_lock;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+       struct lockdep_map      dep_map;
+#endif
+} rwlock_t;
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define RW_DEP_MAP_INIT(lockname)     .dep_map = { .name = #lockname }
+#else
+# define RW_DEP_MAP_INIT(lockname)
+#endif
+
+#define __RW_LOCK_UNLOCKED(name) \
+       { .lock = __RT_MUTEX_INITIALIZER_SAVE_STATE(name.lock), \
+         RW_DEP_MAP_INIT(name) }
+
+#define DEFINE_RWLOCK(name) \
+       rwlock_t name __cacheline_aligned_in_smp = __RW_LOCK_UNLOCKED(name)
+
+#endif
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index 8f498cdde280..2b2148431f14 100644
--- a/include/linux/rwsem.h
+++ b/include/linux/rwsem.h
@@ -18,6 +18,10 @@
 #include <linux/osq_lock.h>
 #endif
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+#include <linux/rwsem_rt.h>
+#else /* PREEMPT_RT_FULL */
+
 struct rw_semaphore;
 
 #ifdef CONFIG_RWSEM_GENERIC_SPINLOCK
@@ -177,4 +181,6 @@ extern void up_read_non_owner(struct rw_semaphore *sem);
 # define up_read_non_owner(sem)                        up_read(sem)
 #endif
 
+#endif /* !PREEMPT_RT_FULL */
+
 #endif /* _LINUX_RWSEM_H */
diff --git a/include/linux/rwsem_rt.h b/include/linux/rwsem_rt.h
new file mode 100644
index 000000000000..f97860b2e2a4
--- /dev/null
+++ b/include/linux/rwsem_rt.h
@@ -0,0 +1,152 @@
+#ifndef _LINUX_RWSEM_RT_H
+#define _LINUX_RWSEM_RT_H
+
+#ifndef _LINUX_RWSEM_H
+#error "Include rwsem.h"
+#endif
+
+/*
+ * RW-semaphores are a spinlock plus a reader-depth count.
+ *
+ * Note that the semantics are different from the usual
+ * Linux rw-sems, in PREEMPT_RT mode we do not allow
+ * multiple readers to hold the lock at once, we only allow
+ * a read-lock owner to read-lock recursively. This is
+ * better for latency, makes the implementation inherently
+ * fair and makes it simpler as well.
+ */
+
+#include <linux/rtmutex.h>
+
+struct rw_semaphore {
+       struct rt_mutex         lock;
+       int                     read_depth;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+       struct lockdep_map      dep_map;
+#endif
+};
+
+#define __RWSEM_INITIALIZER(name) \
+       { .lock = __RT_MUTEX_INITIALIZER(name.lock), \
+         RW_DEP_MAP_INIT(name) }
+
+#define DECLARE_RWSEM(lockname) \
+       struct rw_semaphore lockname = __RWSEM_INITIALIZER(lockname)
+
+extern void  __rt_rwsem_init(struct rw_semaphore *rwsem, const char *name,
+                                    struct lock_class_key *key);
+
+#define __rt_init_rwsem(sem, name, key)                        \
+       do {                                            \
+               rt_mutex_init(&(sem)->lock);            \
+               __rt_rwsem_init((sem), (name), (key));\
+       } while (0)
+
+#define __init_rwsem(sem, name, key) __rt_init_rwsem(sem, name, key)
+
+# define rt_init_rwsem(sem)                            \
+do {                                                   \
+       static struct lock_class_key __key;             \
+                                                       \
+       __rt_init_rwsem((sem), #sem, &__key);           \
+} while (0)
+
+extern void rt_down_write(struct rw_semaphore *rwsem);
+extern void rt_down_read_nested(struct rw_semaphore *rwsem, int subclass);
+extern void rt_down_write_nested(struct rw_semaphore *rwsem, int subclass);
+extern void rt_down_write_nested_lock(struct rw_semaphore *rwsem,
+                                     struct lockdep_map *nest);
+extern void rt__down_read(struct rw_semaphore *rwsem);
+extern void rt_down_read(struct rw_semaphore *rwsem);
+extern int  rt_down_write_trylock(struct rw_semaphore *rwsem);
+extern int  rt__down_read_trylock(struct rw_semaphore *rwsem);
+extern int  rt_down_read_trylock(struct rw_semaphore *rwsem);
+extern void __rt_up_read(struct rw_semaphore *rwsem);
+extern void rt_up_read(struct rw_semaphore *rwsem);
+extern void rt_up_write(struct rw_semaphore *rwsem);
+extern void rt_downgrade_write(struct rw_semaphore *rwsem);
+
+#define init_rwsem(sem)                rt_init_rwsem(sem)
+#define rwsem_is_locked(s)     rt_mutex_is_locked(&(s)->lock)
+
+static inline int rwsem_is_contended(struct rw_semaphore *sem)
+{
+       /* rt_mutex_has_waiters() */
+       return !RB_EMPTY_ROOT(&sem->lock.waiters);
+}
+
+static inline void __down_read(struct rw_semaphore *sem)
+{
+       rt__down_read(sem);
+}
+
+static inline void down_read(struct rw_semaphore *sem)
+{
+       rt_down_read(sem);
+}
+
+static inline int __down_read_trylock(struct rw_semaphore *sem)
+{
+       return rt__down_read_trylock(sem);
+}
+
+static inline int down_read_trylock(struct rw_semaphore *sem)
+{
+       return rt_down_read_trylock(sem);
+}
+
+static inline void down_write(struct rw_semaphore *sem)
+{
+       rt_down_write(sem);
+}
+
+static inline int down_write_trylock(struct rw_semaphore *sem)
+{
+       return rt_down_write_trylock(sem);
+}
+
+static inline void __up_read(struct rw_semaphore *sem)
+{
+       __rt_up_read(sem);
+}
+
+static inline void up_read(struct rw_semaphore *sem)
+{
+       rt_up_read(sem);
+}
+
+static inline void up_write(struct rw_semaphore *sem)
+{
+       rt_up_write(sem);
+}
+
+static inline void downgrade_write(struct rw_semaphore *sem)
+{
+       rt_downgrade_write(sem);
+}
+
+static inline void down_read_nested(struct rw_semaphore *sem, int subclass)
+{
+       return rt_down_read_nested(sem, subclass);
+}
+
+static inline void down_write_nested(struct rw_semaphore *sem, int subclass)
+{
+       rt_down_write_nested(sem, subclass);
+}
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static inline void down_write_nest_lock(struct rw_semaphore *sem,
+               struct rw_semaphore *nest_lock)
+{
+       rt_down_write_nested_lock(sem, &nest_lock->dep_map);
+}
+
+#else
+
+static inline void down_write_nest_lock(struct rw_semaphore *sem,
+               struct rw_semaphore *nest_lock)
+{
+       rt_down_write_nested_lock(sem, NULL);
+}
+#endif
+#endif
diff --git a/include/linux/sched.h b/include/linux/sched.h
index e887c8d6f395..f37654adf12a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -26,6 +26,7 @@ struct sched_param {
 #include <linux/nodemask.h>
 #include <linux/mm_types.h>
 #include <linux/preempt.h>
+#include <asm/kmap_types.h>
 
 #include <asm/page.h>
 #include <asm/ptrace.h>
@@ -182,8 +183,6 @@ extern void update_cpu_load_nohz(void);
 static inline void update_cpu_load_nohz(void) { }
 #endif
 
-extern unsigned long get_parent_ip(unsigned long addr);
-
 extern void dump_cpu_task(int cpu);
 
 struct seq_file;
@@ -235,17 +234,13 @@ extern char ___assert_task_state[1 - 2*!!(
 
 /* Convenience macros for the sake of wake_up */
 #define TASK_NORMAL            (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
-#define TASK_ALL               (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
 
 /* get_task_state() */
 #define TASK_REPORT            (TASK_RUNNING | TASK_INTERRUPTIBLE | \
                                 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
                                 __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD)
 
-#define task_is_traced(task)   ((task->state & __TASK_TRACED) != 0)
 #define task_is_stopped(task)  ((task->state & __TASK_STOPPED) != 0)
-#define task_is_stopped_or_traced(task)        \
-                       ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
 #define task_contributes_to_load(task) \
                                ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
                                 (task->flags & PF_FROZEN) == 0 && \
@@ -311,6 +306,11 @@ extern char ___assert_task_state[1 - 2*!!(
 
 #endif
 
+#define __set_current_state_no_track(state_value)      \
+       do { current->state = (state_value); } while (0)
+#define set_current_state_no_track(state_value)                \
+       set_mb(current->state, (state_value))
+
 /* Task command name length */
 #define TASK_COMM_LEN 16
 
@@ -979,9 +979,31 @@ struct wake_q_head {
 #define WAKE_Q(name)                                   \
        struct wake_q_head name = { WAKE_Q_TAIL, &name.first }
 
-extern void wake_q_add(struct wake_q_head *head,
-                      struct task_struct *task);
-extern void wake_up_q(struct wake_q_head *head);
+extern void __wake_q_add(struct wake_q_head *head,
+                        struct task_struct *task, bool sleeper);
+static inline void wake_q_add(struct wake_q_head *head,
+                             struct task_struct *task)
+{
+       __wake_q_add(head, task, false);
+}
+
+static inline void wake_q_add_sleeper(struct wake_q_head *head,
+                                     struct task_struct *task)
+{
+       __wake_q_add(head, task, true);
+}
+
+extern void __wake_up_q(struct wake_q_head *head, bool sleeper);
+
+static inline void wake_up_q(struct wake_q_head *head)
+{
+       __wake_up_q(head, false);
+}
+
+static inline void wake_up_q_sleeper(struct wake_q_head *head)
+{
+       __wake_up_q(head, true);
+}
 
 /*
  * sched-domains (multiprocessor balancing) declarations:
@@ -1389,6 +1411,7 @@ struct tlbflush_unmap_batch {
 
 struct task_struct {
        volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
+       volatile long saved_state;      /* saved state for "spinlock sleepers" */
        void *stack;
        atomic_t usage;
        unsigned int flags;     /* per process flags, defined below */
@@ -1425,6 +1448,13 @@ struct task_struct {
 #endif
 
        unsigned int policy;
+#ifdef CONFIG_PREEMPT_RT_FULL
+       int migrate_disable;
+       int migrate_disable_update;
+# ifdef CONFIG_SCHED_DEBUG
+       int migrate_disable_atomic;
+# endif
+#endif
        int nr_cpus_allowed;
        cpumask_t cpus_allowed;
 
@@ -1536,11 +1566,14 @@ struct task_struct {
        cputime_t gtime;
        struct prev_cputime prev_cputime;
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
-       seqlock_t vtime_seqlock;
+       seqcount_t vtime_seqcount;
        unsigned long long vtime_snap;
        enum {
-               VTIME_SLEEPING = 0,
+               /* Task is sleeping or running in a CPU with VTIME inactive */
+               VTIME_INACTIVE = 0,
+               /* Task runs in userspace in a CPU with VTIME active */
                VTIME_USER,
+               /* Task runs in kernelspace in a CPU with VTIME active */
                VTIME_SYS,
        } vtime_snap_whence;
 #endif
@@ -1552,6 +1585,9 @@ struct task_struct {
 
        struct task_cputime cputime_expires;
        struct list_head cpu_timers[3];
+#ifdef CONFIG_PREEMPT_RT_BASE
+       struct task_struct *posix_timer_list;
+#endif
 
 /* process credentials */
        const struct cred __rcu *ptracer_cred; /* Tracer's credentials at attach */
@@ -1583,10 +1619,15 @@ struct task_struct {
 /* signal handlers */
        struct signal_struct *signal;
        struct sighand_struct *sighand;
+       struct sigqueue *sigqueue_cache;
 
        sigset_t blocked, real_blocked;
        sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */
        struct sigpending pending;
+#ifdef CONFIG_PREEMPT_RT_FULL
+       /* TODO: move me into ->restart_block ? */
+       struct siginfo forced_info;
+#endif
 
        unsigned long sas_ss_sp;
        size_t sas_ss_size;
@@ -1611,6 +1652,7 @@ struct task_struct {
        raw_spinlock_t pi_lock;
 
        struct wake_q_node wake_q;
+       struct wake_q_node wake_q_sleeper;
 
 #ifdef CONFIG_RT_MUTEXES
        /* PI waiters blocked on a rt_mutex held by this task */
@@ -1810,6 +1852,12 @@ struct task_struct {
        unsigned long trace;
        /* bitmask and counter of trace recursion */
        unsigned long trace_recursion;
+#ifdef CONFIG_WAKEUP_LATENCY_HIST
+       u64 preempt_timestamp_hist;
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+       long timer_offset;
+#endif
+#endif
 #endif /* CONFIG_TRACING */
 #ifdef CONFIG_MEMCG
        struct mem_cgroup *memcg_in_oom;
@@ -1826,8 +1874,22 @@ struct task_struct {
        unsigned int    sequential_io;
        unsigned int    sequential_io_avg;
 #endif
+#ifdef CONFIG_PREEMPT_RT_BASE
+       struct rcu_head put_rcu;
+       int softirq_nestcnt;
+       unsigned int softirqs_raised;
+#endif
+#ifdef CONFIG_PREEMPT_RT_FULL
+# if defined CONFIG_HIGHMEM || defined CONFIG_X86_32
+       int kmap_idx;
+       pte_t kmap_pte[KM_TYPE_NR];
+# endif
+#endif
 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
        unsigned long   task_state_change;
+#endif
+#ifdef CONFIG_PREEMPT_RT_FULL
+       int xmit_recursion;
 #endif
        int pagefault_disabled;
 /* CPU-specific state of this task */
@@ -1846,9 +1908,6 @@ extern int arch_task_struct_size __read_mostly;
 # define arch_task_struct_size (sizeof(struct task_struct))
 #endif
 
-/* Future-safe accessor for struct task_struct's cpus_allowed. */
-#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
-
 #define TNF_MIGRATED   0x01
 #define TNF_NO_GROUP   0x02
 #define TNF_SHARED     0x04
@@ -2042,6 +2101,15 @@ extern struct pid *cad_pid;
 extern void free_task(struct task_struct *tsk);
 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
 
+#ifdef CONFIG_PREEMPT_RT_BASE
+extern void __put_task_struct_cb(struct rcu_head *rhp);
+
+static inline void put_task_struct(struct task_struct *t)
+{
+       if (atomic_dec_and_test(&t->usage))
+               call_rcu(&t->put_rcu, __put_task_struct_cb);
+}
+#else
 extern void __put_task_struct(struct task_struct *t);
 
 static inline void put_task_struct(struct task_struct *t)
@@ -2049,6 +2117,7 @@ static inline void put_task_struct(struct task_struct *t)
        if (atomic_dec_and_test(&t->usage))
                __put_task_struct(t);
 }
+#endif
 
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
 extern void task_cputime(struct task_struct *t,
@@ -2087,6 +2156,7 @@ extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut,
 /*
  * Per process flags
  */
+#define PF_IN_SOFTIRQ  0x00000001      /* Task is serving softirq */
 #define PF_EXITING     0x00000004      /* getting shut down */
 #define PF_EXITPIDONE  0x00000008      /* pi exit done on shut down */
 #define PF_VCPU                0x00000010      /* I'm a virtual CPU */
@@ -2251,6 +2321,10 @@ extern void do_set_cpus_allowed(struct task_struct *p,
 
 extern int set_cpus_allowed_ptr(struct task_struct *p,
                                const struct cpumask *new_mask);
+int migrate_me(void);
+void tell_sched_cpu_down_begin(int cpu);
+void tell_sched_cpu_down_done(int cpu);
+
 #else
 static inline void do_set_cpus_allowed(struct task_struct *p,
                                      const struct cpumask *new_mask)
@@ -2263,6 +2337,9 @@ static inline int set_cpus_allowed_ptr(struct task_struct *p,
                return -EINVAL;
        return 0;
 }
+static inline int migrate_me(void) { return 0; }
+static inline void tell_sched_cpu_down_begin(int cpu) { }
+static inline void tell_sched_cpu_down_done(int cpu) { }
 #endif
 
 #ifdef CONFIG_NO_HZ_COMMON
@@ -2472,6 +2549,7 @@ extern void xtime_update(unsigned long ticks);
 
 extern int wake_up_state(struct task_struct *tsk, unsigned int state);
 extern int wake_up_process(struct task_struct *tsk);
+extern int wake_up_lock_sleeper(struct task_struct * tsk);
 extern void wake_up_new_task(struct task_struct *tsk);
 #ifdef CONFIG_SMP
  extern void kick_process(struct task_struct *tsk);
@@ -2595,12 +2673,24 @@ extern struct mm_struct * mm_alloc(void);
 
 /* mmdrop drops the mm and the page tables */
 extern void __mmdrop(struct mm_struct *);
+
 static inline void mmdrop(struct mm_struct * mm)
 {
        if (unlikely(atomic_dec_and_test(&mm->mm_count)))
                __mmdrop(mm);
 }
 
+#ifdef CONFIG_PREEMPT_RT_BASE
+extern void __mmdrop_delayed(struct rcu_head *rhp);
+static inline void mmdrop_delayed(struct mm_struct *mm)
+{
+       if (atomic_dec_and_test(&mm->mm_count))
+               call_rcu(&mm->delayed_drop, __mmdrop_delayed);
+}
+#else
+# define mmdrop_delayed(mm)    mmdrop(mm)
+#endif
+
 /* mmput gets rid of the mappings and all user-space */
 extern void mmput(struct mm_struct *);
 /* Grab a reference to a task's mm, if it is not already going away */
@@ -2910,6 +3000,43 @@ static inline int test_tsk_need_resched(struct task_struct *tsk)
        return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
 }
 
+#ifdef CONFIG_PREEMPT_LAZY
+static inline void set_tsk_need_resched_lazy(struct task_struct *tsk)
+{
+       set_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY);
+}
+
+static inline void clear_tsk_need_resched_lazy(struct task_struct *tsk)
+{
+       clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY);
+}
+
+static inline int test_tsk_need_resched_lazy(struct task_struct *tsk)
+{
+       return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED_LAZY));
+}
+
+static inline int need_resched_lazy(void)
+{
+       return test_thread_flag(TIF_NEED_RESCHED_LAZY);
+}
+
+static inline int need_resched_now(void)
+{
+       return test_thread_flag(TIF_NEED_RESCHED);
+}
+
+#else
+static inline void clear_tsk_need_resched_lazy(struct task_struct *tsk) { }
+static inline int need_resched_lazy(void) { return 0; }
+
+static inline int need_resched_now(void)
+{
+       return test_thread_flag(TIF_NEED_RESCHED);
+}
+
+#endif
+
 static inline int restart_syscall(void)
 {
        set_tsk_thread_flag(current, TIF_SIGPENDING);
@@ -2941,6 +3068,51 @@ static inline int signal_pending_state(long state, struct task_struct *p)
        return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
 }
 
+static inline bool __task_is_stopped_or_traced(struct task_struct *task)
+{
+       if (task->state & (__TASK_STOPPED | __TASK_TRACED))
+               return true;
+#ifdef CONFIG_PREEMPT_RT_FULL
+       if (task->saved_state & (__TASK_STOPPED | __TASK_TRACED))
+               return true;
+#endif
+       return false;
+}
+
+static inline bool task_is_stopped_or_traced(struct task_struct *task)
+{
+       bool traced_stopped;
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+       unsigned long flags;
+
+       raw_spin_lock_irqsave(&task->pi_lock, flags);
+       traced_stopped = __task_is_stopped_or_traced(task);
+       raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+#else
+       traced_stopped = __task_is_stopped_or_traced(task);
+#endif
+       return traced_stopped;
+}
+
+static inline bool task_is_traced(struct task_struct *task)
+{
+       bool traced = false;
+
+       if (task->state & __TASK_TRACED)
+               return true;
+#ifdef CONFIG_PREEMPT_RT_FULL
+       /* in case the task is sleeping on tasklist_lock */
+       raw_spin_lock_irq(&task->pi_lock);
+       if (task->state & __TASK_TRACED)
+               traced = true;
+       else if (task->saved_state & __TASK_TRACED)
+               traced = true;
+       raw_spin_unlock_irq(&task->pi_lock);
+#endif
+       return traced;
+}
+
 /*
  * cond_resched() and cond_resched_lock(): latency reduction via
  * explicit rescheduling in places that are safe. The return
@@ -2962,12 +3134,16 @@ extern int __cond_resched_lock(spinlock_t *lock);
        __cond_resched_lock(lock);                              \
 })
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 extern int __cond_resched_softirq(void);
 
 #define cond_resched_softirq() ({                                      \
        ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET);     \
        __cond_resched_softirq();                                       \
 })
+#else
+# define cond_resched_softirq()                cond_resched()
+#endif
 
 static inline void cond_resched_rcu(void)
 {
@@ -3129,6 +3305,31 @@ static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
 
 #endif /* CONFIG_SMP */
 
+static inline int __migrate_disabled(struct task_struct *p)
+{
+#ifdef CONFIG_PREEMPT_RT_FULL
+       return p->migrate_disable;
+#else
+       return 0;
+#endif
+}
+
+/* Future-safe accessor for struct task_struct's cpus_allowed. */
+static inline const struct cpumask *tsk_cpus_allowed(struct task_struct *p)
+{
+       if (__migrate_disabled(p))
+               return cpumask_of(task_cpu(p));
+
+       return &p->cpus_allowed;
+}
+
+static inline int tsk_nr_cpus_allowed(struct task_struct *p)
+{
+       if (__migrate_disabled(p))
+               return 1;
+       return p->nr_cpus_allowed;
+}
+
 extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
 extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
 
diff --git a/include/linux/seqlock.h b/include/linux/seqlock.h
index e0582106ef4f..b14f4d2368aa 100644
--- a/include/linux/seqlock.h
+++ b/include/linux/seqlock.h
@@ -220,20 +220,30 @@ static inline int read_seqcount_retry(const seqcount_t *s, unsigned start)
        return __read_seqcount_retry(s, start);
 }
 
-
-
-static inline void raw_write_seqcount_begin(seqcount_t *s)
+static inline void __raw_write_seqcount_begin(seqcount_t *s)
 {
        s->sequence++;
        smp_wmb();
 }
 
-static inline void raw_write_seqcount_end(seqcount_t *s)
+static inline void raw_write_seqcount_begin(seqcount_t *s)
+{
+       preempt_disable_rt();
+       __raw_write_seqcount_begin(s);
+}
+
+static inline void __raw_write_seqcount_end(seqcount_t *s)
 {
        smp_wmb();
        s->sequence++;
 }
 
+static inline void raw_write_seqcount_end(seqcount_t *s)
+{
+       __raw_write_seqcount_end(s);
+       preempt_enable_rt();
+}
+
 /**
  * raw_write_seqcount_barrier - do a seq write barrier
  * @s: pointer to seqcount_t
@@ -425,10 +435,32 @@ typedef struct {
 /*
  * Read side functions for starting and finalizing a read side section.
  */
+#ifndef CONFIG_PREEMPT_RT_FULL
 static inline unsigned read_seqbegin(const seqlock_t *sl)
 {
        return read_seqcount_begin(&sl->seqcount);
 }
+#else
+/*
+ * Starvation safe read side for RT
+ */
+static inline unsigned read_seqbegin(seqlock_t *sl)
+{
+       unsigned ret;
+
+repeat:
+       ret = ACCESS_ONCE(sl->seqcount.sequence);
+       if (unlikely(ret & 1)) {
+               /*
+                * Take the lock and let the writer proceed (i.e. evtl
+                * boost it), otherwise we could loop here forever.
+                */
+               spin_unlock_wait(&sl->lock);
+               goto repeat;
+       }
+       return ret;
+}
+#endif
 
 static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start)
 {
@@ -443,36 +475,36 @@ static inline unsigned read_seqretry(const seqlock_t *sl, unsigned start)
 static inline void write_seqlock(seqlock_t *sl)
 {
        spin_lock(&sl->lock);
-       write_seqcount_begin(&sl->seqcount);
+       __raw_write_seqcount_begin(&sl->seqcount);
 }
 
 static inline void write_sequnlock(seqlock_t *sl)
 {
-       write_seqcount_end(&sl->seqcount);
+       __raw_write_seqcount_end(&sl->seqcount);
        spin_unlock(&sl->lock);
 }
 
 static inline void write_seqlock_bh(seqlock_t *sl)
 {
        spin_lock_bh(&sl->lock);
-       write_seqcount_begin(&sl->seqcount);
+       __raw_write_seqcount_begin(&sl->seqcount);
 }
 
 static inline void write_sequnlock_bh(seqlock_t *sl)
 {
-       write_seqcount_end(&sl->seqcount);
+       __raw_write_seqcount_end(&sl->seqcount);
        spin_unlock_bh(&sl->lock);
 }
 
 static inline void write_seqlock_irq(seqlock_t *sl)
 {
        spin_lock_irq(&sl->lock);
-       write_seqcount_begin(&sl->seqcount);
+       __raw_write_seqcount_begin(&sl->seqcount);
 }
 
 static inline void write_sequnlock_irq(seqlock_t *sl)
 {
-       write_seqcount_end(&sl->seqcount);
+       __raw_write_seqcount_end(&sl->seqcount);
        spin_unlock_irq(&sl->lock);
 }
 
@@ -481,7 +513,7 @@ static inline unsigned long __write_seqlock_irqsave(seqlock_t *sl)
        unsigned long flags;
 
        spin_lock_irqsave(&sl->lock, flags);
-       write_seqcount_begin(&sl->seqcount);
+       __raw_write_seqcount_begin(&sl->seqcount);
        return flags;
 }
 
@@ -491,7 +523,7 @@ static inline unsigned long __write_seqlock_irqsave(seqlock_t *sl)
 static inline void
 write_sequnlock_irqrestore(seqlock_t *sl, unsigned long flags)
 {
-       write_seqcount_end(&sl->seqcount);
+       __raw_write_seqcount_end(&sl->seqcount);
        spin_unlock_irqrestore(&sl->lock, flags);
 }
 
diff --git a/include/linux/signal.h b/include/linux/signal.h
index d80259afb9e5..ddd1e6866a54 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -233,6 +233,7 @@ static inline void init_sigpending(struct sigpending *sig)
 }
 
 extern void flush_sigqueue(struct sigpending *queue);
+extern void flush_task_sigqueue(struct task_struct *tsk);
 
 /* Test if 'sig' is valid signal. Use this instead of testing _NSIG directly */
 static inline int valid_signal(unsigned long sig)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index b5421f6f155a..b05be76fc504 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -203,6 +203,7 @@ struct sk_buff_head {
 
        __u32           qlen;
        spinlock_t      lock;
+       raw_spinlock_t  raw_lock;
 };
 
 struct sk_buff;
@@ -1462,6 +1463,12 @@ static inline void skb_queue_head_init(struct sk_buff_head *list)
        __skb_queue_head_init(list);
 }
 
+static inline void skb_queue_head_init_raw(struct sk_buff_head *list)
+{
+       raw_spin_lock_init(&list->raw_lock);
+       __skb_queue_head_init(list);
+}
+
 static inline void skb_queue_head_init_class(struct sk_buff_head *list,
                struct lock_class_key *class)
 {
diff --git a/include/linux/smp.h b/include/linux/smp.h
index c4414074bd88..e6ab36aeaaab 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -185,6 +185,9 @@ static inline void smp_init(void) { }
 #define get_cpu()              ({ preempt_disable(); smp_processor_id(); })
 #define put_cpu()              preempt_enable()
 
+#define get_cpu_light()                ({ migrate_disable(); smp_processor_id(); })
+#define put_cpu_light()                migrate_enable()
+
 /*
  * Callback to arch code if there's nosmp or maxcpus=0 on the
  * boot command line:
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 47dd0cebd204..02928fa5499d 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -271,7 +271,11 @@ static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
 #define raw_spin_can_lock(lock)        (!raw_spin_is_locked(lock))
 
 /* Include rwlock functions */
-#include <linux/rwlock.h>
+#ifdef CONFIG_PREEMPT_RT_FULL
+# include <linux/rwlock_rt.h>
+#else
+# include <linux/rwlock.h>
+#endif
 
 /*
  * Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
@@ -282,6 +286,10 @@ static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
 # include <linux/spinlock_api_up.h>
 #endif
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+# include <linux/spinlock_rt.h>
+#else /* PREEMPT_RT_FULL */
+
 /*
  * Map the spin_lock functions to the raw variants for PREEMPT_RT=n
  */
@@ -347,6 +355,12 @@ static __always_inline void spin_unlock(spinlock_t *lock)
        raw_spin_unlock(&lock->rlock);
 }
 
+static __always_inline int spin_unlock_no_deboost(spinlock_t *lock)
+{
+       raw_spin_unlock(&lock->rlock);
+       return 0;
+}
+
 static __always_inline void spin_unlock_bh(spinlock_t *lock)
 {
        raw_spin_unlock_bh(&lock->rlock);
@@ -416,4 +430,6 @@ extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock);
 #define atomic_dec_and_lock(atomic, lock) \
                __cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
 
+#endif /* !PREEMPT_RT_FULL */
+
 #endif /* __LINUX_SPINLOCK_H */
diff --git a/include/linux/spinlock_api_smp.h b/include/linux/spinlock_api_smp.h
index 5344268e6e62..043263f30e81 100644
--- a/include/linux/spinlock_api_smp.h
+++ b/include/linux/spinlock_api_smp.h
@@ -189,6 +189,8 @@ static inline int __raw_spin_trylock_bh(raw_spinlock_t *lock)
        return 0;
 }
 
-#include <linux/rwlock_api_smp.h>
+#ifndef CONFIG_PREEMPT_RT_FULL
+# include <linux/rwlock_api_smp.h>
+#endif
 
 #endif /* __LINUX_SPINLOCK_API_SMP_H */
diff --git a/include/linux/spinlock_rt.h b/include/linux/spinlock_rt.h
new file mode 100644
index 000000000000..7eb87584e843
--- /dev/null
+++ b/include/linux/spinlock_rt.h
@@ -0,0 +1,165 @@
+#ifndef __LINUX_SPINLOCK_RT_H
+#define __LINUX_SPINLOCK_RT_H
+
+#ifndef __LINUX_SPINLOCK_H
+#error Do not include directly. Use spinlock.h
+#endif
+
+#include <linux/bug.h>
+
+extern void
+__rt_spin_lock_init(spinlock_t *lock, char *name, struct lock_class_key *key);
+
+#define spin_lock_init(slock)                          \
+do {                                                   \
+       static struct lock_class_key __key;             \
+                                                       \
+       rt_mutex_init(&(slock)->lock);                  \
+       __rt_spin_lock_init(slock, #slock, &__key);     \
+} while (0)
+
+void __lockfunc rt_spin_lock__no_mg(spinlock_t *lock);
+void __lockfunc rt_spin_unlock__no_mg(spinlock_t *lock);
+int __lockfunc rt_spin_trylock__no_mg(spinlock_t *lock);
+
+extern void __lockfunc rt_spin_lock(spinlock_t *lock);
+extern unsigned long __lockfunc rt_spin_lock_trace_flags(spinlock_t *lock);
+extern void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass);
+extern void __lockfunc rt_spin_unlock(spinlock_t *lock);
+extern int __lockfunc rt_spin_unlock_no_deboost(spinlock_t *lock);
+extern void __lockfunc rt_spin_unlock_wait(spinlock_t *lock);
+extern int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags);
+extern int __lockfunc rt_spin_trylock_bh(spinlock_t *lock);
+extern int __lockfunc rt_spin_trylock(spinlock_t *lock);
+extern int atomic_dec_and_spin_lock(atomic_t *atomic, spinlock_t *lock);
+
+/*
+ * lockdep-less calls, for derived types like rwlock:
+ * (for trylock they can use rt_mutex_trylock() directly.
+ */
+extern void __lockfunc __rt_spin_lock__no_mg(struct rt_mutex *lock);
+extern void __lockfunc __rt_spin_lock(struct rt_mutex *lock);
+extern void __lockfunc __rt_spin_unlock(struct rt_mutex *lock);
+extern int __lockfunc __rt_spin_trylock(struct rt_mutex *lock);
+
+#define spin_lock(lock)                        rt_spin_lock(lock)
+
+#define spin_lock_bh(lock)                     \
+       do {                                    \
+               local_bh_disable();             \
+               rt_spin_lock(lock);             \
+       } while (0)
+
+#define spin_lock_irq(lock)            spin_lock(lock)
+
+#define spin_do_trylock(lock)          __cond_lock(lock, rt_spin_trylock(lock))
+
+#define spin_trylock(lock)                     \
+({                                             \
+       int __locked;                           \
+       __locked = spin_do_trylock(lock);       \
+       __locked;                               \
+})
+
+#ifdef CONFIG_LOCKDEP
+# define spin_lock_nested(lock, subclass)              \
+       do {                                            \
+               rt_spin_lock_nested(lock, subclass);    \
+       } while (0)
+
+#define spin_lock_bh_nested(lock, subclass)            \
+       do {                                            \
+               local_bh_disable();                     \
+               rt_spin_lock_nested(lock, subclass);    \
+       } while (0)
+
+# define spin_lock_irqsave_nested(lock, flags, subclass) \
+       do {                                             \
+               typecheck(unsigned long, flags);         \
+               flags = 0;                               \
+               rt_spin_lock_nested(lock, subclass);     \
+       } while (0)
+#else
+# define spin_lock_nested(lock, subclass)      spin_lock(lock)
+# define spin_lock_bh_nested(lock, subclass)   spin_lock_bh(lock)
+
+# define spin_lock_irqsave_nested(lock, flags, subclass) \
+       do {                                             \
+               typecheck(unsigned long, flags);         \
+               flags = 0;                               \
+               spin_lock(lock);                         \
+       } while (0)
+#endif
+
+#define spin_lock_irqsave(lock, flags)                  \
+       do {                                             \
+               typecheck(unsigned long, flags);         \
+               flags = 0;                               \
+               spin_lock(lock);                         \
+       } while (0)
+
+static inline unsigned long spin_lock_trace_flags(spinlock_t *lock)
+{
+       unsigned long flags = 0;
+#ifdef CONFIG_TRACE_IRQFLAGS
+       flags = rt_spin_lock_trace_flags(lock);
+#else
+       spin_lock(lock); /* lock_local */
+#endif
+       return flags;
+}
+
+/* FIXME: we need rt_spin_lock_nest_lock */
+#define spin_lock_nest_lock(lock, nest_lock) spin_lock_nested(lock, 0)
+
+#define spin_unlock(lock)                      rt_spin_unlock(lock)
+#define spin_unlock_no_deboost(lock)           rt_spin_unlock_no_deboost(lock)
+
+#define spin_unlock_bh(lock)                           \
+       do {                                            \
+               rt_spin_unlock(lock);                   \
+               local_bh_enable();                      \
+       } while (0)
+
+#define spin_unlock_irq(lock)          spin_unlock(lock)
+
+#define spin_unlock_irqrestore(lock, flags)            \
+       do {                                            \
+               typecheck(unsigned long, flags);        \
+               (void) flags;                           \
+               spin_unlock(lock);                      \
+       } while (0)
+
+#define spin_trylock_bh(lock)  __cond_lock(lock, rt_spin_trylock_bh(lock))
+#define spin_trylock_irq(lock) spin_trylock(lock)
+
+#define spin_trylock_irqsave(lock, flags)      \
+       rt_spin_trylock_irqsave(lock, &(flags))
+
+#define spin_unlock_wait(lock)         rt_spin_unlock_wait(lock)
+
+#ifdef CONFIG_GENERIC_LOCKBREAK
+# define spin_is_contended(lock)       ((lock)->break_lock)
+#else
+# define spin_is_contended(lock)       (((void)(lock), 0))
+#endif
+
+static inline int spin_can_lock(spinlock_t *lock)
+{
+       return !rt_mutex_is_locked(&lock->lock);
+}
+
+static inline int spin_is_locked(spinlock_t *lock)
+{
+       return rt_mutex_is_locked(&lock->lock);
+}
+
+static inline void assert_spin_locked(spinlock_t *lock)
+{
+       BUG_ON(!spin_is_locked(lock));
+}
+
+#define atomic_dec_and_lock(atomic, lock) \
+       atomic_dec_and_spin_lock(atomic, lock)
+
+#endif
diff --git a/include/linux/spinlock_types.h b/include/linux/spinlock_types.h
index 73548eb13a5d..10bac715ea96 100644
--- a/include/linux/spinlock_types.h
+++ b/include/linux/spinlock_types.h
@@ -9,80 +9,15 @@
  * Released under the General Public License (GPL).
  */
 
-#if defined(CONFIG_SMP)
-# include <asm/spinlock_types.h>
-#else
-# include <linux/spinlock_types_up.h>
-#endif
-
-#include <linux/lockdep.h>
-
-typedef struct raw_spinlock {
-       arch_spinlock_t raw_lock;
-#ifdef CONFIG_GENERIC_LOCKBREAK
-       unsigned int break_lock;
-#endif
-#ifdef CONFIG_DEBUG_SPINLOCK
-       unsigned int magic, owner_cpu;
-       void *owner;
-#endif
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-       struct lockdep_map dep_map;
-#endif
-} raw_spinlock_t;
-
-#define SPINLOCK_MAGIC         0xdead4ead
-
-#define SPINLOCK_OWNER_INIT    ((void *)-1L)
-
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-# define SPIN_DEP_MAP_INIT(lockname)   .dep_map = { .name = #lockname }
-#else
-# define SPIN_DEP_MAP_INIT(lockname)
-#endif
+#include <linux/spinlock_types_raw.h>
 
-#ifdef CONFIG_DEBUG_SPINLOCK
-# define SPIN_DEBUG_INIT(lockname)             \
-       .magic = SPINLOCK_MAGIC,                \
-       .owner_cpu = -1,                        \
-       .owner = SPINLOCK_OWNER_INIT,
+#ifndef CONFIG_PREEMPT_RT_FULL
+# include <linux/spinlock_types_nort.h>
+# include <linux/rwlock_types.h>
 #else
-# define SPIN_DEBUG_INIT(lockname)
+# include <linux/rtmutex.h>
+# include <linux/spinlock_types_rt.h>
+# include <linux/rwlock_types_rt.h>
 #endif
 
-#define __RAW_SPIN_LOCK_INITIALIZER(lockname)  \
-       {                                       \
-       .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED,  \
-       SPIN_DEBUG_INIT(lockname)               \
-       SPIN_DEP_MAP_INIT(lockname) }
-
-#define __RAW_SPIN_LOCK_UNLOCKED(lockname)     \
-       (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
-
-#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
-
-typedef struct spinlock {
-       union {
-               struct raw_spinlock rlock;
-
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
-               struct {
-                       u8 __padding[LOCK_PADSIZE];
-                       struct lockdep_map dep_map;
-               };
-#endif
-       };
-} spinlock_t;
-
-#define __SPIN_LOCK_INITIALIZER(lockname) \
-       { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
-
-#define __SPIN_LOCK_UNLOCKED(lockname) \
-       (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
-
-#define DEFINE_SPINLOCK(x)     spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
-
-#include <linux/rwlock_types.h>
-
 #endif /* __LINUX_SPINLOCK_TYPES_H */
diff --git a/include/linux/spinlock_types_nort.h b/include/linux/spinlock_types_nort.h
new file mode 100644
index 000000000000..f1dac1fb1d6a
--- /dev/null
+++ b/include/linux/spinlock_types_nort.h
@@ -0,0 +1,33 @@
+#ifndef __LINUX_SPINLOCK_TYPES_NORT_H
+#define __LINUX_SPINLOCK_TYPES_NORT_H
+
+#ifndef __LINUX_SPINLOCK_TYPES_H
+#error "Do not include directly. Include spinlock_types.h instead"
+#endif
+
+/*
+ * The non RT version maps spinlocks to raw_spinlocks
+ */
+typedef struct spinlock {
+       union {
+               struct raw_spinlock rlock;
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
+               struct {
+                       u8 __padding[LOCK_PADSIZE];
+                       struct lockdep_map dep_map;
+               };
+#endif
+       };
+} spinlock_t;
+
+#define __SPIN_LOCK_INITIALIZER(lockname) \
+       { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
+
+#define __SPIN_LOCK_UNLOCKED(lockname) \
+       (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
+
+#define DEFINE_SPINLOCK(x)     spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
+
+#endif
diff --git a/include/linux/spinlock_types_raw.h b/include/linux/spinlock_types_raw.h
new file mode 100644
index 000000000000..edffc4d53fc9
--- /dev/null
+++ b/include/linux/spinlock_types_raw.h
@@ -0,0 +1,56 @@
+#ifndef __LINUX_SPINLOCK_TYPES_RAW_H
+#define __LINUX_SPINLOCK_TYPES_RAW_H
+
+#if defined(CONFIG_SMP)
+# include <asm/spinlock_types.h>
+#else
+# include <linux/spinlock_types_up.h>
+#endif
+
+#include <linux/lockdep.h>
+
+typedef struct raw_spinlock {
+       arch_spinlock_t raw_lock;
+#ifdef CONFIG_GENERIC_LOCKBREAK
+       unsigned int break_lock;
+#endif
+#ifdef CONFIG_DEBUG_SPINLOCK
+       unsigned int magic, owner_cpu;
+       void *owner;
+#endif
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+       struct lockdep_map dep_map;
+#endif
+} raw_spinlock_t;
+
+#define SPINLOCK_MAGIC         0xdead4ead
+
+#define SPINLOCK_OWNER_INIT    ((void *)-1L)
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define SPIN_DEP_MAP_INIT(lockname)   .dep_map = { .name = #lockname }
+#else
+# define SPIN_DEP_MAP_INIT(lockname)
+#endif
+
+#ifdef CONFIG_DEBUG_SPINLOCK
+# define SPIN_DEBUG_INIT(lockname)             \
+       .magic = SPINLOCK_MAGIC,                \
+       .owner_cpu = -1,                        \
+       .owner = SPINLOCK_OWNER_INIT,
+#else
+# define SPIN_DEBUG_INIT(lockname)
+#endif
+
+#define __RAW_SPIN_LOCK_INITIALIZER(lockname)  \
+       {                                       \
+       .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED,  \
+       SPIN_DEBUG_INIT(lockname)               \
+       SPIN_DEP_MAP_INIT(lockname) }
+
+#define __RAW_SPIN_LOCK_UNLOCKED(lockname)     \
+       (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
+
+#define DEFINE_RAW_SPINLOCK(x) raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
+
+#endif
diff --git a/include/linux/spinlock_types_rt.h b/include/linux/spinlock_types_rt.h
new file mode 100644
index 000000000000..9fd431967abc
--- /dev/null
+++ b/include/linux/spinlock_types_rt.h
@@ -0,0 +1,51 @@
+#ifndef __LINUX_SPINLOCK_TYPES_RT_H
+#define __LINUX_SPINLOCK_TYPES_RT_H
+
+#ifndef __LINUX_SPINLOCK_TYPES_H
+#error "Do not include directly. Include spinlock_types.h instead"
+#endif
+
+#include <linux/cache.h>
+
+/*
+ * PREEMPT_RT: spinlocks - an RT mutex plus lock-break field:
+ */
+typedef struct spinlock {
+       struct rt_mutex         lock;
+       unsigned int            break_lock;
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+       struct lockdep_map      dep_map;
+#endif
+} spinlock_t;
+
+#ifdef CONFIG_DEBUG_RT_MUTEXES
+# define __RT_SPIN_INITIALIZER(name) \
+       { \
+       .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock), \
+       .save_state = 1, \
+       .file = __FILE__, \
+       .line = __LINE__ , \
+       }
+#else
+# define __RT_SPIN_INITIALIZER(name) \
+       {                                                               \
+       .wait_lock = __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock),          \
+       .save_state = 1, \
+       }
+#endif
+
+/*
+.wait_list = PLIST_HEAD_INIT_RAW((name).lock.wait_list, (name).lock.wait_lock)
+*/
+
+#define __SPIN_LOCK_UNLOCKED(name)                     \
+       { .lock = __RT_SPIN_INITIALIZER(name.lock),             \
+         SPIN_DEP_MAP_INIT(name) }
+
+#define __DEFINE_SPINLOCK(name) \
+       spinlock_t name = __SPIN_LOCK_UNLOCKED(name)
+
+#define DEFINE_SPINLOCK(name) \
+       spinlock_t name __cacheline_aligned_in_smp = __SPIN_LOCK_UNLOCKED(name)
+
+#endif
diff --git a/include/linux/srcu.h b/include/linux/srcu.h
index f5f80c5643ac..ec1a8f01563c 100644
--- a/include/linux/srcu.h
+++ b/include/linux/srcu.h
@@ -84,10 +84,10 @@ int init_srcu_struct(struct srcu_struct *sp);
 
 void process_srcu(struct work_struct *work);
 
-#define __SRCU_STRUCT_INIT(name)                                       \
+#define __SRCU_STRUCT_INIT(name, pcpu_name)                            \
        {                                                               \
                .completed = -300,                                      \
-               .per_cpu_ref = &name##_srcu_array,                      \
+               .per_cpu_ref = &pcpu_name,                              \
                .queue_lock = __SPIN_LOCK_UNLOCKED(name.queue_lock),    \
                .running = false,                                       \
                .batch_queue = RCU_BATCH_INIT(name.batch_queue),        \
@@ -104,7 +104,7 @@ void process_srcu(struct work_struct *work);
  */
 #define __DEFINE_SRCU(name, is_static)                                 \
        static DEFINE_PER_CPU(struct srcu_struct_array, name##_srcu_array);\
-       is_static struct srcu_struct name = __SRCU_STRUCT_INIT(name)
+       is_static struct srcu_struct name = __SRCU_STRUCT_INIT(name, name##_srcu_array)
 #define DEFINE_SRCU(name)              __DEFINE_SRCU(name, /* not static */)
 #define DEFINE_STATIC_SRCU(name)       __DEFINE_SRCU(name, static)
 
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 8b6ec7ef0854..9b77d4cc929f 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -194,6 +194,12 @@ struct platform_freeze_ops {
        void (*end)(void);
 };
 
+#if defined(CONFIG_SUSPEND) || defined(CONFIG_HIBERNATION)
+extern bool pm_in_action;
+#else
+# define pm_in_action false
+#endif
+
 #ifdef CONFIG_SUSPEND
 /**
  * suspend_set_ops - set platform dependent suspend operations
diff --git a/include/linux/swait.h b/include/linux/swait.h
new file mode 100644
index 000000000000..83f004a72320
--- /dev/null
+++ b/include/linux/swait.h
@@ -0,0 +1,173 @@
+#ifndef _LINUX_SWAIT_H
+#define _LINUX_SWAIT_H
+
+#include <linux/list.h>
+#include <linux/stddef.h>
+#include <linux/spinlock.h>
+#include <asm/current.h>
+
+/*
+ * Simple wait queues
+ *
+ * While these are very similar to the other/complex wait queues (wait.h) the
+ * most important difference is that the simple waitqueue allows for
+ * deterministic behaviour -- IOW it has strictly bounded IRQ and lock hold
+ * times.
+ *
+ * In order to make this so, we had to drop a fair number of features of the
+ * other waitqueue code; notably:
+ *
+ *  - mixing INTERRUPTIBLE and UNINTERRUPTIBLE sleeps on the same waitqueue;
+ *    all wakeups are TASK_NORMAL in order to avoid O(n) lookups for the right
+ *    sleeper state.
+ *
+ *  - the exclusive mode; because this requires preserving the list order
+ *    and this is hard.
+ *
+ *  - custom wake functions; because you cannot give any guarantees about
+ *    random code.
+ *
+ * As a side effect of this; the data structures are slimmer.
+ *
+ * One would recommend using this wait queue where possible.
+ */
+
+struct task_struct;
+
+struct swait_queue_head {
+       raw_spinlock_t          lock;
+       struct list_head        task_list;
+};
+
+struct swait_queue {
+       struct task_struct      *task;
+       struct list_head        task_list;
+};
+
+#define __SWAITQUEUE_INITIALIZER(name) {                               \
+       .task           = current,                                      \
+       .task_list      = LIST_HEAD_INIT((name).task_list),             \
+}
+
+#define DECLARE_SWAITQUEUE(name)                                       \
+       struct swait_queue name = __SWAITQUEUE_INITIALIZER(name)
+
+#define __SWAIT_QUEUE_HEAD_INITIALIZER(name) {                         \
+       .lock           = __RAW_SPIN_LOCK_UNLOCKED(name.lock),          \
+       .task_list      = LIST_HEAD_INIT((name).task_list),             \
+}
+
+#define DECLARE_SWAIT_QUEUE_HEAD(name)                                 \
+       struct swait_queue_head name = __SWAIT_QUEUE_HEAD_INITIALIZER(name)
+
+extern void __init_swait_queue_head(struct swait_queue_head *q, const char *name,
+                                   struct lock_class_key *key);
+
+#define init_swait_queue_head(q)                               \
+       do {                                                    \
+               static struct lock_class_key __key;             \
+               __init_swait_queue_head((q), #q, &__key);       \
+       } while (0)
+
+#ifdef CONFIG_LOCKDEP
+# define __SWAIT_QUEUE_HEAD_INIT_ONSTACK(name)                 \
+       ({ init_swait_queue_head(&name); name; })
+# define DECLARE_SWAIT_QUEUE_HEAD_ONSTACK(name)                        \
+       struct swait_queue_head name = __SWAIT_QUEUE_HEAD_INIT_ONSTACK(name)
+#else
+# define DECLARE_SWAIT_QUEUE_HEAD_ONSTACK(name)                        \
+       DECLARE_SWAIT_QUEUE_HEAD(name)
+#endif
+
+static inline int swait_active(struct swait_queue_head *q)
+{
+       return !list_empty(&q->task_list);
+}
+
+extern void swake_up(struct swait_queue_head *q);
+extern void swake_up_all(struct swait_queue_head *q);
+extern void swake_up_locked(struct swait_queue_head *q);
+extern void swake_up_all_locked(struct swait_queue_head *q);
+
+extern void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait);
+extern void prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait, int state);
+extern long prepare_to_swait_event(struct swait_queue_head *q, struct swait_queue *wait, int state);
+
+extern void __finish_swait(struct swait_queue_head *q, struct swait_queue *wait);
+extern void finish_swait(struct swait_queue_head *q, struct swait_queue *wait);
+
+/* as per ___wait_event() but for swait, therefore "exclusive == 0" */
+#define ___swait_event(wq, condition, state, ret, cmd)                 \
+({                                                                     \
+       struct swait_queue __wait;                                      \
+       long __ret = ret;                                               \
+                                                                       \
+       INIT_LIST_HEAD(&__wait.task_list);                              \
+       for (;;) {                                                      \
+               long __int = prepare_to_swait_event(&wq, &__wait, state);\
+                                                                       \
+               if (condition)                                          \
+                       break;                                          \
+                                                                       \
+               if (___wait_is_interruptible(state) && __int) {         \
+                       __ret = __int;                                  \
+                       break;                                          \
+               }                                                       \
+                                                                       \
+               cmd;                                                    \
+       }                                                               \
+       finish_swait(&wq, &__wait);                                     \
+       __ret;                                                          \
+})
+
+#define __swait_event(wq, condition)                                   \
+       (void)___swait_event(wq, condition, TASK_UNINTERRUPTIBLE, 0,    \
+                           schedule())
+
+#define swait_event(wq, condition)                                     \
+do {                                                                   \
+       if (condition)                                                  \
+               break;                                                  \
+       __swait_event(wq, condition);                                   \
+} while (0)
+
+#define __swait_event_timeout(wq, condition, timeout)                  \
+       ___swait_event(wq, ___wait_cond_timeout(condition),             \
+                     TASK_UNINTERRUPTIBLE, timeout,                    \
+                     __ret = schedule_timeout(__ret))
+
+#define swait_event_timeout(wq, condition, timeout)                    \
+({                                                                     \
+       long __ret = timeout;                                           \
+       if (!___wait_cond_timeout(condition))                           \
+               __ret = __swait_event_timeout(wq, condition, timeout);  \
+       __ret;                                                          \
+})
+
+#define __swait_event_interruptible(wq, condition)                     \
+       ___swait_event(wq, condition, TASK_INTERRUPTIBLE, 0,            \
+                     schedule())
+
+#define swait_event_interruptible(wq, condition)                       \
+({                                                                     \
+       int __ret = 0;                                                  \
+       if (!(condition))                                               \
+               __ret = __swait_event_interruptible(wq, condition);     \
+       __ret;                                                          \
+})
+
+#define __swait_event_interruptible_timeout(wq, condition, timeout)    \
+       ___swait_event(wq, ___wait_cond_timeout(condition),             \
+                     TASK_INTERRUPTIBLE, timeout,                      \
+                     __ret = schedule_timeout(__ret))
+
+#define swait_event_interruptible_timeout(wq, condition, timeout)      \
+({                                                                     \
+       long __ret = timeout;                                           \
+       if (!___wait_cond_timeout(condition))                           \
+               __ret = __swait_event_interruptible_timeout(wq,         \
+                                               condition, timeout);    \
+       __ret;                                                          \
+})
+
+#endif /* _LINUX_SWAIT_H */
diff --git a/include/linux/swap.h b/include/linux/swap.h
index d8ca2eaa3a8b..19e038054914 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -11,6 +11,7 @@
 #include <linux/fs.h>
 #include <linux/atomic.h>
 #include <linux/page-flags.h>
+#include <linux/locallock.h>
 #include <asm/page.h>
 
 struct notifier_block;
@@ -252,7 +253,8 @@ struct swap_info_struct {
 void *workingset_eviction(struct address_space *mapping, struct page *page);
 bool workingset_refault(void *shadow);
 void workingset_activation(struct page *page);
-extern struct list_lru workingset_shadow_nodes;
+extern struct list_lru __workingset_shadow_nodes;
+DECLARE_LOCAL_IRQ_LOCK(workingset_shadow_lock);
 
 static inline unsigned int workingset_node_pages(struct radix_tree_node *node)
 {
@@ -298,6 +300,7 @@ extern unsigned long nr_free_pagecache_pages(void);
 
 
 /* linux/mm/swap.c */
+DECLARE_LOCAL_IRQ_LOCK(swapvec_lock);
 extern void lru_cache_add(struct page *);
 extern void lru_cache_add_anon(struct page *page);
 extern void lru_cache_add_file(struct page *page);
diff --git a/include/linux/swork.h b/include/linux/swork.h
new file mode 100644
index 000000000000..f175fa9a6016
--- /dev/null
+++ b/include/linux/swork.h
@@ -0,0 +1,24 @@
+#ifndef _LINUX_SWORK_H
+#define _LINUX_SWORK_H
+
+#include <linux/list.h>
+
+struct swork_event {
+       struct list_head item;
+       unsigned long flags;
+       void (*func)(struct swork_event *);
+};
+
+static inline void INIT_SWORK(struct swork_event *event,
+                             void (*func)(struct swork_event *))
+{
+       event->flags = 0;
+       event->func = func;
+}
+
+bool swork_queue(struct swork_event *sev);
+
+int swork_get(void);
+void swork_put(void);
+
+#endif /* _LINUX_SWORK_H */
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index ff307b548ed3..be9f9dc6a4e1 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -102,7 +102,17 @@ static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
 #define test_thread_flag(flag) \
        test_ti_thread_flag(current_thread_info(), flag)
 
-#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
+#ifdef CONFIG_PREEMPT_LAZY
+#define tif_need_resched()     (test_thread_flag(TIF_NEED_RESCHED) || \
+                                test_thread_flag(TIF_NEED_RESCHED_LAZY))
+#define tif_need_resched_now() (test_thread_flag(TIF_NEED_RESCHED))
+#define tif_need_resched_lazy()        test_thread_flag(TIF_NEED_RESCHED_LAZY))
+
+#else
+#define tif_need_resched()     test_thread_flag(TIF_NEED_RESCHED)
+#define tif_need_resched_now() test_thread_flag(TIF_NEED_RESCHED)
+#define tif_need_resched_lazy()        0
+#endif
 
 #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
 /*
diff --git a/include/linux/timer.h b/include/linux/timer.h
index 61aa61dc410c..299d2b78591f 100644
--- a/include/linux/timer.h
+++ b/include/linux/timer.h
@@ -225,7 +225,7 @@ extern void add_timer(struct timer_list *timer);
 
 extern int try_to_del_timer_sync(struct timer_list *timer);
 
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
   extern int del_timer_sync(struct timer_list *timer);
 #else
 # define del_timer_sync(t)             del_timer(t)
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 311176f290b2..62d4bff5f477 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -66,6 +66,9 @@ struct trace_entry {
        unsigned char           flags;
        unsigned char           preempt_count;
        int                     pid;
+       unsigned short          migrate_disable;
+       unsigned short          padding;
+       unsigned char           preempt_lazy_count;
 };
 
 #define TRACE_EVENT_TYPE_MAX                                           \
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index 558129af828a..cf5c472bbc79 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -24,6 +24,7 @@ static __always_inline void pagefault_disabled_dec(void)
  */
 static inline void pagefault_disable(void)
 {
+       migrate_disable();
        pagefault_disabled_inc();
        /*
         * make sure to have issued the store before a pagefault
@@ -40,6 +41,7 @@ static inline void pagefault_enable(void)
         */
        barrier();
        pagefault_disabled_dec();
+       migrate_enable();
 }
 
 /*
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 4a29c75b146e..0a294e950df8 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -27,6 +27,7 @@
 #include <linux/errno.h>
 #include <linux/rbtree.h>
 #include <linux/types.h>
+#include <linux/wait.h>
 
 struct vm_area_struct;
 struct mm_struct;
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 3e5d9075960f..7eaa847cd5a5 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -33,7 +33,9 @@ DECLARE_PER_CPU(struct vm_event_state, vm_event_states);
  */
 static inline void __count_vm_event(enum vm_event_item item)
 {
+       preempt_disable_rt();
        raw_cpu_inc(vm_event_states.event[item]);
+       preempt_enable_rt();
 }
 
 static inline void count_vm_event(enum vm_event_item item)
@@ -43,7 +45,9 @@ static inline void count_vm_event(enum vm_event_item item)
 
 static inline void __count_vm_events(enum vm_event_item item, long delta)
 {
+       preempt_disable_rt();
        raw_cpu_add(vm_event_states.event[item], delta);
+       preempt_enable_rt();
 }
 
 static inline void count_vm_events(enum vm_event_item item, long delta)
diff --git a/include/linux/wait.h b/include/linux/wait.h
index 513b36f04dfd..981c8a840f96 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -8,6 +8,7 @@
 #include <linux/spinlock.h>
 #include <asm/current.h>
 #include <uapi/linux/wait.h>
+#include <linux/atomic.h>
 
 typedef struct __wait_queue wait_queue_t;
 typedef int (*wait_queue_func_t)(wait_queue_t *wait, unsigned mode, int flags, void *key);
diff --git a/include/net/dst.h b/include/net/dst.h
index e4f450617919..16cd3ef62202 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -443,7 +443,7 @@ static inline void dst_confirm(struct dst_entry *dst)
 static inline int dst_neigh_output(struct dst_entry *dst, struct neighbour *n,
                                   struct sk_buff *skb)
 {
-       const struct hh_cache *hh;
+       struct hh_cache *hh;
 
        if (dst->pending_confirm) {
                unsigned long now = jiffies;
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 8b683841e574..bf656008f6e7 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -446,7 +446,7 @@ static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb)
 }
 #endif
 
-static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb)
+static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb)
 {
        unsigned int seq;
        int hh_len;
@@ -501,7 +501,7 @@ struct neighbour_cb {
 
 #define NEIGH_CB(skb)  ((struct neighbour_cb *)(skb)->cb)
 
-static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n,
+static inline void neigh_ha_snapshot(char *dst, struct neighbour *n,
                                     const struct net_device *dev)
 {
        unsigned int seq;
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index c68926b4899c..dd0751e76065 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -70,6 +70,7 @@ struct netns_ipv4 {
 
        int sysctl_icmp_echo_ignore_all;
        int sysctl_icmp_echo_ignore_broadcasts;
+       int sysctl_icmp_echo_sysrq;
        int sysctl_icmp_ignore_bogus_error_responses;
        int sysctl_icmp_ratelimit;
        int sysctl_icmp_ratemask;
diff --git a/include/trace/events/hist.h b/include/trace/events/hist.h
new file mode 100644
index 000000000000..f7710de1b1f3
--- /dev/null
+++ b/include/trace/events/hist.h
@@ -0,0 +1,73 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM hist
+
+#if !defined(_TRACE_HIST_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_HIST_H
+
+#include "latency_hist.h"
+#include <linux/tracepoint.h>
+
+#if !defined(CONFIG_PREEMPT_OFF_HIST) && !defined(CONFIG_INTERRUPT_OFF_HIST)
+#define trace_preemptirqsoff_hist(a, b)
+#define trace_preemptirqsoff_hist_rcuidle(a, b)
+#else
+TRACE_EVENT(preemptirqsoff_hist,
+
+       TP_PROTO(int reason, int starthist),
+
+       TP_ARGS(reason, starthist),
+
+       TP_STRUCT__entry(
+               __field(int,    reason)
+               __field(int,    starthist)
+       ),
+
+       TP_fast_assign(
+               __entry->reason         = reason;
+               __entry->starthist      = starthist;
+       ),
+
+       TP_printk("reason=%s starthist=%s", getaction(__entry->reason),
+                 __entry->starthist ? "start" : "stop")
+);
+#endif
+
+#ifndef CONFIG_MISSED_TIMER_OFFSETS_HIST
+#define trace_hrtimer_interrupt(a, b, c, d)
+#else
+TRACE_EVENT(hrtimer_interrupt,
+
+       TP_PROTO(int cpu, long long offset, struct task_struct *curr,
+               struct task_struct *task),
+
+       TP_ARGS(cpu, offset, curr, task),
+
+       TP_STRUCT__entry(
+               __field(int,            cpu)
+               __field(long long,      offset)
+               __array(char,           ccomm,  TASK_COMM_LEN)
+               __field(int,            cprio)
+               __array(char,           tcomm,  TASK_COMM_LEN)
+               __field(int,            tprio)
+       ),
+
+       TP_fast_assign(
+               __entry->cpu    = cpu;
+               __entry->offset = offset;
+               memcpy(__entry->ccomm, curr->comm, TASK_COMM_LEN);
+               __entry->cprio  = curr->prio;
+               memcpy(__entry->tcomm, task != NULL ? task->comm : "<none>",
+                       task != NULL ? TASK_COMM_LEN : 7);
+               __entry->tprio  = task != NULL ? task->prio : -1;
+       ),
+
+       TP_printk("cpu=%d offset=%lld curr=%s[%d] thread=%s[%d]",
+               __entry->cpu, __entry->offset, __entry->ccomm,
+               __entry->cprio, __entry->tcomm, __entry->tprio)
+);
+#endif
+
+#endif /* _TRACE_HIST_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/include/trace/events/latency_hist.h b/include/trace/events/latency_hist.h
new file mode 100644
index 000000000000..d3f2fbd560b1
--- /dev/null
+++ b/include/trace/events/latency_hist.h
@@ -0,0 +1,29 @@
+#ifndef _LATENCY_HIST_H
+#define _LATENCY_HIST_H
+
+enum hist_action {
+       IRQS_ON,
+       PREEMPT_ON,
+       TRACE_STOP,
+       IRQS_OFF,
+       PREEMPT_OFF,
+       TRACE_START,
+};
+
+static char *actions[] = {
+       "IRQS_ON",
+       "PREEMPT_ON",
+       "TRACE_STOP",
+       "IRQS_OFF",
+       "PREEMPT_OFF",
+       "TRACE_START",
+};
+
+static inline char *getaction(int action)
+{
+       if (action >= 0 && action <= sizeof(actions)/sizeof(actions[0]))
+               return actions[action];
+       return "unknown";
+}
+
+#endif /* _LATENCY_HIST_H */
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index fff846b512e6..73614ce1d204 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -134,58 +134,28 @@ DEFINE_EVENT(writeback_dirty_inode_template, writeback_dirty_inode,
 #ifdef CREATE_TRACE_POINTS
 #ifdef CONFIG_CGROUP_WRITEBACK
 
-static inline size_t __trace_wb_cgroup_size(struct bdi_writeback *wb)
+static inline unsigned int __trace_wb_assign_cgroup(struct bdi_writeback *wb)
 {
-       return kernfs_path_len(wb->memcg_css->cgroup->kn) + 1;
+       return wb->memcg_css->cgroup->kn->ino;
 }
 
-static inline void __trace_wb_assign_cgroup(char *buf, struct bdi_writeback *wb)
-{
-       struct cgroup *cgrp = wb->memcg_css->cgroup;
-       char *path;
-
-       path = cgroup_path(cgrp, buf, kernfs_path_len(cgrp->kn) + 1);
-       WARN_ON_ONCE(path != buf);
-}
-
-static inline size_t __trace_wbc_cgroup_size(struct writeback_control *wbc)
-{
-       if (wbc->wb)
-               return __trace_wb_cgroup_size(wbc->wb);
-       else
-               return 2;
-}
-
-static inline void __trace_wbc_assign_cgroup(char *buf,
-                                            struct writeback_control *wbc)
+static inline unsigned int __trace_wbc_assign_cgroup(struct writeback_control *wbc)
 {
        if (wbc->wb)
-               __trace_wb_assign_cgroup(buf, wbc->wb);
+               return __trace_wb_assign_cgroup(wbc->wb);
        else
-               strcpy(buf, "/");
+               return -1U;
 }
-
 #else  /* CONFIG_CGROUP_WRITEBACK */
 
-static inline size_t __trace_wb_cgroup_size(struct bdi_writeback *wb)
-{
-       return 2;
-}
-
-static inline void __trace_wb_assign_cgroup(char *buf, struct bdi_writeback *wb)
-{
-       strcpy(buf, "/");
-}
-
-static inline size_t __trace_wbc_cgroup_size(struct writeback_control *wbc)
+static inline unsigned int __trace_wb_assign_cgroup(struct bdi_writeback *wb)
 {
-       return 2;
+       return -1U;
 }
 
-static inline void __trace_wbc_assign_cgroup(char *buf,
-                                            struct writeback_control *wbc)
+static inline unsigned int __trace_wbc_assign_cgroup(struct writeback_control *wbc)
 {
-       strcpy(buf, "/");
+       return -1U;
 }
 
 #endif /* CONFIG_CGROUP_WRITEBACK */
@@ -201,7 +171,7 @@ DECLARE_EVENT_CLASS(writeback_write_inode_template,
                __array(char, name, 32)
                __field(unsigned long, ino)
                __field(int, sync_mode)
-               __dynamic_array(char, cgroup, __trace_wbc_cgroup_size(wbc))
+               __field(unsigned int, cgroup_ino)
        ),
 
        TP_fast_assign(
@@ -209,14 +179,14 @@ DECLARE_EVENT_CLASS(writeback_write_inode_template,
                        dev_name(inode_to_bdi(inode)->dev), 32);
                __entry->ino            = inode->i_ino;
                __entry->sync_mode      = wbc->sync_mode;
-               __trace_wbc_assign_cgroup(__get_str(cgroup), wbc);
+               __entry->cgroup_ino     = __trace_wbc_assign_cgroup(wbc);
        ),
 
-       TP_printk("bdi %s: ino=%lu sync_mode=%d cgroup=%s",
+       TP_printk("bdi %s: ino=%lu sync_mode=%d cgroup_ino=%u",
                __entry->name,
                __entry->ino,
                __entry->sync_mode,
-               __get_str(cgroup)
+               __entry->cgroup_ino
        )
 );
 
@@ -246,7 +216,7 @@ DECLARE_EVENT_CLASS(writeback_work_class,
                __field(int, range_cyclic)
                __field(int, for_background)
                __field(int, reason)
-               __dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
+               __field(unsigned int, cgroup_ino)
        ),
        TP_fast_assign(
                strncpy(__entry->name,
@@ -258,10 +228,10 @@ DECLARE_EVENT_CLASS(writeback_work_class,
                __entry->range_cyclic = work->range_cyclic;
                __entry->for_background = work->for_background;
                __entry->reason = work->reason;
-               __trace_wb_assign_cgroup(__get_str(cgroup), wb);
+               __entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
        ),
        TP_printk("bdi %s: sb_dev %d:%d nr_pages=%ld sync_mode=%d "
-                 "kupdate=%d range_cyclic=%d background=%d reason=%s cgroup=%s",
+                 "kupdate=%d range_cyclic=%d background=%d reason=%s cgroup_ino=%u",
                  __entry->name,
                  MAJOR(__entry->sb_dev), MINOR(__entry->sb_dev),
                  __entry->nr_pages,
@@ -270,7 +240,7 @@ DECLARE_EVENT_CLASS(writeback_work_class,
                  __entry->range_cyclic,
                  __entry->for_background,
                  __print_symbolic(__entry->reason, WB_WORK_REASON),
-                 __get_str(cgroup)
+                 __entry->cgroup_ino
        )
 );
 #define DEFINE_WRITEBACK_WORK_EVENT(name) \
@@ -300,15 +270,15 @@ DECLARE_EVENT_CLASS(writeback_class,
        TP_ARGS(wb),
        TP_STRUCT__entry(
                __array(char, name, 32)
-               __dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
+               __field(unsigned int, cgroup_ino)
        ),
        TP_fast_assign(
                strncpy(__entry->name, dev_name(wb->bdi->dev), 32);
-               __trace_wb_assign_cgroup(__get_str(cgroup), wb);
+               __entry->cgroup_ino = __trace_wb_assign_cgroup(wb);
        ),
-       TP_printk("bdi %s: cgroup=%s",
+       TP_printk("bdi %s: cgroup_ino=%u",
                  __entry->name,
-                 __get_str(cgroup)
+                 __entry->cgroup_ino
        )
 );
 #define DEFINE_WRITEBACK_EVENT(name) \
@@ -347,7 +317,7 @@ DECLARE_EVENT_CLASS(wbc_class,
                __field(int, range_cyclic)
                __field(long, range_start)
                __field(long, range_end)
-               __dynamic_array(char, cgroup, __trace_wbc_cgroup_size(wbc))
+               __field(unsigned int, cgroup_ino)
        ),
 
        TP_fast_assign(
@@ -361,12 +331,12 @@ DECLARE_EVENT_CLASS(wbc_class,
                __entry->range_cyclic   = wbc->range_cyclic;
                __entry->range_start    = (long)wbc->range_start;
                __entry->range_end      = (long)wbc->range_end;
-               __trace_wbc_assign_cgroup(__get_str(cgroup), wbc);
+               __entry->cgroup_ino     = __trace_wbc_assign_cgroup(wbc);
        ),
 
        TP_printk("bdi %s: towrt=%ld skip=%ld mode=%d kupd=%d "
                "bgrd=%d reclm=%d cyclic=%d "
-               "start=0x%lx end=0x%lx cgroup=%s",
+               "start=0x%lx end=0x%lx cgroup_ino=%u",
                __entry->name,
                __entry->nr_to_write,
                __entry->pages_skipped,
@@ -377,7 +347,7 @@ DECLARE_EVENT_CLASS(wbc_class,
                __entry->range_cyclic,
                __entry->range_start,
                __entry->range_end,
-               __get_str(cgroup)
+               __entry->cgroup_ino
        )
 )
 
@@ -398,7 +368,7 @@ TRACE_EVENT(writeback_queue_io,
                __field(long,           age)
                __field(int,            moved)
                __field(int,            reason)
-               __dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
+               __field(unsigned int,   cgroup_ino)
        ),
        TP_fast_assign(
                unsigned long *older_than_this = work->older_than_this;
@@ -408,15 +378,15 @@ TRACE_EVENT(writeback_queue_io,
                                  (jiffies - *older_than_this) * 1000 / HZ : -1;
                __entry->moved  = moved;
                __entry->reason = work->reason;
-               __trace_wb_assign_cgroup(__get_str(cgroup), wb);
+               __entry->cgroup_ino     = __trace_wb_assign_cgroup(wb);
        ),
-       TP_printk("bdi %s: older=%lu age=%ld enqueue=%d reason=%s cgroup=%s",
+       TP_printk("bdi %s: older=%lu age=%ld enqueue=%d reason=%s cgroup_ino=%u",
                __entry->name,
                __entry->older, /* older_than_this in jiffies */
                __entry->age,   /* older_than_this in relative milliseconds */
                __entry->moved,
                __print_symbolic(__entry->reason, WB_WORK_REASON),
-               __get_str(cgroup)
+               __entry->cgroup_ino
        )
 );
 
@@ -484,7 +454,7 @@ TRACE_EVENT(bdi_dirty_ratelimit,
                __field(unsigned long,  dirty_ratelimit)
                __field(unsigned long,  task_ratelimit)
                __field(unsigned long,  balanced_dirty_ratelimit)
-               __dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
+               __field(unsigned int,   cgroup_ino)
        ),
 
        TP_fast_assign(
@@ -496,13 +466,13 @@ TRACE_EVENT(bdi_dirty_ratelimit,
                __entry->task_ratelimit = KBps(task_ratelimit);
                __entry->balanced_dirty_ratelimit =
                                        KBps(wb->balanced_dirty_ratelimit);
-               __trace_wb_assign_cgroup(__get_str(cgroup), wb);
+               __entry->cgroup_ino     = __trace_wb_assign_cgroup(wb);
        ),
 
        TP_printk("bdi %s: "
                  "write_bw=%lu awrite_bw=%lu dirty_rate=%lu "
                  "dirty_ratelimit=%lu task_ratelimit=%lu "
-                 "balanced_dirty_ratelimit=%lu cgroup=%s",
+                 "balanced_dirty_ratelimit=%lu cgroup_ino=%u",
                  __entry->bdi,
                  __entry->write_bw,            /* write bandwidth */
                  __entry->avg_write_bw,        /* avg write bandwidth */
@@ -510,7 +480,7 @@ TRACE_EVENT(bdi_dirty_ratelimit,
                  __entry->dirty_ratelimit,     /* base ratelimit */
                  __entry->task_ratelimit, /* ratelimit with position control */
                  __entry->balanced_dirty_ratelimit, /* the balanced ratelimit */
-                 __get_str(cgroup)
+                 __entry->cgroup_ino
        )
 );
 
@@ -548,7 +518,7 @@ TRACE_EVENT(balance_dirty_pages,
                __field(         long,  pause)
                __field(unsigned long,  period)
                __field(         long,  think)
-               __dynamic_array(char, cgroup, __trace_wb_cgroup_size(wb))
+               __field(unsigned int,   cgroup_ino)
        ),
 
        TP_fast_assign(
@@ -571,7 +541,7 @@ TRACE_EVENT(balance_dirty_pages,
                __entry->period         = period * 1000 / HZ;
                __entry->pause          = pause * 1000 / HZ;
                __entry->paused         = (jiffies - start_time) * 1000 / HZ;
-               __trace_wb_assign_cgroup(__get_str(cgroup), wb);
+               __entry->cgroup_ino     = __trace_wb_assign_cgroup(wb);
        ),
 
 
@@ -580,7 +550,7 @@ TRACE_EVENT(balance_dirty_pages,
                  "bdi_setpoint=%lu bdi_dirty=%lu "
                  "dirty_ratelimit=%lu task_ratelimit=%lu "
                  "dirtied=%u dirtied_pause=%u "
-                 "paused=%lu pause=%ld period=%lu think=%ld cgroup=%s",
+                 "paused=%lu pause=%ld period=%lu think=%ld cgroup_ino=%u",
                  __entry->bdi,
                  __entry->limit,
                  __entry->setpoint,
@@ -595,7 +565,7 @@ TRACE_EVENT(balance_dirty_pages,
                  __entry->pause,       /* ms */
                  __entry->period,      /* ms */
                  __entry->think,       /* ms */
-                 __get_str(cgroup)
+                 __entry->cgroup_ino
          )
 );
 
@@ -609,8 +579,7 @@ TRACE_EVENT(writeback_sb_inodes_requeue,
                __field(unsigned long, ino)
                __field(unsigned long, state)
                __field(unsigned long, dirtied_when)
-               __dynamic_array(char, cgroup,
-                               __trace_wb_cgroup_size(inode_to_wb(inode)))
+               __field(unsigned int, cgroup_ino)
        ),
 
        TP_fast_assign(
@@ -619,16 +588,16 @@ TRACE_EVENT(writeback_sb_inodes_requeue,
                __entry->ino            = inode->i_ino;
                __entry->state          = inode->i_state;
                __entry->dirtied_when   = inode->dirtied_when;
-               __trace_wb_assign_cgroup(__get_str(cgroup), inode_to_wb(inode));
+               __entry->cgroup_ino     = __trace_wb_assign_cgroup(inode_to_wb(inode));
        ),
 
-       TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu cgroup=%s",
+       TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu cgroup_ino=%u",
                  __entry->name,
                  __entry->ino,
                  show_inode_state(__entry->state),
                  __entry->dirtied_when,
                  (jiffies - __entry->dirtied_when) / HZ,
-                 __get_str(cgroup)
+                 __entry->cgroup_ino
        )
 );
 
@@ -684,7 +653,7 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
                __field(unsigned long, writeback_index)
                __field(long, nr_to_write)
                __field(unsigned long, wrote)
-               __dynamic_array(char, cgroup, __trace_wbc_cgroup_size(wbc))
+               __field(unsigned int, cgroup_ino)
        ),
 
        TP_fast_assign(
@@ -696,11 +665,11 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
                __entry->writeback_index = inode->i_mapping->writeback_index;
                __entry->nr_to_write    = nr_to_write;
                __entry->wrote          = nr_to_write - wbc->nr_to_write;
-               __trace_wbc_assign_cgroup(__get_str(cgroup), wbc);
+               __entry->cgroup_ino     = __trace_wbc_assign_cgroup(wbc);
        ),
 
        TP_printk("bdi %s: ino=%lu state=%s dirtied_when=%lu age=%lu "
-                 "index=%lu to_write=%ld wrote=%lu cgroup=%s",
+                 "index=%lu to_write=%ld wrote=%lu cgroup_ino=%u",
                  __entry->name,
                  __entry->ino,
                  show_inode_state(__entry->state),
@@ -709,7 +678,7 @@ DECLARE_EVENT_CLASS(writeback_single_inode_template,
                  __entry->writeback_index,
                  __entry->nr_to_write,
                  __entry->wrote,
-                 __get_str(cgroup)
+                 __entry->cgroup_ino
        )
 );
 
diff --git a/init/Kconfig b/init/Kconfig
index 235c7a2c0d20..a7c81c0911da 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -498,7 +498,7 @@ config TINY_RCU
 
 config RCU_EXPERT
        bool "Make expert-level adjustments to RCU configuration"
-       default n
+       default y if PREEMPT_RT_FULL
        help
          This option needs to be enabled if you wish to make
          expert-level adjustments to RCU configuration.  By default,
@@ -614,7 +614,7 @@ config RCU_FANOUT_LEAF
 
 config RCU_FAST_NO_HZ
        bool "Accelerate last non-dyntick-idle CPU's grace periods"
-       depends on NO_HZ_COMMON && SMP && RCU_EXPERT
+       depends on NO_HZ_COMMON && SMP && RCU_EXPERT && !PREEMPT_RT_FULL
        default n
        help
          This option permits CPUs to enter dynticks-idle state even if
@@ -641,7 +641,7 @@ config TREE_RCU_TRACE
 config RCU_BOOST
        bool "Enable RCU priority boosting"
        depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT
-       default n
+       default y if PREEMPT_RT_FULL
        help
          This option boosts the priority of preempted RCU readers that
          block the current preemptible RCU grace period for too long.
@@ -1106,6 +1106,7 @@ config CFS_BANDWIDTH
 config RT_GROUP_SCHED
        bool "Group scheduling for SCHED_RR/FIFO"
        depends on CGROUP_SCHED
+       depends on !PREEMPT_RT_FULL
        default n
        help
          This feature lets you explicitly allocate real CPU bandwidth
@@ -1719,6 +1720,7 @@ choice
 
 config SLAB
        bool "SLAB"
+       depends on !PREEMPT_RT_FULL
        help
          The regular slab allocator that is established and known to work
          well in all environments. It organizes cache hot objects in
@@ -1737,6 +1739,7 @@ config SLUB
 config SLOB
        depends on EXPERT
        bool "SLOB (Simple Allocator)"
+       depends on !PREEMPT_RT_FULL
        help
           SLOB replaces the stock allocator with a drastically simpler
           allocator. SLOB is generally more space efficient but
@@ -1746,7 +1749,7 @@ endchoice
 
 config SLUB_CPU_PARTIAL
        default y
-       depends on SLUB && SMP
+       depends on SLUB && SMP && !PREEMPT_RT_FULL
        bool "SLUB per cpu partial cache"
        help
          Per cpu partial caches accellerate objects allocation and freeing
diff --git a/init/Makefile b/init/Makefile
index 7bc47ee31c36..88cf473554e0 100644
--- a/init/Makefile
+++ b/init/Makefile
@@ -33,4 +33,4 @@ $(obj)/version.o: include/generated/compile.h
 include/generated/compile.h: FORCE
        @$($(quiet)chk_compile.h)
        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
-       "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CC) $(KBUILD_CFLAGS)"
+       "$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CONFIG_PREEMPT_RT_FULL)" "$(CC) $(KBUILD_CFLAGS)"
diff --git a/init/main.c b/init/main.c
index 49926d95442f..995cbb8d09b6 100644
--- a/init/main.c
+++ b/init/main.c
@@ -532,6 +532,7 @@ asmlinkage __visible void __init start_kernel(void)
        setup_command_line(command_line);
        setup_nr_cpu_ids();
        setup_per_cpu_areas();
+       softirq_early_init();
        smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
 
        build_all_zonelists(NULL, NULL);
diff --git a/ipc/msg.c b/ipc/msg.c
index c6521c205cb4..996d89023552 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -183,20 +183,14 @@ static void ss_wakeup(struct list_head *h, int kill)
        }
 }
 
-static void expunge_all(struct msg_queue *msq, int res)
+static void expunge_all(struct msg_queue *msq, int res,
+                       struct wake_q_head *wake_q)
 {
        struct msg_receiver *msr, *t;
 
        list_for_each_entry_safe(msr, t, &msq->q_receivers, r_list) {
-               msr->r_msg = NULL; /* initialize expunge ordering */
-               wake_up_process(msr->r_tsk);
-               /*
-                * Ensure that the wakeup is visible before setting r_msg as
-                * the receiving end depends on it: either spinning on a nil,
-                * or dealing with -EAGAIN cases. See lockless receive part 1
-                * and 2 in do_msgrcv().
-                */
-               smp_wmb(); /* barrier (B) */
+
+               wake_q_add(wake_q, msr->r_tsk);
                msr->r_msg = ERR_PTR(res);
        }
 }
@@ -213,11 +207,13 @@ static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
 {
        struct msg_msg *msg, *t;
        struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
+       WAKE_Q(wake_q);
 
-       expunge_all(msq, -EIDRM);
+       expunge_all(msq, -EIDRM, &wake_q);
        ss_wakeup(&msq->q_senders, 1);
        msg_rmid(ns, msq);
        ipc_unlock_object(&msq->q_perm);
+       wake_up_q(&wake_q);
        rcu_read_unlock();
 
        list_for_each_entry_safe(msg, t, &msq->q_messages, m_list) {
@@ -342,6 +338,7 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
        struct kern_ipc_perm *ipcp;
        struct msqid64_ds uninitialized_var(msqid64);
        struct msg_queue *msq;
+       WAKE_Q(wake_q);
        int err;
 
        if (cmd == IPC_SET) {
@@ -389,7 +386,7 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
                /* sleeping receivers might be excluded by
                 * stricter permissions.
                 */
-               expunge_all(msq, -EAGAIN);
+               expunge_all(msq, -EAGAIN, &wake_q);
                /* sleeping senders might be able to send
                 * due to a larger queue size.
                 */
@@ -402,6 +399,7 @@ static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,
 
 out_unlock0:
        ipc_unlock_object(&msq->q_perm);
+       wake_up_q(&wake_q);
 out_unlock1:
        rcu_read_unlock();
 out_up:
@@ -566,7 +564,8 @@ static int testmsg(struct msg_msg *msg, long type, int mode)
        return 0;
 }
 
-static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg)
+static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg,
+                                struct wake_q_head *wake_q)
 {
        struct msg_receiver *msr, *t;
 
@@ -577,27 +576,13 @@ static inline int pipelined_send(struct msg_queue *msq, struct msg_msg *msg)
 
                        list_del(&msr->r_list);
                        if (msr->r_maxsize < msg->m_ts) {
-                               /* initialize pipelined send ordering */
-                               msr->r_msg = NULL;
-                               wake_up_process(msr->r_tsk);
-                               /* barrier (B) see barrier comment below */
-                               smp_wmb();
+                               wake_q_add(wake_q, msr->r_tsk);
                                msr->r_msg = ERR_PTR(-E2BIG);
                        } else {
-                               msr->r_msg = NULL;
                                msq->q_lrpid = task_pid_vnr(msr->r_tsk);
                                msq->q_rtime = get_seconds();
-                               wake_up_process(msr->r_tsk);
-                               /*
-                                * Ensure that the wakeup is visible before
-                                * setting r_msg, as the receiving can otherwise
-                                * exit - once r_msg is set, the receiver can
-                                * continue. See lockless receive part 1 and 2
-                                * in do_msgrcv(). Barrier (B).
-                                */
-                               smp_wmb();
+                               wake_q_add(wake_q, msr->r_tsk);
                                msr->r_msg = msg;
-
                                return 1;
                        }
                }
@@ -613,6 +598,7 @@ long do_msgsnd(int msqid, long mtype, void __user *mtext,
        struct msg_msg *msg;
        int err;
        struct ipc_namespace *ns;
+       WAKE_Q(wake_q);
 
        ns = current->nsproxy->ipc_ns;
 
@@ -698,7 +684,7 @@ long do_msgsnd(int msqid, long mtype, void __user *mtext,
        msq->q_lspid = task_tgid_vnr(current);
        msq->q_stime = get_seconds();
 
-       if (!pipelined_send(msq, msg)) {
+       if (!pipelined_send(msq, msg, &wake_q)) {
                /* no one is waiting for this message, enqueue it */
                list_add_tail(&msg->m_list, &msq->q_messages);
                msq->q_cbytes += msgsz;
@@ -712,6 +698,7 @@ long do_msgsnd(int msqid, long mtype, void __user *mtext,
 
 out_unlock0:
        ipc_unlock_object(&msq->q_perm);
+       wake_up_q(&wake_q);
 out_unlock1:
        rcu_read_unlock();
        if (msg != NULL)
@@ -932,57 +919,25 @@ long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgfl
                rcu_read_lock();
 
                /* Lockless receive, part 2:
-                * Wait until pipelined_send or expunge_all are outside of
-                * wake_up_process(). There is a race with exit(), see
-                * ipc/mqueue.c for the details. The correct serialization
-                * ensures that a receiver cannot continue without the wakeup
-                * being visibible _before_ setting r_msg:
+                * The work in pipelined_send() and expunge_all():
+                * - Set pointer to message
+                * - Queue the receiver task for later wakeup
+                * - Wake up the process after the lock is dropped.
                 *
-                * CPU 0                             CPU 1
-                * <loop receiver>
-                *   smp_rmb(); (A) <-- pair -.      <waker thread>
-                *   <load ->r_msg>           |        msr->r_msg = NULL;
-                *                            |        wake_up_process();
-                * <continue>                 `------> smp_wmb(); (B)
-                *                                     msr->r_msg = msg;
-                *
-                * Where (A) orders the message value read and where (B) orders
-                * the write to the r_msg -- done in both pipelined_send and
-                * expunge_all.
+                * Should the process wake up before this wakeup (due to a
+                * signal) it will either see the message and continue …
                 */
-               for (;;) {
-                       /*
-                        * Pairs with writer barrier in pipelined_send
-                        * or expunge_all.
-                        */
-                       smp_rmb(); /* barrier (A) */
-                       msg = (struct msg_msg *)msr_d.r_msg;
-                       if (msg)
-                               break;
 
-                       /*
-                        * The cpu_relax() call is a compiler barrier
-                        * which forces everything in this loop to be
-                        * re-loaded.
-                        */
-                       cpu_relax();
-               }
-
-               /* Lockless receive, part 3:
-                * If there is a message or an error then accept it without
-                * locking.
-                */
+               msg = (struct msg_msg *)msr_d.r_msg;
                if (msg != ERR_PTR(-EAGAIN))
                        goto out_unlock1;
 
-               /* Lockless receive, part 3:
-                * Acquire the queue spinlock.
-                */
+                /*
+                 * … or see -EAGAIN, acquire the lock to check the message
+                 * again.
+                 */
                ipc_lock_object(&msq->q_perm);
 
-               /* Lockless receive, part 4:
-                * Repeat test after acquiring the spinlock.
-                */
                msg = (struct msg_msg *)msr_d.r_msg;
                if (msg != ERR_PTR(-EAGAIN))
                        goto out_unlock0;
diff --git a/ipc/sem.c b/ipc/sem.c
index 9862c3d1c26d..ef34d7376697 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -708,6 +708,13 @@ static int perform_atomic_semop(struct sem_array *sma, struct sem_queue *q)
 static void wake_up_sem_queue_prepare(struct list_head *pt,
                                struct sem_queue *q, int error)
 {
+#ifdef CONFIG_PREEMPT_RT_BASE
+       struct task_struct *p = q->sleeper;
+       get_task_struct(p);
+       q->status = error;
+       wake_up_process(p);
+       put_task_struct(p);
+#else
        if (list_empty(pt)) {
                /*
                 * Hold preempt off so that we don't get preempted and have the
@@ -719,6 +726,7 @@ static void wake_up_sem_queue_prepare(struct list_head *pt,
        q->pid = error;
 
        list_add_tail(&q->list, pt);
+#endif
 }
 
 /**
@@ -732,6 +740,7 @@ static void wake_up_sem_queue_prepare(struct list_head *pt,
  */
 static void wake_up_sem_queue_do(struct list_head *pt)
 {
+#ifndef CONFIG_PREEMPT_RT_BASE
        struct sem_queue *q, *t;
        int did_something;
 
@@ -744,6 +753,7 @@ static void wake_up_sem_queue_do(struct list_head *pt)
        }
        if (did_something)
                preempt_enable();
+#endif
 }
 
 static void unlink_queue(struct sem_array *sma, struct sem_queue *q)
diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks
index ebdb0043203a..b9e6aa7e5aa6 100644
--- a/kernel/Kconfig.locks
+++ b/kernel/Kconfig.locks
@@ -225,11 +225,11 @@ config ARCH_SUPPORTS_ATOMIC_RMW
 
 config MUTEX_SPIN_ON_OWNER
        def_bool y
-       depends on SMP && !DEBUG_MUTEXES && ARCH_SUPPORTS_ATOMIC_RMW
+       depends on SMP && !DEBUG_MUTEXES && ARCH_SUPPORTS_ATOMIC_RMW && !PREEMPT_RT_FULL
 
 config RWSEM_SPIN_ON_OWNER
        def_bool y
-       depends on SMP && RWSEM_XCHGADD_ALGORITHM && ARCH_SUPPORTS_ATOMIC_RMW
+       depends on SMP && RWSEM_XCHGADD_ALGORITHM && ARCH_SUPPORTS_ATOMIC_RMW && !PREEMPT_RT_FULL
 
 config LOCK_SPIN_ON_OWNER
        def_bool y
diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index 3f9c97419f02..11dbe26a8279 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -1,3 +1,16 @@
+config PREEMPT
+       bool
+       select PREEMPT_COUNT
+
+config PREEMPT_RT_BASE
+       bool
+       select PREEMPT
+
+config HAVE_PREEMPT_LAZY
+       bool
+
+config PREEMPT_LAZY
+       def_bool y if HAVE_PREEMPT_LAZY && PREEMPT_RT_FULL
 
 choice
        prompt "Preemption Model"
@@ -33,9 +46,9 @@ config PREEMPT_VOLUNTARY
 
          Select this if you are building a kernel for a desktop system.
 
-config PREEMPT
+config PREEMPT__LL
        bool "Preemptible Kernel (Low-Latency Desktop)"
-       select PREEMPT_COUNT
+       select PREEMPT
        select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK
        help
          This option reduces the latency of the kernel by making
@@ -52,6 +65,22 @@ config PREEMPT
          embedded system with latency requirements in the milliseconds
          range.
 
+config PREEMPT_RTB
+       bool "Preemptible Kernel (Basic RT)"
+       select PREEMPT_RT_BASE
+       help
+         This option is basically the same as (Low-Latency Desktop) but
+         enables changes which are preliminary for the full preemptible
+         RT kernel.
+
+config PREEMPT_RT_FULL
+       bool "Fully Preemptible Kernel (RT)"
+       depends on IRQ_FORCED_THREADING
+       select PREEMPT_RT_BASE
+       select PREEMPT_RCU
+       help
+         All and everything
+
 endchoice
 
 config PREEMPT_COUNT
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 4cb94b678e9f..8c41ee8a6fee 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -4741,10 +4741,10 @@ static void css_free_rcu_fn(struct rcu_head *rcu_head)
        queue_work(cgroup_destroy_wq, &css->destroy_work);
 }
 
-static void css_release_work_fn(struct work_struct *work)
+static void css_release_work_fn(struct swork_event *sev)
 {
        struct cgroup_subsys_state *css =
-               container_of(work, struct cgroup_subsys_state, destroy_work);
+               container_of(sev, struct cgroup_subsys_state, destroy_swork);
        struct cgroup_subsys *ss = css->ss;
        struct cgroup *cgrp = css->cgroup;
 
@@ -4783,8 +4783,8 @@ static void css_release(struct percpu_ref *ref)
        struct cgroup_subsys_state *css =
                container_of(ref, struct cgroup_subsys_state, refcnt);
 
-       INIT_WORK(&css->destroy_work, css_release_work_fn);
-       queue_work(cgroup_destroy_wq, &css->destroy_work);
+       INIT_SWORK(&css->destroy_swork, css_release_work_fn);
+       swork_queue(&css->destroy_swork);
 }
 
 static void init_and_link_css(struct cgroup_subsys_state *css,
@@ -5401,6 +5401,7 @@ static int __init cgroup_wq_init(void)
         */
        cgroup_destroy_wq = alloc_workqueue("cgroup_destroy", 0, 1);
        BUG_ON(!cgroup_destroy_wq);
+       BUG_ON(swork_get());
 
        /*
         * Used to destroy pidlists and separate to serve as flush domain.
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 40d20bf5de28..0be18c1684d8 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -75,8 +75,8 @@ static struct {
 #endif
 } cpu_hotplug = {
        .active_writer = NULL,
-       .wq = __WAIT_QUEUE_HEAD_INITIALIZER(cpu_hotplug.wq),
        .lock = __MUTEX_INITIALIZER(cpu_hotplug.lock),
+       .wq = __WAIT_QUEUE_HEAD_INITIALIZER(cpu_hotplug.wq),
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
        .dep_map = {.name = "cpu_hotplug.lock" },
 #endif
@@ -89,6 +89,289 @@ static struct {
 #define cpuhp_lock_acquire()      lock_map_acquire(&cpu_hotplug.dep_map)
 #define cpuhp_lock_release()      lock_map_release(&cpu_hotplug.dep_map)
 
+/**
+ * hotplug_pcp - per cpu hotplug descriptor
+ * @unplug:    set when pin_current_cpu() needs to sync tasks
+ * @sync_tsk:  the task that waits for tasks to finish pinned sections
+ * @refcount:  counter of tasks in pinned sections
+ * @grab_lock: set when the tasks entering pinned sections should wait
+ * @synced:    notifier for @sync_tsk to tell cpu_down it's finished
+ * @mutex:     the mutex to make tasks wait (used when @grab_lock is true)
+ * @mutex_init:        zero if the mutex hasn't been initialized yet.
+ *
+ * Although @unplug and @sync_tsk may point to the same task, the @unplug
+ * is used as a flag and still exists after @sync_tsk has exited and
+ * @sync_tsk set to NULL.
+ */
+struct hotplug_pcp {
+       struct task_struct *unplug;
+       struct task_struct *sync_tsk;
+       int refcount;
+       int grab_lock;
+       struct completion synced;
+       struct completion unplug_wait;
+#ifdef CONFIG_PREEMPT_RT_FULL
+       /*
+        * Note, on PREEMPT_RT, the hotplug lock must save the state of
+        * the task, otherwise the mutex will cause the task to fail
+        * to sleep when required. (Because it's called from migrate_disable())
+        *
+        * The spinlock_t on PREEMPT_RT is a mutex that saves the task's
+        * state.
+        */
+       spinlock_t lock;
+#else
+       struct mutex mutex;
+#endif
+       int mutex_init;
+};
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+# define hotplug_lock(hp) rt_spin_lock__no_mg(&(hp)->lock)
+# define hotplug_unlock(hp) rt_spin_unlock__no_mg(&(hp)->lock)
+#else
+# define hotplug_lock(hp) mutex_lock(&(hp)->mutex)
+# define hotplug_unlock(hp) mutex_unlock(&(hp)->mutex)
+#endif
+
+static DEFINE_PER_CPU(struct hotplug_pcp, hotplug_pcp);
+
+/**
+ * pin_current_cpu - Prevent the current cpu from being unplugged
+ *
+ * Lightweight version of get_online_cpus() to prevent cpu from being
+ * unplugged when code runs in a migration disabled region.
+ *
+ * Must be called with preemption disabled (preempt_count = 1)!
+ */
+void pin_current_cpu(void)
+{
+       struct hotplug_pcp *hp;
+       int force = 0;
+
+retry:
+       hp = this_cpu_ptr(&hotplug_pcp);
+
+       if (!hp->unplug || hp->refcount || force || preempt_count() > 1 ||
+           hp->unplug == current) {
+               hp->refcount++;
+               return;
+       }
+       if (hp->grab_lock) {
+               preempt_enable();
+               hotplug_lock(hp);
+               hotplug_unlock(hp);
+       } else {
+               preempt_enable();
+               /*
+                * Try to push this task off of this CPU.
+                */
+               if (!migrate_me()) {
+                       preempt_disable();
+                       hp = this_cpu_ptr(&hotplug_pcp);
+                       if (!hp->grab_lock) {
+                               /*
+                                * Just let it continue it's already pinned
+                                * or about to sleep.
+                                */
+                               force = 1;
+                               goto retry;
+                       }
+                       preempt_enable();
+               }
+       }
+       preempt_disable();
+       goto retry;
+}
+
+/**
+ * unpin_current_cpu - Allow unplug of current cpu
+ *
+ * Must be called with preemption or interrupts disabled!
+ */
+void unpin_current_cpu(void)
+{
+       struct hotplug_pcp *hp = this_cpu_ptr(&hotplug_pcp);
+
+       WARN_ON(hp->refcount <= 0);
+
+       /* This is safe. sync_unplug_thread is pinned to this cpu */
+       if (!--hp->refcount && hp->unplug && hp->unplug != current)
+               wake_up_process(hp->unplug);
+}
+
+static void wait_for_pinned_cpus(struct hotplug_pcp *hp)
+{
+       set_current_state(TASK_UNINTERRUPTIBLE);
+       while (hp->refcount) {
+               schedule_preempt_disabled();
+               set_current_state(TASK_UNINTERRUPTIBLE);
+       }
+}
+
+static int sync_unplug_thread(void *data)
+{
+       struct hotplug_pcp *hp = data;
+
+       wait_for_completion(&hp->unplug_wait);
+       preempt_disable();
+       hp->unplug = current;
+       wait_for_pinned_cpus(hp);
+
+       /*
+        * This thread will synchronize the cpu_down() with threads
+        * that have pinned the CPU. When the pinned CPU count reaches
+        * zero, we inform the cpu_down code to continue to the next step.
+        */
+       set_current_state(TASK_UNINTERRUPTIBLE);
+       preempt_enable();
+       complete(&hp->synced);
+
+       /*
+        * If all succeeds, the next step will need tasks to wait till
+        * the CPU is offline before continuing. To do this, the grab_lock
+        * is set and tasks going into pin_current_cpu() will block on the
+        * mutex. But we still need to wait for those that are already in
+        * pinned CPU sections. If the cpu_down() failed, the kthread_should_stop()
+        * will kick this thread out.
+        */
+       while (!hp->grab_lock && !kthread_should_stop()) {
+               schedule();
+               set_current_state(TASK_UNINTERRUPTIBLE);
+       }
+
+       /* Make sure grab_lock is seen before we see a stale completion */
+       smp_mb();
+
+       /*
+        * Now just before cpu_down() enters stop machine, we need to make
+        * sure all tasks that are in pinned CPU sections are out, and new
+        * tasks will now grab the lock, keeping them from entering pinned
+        * CPU sections.
+        */
+       if (!kthread_should_stop()) {
+               preempt_disable();
+               wait_for_pinned_cpus(hp);
+               preempt_enable();
+               complete(&hp->synced);
+       }
+
+       set_current_state(TASK_UNINTERRUPTIBLE);
+       while (!kthread_should_stop()) {
+               schedule();
+               set_current_state(TASK_UNINTERRUPTIBLE);
+       }
+       set_current_state(TASK_RUNNING);
+
+       /*
+        * Force this thread off this CPU as it's going down and
+        * we don't want any more work on this CPU.
+        */
+       current->flags &= ~PF_NO_SETAFFINITY;
+       set_cpus_allowed_ptr(current, cpu_present_mask);
+       migrate_me();
+       return 0;
+}
+
+static void __cpu_unplug_sync(struct hotplug_pcp *hp)
+{
+       wake_up_process(hp->sync_tsk);
+       wait_for_completion(&hp->synced);
+}
+
+static void __cpu_unplug_wait(unsigned int cpu)
+{
+       struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu);
+
+       complete(&hp->unplug_wait);
+       wait_for_completion(&hp->synced);
+}
+
+/*
+ * Start the sync_unplug_thread on the target cpu and wait for it to
+ * complete.
+ */
+static int cpu_unplug_begin(unsigned int cpu)
+{
+       struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu);
+       int err;
+
+       /* Protected by cpu_hotplug.lock */
+       if (!hp->mutex_init) {
+#ifdef CONFIG_PREEMPT_RT_FULL
+               spin_lock_init(&hp->lock);
+#else
+               mutex_init(&hp->mutex);
+#endif
+               hp->mutex_init = 1;
+       }
+
+       /* Inform the scheduler to migrate tasks off this CPU */
+       tell_sched_cpu_down_begin(cpu);
+
+       init_completion(&hp->synced);
+       init_completion(&hp->unplug_wait);
+
+       hp->sync_tsk = kthread_create(sync_unplug_thread, hp, "sync_unplug/%d", cpu);
+       if (IS_ERR(hp->sync_tsk)) {
+               err = PTR_ERR(hp->sync_tsk);
+               hp->sync_tsk = NULL;
+               return err;
+       }
+       kthread_bind(hp->sync_tsk, cpu);
+
+       /*
+        * Wait for tasks to get out of the pinned sections,
+        * it's still OK if new tasks enter. Some CPU notifiers will
+        * wait for tasks that are going to enter these sections and
+        * we must not have them block.
+        */
+       wake_up_process(hp->sync_tsk);
+       return 0;
+}
+
+static void cpu_unplug_sync(unsigned int cpu)
+{
+       struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu);
+
+       init_completion(&hp->synced);
+       /* The completion needs to be initialzied before setting grab_lock */
+       smp_wmb();
+
+       /* Grab the mutex before setting grab_lock */
+       hotplug_lock(hp);
+       hp->grab_lock = 1;
+
+       /*
+        * The CPU notifiers have been completed.
+        * Wait for tasks to get out of pinned CPU sections and have new
+        * tasks block until the CPU is completely down.
+        */
+       __cpu_unplug_sync(hp);
+
+       /* All done with the sync thread */
+       kthread_stop(hp->sync_tsk);
+       hp->sync_tsk = NULL;
+}
+
+static void cpu_unplug_done(unsigned int cpu)
+{
+       struct hotplug_pcp *hp = &per_cpu(hotplug_pcp, cpu);
+
+       hp->unplug = NULL;
+       /* Let all tasks know cpu unplug is finished before cleaning up */
+       smp_wmb();
+
+       if (hp->sync_tsk)
+               kthread_stop(hp->sync_tsk);
+
+       if (hp->grab_lock) {
+               hotplug_unlock(hp);
+               /* protected by cpu_hotplug.lock */
+               hp->grab_lock = 0;
+       }
+       tell_sched_cpu_down_done(cpu);
+}
 
 void get_online_cpus(void)
 {
@@ -338,13 +621,15 @@ static int take_cpu_down(void *_param)
 /* Requires cpu_add_remove_lock to be held */
 static int _cpu_down(unsigned int cpu, int tasks_frozen)
 {
-       int err, nr_calls = 0;
+       int mycpu, err, nr_calls = 0;
        void *hcpu = (void *)(long)cpu;
        unsigned long mod = tasks_frozen ? CPU_TASKS_FROZEN : 0;
        struct take_cpu_down_param tcd_param = {
                .mod = mod,
                .hcpu = hcpu,
        };
+       cpumask_var_t cpumask;
+       cpumask_var_t cpumask_org;
 
        if (num_online_cpus() == 1)
                return -EBUSY;
@@ -352,7 +637,34 @@ static int _cpu_down(unsigned int cpu, int tasks_frozen)
        if (!cpu_online(cpu))
                return -EINVAL;
 
+       /* Move the downtaker off the unplug cpu */
+       if (!alloc_cpumask_var(&cpumask, GFP_KERNEL))
+               return -ENOMEM;
+       if (!alloc_cpumask_var(&cpumask_org, GFP_KERNEL))  {
+               free_cpumask_var(cpumask);
+               return -ENOMEM;
+       }
+
+       cpumask_copy(cpumask_org, tsk_cpus_allowed(current));
+       cpumask_andnot(cpumask, cpu_online_mask, cpumask_of(cpu));
+       set_cpus_allowed_ptr(current, cpumask);
+       free_cpumask_var(cpumask);
+       migrate_disable();
+       mycpu = smp_processor_id();
+       if (mycpu == cpu) {
+               printk(KERN_ERR "Yuck! Still on unplug CPU\n!");
+               migrate_enable();
+               err = -EBUSY;
+               goto restore_cpus;
+       }
+       migrate_enable();
+
        cpu_hotplug_begin();
+       err = cpu_unplug_begin(cpu);
+       if (err) {
+               printk("cpu_unplug_begin(%d) failed\n", cpu);
+               goto out_cancel;
+       }
 
        err = __cpu_notify(CPU_DOWN_PREPARE | mod, hcpu, -1, &nr_calls);
        if (err) {
@@ -378,8 +690,12 @@ static int _cpu_down(unsigned int cpu, int tasks_frozen)
        else
                synchronize_rcu();
 
+       __cpu_unplug_wait(cpu);
        smpboot_park_threads(cpu);
 
+       /* Notifiers are done. Don't let any more tasks pin this CPU. */
+       cpu_unplug_sync(cpu);
+
        /*
         * Prevent irq alloc/free while the dying cpu reorganizes the
         * interrupt affinities.
@@ -424,9 +740,14 @@ static int _cpu_down(unsigned int cpu, int tasks_frozen)
        check_for_tasks(cpu);
 
 out_release:
+       cpu_unplug_done(cpu);
+out_cancel:
        cpu_hotplug_done();
        if (!err)
                cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu);
+restore_cpus:
+       set_cpus_allowed_ptr(current, cpumask_org);
+       free_cpumask_var(cpumask_org);
        return err;
 }
 
diff --git a/kernel/cpu_pm.c b/kernel/cpu_pm.c
index 009cc9a17d95..10f4640f991e 100644
--- a/kernel/cpu_pm.c
+++ b/kernel/cpu_pm.c
@@ -22,14 +22,13 @@
 #include <linux/spinlock.h>
 #include <linux/syscore_ops.h>
 
-static DEFINE_RWLOCK(cpu_pm_notifier_lock);
-static RAW_NOTIFIER_HEAD(cpu_pm_notifier_chain);
+static ATOMIC_NOTIFIER_HEAD(cpu_pm_notifier_chain);
 
 static int cpu_pm_notify(enum cpu_pm_event event, int nr_to_call, int *nr_calls)
 {
        int ret;
 
-       ret = __raw_notifier_call_chain(&cpu_pm_notifier_chain, event, NULL,
+       ret = __atomic_notifier_call_chain(&cpu_pm_notifier_chain, event, NULL,
                nr_to_call, nr_calls);
 
        return notifier_to_errno(ret);
@@ -47,14 +46,7 @@ static int cpu_pm_notify(enum cpu_pm_event event, int nr_to_call, int *nr_calls)
  */
 int cpu_pm_register_notifier(struct notifier_block *nb)
 {
-       unsigned long flags;
-       int ret;
-
-       write_lock_irqsave(&cpu_pm_notifier_lock, flags);
-       ret = raw_notifier_chain_register(&cpu_pm_notifier_chain, nb);
-       write_unlock_irqrestore(&cpu_pm_notifier_lock, flags);
-
-       return ret;
+       return atomic_notifier_chain_register(&cpu_pm_notifier_chain, nb);
 }
 EXPORT_SYMBOL_GPL(cpu_pm_register_notifier);
 
@@ -69,14 +61,7 @@ EXPORT_SYMBOL_GPL(cpu_pm_register_notifier);
  */
 int cpu_pm_unregister_notifier(struct notifier_block *nb)
 {
-       unsigned long flags;
-       int ret;
-
-       write_lock_irqsave(&cpu_pm_notifier_lock, flags);
-       ret = raw_notifier_chain_unregister(&cpu_pm_notifier_chain, nb);
-       write_unlock_irqrestore(&cpu_pm_notifier_lock, flags);
-
-       return ret;
+       return atomic_notifier_chain_unregister(&cpu_pm_notifier_chain, nb);
 }
 EXPORT_SYMBOL_GPL(cpu_pm_unregister_notifier);
 
@@ -100,7 +85,6 @@ int cpu_pm_enter(void)
        int nr_calls;
        int ret = 0;
 
-       read_lock(&cpu_pm_notifier_lock);
        ret = cpu_pm_notify(CPU_PM_ENTER, -1, &nr_calls);
        if (ret)
                /*
@@ -108,7 +92,6 @@ int cpu_pm_enter(void)
                 * PM entry who are notified earlier to prepare for it.
                 */
                cpu_pm_notify(CPU_PM_ENTER_FAILED, nr_calls - 1, NULL);
-       read_unlock(&cpu_pm_notifier_lock);
 
        return ret;
 }
@@ -128,13 +111,7 @@ EXPORT_SYMBOL_GPL(cpu_pm_enter);
  */
 int cpu_pm_exit(void)
 {
-       int ret;
-
-       read_lock(&cpu_pm_notifier_lock);
-       ret = cpu_pm_notify(CPU_PM_EXIT, -1, NULL);
-       read_unlock(&cpu_pm_notifier_lock);
-
-       return ret;
+       return cpu_pm_notify(CPU_PM_EXIT, -1, NULL);
 }
 EXPORT_SYMBOL_GPL(cpu_pm_exit);
 
@@ -159,7 +136,6 @@ int cpu_cluster_pm_enter(void)
        int nr_calls;
        int ret = 0;
 
-       read_lock(&cpu_pm_notifier_lock);
        ret = cpu_pm_notify(CPU_CLUSTER_PM_ENTER, -1, &nr_calls);
        if (ret)
                /*
@@ -167,7 +143,6 @@ int cpu_cluster_pm_enter(void)
                 * PM entry who are notified earlier to prepare for it.
                 */
                cpu_pm_notify(CPU_CLUSTER_PM_ENTER_FAILED, nr_calls - 1, NULL);
-       read_unlock(&cpu_pm_notifier_lock);
 
        return ret;
 }
@@ -190,13 +165,7 @@ EXPORT_SYMBOL_GPL(cpu_cluster_pm_enter);
  */
 int cpu_cluster_pm_exit(void)
 {
-       int ret;
-
-       read_lock(&cpu_pm_notifier_lock);
-       ret = cpu_pm_notify(CPU_CLUSTER_PM_EXIT, -1, NULL);
-       read_unlock(&cpu_pm_notifier_lock);
-
-       return ret;
+       return cpu_pm_notify(CPU_CLUSTER_PM_EXIT, -1, NULL);
 }
 EXPORT_SYMBOL_GPL(cpu_cluster_pm_exit);
 
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index dd3ae6ee064d..8dc21a9ac292 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -284,7 +284,7 @@ static struct cpuset top_cpuset = {
  */
 
 static DEFINE_MUTEX(cpuset_mutex);
-static DEFINE_SPINLOCK(callback_lock);
+static DEFINE_RAW_SPINLOCK(callback_lock);
 
 static struct workqueue_struct *cpuset_migrate_mm_wq;
 
@@ -907,9 +907,9 @@ static void update_cpumasks_hier(struct cpuset *cs, struct cpumask *new_cpus)
                        continue;
                rcu_read_unlock();
 
-               spin_lock_irq(&callback_lock);
+               raw_spin_lock_irq(&callback_lock);
                cpumask_copy(cp->effective_cpus, new_cpus);
-               spin_unlock_irq(&callback_lock);
+               raw_spin_unlock_irq(&callback_lock);
 
                WARN_ON(!cgroup_subsys_on_dfl(cpuset_cgrp_subsys) &&
                        !cpumask_equal(cp->cpus_allowed, cp->effective_cpus));
@@ -974,9 +974,9 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
        if (retval < 0)
                return retval;
 
-       spin_lock_irq(&callback_lock);
+       raw_spin_lock_irq(&callback_lock);
        cpumask_copy(cs->cpus_allowed, trialcs->cpus_allowed);
-       spin_unlock_irq(&callback_lock);
+       raw_spin_unlock_irq(&callback_lock);
 
        /* use trialcs->cpus_allowed as a temp variable */
        update_cpumasks_hier(cs, trialcs->cpus_allowed);
@@ -1185,9 +1185,9 @@ static void update_nodemasks_hier(struct cpuset *cs, nodemask_t *new_mems)
                        continue;
                rcu_read_unlock();
 
-               spin_lock_irq(&callback_lock);
+               raw_spin_lock_irq(&callback_lock);
                cp->effective_mems = *new_mems;
-               spin_unlock_irq(&callback_lock);
+               raw_spin_unlock_irq(&callback_lock);
 
                WARN_ON(!cgroup_subsys_on_dfl(cpuset_cgrp_subsys) &&
                        !nodes_equal(cp->mems_allowed, cp->effective_mems));
@@ -1255,9 +1255,9 @@ static int update_nodemask(struct cpuset *cs, struct cpuset *trialcs,
        if (retval < 0)
                goto done;
 
-       spin_lock_irq(&callback_lock);
+       raw_spin_lock_irq(&callback_lock);
        cs->mems_allowed = trialcs->mems_allowed;
-       spin_unlock_irq(&callback_lock);
+       raw_spin_unlock_irq(&callback_lock);
 
        /* use trialcs->mems_allowed as a temp variable */
        update_nodemasks_hier(cs, &trialcs->mems_allowed);
@@ -1348,9 +1348,9 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
        spread_flag_changed = ((is_spread_slab(cs) != is_spread_slab(trialcs))
                        || (is_spread_page(cs) != is_spread_page(trialcs)));
 
-       spin_lock_irq(&callback_lock);
+       raw_spin_lock_irq(&callback_lock);
        cs->flags = trialcs->flags;
-       spin_unlock_irq(&callback_lock);
+       raw_spin_unlock_irq(&callback_lock);
 
        if (!cpumask_empty(trialcs->cpus_allowed) && balance_flag_changed)
                rebuild_sched_domains_locked();
@@ -1762,7 +1762,7 @@ static int cpuset_common_seq_show(struct seq_file *sf, void *v)
        cpuset_filetype_t type = seq_cft(sf)->private;
        int ret = 0;
 
-       spin_lock_irq(&callback_lock);
+       raw_spin_lock_irq(&callback_lock);
 
        switch (type) {
        case FILE_CPULIST:
@@ -1781,7 +1781,7 @@ static int cpuset_common_seq_show(struct seq_file *sf, void *v)
                ret = -EINVAL;
        }
 
-       spin_unlock_irq(&callback_lock);
+       raw_spin_unlock_irq(&callback_lock);
        return ret;
 }
 
@@ -1996,12 +1996,12 @@ static int cpuset_css_online(struct cgroup_subsys_state *css)
 
        cpuset_inc();
 
-       spin_lock_irq(&callback_lock);
+       raw_spin_lock_irq(&callback_lock);
        if (cgroup_subsys_on_dfl(cpuset_cgrp_subsys)) {
                cpumask_copy(cs->effective_cpus, parent->effective_cpus);
                cs->effective_mems = parent->effective_mems;
        }
-       spin_unlock_irq(&callback_lock);
+       raw_spin_unlock_irq(&callback_lock);
 
        if (!test_bit(CGRP_CPUSET_CLONE_CHILDREN, &css->cgroup->flags))
                goto out_unlock;
@@ -2028,12 +2028,12 @@ static int cpuset_css_online(struct cgroup_subsys_state *css)
        }
        rcu_read_unlock();
 
-       spin_lock_irq(&callback_lock);
+       raw_spin_lock_irq(&callback_lock);
        cs->mems_allowed = parent->mems_allowed;
        cs->effective_mems = parent->mems_allowed;
        cpumask_copy(cs->cpus_allowed, parent->cpus_allowed);
        cpumask_copy(cs->effective_cpus, parent->cpus_allowed);
-       spin_unlock_irq(&callback_lock);
+       raw_spin_unlock_irq(&callback_lock);
 out_unlock:
        mutex_unlock(&cpuset_mutex);
        return 0;
@@ -2072,7 +2072,7 @@ static void cpuset_css_free(struct cgroup_subsys_state *css)
 static void cpuset_bind(struct cgroup_subsys_state *root_css)
 {
        mutex_lock(&cpuset_mutex);
-       spin_lock_irq(&callback_lock);
+       raw_spin_lock_irq(&callback_lock);
 
        if (cgroup_subsys_on_dfl(cpuset_cgrp_subsys)) {
                cpumask_copy(top_cpuset.cpus_allowed, cpu_possible_mask);
@@ -2083,7 +2083,7 @@ static void cpuset_bind(struct cgroup_subsys_state *root_css)
                top_cpuset.mems_allowed = top_cpuset.effective_mems;
        }
 
-       spin_unlock_irq(&callback_lock);
+       raw_spin_unlock_irq(&callback_lock);
        mutex_unlock(&cpuset_mutex);
 }
 
@@ -2184,12 +2184,12 @@ hotplug_update_tasks_legacy(struct cpuset *cs,
 {
        bool is_empty;
 
-       spin_lock_irq(&callback_lock);
+       raw_spin_lock_irq(&callback_lock);
        cpumask_copy(cs->cpus_allowed, new_cpus);
        cpumask_copy(cs->effective_cpus, new_cpus);
        cs->mems_allowed = *new_mems;
        cs->effective_mems = *new_mems;
-       spin_unlock_irq(&callback_lock);
+       raw_spin_unlock_irq(&callback_lock);
 
        /*
         * Don't call update_tasks_cpumask() if the cpuset becomes empty,
@@ -2226,10 +2226,10 @@ hotplug_update_tasks(struct cpuset *cs,
        if (nodes_empty(*new_mems))
                *new_mems = parent_cs(cs)->effective_mems;
 
-       spin_lock_irq(&callback_lock);
+       raw_spin_lock_irq(&callback_lock);
        cpumask_copy(cs->effective_cpus, new_cpus);
        cs->effective_mems = *new_mems;
-       spin_unlock_irq(&callback_lock);
+       raw_spin_unlock_irq(&callback_lock);
 
        if (cpus_updated)
                update_tasks_cpumask(cs);
@@ -2322,21 +2322,21 @@ static void cpuset_hotplug_workfn(struct work_struct *work)
 
        /* synchronize cpus_allowed to cpu_active_mask */
        if (cpus_updated) {
-               spin_lock_irq(&callback_lock);
+               raw_spin_lock_irq(&callback_lock);
                if (!on_dfl)
                        cpumask_copy(top_cpuset.cpus_allowed, &new_cpus);
                cpumask_copy(top_cpuset.effective_cpus, &new_cpus);
-               spin_unlock_irq(&callback_lock);
+               raw_spin_unlock_irq(&callback_lock);
                /* we don't mess with cpumasks of tasks in top_cpuset */
        }
 
        /* synchronize mems_allowed to N_MEMORY */
        if (mems_updated) {
-               spin_lock_irq(&callback_lock);
+               raw_spin_lock_irq(&callback_lock);
                if (!on_dfl)
                        top_cpuset.mems_allowed = new_mems;
                top_cpuset.effective_mems = new_mems;
-               spin_unlock_irq(&callback_lock);
+               raw_spin_unlock_irq(&callback_lock);
                update_tasks_nodemask(&top_cpuset);
        }
 
@@ -2441,11 +2441,11 @@ void cpuset_cpus_allowed(struct task_struct *tsk, struct cpumask *pmask)
 {
        unsigned long flags;
 
-       spin_lock_irqsave(&callback_lock, flags);
+       raw_spin_lock_irqsave(&callback_lock, flags);
        rcu_read_lock();
        guarantee_online_cpus(task_cs(tsk), pmask);
        rcu_read_unlock();
-       spin_unlock_irqrestore(&callback_lock, flags);
+       raw_spin_unlock_irqrestore(&callback_lock, flags);
 }
 
 void cpuset_cpus_allowed_fallback(struct task_struct *tsk)
@@ -2493,11 +2493,11 @@ nodemask_t cpuset_mems_allowed(struct task_struct *tsk)
        nodemask_t mask;
        unsigned long flags;
 
-       spin_lock_irqsave(&callback_lock, flags);
+       raw_spin_lock_irqsave(&callback_lock, flags);
        rcu_read_lock();
        guarantee_online_mems(task_cs(tsk), &mask);
        rcu_read_unlock();
-       spin_unlock_irqrestore(&callback_lock, flags);
+       raw_spin_unlock_irqrestore(&callback_lock, flags);
 
        return mask;
 }
@@ -2589,14 +2589,14 @@ int __cpuset_node_allowed(int node, gfp_t gfp_mask)
                return 1;
 
        /* Not hardwall and node outside mems_allowed: scan up cpusets */
-       spin_lock_irqsave(&callback_lock, flags);
+       raw_spin_lock_irqsave(&callback_lock, flags);
 
        rcu_read_lock();
        cs = nearest_hardwall_ancestor(task_cs(current));
        allowed = node_isset(node, cs->mems_allowed);
        rcu_read_unlock();
 
-       spin_unlock_irqrestore(&callback_lock, flags);
+       raw_spin_unlock_irqrestore(&callback_lock, flags);
        return allowed;
 }
 
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c
index 77777d918676..3203e9dee9f8 100644
--- a/kernel/debug/kdb/kdb_io.c
+++ b/kernel/debug/kdb/kdb_io.c
@@ -554,7 +554,6 @@ int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
        int linecount;
        int colcount;
        int logging, saved_loglevel = 0;
-       int saved_trap_printk;
        int got_printf_lock = 0;
        int retlen = 0;
        int fnd, len;
@@ -565,8 +564,6 @@ int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
        unsigned long uninitialized_var(flags);
 
        preempt_disable();
-       saved_trap_printk = kdb_trap_printk;
-       kdb_trap_printk = 0;
 
        /* Serialize kdb_printf if multiple cpus try to write at once.
         * But if any cpu goes recursive in kdb, just print the output,
@@ -855,7 +852,6 @@ int vkdb_printf(enum kdb_msgsrc src, const char *fmt, va_list ap)
        } else {
                __release(kdb_printf_lock);
        }
-       kdb_trap_printk = saved_trap_printk;
        preempt_enable();
        return retlen;
 }
@@ -865,9 +861,11 @@ int kdb_printf(const char *fmt, ...)
        va_list ap;
        int r;
 
+       kdb_trap_printk++;
        va_start(ap, fmt);
        r = vkdb_printf(KDB_MSGSRC_INTERNAL, fmt, ap);
        va_end(ap);
+       kdb_trap_printk--;
 
        return r;
 }
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 8f75386e61a7..489cf0e1ac9c 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -802,6 +802,7 @@ static void __perf_mux_hrtimer_init(struct perf_cpu_context *cpuctx, int cpu)
        raw_spin_lock_init(&cpuctx->hrtimer_lock);
        hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
        timer->function = perf_mux_hrtimer_handler;
+       timer->irqsafe = 1;
 }
 
 static int perf_mux_hrtimer_restart(struct perf_cpu_context *cpuctx)
@@ -7241,6 +7242,7 @@ static void perf_swevent_init_hrtimer(struct perf_event *event)
 
        hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
        hwc->hrtimer.function = perf_swevent_hrtimer;
+       hwc->hrtimer.irqsafe = 1;
 
        /*
         * Since hrtimers have a fixed rate, we can do a static freq->period
diff --git a/kernel/exit.c b/kernel/exit.c
index ffba5df4abd5..e199407f8831 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -144,7 +144,7 @@ static void __exit_signal(struct task_struct *tsk)
         * Do this under ->siglock, we can race with another thread
         * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals.
         */
-       flush_sigqueue(&tsk->pending);
+       flush_task_sigqueue(tsk);
        tsk->sighand = NULL;
        spin_unlock(&sighand->siglock);
 
diff --git a/kernel/fork.c b/kernel/fork.c
index ac00f14208b7..9859641947bd 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -109,7 +109,7 @@ int max_threads;            /* tunable limit on nr_threads */
 
 DEFINE_PER_CPU(unsigned long, process_counts) = 0;
 
-__cacheline_aligned DEFINE_RWLOCK(tasklist_lock);  /* outer */
+DEFINE_RWLOCK(tasklist_lock);  /* outer */
 
 #ifdef CONFIG_PROVE_RCU
 int lockdep_tasklist_lock_is_held(void)
@@ -246,7 +246,9 @@ static inline void put_signal_struct(struct signal_struct *sig)
        if (atomic_dec_and_test(&sig->sigcnt))
                free_signal_struct(sig);
 }
-
+#ifdef CONFIG_PREEMPT_RT_BASE
+static
+#endif
 void __put_task_struct(struct task_struct *tsk)
 {
        WARN_ON(!tsk->exit_state);
@@ -263,7 +265,18 @@ void __put_task_struct(struct task_struct *tsk)
        if (!profile_handoff_task(tsk))
                free_task(tsk);
 }
+#ifndef CONFIG_PREEMPT_RT_BASE
 EXPORT_SYMBOL_GPL(__put_task_struct);
+#else
+void __put_task_struct_cb(struct rcu_head *rhp)
+{
+       struct task_struct *tsk = container_of(rhp, struct task_struct, put_rcu);
+
+       __put_task_struct(tsk);
+
+}
+EXPORT_SYMBOL_GPL(__put_task_struct_cb);
+#endif
 
 void __init __weak arch_task_cache_init(void) { }
 
@@ -388,6 +401,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
        tsk->splice_pipe = NULL;
        tsk->task_frag.page = NULL;
        tsk->wake_q.next = NULL;
+       tsk->wake_q_sleeper.next = NULL;
 
        account_kernel_stack(ti, 1);
 
@@ -699,6 +713,19 @@ void __mmdrop(struct mm_struct *mm)
 }
 EXPORT_SYMBOL_GPL(__mmdrop);
 
+#ifdef CONFIG_PREEMPT_RT_BASE
+/*
+ * RCU callback for delayed mm drop. Not strictly rcu, but we don't
+ * want another facility to make this work.
+ */
+void __mmdrop_delayed(struct rcu_head *rhp)
+{
+       struct mm_struct *mm = container_of(rhp, struct mm_struct, delayed_drop);
+
+       __mmdrop(mm);
+}
+#endif
+
 /*
  * Decrement the use count and release all resources for an mm.
  */
@@ -1249,6 +1276,9 @@ static void rt_mutex_init_task(struct task_struct *p)
  */
 static void posix_cpu_timers_init(struct task_struct *tsk)
 {
+#ifdef CONFIG_PREEMPT_RT_BASE
+       tsk->posix_timer_list = NULL;
+#endif
        tsk->cputime_expires.prof_exp = 0;
        tsk->cputime_expires.virt_exp = 0;
        tsk->cputime_expires.sched_exp = 0;
@@ -1375,15 +1405,16 @@ static struct task_struct *copy_process(unsigned long clone_flags,
        spin_lock_init(&p->alloc_lock);
 
        init_sigpending(&p->pending);
+       p->sigqueue_cache = NULL;
 
        p->utime = p->stime = p->gtime = 0;
        p->utimescaled = p->stimescaled = 0;
        prev_cputime_init(&p->prev_cputime);
 
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
-       seqlock_init(&p->vtime_seqlock);
+       seqcount_init(&p->vtime_seqcount);
        p->vtime_snap = 0;
-       p->vtime_snap_whence = VTIME_SLEEPING;
+       p->vtime_snap_whence = VTIME_INACTIVE;
 #endif
 
 #if defined(SPLIT_RSS_COUNTING)
diff --git a/kernel/futex.c b/kernel/futex.c
index fc68462801de..b577ac5dc4a0 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -815,7 +815,9 @@ void exit_pi_state_list(struct task_struct *curr)
                 * task still owns the PI-state:
                 */
                if (head->next != next) {
+                       raw_spin_unlock_irq(&curr->pi_lock);
                        spin_unlock(&hb->lock);
+                       raw_spin_lock_irq(&curr->pi_lock);
                        continue;
                }
 
@@ -1210,6 +1212,7 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this,
        struct futex_pi_state *pi_state = this->pi_state;
        u32 uninitialized_var(curval), newval;
        WAKE_Q(wake_q);
+       WAKE_Q(wake_sleeper_q);
        bool deboost;
        int ret = 0;
 
@@ -1223,7 +1226,7 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this,
        if (pi_state->owner != current)
                return -EINVAL;
 
-       raw_spin_lock(&pi_state->pi_mutex.wait_lock);
+       raw_spin_lock_irq(&pi_state->pi_mutex.wait_lock);
        new_owner = rt_mutex_next_owner(&pi_state->pi_mutex);
 
        /*
@@ -1259,24 +1262,25 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this,
                        ret = -EINVAL;
        }
        if (ret) {
-               raw_spin_unlock(&pi_state->pi_mutex.wait_lock);
+               raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock);
                return ret;
        }
 
-       raw_spin_lock_irq(&pi_state->owner->pi_lock);
+       raw_spin_lock(&pi_state->owner->pi_lock);
        WARN_ON(list_empty(&pi_state->list));
        list_del_init(&pi_state->list);
-       raw_spin_unlock_irq(&pi_state->owner->pi_lock);
+       raw_spin_unlock(&pi_state->owner->pi_lock);
 
-       raw_spin_lock_irq(&new_owner->pi_lock);
+       raw_spin_lock(&new_owner->pi_lock);
        WARN_ON(!list_empty(&pi_state->list));
        list_add(&pi_state->list, &new_owner->pi_state_list);
        pi_state->owner = new_owner;
-       raw_spin_unlock_irq(&new_owner->pi_lock);
+       raw_spin_unlock(&new_owner->pi_lock);
 
-       raw_spin_unlock(&pi_state->pi_mutex.wait_lock);
+       raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock);
 
-       deboost = rt_mutex_futex_unlock(&pi_state->pi_mutex, &wake_q);
+       deboost = rt_mutex_futex_unlock(&pi_state->pi_mutex, &wake_q,
+                                       &wake_sleeper_q);
 
        /*
         * First unlock HB so the waiter does not spin on it once he got woken
@@ -1284,8 +1288,9 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this,
         * deboost first (and lose our higher priority), then the task might get
         * scheduled away before the wake up can take place.
         */
-       spin_unlock(&hb->lock);
+       deboost |= spin_unlock_no_deboost(&hb->lock);
        wake_up_q(&wake_q);
+       wake_up_q_sleeper(&wake_sleeper_q);
        if (deboost)
                rt_mutex_adjust_prio(current);
 
@@ -1822,6 +1827,16 @@ static int futex_requeue(u32 __user *uaddr1, unsigned int flags,
                                requeue_pi_wake_futex(this, &key2, hb2);
                                drop_count++;
                                continue;
+                       } else if (ret == -EAGAIN) {
+                               /*
+                                * Waiter was woken by timeout or
+                                * signal and has set pi_blocked_on to
+                                * PI_WAKEUP_INPROGRESS before we
+                                * tried to enqueue it on the rtmutex.
+                                */
+                               this->pi_state = NULL;
+                               free_pi_state(pi_state);
+                               continue;
                        } else if (ret) {
                                /* -EDEADLK */
                                this->pi_state = NULL;
@@ -2143,11 +2158,11 @@ static int fixup_owner(u32 __user *uaddr, struct futex_q *q, int locked)
                 * we returned due to timeout or signal without taking the
                 * rt_mutex. Too late.
                 */
-               raw_spin_lock(&q->pi_state->pi_mutex.wait_lock);
+               raw_spin_lock_irq(&q->pi_state->pi_mutex.wait_lock);
                owner = rt_mutex_owner(&q->pi_state->pi_mutex);
                if (!owner)
                        owner = rt_mutex_next_owner(&q->pi_state->pi_mutex);
-               raw_spin_unlock(&q->pi_state->pi_mutex.wait_lock);
+               raw_spin_unlock_irq(&q->pi_state->pi_mutex.wait_lock);
                ret = fixup_pi_state_owner(uaddr, q, owner);
                goto out;
        }
@@ -2694,7 +2709,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
 {
        struct hrtimer_sleeper timeout, *to = NULL;
        struct rt_mutex_waiter rt_waiter;
-       struct futex_hash_bucket *hb;
+       struct futex_hash_bucket *hb, *hb2;
        union futex_key key2 = FUTEX_KEY_INIT;
        struct futex_q q = futex_q_init;
        int res, ret;
@@ -2719,10 +2734,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
         * The waiter is allocated on our stack, manipulated by the requeue
         * code while we sleep on uaddr.
         */
-       debug_rt_mutex_init_waiter(&rt_waiter);
-       RB_CLEAR_NODE(&rt_waiter.pi_tree_entry);
-       RB_CLEAR_NODE(&rt_waiter.tree_entry);
-       rt_waiter.task = NULL;
+       rt_mutex_init_waiter(&rt_waiter, false);
 
        ret = get_futex_key(uaddr2, flags & FLAGS_SHARED, &key2, VERIFY_WRITE);
        if (unlikely(ret != 0))
@@ -2753,20 +2765,55 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
        /* Queue the futex_q, drop the hb lock, wait for wakeup. */
        futex_wait_queue_me(hb, &q, to);
 
-       spin_lock(&hb->lock);
-       ret = handle_early_requeue_pi_wakeup(hb, &q, &key2, to);
-       spin_unlock(&hb->lock);
-       if (ret)
-               goto out_put_keys;
+       /*
+        * On RT we must avoid races with requeue and trying to block
+        * on two mutexes (hb->lock and uaddr2's rtmutex) by
+        * serializing access to pi_blocked_on with pi_lock.
+        */
+       raw_spin_lock_irq(&current->pi_lock);
+       if (current->pi_blocked_on) {
+               /*
+                * We have been requeued or are in the process of
+                * being requeued.
+                */
+               raw_spin_unlock_irq(&current->pi_lock);
+       } else {
+               /*
+                * Setting pi_blocked_on to PI_WAKEUP_INPROGRESS
+                * prevents a concurrent requeue from moving us to the
+                * uaddr2 rtmutex. After that we can safely acquire
+                * (and possibly block on) hb->lock.
+                */
+               current->pi_blocked_on = PI_WAKEUP_INPROGRESS;
+               raw_spin_unlock_irq(&current->pi_lock);
+
+               spin_lock(&hb->lock);
+
+               /*
+                * Clean up pi_blocked_on. We might leak it otherwise
+                * when we succeeded with the hb->lock in the fast
+                * path.
+                */
+               raw_spin_lock_irq(&current->pi_lock);
+               current->pi_blocked_on = NULL;
+               raw_spin_unlock_irq(&current->pi_lock);
+
+               ret = handle_early_requeue_pi_wakeup(hb, &q, &key2, to);
+               spin_unlock(&hb->lock);
+               if (ret)
+                       goto out_put_keys;
+       }
 
        /*
-        * In order for us to be here, we know our q.key == key2, and since
-        * we took the hb->lock above, we also know that futex_requeue() has
-        * completed and we no longer have to concern ourselves with a wakeup
-        * race with the atomic proxy lock acquisition by the requeue code. The
-        * futex_requeue dropped our key1 reference and incremented our key2
-        * reference count.
+        * In order to be here, we have either been requeued, are in
+        * the process of being requeued, or requeue successfully
+        * acquired uaddr2 on our behalf.  If pi_blocked_on was
+        * non-null above, we may be racing with a requeue.  Do not
+        * rely on q->lock_ptr to be hb2->lock until after blocking on
+        * hb->lock or hb2->lock. The futex_requeue dropped our key1
+        * reference and incremented our key2 reference count.
         */
+       hb2 = hash_futex(&key2);
 
        /* Check if the requeue code acquired the second futex for us. */
        if (!q.rt_waiter) {
@@ -2775,7 +2822,8 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
                 * did a lock-steal - fix up the PI-state in that case.
                 */
                if (q.pi_state && (q.pi_state->owner != current)) {
-                       spin_lock(q.lock_ptr);
+                       spin_lock(&hb2->lock);
+                       BUG_ON(&hb2->lock != q.lock_ptr);
                        ret = fixup_pi_state_owner(uaddr2, &q, current);
                        if (ret && rt_mutex_owner(&q.pi_state->pi_mutex) == current)
                                rt_mutex_unlock(&q.pi_state->pi_mutex);
@@ -2784,7 +2832,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
                         * the requeue_pi() code acquired for us.
                         */
                        free_pi_state(q.pi_state);
-                       spin_unlock(q.lock_ptr);
+                       spin_unlock(&hb2->lock);
                }
        } else {
                struct rt_mutex *pi_mutex;
@@ -2799,7 +2847,8 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, unsigned int flags,
                ret = rt_mutex_finish_proxy_lock(pi_mutex, to, &rt_waiter);
                debug_rt_mutex_free_waiter(&rt_waiter);
 
-               spin_lock(q.lock_ptr);
+               spin_lock(&hb2->lock);
+               BUG_ON(&hb2->lock != q.lock_ptr);
                /*
                 * Fixup the pi_state owner and possibly acquire the lock if we
                 * haven't already.
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 57bff7857e87..6c65c9252991 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -134,6 +134,8 @@ void __irq_wake_thread(struct irq_desc *desc, struct irqaction *action)
 
 irqreturn_t handle_irq_event_percpu(struct irq_desc *desc)
 {
+       struct pt_regs *regs = get_irq_regs();
+       u64 ip = regs ? instruction_pointer(regs) : 0;
        irqreturn_t retval = IRQ_NONE;
        unsigned int flags = 0, irq = desc->irq_data.irq;
        struct irqaction *action = desc->action;
@@ -176,7 +178,11 @@ irqreturn_t handle_irq_event_percpu(struct irq_desc *desc)
                action = action->next;
        }
 
-       add_interrupt_randomness(irq, flags);
+#ifdef CONFIG_PREEMPT_RT_FULL
+       desc->random_ip = ip;
+#else
+       add_interrupt_randomness(irq, flags, ip);
+#endif
 
        if (!noirqdebug)
                note_interrupt(desc, retval);
diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c
index 239e2ae2c947..0b73349a42d5 100644
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -24,10 +24,27 @@
 static struct lock_class_key irq_desc_lock_class;
 
 #if defined(CONFIG_SMP)
+static int __init irq_affinity_setup(char *str)
+{
+       zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
+       cpulist_parse(str, irq_default_affinity);
+       /*
+        * Set at least the boot cpu. We don't want to end up with
+        * bugreports caused by random comandline masks
+        */
+       cpumask_set_cpu(smp_processor_id(), irq_default_affinity);
+       return 1;
+}
+__setup("irqaffinity=", irq_affinity_setup);
+
 static void __init init_irq_default_affinity(void)
 {
-       alloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
-       cpumask_setall(irq_default_affinity);
+#ifdef CONFIG_CPUMASK_OFFSTACK
+       if (!irq_default_affinity)
+               zalloc_cpumask_var(&irq_default_affinity, GFP_NOWAIT);
+#endif
+       if (cpumask_empty(irq_default_affinity))
+               cpumask_setall(irq_default_affinity);
 }
 #else
 static void __init init_irq_default_affinity(void)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index a079ed14f230..2cf55df7ad0e 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -22,6 +22,7 @@
 #include "internals.h"
 
 #ifdef CONFIG_IRQ_FORCED_THREADING
+# ifndef CONFIG_PREEMPT_RT_BASE
 __read_mostly bool force_irqthreads;
 
 static int __init setup_forced_irqthreads(char *arg)
@@ -30,6 +31,7 @@ static int __init setup_forced_irqthreads(char *arg)
        return 0;
 }
 early_param("threadirqs", setup_forced_irqthreads);
+# endif
 #endif
 
 static void __synchronize_hardirq(struct irq_desc *desc)
@@ -181,6 +183,62 @@ static inline void
 irq_get_pending(struct cpumask *mask, struct irq_desc *desc) { }
 #endif
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+static void _irq_affinity_notify(struct irq_affinity_notify *notify);
+static struct task_struct *set_affinity_helper;
+static LIST_HEAD(affinity_list);
+static DEFINE_RAW_SPINLOCK(affinity_list_lock);
+
+static int set_affinity_thread(void *unused)
+{
+       while (1) {
+               struct irq_affinity_notify *notify;
+               int empty;
+
+               set_current_state(TASK_INTERRUPTIBLE);
+
+               raw_spin_lock_irq(&affinity_list_lock);
+               empty = list_empty(&affinity_list);
+               raw_spin_unlock_irq(&affinity_list_lock);
+
+               if (empty)
+                       schedule();
+               if (kthread_should_stop())
+                       break;
+               set_current_state(TASK_RUNNING);
+try_next:
+               notify = NULL;
+
+               raw_spin_lock_irq(&affinity_list_lock);
+               if (!list_empty(&affinity_list)) {
+                       notify = list_first_entry(&affinity_list,
+                                       struct irq_affinity_notify, list);
+                       list_del_init(&notify->list);
+               }
+               raw_spin_unlock_irq(&affinity_list_lock);
+
+               if (!notify)
+                       continue;
+               _irq_affinity_notify(notify);
+               goto try_next;
+       }
+       return 0;
+}
+
+static void init_helper_thread(void)
+{
+       if (set_affinity_helper)
+               return;
+       set_affinity_helper = kthread_run(set_affinity_thread, NULL,
+                       "affinity-cb");
+       WARN_ON(IS_ERR(set_affinity_helper));
+}
+#else
+
+static inline void init_helper_thread(void) { }
+
+#endif
+
 int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
                        bool force)
 {
@@ -220,7 +278,17 @@ int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask,
 
        if (desc->affinity_notify) {
                kref_get(&desc->affinity_notify->kref);
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+               raw_spin_lock(&affinity_list_lock);
+               if (list_empty(&desc->affinity_notify->list))
+                       list_add_tail(&affinity_list,
+                                       &desc->affinity_notify->list);
+               raw_spin_unlock(&affinity_list_lock);
+               wake_up_process(set_affinity_helper);
+#else
                schedule_work(&desc->affinity_notify->work);
+#endif
        }
        irqd_set(data, IRQD_AFFINITY_SET);
 
@@ -258,10 +326,8 @@ int irq_set_affinity_hint(unsigned int irq, const struct cpumask *m)
 }
 EXPORT_SYMBOL_GPL(irq_set_affinity_hint);
 
-static void irq_affinity_notify(struct work_struct *work)
+static void _irq_affinity_notify(struct irq_affinity_notify *notify)
 {
-       struct irq_affinity_notify *notify =
-               container_of(work, struct irq_affinity_notify, work);
        struct irq_desc *desc = irq_to_desc(notify->irq);
        cpumask_var_t cpumask;
        unsigned long flags;
@@ -283,6 +349,13 @@ static void irq_affinity_notify(struct work_struct *work)
        kref_put(&notify->kref, notify->release);
 }
 
+static void irq_affinity_notify(struct work_struct *work)
+{
+       struct irq_affinity_notify *notify =
+               container_of(work, struct irq_affinity_notify, work);
+       _irq_affinity_notify(notify);
+}
+
 /**
  *     irq_set_affinity_notifier - control notification of IRQ affinity changes
  *     @irq:           Interrupt for which to enable/disable notification
@@ -312,6 +385,8 @@ irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
                notify->irq = irq;
                kref_init(&notify->kref);
                INIT_WORK(&notify->work, irq_affinity_notify);
+               INIT_LIST_HEAD(&notify->list);
+               init_helper_thread();
        }
 
        raw_spin_lock_irqsave(&desc->lock, flags);
@@ -865,7 +940,15 @@ irq_forced_thread_fn(struct irq_desc *desc, struct irqaction *action)
        local_bh_disable();
        ret = action->thread_fn(action->irq, action->dev_id);
        irq_finalize_oneshot(desc, action);
-       local_bh_enable();
+       /*
+        * Interrupts which have real time requirements can be set up
+        * to avoid softirq processing in the thread handler. This is
+        * safe as these interrupts do not raise soft interrupts.
+        */
+       if (irq_settings_no_softirq_call(desc))
+               _local_bh_enable();
+       else
+               local_bh_enable();
        return ret;
 }
 
@@ -962,6 +1045,12 @@ static int irq_thread(void *data)
                if (action_ret == IRQ_WAKE_THREAD)
                        irq_wake_secondary(desc, action);
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+               migrate_disable();
+               add_interrupt_randomness(action->irq, 0,
+                                desc->random_ip ^ (unsigned long) action);
+               migrate_enable();
+#endif
                wake_threads_waitq(desc);
        }
 
@@ -1317,6 +1406,9 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
                        irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
                }
 
+               if (new->flags & IRQF_NO_SOFTIRQ_CALL)
+                       irq_settings_set_no_softirq_call(desc);
+
                /* Set default affinity mask once everything is setup */
                setup_affinity(desc, mask);
 
@@ -1970,7 +2062,7 @@ EXPORT_SYMBOL_GPL(irq_get_irqchip_state);
  *     This call sets the internal irqchip state of an interrupt,
  *     depending on the value of @which.
  *
- *     This function should be called with preemption disabled if the
+ *     This function should be called with migration disabled if the
  *     interrupt controller has per-cpu registers.
  */
 int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
diff --git a/kernel/irq/settings.h b/kernel/irq/settings.h
index 320579d89091..2df2d4445b1e 100644
--- a/kernel/irq/settings.h
+++ b/kernel/irq/settings.h
@@ -16,6 +16,7 @@ enum {
        _IRQ_PER_CPU_DEVID      = IRQ_PER_CPU_DEVID,
        _IRQ_IS_POLLED          = IRQ_IS_POLLED,
        _IRQ_DISABLE_UNLAZY     = IRQ_DISABLE_UNLAZY,
+       _IRQ_NO_SOFTIRQ_CALL    = IRQ_NO_SOFTIRQ_CALL,
        _IRQF_MODIFY_MASK       = IRQF_MODIFY_MASK,
 };
 
@@ -30,6 +31,7 @@ enum {
 #define IRQ_PER_CPU_DEVID      GOT_YOU_MORON
 #define IRQ_IS_POLLED          GOT_YOU_MORON
 #define IRQ_DISABLE_UNLAZY     GOT_YOU_MORON
+#define IRQ_NO_SOFTIRQ_CALL    GOT_YOU_MORON
 #undef IRQF_MODIFY_MASK
 #define IRQF_MODIFY_MASK       GOT_YOU_MORON
 
@@ -40,6 +42,16 @@ irq_settings_clr_and_set(struct irq_desc *desc, u32 clr, u32 set)
        desc->status_use_accessors |= (set & _IRQF_MODIFY_MASK);
 }
 
+static inline bool irq_settings_no_softirq_call(struct irq_desc *desc)
+{
+       return desc->status_use_accessors & _IRQ_NO_SOFTIRQ_CALL;
+}
+
+static inline void irq_settings_set_no_softirq_call(struct irq_desc *desc)
+{
+       desc->status_use_accessors |= _IRQ_NO_SOFTIRQ_CALL;
+}
+
 static inline bool irq_settings_is_per_cpu(struct irq_desc *desc)
 {
        return desc->status_use_accessors & _IRQ_PER_CPU;
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index 32144175458d..ed26f2554972 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -444,6 +444,10 @@ MODULE_PARM_DESC(noirqdebug, "Disable irq lockup detection when true");
 
 static int __init irqfixup_setup(char *str)
 {
+#ifdef CONFIG_PREEMPT_RT_BASE
+       pr_warn("irqfixup boot option not supported w/ CONFIG_PREEMPT_RT_BASE\n");
+       return 1;
+#endif
        irqfixup = 1;
        printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n");
        printk(KERN_WARNING "This may impact system performance.\n");
@@ -456,6 +460,10 @@ module_param(irqfixup, int, 0644);
 
 static int __init irqpoll_setup(char *str)
 {
+#ifdef CONFIG_PREEMPT_RT_BASE
+       pr_warn("irqpoll boot option not supported w/ CONFIG_PREEMPT_RT_BASE\n");
+       return 1;
+#endif
        irqfixup = 2;
        printk(KERN_WARNING "Misrouted IRQ fixup and polling support "
                                "enabled\n");
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index bcf107ce0854..2899ba0d23d1 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c
@@ -17,6 +17,7 @@
 #include <linux/cpu.h>
 #include <linux/notifier.h>
 #include <linux/smp.h>
+#include <linux/interrupt.h>
 #include <asm/processor.h>
 
 
@@ -65,6 +66,8 @@ void __weak arch_irq_work_raise(void)
  */
 bool irq_work_queue_on(struct irq_work *work, int cpu)
 {
+       struct llist_head *list;
+
        /* All work should have been flushed before going offline */
        WARN_ON_ONCE(cpu_is_offline(cpu));
 
@@ -75,7 +78,12 @@ bool irq_work_queue_on(struct irq_work *work, int cpu)
        if (!irq_work_claim(work))
                return false;
 
-       if (llist_add(&work->llnode, &per_cpu(raised_list, cpu)))
+       if (IS_ENABLED(CONFIG_PREEMPT_RT_FULL) && !(work->flags & IRQ_WORK_HARD_IRQ))
+               list = &per_cpu(lazy_list, cpu);
+       else
+               list = &per_cpu(raised_list, cpu);
+
+       if (llist_add(&work->llnode, list))
                arch_send_call_function_single_ipi(cpu);
 
        return true;
@@ -86,6 +94,9 @@ EXPORT_SYMBOL_GPL(irq_work_queue_on);
 /* Enqueue the irq work @work on the current CPU */
 bool irq_work_queue(struct irq_work *work)
 {
+       struct llist_head *list;
+       bool lazy_work, realtime = IS_ENABLED(CONFIG_PREEMPT_RT_FULL);
+
        /* Only queue if not already pending */
        if (!irq_work_claim(work))
                return false;
@@ -93,13 +104,15 @@ bool irq_work_queue(struct irq_work *work)
        /* Queue the entry and raise the IPI if needed. */
        preempt_disable();
 
-       /* If the work is "lazy", handle it from next tick if any */
-       if (work->flags & IRQ_WORK_LAZY) {
-               if (llist_add(&work->llnode, this_cpu_ptr(&lazy_list)) &&
-                   tick_nohz_tick_stopped())
-                       arch_irq_work_raise();
-       } else {
-               if (llist_add(&work->llnode, this_cpu_ptr(&raised_list)))
+       lazy_work = work->flags & IRQ_WORK_LAZY;
+
+       if (lazy_work || (realtime && !(work->flags & IRQ_WORK_HARD_IRQ)))
+               list = this_cpu_ptr(&lazy_list);
+       else
+               list = this_cpu_ptr(&raised_list);
+
+       if (llist_add(&work->llnode, list)) {
+               if (!lazy_work || tick_nohz_tick_stopped())
                        arch_irq_work_raise();
        }
 
@@ -116,9 +129,8 @@ bool irq_work_needs_cpu(void)
        raised = this_cpu_ptr(&raised_list);
        lazy = this_cpu_ptr(&lazy_list);
 
-       if (llist_empty(raised) || arch_irq_work_has_interrupt())
-               if (llist_empty(lazy))
-                       return false;
+       if (llist_empty(raised) && llist_empty(lazy))
+               return false;
 
        /* All work should have been flushed before going offline */
        WARN_ON_ONCE(cpu_is_offline(smp_processor_id()));
@@ -132,7 +144,7 @@ static void irq_work_run_list(struct llist_head *list)
        struct irq_work *work;
        struct llist_node *llnode;
 
-       BUG_ON(!irqs_disabled());
+       BUG_ON_NONRT(!irqs_disabled());
 
        if (llist_empty(list))
                return;
@@ -169,7 +181,16 @@ static void irq_work_run_list(struct llist_head *list)
 void irq_work_run(void)
 {
        irq_work_run_list(this_cpu_ptr(&raised_list));
-       irq_work_run_list(this_cpu_ptr(&lazy_list));
+       if (IS_ENABLED(CONFIG_PREEMPT_RT_FULL)) {
+               /*
+                * NOTE: we raise softirq via IPI for safety,
+                * and execute in irq_work_tick() to move the
+                * overhead from hard to soft irq context.
+                */
+               if (!llist_empty(this_cpu_ptr(&lazy_list)))
+                       raise_softirq(TIMER_SOFTIRQ);
+       } else
+               irq_work_run_list(this_cpu_ptr(&lazy_list));
 }
 EXPORT_SYMBOL_GPL(irq_work_run);
 
@@ -179,8 +200,17 @@ void irq_work_tick(void)
 
        if (!llist_empty(raised) && !arch_irq_work_has_interrupt())
                irq_work_run_list(raised);
+
+       if (!IS_ENABLED(CONFIG_PREEMPT_RT_FULL))
+               irq_work_run_list(this_cpu_ptr(&lazy_list));
+}
+
+#if defined(CONFIG_IRQ_WORK) && defined(CONFIG_PREEMPT_RT_FULL)
+void irq_work_tick_soft(void)
+{
        irq_work_run_list(this_cpu_ptr(&lazy_list));
 }
+#endif
 
 /*
  * Synchronize against the irq_work @entry, ensures the entry is not
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index e83b26464061..c0e08d1cf33e 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -136,6 +136,15 @@ KERNEL_ATTR_RO(vmcoreinfo);
 
 #endif /* CONFIG_KEXEC_CORE */
 
+#if defined(CONFIG_PREEMPT_RT_FULL)
+static ssize_t  realtime_show(struct kobject *kobj,
+                             struct kobj_attribute *attr, char *buf)
+{
+       return sprintf(buf, "%d\n", 1);
+}
+KERNEL_ATTR_RO(realtime);
+#endif
+
 /* whether file capabilities are enabled */
 static ssize_t fscaps_show(struct kobject *kobj,
                                  struct kobj_attribute *attr, char *buf)
@@ -203,6 +212,9 @@ static struct attribute * kernel_attrs[] = {
        &vmcoreinfo_attr.attr,
 #endif
        &rcu_expedited_attr.attr,
+#ifdef CONFIG_PREEMPT_RT_FULL
+       &realtime_attr.attr,
+#endif
        NULL
 };
 
diff --git a/kernel/locking/Makefile b/kernel/locking/Makefile
index 8e96f6cc2a4a..447b03082d88 100644
--- a/kernel/locking/Makefile
+++ b/kernel/locking/Makefile
@@ -1,5 +1,5 @@
 
-obj-y += mutex.o semaphore.o rwsem.o percpu-rwsem.o
+obj-y += semaphore.o percpu-rwsem.o
 
 ifdef CONFIG_FUNCTION_TRACER
 CFLAGS_REMOVE_lockdep.o = $(CC_FLAGS_FTRACE)
@@ -8,7 +8,11 @@ CFLAGS_REMOVE_mutex-debug.o = $(CC_FLAGS_FTRACE)
 CFLAGS_REMOVE_rtmutex-debug.o = $(CC_FLAGS_FTRACE)
 endif
 
+ifneq ($(CONFIG_PREEMPT_RT_FULL),y)
+obj-y += mutex.o
 obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
+obj-y += rwsem.o
+endif
 obj-$(CONFIG_LOCKDEP) += lockdep.o
 ifeq ($(CONFIG_PROC_FS),y)
 obj-$(CONFIG_LOCKDEP) += lockdep_proc.o
@@ -22,7 +26,10 @@ obj-$(CONFIG_RT_MUTEXES) += rtmutex.o
 obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o
 obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
 obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock_debug.o
+ifneq ($(CONFIG_PREEMPT_RT_FULL),y)
 obj-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
 obj-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem-xadd.o
+endif
+obj-$(CONFIG_PREEMPT_RT_FULL) += rt.o
 obj-$(CONFIG_QUEUED_RWLOCKS) += qrwlock.o
 obj-$(CONFIG_LOCK_TORTURE_TEST) += locktorture.o
diff --git a/kernel/locking/lglock.c b/kernel/locking/lglock.c
index 951cfcd10b4a..57e0ea72c28a 100644
--- a/kernel/locking/lglock.c
+++ b/kernel/locking/lglock.c
@@ -4,6 +4,15 @@
 #include <linux/cpu.h>
 #include <linux/string.h>
 
+#ifndef CONFIG_PREEMPT_RT_FULL
+# define lg_lock_ptr           arch_spinlock_t
+# define lg_do_lock(l)         arch_spin_lock(l)
+# define lg_do_unlock(l)       arch_spin_unlock(l)
+#else
+# define lg_lock_ptr           struct rt_mutex
+# define lg_do_lock(l)         __rt_spin_lock__no_mg(l)
+# define lg_do_unlock(l)       __rt_spin_unlock(l)
+#endif
 /*
  * Note there is no uninit, so lglocks cannot be defined in
  * modules (but it's fine to use them from there)
@@ -12,51 +21,60 @@
 
 void lg_lock_init(struct lglock *lg, char *name)
 {
+#ifdef CONFIG_PREEMPT_RT_FULL
+       int i;
+
+       for_each_possible_cpu(i) {
+               struct rt_mutex *lock = per_cpu_ptr(lg->lock, i);
+
+               rt_mutex_init(lock);
+       }
+#endif
        LOCKDEP_INIT_MAP(&lg->lock_dep_map, name, &lg->lock_key, 0);
 }
 EXPORT_SYMBOL(lg_lock_init);
 
 void lg_local_lock(struct lglock *lg)
 {
-       arch_spinlock_t *lock;
+       lg_lock_ptr *lock;
 
-       preempt_disable();
+       migrate_disable();
        lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
        lock = this_cpu_ptr(lg->lock);
-       arch_spin_lock(lock);
+       lg_do_lock(lock);
 }
 EXPORT_SYMBOL(lg_local_lock);
 
 void lg_local_unlock(struct lglock *lg)
 {
-       arch_spinlock_t *lock;
+       lg_lock_ptr *lock;
 
        lock_release(&lg->lock_dep_map, 1, _RET_IP_);
        lock = this_cpu_ptr(lg->lock);
-       arch_spin_unlock(lock);
-       preempt_enable();
+       lg_do_unlock(lock);
+       migrate_enable();
 }
 EXPORT_SYMBOL(lg_local_unlock);
 
 void lg_local_lock_cpu(struct lglock *lg, int cpu)
 {
-       arch_spinlock_t *lock;
+       lg_lock_ptr *lock;
 
-       preempt_disable();
+       preempt_disable_nort();
        lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
        lock = per_cpu_ptr(lg->lock, cpu);
-       arch_spin_lock(lock);
+       lg_do_lock(lock);
 }
 EXPORT_SYMBOL(lg_local_lock_cpu);
 
 void lg_local_unlock_cpu(struct lglock *lg, int cpu)
 {
-       arch_spinlock_t *lock;
+       lg_lock_ptr *lock;
 
        lock_release(&lg->lock_dep_map, 1, _RET_IP_);
        lock = per_cpu_ptr(lg->lock, cpu);
-       arch_spin_unlock(lock);
-       preempt_enable();
+       lg_do_unlock(lock);
+       preempt_enable_nort();
 }
 EXPORT_SYMBOL(lg_local_unlock_cpu);
 
@@ -68,30 +86,30 @@ void lg_double_lock(struct lglock *lg, int cpu1, int cpu2)
        if (cpu2 < cpu1)
                swap(cpu1, cpu2);
 
-       preempt_disable();
+       preempt_disable_nort();
        lock_acquire_shared(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
-       arch_spin_lock(per_cpu_ptr(lg->lock, cpu1));
-       arch_spin_lock(per_cpu_ptr(lg->lock, cpu2));
+       lg_do_lock(per_cpu_ptr(lg->lock, cpu1));
+       lg_do_lock(per_cpu_ptr(lg->lock, cpu2));
 }
 
 void lg_double_unlock(struct lglock *lg, int cpu1, int cpu2)
 {
        lock_release(&lg->lock_dep_map, 1, _RET_IP_);
-       arch_spin_unlock(per_cpu_ptr(lg->lock, cpu1));
-       arch_spin_unlock(per_cpu_ptr(lg->lock, cpu2));
-       preempt_enable();
+       lg_do_unlock(per_cpu_ptr(lg->lock, cpu1));
+       lg_do_unlock(per_cpu_ptr(lg->lock, cpu2));
+       preempt_enable_nort();
 }
 
 void lg_global_lock(struct lglock *lg)
 {
        int i;
 
-       preempt_disable();
+       preempt_disable_nort();
        lock_acquire_exclusive(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
        for_each_possible_cpu(i) {
-               arch_spinlock_t *lock;
+               lg_lock_ptr *lock;
                lock = per_cpu_ptr(lg->lock, i);
-               arch_spin_lock(lock);
+               lg_do_lock(lock);
        }
 }
 EXPORT_SYMBOL(lg_global_lock);
@@ -102,10 +120,35 @@ void lg_global_unlock(struct lglock *lg)
 
        lock_release(&lg->lock_dep_map, 1, _RET_IP_);
        for_each_possible_cpu(i) {
-               arch_spinlock_t *lock;
+               lg_lock_ptr *lock;
                lock = per_cpu_ptr(lg->lock, i);
-               arch_spin_unlock(lock);
+               lg_do_unlock(lock);
        }
-       preempt_enable();
+       preempt_enable_nort();
 }
 EXPORT_SYMBOL(lg_global_unlock);
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+/*
+ * HACK: If you use this, you get to keep the pieces.
+ * Used in queue_stop_cpus_work() when stop machinery
+ * is called from inactive CPU, so we can't schedule.
+ */
+# define lg_do_trylock_relax(l)                        \
+       do {                                    \
+               while (!__rt_spin_trylock(l))   \
+                       cpu_relax();            \
+       } while (0)
+
+void lg_global_trylock_relax(struct lglock *lg)
+{
+       int i;
+
+       lock_acquire_exclusive(&lg->lock_dep_map, 0, 0, NULL, _RET_IP_);
+       for_each_possible_cpu(i) {
+               lg_lock_ptr *lock;
+               lock = per_cpu_ptr(lg->lock, i);
+               lg_do_trylock_relax(lock);
+       }
+}
+#endif
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c
index 0e2c4911ba61..aed13ffa9fd3 100644
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -668,6 +668,7 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass)
        struct lockdep_subclass_key *key;
        struct list_head *hash_head;
        struct lock_class *class;
+       bool is_static = false;
 
 #ifdef CONFIG_DEBUG_LOCKDEP
        /*
@@ -695,10 +696,23 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass)
 
        /*
         * Static locks do not have their class-keys yet - for them the key
-        * is the lock object itself:
+        * is the lock object itself. If the lock is in the per cpu area,
+        * the canonical address of the lock (per cpu offset removed) is
+        * used.
         */
-       if (unlikely(!lock->key))
-               lock->key = (void *)lock;
+       if (unlikely(!lock->key)) {
+               unsigned long can_addr, addr = (unsigned long)lock;
+
+               if (__is_kernel_percpu_address(addr, &can_addr))
+                       lock->key = (void *)can_addr;
+               else if (__is_module_percpu_address(addr, &can_addr))
+                       lock->key = (void *)can_addr;
+               else if (static_obj(lock))
+                       lock->key = (void *)lock;
+               else
+                       return ERR_PTR(-EINVAL);
+               is_static = true;
+       }
 
        /*
         * NOTE: the class-key must be unique. For dynamic locks, a static
@@ -730,7 +744,7 @@ look_up_lock_class(struct lockdep_map *lock, unsigned int subclass)
                }
        }
 
-       return NULL;
+       return is_static || static_obj(lock->key) ? NULL : ERR_PTR(-EINVAL);
 }
 
 /*
@@ -748,19 +762,18 @@ register_lock_class(struct lockdep_map *lock, unsigned int subclass, int force)
        DEBUG_LOCKS_WARN_ON(!irqs_disabled());
 
        class = look_up_lock_class(lock, subclass);
-       if (likely(class))
+       if (likely(!IS_ERR_OR_NULL(class)))
                goto out_set_class_cache;
 
        /*
         * Debug-check: all keys must be persistent!
-        */
-       if (!static_obj(lock->key)) {
+        */
+       if (IS_ERR(class)) {
                debug_locks_off();
                printk("INFO: trying to register non-static key.\n");
                printk("the code is fine but needs lockdep annotation.\n");
                printk("turning off the locking correctness validator.\n");
                dump_stack();
-
                return NULL;
        }
 
@@ -3285,7 +3298,7 @@ static int match_held_lock(struct held_lock *hlock, struct lockdep_map *lock)
                 * Clearly if the lock hasn't been acquired _ever_, we're not
                 * holding it either, so report failure.
                 */
-               if (!class)
+               if (IS_ERR_OR_NULL(class))
                        return 0;
 
                /*
@@ -3532,6 +3545,7 @@ static void check_flags(unsigned long flags)
                }
        }
 
+#ifndef CONFIG_PREEMPT_RT_FULL
        /*
         * We dont accurately track softirq state in e.g.
         * hardirq contexts (such as on 4KSTACKS), so only
@@ -3546,6 +3560,7 @@ static void check_flags(unsigned long flags)
                        DEBUG_LOCKS_WARN_ON(!current->softirqs_enabled);
                }
        }
+#endif
 
        if (!debug_locks)
                print_irqtrace_events(current);
@@ -3984,7 +3999,7 @@ void lockdep_reset_lock(struct lockdep_map *lock)
                 * If the class exists we look it up and zap it:
                 */
                class = look_up_lock_class(lock, j);
-               if (class)
+               if (!IS_ERR_OR_NULL(class))
                        zap_class(class);
        }
        /*
diff --git a/kernel/locking/locktorture.c b/kernel/locking/locktorture.c
index d580b7d6ee6d..4680c502b65b 100644
--- a/kernel/locking/locktorture.c
+++ b/kernel/locking/locktorture.c
@@ -26,7 +26,6 @@
 #include <linux/kthread.h>
 #include <linux/sched/rt.h>
 #include <linux/spinlock.h>
-#include <linux/rwlock.h>
 #include <linux/mutex.h>
 #include <linux/rwsem.h>
 #include <linux/smp.h>
diff --git a/kernel/locking/rt.c b/kernel/locking/rt.c
new file mode 100644
index 000000000000..d4ab61c1848b
--- /dev/null
+++ b/kernel/locking/rt.c
@@ -0,0 +1,474 @@
+/*
+ * kernel/rt.c
+ *
+ * Real-Time Preemption Support
+ *
+ * started by Ingo Molnar:
+ *
+ *  Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ *  Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
+ *
+ * historic credit for proving that Linux spinlocks can be implemented via
+ * RT-aware mutexes goes to many people: The Pmutex project (Dirk Grambow
+ * and others) who prototyped it on 2.4 and did lots of comparative
+ * research and analysis; TimeSys, for proving that you can implement a
+ * fully preemptible kernel via the use of IRQ threading and mutexes;
+ * Bill Huey for persuasively arguing on lkml that the mutex model is the
+ * right one; and to MontaVista, who ported pmutexes to 2.6.
+ *
+ * This code is a from-scratch implementation and is not based on pmutexes,
+ * but the idea of converting spinlocks to mutexes is used here too.
+ *
+ * lock debugging, locking tree, deadlock detection:
+ *
+ *  Copyright (C) 2004, LynuxWorks, Inc., Igor Manyilov, Bill Huey
+ *  Released under the General Public License (GPL).
+ *
+ * Includes portions of the generic R/W semaphore implementation from:
+ *
+ *  Copyright (c) 2001   David Howells (dhowells@redhat.com).
+ *  - Derived partially from idea by Andrea Arcangeli <andrea@suse.de>
+ *  - Derived also from comments by Linus
+ *
+ * Pending ownership of locks and ownership stealing:
+ *
+ *  Copyright (C) 2005, Kihon Technologies Inc., Steven Rostedt
+ *
+ *   (also by Steven Rostedt)
+ *    - Converted single pi_lock to individual task locks.
+ *
+ * By Esben Nielsen:
+ *    Doing priority inheritance with help of the scheduler.
+ *
+ *  Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
+ *  - major rework based on Esben Nielsens initial patch
+ *  - replaced thread_info references by task_struct refs
+ *  - removed task->pending_owner dependency
+ *  - BKL drop/reacquire for semaphore style locks to avoid deadlocks
+ *    in the scheduler return path as discussed with Steven Rostedt
+ *
+ *  Copyright (C) 2006, Kihon Technologies Inc.
+ *    Steven Rostedt <rostedt@goodmis.org>
+ *  - debugged and patched Thomas Gleixner's rework.
+ *  - added back the cmpxchg to the rework.
+ *  - turned atomic require back on for SMP.
+ */
+
+#include <linux/spinlock.h>
+#include <linux/rtmutex.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/syscalls.h>
+#include <linux/interrupt.h>
+#include <linux/plist.h>
+#include <linux/fs.h>
+#include <linux/futex.h>
+#include <linux/hrtimer.h>
+
+#include "rtmutex_common.h"
+
+/*
+ * struct mutex functions
+ */
+void __mutex_do_init(struct mutex *mutex, const char *name,
+                    struct lock_class_key *key)
+{
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+       /*
+        * Make sure we are not reinitializing a held lock:
+        */
+       debug_check_no_locks_freed((void *)mutex, sizeof(*mutex));
+       lockdep_init_map(&mutex->dep_map, name, key, 0);
+#endif
+       mutex->lock.save_state = 0;
+}
+EXPORT_SYMBOL(__mutex_do_init);
+
+void __lockfunc _mutex_lock(struct mutex *lock)
+{
+       mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_);
+       rt_mutex_lock(&lock->lock);
+}
+EXPORT_SYMBOL(_mutex_lock);
+
+int __lockfunc _mutex_lock_interruptible(struct mutex *lock)
+{
+       int ret;
+
+       mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_);
+       ret = rt_mutex_lock_interruptible(&lock->lock);
+       if (ret)
+               mutex_release(&lock->dep_map, 1, _RET_IP_);
+       return ret;
+}
+EXPORT_SYMBOL(_mutex_lock_interruptible);
+
+int __lockfunc _mutex_lock_killable(struct mutex *lock)
+{
+       int ret;
+
+       mutex_acquire(&lock->dep_map, 0, 0, _RET_IP_);
+       ret = rt_mutex_lock_killable(&lock->lock);
+       if (ret)
+               mutex_release(&lock->dep_map, 1, _RET_IP_);
+       return ret;
+}
+EXPORT_SYMBOL(_mutex_lock_killable);
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+void __lockfunc _mutex_lock_nested(struct mutex *lock, int subclass)
+{
+       mutex_acquire_nest(&lock->dep_map, subclass, 0, NULL, _RET_IP_);
+       rt_mutex_lock(&lock->lock);
+}
+EXPORT_SYMBOL(_mutex_lock_nested);
+
+void __lockfunc _mutex_lock_nest_lock(struct mutex *lock, struct lockdep_map *nest)
+{
+       mutex_acquire_nest(&lock->dep_map, 0, 0, nest, _RET_IP_);
+       rt_mutex_lock(&lock->lock);
+}
+EXPORT_SYMBOL(_mutex_lock_nest_lock);
+
+int __lockfunc _mutex_lock_interruptible_nested(struct mutex *lock, int subclass)
+{
+       int ret;
+
+       mutex_acquire_nest(&lock->dep_map, subclass, 0, NULL, _RET_IP_);
+       ret = rt_mutex_lock_interruptible(&lock->lock);
+       if (ret)
+               mutex_release(&lock->dep_map, 1, _RET_IP_);
+       return ret;
+}
+EXPORT_SYMBOL(_mutex_lock_interruptible_nested);
+
+int __lockfunc _mutex_lock_killable_nested(struct mutex *lock, int subclass)
+{
+       int ret;
+
+       mutex_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+       ret = rt_mutex_lock_killable(&lock->lock);
+       if (ret)
+               mutex_release(&lock->dep_map, 1, _RET_IP_);
+       return ret;
+}
+EXPORT_SYMBOL(_mutex_lock_killable_nested);
+#endif
+
+int __lockfunc _mutex_trylock(struct mutex *lock)
+{
+       int ret = rt_mutex_trylock(&lock->lock);
+
+       if (ret)
+               mutex_acquire(&lock->dep_map, 0, 1, _RET_IP_);
+
+       return ret;
+}
+EXPORT_SYMBOL(_mutex_trylock);
+
+void __lockfunc _mutex_unlock(struct mutex *lock)
+{
+       mutex_release(&lock->dep_map, 1, _RET_IP_);
+       rt_mutex_unlock(&lock->lock);
+}
+EXPORT_SYMBOL(_mutex_unlock);
+
+/*
+ * rwlock_t functions
+ */
+int __lockfunc rt_write_trylock(rwlock_t *rwlock)
+{
+       int ret;
+
+       migrate_disable();
+       ret = rt_mutex_trylock(&rwlock->lock);
+       if (ret)
+               rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_);
+       else
+               migrate_enable();
+
+       return ret;
+}
+EXPORT_SYMBOL(rt_write_trylock);
+
+int __lockfunc rt_write_trylock_irqsave(rwlock_t *rwlock, unsigned long *flags)
+{
+       int ret;
+
+       *flags = 0;
+       ret = rt_write_trylock(rwlock);
+       return ret;
+}
+EXPORT_SYMBOL(rt_write_trylock_irqsave);
+
+int __lockfunc rt_read_trylock(rwlock_t *rwlock)
+{
+       struct rt_mutex *lock = &rwlock->lock;
+       int ret = 1;
+
+       /*
+        * recursive read locks succeed when current owns the lock,
+        * but not when read_depth == 0 which means that the lock is
+        * write locked.
+        */
+       if (rt_mutex_owner(lock) != current) {
+               migrate_disable();
+               ret = rt_mutex_trylock(lock);
+               if (ret)
+                       rwlock_acquire(&rwlock->dep_map, 0, 1, _RET_IP_);
+               else
+                       migrate_enable();
+
+       } else if (!rwlock->read_depth) {
+               ret = 0;
+       }
+
+       if (ret)
+               rwlock->read_depth++;
+
+       return ret;
+}
+EXPORT_SYMBOL(rt_read_trylock);
+
+void __lockfunc rt_write_lock(rwlock_t *rwlock)
+{
+       rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_);
+       __rt_spin_lock(&rwlock->lock);
+}
+EXPORT_SYMBOL(rt_write_lock);
+
+void __lockfunc rt_read_lock(rwlock_t *rwlock)
+{
+       struct rt_mutex *lock = &rwlock->lock;
+
+
+       /*
+        * recursive read locks succeed when current owns the lock
+        */
+       if (rt_mutex_owner(lock) != current) {
+               rwlock_acquire(&rwlock->dep_map, 0, 0, _RET_IP_);
+               __rt_spin_lock(lock);
+       }
+       rwlock->read_depth++;
+}
+
+EXPORT_SYMBOL(rt_read_lock);
+
+void __lockfunc rt_write_unlock(rwlock_t *rwlock)
+{
+       /* NOTE: we always pass in '1' for nested, for simplicity */
+       rwlock_release(&rwlock->dep_map, 1, _RET_IP_);
+       __rt_spin_unlock(&rwlock->lock);
+       migrate_enable();
+}
+EXPORT_SYMBOL(rt_write_unlock);
+
+void __lockfunc rt_read_unlock(rwlock_t *rwlock)
+{
+       /* Release the lock only when read_depth is down to 0 */
+       if (--rwlock->read_depth == 0) {
+               rwlock_release(&rwlock->dep_map, 1, _RET_IP_);
+               __rt_spin_unlock(&rwlock->lock);
+               migrate_enable();
+       }
+}
+EXPORT_SYMBOL(rt_read_unlock);
+
+unsigned long __lockfunc rt_write_lock_irqsave(rwlock_t *rwlock)
+{
+       rt_write_lock(rwlock);
+
+       return 0;
+}
+EXPORT_SYMBOL(rt_write_lock_irqsave);
+
+unsigned long __lockfunc rt_read_lock_irqsave(rwlock_t *rwlock)
+{
+       rt_read_lock(rwlock);
+
+       return 0;
+}
+EXPORT_SYMBOL(rt_read_lock_irqsave);
+
+void __rt_rwlock_init(rwlock_t *rwlock, char *name, struct lock_class_key *key)
+{
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+       /*
+        * Make sure we are not reinitializing a held lock:
+        */
+       debug_check_no_locks_freed((void *)rwlock, sizeof(*rwlock));
+       lockdep_init_map(&rwlock->dep_map, name, key, 0);
+#endif
+       rwlock->lock.save_state = 1;
+       rwlock->read_depth = 0;
+}
+EXPORT_SYMBOL(__rt_rwlock_init);
+
+/*
+ * rw_semaphores
+ */
+
+void  rt_up_write(struct rw_semaphore *rwsem)
+{
+       rwsem_release(&rwsem->dep_map, 1, _RET_IP_);
+       rt_mutex_unlock(&rwsem->lock);
+}
+EXPORT_SYMBOL(rt_up_write);
+
+void __rt_up_read(struct rw_semaphore *rwsem)
+{
+       if (--rwsem->read_depth == 0)
+               rt_mutex_unlock(&rwsem->lock);
+}
+
+void  rt_up_read(struct rw_semaphore *rwsem)
+{
+       rwsem_release(&rwsem->dep_map, 1, _RET_IP_);
+       __rt_up_read(rwsem);
+}
+EXPORT_SYMBOL(rt_up_read);
+
+/*
+ * downgrade a write lock into a read lock
+ * - just wake up any readers at the front of the queue
+ */
+void  rt_downgrade_write(struct rw_semaphore *rwsem)
+{
+       BUG_ON(rt_mutex_owner(&rwsem->lock) != current);
+       rwsem->read_depth = 1;
+}
+EXPORT_SYMBOL(rt_downgrade_write);
+
+int  rt_down_write_trylock(struct rw_semaphore *rwsem)
+{
+       int ret = rt_mutex_trylock(&rwsem->lock);
+
+       if (ret)
+               rwsem_acquire(&rwsem->dep_map, 0, 1, _RET_IP_);
+       return ret;
+}
+EXPORT_SYMBOL(rt_down_write_trylock);
+
+void  rt_down_write(struct rw_semaphore *rwsem)
+{
+       rwsem_acquire(&rwsem->dep_map, 0, 0, _RET_IP_);
+       rt_mutex_lock(&rwsem->lock);
+}
+EXPORT_SYMBOL(rt_down_write);
+
+void  rt_down_write_nested(struct rw_semaphore *rwsem, int subclass)
+{
+       rwsem_acquire(&rwsem->dep_map, subclass, 0, _RET_IP_);
+       rt_mutex_lock(&rwsem->lock);
+}
+EXPORT_SYMBOL(rt_down_write_nested);
+
+void rt_down_write_nested_lock(struct rw_semaphore *rwsem,
+                              struct lockdep_map *nest)
+{
+       rwsem_acquire_nest(&rwsem->dep_map, 0, 0, nest, _RET_IP_);
+       rt_mutex_lock(&rwsem->lock);
+}
+EXPORT_SYMBOL(rt_down_write_nested_lock);
+
+int rt__down_read_trylock(struct rw_semaphore *rwsem)
+{
+       struct rt_mutex *lock = &rwsem->lock;
+       int ret = 1;
+
+       /*
+        * recursive read locks succeed when current owns the rwsem,
+        * but not when read_depth == 0 which means that the rwsem is
+        * write locked.
+        */
+       if (rt_mutex_owner(lock) != current)
+               ret = rt_mutex_trylock(&rwsem->lock);
+       else if (!rwsem->read_depth)
+               ret = 0;
+
+       if (ret)
+               rwsem->read_depth++;
+       return ret;
+
+}
+
+int  rt_down_read_trylock(struct rw_semaphore *rwsem)
+{
+       int ret;
+
+       ret = rt__down_read_trylock(rwsem);
+       if (ret)
+               rwsem_acquire(&rwsem->dep_map, 0, 1, _RET_IP_);
+
+       return ret;
+}
+EXPORT_SYMBOL(rt_down_read_trylock);
+
+void rt__down_read(struct rw_semaphore *rwsem)
+{
+       struct rt_mutex *lock = &rwsem->lock;
+
+       if (rt_mutex_owner(lock) != current)
+               rt_mutex_lock(&rwsem->lock);
+       rwsem->read_depth++;
+}
+EXPORT_SYMBOL(rt__down_read);
+
+static void __rt_down_read(struct rw_semaphore *rwsem, int subclass)
+{
+       rwsem_acquire_read(&rwsem->dep_map, subclass, 0, _RET_IP_);
+       rt__down_read(rwsem);
+}
+
+void  rt_down_read(struct rw_semaphore *rwsem)
+{
+       __rt_down_read(rwsem, 0);
+}
+EXPORT_SYMBOL(rt_down_read);
+
+void  rt_down_read_nested(struct rw_semaphore *rwsem, int subclass)
+{
+       __rt_down_read(rwsem, subclass);
+}
+EXPORT_SYMBOL(rt_down_read_nested);
+
+void  __rt_rwsem_init(struct rw_semaphore *rwsem, const char *name,
+                             struct lock_class_key *key)
+{
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+       /*
+        * Make sure we are not reinitializing a held lock:
+        */
+       debug_check_no_locks_freed((void *)rwsem, sizeof(*rwsem));
+       lockdep_init_map(&rwsem->dep_map, name, key, 0);
+#endif
+       rwsem->read_depth = 0;
+       rwsem->lock.save_state = 0;
+}
+EXPORT_SYMBOL(__rt_rwsem_init);
+
+/**
+ * atomic_dec_and_mutex_lock - return holding mutex if we dec to 0
+ * @cnt: the atomic which we are to dec
+ * @lock: the mutex to return holding if we dec to 0
+ *
+ * return true and hold lock if we dec to 0, return false otherwise
+ */
+int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock)
+{
+       /* dec if we can't possibly hit 0 */
+       if (atomic_add_unless(cnt, -1, 1))
+               return 0;
+       /* we might hit 0, so take the lock */
+       mutex_lock(lock);
+       if (!atomic_dec_and_test(cnt)) {
+               /* when we actually did the dec, we didn't hit 0 */
+               mutex_unlock(lock);
+               return 0;
+       }
+       /* we hit 0, and we hold the lock */
+       return 1;
+}
+EXPORT_SYMBOL(atomic_dec_and_mutex_lock);
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index b066724d7a5b..bb42267257ad 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -7,6 +7,11 @@
  *  Copyright (C) 2005-2006 Timesys Corp., Thomas Gleixner <tglx@timesys.com>
  *  Copyright (C) 2005 Kihon Technologies Inc., Steven Rostedt
  *  Copyright (C) 2006 Esben Nielsen
+ *  Adaptive Spinlocks:
+ *  Copyright (C) 2008 Novell, Inc., Gregory Haskins, Sven Dietrich,
+ *                                  and Peter Morreale,
+ * Adaptive Spinlocks simplification:
+ *  Copyright (C) 2008 Red Hat, Inc., Steven Rostedt <srostedt@redhat.com>
  *
  *  See Documentation/locking/rt-mutex-design.txt for details.
  */
@@ -16,6 +21,8 @@
 #include <linux/sched/rt.h>
 #include <linux/sched/deadline.h>
 #include <linux/timer.h>
+#include <linux/ww_mutex.h>
+#include <linux/blkdev.h>
 
 #include "rtmutex_common.h"
 
@@ -133,6 +140,12 @@ static void fixup_rt_mutex_waiters(struct rt_mutex *lock)
                WRITE_ONCE(*p, owner & ~RT_MUTEX_HAS_WAITERS);
 }
 
+static int rt_mutex_real_waiter(struct rt_mutex_waiter *waiter)
+{
+       return waiter && waiter != PI_WAKEUP_INPROGRESS &&
+               waiter != PI_REQUEUE_INPROGRESS;
+}
+
 /*
  * We can speed up the acquire/release, if there's no debugging state to be
  * set up.
@@ -163,13 +176,14 @@ static inline void mark_rt_mutex_waiters(struct rt_mutex *lock)
  * 2) Drop lock->wait_lock
  * 3) Try to unlock the lock with cmpxchg
  */
-static inline bool unlock_rt_mutex_safe(struct rt_mutex *lock)
+static inline bool unlock_rt_mutex_safe(struct rt_mutex *lock,
+                                       unsigned long flags)
        __releases(lock->wait_lock)
 {
        struct task_struct *owner = rt_mutex_owner(lock);
 
        clear_rt_mutex_waiters(lock);
-       raw_spin_unlock(&lock->wait_lock);
+       raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
        /*
         * If a new waiter comes in between the unlock and the cmpxchg
         * we have two situations:
@@ -211,11 +225,12 @@ static inline void mark_rt_mutex_waiters(struct rt_mutex *lock)
 /*
  * Simple slow path only version: lock->owner is protected by lock->wait_lock.
  */
-static inline bool unlock_rt_mutex_safe(struct rt_mutex *lock)
+static inline bool unlock_rt_mutex_safe(struct rt_mutex *lock,
+                                       unsigned long flags)
        __releases(lock->wait_lock)
 {
        lock->owner = NULL;
-       raw_spin_unlock(&lock->wait_lock);
+       raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
        return true;
 }
 #endif
@@ -412,6 +427,14 @@ static bool rt_mutex_cond_detect_deadlock(struct rt_mutex_waiter *waiter,
        return debug_rt_mutex_detect_deadlock(waiter, chwalk);
 }
 
+static void rt_mutex_wake_waiter(struct rt_mutex_waiter *waiter)
+{
+       if (waiter->savestate)
+               wake_up_lock_sleeper(waiter->task);
+       else
+               wake_up_process(waiter->task);
+}
+
 /*
  * Max number of times we'll walk the boosting chain:
  */
@@ -419,7 +442,8 @@ int max_lock_depth = 1024;
 
 static inline struct rt_mutex *task_blocked_on_lock(struct task_struct *p)
 {
-       return p->pi_blocked_on ? p->pi_blocked_on->lock : NULL;
+       return rt_mutex_real_waiter(p->pi_blocked_on) ?
+               p->pi_blocked_on->lock : NULL;
 }
 
 /*
@@ -497,7 +521,6 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
        int ret = 0, depth = 0;
        struct rt_mutex *lock;
        bool detect_deadlock;
-       unsigned long flags;
        bool requeue = true;
 
        detect_deadlock = rt_mutex_cond_detect_deadlock(orig_waiter, chwalk);
@@ -540,7 +563,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
        /*
         * [1] Task cannot go away as we did a get_task() before !
         */
-       raw_spin_lock_irqsave(&task->pi_lock, flags);
+       raw_spin_lock_irq(&task->pi_lock);
 
        /*
         * [2] Get the waiter on which @task is blocked on.
@@ -556,7 +579,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
         * reached or the state of the chain has changed while we
         * dropped the locks.
         */
-       if (!waiter)
+       if (!rt_mutex_real_waiter(waiter))
                goto out_unlock_pi;
 
        /*
@@ -624,7 +647,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
         * operations.
         */
        if (!raw_spin_trylock(&lock->wait_lock)) {
-               raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+               raw_spin_unlock_irq(&task->pi_lock);
                cpu_relax();
                goto retry;
        }
@@ -655,7 +678,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
                /*
                 * No requeue[7] here. Just release @task [8]
                 */
-               raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+               raw_spin_unlock(&task->pi_lock);
                put_task_struct(task);
 
                /*
@@ -663,14 +686,14 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
                 * If there is no owner of the lock, end of chain.
                 */
                if (!rt_mutex_owner(lock)) {
-                       raw_spin_unlock(&lock->wait_lock);
+                       raw_spin_unlock_irq(&lock->wait_lock);
                        return 0;
                }
 
                /* [10] Grab the next task, i.e. owner of @lock */
                task = rt_mutex_owner(lock);
                get_task_struct(task);
-               raw_spin_lock_irqsave(&task->pi_lock, flags);
+               raw_spin_lock(&task->pi_lock);
 
                /*
                 * No requeue [11] here. We just do deadlock detection.
@@ -685,8 +708,8 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
                top_waiter = rt_mutex_top_waiter(lock);
 
                /* [13] Drop locks */
-               raw_spin_unlock_irqrestore(&task->pi_lock, flags);
-               raw_spin_unlock(&lock->wait_lock);
+               raw_spin_unlock(&task->pi_lock);
+               raw_spin_unlock_irq(&lock->wait_lock);
 
                /* If owner is not blocked, end of chain. */
                if (!next_lock)
@@ -707,7 +730,7 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
        rt_mutex_enqueue(lock, waiter);
 
        /* [8] Release the task */
-       raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+       raw_spin_unlock(&task->pi_lock);
        put_task_struct(task);
 
        /*
@@ -718,21 +741,24 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
         * follow here. This is the end of the chain we are walking.
         */
        if (!rt_mutex_owner(lock)) {
+               struct rt_mutex_waiter *lock_top_waiter;
+
                /*
                 * If the requeue [7] above changed the top waiter,
                 * then we need to wake the new top waiter up to try
                 * to get the lock.
                 */
-               if (prerequeue_top_waiter != rt_mutex_top_waiter(lock))
-                       wake_up_process(rt_mutex_top_waiter(lock)->task);
-               raw_spin_unlock(&lock->wait_lock);
+               lock_top_waiter = rt_mutex_top_waiter(lock);
+               if (prerequeue_top_waiter != lock_top_waiter)
+                       rt_mutex_wake_waiter(lock_top_waiter);
+               raw_spin_unlock_irq(&lock->wait_lock);
                return 0;
        }
 
        /* [10] Grab the next task, i.e. the owner of @lock */
        task = rt_mutex_owner(lock);
        get_task_struct(task);
-       raw_spin_lock_irqsave(&task->pi_lock, flags);
+       raw_spin_lock(&task->pi_lock);
 
        /* [11] requeue the pi waiters if necessary */
        if (waiter == rt_mutex_top_waiter(lock)) {
@@ -786,8 +812,8 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
        top_waiter = rt_mutex_top_waiter(lock);
 
        /* [13] Drop the locks */
-       raw_spin_unlock_irqrestore(&task->pi_lock, flags);
-       raw_spin_unlock(&lock->wait_lock);
+       raw_spin_unlock(&task->pi_lock);
+       raw_spin_unlock_irq(&lock->wait_lock);
 
        /*
         * Make the actual exit decisions [12], based on the stored
@@ -810,28 +836,46 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
        goto again;
 
  out_unlock_pi:
-       raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+       raw_spin_unlock_irq(&task->pi_lock);
  out_put_task:
        put_task_struct(task);
 
        return ret;
 }
 
+
+#define STEAL_NORMAL  0
+#define STEAL_LATERAL 1
+
+/*
+ * Note that RT tasks are excluded from lateral-steals to prevent the
+ * introduction of an unbounded latency
+ */
+static inline int lock_is_stealable(struct task_struct *task,
+                                   struct task_struct *pendowner, int mode)
+{
+    if (mode == STEAL_NORMAL || rt_task(task)) {
+           if (task->prio >= pendowner->prio)
+                   return 0;
+    } else if (task->prio > pendowner->prio)
+           return 0;
+    return 1;
+}
+
 /*
  * Try to take an rt-mutex
  *
- * Must be called with lock->wait_lock held.
+ * Must be called with lock->wait_lock held and interrupts disabled
  *
  * @lock:   The lock to be acquired.
  * @task:   The task which wants to acquire the lock
  * @waiter: The waiter that is queued to the lock's wait tree if the
  *         callsite called task_blocked_on_lock(), otherwise NULL
  */
-static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
-                               struct rt_mutex_waiter *waiter)
+static int __try_to_take_rt_mutex(struct rt_mutex *lock,
+                                 struct task_struct *task,
+                                 struct rt_mutex_waiter *waiter, int mode)
 {
-       unsigned long flags;
-
        /*
         * Before testing whether we can acquire @lock, we set the
         * RT_MUTEX_HAS_WAITERS bit in @lock->owner. This forces all
@@ -867,8 +911,10 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
                 * If waiter is not the highest priority waiter of
                 * @lock, give up.
                 */
-               if (waiter != rt_mutex_top_waiter(lock))
+               if (waiter != rt_mutex_top_waiter(lock)) {
+                       /* XXX lock_is_stealable() ? */
                        return 0;
+               }
 
                /*
                 * We can acquire the lock. Remove the waiter from the
@@ -886,14 +932,10 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
                 * not need to be dequeued.
                 */
                if (rt_mutex_has_waiters(lock)) {
-                       /*
-                        * If @task->prio is greater than or equal to
-                        * the top waiter priority (kernel view),
-                        * @task lost.
-                        */
-                       if (task->prio >= rt_mutex_top_waiter(lock)->prio)
-                               return 0;
+                       struct task_struct *pown = rt_mutex_top_waiter(lock)->task;
 
+                       if (task != pown && !lock_is_stealable(task, pown, mode))
+                               return 0;
                        /*
                         * The current top waiter stays enqueued. We
                         * don't have to change anything in the lock
@@ -916,7 +958,7 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
         * case, but conditionals are more expensive than a redundant
         * store.
         */
-       raw_spin_lock_irqsave(&task->pi_lock, flags);
+       raw_spin_lock(&task->pi_lock);
        task->pi_blocked_on = NULL;
        /*
         * Finish the lock acquisition. @task is the new owner. If
@@ -925,7 +967,7 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
         */
        if (rt_mutex_has_waiters(lock))
                rt_mutex_enqueue_pi(task, rt_mutex_top_waiter(lock));
-       raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+       raw_spin_unlock(&task->pi_lock);
 
 takeit:
        /* We got the lock. */
@@ -942,12 +984,444 @@ static int try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
        return 1;
 }
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+/*
+ * preemptible spin_lock functions:
+ */
+static inline void rt_spin_lock_fastlock(struct rt_mutex *lock,
+                                        void  (*slowfn)(struct rt_mutex *lock,
+                                                        bool mg_off),
+                                        bool do_mig_dis)
+{
+       might_sleep_no_state_check();
+
+       if (do_mig_dis)
+               migrate_disable();
+
+       if (likely(rt_mutex_cmpxchg_acquire(lock, NULL, current)))
+               rt_mutex_deadlock_account_lock(lock, current);
+       else
+               slowfn(lock, do_mig_dis);
+}
+
+static inline int rt_spin_lock_fastunlock(struct rt_mutex *lock,
+                                          int  (*slowfn)(struct rt_mutex *lock))
+{
+       if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) {
+               rt_mutex_deadlock_account_unlock(current);
+               return 0;
+       }
+       return slowfn(lock);
+}
+#ifdef CONFIG_SMP
+/*
+ * Note that owner is a speculative pointer and dereferencing relies
+ * on rcu_read_lock() and the check against the lock owner.
+ */
+static int adaptive_wait(struct rt_mutex *lock,
+                        struct task_struct *owner)
+{
+       int res = 0;
+
+       rcu_read_lock();
+       for (;;) {
+               if (owner != rt_mutex_owner(lock))
+                       break;
+               /*
+                * Ensure that owner->on_cpu is dereferenced _after_
+                * checking the above to be valid.
+                */
+               barrier();
+               if (!owner->on_cpu) {
+                       res = 1;
+                       break;
+               }
+               cpu_relax();
+       }
+       rcu_read_unlock();
+       return res;
+}
+#else
+static int adaptive_wait(struct rt_mutex *lock,
+                        struct task_struct *orig_owner)
+{
+       return 1;
+}
+#endif
+
+static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
+                                  struct rt_mutex_waiter *waiter,
+                                  struct task_struct *task,
+                                  enum rtmutex_chainwalk chwalk);
+/*
+ * Slow path lock function spin_lock style: this variant is very
+ * careful not to miss any non-lock wakeups.
+ *
+ * We store the current state under p->pi_lock in p->saved_state and
+ * the try_to_wake_up() code handles this accordingly.
+ */
+static void  noinline __sched rt_spin_lock_slowlock(struct rt_mutex *lock,
+                                                   bool mg_off)
+{
+       struct task_struct *lock_owner, *self = current;
+       struct rt_mutex_waiter waiter, *top_waiter;
+       unsigned long flags;
+       int ret;
+
+       rt_mutex_init_waiter(&waiter, true);
+
+       raw_spin_lock_irqsave(&lock->wait_lock, flags);
+
+       if (__try_to_take_rt_mutex(lock, self, NULL, STEAL_LATERAL)) {
+               raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+               return;
+       }
+
+       BUG_ON(rt_mutex_owner(lock) == self);
+
+       /*
+        * We save whatever state the task is in and we'll restore it
+        * after acquiring the lock taking real wakeups into account
+        * as well. We are serialized via pi_lock against wakeups. See
+        * try_to_wake_up().
+        */
+       raw_spin_lock(&self->pi_lock);
+       self->saved_state = self->state;
+       __set_current_state_no_track(TASK_UNINTERRUPTIBLE);
+       raw_spin_unlock(&self->pi_lock);
+
+       ret = task_blocks_on_rt_mutex(lock, &waiter, self, RT_MUTEX_MIN_CHAINWALK);
+       BUG_ON(ret);
+
+       for (;;) {
+               /* Try to acquire the lock again. */
+               if (__try_to_take_rt_mutex(lock, self, &waiter, STEAL_LATERAL))
+                       break;
+
+               top_waiter = rt_mutex_top_waiter(lock);
+               lock_owner = rt_mutex_owner(lock);
+
+               raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+
+               debug_rt_mutex_print_deadlock(&waiter);
+
+               if (top_waiter != &waiter || adaptive_wait(lock, lock_owner)) {
+                       if (mg_off)
+                               migrate_enable();
+                       schedule();
+                       if (mg_off)
+                               migrate_disable();
+               }
+
+               raw_spin_lock_irqsave(&lock->wait_lock, flags);
+
+               raw_spin_lock(&self->pi_lock);
+               __set_current_state_no_track(TASK_UNINTERRUPTIBLE);
+               raw_spin_unlock(&self->pi_lock);
+       }
+
+       /*
+        * Restore the task state to current->saved_state. We set it
+        * to the original state above and the try_to_wake_up() code
+        * has possibly updated it when a real (non-rtmutex) wakeup
+        * happened while we were blocked. Clear saved_state so
+        * try_to_wakeup() does not get confused.
+        */
+       raw_spin_lock(&self->pi_lock);
+       __set_current_state_no_track(self->saved_state);
+       self->saved_state = TASK_RUNNING;
+       raw_spin_unlock(&self->pi_lock);
+
+       /*
+        * try_to_take_rt_mutex() sets the waiter bit
+        * unconditionally. We might have to fix that up:
+        */
+       fixup_rt_mutex_waiters(lock);
+
+       BUG_ON(rt_mutex_has_waiters(lock) && &waiter == rt_mutex_top_waiter(lock));
+       BUG_ON(!RB_EMPTY_NODE(&waiter.tree_entry));
+
+       raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+
+       debug_rt_mutex_free_waiter(&waiter);
+}
+
+static void mark_wakeup_next_waiter(struct wake_q_head *wake_q,
+                                   struct wake_q_head *wake_sleeper_q,
+                                   struct rt_mutex *lock);
+/*
+ * Slow path to release a rt_mutex spin_lock style
+ */
+static int noinline __sched rt_spin_lock_slowunlock(struct rt_mutex *lock)
+{
+       unsigned long flags;
+       WAKE_Q(wake_q);
+       WAKE_Q(wake_sleeper_q);
+
+       raw_spin_lock_irqsave(&lock->wait_lock, flags);
+
+       debug_rt_mutex_unlock(lock);
+
+       rt_mutex_deadlock_account_unlock(current);
+
+       if (!rt_mutex_has_waiters(lock)) {
+               lock->owner = NULL;
+               raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+               return 0;
+       }
+
+       mark_wakeup_next_waiter(&wake_q, &wake_sleeper_q, lock);
+
+       raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+       wake_up_q(&wake_q);
+       wake_up_q_sleeper(&wake_sleeper_q);
+
+       /* Undo pi boosting.when necessary */
+       rt_mutex_adjust_prio(current);
+       return 0;
+}
+
+static int noinline __sched rt_spin_lock_slowunlock_no_deboost(struct rt_mutex *lock)
+{
+       unsigned long flags;
+       WAKE_Q(wake_q);
+       WAKE_Q(wake_sleeper_q);
+
+       raw_spin_lock_irqsave(&lock->wait_lock, flags);
+
+       debug_rt_mutex_unlock(lock);
+
+       rt_mutex_deadlock_account_unlock(current);
+
+       if (!rt_mutex_has_waiters(lock)) {
+               lock->owner = NULL;
+               raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+               return 0;
+       }
+
+       mark_wakeup_next_waiter(&wake_q, &wake_sleeper_q, lock);
+
+       raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
+       wake_up_q(&wake_q);
+       wake_up_q_sleeper(&wake_sleeper_q);
+       return 1;
+}
+
+void __lockfunc rt_spin_lock__no_mg(spinlock_t *lock)
+{
+       rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock, false);
+       spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
+}
+EXPORT_SYMBOL(rt_spin_lock__no_mg);
+
+void __lockfunc rt_spin_lock(spinlock_t *lock)
+{
+       rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock, true);
+       spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);
+}
+EXPORT_SYMBOL(rt_spin_lock);
+
+void __lockfunc __rt_spin_lock(struct rt_mutex *lock)
+{
+       rt_spin_lock_fastlock(lock, rt_spin_lock_slowlock, true);
+}
+EXPORT_SYMBOL(__rt_spin_lock);
+
+void __lockfunc __rt_spin_lock__no_mg(struct rt_mutex *lock)
+{
+       rt_spin_lock_fastlock(lock, rt_spin_lock_slowlock, false);
+}
+EXPORT_SYMBOL(__rt_spin_lock__no_mg);
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+void __lockfunc rt_spin_lock_nested(spinlock_t *lock, int subclass)
+{
+       spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
+       rt_spin_lock_fastlock(&lock->lock, rt_spin_lock_slowlock, true);
+}
+EXPORT_SYMBOL(rt_spin_lock_nested);
+#endif
+
+void __lockfunc rt_spin_unlock__no_mg(spinlock_t *lock)
+{
+       /* NOTE: we always pass in '1' for nested, for simplicity */
+       spin_release(&lock->dep_map, 1, _RET_IP_);
+       rt_spin_lock_fastunlock(&lock->lock, rt_spin_lock_slowunlock);
+}
+EXPORT_SYMBOL(rt_spin_unlock__no_mg);
+
+void __lockfunc rt_spin_unlock(spinlock_t *lock)
+{
+       /* NOTE: we always pass in '1' for nested, for simplicity */
+       spin_release(&lock->dep_map, 1, _RET_IP_);
+       rt_spin_lock_fastunlock(&lock->lock, rt_spin_lock_slowunlock);
+       migrate_enable();
+}
+EXPORT_SYMBOL(rt_spin_unlock);
+
+int __lockfunc rt_spin_unlock_no_deboost(spinlock_t *lock)
+{
+       int ret;
+
+       /* NOTE: we always pass in '1' for nested, for simplicity */
+       spin_release(&lock->dep_map, 1, _RET_IP_);
+       ret = rt_spin_lock_fastunlock(&lock->lock, rt_spin_lock_slowunlock_no_deboost);
+       migrate_enable();
+       return ret;
+}
+
+void __lockfunc __rt_spin_unlock(struct rt_mutex *lock)
+{
+       rt_spin_lock_fastunlock(lock, rt_spin_lock_slowunlock);
+}
+EXPORT_SYMBOL(__rt_spin_unlock);
+
+/*
+ * Wait for the lock to get unlocked: instead of polling for an unlock
+ * (like raw spinlocks do), we lock and unlock, to force the kernel to
+ * schedule if there's contention:
+ */
+void __lockfunc rt_spin_unlock_wait(spinlock_t *lock)
+{
+       spin_lock(lock);
+       spin_unlock(lock);
+}
+EXPORT_SYMBOL(rt_spin_unlock_wait);
+
+int __lockfunc __rt_spin_trylock(struct rt_mutex *lock)
+{
+       return rt_mutex_trylock(lock);
+}
+
+int __lockfunc rt_spin_trylock__no_mg(spinlock_t *lock)
+{
+       int ret;
+
+       ret = rt_mutex_trylock(&lock->lock);
+       if (ret)
+               spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
+       return ret;
+}
+EXPORT_SYMBOL(rt_spin_trylock__no_mg);
+
+int __lockfunc rt_spin_trylock(spinlock_t *lock)
+{
+       int ret;
+
+       migrate_disable();
+       ret = rt_mutex_trylock(&lock->lock);
+       if (ret)
+               spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
+       else
+               migrate_enable();
+       return ret;
+}
+EXPORT_SYMBOL(rt_spin_trylock);
+
+int __lockfunc rt_spin_trylock_bh(spinlock_t *lock)
+{
+       int ret;
+
+       local_bh_disable();
+       ret = rt_mutex_trylock(&lock->lock);
+       if (ret) {
+               migrate_disable();
+               spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
+       } else
+               local_bh_enable();
+       return ret;
+}
+EXPORT_SYMBOL(rt_spin_trylock_bh);
+
+int __lockfunc rt_spin_trylock_irqsave(spinlock_t *lock, unsigned long *flags)
+{
+       int ret;
+
+       *flags = 0;
+       ret = rt_mutex_trylock(&lock->lock);
+       if (ret) {
+               migrate_disable();
+               spin_acquire(&lock->dep_map, 0, 1, _RET_IP_);
+       }
+       return ret;
+}
+EXPORT_SYMBOL(rt_spin_trylock_irqsave);
+
+int atomic_dec_and_spin_lock(atomic_t *atomic, spinlock_t *lock)
+{
+       /* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */
+       if (atomic_add_unless(atomic, -1, 1))
+               return 0;
+       rt_spin_lock(lock);
+       if (atomic_dec_and_test(atomic))
+               return 1;
+       rt_spin_unlock(lock);
+       return 0;
+}
+EXPORT_SYMBOL(atomic_dec_and_spin_lock);
+
+       void
+__rt_spin_lock_init(spinlock_t *lock, char *name, struct lock_class_key *key)
+{
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+       /*
+        * Make sure we are not reinitializing a held lock:
+        */
+       debug_check_no_locks_freed((void *)lock, sizeof(*lock));
+       lockdep_init_map(&lock->dep_map, name, key, 0);
+#endif
+}
+EXPORT_SYMBOL(__rt_spin_lock_init);
+
+#endif /* PREEMPT_RT_FULL */
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+       static inline int __sched
+__mutex_lock_check_stamp(struct rt_mutex *lock, struct ww_acquire_ctx *ctx)
+{
+       struct ww_mutex *ww = container_of(lock, struct ww_mutex, base.lock);
+       struct ww_acquire_ctx *hold_ctx = ACCESS_ONCE(ww->ctx);
+
+       if (!hold_ctx)
+               return 0;
+
+       if (unlikely(ctx == hold_ctx))
+               return -EALREADY;
+
+       if (ctx->stamp - hold_ctx->stamp <= LONG_MAX &&
+           (ctx->stamp != hold_ctx->stamp || ctx > hold_ctx)) {
+#ifdef CONFIG_DEBUG_MUTEXES
+               DEBUG_LOCKS_WARN_ON(ctx->contending_lock);
+               ctx->contending_lock = ww;
+#endif
+               return -EDEADLK;
+       }
+
+       return 0;
+}
+#else
+       static inline int __sched
+__mutex_lock_check_stamp(struct rt_mutex *lock, struct ww_acquire_ctx *ctx)
+{
+       BUG();
+       return 0;
+}
+
+#endif
+
+static inline int
+try_to_take_rt_mutex(struct rt_mutex *lock, struct task_struct *task,
+                    struct rt_mutex_waiter *waiter)
+{
+       return __try_to_take_rt_mutex(lock, task, waiter, STEAL_NORMAL);
+}
+
 /*
  * Task blocks on lock.
  *
  * Prepare waiter and propagate pi chain
  *
- * This must be called with lock->wait_lock held.
+ * This must be called with lock->wait_lock held and interrupts disabled
  */
 static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
                                   struct rt_mutex_waiter *waiter,
@@ -958,7 +1432,6 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
        struct rt_mutex_waiter *top_waiter = waiter;
        struct rt_mutex *next_lock;
        int chain_walk = 0, res;
-       unsigned long flags;
 
        /*
         * Early deadlock detection. We really don't want the task to
@@ -972,7 +1445,24 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
        if (owner == task)
                return -EDEADLK;
 
-       raw_spin_lock_irqsave(&task->pi_lock, flags);
+       raw_spin_lock(&task->pi_lock);
+
+       /*
+        * In the case of futex requeue PI, this will be a proxy
+        * lock. The task will wake unaware that it is enqueueed on
+        * this lock. Avoid blocking on two locks and corrupting
+        * pi_blocked_on via the PI_WAKEUP_INPROGRESS
+        * flag. futex_wait_requeue_pi() sets this when it wakes up
+        * before requeue (due to a signal or timeout). Do not enqueue
+        * the task if PI_WAKEUP_INPROGRESS is set.
+        */
+       if (task != current && task->pi_blocked_on == PI_WAKEUP_INPROGRESS) {
+               raw_spin_unlock(&task->pi_lock);
+               return -EAGAIN;
+       }
+
+       BUG_ON(rt_mutex_real_waiter(task->pi_blocked_on));
+
        __rt_mutex_adjust_prio(task);
        waiter->task = task;
        waiter->lock = lock;
@@ -985,18 +1475,18 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
 
        task->pi_blocked_on = waiter;
 
-       raw_spin_unlock_irqrestore(&task->pi_lock, flags);
+       raw_spin_unlock(&task->pi_lock);
 
        if (!owner)
                return 0;
 
-       raw_spin_lock_irqsave(&owner->pi_lock, flags);
+       raw_spin_lock(&owner->pi_lock);
        if (waiter == rt_mutex_top_waiter(lock)) {
                rt_mutex_dequeue_pi(owner, top_waiter);
                rt_mutex_enqueue_pi(owner, waiter);
 
                __rt_mutex_adjust_prio(owner);
-               if (owner->pi_blocked_on)
+               if (rt_mutex_real_waiter(owner->pi_blocked_on))
                        chain_walk = 1;
        } else if (rt_mutex_cond_detect_deadlock(waiter, chwalk)) {
                chain_walk = 1;
@@ -1005,7 +1495,7 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
        /* Store the lock on which owner is blocked or NULL */
        next_lock = task_blocked_on_lock(owner);
 
-       raw_spin_unlock_irqrestore(&owner->pi_lock, flags);
+       raw_spin_unlock(&owner->pi_lock);
        /*
         * Even if full deadlock detection is on, if the owner is not
         * blocked itself, we can avoid finding this out in the chain
@@ -1021,12 +1511,12 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
         */
        get_task_struct(owner);
 
-       raw_spin_unlock(&lock->wait_lock);
+       raw_spin_unlock_irq(&lock->wait_lock);
 
        res = rt_mutex_adjust_prio_chain(owner, chwalk, lock,
                                         next_lock, waiter, task);
 
-       raw_spin_lock(&lock->wait_lock);
+       raw_spin_lock_irq(&lock->wait_lock);
 
        return res;
 }
@@ -1035,15 +1525,15 @@ static int task_blocks_on_rt_mutex(struct rt_mutex *lock,
  * Remove the top waiter from the current tasks pi waiter tree and
  * queue it up.
  *
- * Called with lock->wait_lock held.
+ * Called with lock->wait_lock held and interrupts disabled.
  */
 static void mark_wakeup_next_waiter(struct wake_q_head *wake_q,
+                                   struct wake_q_head *wake_sleeper_q,
                                    struct rt_mutex *lock)
 {
        struct rt_mutex_waiter *waiter;
-       unsigned long flags;
 
-       raw_spin_lock_irqsave(&current->pi_lock, flags);
+       raw_spin_lock(&current->pi_lock);
 
        waiter = rt_mutex_top_waiter(lock);
 
@@ -1065,15 +1555,18 @@ static void mark_wakeup_next_waiter(struct wake_q_head *wake_q,
         */
        lock->owner = (void *) RT_MUTEX_HAS_WAITERS;
 
-       raw_spin_unlock_irqrestore(&current->pi_lock, flags);
+       raw_spin_unlock(&current->pi_lock);
 
-       wake_q_add(wake_q, waiter->task);
+       if (waiter->savestate)
+               wake_q_add_sleeper(wake_sleeper_q, waiter->task);
+       else
+               wake_q_add(wake_q, waiter->task);
 }
 
 /*
  * Remove a waiter from a lock and give up
  *
- * Must be called with lock->wait_lock held and
+ * Must be called with lock->wait_lock held and interrupts disabled. I must
  * have just failed to try_to_take_rt_mutex().
  */
 static void remove_waiter(struct rt_mutex *lock,
@@ -1081,13 +1574,12 @@ static void remove_waiter(struct rt_mutex *lock,
 {
        bool is_top_waiter = (waiter == rt_mutex_top_waiter(lock));
        struct task_struct *owner = rt_mutex_owner(lock);
-       struct rt_mutex *next_lock;
-       unsigned long flags;
+       struct rt_mutex *next_lock = NULL;
 
-       raw_spin_lock_irqsave(&current->pi_lock, flags);
+       raw_spin_lock(&current->pi_lock);
        rt_mutex_dequeue(lock, waiter);
        current->pi_blocked_on = NULL;
-       raw_spin_unlock_irqrestore(&current->pi_lock, flags);
+       raw_spin_unlock(&current->pi_lock);
 
        /*
         * Only update priority if the waiter was the highest priority
@@ -1096,7 +1588,7 @@ static void remove_waiter(struct rt_mutex *lock,
        if (!owner || !is_top_waiter)
                return;
 
-       raw_spin_lock_irqsave(&owner->pi_lock, flags);
+       raw_spin_lock(&owner->pi_lock);
 
        rt_mutex_dequeue_pi(owner, waiter);
 
@@ -1106,9 +1598,10 @@ static void remove_waiter(struct rt_mutex *lock,
        __rt_mutex_adjust_prio(owner);
 
        /* Store the lock on which owner is blocked or NULL */
-       next_lock = task_blocked_on_lock(owner);
+       if (rt_mutex_real_waiter(owner->pi_blocked_on))
+               next_lock = task_blocked_on_lock(owner);
 
-       raw_spin_unlock_irqrestore(&owner->pi_lock, flags);
+       raw_spin_unlock(&owner->pi_lock);
 
        /*
         * Don't walk the chain, if the owner task is not blocked
@@ -1120,12 +1613,12 @@ static void remove_waiter(struct rt_mutex *lock,
        /* gets dropped in rt_mutex_adjust_prio_chain()! */
        get_task_struct(owner);
 
-       raw_spin_unlock(&lock->wait_lock);
+       raw_spin_unlock_irq(&lock->wait_lock);
 
        rt_mutex_adjust_prio_chain(owner, RT_MUTEX_MIN_CHAINWALK, lock,
                                   next_lock, NULL, current);
 
-       raw_spin_lock(&lock->wait_lock);
+       raw_spin_lock_irq(&lock->wait_lock);
 }
 
 /*
@@ -1142,17 +1635,17 @@ void rt_mutex_adjust_pi(struct task_struct *task)
        raw_spin_lock_irqsave(&task->pi_lock, flags);
 
        waiter = task->pi_blocked_on;
-       if (!waiter || (waiter->prio == task->prio &&
+       if (!rt_mutex_real_waiter(waiter) || (waiter->prio == task->prio &&
                        !dl_prio(task->prio))) {
                raw_spin_unlock_irqrestore(&task->pi_lock, flags);
                return;
        }
        next_lock = waiter->lock;
-       raw_spin_unlock_irqrestore(&task->pi_lock, flags);
 
        /* gets dropped in rt_mutex_adjust_prio_chain()! */
        get_task_struct(task);
 
+       raw_spin_unlock_irqrestore(&task->pi_lock, flags);
        rt_mutex_adjust_prio_chain(task, RT_MUTEX_MIN_CHAINWALK, NULL,
                                   next_lock, NULL, task);
 }
@@ -1161,16 +1654,17 @@ void rt_mutex_adjust_pi(struct task_struct *task)
  * __rt_mutex_slowlock() - Perform the wait-wake-try-to-take loop
  * @lock:               the rt_mutex to take
  * @state:              the state the task should block in (TASK_INTERRUPTIBLE
- *                      or TASK_UNINTERRUPTIBLE)
+ *                      or TASK_UNINTERRUPTIBLE)
  * @timeout:            the pre-initialized and started timer, or NULL for none
  * @waiter:             the pre-initialized rt_mutex_waiter
  *
- * lock->wait_lock must be held by the caller.
+ * Must be called with lock->wait_lock held and interrupts disabled
  */
 static int __sched
 __rt_mutex_slowlock(struct rt_mutex *lock, int state,
                    struct hrtimer_sleeper *timeout,
-                   struct rt_mutex_waiter *waiter)
+                   struct rt_mutex_waiter *waiter,
+                   struct ww_acquire_ctx *ww_ctx)
 {
        int ret = 0;
 
@@ -1179,27 +1673,28 @@ __rt_mutex_slowlock(struct rt_mutex *lock, int state,
                if (try_to_take_rt_mutex(lock, current, waiter))
                        break;
 
-               /*
-                * TASK_INTERRUPTIBLE checks for signals and
-                * timeout. Ignored otherwise.
-                */
-               if (unlikely(state == TASK_INTERRUPTIBLE)) {
-                       /* Signal pending? */
-                       if (signal_pending(current))
-                               ret = -EINTR;
-                       if (timeout && !timeout->task)
-                               ret = -ETIMEDOUT;
+               if (timeout && !timeout->task) {
+                       ret = -ETIMEDOUT;
+                       break;
+               }
+               if (signal_pending_state(state, current)) {
+                       ret = -EINTR;
+                       break;
+               }
+
+               if (ww_ctx && ww_ctx->acquired > 0) {
+                       ret = __mutex_lock_check_stamp(lock, ww_ctx);
                        if (ret)
                                break;
                }
 
-               raw_spin_unlock(&lock->wait_lock);
+               raw_spin_unlock_irq(&lock->wait_lock);
 
                debug_rt_mutex_print_deadlock(waiter);
 
                schedule();
 
-               raw_spin_lock(&lock->wait_lock);
+               raw_spin_lock_irq(&lock->wait_lock);
                set_current_state(state);
        }
 
@@ -1227,26 +1722,112 @@ static void rt_mutex_handle_deadlock(int res, int detect_deadlock,
        }
 }
 
+static __always_inline void ww_mutex_lock_acquired(struct ww_mutex *ww,
+                                                  struct ww_acquire_ctx *ww_ctx)
+{
+#ifdef CONFIG_DEBUG_MUTEXES
+       /*
+        * If this WARN_ON triggers, you used ww_mutex_lock to acquire,
+        * but released with a normal mutex_unlock in this call.
+        *
+        * This should never happen, always use ww_mutex_unlock.
+        */
+       DEBUG_LOCKS_WARN_ON(ww->ctx);
+
+       /*
+        * Not quite done after calling ww_acquire_done() ?
+        */
+       DEBUG_LOCKS_WARN_ON(ww_ctx->done_acquire);
+
+       if (ww_ctx->contending_lock) {
+               /*
+                * After -EDEADLK you tried to
+                * acquire a different ww_mutex? Bad!
+                */
+               DEBUG_LOCKS_WARN_ON(ww_ctx->contending_lock != ww);
+
+               /*
+                * You called ww_mutex_lock after receiving -EDEADLK,
+                * but 'forgot' to unlock everything else first?
+                */
+               DEBUG_LOCKS_WARN_ON(ww_ctx->acquired > 0);
+               ww_ctx->contending_lock = NULL;
+       }
+
+       /*
+        * Naughty, using a different class will lead to undefined behavior!
+        */
+       DEBUG_LOCKS_WARN_ON(ww_ctx->ww_class != ww->ww_class);
+#endif
+       ww_ctx->acquired++;
+}
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+static void ww_mutex_account_lock(struct rt_mutex *lock,
+                                 struct ww_acquire_ctx *ww_ctx)
+{
+       struct ww_mutex *ww = container_of(lock, struct ww_mutex, base.lock);
+       struct rt_mutex_waiter *waiter, *n;
+
+       /*
+        * This branch gets optimized out for the common case,
+        * and is only important for ww_mutex_lock.
+        */
+       ww_mutex_lock_acquired(ww, ww_ctx);
+       ww->ctx = ww_ctx;
+
+       /*
+        * Give any possible sleeping processes the chance to wake up,
+        * so they can recheck if they have to back off.
+        */
+       rbtree_postorder_for_each_entry_safe(waiter, n, &lock->waiters,
+                                            tree_entry) {
+               /* XXX debug rt mutex waiter wakeup */
+
+               BUG_ON(waiter->lock != lock);
+               rt_mutex_wake_waiter(waiter);
+       }
+}
+
+#else
+
+static void ww_mutex_account_lock(struct rt_mutex *lock,
+                                 struct ww_acquire_ctx *ww_ctx)
+{
+       BUG();
+}
+#endif
+
 /*
  * Slow path lock function:
  */
 static int __sched
 rt_mutex_slowlock(struct rt_mutex *lock, int state,
                  struct hrtimer_sleeper *timeout,
-                 enum rtmutex_chainwalk chwalk)
+                 enum rtmutex_chainwalk chwalk,
+                 struct ww_acquire_ctx *ww_ctx)
 {
        struct rt_mutex_waiter waiter;
+       unsigned long flags;
        int ret = 0;
 
-       debug_rt_mutex_init_waiter(&waiter);
-       RB_CLEAR_NODE(&waiter.pi_tree_entry);
-       RB_CLEAR_NODE(&waiter.tree_entry);
+       rt_mutex_init_waiter(&waiter, false);
 
-       raw_spin_lock(&lock->wait_lock);
+       /*
+        * Technically we could use raw_spin_[un]lock_irq() here, but this can
+        * be called in early boot if the cmpxchg() fast path is disabled
+        * (debug, no architecture support). In this case we will acquire the
+        * rtmutex with lock->wait_lock held. But we cannot unconditionally
+        * enable interrupts in that early boot case. So we need to use the
+        * irqsave/restore variants.
+        */
+       raw_spin_lock_irqsave(&lock->wait_lock, flags);
 
        /* Try to acquire the lock again: */
        if (try_to_take_rt_mutex(lock, current, NULL)) {
-               raw_spin_unlock(&lock->wait_lock);
+               if (ww_ctx)
+                       ww_mutex_account_lock(lock, ww_ctx);
+               raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
                return 0;
        }
 
@@ -1260,13 +1841,23 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
 
        if (likely(!ret))
                /* sleep on the mutex */
-               ret = __rt_mutex_slowlock(lock, state, timeout, &waiter);
+               ret = __rt_mutex_slowlock(lock, state, timeout, &waiter,
+                                         ww_ctx);
+       else if (ww_ctx) {
+               /* ww_mutex received EDEADLK, let it become EALREADY */
+               ret = __mutex_lock_check_stamp(lock, ww_ctx);
+               BUG_ON(!ret);
+       }
 
        if (unlikely(ret)) {
                __set_current_state(TASK_RUNNING);
                if (rt_mutex_has_waiters(lock))
                        remove_waiter(lock, &waiter);
-               rt_mutex_handle_deadlock(ret, chwalk, &waiter);
+               /* ww_mutex want to report EDEADLK/EALREADY, let them */
+               if (!ww_ctx)
+                       rt_mutex_handle_deadlock(ret, chwalk, &waiter);
+       } else if (ww_ctx) {
+               ww_mutex_account_lock(lock, ww_ctx);
        }
 
        /*
@@ -1275,7 +1866,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
         */
        fixup_rt_mutex_waiters(lock);
 
-       raw_spin_unlock(&lock->wait_lock);
+       raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
 
        /* Remove pending timer: */
        if (unlikely(timeout))
@@ -1291,6 +1882,7 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
  */
 static inline int rt_mutex_slowtrylock(struct rt_mutex *lock)
 {
+       unsigned long flags;
        int ret;
 
        /*
@@ -1302,10 +1894,10 @@ static inline int rt_mutex_slowtrylock(struct rt_mutex *lock)
                return 0;
 
        /*
-        * The mutex has currently no owner. Lock the wait lock and
-        * try to acquire the lock.
+        * The mutex has currently no owner. Lock the wait lock and try to
+        * acquire the lock. We use irqsave here to support early boot calls.
         */
-       raw_spin_lock(&lock->wait_lock);
+       raw_spin_lock_irqsave(&lock->wait_lock, flags);
 
        ret = try_to_take_rt_mutex(lock, current, NULL);
 
@@ -1315,7 +1907,7 @@ static inline int rt_mutex_slowtrylock(struct rt_mutex *lock)
         */
        fixup_rt_mutex_waiters(lock);
 
-       raw_spin_unlock(&lock->wait_lock);
+       raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
 
        return ret;
 }
@@ -1325,9 +1917,13 @@ static inline int rt_mutex_slowtrylock(struct rt_mutex *lock)
  * Return whether the current task needs to undo a potential priority boosting.
  */
 static bool __sched rt_mutex_slowunlock(struct rt_mutex *lock,
-                                       struct wake_q_head *wake_q)
+                                       struct wake_q_head *wake_q,
+                                       struct wake_q_head *wake_sleeper_q)
 {
-       raw_spin_lock(&lock->wait_lock);
+       unsigned long flags;
+
+       /* irqsave required to support early boot calls */
+       raw_spin_lock_irqsave(&lock->wait_lock, flags);
 
        debug_rt_mutex_unlock(lock);
 
@@ -1366,10 +1962,10 @@ static bool __sched rt_mutex_slowunlock(struct rt_mutex *lock,
         */
        while (!rt_mutex_has_waiters(lock)) {
                /* Drops lock->wait_lock ! */
-               if (unlock_rt_mutex_safe(lock) == true)
+               if (unlock_rt_mutex_safe(lock, flags) == true)
                        return false;
                /* Relock the rtmutex and try again */
-               raw_spin_lock(&lock->wait_lock);
+               raw_spin_lock_irqsave(&lock->wait_lock, flags);
        }
 
        /*
@@ -1378,9 +1974,9 @@ static bool __sched rt_mutex_slowunlock(struct rt_mutex *lock,
         *
         * Queue the next waiter for wakeup once we release the wait_lock.
         */
-       mark_wakeup_next_waiter(wake_q, lock);
+       mark_wakeup_next_waiter(wake_q, wake_sleeper_q, lock);
 
-       raw_spin_unlock(&lock->wait_lock);
+       raw_spin_unlock_irqrestore(&lock->wait_lock, flags);
 
        /* check PI boosting */
        return true;
@@ -1394,31 +1990,50 @@ static bool __sched rt_mutex_slowunlock(struct rt_mutex *lock,
  */
 static inline int
 rt_mutex_fastlock(struct rt_mutex *lock, int state,
+                 struct ww_acquire_ctx *ww_ctx,
                  int (*slowfn)(struct rt_mutex *lock, int state,
                                struct hrtimer_sleeper *timeout,
-                               enum rtmutex_chainwalk chwalk))
+                               enum rtmutex_chainwalk chwalk,
+                               struct ww_acquire_ctx *ww_ctx))
 {
        if (likely(rt_mutex_cmpxchg_acquire(lock, NULL, current))) {
                rt_mutex_deadlock_account_lock(lock, current);
                return 0;
-       } else
-               return slowfn(lock, state, NULL, RT_MUTEX_MIN_CHAINWALK);
+       }
+
+       /*
+        * If rt_mutex blocks, the function sched_submit_work will not call
+        * blk_schedule_flush_plug (because tsk_is_pi_blocked would be true).
+        * We must call blk_schedule_flush_plug here, if we don't call it,
+        * a deadlock in device mapper may happen.
+        */
+       if (unlikely(blk_needs_flush_plug(current)))
+               blk_schedule_flush_plug(current);
+
+       return slowfn(lock, state, NULL, RT_MUTEX_MIN_CHAINWALK,
+                     ww_ctx);
 }
 
 static inline int
 rt_mutex_timed_fastlock(struct rt_mutex *lock, int state,
                        struct hrtimer_sleeper *timeout,
                        enum rtmutex_chainwalk chwalk,
+                       struct ww_acquire_ctx *ww_ctx,
                        int (*slowfn)(struct rt_mutex *lock, int state,
                                      struct hrtimer_sleeper *timeout,
-                                     enum rtmutex_chainwalk chwalk))
+                                     enum rtmutex_chainwalk chwalk,
+                                     struct ww_acquire_ctx *ww_ctx))
 {
        if (chwalk == RT_MUTEX_MIN_CHAINWALK &&
            likely(rt_mutex_cmpxchg_acquire(lock, NULL, current))) {
                rt_mutex_deadlock_account_lock(lock, current);
                return 0;
-       } else
-               return slowfn(lock, state, timeout, chwalk);
+       }
+
+       if (unlikely(blk_needs_flush_plug(current)))
+               blk_schedule_flush_plug(current);
+
+       return slowfn(lock, state, timeout, chwalk, ww_ctx);
 }
 
 static inline int
@@ -1435,17 +2050,20 @@ rt_mutex_fasttrylock(struct rt_mutex *lock,
 static inline void
 rt_mutex_fastunlock(struct rt_mutex *lock,
                    bool (*slowfn)(struct rt_mutex *lock,
-                                  struct wake_q_head *wqh))
+                                  struct wake_q_head *wqh,
+                                  struct wake_q_head *wq_sleeper))
 {
        WAKE_Q(wake_q);
+       WAKE_Q(wake_sleeper_q);
 
        if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) {
                rt_mutex_deadlock_account_unlock(current);
 
        } else {
-               bool deboost = slowfn(lock, &wake_q);
+               bool deboost = slowfn(lock, &wake_q, &wake_sleeper_q);
 
                wake_up_q(&wake_q);
+               wake_up_q_sleeper(&wake_sleeper_q);
 
                /* Undo pi boosting if necessary: */
                if (deboost)
@@ -1462,7 +2080,7 @@ void __sched rt_mutex_lock(struct rt_mutex *lock)
 {
        might_sleep();
 
-       rt_mutex_fastlock(lock, TASK_UNINTERRUPTIBLE, rt_mutex_slowlock);
+       rt_mutex_fastlock(lock, TASK_UNINTERRUPTIBLE, NULL, rt_mutex_slowlock);
 }
 EXPORT_SYMBOL_GPL(rt_mutex_lock);
 
@@ -1479,7 +2097,7 @@ int __sched rt_mutex_lock_interruptible(struct rt_mutex *lock)
 {
        might_sleep();
 
-       return rt_mutex_fastlock(lock, TASK_INTERRUPTIBLE, rt_mutex_slowlock);
+       return rt_mutex_fastlock(lock, TASK_INTERRUPTIBLE, NULL, rt_mutex_slowlock);
 }
 EXPORT_SYMBOL_GPL(rt_mutex_lock_interruptible);
 
@@ -1492,10 +2110,29 @@ int rt_mutex_timed_futex_lock(struct rt_mutex *lock,
        might_sleep();
 
        return rt_mutex_timed_fastlock(lock, TASK_INTERRUPTIBLE, timeout,
-                                      RT_MUTEX_FULL_CHAINWALK,
+                                      RT_MUTEX_FULL_CHAINWALK, NULL,
                                       rt_mutex_slowlock);
 }
 
+/**
+ * rt_mutex_lock_killable - lock a rt_mutex killable
+ *
+ * @lock:              the rt_mutex to be locked
+ * @detect_deadlock:   deadlock detection on/off
+ *
+ * Returns:
+ *  0          on success
+ * -EINTR      when interrupted by a signal
+ * -EDEADLK    when the lock would deadlock (when deadlock detection is on)
+ */
+int __sched rt_mutex_lock_killable(struct rt_mutex *lock)
+{
+       might_sleep();
+
+       return rt_mutex_fastlock(lock, TASK_KILLABLE, NULL, rt_mutex_slowlock);
+}
+EXPORT_SYMBOL_GPL(rt_mutex_lock_killable);
+
 /**
  * rt_mutex_timed_lock - lock a rt_mutex interruptible
  *                     the timeout structure is provided
@@ -1516,6 +2153,7 @@ rt_mutex_timed_lock(struct rt_mutex *lock, struct hrtimer_sleeper *timeout)
 
        return rt_mutex_timed_fastlock(lock, TASK_INTERRUPTIBLE, timeout,
                                       RT_MUTEX_MIN_CHAINWALK,
+                                      NULL,
                                       rt_mutex_slowlock);
 }
 EXPORT_SYMBOL_GPL(rt_mutex_timed_lock);
@@ -1533,7 +2171,11 @@ EXPORT_SYMBOL_GPL(rt_mutex_timed_lock);
  */
 int __sched rt_mutex_trylock(struct rt_mutex *lock)
 {
+#ifdef CONFIG_PREEMPT_RT_FULL
+       if (WARN_ON_ONCE(in_irq() || in_nmi()))
+#else
        if (WARN_ON(in_irq() || in_nmi() || in_serving_softirq()))
+#endif
                return 0;
 
        return rt_mutex_fasttrylock(lock, rt_mutex_slowtrylock);
@@ -1559,13 +2201,14 @@ EXPORT_SYMBOL_GPL(rt_mutex_unlock);
  * required or not.
  */
 bool __sched rt_mutex_futex_unlock(struct rt_mutex *lock,
-                                  struct wake_q_head *wqh)
+                                  struct wake_q_head *wqh,
+                                  struct wake_q_head *wq_sleeper)
 {
        if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) {
                rt_mutex_deadlock_account_unlock(current);
                return false;
        }
-       return rt_mutex_slowunlock(lock, wqh);
+       return rt_mutex_slowunlock(lock, wqh, wq_sleeper);
 }
 
 /**
@@ -1598,13 +2241,12 @@ EXPORT_SYMBOL_GPL(rt_mutex_destroy);
 void __rt_mutex_init(struct rt_mutex *lock, const char *name)
 {
        lock->owner = NULL;
-       raw_spin_lock_init(&lock->wait_lock);
        lock->waiters = RB_ROOT;
        lock->waiters_leftmost = NULL;
 
        debug_rt_mutex_init(lock, name);
 }
-EXPORT_SYMBOL_GPL(__rt_mutex_init);
+EXPORT_SYMBOL(__rt_mutex_init);
 
 /**
  * rt_mutex_init_proxy_locked - initialize and lock a rt_mutex on behalf of a
@@ -1619,7 +2261,7 @@ EXPORT_SYMBOL_GPL(__rt_mutex_init);
 void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
                                struct task_struct *proxy_owner)
 {
-       __rt_mutex_init(lock, NULL);
+       rt_mutex_init(lock);
        debug_rt_mutex_proxy_lock(lock, proxy_owner);
        rt_mutex_set_owner(lock, proxy_owner);
        rt_mutex_deadlock_account_lock(lock, proxy_owner);
@@ -1660,13 +2302,42 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
 {
        int ret;
 
-       raw_spin_lock(&lock->wait_lock);
+       raw_spin_lock_irq(&lock->wait_lock);
 
        if (try_to_take_rt_mutex(lock, task, NULL)) {
-               raw_spin_unlock(&lock->wait_lock);
+               raw_spin_unlock_irq(&lock->wait_lock);
                return 1;
        }
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+       /*
+        * In PREEMPT_RT there's an added race.
+        * If the task, that we are about to requeue, times out,
+        * it can set the PI_WAKEUP_INPROGRESS. This tells the requeue
+        * to skip this task. But right after the task sets
+        * its pi_blocked_on to PI_WAKEUP_INPROGRESS it can then
+        * block on the spin_lock(&hb->lock), which in RT is an rtmutex.
+        * This will replace the PI_WAKEUP_INPROGRESS with the actual
+        * lock that it blocks on. We *must not* place this task
+        * on this proxy lock in that case.
+        *
+        * To prevent this race, we first take the task's pi_lock
+        * and check if it has updated its pi_blocked_on. If it has,
+        * we assume that it woke up and we return -EAGAIN.
+        * Otherwise, we set the task's pi_blocked_on to
+        * PI_REQUEUE_INPROGRESS, so that if the task is waking up
+        * it will know that we are in the process of requeuing it.
+        */
+       raw_spin_lock(&task->pi_lock);
+       if (task->pi_blocked_on) {
+               raw_spin_unlock(&task->pi_lock);
+               raw_spin_unlock_irq(&lock->wait_lock);
+               return -EAGAIN;
+       }
+       task->pi_blocked_on = PI_REQUEUE_INPROGRESS;
+       raw_spin_unlock(&task->pi_lock);
+#endif
+
        /* We enforce deadlock detection for futexes */
        ret = task_blocks_on_rt_mutex(lock, waiter, task,
                                      RT_MUTEX_FULL_CHAINWALK);
@@ -1681,10 +2352,10 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock,
                ret = 0;
        }
 
-       if (unlikely(ret))
+       if (ret && rt_mutex_has_waiters(lock))
                remove_waiter(lock, waiter);
 
-       raw_spin_unlock(&lock->wait_lock);
+       raw_spin_unlock_irq(&lock->wait_lock);
 
        debug_rt_mutex_print_deadlock(waiter);
 
@@ -1732,12 +2403,12 @@ int rt_mutex_finish_proxy_lock(struct rt_mutex *lock,
 {
        int ret;
 
-       raw_spin_lock(&lock->wait_lock);
+       raw_spin_lock_irq(&lock->wait_lock);
 
        set_current_state(TASK_INTERRUPTIBLE);
 
        /* sleep on the mutex */
-       ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter);
+       ret = __rt_mutex_slowlock(lock, TASK_INTERRUPTIBLE, to, waiter, NULL);
 
        if (unlikely(ret))
                remove_waiter(lock, waiter);
@@ -1748,7 +2419,93 @@ int rt_mutex_finish_proxy_lock(struct rt_mutex *lock,
         */
        fixup_rt_mutex_waiters(lock);
 
-       raw_spin_unlock(&lock->wait_lock);
+       raw_spin_unlock_irq(&lock->wait_lock);
+
+       return ret;
+}
+
+static inline int
+ww_mutex_deadlock_injection(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
+{
+#ifdef CONFIG_DEBUG_WW_MUTEX_SLOWPATH
+       unsigned tmp;
+
+       if (ctx->deadlock_inject_countdown-- == 0) {
+               tmp = ctx->deadlock_inject_interval;
+               if (tmp > UINT_MAX/4)
+                       tmp = UINT_MAX;
+               else
+                       tmp = tmp*2 + tmp + tmp/2;
+
+               ctx->deadlock_inject_interval = tmp;
+               ctx->deadlock_inject_countdown = tmp;
+               ctx->contending_lock = lock;
+
+               ww_mutex_unlock(lock);
+
+               return -EDEADLK;
+       }
+#endif
+
+       return 0;
+}
+
+#ifdef CONFIG_PREEMPT_RT_FULL
+int __sched
+__ww_mutex_lock_interruptible(struct ww_mutex *lock, struct ww_acquire_ctx *ww_ctx)
+{
+       int ret;
+
+       might_sleep();
+
+       mutex_acquire_nest(&lock->base.dep_map, 0, 0, &ww_ctx->dep_map, _RET_IP_);
+       ret = rt_mutex_slowlock(&lock->base.lock, TASK_INTERRUPTIBLE, NULL, 0, ww_ctx);
+       if (ret)
+               mutex_release(&lock->base.dep_map, 1, _RET_IP_);
+       else if (!ret && ww_ctx->acquired > 1)
+               return ww_mutex_deadlock_injection(lock, ww_ctx);
+
+       return ret;
+}
+EXPORT_SYMBOL_GPL(__ww_mutex_lock_interruptible);
+
+int __sched
+__ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ww_ctx)
+{
+       int ret;
+
+       might_sleep();
+
+       mutex_acquire_nest(&lock->base.dep_map, 0, 0, &ww_ctx->dep_map, _RET_IP_);
+       ret = rt_mutex_slowlock(&lock->base.lock, TASK_UNINTERRUPTIBLE, NULL, 0, ww_ctx);
+       if (ret)
+               mutex_release(&lock->base.dep_map, 1, _RET_IP_);
+       else if (!ret && ww_ctx->acquired > 1)
+               return ww_mutex_deadlock_injection(lock, ww_ctx);
 
        return ret;
 }
+EXPORT_SYMBOL_GPL(__ww_mutex_lock);
+
+void __sched ww_mutex_unlock(struct ww_mutex *lock)
+{
+       int nest = !!lock->ctx;
+
+       /*
+        * The unlocking fastpath is the 0->1 transition from 'locked'
+        * into 'unlocked' state:
+        */
+       if (nest) {
+#ifdef CONFIG_DEBUG_MUTEXES
+               DEBUG_LOCKS_WARN_ON(!lock->ctx->acquired);
+#endif
+               if (lock->ctx->acquired > 0)
+                       lock->ctx->acquired--;
+               lock->ctx = NULL;
+       }
+
+       mutex_release(&lock->base.dep_map, nest, _RET_IP_);
+       rt_mutex_unlock(&lock->base.lock);
+}
+EXPORT_SYMBOL(ww_mutex_unlock);
+#endif
diff --git a/kernel/locking/rtmutex_common.h b/kernel/locking/rtmutex_common.h
index e317e1cbb3eb..f457c7574920 100644
--- a/kernel/locking/rtmutex_common.h
+++ b/kernel/locking/rtmutex_common.h
@@ -27,6 +27,7 @@ struct rt_mutex_waiter {
        struct rb_node          pi_tree_entry;
        struct task_struct      *task;
        struct rt_mutex         *lock;
+       bool                    savestate;
 #ifdef CONFIG_DEBUG_RT_MUTEXES
        unsigned long           ip;
        struct pid              *deadlock_task_pid;
@@ -98,6 +99,9 @@ enum rtmutex_chainwalk {
 /*
  * PI-futex support (proxy locking functions, etc.):
  */
+#define PI_WAKEUP_INPROGRESS   ((struct rt_mutex_waiter *) 1)
+#define PI_REQUEUE_INPROGRESS  ((struct rt_mutex_waiter *) 2)
+
 extern struct task_struct *rt_mutex_next_owner(struct rt_mutex *lock);
 extern void rt_mutex_init_proxy_locked(struct rt_mutex *lock,
                                       struct task_struct *proxy_owner);
@@ -111,7 +115,8 @@ extern int rt_mutex_finish_proxy_lock(struct rt_mutex *lock,
                                      struct rt_mutex_waiter *waiter);
 extern int rt_mutex_timed_futex_lock(struct rt_mutex *l, struct hrtimer_sleeper *to);
 extern bool rt_mutex_futex_unlock(struct rt_mutex *lock,
-                                 struct wake_q_head *wqh);
+                                 struct wake_q_head *wqh,
+                                 struct wake_q_head *wq_sleeper);
 extern void rt_mutex_adjust_prio(struct task_struct *task);
 
 #ifdef CONFIG_DEBUG_RT_MUTEXES
@@ -120,4 +125,14 @@ extern void rt_mutex_adjust_prio(struct task_struct *task);
 # include "rtmutex.h"
 #endif
 
+static inline void
+rt_mutex_init_waiter(struct rt_mutex_waiter *waiter, bool savestate)
+{
+       debug_rt_mutex_init_waiter(waiter);
+       waiter->task = NULL;
+       waiter->savestate = savestate;
+       RB_CLEAR_NODE(&waiter->pi_tree_entry);
+       RB_CLEAR_NODE(&waiter->tree_entry);
+}
+
 #endif
diff --git a/kernel/locking/spinlock.c b/kernel/locking/spinlock.c
index db3ccb1dd614..909779647bd1 100644
--- a/kernel/locking/spinlock.c
+++ b/kernel/locking/spinlock.c
@@ -124,8 +124,11 @@ void __lockfunc __raw_##op##_lock_bh(locktype##_t *lock)           \
  *         __[spin|read|write]_lock_bh()
  */
 BUILD_LOCK_OPS(spin, raw_spinlock);
+
+#ifndef CONFIG_PREEMPT_RT_FULL
 BUILD_LOCK_OPS(read, rwlock);
 BUILD_LOCK_OPS(write, rwlock);
+#endif
 
 #endif
 
@@ -209,6 +212,8 @@ void __lockfunc _raw_spin_unlock_bh(raw_spinlock_t *lock)
 EXPORT_SYMBOL(_raw_spin_unlock_bh);
 #endif
 
+#ifndef CONFIG_PREEMPT_RT_FULL
+
 #ifndef CONFIG_INLINE_READ_TRYLOCK
 int __lockfunc _raw_read_trylock(rwlock_t *lock)
 {
@@ -353,6 +358,8 @@ void __lockfunc _raw_write_unlock_bh(rwlock_t *lock)
 EXPORT_SYMBOL(_raw_write_unlock_bh);
 #endif
 
+#endif /* !PREEMPT_RT_FULL */
+
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 
 void __lockfunc _raw_spin_lock_nested(raw_spinlock_t *lock, int subclass)
diff --git a/kernel/locking/spinlock_debug.c b/kernel/locking/spinlock_debug.c
index 0374a596cffa..94970338d518 100644
--- a/kernel/locking/spinlock_debug.c
+++ b/kernel/locking/spinlock_debug.c
@@ -31,6 +31,7 @@ void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name,
 
 EXPORT_SYMBOL(__raw_spin_lock_init);
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 void __rwlock_init(rwlock_t *lock, const char *name,
                   struct lock_class_key *key)
 {
@@ -48,6 +49,7 @@ void __rwlock_init(rwlock_t *lock, const char *name,
 }
 
 EXPORT_SYMBOL(__rwlock_init);
+#endif
 
 static void spin_dump(raw_spinlock_t *lock, const char *msg)
 {
@@ -159,6 +161,7 @@ void do_raw_spin_unlock(raw_spinlock_t *lock)
        arch_spin_unlock(&lock->raw_lock);
 }
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 static void rwlock_bug(rwlock_t *lock, const char *msg)
 {
        if (!debug_locks_off())
@@ -300,3 +303,5 @@ void do_raw_write_unlock(rwlock_t *lock)
        debug_write_unlock(lock);
        arch_write_unlock(&lock->raw_lock);
 }
+
+#endif
diff --git a/kernel/module.c b/kernel/module.c
index 0a56098d3738..33c1954b07ed 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -682,16 +682,7 @@ static void percpu_modcopy(struct module *mod,
                memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
 }
 
-/**
- * is_module_percpu_address - test whether address is from module static percpu
- * @addr: address to test
- *
- * Test whether @addr belongs to module static percpu area.
- *
- * RETURNS:
- * %true if @addr is from module static percpu area
- */
-bool is_module_percpu_address(unsigned long addr)
+bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
 {
        struct module *mod;
        unsigned int cpu;
@@ -705,9 +696,11 @@ bool is_module_percpu_address(unsigned long addr)
                        continue;
                for_each_possible_cpu(cpu) {
                        void *start = per_cpu_ptr(mod->percpu, cpu);
+                       void *va = (void *)addr;
 
-                       if ((void *)addr >= start &&
-                           (void *)addr < start + mod->percpu_size) {
+                       if (va >= start && va < start + mod->percpu_size) {
+                               if (can_addr)
+                                       *can_addr = (unsigned long) (va - start);
                                preempt_enable();
                                return true;
                        }
@@ -718,6 +711,20 @@ bool is_module_percpu_address(unsigned long addr)
        return false;
 }
 
+/**
+ * is_module_percpu_address - test whether address is from module static percpu
+ * @addr: address to test
+ *
+ * Test whether @addr belongs to module static percpu area.
+ *
+ * RETURNS:
+ * %true if @addr is from module static percpu area
+ */
+bool is_module_percpu_address(unsigned long addr)
+{
+       return __is_module_percpu_address(addr, NULL);
+}
+
 #else /* ... !CONFIG_SMP */
 
 static inline void __percpu *mod_percpu(struct module *mod)
@@ -749,6 +756,11 @@ bool is_module_percpu_address(unsigned long addr)
        return false;
 }
 
+bool __is_module_percpu_address(unsigned long addr, unsigned long *can_addr)
+{
+       return false;
+}
+
 #endif /* CONFIG_SMP */
 
 #define MODINFO_ATTR(field)    \
diff --git a/kernel/panic.c b/kernel/panic.c
index 1d07cf9af849..e182564e6533 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -61,6 +61,37 @@ void __weak panic_smp_self_stop(void)
                cpu_relax();
 }
 
+/*
+ * Stop ourselves in NMI context if another CPU has already panicked. Arch code
+ * may override this to prepare for crash dumping, e.g. save regs info.
+ */
+void __weak nmi_panic_self_stop(struct pt_regs *regs)
+{
+       panic_smp_self_stop();
+}
+
+atomic_t panic_cpu = ATOMIC_INIT(PANIC_CPU_INVALID);
+
+/*
+ * A variant of panic() called from NMI context. We return if we've already
+ * panicked on this CPU. If another CPU already panicked, loop in
+ * nmi_panic_self_stop() which can provide architecture dependent code such
+ * as saving register state for crash dump.
+ */
+void nmi_panic(struct pt_regs *regs, const char *msg)
+{
+       int old_cpu, cpu;
+
+       cpu = raw_smp_processor_id();
+       old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, cpu);
+
+       if (old_cpu == PANIC_CPU_INVALID)
+               panic("%s", msg);
+       else if (old_cpu != cpu)
+               nmi_panic_self_stop(regs);
+}
+EXPORT_SYMBOL(nmi_panic);
+
 /**
  *     panic - halt the system
  *     @fmt: The text string to print
@@ -71,17 +102,17 @@ void __weak panic_smp_self_stop(void)
  */
 void panic(const char *fmt, ...)
 {
-       static DEFINE_SPINLOCK(panic_lock);
        static char buf[1024];
        va_list args;
        long i, i_next = 0;
        int state = 0;
+       int old_cpu, this_cpu;
 
        /*
         * Disable local interrupts. This will prevent panic_smp_self_stop
         * from deadlocking the first cpu that invokes the panic, since
         * there is nothing to prevent an interrupt handler (that runs
-        * after the panic_lock is acquired) from invoking panic again.
+        * after setting panic_cpu) from invoking panic() again.
         */
        local_irq_disable();
 
@@ -94,8 +125,16 @@ void panic(const char *fmt, ...)
         * multiple parallel invocations of panic, all other CPUs either
         * stop themself or will wait until they are stopped by the 1st CPU
         * with smp_send_stop().
+        *
+        * `old_cpu == PANIC_CPU_INVALID' means this is the 1st CPU which
+        * comes here, so go ahead.
+        * `old_cpu == this_cpu' means we came from nmi_panic() which sets
+        * panic_cpu to this CPU.  In this case, this is also the 1st CPU.
         */
-       if (!spin_trylock(&panic_lock))
+       this_cpu = raw_smp_processor_id();
+       old_cpu  = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, this_cpu);
+
+       if (old_cpu != PANIC_CPU_INVALID && old_cpu != this_cpu)
                panic_smp_self_stop();
 
        console_verbose();
@@ -400,9 +439,11 @@ static u64 oops_id;
 
 static int init_oops_id(void)
 {
+#ifndef CONFIG_PREEMPT_RT_FULL
        if (!oops_id)
                get_random_bytes(&oops_id, sizeof(oops_id));
        else
+#endif
                oops_id++;
 
        return 0;
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 3124cebaec31..c1b981521dd0 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -285,6 +285,8 @@ static int create_image(int platform_mode)
 
        local_irq_disable();
 
+       system_state = SYSTEM_SUSPEND;
+
        error = syscore_suspend();
        if (error) {
                printk(KERN_ERR "PM: Some system devices failed to power down, "
@@ -314,6 +316,7 @@ static int create_image(int platform_mode)
        syscore_resume();
 
  Enable_irqs:
+       system_state = SYSTEM_RUNNING;
        local_irq_enable();
 
  Enable_cpus:
@@ -438,6 +441,7 @@ static int resume_target_kernel(bool platform_mode)
                goto Enable_cpus;
 
        local_irq_disable();
+       system_state = SYSTEM_SUSPEND;
 
        error = syscore_suspend();
        if (error)
@@ -471,6 +475,7 @@ static int resume_target_kernel(bool platform_mode)
        syscore_resume();
 
  Enable_irqs:
+       system_state = SYSTEM_RUNNING;
        local_irq_enable();
 
  Enable_cpus:
@@ -556,6 +561,7 @@ int hibernation_platform_enter(void)
                goto Enable_cpus;
 
        local_irq_disable();
+       system_state = SYSTEM_SUSPEND;
        syscore_suspend();
        if (pm_wakeup_pending()) {
                error = -EAGAIN;
@@ -568,6 +574,7 @@ int hibernation_platform_enter(void)
 
  Power_up:
        syscore_resume();
+       system_state = SYSTEM_RUNNING;
        local_irq_enable();
 
  Enable_cpus:
@@ -642,6 +649,10 @@ static void power_down(void)
                cpu_relax();
 }
 
+#ifndef CONFIG_SUSPEND
+bool pm_in_action;
+#endif
+
 /**
  * hibernate - Carry out system hibernation, including saving the image.
  */
@@ -654,6 +665,8 @@ int hibernate(void)
                return -EPERM;
        }
 
+       pm_in_action = true;
+
        lock_system_sleep();
        /* The snapshot device should not be opened while we're running */
        if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
@@ -719,6 +732,7 @@ int hibernate(void)
        atomic_inc(&snapshot_device_available);
  Unlock:
        unlock_system_sleep();
+       pm_in_action = false;
        return error;
 }
 
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index f9fe133c13e2..393bc342c586 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -359,6 +359,8 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
        arch_suspend_disable_irqs();
        BUG_ON(!irqs_disabled());
 
+       system_state = SYSTEM_SUSPEND;
+
        error = syscore_suspend();
        if (!error) {
                *wakeup = pm_wakeup_pending();
@@ -375,6 +377,8 @@ static int suspend_enter(suspend_state_t state, bool *wakeup)
                syscore_resume();
        }
 
+       system_state = SYSTEM_RUNNING;
+
        arch_suspend_enable_irqs();
        BUG_ON(irqs_disabled());
 
@@ -518,6 +522,8 @@ static int enter_state(suspend_state_t state)
        return error;
 }
 
+bool pm_in_action;
+
 /**
  * pm_suspend - Externally visible function for suspending the system.
  * @state: System sleep state to enter.
@@ -532,6 +538,8 @@ int pm_suspend(suspend_state_t state)
        if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX)
                return -EINVAL;
 
+       pm_in_action = true;
+
        error = enter_state(state);
        if (error) {
                suspend_stats.fail++;
@@ -539,6 +547,7 @@ int pm_suspend(suspend_state_t state)
        } else {
                suspend_stats.success++;
        }
+       pm_in_action = false;
        return error;
 }
 EXPORT_SYMBOL(pm_suspend);
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 0b5613554769..99deb2617308 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -241,6 +241,65 @@ struct printk_log {
  */
 static DEFINE_RAW_SPINLOCK(logbuf_lock);
 
+#ifdef CONFIG_EARLY_PRINTK
+struct console *early_console;
+
+static void early_vprintk(const char *fmt, va_list ap)
+{
+       if (early_console) {
+               char buf[512];
+               int n = vscnprintf(buf, sizeof(buf), fmt, ap);
+
+               early_console->write(early_console, buf, n);
+       }
+}
+
+asmlinkage void early_printk(const char *fmt, ...)
+{
+       va_list ap;
+
+       va_start(ap, fmt);
+       early_vprintk(fmt, ap);
+       va_end(ap);
+}
+
+/*
+ * This is independent of any log levels - a global
+ * kill switch that turns off all of printk.
+ *
+ * Used by the NMI watchdog if early-printk is enabled.
+ */
+static bool __read_mostly printk_killswitch;
+
+static int __init force_early_printk_setup(char *str)
+{
+       printk_killswitch = true;
+       return 0;
+}
+early_param("force_early_printk", force_early_printk_setup);
+
+void printk_kill(void)
+{
+       printk_killswitch = true;
+}
+
+#ifdef CONFIG_PRINTK
+static int forced_early_printk(const char *fmt, va_list ap)
+{
+       if (!printk_killswitch)
+               return 0;
+       early_vprintk(fmt, ap);
+       return 1;
+}
+#endif
+
+#else
+static inline int forced_early_printk(const char *fmt, va_list ap)
+{
+       return 0;
+}
+#endif
+
 #ifdef CONFIG_PRINTK
 DECLARE_WAIT_QUEUE_HEAD(log_wait);
 /* the next printk record to read by syslog(READ) or /proc/kmsg */
@@ -1203,6 +1262,7 @@ static int syslog_print_all(char __user *buf, int size, bool clear)
 {
        char *text;
        int len = 0;
+       int attempts = 0;
 
        text = kmalloc(LOG_LINE_MAX + PREFIX_MAX, GFP_KERNEL);
        if (!text)
@@ -1214,7 +1274,14 @@ static int syslog_print_all(char __user *buf, int size, bool clear)
                u64 seq;
                u32 idx;
                enum log_flags prev;
-
+               int num_msg;
+try_again:
+               attempts++;
+               if (attempts > 10) {
+                       len = -EBUSY;
+                       goto out;
+               }
+               num_msg = 0;
                if (clear_seq < log_first_seq) {
                        /* messages are gone, move to first available one */
                        clear_seq = log_first_seq;
@@ -1235,6 +1302,14 @@ static int syslog_print_all(char __user *buf, int size, bool clear)
                        prev = msg->flags;
                        idx = log_next(idx);
                        seq++;
+                       num_msg++;
+                       if (num_msg > 5) {
+                               num_msg = 0;
+                               raw_spin_unlock_irq(&logbuf_lock);
+                               raw_spin_lock_irq(&logbuf_lock);
+                               if (clear_seq < log_first_seq)
+                                       goto try_again;
+                       }
                }
 
                /* move first record forward until length fits into the buffer */
@@ -1248,6 +1323,14 @@ static int syslog_print_all(char __user *buf, int size, bool clear)
                        prev = msg->flags;
                        idx = log_next(idx);
                        seq++;
+                       num_msg++;
+                       if (num_msg > 5) {
+                               num_msg = 0;
+                               raw_spin_unlock_irq(&logbuf_lock);
+                               raw_spin_lock_irq(&logbuf_lock);
+                               if (clear_seq < log_first_seq)
+                                       goto try_again;
+                       }
                }
 
                /* last message fitting into this dump */
@@ -1288,6 +1371,7 @@ static int syslog_print_all(char __user *buf, int size, bool clear)
                clear_seq = log_next_seq;
                clear_idx = log_next_idx;
        }
+out:
        raw_spin_unlock_irq(&logbuf_lock);
 
        kfree(text);
@@ -1443,6 +1527,12 @@ static void call_console_drivers(int level,
        if (!console_drivers)
                return;
 
+       if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) {
+               if (in_irq() || in_nmi())
+                       return;
+       }
+
+       migrate_disable();
        for_each_console(con) {
                if (exclusive_console && con != exclusive_console)
                        continue;
@@ -1458,6 +1548,7 @@ static void call_console_drivers(int level,
                else
                        con->write(con, text, len);
        }
+       migrate_enable();
 }
 
 /*
@@ -1518,6 +1609,15 @@ static inline int can_use_console(unsigned int cpu)
 static int console_trylock_for_printk(void)
 {
        unsigned int cpu = smp_processor_id();
+#ifdef CONFIG_PREEMPT_RT_FULL
+       int lock = !early_boot_irqs_disabled && (preempt_count() == 0) &&
+               !irqs_disabled();
+#else
+       int lock = 1;
+#endif
+
+       if (!lock)
+               return 0;
 
        if (!console_trylock())
                return 0;
@@ -1672,6 +1772,13 @@ asmlinkage int vprintk_emit(int facility, int level,
        /* cpu currently holding logbuf_lock in this function */
        static unsigned int logbuf_cpu = UINT_MAX;
 
+       /*
+        * Fall back to early_printk if a debugging subsystem has
+        * killed printk output
+        */
+       if (unlikely(forced_early_printk(fmt, args)))
+               return 1;
+
        if (level == LOGLEVEL_SCHED) {
                level = LOGLEVEL_DEFAULT;
                in_sched = true;
@@ -1813,8 +1920,7 @@ asmlinkage int vprintk_emit(int facility, int level,
                 * console_sem which would prevent anyone from printing to
                 * console
                 */
-               preempt_disable();
-
+               migrate_disable();
                /*
                 * Try to acquire and then immediately release the console
                 * semaphore.  The release will print out buffers and wake up
@@ -1822,7 +1928,7 @@ asmlinkage int vprintk_emit(int facility, int level,
                 */
                if (console_trylock_for_printk())
                        console_unlock();
-               preempt_enable();
+               migrate_enable();
                lockdep_on();
        }
 
@@ -1961,26 +2067,6 @@ DEFINE_PER_CPU(printk_func_t, printk_func);
 
 #endif /* CONFIG_PRINTK */
 
-#ifdef CONFIG_EARLY_PRINTK
-struct console *early_console;
-
-asmlinkage __visible void early_printk(const char *fmt, ...)
-{
-       va_list ap;
-       char buf[512];
-       int n;
-
-       if (!early_console)
-               return;
-
-       va_start(ap, fmt);
-       n = vscnprintf(buf, sizeof(buf), fmt, ap);
-       va_end(ap);
-
-       early_console->write(early_console, buf, n);
-}
-#endif
-
 static int __add_preferred_console(char *name, int idx, char *options,
                                   char *brl_options)
 {
@@ -2202,11 +2288,16 @@ static void console_cont_flush(char *text, size_t size)
                goto out;
 
        len = cont_print_text(text, size);
+#ifdef CONFIG_PREEMPT_RT_FULL
+       raw_spin_unlock_irqrestore(&logbuf_lock, flags);
+       call_console_drivers(cont.level, NULL, 0, text, len);
+#else
        raw_spin_unlock(&logbuf_lock);
        stop_critical_timings();
        call_console_drivers(cont.level, NULL, 0, text, len);
        start_critical_timings();
        local_irq_restore(flags);
+#endif
        return;
 out:
        raw_spin_unlock_irqrestore(&logbuf_lock, flags);
@@ -2316,13 +2407,17 @@ void console_unlock(void)
                console_idx = log_next(console_idx);
                console_seq++;
                console_prev = msg->flags;
+#ifdef CONFIG_PREEMPT_RT_FULL
+               raw_spin_unlock_irqrestore(&logbuf_lock, flags);
+               call_console_drivers(level, ext_text, ext_len, text, len);
+#else
                raw_spin_unlock(&logbuf_lock);
 
                stop_critical_timings();        /* don't trace print latency */
                call_console_drivers(level, ext_text, ext_len, text, len);
                start_critical_timings();
                local_irq_restore(flags);
-
+#endif
                if (do_cond_resched)
                        cond_resched();
        }
@@ -2374,6 +2469,11 @@ void console_unblank(void)
 {
        struct console *c;
 
+       if (IS_ENABLED(CONFIG_PREEMPT_RT_BASE)) {
+               if (in_irq() || in_nmi())
+                       return;
+       }
+
        /*
         * console_unblank can no longer be called in interrupt context unless
         * oops_in_progress is set to 1..
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 5e2cd1030702..d4467d4eb488 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -142,7 +142,14 @@ static bool ptrace_freeze_traced(struct task_struct *task)
 
        spin_lock_irq(&task->sighand->siglock);
        if (task_is_traced(task) && !__fatal_signal_pending(task)) {
-               task->state = __TASK_TRACED;
+               unsigned long flags;
+
+               raw_spin_lock_irqsave(&task->pi_lock, flags);
+               if (task->state & __TASK_TRACED)
+                       task->state = __TASK_TRACED;
+               else
+                       task->saved_state = __TASK_TRACED;
+               raw_spin_unlock_irqrestore(&task->pi_lock, flags);
                ret = true;
        }
        spin_unlock_irq(&task->sighand->siglock);
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index d89328e260df..5bb3364a6284 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -390,6 +390,7 @@ static struct rcu_torture_ops rcu_ops = {
        .name           = "rcu"
 };
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 /*
  * Definitions for rcu_bh torture testing.
  */
@@ -429,6 +430,12 @@ static struct rcu_torture_ops rcu_bh_ops = {
        .name           = "rcu_bh"
 };
 
+#else
+static struct rcu_torture_ops rcu_bh_ops = {
+       .ttype          = INVALID_RCU_FLAVOR,
+};
+#endif
+
 /*
  * Don't even think about trying any of these in real life!!!
  * The names includes "busted", and they really means it!
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 8a62cbfe1f2f..f60894c6b35c 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -56,6 +56,11 @@
 #include <linux/random.h>
 #include <linux/trace_events.h>
 #include <linux/suspend.h>
+#include <linux/delay.h>
+#include <linux/gfp.h>
+#include <linux/oom.h>
+#include <linux/smpboot.h>
+#include "../time/tick-internal.h"
 
 #include "tree.h"
 #include "rcu.h"
@@ -266,6 +271,19 @@ void rcu_sched_qs(void)
        }
 }
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+static void rcu_preempt_qs(void);
+
+void rcu_bh_qs(void)
+{
+       unsigned long flags;
+
+       /* Callers to this function, rcu_preempt_qs(), must disable irqs. */
+       local_irq_save(flags);
+       rcu_preempt_qs();
+       local_irq_restore(flags);
+}
+#else
 void rcu_bh_qs(void)
 {
        if (__this_cpu_read(rcu_bh_data.cpu_no_qs.s)) {
@@ -275,6 +293,7 @@ void rcu_bh_qs(void)
                __this_cpu_write(rcu_bh_data.cpu_no_qs.b.norm, false);
        }
 }
+#endif
 
 static DEFINE_PER_CPU(int, rcu_sched_qs_mask);
 
@@ -435,11 +454,13 @@ EXPORT_SYMBOL_GPL(rcu_batches_started_sched);
 /*
  * Return the number of RCU BH batches started thus far for debug & stats.
  */
+#ifndef CONFIG_PREEMPT_RT_FULL
 unsigned long rcu_batches_started_bh(void)
 {
        return rcu_bh_state.gpnum;
 }
 EXPORT_SYMBOL_GPL(rcu_batches_started_bh);
+#endif
 
 /*
  * Return the number of RCU batches completed thus far for debug & stats.
@@ -459,6 +480,7 @@ unsigned long rcu_batches_completed_sched(void)
 }
 EXPORT_SYMBOL_GPL(rcu_batches_completed_sched);
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 /*
  * Return the number of RCU BH batches completed thus far for debug & stats.
  */
@@ -486,6 +508,13 @@ void rcu_bh_force_quiescent_state(void)
 }
 EXPORT_SYMBOL_GPL(rcu_bh_force_quiescent_state);
 
+#else
+void rcu_force_quiescent_state(void)
+{
+}
+EXPORT_SYMBOL_GPL(rcu_force_quiescent_state);
+#endif
+
 /*
  * Force a quiescent state for RCU-sched.
  */
@@ -536,9 +565,11 @@ void rcutorture_get_gp_data(enum rcutorture_type test_type, int *flags,
        case RCU_FLAVOR:
                rsp = rcu_state_p;
                break;
+#ifndef CONFIG_PREEMPT_RT_FULL
        case RCU_BH_FLAVOR:
                rsp = &rcu_bh_state;
                break;
+#endif
        case RCU_SCHED_FLAVOR:
                rsp = &rcu_sched_state;
                break;
@@ -1602,7 +1633,6 @@ static int rcu_future_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp)
        int needmore;
        struct rcu_data *rdp = this_cpu_ptr(rsp->rda);
 
-       rcu_nocb_gp_cleanup(rsp, rnp);
        rnp->need_future_gp[c & 0x1] = 0;
        needmore = rnp->need_future_gp[(c + 1) & 0x1];
        trace_rcu_future_gp(rnp, rdp, c,
@@ -1623,7 +1653,7 @@ static void rcu_gp_kthread_wake(struct rcu_state *rsp)
            !READ_ONCE(rsp->gp_flags) ||
            !rsp->gp_kthread)
                return;
-       wake_up(&rsp->gp_wq);
+       swake_up(&rsp->gp_wq);
 }
 
 /*
@@ -2003,6 +2033,7 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
        int nocb = 0;
        struct rcu_data *rdp;
        struct rcu_node *rnp = rcu_get_root(rsp);
+       struct swait_queue_head *sq;
 
        WRITE_ONCE(rsp->gp_activity, jiffies);
        raw_spin_lock_irq(&rnp->lock);
@@ -2041,7 +2072,9 @@ static void rcu_gp_cleanup(struct rcu_state *rsp)
                        needgp = __note_gp_changes(rsp, rnp, rdp) || needgp;
                /* smp_mb() provided by prior unlock-lock pair. */
                nocb += rcu_future_gp_cleanup(rsp, rnp);
+               sq = rcu_nocb_gp_get(rnp);
                raw_spin_unlock_irq(&rnp->lock);
+               rcu_nocb_gp_cleanup(sq);
                cond_resched_rcu_qs();
                WRITE_ONCE(rsp->gp_activity, jiffies);
                rcu_gp_slow(rsp, gp_cleanup_delay);
@@ -2088,7 +2121,7 @@ static int __noreturn rcu_gp_kthread(void *arg)
                                               READ_ONCE(rsp->gpnum),
                                               TPS("reqwait"));
                        rsp->gp_state = RCU_GP_WAIT_GPS;
-                       wait_event_interruptible(rsp->gp_wq,
+                       swait_event_interruptible(rsp->gp_wq,
                                                 READ_ONCE(rsp->gp_flags) &
                                                 RCU_GP_FLAG_INIT);
                        rsp->gp_state = RCU_GP_DONE_GPS;
@@ -2118,7 +2151,7 @@ static int __noreturn rcu_gp_kthread(void *arg)
                                               READ_ONCE(rsp->gpnum),
                                               TPS("fqswait"));
                        rsp->gp_state = RCU_GP_WAIT_FQS;
-                       ret = wait_event_interruptible_timeout(rsp->gp_wq,
+                       ret = swait_event_interruptible_timeout(rsp->gp_wq,
                                        rcu_gp_fqs_check_wake(rsp, &gf), j);
                        rsp->gp_state = RCU_GP_DOING_FQS;
                        /* Locking provides needed memory barriers. */
@@ -2242,7 +2275,7 @@ static void rcu_report_qs_rsp(struct rcu_state *rsp, unsigned long flags)
        WARN_ON_ONCE(!rcu_gp_in_progress(rsp));
        WRITE_ONCE(rsp->gp_flags, READ_ONCE(rsp->gp_flags) | RCU_GP_FLAG_FQS);
        raw_spin_unlock_irqrestore(&rcu_get_root(rsp)->lock, flags);
-       rcu_gp_kthread_wake(rsp);
+       swake_up(&rsp->gp_wq);  /* Memory barrier implied by swake_up() path. */
 }
 
 /*
@@ -2903,7 +2936,7 @@ static void force_quiescent_state(struct rcu_state *rsp)
        }
        WRITE_ONCE(rsp->gp_flags, READ_ONCE(rsp->gp_flags) | RCU_GP_FLAG_FQS);
        raw_spin_unlock_irqrestore(&rnp_old->lock, flags);
-       rcu_gp_kthread_wake(rsp);
+       swake_up(&rsp->gp_wq); /* Memory barrier implied by swake_up() path. */
 }
 
 /*
@@ -2946,18 +2979,17 @@ __rcu_process_callbacks(struct rcu_state *rsp)
 /*
  * Do RCU core processing for the current CPU.
  */
-static void rcu_process_callbacks(struct softirq_action *unused)
+static void rcu_process_callbacks(void)
 {
        struct rcu_state *rsp;
 
        if (cpu_is_offline(smp_processor_id()))
                return;
-       trace_rcu_utilization(TPS("Start RCU core"));
        for_each_rcu_flavor(rsp)
                __rcu_process_callbacks(rsp);
-       trace_rcu_utilization(TPS("End RCU core"));
 }
 
+static DEFINE_PER_CPU(struct task_struct *, rcu_cpu_kthread_task);
 /*
  * Schedule RCU callback invocation.  If the specified type of RCU
  * does not support RCU priority boosting, just do a direct call,
@@ -2969,18 +3001,105 @@ static void invoke_rcu_callbacks(struct rcu_state *rsp, struct rcu_data *rdp)
 {
        if (unlikely(!READ_ONCE(rcu_scheduler_fully_active)))
                return;
-       if (likely(!rsp->boost)) {
-               rcu_do_batch(rsp, rdp);
-               return;
-       }
-       invoke_rcu_callbacks_kthread();
+       rcu_do_batch(rsp, rdp);
 }
 
+static void rcu_wake_cond(struct task_struct *t, int status)
+{
+       /*
+        * If the thread is yielding, only wake it when this
+        * is invoked from idle
+        */
+       if (t && (status != RCU_KTHREAD_YIELDING || is_idle_task(current)))
+               wake_up_process(t);
+}
+
+/*
+ * Wake up this CPU's rcuc kthread to do RCU core processing.
+ */
 static void invoke_rcu_core(void)
 {
-       if (cpu_online(smp_processor_id()))
-               raise_softirq(RCU_SOFTIRQ);
+       unsigned long flags;
+       struct task_struct *t;
+
+       if (!cpu_online(smp_processor_id()))
+               return;
+       local_irq_save(flags);
+       __this_cpu_write(rcu_cpu_has_work, 1);
+       t = __this_cpu_read(rcu_cpu_kthread_task);
+       if (t != NULL && current != t)
+               rcu_wake_cond(t, __this_cpu_read(rcu_cpu_kthread_status));
+       local_irq_restore(flags);
+}
+
+static void rcu_cpu_kthread_park(unsigned int cpu)
+{
+       per_cpu(rcu_cpu_kthread_status, cpu) = RCU_KTHREAD_OFFCPU;
+}
+
+static int rcu_cpu_kthread_should_run(unsigned int cpu)
+{
+       return __this_cpu_read(rcu_cpu_has_work);
+}
+
+/*
+ * Per-CPU kernel thread that invokes RCU callbacks.  This replaces the
+ * RCU softirq used in flavors and configurations of RCU that do not
+ * support RCU priority boosting.
+ */
+static void rcu_cpu_kthread(unsigned int cpu)
+{
+       unsigned int *statusp = this_cpu_ptr(&rcu_cpu_kthread_status);
+       char work, *workp = this_cpu_ptr(&rcu_cpu_has_work);
+       int spincnt;
+
+       for (spincnt = 0; spincnt < 10; spincnt++) {
+               trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait"));
+               local_bh_disable();
+               *statusp = RCU_KTHREAD_RUNNING;
+               this_cpu_inc(rcu_cpu_kthread_loops);
+               local_irq_disable();
+               work = *workp;
+               *workp = 0;
+               local_irq_enable();
+               if (work)
+                       rcu_process_callbacks();
+               local_bh_enable();
+               if (*workp == 0) {
+                       trace_rcu_utilization(TPS("End CPU kthread@rcu_wait"));
+                       *statusp = RCU_KTHREAD_WAITING;
+                       return;
+               }
+       }
+       *statusp = RCU_KTHREAD_YIELDING;
+       trace_rcu_utilization(TPS("Start CPU kthread@rcu_yield"));
+       schedule_timeout_interruptible(2);
+       trace_rcu_utilization(TPS("End CPU kthread@rcu_yield"));
+       *statusp = RCU_KTHREAD_WAITING;
+}
+
+static struct smp_hotplug_thread rcu_cpu_thread_spec = {
+       .store                  = &rcu_cpu_kthread_task,
+       .thread_should_run      = rcu_cpu_kthread_should_run,
+       .thread_fn              = rcu_cpu_kthread,
+       .thread_comm            = "rcuc/%u",
+       .setup                  = rcu_cpu_kthread_setup,
+       .park                   = rcu_cpu_kthread_park,
+};
+
+/*
+ * Spawn per-CPU RCU core processing kthreads.
+ */
+static int __init rcu_spawn_core_kthreads(void)
+{
+       int cpu;
+
+       for_each_possible_cpu(cpu)
+               per_cpu(rcu_cpu_has_work, cpu) = 0;
+       BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec));
+       return 0;
 }
+early_initcall(rcu_spawn_core_kthreads);
 
 /*
  * Handle any core-RCU processing required by a call_rcu() invocation.
@@ -3126,6 +3245,7 @@ void call_rcu_sched(struct rcu_head *head, rcu_callback_t func)
 }
 EXPORT_SYMBOL_GPL(call_rcu_sched);
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 /*
  * Queue an RCU callback for invocation after a quicker grace period.
  */
@@ -3134,6 +3254,7 @@ void call_rcu_bh(struct rcu_head *head, rcu_callback_t func)
        __call_rcu(head, func, &rcu_bh_state, -1, 0);
 }
 EXPORT_SYMBOL_GPL(call_rcu_bh);
+#endif
 
 /*
  * Queue an RCU callback for lazy invocation after a grace period.
@@ -3225,6 +3346,7 @@ void synchronize_sched(void)
 }
 EXPORT_SYMBOL_GPL(synchronize_sched);
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 /**
  * synchronize_rcu_bh - wait until an rcu_bh grace period has elapsed.
  *
@@ -3251,6 +3373,7 @@ void synchronize_rcu_bh(void)
                wait_rcu_gp(call_rcu_bh);
 }
 EXPORT_SYMBOL_GPL(synchronize_rcu_bh);
+#endif
 
 /**
  * get_state_synchronize_rcu - Snapshot current RCU state
@@ -3536,7 +3659,7 @@ static void __rcu_report_exp_rnp(struct rcu_state *rsp, struct rcu_node *rnp,
                        raw_spin_unlock_irqrestore(&rnp->lock, flags);
                        if (wake) {
                                smp_mb(); /* EGP done before wake_up(). */
-                               wake_up(&rsp->expedited_wq);
+                               swake_up(&rsp->expedited_wq);
                        }
                        break;
                }
@@ -3793,7 +3916,7 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
        jiffies_start = jiffies;
 
        for (;;) {
-               ret = wait_event_interruptible_timeout(
+               ret = swait_event_timeout(
                                rsp->expedited_wq,
                                sync_rcu_preempt_exp_done(rnp_root),
                                jiffies_stall);
@@ -3801,7 +3924,7 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
                        return;
                if (ret < 0) {
                        /* Hit a signal, disable CPU stall warnings. */
-                       wait_event(rsp->expedited_wq,
+                       swait_event(rsp->expedited_wq,
                                   sync_rcu_preempt_exp_done(rnp_root));
                        return;
                }
@@ -4113,6 +4236,7 @@ static void _rcu_barrier(struct rcu_state *rsp)
        mutex_unlock(&rsp->barrier_mutex);
 }
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 /**
  * rcu_barrier_bh - Wait until all in-flight call_rcu_bh() callbacks complete.
  */
@@ -4121,6 +4245,7 @@ void rcu_barrier_bh(void)
        _rcu_barrier(&rcu_bh_state);
 }
 EXPORT_SYMBOL_GPL(rcu_barrier_bh);
+#endif
 
 /**
  * rcu_barrier_sched - Wait for in-flight call_rcu_sched() callbacks.
@@ -4467,8 +4592,8 @@ static void __init rcu_init_one(struct rcu_state *rsp,
                }
        }
 
-       init_waitqueue_head(&rsp->gp_wq);
-       init_waitqueue_head(&rsp->expedited_wq);
+       init_swait_queue_head(&rsp->gp_wq);
+       init_swait_queue_head(&rsp->expedited_wq);
        rnp = rsp->level[rcu_num_lvls - 1];
        for_each_possible_cpu(i) {
                while (i > rnp->grphi)
@@ -4588,12 +4713,13 @@ void __init rcu_init(void)
 
        rcu_bootup_announce();
        rcu_init_geometry();
+#ifndef CONFIG_PREEMPT_RT_FULL
        rcu_init_one(&rcu_bh_state, &rcu_bh_data);
+#endif
        rcu_init_one(&rcu_sched_state, &rcu_sched_data);
        if (dump_tree)
                rcu_dump_rcu_node_tree(&rcu_sched_state);
        __rcu_init_preempt();
-       open_softirq(RCU_SOFTIRQ, rcu_process_callbacks);
 
        /*
         * We don't need protection against CPU-hotplug here because
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 9fb4e238d4dc..c75834d8de24 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -27,6 +27,7 @@
 #include <linux/threads.h>
 #include <linux/cpumask.h>
 #include <linux/seqlock.h>
+#include <linux/swait.h>
 #include <linux/stop_machine.h>
 
 /*
@@ -241,7 +242,7 @@ struct rcu_node {
                                /* Refused to boost: not sure why, though. */
                                /*  This can happen due to race conditions. */
 #ifdef CONFIG_RCU_NOCB_CPU
-       wait_queue_head_t nocb_gp_wq[2];
+       struct swait_queue_head nocb_gp_wq[2];
                                /* Place for rcu_nocb_kthread() to wait GP. */
 #endif /* #ifdef CONFIG_RCU_NOCB_CPU */
        int need_future_gp[2];
@@ -393,7 +394,7 @@ struct rcu_data {
        atomic_long_t nocb_q_count_lazy; /*  invocation (all stages). */
        struct rcu_head *nocb_follower_head; /* CBs ready to invoke. */
        struct rcu_head **nocb_follower_tail;
-       wait_queue_head_t nocb_wq;      /* For nocb kthreads to sleep on. */
+       struct swait_queue_head nocb_wq; /* For nocb kthreads to sleep on. */
        struct task_struct *nocb_kthread;
        int nocb_defer_wakeup;          /* Defer wakeup of nocb_kthread. */
 
@@ -472,7 +473,7 @@ struct rcu_state {
        unsigned long gpnum;                    /* Current gp number. */
        unsigned long completed;                /* # of last completed gp. */
        struct task_struct *gp_kthread;         /* Task for grace periods. */
-       wait_queue_head_t gp_wq;                /* Where GP task waits. */
+       struct swait_queue_head gp_wq;          /* Where GP task waits. */
        short gp_flags;                         /* Commands for GP task. */
        short gp_state;                         /* GP kthread sleep state. */
 
@@ -504,7 +505,7 @@ struct rcu_state {
        atomic_long_t expedited_workdone3;      /* # done by others #3. */
        atomic_long_t expedited_normal;         /* # fallbacks to normal. */
        atomic_t expedited_need_qs;             /* # CPUs left to check in. */
-       wait_queue_head_t expedited_wq;         /* Wait for check-ins. */
+       struct swait_queue_head expedited_wq;   /* Wait for check-ins. */
        int ncpus_snap;                         /* # CPUs seen last time. */
 
        unsigned long jiffies_force_qs;         /* Time at which to invoke */
@@ -556,18 +557,18 @@ extern struct list_head rcu_struct_flavors;
  */
 extern struct rcu_state rcu_sched_state;
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 extern struct rcu_state rcu_bh_state;
+#endif
 
 #ifdef CONFIG_PREEMPT_RCU
 extern struct rcu_state rcu_preempt_state;
 #endif /* #ifdef CONFIG_PREEMPT_RCU */
 
-#ifdef CONFIG_RCU_BOOST
 DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_status);
 DECLARE_PER_CPU(int, rcu_cpu_kthread_cpu);
 DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_loops);
 DECLARE_PER_CPU(char, rcu_cpu_has_work);
-#endif /* #ifdef CONFIG_RCU_BOOST */
 
 #ifndef RCU_TREE_NONCORE
 
@@ -587,10 +588,9 @@ void call_rcu(struct rcu_head *head, rcu_callback_t func);
 static void __init __rcu_init_preempt(void);
 static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags);
 static void rcu_preempt_boost_start_gp(struct rcu_node *rnp);
-static void invoke_rcu_callbacks_kthread(void);
 static bool rcu_is_callbacks_kthread(void);
+static void rcu_cpu_kthread_setup(unsigned int cpu);
 #ifdef CONFIG_RCU_BOOST
-static void rcu_preempt_do_callbacks(void);
 static int rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
                                                 struct rcu_node *rnp);
 #endif /* #ifdef CONFIG_RCU_BOOST */
@@ -607,7 +607,8 @@ static void zero_cpu_stall_ticks(struct rcu_data *rdp);
 static void increment_cpu_stall_ticks(void);
 static bool rcu_nocb_cpu_needs_barrier(struct rcu_state *rsp, int cpu);
 static void rcu_nocb_gp_set(struct rcu_node *rnp, int nrq);
-static void rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp);
+static struct swait_queue_head *rcu_nocb_gp_get(struct rcu_node *rnp);
+static void rcu_nocb_gp_cleanup(struct swait_queue_head *sq);
 static void rcu_init_one_nocb(struct rcu_node *rnp);
 static bool __call_rcu_nocb(struct rcu_data *rdp, struct rcu_head *rhp,
                            bool lazy, unsigned long flags);
diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 32cbe72bf545..45e3e3e02a5c 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -24,25 +24,10 @@
  *        Paul E. McKenney <paulmck@linux.vnet.ibm.com>
  */
 
-#include <linux/delay.h>
-#include <linux/gfp.h>
-#include <linux/oom.h>
-#include <linux/smpboot.h>
-#include "../time/tick-internal.h"
-
 #ifdef CONFIG_RCU_BOOST
 
 #include "../locking/rtmutex_common.h"
 
-/*
- * Control variables for per-CPU and per-rcu_node kthreads.  These
- * handle all flavors of RCU.
- */
-static DEFINE_PER_CPU(struct task_struct *, rcu_cpu_kthread_task);
-DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_status);
-DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_loops);
-DEFINE_PER_CPU(char, rcu_cpu_has_work);
-
 #else /* #ifdef CONFIG_RCU_BOOST */
 
 /*
@@ -55,6 +40,14 @@ DEFINE_PER_CPU(char, rcu_cpu_has_work);
 
 #endif /* #else #ifdef CONFIG_RCU_BOOST */
 
+/*
+ * Control variables for per-CPU and per-rcu_node kthreads.  These
+ * handle all flavors of RCU.
+ */
+DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_status);
+DEFINE_PER_CPU(unsigned int, rcu_cpu_kthread_loops);
+DEFINE_PER_CPU(char, rcu_cpu_has_work);
+
 #ifdef CONFIG_RCU_NOCB_CPU
 static cpumask_var_t rcu_nocb_mask; /* CPUs to have callbacks offloaded. */
 static bool have_rcu_nocb_mask;            /* Was rcu_nocb_mask allocated? */
@@ -432,7 +425,7 @@ void rcu_read_unlock_special(struct task_struct *t)
        }
 
        /* Hardware IRQ handlers cannot block, complain if they get here. */
-       if (in_irq() || in_serving_softirq()) {
+       if (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_OFFSET)) {
                lockdep_rcu_suspicious(__FILE__, __LINE__,
                                       "rcu_read_unlock() from irq or softirq with blocking in critical section!!!\n");
                pr_alert("->rcu_read_unlock_special: %#x (b: %d, enq: %d nq: %d)\n",
@@ -645,15 +638,6 @@ static void rcu_preempt_check_callbacks(void)
                t->rcu_read_unlock_special.b.need_qs = true;
 }
 
-#ifdef CONFIG_RCU_BOOST
-
-static void rcu_preempt_do_callbacks(void)
-{
-       rcu_do_batch(rcu_state_p, this_cpu_ptr(rcu_data_p));
-}
-
-#endif /* #ifdef CONFIG_RCU_BOOST */
-
 /*
  * Queue a preemptible-RCU callback for invocation after a grace period.
  */
@@ -930,6 +914,19 @@ void exit_rcu(void)
 
 #endif /* #else #ifdef CONFIG_PREEMPT_RCU */
 
+/*
+ * If boosting, set rcuc kthreads to realtime priority.
+ */
+static void rcu_cpu_kthread_setup(unsigned int cpu)
+{
+#ifdef CONFIG_RCU_BOOST
+       struct sched_param sp;
+
+       sp.sched_priority = kthread_prio;
+       sched_setscheduler_nocheck(current, SCHED_FIFO, &sp);
+#endif /* #ifdef CONFIG_RCU_BOOST */
+}
+
 #ifdef CONFIG_RCU_BOOST
 
 #include "../locking/rtmutex_common.h"
@@ -961,16 +958,6 @@ static void rcu_initiate_boost_trace(struct rcu_node *rnp)
 
 #endif /* #else #ifdef CONFIG_RCU_TRACE */
 
-static void rcu_wake_cond(struct task_struct *t, int status)
-{
-       /*
-        * If the thread is yielding, only wake it when this
-        * is invoked from idle
-        */
-       if (status != RCU_KTHREAD_YIELDING || is_idle_task(current))
-               wake_up_process(t);
-}
-
 /*
  * Carry out RCU priority boosting on the task indicated by ->exp_tasks
  * or ->boost_tasks, advancing the pointer to the next task in the
@@ -1114,23 +1101,6 @@ static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
        }
 }
 
-/*
- * Wake up the per-CPU kthread to invoke RCU callbacks.
- */
-static void invoke_rcu_callbacks_kthread(void)
-{
-       unsigned long flags;
-
-       local_irq_save(flags);
-       __this_cpu_write(rcu_cpu_has_work, 1);
-       if (__this_cpu_read(rcu_cpu_kthread_task) != NULL &&
-           current != __this_cpu_read(rcu_cpu_kthread_task)) {
-               rcu_wake_cond(__this_cpu_read(rcu_cpu_kthread_task),
-                             __this_cpu_read(rcu_cpu_kthread_status));
-       }
-       local_irq_restore(flags);
-}
-
 /*
  * Is the current CPU running the RCU-callbacks kthread?
  * Caller must have preemption disabled.
@@ -1186,67 +1156,6 @@ static int rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
        return 0;
 }
 
-static void rcu_kthread_do_work(void)
-{
-       rcu_do_batch(&rcu_sched_state, this_cpu_ptr(&rcu_sched_data));
-       rcu_do_batch(&rcu_bh_state, this_cpu_ptr(&rcu_bh_data));
-       rcu_preempt_do_callbacks();
-}
-
-static void rcu_cpu_kthread_setup(unsigned int cpu)
-{
-       struct sched_param sp;
-
-       sp.sched_priority = kthread_prio;
-       sched_setscheduler_nocheck(current, SCHED_FIFO, &sp);
-}
-
-static void rcu_cpu_kthread_park(unsigned int cpu)
-{
-       per_cpu(rcu_cpu_kthread_status, cpu) = RCU_KTHREAD_OFFCPU;
-}
-
-static int rcu_cpu_kthread_should_run(unsigned int cpu)
-{
-       return __this_cpu_read(rcu_cpu_has_work);
-}
-
-/*
- * Per-CPU kernel thread that invokes RCU callbacks.  This replaces the
- * RCU softirq used in flavors and configurations of RCU that do not
- * support RCU priority boosting.
- */
-static void rcu_cpu_kthread(unsigned int cpu)
-{
-       unsigned int *statusp = this_cpu_ptr(&rcu_cpu_kthread_status);
-       char work, *workp = this_cpu_ptr(&rcu_cpu_has_work);
-       int spincnt;
-
-       for (spincnt = 0; spincnt < 10; spincnt++) {
-               trace_rcu_utilization(TPS("Start CPU kthread@rcu_wait"));
-               local_bh_disable();
-               *statusp = RCU_KTHREAD_RUNNING;
-               this_cpu_inc(rcu_cpu_kthread_loops);
-               local_irq_disable();
-               work = *workp;
-               *workp = 0;
-               local_irq_enable();
-               if (work)
-                       rcu_kthread_do_work();
-               local_bh_enable();
-               if (*workp == 0) {
-                       trace_rcu_utilization(TPS("End CPU kthread@rcu_wait"));
-                       *statusp = RCU_KTHREAD_WAITING;
-                       return;
-               }
-       }
-       *statusp = RCU_KTHREAD_YIELDING;
-       trace_rcu_utilization(TPS("Start CPU kthread@rcu_yield"));
-       schedule_timeout_interruptible(2);
-       trace_rcu_utilization(TPS("End CPU kthread@rcu_yield"));
-       *statusp = RCU_KTHREAD_WAITING;
-}
-
 /*
  * Set the per-rcu_node kthread's affinity to cover all CPUs that are
  * served by the rcu_node in question.  The CPU hotplug lock is still
@@ -1276,26 +1185,12 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu)
        free_cpumask_var(cm);
 }
 
-static struct smp_hotplug_thread rcu_cpu_thread_spec = {
-       .store                  = &rcu_cpu_kthread_task,
-       .thread_should_run      = rcu_cpu_kthread_should_run,
-       .thread_fn              = rcu_cpu_kthread,
-       .thread_comm            = "rcuc/%u",
-       .setup                  = rcu_cpu_kthread_setup,
-       .park                   = rcu_cpu_kthread_park,
-};
-
 /*
  * Spawn boost kthreads -- called as soon as the scheduler is running.
  */
 static void __init rcu_spawn_boost_kthreads(void)
 {
        struct rcu_node *rnp;
-       int cpu;
-
-       for_each_possible_cpu(cpu)
-               per_cpu(rcu_cpu_has_work, cpu) = 0;
-       BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec));
        rcu_for_each_leaf_node(rcu_state_p, rnp)
                (void)rcu_spawn_one_boost_kthread(rcu_state_p, rnp);
 }
@@ -1318,11 +1213,6 @@ static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
        raw_spin_unlock_irqrestore(&rnp->lock, flags);
 }
 
-static void invoke_rcu_callbacks_kthread(void)
-{
-       WARN_ON_ONCE(1);
-}
-
 static bool rcu_is_callbacks_kthread(void)
 {
        return false;
@@ -1346,7 +1236,7 @@ static void rcu_prepare_kthreads(int cpu)
 
 #endif /* #else #ifdef CONFIG_RCU_BOOST */
 
-#if !defined(CONFIG_RCU_FAST_NO_HZ)
+#if !defined(CONFIG_RCU_FAST_NO_HZ) || defined(CONFIG_PREEMPT_RT_FULL)
 
 /*
  * Check to see if any future RCU-related work will need to be done
@@ -1363,7 +1253,9 @@ int rcu_needs_cpu(u64 basemono, u64 *nextevt)
        return IS_ENABLED(CONFIG_RCU_NOCB_CPU_ALL)
               ? 0 : rcu_cpu_has_callbacks(NULL);
 }
+#endif /* !defined(CONFIG_RCU_FAST_NO_HZ) || defined(CONFIG_PREEMPT_RT_FULL) */
 
+#if !defined(CONFIG_RCU_FAST_NO_HZ)
 /*
  * Because we do not have RCU_FAST_NO_HZ, don't bother cleaning up
  * after it.
@@ -1459,6 +1351,8 @@ static bool __maybe_unused rcu_try_advance_all_cbs(void)
        return cbs_ready;
 }
 
+#ifndef CONFIG_PREEMPT_RT_FULL
+
 /*
  * Allow the CPU to enter dyntick-idle mode unless it has callbacks ready
  * to invoke.  If the CPU has callbacks, try to advance them.  Tell the
@@ -1504,6 +1398,7 @@ int rcu_needs_cpu(u64 basemono, u64 *nextevt)
        *nextevt = basemono + dj * TICK_NSEC;
        return 0;
 }
+#endif /* #ifndef CONFIG_PREEMPT_RT_FULL */
 
 /*
  * Prepare a CPU for idle from an RCU perspective.  The first major task
@@ -1822,9 +1717,9 @@ early_param("rcu_nocb_poll", parse_rcu_nocb_poll);
  * Wake up any no-CBs CPUs' kthreads that were waiting on the just-ended
  * grace period.
  */
-static void rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp)
+static void rcu_nocb_gp_cleanup(struct swait_queue_head *sq)
 {
-       wake_up_all(&rnp->nocb_gp_wq[rnp->completed & 0x1]);
+       swake_up_all(sq);
 }
 
 /*
@@ -1840,10 +1735,15 @@ static void rcu_nocb_gp_set(struct rcu_node *rnp, int nrq)
        rnp->need_future_gp[(rnp->completed + 1) & 0x1] += nrq;
 }
 
+static struct swait_queue_head *rcu_nocb_gp_get(struct rcu_node *rnp)
+{
+       return &rnp->nocb_gp_wq[rnp->completed & 0x1];
+}
+
 static void rcu_init_one_nocb(struct rcu_node *rnp)
 {
-       init_waitqueue_head(&rnp->nocb_gp_wq[0]);
-       init_waitqueue_head(&rnp->nocb_gp_wq[1]);
+       init_swait_queue_head(&rnp->nocb_gp_wq[0]);
+       init_swait_queue_head(&rnp->nocb_gp_wq[1]);
 }
 
 #ifndef CONFIG_RCU_NOCB_CPU_ALL
@@ -1868,7 +1768,7 @@ static void wake_nocb_leader(struct rcu_data *rdp, bool force)
        if (READ_ONCE(rdp_leader->nocb_leader_sleep) || force) {
                /* Prior smp_mb__after_atomic() orders against prior enqueue. */
                WRITE_ONCE(rdp_leader->nocb_leader_sleep, false);
-               wake_up(&rdp_leader->nocb_wq);
+               swake_up(&rdp_leader->nocb_wq);
        }
 }
 
@@ -2081,7 +1981,7 @@ static void rcu_nocb_wait_gp(struct rcu_data *rdp)
         */
        trace_rcu_future_gp(rnp, rdp, c, TPS("StartWait"));
        for (;;) {
-               wait_event_interruptible(
+               swait_event_interruptible(
                        rnp->nocb_gp_wq[c & 0x1],
                        (d = ULONG_CMP_GE(READ_ONCE(rnp->completed), c)));
                if (likely(d))
@@ -2109,7 +2009,7 @@ static void nocb_leader_wait(struct rcu_data *my_rdp)
        /* Wait for callbacks to appear. */
        if (!rcu_nocb_poll) {
                trace_rcu_nocb_wake(my_rdp->rsp->name, my_rdp->cpu, "Sleep");
-               wait_event_interruptible(my_rdp->nocb_wq,
+               swait_event_interruptible(my_rdp->nocb_wq,
                                !READ_ONCE(my_rdp->nocb_leader_sleep));
                /* Memory barrier handled by smp_mb() calls below and repoll. */
        } else if (firsttime) {
@@ -2184,7 +2084,7 @@ static void nocb_leader_wait(struct rcu_data *my_rdp)
                         * List was empty, wake up the follower.
                         * Memory barriers supplied by atomic_long_add().
                         */
-                       wake_up(&rdp->nocb_wq);
+                       swake_up(&rdp->nocb_wq);
                }
        }
 
@@ -2205,7 +2105,7 @@ static void nocb_follower_wait(struct rcu_data *rdp)
                if (!rcu_nocb_poll) {
                        trace_rcu_nocb_wake(rdp->rsp->name, rdp->cpu,
                                            "FollowerSleep");
-                       wait_event_interruptible(rdp->nocb_wq,
+                       swait_event_interruptible(rdp->nocb_wq,
                                                 READ_ONCE(rdp->nocb_follower_head));
                } else if (firsttime) {
                        /* Don't drown trace log with "Poll"! */
@@ -2365,7 +2265,7 @@ void __init rcu_init_nohz(void)
 static void __init rcu_boot_init_nocb_percpu_data(struct rcu_data *rdp)
 {
        rdp->nocb_tail = &rdp->nocb_head;
-       init_waitqueue_head(&rdp->nocb_wq);
+       init_swait_queue_head(&rdp->nocb_wq);
        rdp->nocb_follower_tail = &rdp->nocb_follower_head;
 }
 
@@ -2515,7 +2415,7 @@ static bool rcu_nocb_cpu_needs_barrier(struct rcu_state *rsp, int cpu)
        return false;
 }
 
-static void rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp)
+static void rcu_nocb_gp_cleanup(struct swait_queue_head *sq)
 {
 }
 
@@ -2523,6 +2423,11 @@ static void rcu_nocb_gp_set(struct rcu_node *rnp, int nrq)
 {
 }
 
+static struct swait_queue_head *rcu_nocb_gp_get(struct rcu_node *rnp)
+{
+       return NULL;
+}
+
 static void rcu_init_one_nocb(struct rcu_node *rnp)
 {
 }
diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
index 5f748c5a40f0..9a3904603ff6 100644
--- a/kernel/rcu/update.c
+++ b/kernel/rcu/update.c
@@ -276,6 +276,7 @@ int rcu_read_lock_held(void)
 }
 EXPORT_SYMBOL_GPL(rcu_read_lock_held);
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 /**
  * rcu_read_lock_bh_held() - might we be in RCU-bh read-side critical section?
  *
@@ -302,6 +303,7 @@ int rcu_read_lock_bh_held(void)
        return in_softirq() || irqs_disabled();
 }
 EXPORT_SYMBOL_GPL(rcu_read_lock_bh_held);
+#endif
 
 #endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */
 
diff --git a/kernel/relay.c b/kernel/relay.c
index 0b4570cfacae..60684be39f22 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -336,6 +336,10 @@ static void wakeup_readers(unsigned long data)
 {
        struct rchan_buf *buf = (struct rchan_buf *)data;
        wake_up_interruptible(&buf->read_wait);
+       /*
+        * Stupid polling for now:
+        */
+       mod_timer(&buf->timer, jiffies + 1);
 }
 
 /**
@@ -353,6 +357,7 @@ static void __relay_reset(struct rchan_buf *buf, unsigned int init)
                init_waitqueue_head(&buf->read_wait);
                kref_init(&buf->kref);
                setup_timer(&buf->timer, wakeup_readers, (unsigned long)buf);
+               mod_timer(&buf->timer, jiffies + 1);
        } else
                del_timer_sync(&buf->timer);
 
@@ -736,15 +741,6 @@ size_t relay_switch_subbuf(struct rchan_buf *buf, size_t length)
                else
                        buf->early_bytes += buf->chan->subbuf_size -
                                            buf->padding[old_subbuf];
-               smp_mb();
-               if (waitqueue_active(&buf->read_wait))
-                       /*
-                        * Calling wake_up_interruptible() from here
-                        * will deadlock if we happen to be logging
-                        * from the scheduler (trying to re-grab
-                        * rq->lock), so defer it.
-                        */
-                       mod_timer(&buf->timer, jiffies + 1);
        }
 
        old = buf->data;
diff --git a/kernel/sched/Makefile b/kernel/sched/Makefile
index 67687973ce80..01b9994b367a 100644
--- a/kernel/sched/Makefile
+++ b/kernel/sched/Makefile
@@ -13,7 +13,7 @@ endif
 
 obj-y += core.o loadavg.o clock.o cputime.o
 obj-y += idle_task.o fair.o rt.o deadline.o stop_task.o
-obj-y += wait.o completion.o idle.o
+obj-y += wait.o swait.o swork.o completion.o idle.o
 obj-$(CONFIG_SMP) += cpupri.o cpudeadline.o
 obj-$(CONFIG_SCHED_AUTOGROUP) += auto_group.o
 obj-$(CONFIG_SCHEDSTATS) += stats.o
diff --git a/kernel/sched/completion.c b/kernel/sched/completion.c
index 8d0f35debf35..b62cf6400fe0 100644
--- a/kernel/sched/completion.c
+++ b/kernel/sched/completion.c
@@ -30,10 +30,10 @@ void complete(struct completion *x)
 {
        unsigned long flags;
 
-       spin_lock_irqsave(&x->wait.lock, flags);
+       raw_spin_lock_irqsave(&x->wait.lock, flags);
        x->done++;
-       __wake_up_locked(&x->wait, TASK_NORMAL, 1);
-       spin_unlock_irqrestore(&x->wait.lock, flags);
+       swake_up_locked(&x->wait);
+       raw_spin_unlock_irqrestore(&x->wait.lock, flags);
 }
 EXPORT_SYMBOL(complete);
 
@@ -50,10 +50,10 @@ void complete_all(struct completion *x)
 {
        unsigned long flags;
 
-       spin_lock_irqsave(&x->wait.lock, flags);
+       raw_spin_lock_irqsave(&x->wait.lock, flags);
        x->done += UINT_MAX/2;
-       __wake_up_locked(&x->wait, TASK_NORMAL, 0);
-       spin_unlock_irqrestore(&x->wait.lock, flags);
+       swake_up_all_locked(&x->wait);
+       raw_spin_unlock_irqrestore(&x->wait.lock, flags);
 }
 EXPORT_SYMBOL(complete_all);
 
@@ -62,20 +62,20 @@ do_wait_for_common(struct completion *x,
                   long (*action)(long), long timeout, int state)
 {
        if (!x->done) {
-               DECLARE_WAITQUEUE(wait, current);
+               DECLARE_SWAITQUEUE(wait);
 
-               __add_wait_queue_tail_exclusive(&x->wait, &wait);
+               __prepare_to_swait(&x->wait, &wait);
                do {
                        if (signal_pending_state(state, current)) {
                                timeout = -ERESTARTSYS;
                                break;
                        }
                        __set_current_state(state);
-                       spin_unlock_irq(&x->wait.lock);
+                       raw_spin_unlock_irq(&x->wait.lock);
                        timeout = action(timeout);
-                       spin_lock_irq(&x->wait.lock);
+                       raw_spin_lock_irq(&x->wait.lock);
                } while (!x->done && timeout);
-               __remove_wait_queue(&x->wait, &wait);
+               __finish_swait(&x->wait, &wait);
                if (!x->done)
                        return timeout;
        }
@@ -89,9 +89,9 @@ __wait_for_common(struct completion *x,
 {
        might_sleep();
 
-       spin_lock_irq(&x->wait.lock);
+       raw_spin_lock_irq(&x->wait.lock);
        timeout = do_wait_for_common(x, action, timeout, state);
-       spin_unlock_irq(&x->wait.lock);
+       raw_spin_unlock_irq(&x->wait.lock);
        return timeout;
 }
 
@@ -277,12 +277,12 @@ bool try_wait_for_completion(struct completion *x)
        if (!READ_ONCE(x->done))
                return 0;
 
-       spin_lock_irqsave(&x->wait.lock, flags);
+       raw_spin_lock_irqsave(&x->wait.lock, flags);
        if (!x->done)
                ret = 0;
        else
                x->done--;
-       spin_unlock_irqrestore(&x->wait.lock, flags);
+       raw_spin_unlock_irqrestore(&x->wait.lock, flags);
        return ret;
 }
 EXPORT_SYMBOL(try_wait_for_completion);
@@ -311,7 +311,7 @@ bool completion_done(struct completion *x)
         * after it's acquired the lock.
         */
        smp_rmb();
-       spin_unlock_wait(&x->wait.lock);
+       raw_spin_unlock_wait(&x->wait.lock);
        return true;
 }
 EXPORT_SYMBOL(completion_done);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9d6b3d869592..3e2e4c3de066 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -260,7 +260,11 @@ late_initcall(sched_init_debug);
  * Number of tasks to iterate in a single balance run.
  * Limited because this is done with IRQs disabled.
  */
+#ifndef CONFIG_PREEMPT_RT_FULL
 const_debug unsigned int sysctl_sched_nr_migrate = 32;
+#else
+const_debug unsigned int sysctl_sched_nr_migrate = 8;
+#endif
 
 /*
  * period over which we average the RT time consumption, measured
@@ -438,6 +442,7 @@ static void init_rq_hrtick(struct rq *rq)
 
        hrtimer_init(&rq->hrtick_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
        rq->hrtick_timer.function = hrtick;
+       rq->hrtick_timer.irqsafe = 1;
 }
 #else  /* CONFIG_SCHED_HRTICK */
 static inline void hrtick_clear(struct rq *rq)
@@ -518,9 +523,15 @@ static bool set_nr_if_polling(struct task_struct *p)
 #endif
 #endif
 
-void wake_q_add(struct wake_q_head *head, struct task_struct *task)
+void __wake_q_add(struct wake_q_head *head, struct task_struct *task,
+                 bool sleeper)
 {
-       struct wake_q_node *node = &task->wake_q;
+       struct wake_q_node *node;
+
+       if (sleeper)
+               node = &task->wake_q_sleeper;
+       else
+               node = &task->wake_q;
 
        /*
         * Atomically grab the task, if ->wake_q is !nil already it means
@@ -542,24 +553,33 @@ void wake_q_add(struct wake_q_head *head, struct task_struct *task)
        head->lastp = &node->next;
 }
 
-void wake_up_q(struct wake_q_head *head)
+void __wake_up_q(struct wake_q_head *head, bool sleeper)
 {
        struct wake_q_node *node = head->first;
 
        while (node != WAKE_Q_TAIL) {
                struct task_struct *task;
 
-               task = container_of(node, struct task_struct, wake_q);
+               if (sleeper)
+                       task = container_of(node, struct task_struct, wake_q_sleeper);
+               else
+                       task = container_of(node, struct task_struct, wake_q);
                BUG_ON(!task);
                /* task can safely be re-inserted now */
                node = node->next;
-               task->wake_q.next = NULL;
+               if (sleeper)
+                       task->wake_q_sleeper.next = NULL;
+               else
+                       task->wake_q.next = NULL;
 
                /*
                 * wake_up_process() implies a wmb() to pair with the queueing
                 * in wake_q_add() so as not to miss wakeups.
                 */
-               wake_up_process(task);
+               if (sleeper)
+                       wake_up_lock_sleeper(task);
+               else
+                       wake_up_process(task);
                put_task_struct(task);
        }
 }
@@ -595,6 +615,38 @@ void resched_curr(struct rq *rq)
                trace_sched_wake_idle_without_ipi(cpu);
 }
 
+#ifdef CONFIG_PREEMPT_LAZY
+void resched_curr_lazy(struct rq *rq)
+{
+       struct task_struct *curr = rq->curr;
+       int cpu;
+
+       if (!sched_feat(PREEMPT_LAZY)) {
+               resched_curr(rq);
+               return;
+       }
+
+       lockdep_assert_held(&rq->lock);
+
+       if (test_tsk_need_resched(curr))
+               return;
+
+       if (test_tsk_need_resched_lazy(curr))
+               return;
+
+       set_tsk_need_resched_lazy(curr);
+
+       cpu = cpu_of(rq);
+       if (cpu == smp_processor_id())
+               return;
+
+       /* NEED_RESCHED_LAZY must be visible before we test polling */
+       smp_mb();
+       if (!tsk_is_polling(curr))
+               smp_send_reschedule(cpu);
+}
+#endif
+
 void resched_cpu(int cpu)
 {
        struct rq *rq = cpu_rq(cpu);
@@ -617,11 +669,14 @@ void resched_cpu(int cpu)
  */
 int get_nohz_timer_target(void)
 {
-       int i, cpu = smp_processor_id();
+       int i, cpu;
        struct sched_domain *sd;
 
+       preempt_disable_rt();
+       cpu = smp_processor_id();
+
        if (!idle_cpu(cpu) && is_housekeeping_cpu(cpu))
-               return cpu;
+               goto preempt_en_rt;
 
        rcu_read_lock();
        for_each_domain(cpu, sd) {
@@ -640,6 +695,8 @@ int get_nohz_timer_target(void)
                cpu = housekeeping_any_cpu();
 unlock:
        rcu_read_unlock();
+preempt_en_rt:
+       preempt_enable_rt();
        return cpu;
 }
 /*
@@ -1166,7 +1223,8 @@ void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_ma
        p->nr_cpus_allowed = cpumask_weight(new_mask);
 }
 
-void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
+static void __do_set_cpus_allowed_tail(struct task_struct *p,
+                                      const struct cpumask *new_mask)
 {
        struct rq *rq = task_rq(p);
        bool queued, running;
@@ -1195,6 +1253,98 @@ void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
                enqueue_task(rq, p, ENQUEUE_RESTORE);
 }
 
+void do_set_cpus_allowed(struct task_struct *p, const struct cpumask *new_mask)
+{
+       if (__migrate_disabled(p)) {
+               lockdep_assert_held(&p->pi_lock);
+
+               cpumask_copy(&p->cpus_allowed, new_mask);
+#if defined(CONFIG_PREEMPT_RT_FULL) && defined(CONFIG_SMP)
+               p->migrate_disable_update = 1;
+#endif
+               return;
+       }
+       __do_set_cpus_allowed_tail(p, new_mask);
+}
+
+static DEFINE_PER_CPU(struct cpumask, sched_cpumasks);
+static DEFINE_MUTEX(sched_down_mutex);
+static cpumask_t sched_down_cpumask;
+
+void tell_sched_cpu_down_begin(int cpu)
+{
+       mutex_lock(&sched_down_mutex);
+       cpumask_set_cpu(cpu, &sched_down_cpumask);
+       mutex_unlock(&sched_down_mutex);
+}
+
+void tell_sched_cpu_down_done(int cpu)
+{
+       mutex_lock(&sched_down_mutex);
+       cpumask_clear_cpu(cpu, &sched_down_cpumask);
+       mutex_unlock(&sched_down_mutex);
+}
+
+/**
+ * migrate_me - try to move the current task off this cpu
+ *
+ * Used by the pin_current_cpu() code to try to get tasks
+ * to move off the current CPU as it is going down.
+ * It will only move the task if the task isn't pinned to
+ * the CPU (with migrate_disable, affinity or NO_SETAFFINITY)
+ * and the task has to be in a RUNNING state. Otherwise the
+ * movement of the task will wake it up (change its state
+ * to running) when the task did not expect it.
+ *
+ * Returns 1 if it succeeded in moving the current task
+ *         0 otherwise.
+ */
+int migrate_me(void)
+{
+       struct task_struct *p = current;
+       struct migration_arg arg;
+       struct cpumask *cpumask;
+       struct cpumask *mask;
+       unsigned long flags;
+       unsigned int dest_cpu;
+       struct rq *rq;
+
+       /*
+        * We can not migrate tasks bounded to a CPU or tasks not
+        * running. The movement of the task will wake it up.
+        */
+       if (p->flags & PF_NO_SETAFFINITY || p->state)
+               return 0;
+
+       mutex_lock(&sched_down_mutex);
+       rq = task_rq_lock(p, &flags);
+
+       cpumask = this_cpu_ptr(&sched_cpumasks);
+       mask = &p->cpus_allowed;
+
+       cpumask_andnot(cpumask, mask, &sched_down_cpumask);
+
+       if (!cpumask_weight(cpumask)) {
+               /* It's only on this CPU? */
+               task_rq_unlock(rq, p, &flags);
+               mutex_unlock(&sched_down_mutex);
+               return 0;
+       }
+
+       dest_cpu = cpumask_any_and(cpu_active_mask, cpumask);
+
+       arg.task = p;
+       arg.dest_cpu = dest_cpu;
+
+       task_rq_unlock(rq, p, &flags);
+
+       stop_one_cpu(cpu_of(rq), migration_cpu_stop, &arg);
+       tlb_migrate_finish(p->mm);
+       mutex_unlock(&sched_down_mutex);
+
+       return 1;
+}
+
 /*
  * Change a given task's CPU affinity. Migrate the thread to a
  * proper CPU and schedule it away if the CPU it's executing on
@@ -1234,7 +1384,7 @@ static int __set_cpus_allowed_ptr(struct task_struct *p,
        do_set_cpus_allowed(p, new_mask);
 
        /* Can the task run on the task's current CPU? If so, we're done */
-       if (cpumask_test_cpu(task_cpu(p), new_mask))
+       if (cpumask_test_cpu(task_cpu(p), new_mask) || __migrate_disabled(p))
                goto out;
 
        dest_cpu = cpumask_any_and(cpu_active_mask, new_mask);
@@ -1410,6 +1560,18 @@ int migrate_swap(struct task_struct *cur, struct task_struct *p)
        return ret;
 }
 
+static bool check_task_state(struct task_struct *p, long match_state)
+{
+       bool match = false;
+
+       raw_spin_lock_irq(&p->pi_lock);
+       if (p->state == match_state || p->saved_state == match_state)
+               match = true;
+       raw_spin_unlock_irq(&p->pi_lock);
+
+       return match;
+}
+
 /*
  * wait_task_inactive - wait for a thread to unschedule.
  *
@@ -1454,7 +1616,7 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state)
                 * is actually now running somewhere else!
                 */
                while (task_running(rq, p)) {
-                       if (match_state && unlikely(p->state != match_state))
+                       if (match_state && !check_task_state(p, match_state))
                                return 0;
                        cpu_relax();
                }
@@ -1469,7 +1631,8 @@ unsigned long wait_task_inactive(struct task_struct *p, long match_state)
                running = task_running(rq, p);
                queued = task_on_rq_queued(p);
                ncsw = 0;
-               if (!match_state || p->state == match_state)
+               if (!match_state || p->state == match_state ||
+                   p->saved_state == match_state)
                        ncsw = p->nvcsw | LONG_MIN; /* sets MSB */
                task_rq_unlock(rq, p, &flags);
 
@@ -1626,7 +1789,7 @@ int select_task_rq(struct task_struct *p, int cpu, int sd_flags, int wake_flags)
 {
        lockdep_assert_held(&p->pi_lock);
 
-       if (p->nr_cpus_allowed > 1)
+       if (tsk_nr_cpus_allowed(p) > 1)
                cpu = p->sched_class->select_task_rq(p, cpu, sd_flags, wake_flags);
 
        /*
@@ -1706,10 +1869,6 @@ static inline void ttwu_activate(struct rq *rq, struct task_struct *p, int en_fl
 {
        activate_task(rq, p, en_flags);
        p->on_rq = TASK_ON_RQ_QUEUED;
-
-       /* if a worker is waking up, notify workqueue */
-       if (p->flags & PF_WQ_WORKER)
-               wq_worker_waking_up(p, cpu_of(rq));
 }
 
 /*
@@ -1936,8 +2095,27 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
         */
        smp_mb__before_spinlock();
        raw_spin_lock_irqsave(&p->pi_lock, flags);
-       if (!(p->state & state))
+       if (!(p->state & state)) {
+               /*
+                * The task might be running due to a spinlock sleeper
+                * wakeup. Check the saved state and set it to running
+                * if the wakeup condition is true.
+                */
+               if (!(wake_flags & WF_LOCK_SLEEPER)) {
+                       if (p->saved_state & state) {
+                               p->saved_state = TASK_RUNNING;
+                               success = 1;
+                       }
+               }
                goto out;
+       }
+
+       /*
+        * If this is a regular wakeup, then we can unconditionally
+        * clear the saved state of a "lock sleeper".
+        */
+       if (!(wake_flags & WF_LOCK_SLEEPER))
+               p->saved_state = TASK_RUNNING;
 
        trace_sched_waking(p);
 
@@ -2028,52 +2206,6 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
        return success;
 }
 
-/**
- * try_to_wake_up_local - try to wake up a local task with rq lock held
- * @p: the thread to be awakened
- *
- * Put @p on the run-queue if it's not already there. The caller must
- * ensure that this_rq() is locked, @p is bound to this_rq() and not
- * the current task.
- */
-static void try_to_wake_up_local(struct task_struct *p)
-{
-       struct rq *rq = task_rq(p);
-
-       if (WARN_ON_ONCE(rq != this_rq()) ||
-           WARN_ON_ONCE(p == current))
-               return;
-
-       lockdep_assert_held(&rq->lock);
-
-       if (!raw_spin_trylock(&p->pi_lock)) {
-               /*
-                * This is OK, because current is on_cpu, which avoids it being
-                * picked for load-balance and preemption/IRQs are still
-                * disabled avoiding further scheduler activity on it and we've
-                * not yet picked a replacement task.
-                */
-               lockdep_unpin_lock(&rq->lock);
-               raw_spin_unlock(&rq->lock);
-               raw_spin_lock(&p->pi_lock);
-               raw_spin_lock(&rq->lock);
-               lockdep_pin_lock(&rq->lock);
-       }
-
-       if (!(p->state & TASK_NORMAL))
-               goto out;
-
-       trace_sched_waking(p);
-
-       if (!task_on_rq_queued(p))
-               ttwu_activate(rq, p, ENQUEUE_WAKEUP);
-
-       ttwu_do_wakeup(rq, p, 0);
-       ttwu_stat(p, smp_processor_id(), 0);
-out:
-       raw_spin_unlock(&p->pi_lock);
-}
-
 /**
  * wake_up_process - Wake up a specific process
  * @p: The process to be woken up.
@@ -2092,6 +2224,18 @@ int wake_up_process(struct task_struct *p)
 }
 EXPORT_SYMBOL(wake_up_process);
 
+/**
+ * wake_up_lock_sleeper - Wake up a specific process blocked on a "sleeping lock"
+ * @p: The process to be woken up.
+ *
+ * Same as wake_up_process() above, but wake_flags=WF_LOCK_SLEEPER to indicate
+ * the nature of the wakeup.
+ */
+int wake_up_lock_sleeper(struct task_struct *p)
+{
+       return try_to_wake_up(p, TASK_UNINTERRUPTIBLE, WF_LOCK_SLEEPER);
+}
+
 int wake_up_state(struct task_struct *p, unsigned int state)
 {
        return try_to_wake_up(p, state, 0);
@@ -2278,6 +2422,9 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p)
        p->on_cpu = 0;
 #endif
        init_task_preempt_count(p);
+#ifdef CONFIG_HAVE_PREEMPT_LAZY
+       task_thread_info(p)->preempt_lazy_count = 0;
+#endif
 #ifdef CONFIG_SMP
        plist_node_init(&p->pushable_tasks, MAX_PRIO);
        RB_CLEAR_NODE(&p->pushable_dl_tasks);
@@ -2602,8 +2749,12 @@ static struct rq *finish_task_switch(struct task_struct *prev)
        finish_arch_post_lock_switch();
 
        fire_sched_in_preempt_notifiers(current);
+       /*
+        * We use mmdrop_delayed() here so we don't have to do the
+        * full __mmdrop() when we are the last user.
+        */
        if (mm)
-               mmdrop(mm);
+               mmdrop_delayed(mm);
        if (unlikely(prev_state == TASK_DEAD)) {
                if (prev->sched_class->task_dead)
                        prev->sched_class->task_dead(prev);
@@ -2934,16 +3085,6 @@ u64 scheduler_tick_max_deferment(void)
 }
 #endif
 
-notrace unsigned long get_parent_ip(unsigned long addr)
-{
-       if (in_lock_functions(addr)) {
-               addr = CALLER_ADDR2;
-               if (in_lock_functions(addr))
-                       addr = CALLER_ADDR3;
-       }
-       return addr;
-}
-
 #if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \
                                defined(CONFIG_PREEMPT_TRACER))
 
@@ -2965,7 +3106,7 @@ void preempt_count_add(int val)
                                PREEMPT_MASK - 10);
 #endif
        if (preempt_count() == val) {
-               unsigned long ip = get_parent_ip(CALLER_ADDR1);
+               unsigned long ip = get_lock_parent_ip();
 #ifdef CONFIG_DEBUG_PREEMPT
                current->preempt_disable_ip = ip;
 #endif
@@ -2992,7 +3133,7 @@ void preempt_count_sub(int val)
 #endif
 
        if (preempt_count() == val)
-               trace_preempt_on(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
+               trace_preempt_on(CALLER_ADDR0, get_lock_parent_ip());
        __preempt_count_sub(val);
 }
 EXPORT_SYMBOL(preempt_count_sub);
@@ -3047,6 +3188,114 @@ static inline void schedule_debug(struct task_struct *prev)
        schedstat_inc(this_rq(), sched_count);
 }
 
+#if defined(CONFIG_PREEMPT_RT_FULL) && defined(CONFIG_SMP)
+
+void migrate_disable(void)
+{
+       struct task_struct *p = current;
+
+       if (in_atomic() || irqs_disabled()) {
+#ifdef CONFIG_SCHED_DEBUG
+               p->migrate_disable_atomic++;
+#endif
+               return;
+       }
+
+#ifdef CONFIG_SCHED_DEBUG
+       if (unlikely(p->migrate_disable_atomic)) {
+               tracing_off();
+               WARN_ON_ONCE(1);
+       }
+#endif
+
+       if (p->migrate_disable) {
+               p->migrate_disable++;
+               return;
+       }
+
+       preempt_disable();
+       preempt_lazy_disable();
+       pin_current_cpu();
+       p->migrate_disable = 1;
+       preempt_enable();
+}
+EXPORT_SYMBOL(migrate_disable);
+
+void migrate_enable(void)
+{
+       struct task_struct *p = current;
+
+       if (in_atomic() || irqs_disabled()) {
+#ifdef CONFIG_SCHED_DEBUG
+               p->migrate_disable_atomic--;
+#endif
+               return;
+       }
+
+#ifdef CONFIG_SCHED_DEBUG
+       if (unlikely(p->migrate_disable_atomic)) {
+               tracing_off();
+               WARN_ON_ONCE(1);
+       }
+#endif
+       WARN_ON_ONCE(p->migrate_disable <= 0);
+
+       if (p->migrate_disable > 1) {
+               p->migrate_disable--;
+               return;
+       }
+
+       preempt_disable();
+       /*
+        * Clearing migrate_disable causes tsk_cpus_allowed to
+        * show the tasks original cpu affinity.
+        */
+       p->migrate_disable = 0;
+
+       if (p->migrate_disable_update) {
+               unsigned long flags;
+               struct rq *rq;
+
+               rq = task_rq_lock(p, &flags);
+               update_rq_clock(rq);
+
+               __do_set_cpus_allowed_tail(p, &p->cpus_allowed);
+               task_rq_unlock(rq, p, &flags);
+
+               p->migrate_disable_update = 0;
+
+               WARN_ON(smp_processor_id() != task_cpu(p));
+               if (!cpumask_test_cpu(task_cpu(p), &p->cpus_allowed)) {
+                       const struct cpumask *cpu_valid_mask = cpu_active_mask;
+                       struct migration_arg arg;
+                       unsigned int dest_cpu;
+
+                       if (p->flags & PF_KTHREAD) {
+                               /*
+                                * Kernel threads are allowed on online && !active CPUs
+                                */
+                               cpu_valid_mask = cpu_online_mask;
+                       }
+                       dest_cpu = cpumask_any_and(cpu_valid_mask, &p->cpus_allowed);
+                       arg.task = p;
+                       arg.dest_cpu = dest_cpu;
+
+                       unpin_current_cpu();
+                       preempt_lazy_enable();
+                       preempt_enable();
+                       stop_one_cpu(task_cpu(p), migration_cpu_stop, &arg);
+                       tlb_migrate_finish(p->mm);
+                       return;
+               }
+       }
+
+       unpin_current_cpu();
+       preempt_enable();
+       preempt_lazy_enable();
+}
+EXPORT_SYMBOL(migrate_enable);
+#endif
+
 /*
  * Pick up the highest-prio task:
  */
@@ -3171,19 +3420,6 @@ static void __sched notrace __schedule(bool preempt)
                } else {
                        deactivate_task(rq, prev, DEQUEUE_SLEEP);
                        prev->on_rq = 0;
-
-                       /*
-                        * If a worker went to sleep, notify and ask workqueue
-                        * whether it wants to wake up a task to maintain
-                        * concurrency.
-                        */
-                       if (prev->flags & PF_WQ_WORKER) {
-                               struct task_struct *to_wakeup;
-
-                               to_wakeup = wq_worker_sleeping(prev, cpu);
-                               if (to_wakeup)
-                                       try_to_wake_up_local(to_wakeup);
-                       }
                }
                switch_count = &prev->nvcsw;
        }
@@ -3193,6 +3429,7 @@ static void __sched notrace __schedule(bool preempt)
 
        next = pick_next_task(rq, prev);
        clear_tsk_need_resched(prev);
+       clear_tsk_need_resched_lazy(prev);
        clear_preempt_need_resched();
        rq->clock_skip_update = 0;
 
@@ -3214,8 +3451,19 @@ static void __sched notrace __schedule(bool preempt)
 
 static inline void sched_submit_work(struct task_struct *tsk)
 {
-       if (!tsk->state || tsk_is_pi_blocked(tsk))
+       if (!tsk->state)
                return;
+       /*
+        * If a worker went to sleep, notify and ask workqueue whether
+        * it wants to wake up a task to maintain concurrency.
+        */
+       if (tsk->flags & PF_WQ_WORKER)
+               wq_worker_sleeping(tsk);
+
+
+       if (tsk_is_pi_blocked(tsk))
+               return;
+
        /*
         * If we are going to sleep and we have plugged IO queued,
         * make sure to submit it to avoid deadlocks.
@@ -3224,6 +3472,12 @@ static inline void sched_submit_work(struct task_struct *tsk)
                blk_schedule_flush_plug(tsk);
 }
 
+static void sched_update_worker(struct task_struct *tsk)
+{
+       if (tsk->flags & PF_WQ_WORKER)
+               wq_worker_running(tsk);
+}
+
 asmlinkage __visible void __sched schedule(void)
 {
        struct task_struct *tsk = current;
@@ -3234,6 +3488,7 @@ asmlinkage __visible void __sched schedule(void)
                __schedule(false);
                sched_preempt_enable_no_resched();
        } while (need_resched());
+       sched_update_worker(tsk);
 }
 EXPORT_SYMBOL(schedule);
 
@@ -3282,6 +3537,30 @@ static void __sched notrace preempt_schedule_common(void)
        } while (need_resched());
 }
 
+#ifdef CONFIG_PREEMPT_LAZY
+/*
+ * If TIF_NEED_RESCHED is then we allow to be scheduled away since this is
+ * set by a RT task. Oterwise we try to avoid beeing scheduled out as long as
+ * preempt_lazy_count counter >0.
+ */
+static __always_inline int preemptible_lazy(void)
+{
+       if (test_thread_flag(TIF_NEED_RESCHED))
+               return 1;
+       if (current_thread_info()->preempt_lazy_count)
+               return 0;
+       return 1;
+}
+
+#else
+
+static inline int preemptible_lazy(void)
+{
+       return 1;
+}
+
+#endif
+
 #ifdef CONFIG_PREEMPT
 /*
  * this is the entry point to schedule() from in-kernel preemption
@@ -3296,6 +3575,8 @@ asmlinkage __visible void __sched notrace preempt_schedule(void)
         */
        if (likely(!preemptible()))
                return;
+       if (!preemptible_lazy())
+               return;
 
        preempt_schedule_common();
 }
@@ -3322,6 +3603,8 @@ asmlinkage __visible void __sched notrace preempt_schedule_notrace(void)
 
        if (likely(!preemptible()))
                return;
+       if (!preemptible_lazy())
+               return;
 
        do {
                preempt_disable_notrace();
@@ -3331,7 +3614,16 @@ asmlinkage __visible void __sched notrace preempt_schedule_notrace(void)
                 * an infinite recursion.
                 */
                prev_ctx = exception_enter();
+               /*
+                * The add/subtract must not be traced by the function
+                * tracer. But we still want to account for the
+                * preempt off latency tracer. Since the _notrace versions
+                * of add/subtract skip the accounting for latency tracer
+                * we must force it manually.
+                */
+               start_critical_timings();
                __schedule(true);
+               stop_critical_timings();
                exception_exit(prev_ctx);
 
                preempt_enable_no_resched_notrace();
@@ -4675,6 +4967,7 @@ int __cond_resched_lock(spinlock_t *lock)
 }
 EXPORT_SYMBOL(__cond_resched_lock);
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 int __sched __cond_resched_softirq(void)
 {
        BUG_ON(!in_softirq());
@@ -4688,6 +4981,7 @@ int __sched __cond_resched_softirq(void)
        return 0;
 }
 EXPORT_SYMBOL(__cond_resched_softirq);
+#endif
 
 /**
  * yield - yield the current processor to other threads.
@@ -5054,7 +5348,9 @@ void init_idle(struct task_struct *idle, int cpu)
 
        /* Set the preempt count _outside_ the spinlocks! */
        init_idle_preempt_count(idle, cpu);
-
+#ifdef CONFIG_HAVE_PREEMPT_LAZY
+       task_thread_info(idle)->preempt_lazy_count = 0;
+#endif
        /*
         * The idle tasks have their own, simple scheduling class:
         */
@@ -5195,6 +5491,8 @@ void sched_setnuma(struct task_struct *p, int nid)
 #endif /* CONFIG_NUMA_BALANCING */
 
 #ifdef CONFIG_HOTPLUG_CPU
+static DEFINE_PER_CPU(struct mm_struct *, idle_last_mm);
+
 /*
  * Ensures that the idle task is using init_mm right before its cpu goes
  * offline.
@@ -5209,7 +5507,11 @@ void idle_task_exit(void)
                switch_mm(mm, &init_mm, current);
                finish_arch_post_lock_switch();
        }
-       mmdrop(mm);
+       /*
+        * Defer the cleanup to an alive cpu. On RT we can neither
+        * call mmdrop() nor mmdrop_delayed() from here.
+        */
+       per_cpu(idle_last_mm, smp_processor_id()) = mm;
 }
 
 /*
@@ -5581,6 +5883,10 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
 
        case CPU_DEAD:
                calc_load_migrate(rq);
+               if (per_cpu(idle_last_mm, cpu)) {
+                       mmdrop(per_cpu(idle_last_mm, cpu));
+                       per_cpu(idle_last_mm, cpu) = NULL;
+               }
                break;
 #endif
        }
@@ -5911,6 +6217,7 @@ static int init_rootdomain(struct root_domain *rd)
        rd->rto_cpu = -1;
        raw_spin_lock_init(&rd->rto_lock);
        init_irq_work(&rd->rto_push_work, rto_push_irq_work_func);
+       rd->rto_push_work.flags |= IRQ_WORK_HARD_IRQ;
 #endif
 
        init_dl_bw(&rd->dl_bw);
@@ -7585,7 +7892,7 @@ void __init sched_init(void)
 #ifdef CONFIG_DEBUG_ATOMIC_SLEEP
 static inline int preempt_count_equals(int preempt_offset)
 {
-       int nested = preempt_count() + rcu_preempt_depth();
+       int nested = preempt_count() + sched_rcu_preempt_depth();
 
        return (nested == preempt_offset);
 }
diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c
index 5a75b08cfd85..5be58820465c 100644
--- a/kernel/sched/cpudeadline.c
+++ b/kernel/sched/cpudeadline.c
@@ -103,10 +103,10 @@ int cpudl_find(struct cpudl *cp, struct task_struct *p,
        const struct sched_dl_entity *dl_se = &p->dl;
 
        if (later_mask &&
-           cpumask_and(later_mask, cp->free_cpus, &p->cpus_allowed)) {
+           cpumask_and(later_mask, cp->free_cpus, tsk_cpus_allowed(p))) {
                best_cpu = cpumask_any(later_mask);
                goto out;
-       } else if (cpumask_test_cpu(cpudl_maximum(cp), &p->cpus_allowed) &&
+       } else if (cpumask_test_cpu(cpudl_maximum(cp), tsk_cpus_allowed(p)) &&
                        dl_time_before(dl_se->deadline, cp->elements[0].dl)) {
                best_cpu = cpudl_maximum(cp);
                if (later_mask)
diff --git a/kernel/sched/cpupri.c b/kernel/sched/cpupri.c
index 981fcd7dc394..11e9705bf937 100644
--- a/kernel/sched/cpupri.c
+++ b/kernel/sched/cpupri.c
@@ -103,11 +103,11 @@ int cpupri_find(struct cpupri *cp, struct task_struct *p,
                if (skip)
                        continue;
 
-               if (cpumask_any_and(&p->cpus_allowed, vec->mask) >= nr_cpu_ids)
+               if (cpumask_any_and(tsk_cpus_allowed(p), vec->mask) >= nr_cpu_ids)
                        continue;
 
                if (lowest_mask) {
-                       cpumask_and(lowest_mask, &p->cpus_allowed, vec->mask);
+                       cpumask_and(lowest_mask, tsk_cpus_allowed(p), vec->mask);
 
                        /*
                         * We have to ensure that we have at least one bit
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index a1aecbedf5b1..558b98af241d 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -685,7 +685,7 @@ static cputime_t get_vtime_delta(struct task_struct *tsk)
 {
        unsigned long long delta = vtime_delta(tsk);
 
-       WARN_ON_ONCE(tsk->vtime_snap_whence == VTIME_SLEEPING);
+       WARN_ON_ONCE(tsk->vtime_snap_whence == VTIME_INACTIVE);
        tsk->vtime_snap += delta;
 
        /* CHECKME: always safe to convert nsecs to cputime? */
@@ -701,37 +701,37 @@ static void __vtime_account_system(struct task_struct *tsk)
 
 void vtime_account_system(struct task_struct *tsk)
 {
-       write_seqlock(&tsk->vtime_seqlock);
+       write_seqcount_begin(&tsk->vtime_seqcount);
        __vtime_account_system(tsk);
-       write_sequnlock(&tsk->vtime_seqlock);
+       write_seqcount_end(&tsk->vtime_seqcount);
 }
 
 void vtime_gen_account_irq_exit(struct task_struct *tsk)
 {
-       write_seqlock(&tsk->vtime_seqlock);
+       write_seqcount_begin(&tsk->vtime_seqcount);
        __vtime_account_system(tsk);
        if (context_tracking_in_user())
                tsk->vtime_snap_whence = VTIME_USER;
-       write_sequnlock(&tsk->vtime_seqlock);
+       write_seqcount_end(&tsk->vtime_seqcount);
 }
 
 void vtime_account_user(struct task_struct *tsk)
 {
        cputime_t delta_cpu;
 
-       write_seqlock(&tsk->vtime_seqlock);
+       write_seqcount_begin(&tsk->vtime_seqcount);
        delta_cpu = get_vtime_delta(tsk);
        tsk->vtime_snap_whence = VTIME_SYS;
        account_user_time(tsk, delta_cpu, cputime_to_scaled(delta_cpu));
-       write_sequnlock(&tsk->vtime_seqlock);
+       write_seqcount_end(&tsk->vtime_seqcount);
 }
 
 void vtime_user_enter(struct task_struct *tsk)
 {
-       write_seqlock(&tsk->vtime_seqlock);
+       write_seqcount_begin(&tsk->vtime_seqcount);
        __vtime_account_system(tsk);
        tsk->vtime_snap_whence = VTIME_USER;
-       write_sequnlock(&tsk->vtime_seqlock);
+       write_seqcount_end(&tsk->vtime_seqcount);
 }
 
 void vtime_guest_enter(struct task_struct *tsk)
@@ -743,19 +743,19 @@ void vtime_guest_enter(struct task_struct *tsk)
         * synchronization against the reader (task_gtime())
         * that can thus safely catch up with a tickless delta.
         */
-       write_seqlock(&tsk->vtime_seqlock);
+       write_seqcount_begin(&tsk->vtime_seqcount);
        __vtime_account_system(tsk);
        current->flags |= PF_VCPU;
-       write_sequnlock(&tsk->vtime_seqlock);
+       write_seqcount_end(&tsk->vtime_seqcount);
 }
 EXPORT_SYMBOL_GPL(vtime_guest_enter);
 
 void vtime_guest_exit(struct task_struct *tsk)
 {
-       write_seqlock(&tsk->vtime_seqlock);
+       write_seqcount_begin(&tsk->vtime_seqcount);
        __vtime_account_system(tsk);
        current->flags &= ~PF_VCPU;
-       write_sequnlock(&tsk->vtime_seqlock);
+       write_seqcount_end(&tsk->vtime_seqcount);
 }
 EXPORT_SYMBOL_GPL(vtime_guest_exit);
 
@@ -768,24 +768,26 @@ void vtime_account_idle(struct task_struct *tsk)
 
 void arch_vtime_task_switch(struct task_struct *prev)
 {
-       write_seqlock(&prev->vtime_seqlock);
-       prev->vtime_snap_whence = VTIME_SLEEPING;
-       write_sequnlock(&prev->vtime_seqlock);
+       write_seqcount_begin(&prev->vtime_seqcount);
+       prev->vtime_snap_whence = VTIME_INACTIVE;
+       write_seqcount_end(&prev->vtime_seqcount);
 
-       write_seqlock(&current->vtime_seqlock);
+       write_seqcount_begin(&current->vtime_seqcount);
        current->vtime_snap_whence = VTIME_SYS;
        current->vtime_snap = sched_clock_cpu(smp_processor_id());
-       write_sequnlock(&current->vtime_seqlock);
+       write_seqcount_end(&current->vtime_seqcount);
 }
 
 void vtime_init_idle(struct task_struct *t, int cpu)
 {
        unsigned long flags;
 
-       write_seqlock_irqsave(&t->vtime_seqlock, flags);
+       local_irq_save(flags);
+       write_seqcount_begin(&t->vtime_seqcount);
        t->vtime_snap_whence = VTIME_SYS;
        t->vtime_snap = sched_clock_cpu(cpu);
-       write_sequnlock_irqrestore(&t->vtime_seqlock, flags);
+       write_seqcount_end(&t->vtime_seqcount);
+       local_irq_restore(flags);
 }
 
 cputime_t task_gtime(struct task_struct *t)
@@ -797,13 +799,13 @@ cputime_t task_gtime(struct task_struct *t)
                return t->gtime;
 
        do {
-               seq = read_seqbegin(&t->vtime_seqlock);
+               seq = read_seqcount_begin(&t->vtime_seqcount);
 
                gtime = t->gtime;
                if (t->flags & PF_VCPU)
                        gtime += vtime_delta(t);
 
-       } while (read_seqretry(&t->vtime_seqlock, seq));
+       } while (read_seqcount_retry(&t->vtime_seqcount, seq));
 
        return gtime;
 }
@@ -826,7 +828,7 @@ fetch_task_cputime(struct task_struct *t,
                *udelta = 0;
                *sdelta = 0;
 
-               seq = read_seqbegin(&t->vtime_seqlock);
+               seq = read_seqcount_begin(&t->vtime_seqcount);
 
                if (u_dst)
                        *u_dst = *u_src;
@@ -834,7 +836,7 @@ fetch_task_cputime(struct task_struct *t,
                        *s_dst = *s_src;
 
                /* Task is sleeping, nothing to add */
-               if (t->vtime_snap_whence == VTIME_SLEEPING ||
+               if (t->vtime_snap_whence == VTIME_INACTIVE ||
                    is_idle_task(t))
                        continue;
 
@@ -850,7 +852,7 @@ fetch_task_cputime(struct task_struct *t,
                        if (t->vtime_snap_whence == VTIME_SYS)
                                *sdelta = delta;
                }
-       } while (read_seqretry(&t->vtime_seqlock, seq));
+       } while (read_seqcount_retry(&t->vtime_seqcount, seq));
 }
 
 
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index a996f7356216..645c18fe2075 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -134,7 +134,7 @@ static void inc_dl_migration(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq)
 {
        struct task_struct *p = dl_task_of(dl_se);
 
-       if (p->nr_cpus_allowed > 1)
+       if (tsk_nr_cpus_allowed(p) > 1)
                dl_rq->dl_nr_migratory++;
 
        update_dl_migration(dl_rq);
@@ -144,7 +144,7 @@ static void dec_dl_migration(struct sched_dl_entity *dl_se, struct dl_rq *dl_rq)
 {
        struct task_struct *p = dl_task_of(dl_se);
 
-       if (p->nr_cpus_allowed > 1)
+       if (tsk_nr_cpus_allowed(p) > 1)
                dl_rq->dl_nr_migratory--;
 
        update_dl_migration(dl_rq);
@@ -702,6 +702,7 @@ void init_dl_task_timer(struct sched_dl_entity *dl_se)
 
        hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
        timer->function = dl_task_timer;
+       timer->irqsafe = 1;
 }
 
 /*
@@ -1039,7 +1040,7 @@ static void enqueue_task_dl(struct rq *rq, struct task_struct *p, int flags)
 
        enqueue_dl_entity(&p->dl, pi_se, flags);
 
-       if (!task_current(rq, p) && p->nr_cpus_allowed > 1)
+       if (!task_current(rq, p) && tsk_nr_cpus_allowed(p) > 1)
                enqueue_pushable_dl_task(rq, p);
 }
 
@@ -1117,9 +1118,9 @@ select_task_rq_dl(struct task_struct *p, int cpu, int sd_flag, int flags)
         * try to make it stay here, it might be important.
         */
        if (unlikely(dl_task(curr)) &&
-           (curr->nr_cpus_allowed < 2 ||
+           (tsk_nr_cpus_allowed(curr) < 2 ||
             !dl_entity_preempt(&p->dl, &curr->dl)) &&
-           (p->nr_cpus_allowed > 1)) {
+           (tsk_nr_cpus_allowed(p) > 1)) {
                int target = find_later_rq(p);
 
                if (target != -1 &&
@@ -1140,7 +1141,7 @@ static void check_preempt_equal_dl(struct rq *rq, struct task_struct *p)
         * Current can't be migrated, useless to reschedule,
         * let's hope p can move out.
         */
-       if (rq->curr->nr_cpus_allowed == 1 ||
+       if (tsk_nr_cpus_allowed(rq->curr) == 1 ||
            cpudl_find(&rq->rd->cpudl, rq->curr, NULL) == -1)
                return;
 
@@ -1148,7 +1149,7 @@ static void check_preempt_equal_dl(struct rq *rq, struct task_struct *p)
         * p is migratable, so let's not schedule it and
         * see if it is pushed or pulled somewhere else.
         */
-       if (p->nr_cpus_allowed != 1 &&
+       if (tsk_nr_cpus_allowed(p) != 1 &&
            cpudl_find(&rq->rd->cpudl, p, NULL) != -1)
                return;
 
@@ -1262,7 +1263,7 @@ static void put_prev_task_dl(struct rq *rq, struct task_struct *p)
 {
        update_curr_dl(rq);
 
-       if (on_dl_rq(&p->dl) && p->nr_cpus_allowed > 1)
+       if (on_dl_rq(&p->dl) && tsk_nr_cpus_allowed(p) > 1)
                enqueue_pushable_dl_task(rq, p);
 }
 
@@ -1385,7 +1386,7 @@ static int find_later_rq(struct task_struct *task)
        if (unlikely(!later_mask))
                return -1;
 
-       if (task->nr_cpus_allowed == 1)
+       if (tsk_nr_cpus_allowed(task) == 1)
                return -1;
 
        /*
@@ -1491,7 +1492,7 @@ static struct rq *find_lock_later_rq(struct task_struct *task, struct rq *rq)
                if (double_lock_balance(rq, later_rq)) {
                        if (unlikely(task_rq(task) != rq ||
                                     !cpumask_test_cpu(later_rq->cpu,
-                                                      &task->cpus_allowed) ||
+                                                      tsk_cpus_allowed(task)) ||
                                     task_running(rq, task) ||
                                     !task_on_rq_queued(task))) {
                                double_unlock_balance(rq, later_rq);
@@ -1530,7 +1531,7 @@ static struct task_struct *pick_next_pushable_dl_task(struct rq *rq)
 
        BUG_ON(rq->cpu != task_cpu(p));
        BUG_ON(task_current(rq, p));
-       BUG_ON(p->nr_cpus_allowed <= 1);
+       BUG_ON(tsk_nr_cpus_allowed(p) <= 1);
 
        BUG_ON(!task_on_rq_queued(p));
        BUG_ON(!dl_task(p));
@@ -1569,7 +1570,7 @@ static int push_dl_task(struct rq *rq)
         */
        if (dl_task(rq->curr) &&
            dl_time_before(next_task->dl.deadline, rq->curr->dl.deadline) &&
-           rq->curr->nr_cpus_allowed > 1) {
+           tsk_nr_cpus_allowed(rq->curr) > 1) {
                resched_curr(rq);
                return 0;
        }
@@ -1716,9 +1717,9 @@ static void task_woken_dl(struct rq *rq, struct task_struct *p)
 {
        if (!task_running(rq, p) &&
            !test_tsk_need_resched(rq->curr) &&
-           p->nr_cpus_allowed > 1 &&
+           tsk_nr_cpus_allowed(p) > 1 &&
            dl_task(rq->curr) &&
-           (rq->curr->nr_cpus_allowed < 2 ||
+           (tsk_nr_cpus_allowed(rq->curr) < 2 ||
             !dl_entity_preempt(&p->dl, &rq->curr->dl))) {
                push_dl_tasks(rq);
        }
@@ -1819,7 +1820,7 @@ static void switched_to_dl(struct rq *rq, struct task_struct *p)
 {
        if (task_on_rq_queued(p) && rq->curr != p) {
 #ifdef CONFIG_SMP
-               if (p->nr_cpus_allowed > 1 && rq->dl.overloaded)
+               if (tsk_nr_cpus_allowed(p) > 1 && rq->dl.overloaded)
                        queue_push_tasks(rq);
 #endif
                if (dl_task(rq->curr))
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 641511771ae6..a2d69b883623 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -251,6 +251,9 @@ void print_rt_rq(struct seq_file *m, int cpu, struct rt_rq *rt_rq)
        P(rt_throttled);
        PN(rt_time);
        PN(rt_runtime);
+#ifdef CONFIG_SMP
+       P(rt_nr_migratory);
+#endif
 
 #undef PN
 #undef P
@@ -635,6 +638,10 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
 #endif
        P(policy);
        P(prio);
+#ifdef CONFIG_PREEMPT_RT_FULL
+       P(migrate_disable);
+#endif
+       P(nr_cpus_allowed);
 #undef PN
 #undef __PN
 #undef P
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 812069b66f47..ddf1424bcc78 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3166,7 +3166,7 @@ check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
        ideal_runtime = sched_slice(cfs_rq, curr);
        delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
        if (delta_exec > ideal_runtime) {
-               resched_curr(rq_of(cfs_rq));
+               resched_curr_lazy(rq_of(cfs_rq));
                /*
                 * The current task ran long enough, ensure it doesn't get
                 * re-elected due to buddy favours.
@@ -3190,7 +3190,7 @@ check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
                return;
 
        if (delta > ideal_runtime)
-               resched_curr(rq_of(cfs_rq));
+               resched_curr_lazy(rq_of(cfs_rq));
 }
 
 static void
@@ -3330,7 +3330,7 @@ entity_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr, int queued)
         * validating it and just reschedule.
         */
        if (queued) {
-               resched_curr(rq_of(cfs_rq));
+               resched_curr_lazy(rq_of(cfs_rq));
                return;
        }
        /*
@@ -3512,7 +3512,7 @@ static void __account_cfs_rq_runtime(struct cfs_rq *cfs_rq, u64 delta_exec)
         * hierarchy can be throttled
         */
        if (!assign_cfs_rq_runtime(cfs_rq) && likely(cfs_rq->curr))
-               resched_curr(rq_of(cfs_rq));
+               resched_curr_lazy(rq_of(cfs_rq));
 }
 
 static __always_inline
@@ -4144,7 +4144,7 @@ static void hrtick_start_fair(struct rq *rq, struct task_struct *p)
 
                if (delta < 0) {
                        if (rq->curr == p)
-                               resched_curr(rq);
+                               resched_curr_lazy(rq);
                        return;
                }
                hrtick_start(rq, delta);
@@ -5232,7 +5232,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int wake_
        return;
 
 preempt:
-       resched_curr(rq);
+       resched_curr_lazy(rq);
        /*
         * Only set the backward buddy when the current task is still
         * on the rq. This can happen when a wakeup gets interleaved
@@ -7983,7 +7983,7 @@ static void task_fork_fair(struct task_struct *p)
                 * 'current' within the tree based on its new key value.
                 */
                swap(curr->vruntime, se->vruntime);
-               resched_curr(rq);
+               resched_curr_lazy(rq);
        }
 
        se->vruntime -= cfs_rq->min_vruntime;
@@ -8008,7 +8008,7 @@ prio_changed_fair(struct rq *rq, struct task_struct *p, int oldprio)
         */
        if (rq->curr == p) {
                if (p->prio > oldprio)
-                       resched_curr(rq);
+                       resched_curr_lazy(rq);
        } else
                check_preempt_curr(rq, p, 0);
 }
diff --git a/kernel/sched/features.h b/kernel/sched/features.h
index 69631fa46c2f..6d28fcd08872 100644
--- a/kernel/sched/features.h
+++ b/kernel/sched/features.h
@@ -45,11 +45,19 @@ SCHED_FEAT(LB_BIAS, true)
  */
 SCHED_FEAT(NONTASK_CAPACITY, true)
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+SCHED_FEAT(TTWU_QUEUE, false)
+# ifdef CONFIG_PREEMPT_LAZY
+SCHED_FEAT(PREEMPT_LAZY, true)
+# endif
+#else
+
 /*
  * Queue remote wakeups on the target CPU and process them
  * using the scheduler IPI. Reduces rq->lock contention/bounces.
  */
 SCHED_FEAT(TTWU_QUEUE, true)
+#endif
 
 #ifdef HAVE_RT_PUSH_IPI
 /*
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 95fefb364dab..14f2d740edab 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -47,6 +47,7 @@ void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime)
 
        hrtimer_init(&rt_b->rt_period_timer,
                        CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+       rt_b->rt_period_timer.irqsafe = 1;
        rt_b->rt_period_timer.function = sched_rt_period_timer;
 }
 
@@ -315,7 +316,7 @@ static void inc_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
        rt_rq = &rq_of_rt_rq(rt_rq)->rt;
 
        rt_rq->rt_nr_total++;
-       if (p->nr_cpus_allowed > 1)
+       if (tsk_nr_cpus_allowed(p) > 1)
                rt_rq->rt_nr_migratory++;
 
        update_rt_migration(rt_rq);
@@ -332,7 +333,7 @@ static void dec_rt_migration(struct sched_rt_entity *rt_se, struct rt_rq *rt_rq)
        rt_rq = &rq_of_rt_rq(rt_rq)->rt;
 
        rt_rq->rt_nr_total--;
-       if (p->nr_cpus_allowed > 1)
+       if (tsk_nr_cpus_allowed(p) > 1)
                rt_rq->rt_nr_migratory--;
 
        update_rt_migration(rt_rq);
@@ -1251,7 +1252,7 @@ enqueue_task_rt(struct rq *rq, struct task_struct *p, int flags)
 
        enqueue_rt_entity(rt_se, flags & ENQUEUE_HEAD);
 
-       if (!task_current(rq, p) && p->nr_cpus_allowed > 1)
+       if (!task_current(rq, p) && tsk_nr_cpus_allowed(p) > 1)
                enqueue_pushable_task(rq, p);
 }
 
@@ -1340,7 +1341,7 @@ select_task_rq_rt(struct task_struct *p, int cpu, int sd_flag, int flags)
         * will have to sort it out.
         */
        if (curr && unlikely(rt_task(curr)) &&
-           (curr->nr_cpus_allowed < 2 ||
+           (tsk_nr_cpus_allowed(curr) < 2 ||
             curr->prio <= p->prio)) {
                int target = find_lowest_rq(p);
 
@@ -1364,7 +1365,7 @@ static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p)
         * Current can't be migrated, useless to reschedule,
         * let's hope p can move out.
         */
-       if (rq->curr->nr_cpus_allowed == 1 ||
+       if (tsk_nr_cpus_allowed(rq->curr) == 1 ||
            !cpupri_find(&rq->rd->cpupri, rq->curr, NULL))
                return;
 
@@ -1372,7 +1373,7 @@ static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p)
         * p is migratable, so let's not schedule it and
         * see if it is pushed or pulled somewhere else.
         */
-       if (p->nr_cpus_allowed != 1
+       if (tsk_nr_cpus_allowed(p) != 1
            && cpupri_find(&rq->rd->cpupri, p, NULL))
                return;
 
@@ -1506,7 +1507,7 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
         * The previous task needs to be made eligible for pushing
         * if it is still active
         */
-       if (on_rt_rq(&p->rt) && p->nr_cpus_allowed > 1)
+       if (on_rt_rq(&p->rt) && tsk_nr_cpus_allowed(p) > 1)
                enqueue_pushable_task(rq, p);
 }
 
@@ -1556,7 +1557,7 @@ static int find_lowest_rq(struct task_struct *task)
        if (unlikely(!lowest_mask))
                return -1;
 
-       if (task->nr_cpus_allowed == 1)
+       if (tsk_nr_cpus_allowed(task) == 1)
                return -1; /* No other targets possible */
 
        if (!cpupri_find(&task_rq(task)->rd->cpupri, task, lowest_mask))
@@ -1688,7 +1689,7 @@ static struct task_struct *pick_next_pushable_task(struct rq *rq)
 
        BUG_ON(rq->cpu != task_cpu(p));
        BUG_ON(task_current(rq, p));
-       BUG_ON(p->nr_cpus_allowed <= 1);
+       BUG_ON(tsk_nr_cpus_allowed(p) <= 1);
 
        BUG_ON(!task_on_rq_queued(p));
        BUG_ON(!rt_task(p));
@@ -2060,9 +2061,9 @@ static void task_woken_rt(struct rq *rq, struct task_struct *p)
 {
        if (!task_running(rq, p) &&
            !test_tsk_need_resched(rq->curr) &&
-           p->nr_cpus_allowed > 1 &&
+           tsk_nr_cpus_allowed(p) > 1 &&
            (dl_task(rq->curr) || rt_task(rq->curr)) &&
-           (rq->curr->nr_cpus_allowed < 2 ||
+           (tsk_nr_cpus_allowed(rq->curr) < 2 ||
             rq->curr->prio <= p->prio))
                push_rt_tasks(rq);
 }
@@ -2135,7 +2136,7 @@ static void switched_to_rt(struct rq *rq, struct task_struct *p)
         */
        if (task_on_rq_queued(p) && rq->curr != p) {
 #ifdef CONFIG_SMP
-               if (p->nr_cpus_allowed > 1 && rq->rt.overloaded)
+               if (tsk_nr_cpus_allowed(p) > 1 && rq->rt.overloaded)
                        queue_push_tasks(rq);
 #endif /* CONFIG_SMP */
                if (p->prio < rq->curr->prio)
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 448a8266ceea..e45a90ce57f7 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1110,6 +1110,7 @@ static inline void finish_lock_switch(struct rq *rq, struct task_struct *prev)
 #define WF_SYNC                0x01            /* waker goes to sleep after wakeup */
 #define WF_FORK                0x02            /* child wakeup after fork */
 #define WF_MIGRATED    0x4             /* internal use, task got migrated */
+#define WF_LOCK_SLEEPER        0x08            /* wakeup spinlock "sleeper" */
 
 /*
  * To aid in avoiding the subversion of "niceness" due to uneven distribution
@@ -1309,6 +1310,15 @@ extern void init_sched_fair_class(void);
 extern void resched_curr(struct rq *rq);
 extern void resched_cpu(int cpu);
 
+#ifdef CONFIG_PREEMPT_LAZY
+extern void resched_curr_lazy(struct rq *rq);
+#else
+static inline void resched_curr_lazy(struct rq *rq)
+{
+       resched_curr(rq);
+}
+#endif
+
 extern struct rt_bandwidth def_rt_bandwidth;
 extern void init_rt_bandwidth(struct rt_bandwidth *rt_b, u64 period, u64 runtime);
 
diff --git a/kernel/sched/swait.c b/kernel/sched/swait.c
new file mode 100644
index 000000000000..205fe36868f9
--- /dev/null
+++ b/kernel/sched/swait.c
@@ -0,0 +1,143 @@
+#include <linux/sched.h>
+#include <linux/swait.h>
+#include <linux/suspend.h>
+
+void __init_swait_queue_head(struct swait_queue_head *q, const char *name,
+                            struct lock_class_key *key)
+{
+       raw_spin_lock_init(&q->lock);
+       lockdep_set_class_and_name(&q->lock, key, name);
+       INIT_LIST_HEAD(&q->task_list);
+}
+EXPORT_SYMBOL(__init_swait_queue_head);
+
+/*
+ * The thing about the wake_up_state() return value; I think we can ignore it.
+ *
+ * If for some reason it would return 0, that means the previously waiting
+ * task is already running, so it will observe condition true (or has already).
+ */
+void swake_up_locked(struct swait_queue_head *q)
+{
+       struct swait_queue *curr;
+
+       if (list_empty(&q->task_list))
+               return;
+
+       curr = list_first_entry(&q->task_list, typeof(*curr), task_list);
+       wake_up_process(curr->task);
+       list_del_init(&curr->task_list);
+}
+EXPORT_SYMBOL(swake_up_locked);
+
+void swake_up_all_locked(struct swait_queue_head *q)
+{
+       struct swait_queue *curr;
+       int wakes = 0;
+
+       while (!list_empty(&q->task_list)) {
+
+               curr = list_first_entry(&q->task_list, typeof(*curr),
+                                       task_list);
+               wake_up_process(curr->task);
+               list_del_init(&curr->task_list);
+               wakes++;
+       }
+       if (pm_in_action)
+               return;
+       WARN(wakes > 2, "complate_all() with %d waiters\n", wakes);
+}
+EXPORT_SYMBOL(swake_up_all_locked);
+
+void swake_up(struct swait_queue_head *q)
+{
+       unsigned long flags;
+
+       if (!swait_active(q))
+               return;
+
+       raw_spin_lock_irqsave(&q->lock, flags);
+       swake_up_locked(q);
+       raw_spin_unlock_irqrestore(&q->lock, flags);
+}
+EXPORT_SYMBOL(swake_up);
+
+/*
+ * Does not allow usage from IRQ disabled, since we must be able to
+ * release IRQs to guarantee bounded hold time.
+ */
+void swake_up_all(struct swait_queue_head *q)
+{
+       struct swait_queue *curr;
+       LIST_HEAD(tmp);
+
+       if (!swait_active(q))
+               return;
+
+       raw_spin_lock_irq(&q->lock);
+       list_splice_init(&q->task_list, &tmp);
+       while (!list_empty(&tmp)) {
+               curr = list_first_entry(&tmp, typeof(*curr), task_list);
+
+               wake_up_state(curr->task, TASK_NORMAL);
+               list_del_init(&curr->task_list);
+
+               if (list_empty(&tmp))
+                       break;
+
+               raw_spin_unlock_irq(&q->lock);
+               raw_spin_lock_irq(&q->lock);
+       }
+       raw_spin_unlock_irq(&q->lock);
+}
+EXPORT_SYMBOL(swake_up_all);
+
+void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait)
+{
+       wait->task = current;
+       if (list_empty(&wait->task_list))
+               list_add(&wait->task_list, &q->task_list);
+}
+
+void prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait, int state)
+{
+       unsigned long flags;
+
+       raw_spin_lock_irqsave(&q->lock, flags);
+       __prepare_to_swait(q, wait);
+       set_current_state(state);
+       raw_spin_unlock_irqrestore(&q->lock, flags);
+}
+EXPORT_SYMBOL(prepare_to_swait);
+
+long prepare_to_swait_event(struct swait_queue_head *q, struct swait_queue *wait, int state)
+{
+       if (signal_pending_state(state, current))
+               return -ERESTARTSYS;
+
+       prepare_to_swait(q, wait, state);
+
+       return 0;
+}
+EXPORT_SYMBOL(prepare_to_swait_event);
+
+void __finish_swait(struct swait_queue_head *q, struct swait_queue *wait)
+{
+       __set_current_state(TASK_RUNNING);
+       if (!list_empty(&wait->task_list))
+               list_del_init(&wait->task_list);
+}
+
+void finish_swait(struct swait_queue_head *q, struct swait_queue *wait)
+{
+       unsigned long flags;
+
+       __set_current_state(TASK_RUNNING);
+
+       if (!list_empty_careful(&wait->task_list)) {
+               raw_spin_lock_irqsave(&q->lock, flags);
+               list_del_init(&wait->task_list);
+               raw_spin_unlock_irqrestore(&q->lock, flags);
+       }
+}
+EXPORT_SYMBOL(finish_swait);
diff --git a/kernel/sched/swork.c b/kernel/sched/swork.c
new file mode 100644
index 000000000000..1950f40ca725
--- /dev/null
+++ b/kernel/sched/swork.c
@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2014 BMW Car IT GmbH, Daniel Wagner daniel.wagner@bmw-carit.de
+ *
+ * Provides a framework for enqueuing callbacks from irq context
+ * PREEMPT_RT_FULL safe. The callbacks are executed in kthread context.
+ */
+
+#include <linux/swait.h>
+#include <linux/swork.h>
+#include <linux/kthread.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/export.h>
+
+#define SWORK_EVENT_PENDING     (1 << 0)
+
+static DEFINE_MUTEX(worker_mutex);
+static struct sworker *glob_worker;
+
+struct sworker {
+       struct list_head events;
+       struct swait_queue_head wq;
+
+       raw_spinlock_t lock;
+
+       struct task_struct *task;
+       int refs;
+};
+
+static bool swork_readable(struct sworker *worker)
+{
+       bool r;
+
+       if (kthread_should_stop())
+               return true;
+
+       raw_spin_lock_irq(&worker->lock);
+       r = !list_empty(&worker->events);
+       raw_spin_unlock_irq(&worker->lock);
+
+       return r;
+}
+
+static int swork_kthread(void *arg)
+{
+       struct sworker *worker = arg;
+
+       for (;;) {
+               swait_event_interruptible(worker->wq,
+                                       swork_readable(worker));
+               if (kthread_should_stop())
+                       break;
+
+               raw_spin_lock_irq(&worker->lock);
+               while (!list_empty(&worker->events)) {
+                       struct swork_event *sev;
+
+                       sev = list_first_entry(&worker->events,
+                                       struct swork_event, item);
+                       list_del(&sev->item);
+                       raw_spin_unlock_irq(&worker->lock);
+
+                       WARN_ON_ONCE(!test_and_clear_bit(SWORK_EVENT_PENDING,
+                                                        &sev->flags));
+                       sev->func(sev);
+                       raw_spin_lock_irq(&worker->lock);
+               }
+               raw_spin_unlock_irq(&worker->lock);
+       }
+       return 0;
+}
+
+static struct sworker *swork_create(void)
+{
+       struct sworker *worker;
+
+       worker = kzalloc(sizeof(*worker), GFP_KERNEL);
+       if (!worker)
+               return ERR_PTR(-ENOMEM);
+
+       INIT_LIST_HEAD(&worker->events);
+       raw_spin_lock_init(&worker->lock);
+       init_swait_queue_head(&worker->wq);
+
+       worker->task = kthread_run(swork_kthread, worker, "kswork");
+       if (IS_ERR(worker->task)) {
+               kfree(worker);
+               return ERR_PTR(-ENOMEM);
+       }
+
+       return worker;
+}
+
+static void swork_destroy(struct sworker *worker)
+{
+       kthread_stop(worker->task);
+
+       WARN_ON(!list_empty(&worker->events));
+       kfree(worker);
+}
+
+/**
+ * swork_queue - queue swork
+ *
+ * Returns %false if @work was already on a queue, %true otherwise.
+ *
+ * The work is queued and processed on a random CPU
+ */
+bool swork_queue(struct swork_event *sev)
+{
+       unsigned long flags;
+
+       if (test_and_set_bit(SWORK_EVENT_PENDING, &sev->flags))
+               return false;
+
+       raw_spin_lock_irqsave(&glob_worker->lock, flags);
+       list_add_tail(&sev->item, &glob_worker->events);
+       raw_spin_unlock_irqrestore(&glob_worker->lock, flags);
+
+       swake_up(&glob_worker->wq);
+       return true;
+}
+EXPORT_SYMBOL_GPL(swork_queue);
+
+/**
+ * swork_get - get an instance of the sworker
+ *
+ * Returns an negative error code if the initialization if the worker did not
+ * work, %0 otherwise.
+ *
+ */
+int swork_get(void)
+{
+       struct sworker *worker;
+
+       mutex_lock(&worker_mutex);
+       if (!glob_worker) {
+               worker = swork_create();
+               if (IS_ERR(worker)) {
+                       mutex_unlock(&worker_mutex);
+                       return -ENOMEM;
+               }
+
+               glob_worker = worker;
+       }
+
+       glob_worker->refs++;
+       mutex_unlock(&worker_mutex);
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(swork_get);
+
+/**
+ * swork_put - puts an instance of the sworker
+ *
+ * Will destroy the sworker thread. This function must not be called until all
+ * queued events have been completed.
+ */
+void swork_put(void)
+{
+       mutex_lock(&worker_mutex);
+
+       glob_worker->refs--;
+       if (glob_worker->refs > 0)
+               goto out;
+
+       swork_destroy(glob_worker);
+       glob_worker = NULL;
+out:
+       mutex_unlock(&worker_mutex);
+}
+EXPORT_SYMBOL_GPL(swork_put);
diff --git a/kernel/signal.c b/kernel/signal.c
index 4a548c6a4118..e870a133857b 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -14,6 +14,7 @@
 #include <linux/export.h>
 #include <linux/init.h>
 #include <linux/sched.h>
+#include <linux/sched/rt.h>
 #include <linux/fs.h>
 #include <linux/tty.h>
 #include <linux/binfmts.h>
@@ -354,13 +355,30 @@ static bool task_participate_group_stop(struct task_struct *task)
        return false;
 }
 
+static inline struct sigqueue *get_task_cache(struct task_struct *t)
+{
+       struct sigqueue *q = t->sigqueue_cache;
+
+       if (cmpxchg(&t->sigqueue_cache, q, NULL) != q)
+               return NULL;
+       return q;
+}
+
+static inline int put_task_cache(struct task_struct *t, struct sigqueue *q)
+{
+       if (cmpxchg(&t->sigqueue_cache, NULL, q) == NULL)
+               return 0;
+       return 1;
+}
+
 /*
  * allocate a new signal queue record
  * - this may be called without locks if and only if t == current, otherwise an
  *   appropriate lock must be held to stop the target task from exiting
  */
 static struct sigqueue *
-__sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimit)
+__sigqueue_do_alloc(int sig, struct task_struct *t, gfp_t flags,
+                   int override_rlimit, int fromslab)
 {
        struct sigqueue *q = NULL;
        struct user_struct *user;
@@ -377,7 +395,10 @@ __sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimi
        if (override_rlimit ||
            atomic_read(&user->sigpending) <=
                        task_rlimit(t, RLIMIT_SIGPENDING)) {
-               q = kmem_cache_alloc(sigqueue_cachep, flags);
+               if (!fromslab)
+                       q = get_task_cache(t);
+               if (!q)
+                       q = kmem_cache_alloc(sigqueue_cachep, flags);
        } else {
                print_dropped_signal(sig);
        }
@@ -394,6 +415,13 @@ __sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags, int override_rlimi
        return q;
 }
 
+static struct sigqueue *
+__sigqueue_alloc(int sig, struct task_struct *t, gfp_t flags,
+                int override_rlimit)
+{
+       return __sigqueue_do_alloc(sig, t, flags, override_rlimit, 0);
+}
+
 static void __sigqueue_free(struct sigqueue *q)
 {
        if (q->flags & SIGQUEUE_PREALLOC)
@@ -403,6 +431,21 @@ static void __sigqueue_free(struct sigqueue *q)
        kmem_cache_free(sigqueue_cachep, q);
 }
 
+static void sigqueue_free_current(struct sigqueue *q)
+{
+       struct user_struct *up;
+
+       if (q->flags & SIGQUEUE_PREALLOC)
+               return;
+
+       up = q->user;
+       if (rt_prio(current->normal_prio) && !put_task_cache(current, q)) {
+               atomic_dec(&up->sigpending);
+               free_uid(up);
+       } else
+                 __sigqueue_free(q);
+}
+
 void flush_sigqueue(struct sigpending *queue)
 {
        struct sigqueue *q;
@@ -415,6 +458,21 @@ void flush_sigqueue(struct sigpending *queue)
        }
 }
 
+/*
+ * Called from __exit_signal. Flush tsk->pending and
+ * tsk->sigqueue_cache
+ */
+void flush_task_sigqueue(struct task_struct *tsk)
+{
+       struct sigqueue *q;
+
+       flush_sigqueue(&tsk->pending);
+
+       q = get_task_cache(tsk);
+       if (q)
+               kmem_cache_free(sigqueue_cachep, q);
+}
+
 /*
  * Flush all pending signals for this kthread.
  */
@@ -534,7 +592,7 @@ static void collect_signal(int sig, struct sigpending *list, siginfo_t *info,
                        (info->si_code == SI_TIMER) &&
                        (info->si_sys_private);
 
-               __sigqueue_free(first);
+               sigqueue_free_current(first);
        } else {
                /*
                 * Ok, it wasn't in the queue.  This must be
@@ -570,6 +628,8 @@ int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
        bool resched_timer = false;
        int signr;
 
+       WARN_ON_ONCE(tsk != current);
+
        /* We only dequeue private signals from ourselves, we don't let
         * signalfd steal them
         */
@@ -1166,8 +1226,8 @@ int do_send_sig_info(int sig, struct siginfo *info, struct task_struct *p,
  * We don't want to have recursive SIGSEGV's etc, for example,
  * that is why we also clear SIGNAL_UNKILLABLE.
  */
-int
-force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
+static int
+do_force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
 {
        unsigned long int flags;
        int ret, blocked, ignored;
@@ -1192,6 +1252,39 @@ force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
        return ret;
 }
 
+int force_sig_info(int sig, struct siginfo *info, struct task_struct *t)
+{
+/*
+ * On some archs, PREEMPT_RT has to delay sending a signal from a trap
+ * since it can not enable preemption, and the signal code's spin_locks
+ * turn into mutexes. Instead, it must set TIF_NOTIFY_RESUME which will
+ * send the signal on exit of the trap.
+ */
+#ifdef ARCH_RT_DELAYS_SIGNAL_SEND
+       if (in_atomic()) {
+               if (WARN_ON_ONCE(t != current))
+                       return 0;
+               if (WARN_ON_ONCE(t->forced_info.si_signo))
+                       return 0;
+
+               if (is_si_special(info)) {
+                       WARN_ON_ONCE(info != SEND_SIG_PRIV);
+                       t->forced_info.si_signo = sig;
+                       t->forced_info.si_errno = 0;
+                       t->forced_info.si_code = SI_KERNEL;
+                       t->forced_info.si_pid = 0;
+                       t->forced_info.si_uid = 0;
+               } else {
+                       t->forced_info = *info;
+               }
+
+               set_tsk_thread_flag(t, TIF_NOTIFY_RESUME);
+               return 0;
+       }
+#endif
+       return do_force_sig_info(sig, info, t);
+}
+
 /*
  * Nuke all other threads in the group.
  */
@@ -1226,12 +1319,12 @@ struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
                 * Disable interrupts early to avoid deadlocks.
                 * See rcu_read_unlock() comment header for details.
                 */
-               local_irq_save(*flags);
+               local_irq_save_nort(*flags);
                rcu_read_lock();
                sighand = rcu_dereference(tsk->sighand);
                if (unlikely(sighand == NULL)) {
                        rcu_read_unlock();
-                       local_irq_restore(*flags);
+                       local_irq_restore_nort(*flags);
                        break;
                }
                /*
@@ -1252,7 +1345,7 @@ struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
                }
                spin_unlock(&sighand->siglock);
                rcu_read_unlock();
-               local_irq_restore(*flags);
+               local_irq_restore_nort(*flags);
        }
 
        return sighand;
@@ -1495,7 +1588,8 @@ EXPORT_SYMBOL(kill_pid);
  */
 struct sigqueue *sigqueue_alloc(void)
 {
-       struct sigqueue *q = __sigqueue_alloc(-1, current, GFP_KERNEL, 0);
+       /* Preallocated sigqueue objects always from the slabcache ! */
+       struct sigqueue *q = __sigqueue_do_alloc(-1, current, GFP_KERNEL, 0, 1);
 
        if (q)
                q->flags |= SIGQUEUE_PREALLOC;
@@ -1856,15 +1950,7 @@ static void ptrace_stop(int exit_code, int why, int clear_code, siginfo_t *info)
                if (gstop_done && ptrace_reparented(current))
                        do_notify_parent_cldstop(current, false, why);
 
-               /*
-                * Don't want to allow preemption here, because
-                * sys_ptrace() needs this task to be inactive.
-                *
-                * XXX: implement read_unlock_no_resched().
-                */
-               preempt_disable();
                read_unlock(&tasklist_lock);
-               preempt_enable_no_resched();
                freezable_schedule();
        } else {
                /*
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 479e4436f787..cb9c1d5dee10 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -21,10 +21,12 @@
 #include <linux/freezer.h>
 #include <linux/kthread.h>
 #include <linux/rcupdate.h>
+#include <linux/delay.h>
 #include <linux/ftrace.h>
 #include <linux/smp.h>
 #include <linux/smpboot.h>
 #include <linux/tick.h>
+#include <linux/locallock.h>
 #include <linux/irq.h>
 
 #define CREATE_TRACE_POINTS
@@ -56,12 +58,108 @@ EXPORT_SYMBOL(irq_stat);
 static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp;
 
 DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
+#ifdef CONFIG_PREEMPT_RT_FULL
+#define TIMER_SOFTIRQS ((1 << TIMER_SOFTIRQ) | (1 << HRTIMER_SOFTIRQ))
+DEFINE_PER_CPU(struct task_struct *, ktimer_softirqd);
+#endif
 
 const char * const softirq_to_name[NR_SOFTIRQS] = {
        "HI", "TIMER", "NET_TX", "NET_RX", "BLOCK", "BLOCK_IOPOLL",
        "TASKLET", "SCHED", "HRTIMER", "RCU"
 };
 
+#ifdef CONFIG_NO_HZ_COMMON
+# ifdef CONFIG_PREEMPT_RT_FULL
+
+struct softirq_runner {
+       struct task_struct *runner[NR_SOFTIRQS];
+};
+
+static DEFINE_PER_CPU(struct softirq_runner, softirq_runners);
+
+static inline void softirq_set_runner(unsigned int sirq)
+{
+       struct softirq_runner *sr = this_cpu_ptr(&softirq_runners);
+
+       sr->runner[sirq] = current;
+}
+
+static inline void softirq_clr_runner(unsigned int sirq)
+{
+       struct softirq_runner *sr = this_cpu_ptr(&softirq_runners);
+
+       sr->runner[sirq] = NULL;
+}
+
+/*
+ * On preempt-rt a softirq running context might be blocked on a
+ * lock. There might be no other runnable task on this CPU because the
+ * lock owner runs on some other CPU. So we have to go into idle with
+ * the pending bit set. Therefor we need to check this otherwise we
+ * warn about false positives which confuses users and defeats the
+ * whole purpose of this test.
+ *
+ * This code is called with interrupts disabled.
+ */
+void softirq_check_pending_idle(void)
+{
+       static int rate_limit;
+       struct softirq_runner *sr = this_cpu_ptr(&softirq_runners);
+       u32 warnpending;
+       int i;
+
+       if (rate_limit >= 10)
+               return;
+
+       warnpending = local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK;
+       for (i = 0; i < NR_SOFTIRQS; i++) {
+               struct task_struct *tsk = sr->runner[i];
+
+               /*
+                * The wakeup code in rtmutex.c wakes up the task
+                * _before_ it sets pi_blocked_on to NULL under
+                * tsk->pi_lock. So we need to check for both: state
+                * and pi_blocked_on.
+                */
+               if (tsk) {
+                       raw_spin_lock(&tsk->pi_lock);
+                       if (tsk->pi_blocked_on || tsk->state == TASK_RUNNING) {
+                               /* Clear all bits pending in that task */
+                               warnpending &= ~(tsk->softirqs_raised);
+                               warnpending &= ~(1 << i);
+                       }
+                       raw_spin_unlock(&tsk->pi_lock);
+               }
+       }
+
+       if (warnpending) {
+               printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
+                      warnpending);
+               rate_limit++;
+       }
+}
+# else
+/*
+ * On !PREEMPT_RT we just printk rate limited:
+ */
+void softirq_check_pending_idle(void)
+{
+       static int rate_limit;
+
+       if (rate_limit < 10 &&
+                       (local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) {
+               printk(KERN_ERR "NOHZ: local_softirq_pending %02x\n",
+                      local_softirq_pending());
+               rate_limit++;
+       }
+}
+# endif
+
+#else /* !CONFIG_NO_HZ_COMMON */
+static inline void softirq_set_runner(unsigned int sirq) { }
+static inline void softirq_clr_runner(unsigned int sirq) { }
+#endif
+
 /*
  * we cannot loop indefinitely here to avoid userspace starvation,
  * but we also don't want to introduce a worst case 1/HZ latency
@@ -77,6 +175,79 @@ static void wakeup_softirqd(void)
                wake_up_process(tsk);
 }
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+static void wakeup_timer_softirqd(void)
+{
+       /* Interrupts are disabled: no need to stop preemption */
+       struct task_struct *tsk = __this_cpu_read(ktimer_softirqd);
+
+       if (tsk && tsk->state != TASK_RUNNING)
+               wake_up_process(tsk);
+}
+#endif
+
+static void handle_softirq(unsigned int vec_nr)
+{
+       struct softirq_action *h = softirq_vec + vec_nr;
+       int prev_count;
+
+       prev_count = preempt_count();
+
+       kstat_incr_softirqs_this_cpu(vec_nr);
+
+       trace_softirq_entry(vec_nr);
+       h->action(h);
+       trace_softirq_exit(vec_nr);
+       if (unlikely(prev_count != preempt_count())) {
+               pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n",
+                      vec_nr, softirq_to_name[vec_nr], h->action,
+                      prev_count, preempt_count());
+               preempt_count_set(prev_count);
+       }
+}
+
+#ifndef CONFIG_PREEMPT_RT_FULL
+static inline int ksoftirqd_softirq_pending(void)
+{
+       return local_softirq_pending();
+}
+
+static void handle_pending_softirqs(u32 pending)
+{
+       struct softirq_action *h = softirq_vec;
+       int softirq_bit;
+
+       local_irq_enable();
+
+       h = softirq_vec;
+
+       while ((softirq_bit = ffs(pending))) {
+               unsigned int vec_nr;
+
+               h += softirq_bit - 1;
+               vec_nr = h - softirq_vec;
+               handle_softirq(vec_nr);
+
+               h++;
+               pending >>= softirq_bit;
+       }
+
+       rcu_bh_qs();
+       local_irq_disable();
+}
+
+static void run_ksoftirqd(unsigned int cpu)
+{
+       local_irq_disable();
+       if (ksoftirqd_softirq_pending()) {
+               __do_softirq();
+               local_irq_enable();
+               cond_resched_rcu_qs();
+               return;
+       }
+       local_irq_enable();
+}
+
 /*
  * preempt_count and SOFTIRQ_OFFSET usage:
  * - preempt_count is changed by SOFTIRQ_OFFSET on entering or leaving
@@ -116,9 +287,9 @@ void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
 
        if (preempt_count() == cnt) {
 #ifdef CONFIG_DEBUG_PREEMPT
-               current->preempt_disable_ip = get_parent_ip(CALLER_ADDR1);
+               current->preempt_disable_ip = get_lock_parent_ip();
 #endif
-               trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
+               trace_preempt_off(CALLER_ADDR0, get_lock_parent_ip());
        }
 }
 EXPORT_SYMBOL(__local_bh_disable_ip);
@@ -232,10 +403,8 @@ asmlinkage __visible void __do_softirq(void)
        unsigned long end = jiffies + MAX_SOFTIRQ_TIME;
        unsigned long old_flags = current->flags;
        int max_restart = MAX_SOFTIRQ_RESTART;
-       struct softirq_action *h;
        bool in_hardirq;
        __u32 pending;
-       int softirq_bit;
 
        /*
         * Mask out PF_MEMALLOC s current task context is borrowed for the
@@ -254,36 +423,7 @@ asmlinkage __visible void __do_softirq(void)
        /* Reset the pending bitmask before enabling irqs */
        set_softirq_pending(0);
 
-       local_irq_enable();
-
-       h = softirq_vec;
-
-       while ((softirq_bit = ffs(pending))) {
-               unsigned int vec_nr;
-               int prev_count;
-
-               h += softirq_bit - 1;
-
-               vec_nr = h - softirq_vec;
-               prev_count = preempt_count();
-
-               kstat_incr_softirqs_this_cpu(vec_nr);
-
-               trace_softirq_entry(vec_nr);
-               h->action(h);
-               trace_softirq_exit(vec_nr);
-               if (unlikely(prev_count != preempt_count())) {
-                       pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n",
-                              vec_nr, softirq_to_name[vec_nr], h->action,
-                              prev_count, preempt_count());
-                       preempt_count_set(prev_count);
-               }
-               h++;
-               pending >>= softirq_bit;
-       }
-
-       rcu_bh_qs();
-       local_irq_disable();
+       handle_pending_softirqs(pending);
 
        pending = local_softirq_pending();
        if (pending) {
@@ -319,6 +459,310 @@ asmlinkage __visible void do_softirq(void)
        local_irq_restore(flags);
 }
 
+/*
+ * This function must run with irqs disabled!
+ */
+void raise_softirq_irqoff(unsigned int nr)
+{
+       __raise_softirq_irqoff(nr);
+
+       /*
+        * If we're in an interrupt or softirq, we're done
+        * (this also catches softirq-disabled code). We will
+        * actually run the softirq once we return from
+        * the irq or softirq.
+        *
+        * Otherwise we wake up ksoftirqd to make sure we
+        * schedule the softirq soon.
+        */
+       if (!in_interrupt())
+               wakeup_softirqd();
+}
+
+void __raise_softirq_irqoff(unsigned int nr)
+{
+       trace_softirq_raise(nr);
+       or_softirq_pending(1UL << nr);
+}
+
+static inline void local_bh_disable_nort(void) { local_bh_disable(); }
+static inline void _local_bh_enable_nort(void) { _local_bh_enable(); }
+static void ksoftirqd_set_sched_params(unsigned int cpu) { }
+
+#else /* !PREEMPT_RT_FULL */
+
+/*
+ * On RT we serialize softirq execution with a cpu local lock per softirq
+ */
+static DEFINE_PER_CPU(struct local_irq_lock [NR_SOFTIRQS], local_softirq_locks);
+
+void __init softirq_early_init(void)
+{
+       int i;
+
+       for (i = 0; i < NR_SOFTIRQS; i++)
+               local_irq_lock_init(local_softirq_locks[i]);
+}
+
+static void lock_softirq(int which)
+{
+       local_lock(local_softirq_locks[which]);
+}
+
+static void unlock_softirq(int which)
+{
+       local_unlock(local_softirq_locks[which]);
+}
+
+static void do_single_softirq(int which)
+{
+       unsigned long old_flags = current->flags;
+
+       current->flags &= ~PF_MEMALLOC;
+       vtime_account_irq_enter(current);
+       current->flags |= PF_IN_SOFTIRQ;
+       lockdep_softirq_enter();
+       local_irq_enable();
+       handle_softirq(which);
+       local_irq_disable();
+       lockdep_softirq_exit();
+       current->flags &= ~PF_IN_SOFTIRQ;
+       vtime_account_irq_enter(current);
+       tsk_restore_flags(current, old_flags, PF_MEMALLOC);
+}
+
+/*
+ * Called with interrupts disabled. Process softirqs which were raised
+ * in current context (or on behalf of ksoftirqd).
+ */
+static void do_current_softirqs(void)
+{
+       while (current->softirqs_raised) {
+               int i = __ffs(current->softirqs_raised);
+               unsigned int pending, mask = (1U << i);
+
+               current->softirqs_raised &= ~mask;
+               local_irq_enable();
+
+               /*
+                * If the lock is contended, we boost the owner to
+                * process the softirq or leave the critical section
+                * now.
+                */
+               lock_softirq(i);
+               local_irq_disable();
+               softirq_set_runner(i);
+               /*
+                * Check with the local_softirq_pending() bits,
+                * whether we need to process this still or if someone
+                * else took care of it.
+                */
+               pending = local_softirq_pending();
+               if (pending & mask) {
+                       set_softirq_pending(pending & ~mask);
+                       do_single_softirq(i);
+               }
+               softirq_clr_runner(i);
+               WARN_ON(current->softirq_nestcnt != 1);
+               local_irq_enable();
+               unlock_softirq(i);
+               local_irq_disable();
+       }
+}
+
+void __local_bh_disable(void)
+{
+       if (++current->softirq_nestcnt == 1)
+               migrate_disable();
+}
+EXPORT_SYMBOL(__local_bh_disable);
+
+void __local_bh_enable(void)
+{
+       if (WARN_ON(current->softirq_nestcnt == 0))
+               return;
+
+       local_irq_disable();
+       if (current->softirq_nestcnt == 1 && current->softirqs_raised)
+               do_current_softirqs();
+       local_irq_enable();
+
+       if (--current->softirq_nestcnt == 0)
+               migrate_enable();
+}
+EXPORT_SYMBOL(__local_bh_enable);
+
+void _local_bh_enable(void)
+{
+       if (WARN_ON(current->softirq_nestcnt == 0))
+               return;
+       if (--current->softirq_nestcnt == 0)
+               migrate_enable();
+}
+EXPORT_SYMBOL(_local_bh_enable);
+
+int in_serving_softirq(void)
+{
+       return current->flags & PF_IN_SOFTIRQ;
+}
+EXPORT_SYMBOL(in_serving_softirq);
+
+/* Called with preemption disabled */
+static void run_ksoftirqd(unsigned int cpu)
+{
+       local_irq_disable();
+       current->softirq_nestcnt++;
+
+       do_current_softirqs();
+       current->softirq_nestcnt--;
+       local_irq_enable();
+       cond_resched_rcu_qs();
+}
+
+/*
+ * Called from netif_rx_ni(). Preemption enabled, but migration
+ * disabled. So the cpu can't go away under us.
+ */
+void thread_do_softirq(void)
+{
+       if (!in_serving_softirq() && current->softirqs_raised) {
+               current->softirq_nestcnt++;
+               do_current_softirqs();
+               current->softirq_nestcnt--;
+       }
+}
+
+static void do_raise_softirq_irqoff(unsigned int nr)
+{
+       unsigned int mask;
+
+       mask = 1UL << nr;
+
+       trace_softirq_raise(nr);
+       or_softirq_pending(mask);
+
+       /*
+        * If we are not in a hard interrupt and inside a bh disabled
+        * region, we simply raise the flag on current. local_bh_enable()
+        * will make sure that the softirq is executed. Otherwise we
+        * delegate it to ksoftirqd.
+        */
+       if (!in_irq() && current->softirq_nestcnt)
+               current->softirqs_raised |= mask;
+       else if (!__this_cpu_read(ksoftirqd) || !__this_cpu_read(ktimer_softirqd))
+               return;
+
+       if (mask & TIMER_SOFTIRQS)
+               __this_cpu_read(ktimer_softirqd)->softirqs_raised |= mask;
+       else
+               __this_cpu_read(ksoftirqd)->softirqs_raised |= mask;
+}
+
+static void wakeup_proper_softirq(unsigned int nr)
+{
+       if ((1UL << nr) & TIMER_SOFTIRQS)
+               wakeup_timer_softirqd();
+       else
+               wakeup_softirqd();
+}
+
+
+void __raise_softirq_irqoff(unsigned int nr)
+{
+       do_raise_softirq_irqoff(nr);
+       if (!in_irq() && !current->softirq_nestcnt)
+               wakeup_proper_softirq(nr);
+}
+
+/*
+ * Same as __raise_softirq_irqoff() but will process them in ksoftirqd
+ */
+void __raise_softirq_irqoff_ksoft(unsigned int nr)
+{
+       unsigned int mask;
+
+       if (WARN_ON_ONCE(!__this_cpu_read(ksoftirqd) ||
+                        !__this_cpu_read(ktimer_softirqd)))
+               return;
+       mask = 1UL << nr;
+
+       trace_softirq_raise(nr);
+       or_softirq_pending(mask);
+       if (mask & TIMER_SOFTIRQS)
+               __this_cpu_read(ktimer_softirqd)->softirqs_raised |= mask;
+       else
+               __this_cpu_read(ksoftirqd)->softirqs_raised |= mask;
+       wakeup_proper_softirq(nr);
+}
+
+/*
+ * This function must run with irqs disabled!
+ */
+void raise_softirq_irqoff(unsigned int nr)
+{
+       do_raise_softirq_irqoff(nr);
+
+       /*
+        * If we're in an hard interrupt we let irq return code deal
+        * with the wakeup of ksoftirqd.
+        */
+       if (in_irq())
+               return;
+       /*
+        * If we are in thread context but outside of a bh disabled
+        * region, we need to wake ksoftirqd as well.
+        *
+        * CHECKME: Some of the places which do that could be wrapped
+        * into local_bh_disable/enable pairs. Though it's unclear
+        * whether this is worth the effort. To find those places just
+        * raise a WARN() if the condition is met.
+        */
+       if (!current->softirq_nestcnt)
+               wakeup_proper_softirq(nr);
+}
+
+static inline int ksoftirqd_softirq_pending(void)
+{
+       return current->softirqs_raised;
+}
+
+static inline void local_bh_disable_nort(void) { }
+static inline void _local_bh_enable_nort(void) { }
+
+static inline void ksoftirqd_set_sched_params(unsigned int cpu)
+{
+       /* Take over all but timer pending softirqs when starting */
+       local_irq_disable();
+       current->softirqs_raised = local_softirq_pending() & ~TIMER_SOFTIRQS;
+       local_irq_enable();
+}
+
+static inline void ktimer_softirqd_set_sched_params(unsigned int cpu)
+{
+       struct sched_param param = { .sched_priority = 1 };
+
+       sched_setscheduler(current, SCHED_FIFO, &param);
+
+       /* Take over timer pending softirqs when starting */
+       local_irq_disable();
+       current->softirqs_raised = local_softirq_pending() & TIMER_SOFTIRQS;
+       local_irq_enable();
+}
+
+static inline void ktimer_softirqd_clr_sched_params(unsigned int cpu,
+                                                   bool online)
+{
+       struct sched_param param = { .sched_priority = 0 };
+
+       sched_setscheduler(current, SCHED_NORMAL, &param);
+}
+
+static int ktimer_softirqd_should_run(unsigned int cpu)
+{
+       return current->softirqs_raised;
+}
+
+#endif /* PREEMPT_RT_FULL */
 /*
  * Enter an interrupt context.
  */
@@ -330,9 +774,9 @@ void irq_enter(void)
                 * Prevent raise_softirq from needlessly waking up ksoftirqd
                 * here, as softirq will be serviced on return from interrupt.
                 */
-               local_bh_disable();
+               local_bh_disable_nort();
                tick_irq_enter();
-               _local_bh_enable();
+               _local_bh_enable_nort();
        }
 
        __irq_enter();
@@ -340,6 +784,7 @@ void irq_enter(void)
 
 static inline void invoke_softirq(void)
 {
+#ifndef CONFIG_PREEMPT_RT_FULL
        if (!force_irqthreads) {
 #ifdef CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK
                /*
@@ -359,6 +804,18 @@ static inline void invoke_softirq(void)
        } else {
                wakeup_softirqd();
        }
+#else /* PREEMPT_RT_FULL */
+       unsigned long flags;
+
+       local_irq_save(flags);
+       if (__this_cpu_read(ksoftirqd) &&
+                       __this_cpu_read(ksoftirqd)->softirqs_raised)
+               wakeup_softirqd();
+       if (__this_cpu_read(ktimer_softirqd) &&
+                       __this_cpu_read(ktimer_softirqd)->softirqs_raised)
+               wakeup_timer_softirqd();
+       local_irq_restore(flags);
+#endif
 }
 
 static inline void tick_irq_exit(void)
@@ -395,26 +852,6 @@ void irq_exit(void)
        trace_hardirq_exit(); /* must be last! */
 }
 
-/*
- * This function must run with irqs disabled!
- */
-inline void raise_softirq_irqoff(unsigned int nr)
-{
-       __raise_softirq_irqoff(nr);
-
-       /*
-        * If we're in an interrupt or softirq, we're done
-        * (this also catches softirq-disabled code). We will
-        * actually run the softirq once we return from
-        * the irq or softirq.
-        *
-        * Otherwise we wake up ksoftirqd to make sure we
-        * schedule the softirq soon.
-        */
-       if (!in_interrupt())
-               wakeup_softirqd();
-}
-
 void raise_softirq(unsigned int nr)
 {
        unsigned long flags;
@@ -424,12 +861,6 @@ void raise_softirq(unsigned int nr)
        local_irq_restore(flags);
 }
 
-void __raise_softirq_irqoff(unsigned int nr)
-{
-       trace_softirq_raise(nr);
-       or_softirq_pending(1UL << nr);
-}
-
 void open_softirq(int nr, void (*action)(struct softirq_action *))
 {
        softirq_vec[nr].action = action;
@@ -446,15 +877,45 @@ struct tasklet_head {
 static DEFINE_PER_CPU(struct tasklet_head, tasklet_vec);
 static DEFINE_PER_CPU(struct tasklet_head, tasklet_hi_vec);
 
+static void inline
+__tasklet_common_schedule(struct tasklet_struct *t, struct tasklet_head *head, unsigned int nr)
+{
+       if (tasklet_trylock(t)) {
+again:
+               /* We may have been preempted before tasklet_trylock
+                * and __tasklet_action may have already run.
+                * So double check the sched bit while the takslet
+                * is locked before adding it to the list.
+                */
+               if (test_bit(TASKLET_STATE_SCHED, &t->state)) {
+                       t->next = NULL;
+                       *head->tail = t;
+                       head->tail = &(t->next);
+                       raise_softirq_irqoff(nr);
+                       tasklet_unlock(t);
+               } else {
+                       /* This is subtle. If we hit the corner case above
+                        * It is possible that we get preempted right here,
+                        * and another task has successfully called
+                        * tasklet_schedule(), then this function, and
+                        * failed on the trylock. Thus we must be sure
+                        * before releasing the tasklet lock, that the
+                        * SCHED_BIT is clear. Otherwise the tasklet
+                        * may get its SCHED_BIT set, but not added to the
+                        * list
+                        */
+                       if (!tasklet_tryunlock(t))
+                               goto again;
+               }
+       }
+}
+
 void __tasklet_schedule(struct tasklet_struct *t)
 {
        unsigned long flags;
 
        local_irq_save(flags);
-       t->next = NULL;
-       *__this_cpu_read(tasklet_vec.tail) = t;
-       __this_cpu_write(tasklet_vec.tail, &(t->next));
-       raise_softirq_irqoff(TASKLET_SOFTIRQ);
+       __tasklet_common_schedule(t, this_cpu_ptr(&tasklet_vec), TASKLET_SOFTIRQ);
        local_irq_restore(flags);
 }
 EXPORT_SYMBOL(__tasklet_schedule);
@@ -464,10 +925,7 @@ void __tasklet_hi_schedule(struct tasklet_struct *t)
        unsigned long flags;
 
        local_irq_save(flags);
-       t->next = NULL;
-       *__this_cpu_read(tasklet_hi_vec.tail) = t;
-       __this_cpu_write(tasklet_hi_vec.tail,  &(t->next));
-       raise_softirq_irqoff(HI_SOFTIRQ);
+       __tasklet_common_schedule(t, this_cpu_ptr(&tasklet_hi_vec), HI_SOFTIRQ);
        local_irq_restore(flags);
 }
 EXPORT_SYMBOL(__tasklet_hi_schedule);
@@ -476,82 +934,122 @@ void __tasklet_hi_schedule_first(struct tasklet_struct *t)
 {
        BUG_ON(!irqs_disabled());
 
-       t->next = __this_cpu_read(tasklet_hi_vec.head);
-       __this_cpu_write(tasklet_hi_vec.head, t);
-       __raise_softirq_irqoff(HI_SOFTIRQ);
+       __tasklet_hi_schedule(t);
 }
 EXPORT_SYMBOL(__tasklet_hi_schedule_first);
 
-static void tasklet_action(struct softirq_action *a)
+void  tasklet_enable(struct tasklet_struct *t)
 {
-       struct tasklet_struct *list;
+       if (!atomic_dec_and_test(&t->count))
+               return;
+       if (test_and_clear_bit(TASKLET_STATE_PENDING, &t->state))
+               tasklet_schedule(t);
+}
+EXPORT_SYMBOL(tasklet_enable);
 
-       local_irq_disable();
-       list = __this_cpu_read(tasklet_vec.head);
-       __this_cpu_write(tasklet_vec.head, NULL);
-       __this_cpu_write(tasklet_vec.tail, this_cpu_ptr(&tasklet_vec.head));
-       local_irq_enable();
+static void __tasklet_action(struct softirq_action *a,
+                            struct tasklet_struct *list)
+{
+       int loops = 1000000;
 
        while (list) {
                struct tasklet_struct *t = list;
 
                list = list->next;
 
-               if (tasklet_trylock(t)) {
-                       if (!atomic_read(&t->count)) {
-                               if (!test_and_clear_bit(TASKLET_STATE_SCHED,
-                                                       &t->state))
-                                       BUG();
-                               t->func(t->data);
-                               tasklet_unlock(t);
-                               continue;
-                       }
-                       tasklet_unlock(t);
+               /*
+                * Should always succeed - after a tasklist got on the
+                * list (after getting the SCHED bit set from 0 to 1),
+                * nothing but the tasklet softirq it got queued to can
+                * lock it:
+                */
+               if (!tasklet_trylock(t)) {
+                       WARN_ON(1);
+                       continue;
                }
 
-               local_irq_disable();
                t->next = NULL;
-               *__this_cpu_read(tasklet_vec.tail) = t;
-               __this_cpu_write(tasklet_vec.tail, &(t->next));
-               __raise_softirq_irqoff(TASKLET_SOFTIRQ);
-               local_irq_enable();
+
+               /*
+                * If we cannot handle the tasklet because it's disabled,
+                * mark it as pending. tasklet_enable() will later
+                * re-schedule the tasklet.
+                */
+               if (unlikely(atomic_read(&t->count))) {
+out_disabled:
+                       /* implicit unlock: */
+                       wmb();
+                       t->state = TASKLET_STATEF_PENDING;
+                       continue;
+               }
+
+               /*
+                * After this point on the tasklet might be rescheduled
+                * on another CPU, but it can only be added to another
+                * CPU's tasklet list if we unlock the tasklet (which we
+                * dont do yet).
+                */
+               if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
+                       WARN_ON(1);
+
+again:
+               t->func(t->data);
+
+               /*
+                * Try to unlock the tasklet. We must use cmpxchg, because
+                * another CPU might have scheduled or disabled the tasklet.
+                * We only allow the STATE_RUN -> 0 transition here.
+                */
+               while (!tasklet_tryunlock(t)) {
+                       /*
+                        * If it got disabled meanwhile, bail out:
+                        */
+                       if (atomic_read(&t->count))
+                               goto out_disabled;
+                       /*
+                        * If it got scheduled meanwhile, re-execute
+                        * the tasklet function:
+                        */
+                       if (test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
+                               goto again;
+                       if (!--loops) {
+                               printk("hm, tasklet state: %08lx\n", t->state);
+                               WARN_ON(1);
+                               tasklet_unlock(t);
+                               break;
+                       }
+               }
        }
 }
 
+static void tasklet_action(struct softirq_action *a)
+{
+       struct tasklet_struct *list;
+
+       local_irq_disable();
+
+       list = __this_cpu_read(tasklet_vec.head);
+       __this_cpu_write(tasklet_vec.head, NULL);
+       __this_cpu_write(tasklet_vec.tail, this_cpu_ptr(&tasklet_vec.head));
+
+       local_irq_enable();
+
+       __tasklet_action(a, list);
+}
+
 static void tasklet_hi_action(struct softirq_action *a)
 {
        struct tasklet_struct *list;
 
        local_irq_disable();
+
        list = __this_cpu_read(tasklet_hi_vec.head);
        __this_cpu_write(tasklet_hi_vec.head, NULL);
        __this_cpu_write(tasklet_hi_vec.tail, this_cpu_ptr(&tasklet_hi_vec.head));
-       local_irq_enable();
 
-       while (list) {
-               struct tasklet_struct *t = list;
-
-               list = list->next;
-
-               if (tasklet_trylock(t)) {
-                       if (!atomic_read(&t->count)) {
-                               if (!test_and_clear_bit(TASKLET_STATE_SCHED,
-                                                       &t->state))
-                                       BUG();
-                               t->func(t->data);
-                               tasklet_unlock(t);
-                               continue;
-                       }
-                       tasklet_unlock(t);
-               }
+       local_irq_enable();
 
-               local_irq_disable();
-               t->next = NULL;
-               *__this_cpu_read(tasklet_hi_vec.tail) = t;
-               __this_cpu_write(tasklet_hi_vec.tail, &(t->next));
-               __raise_softirq_irqoff(HI_SOFTIRQ);
-               local_irq_enable();
-       }
+       __tasklet_action(a, list);
 }
 
 void tasklet_init(struct tasklet_struct *t,
@@ -572,7 +1070,7 @@ void tasklet_kill(struct tasklet_struct *t)
 
        while (test_and_set_bit(TASKLET_STATE_SCHED, &t->state)) {
                do {
-                       yield();
+                       msleep(1);
                } while (test_bit(TASKLET_STATE_SCHED, &t->state));
        }
        tasklet_unlock_wait(t);
@@ -646,25 +1144,26 @@ void __init softirq_init(void)
        open_softirq(HI_SOFTIRQ, tasklet_hi_action);
 }
 
-static int ksoftirqd_should_run(unsigned int cpu)
-{
-       return local_softirq_pending();
-}
-
-static void run_ksoftirqd(unsigned int cpu)
+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
+void tasklet_unlock_wait(struct tasklet_struct *t)
 {
-       local_irq_disable();
-       if (local_softirq_pending()) {
+       while (test_bit(TASKLET_STATE_RUN, &(t)->state)) {
                /*
-                * We can safely run softirq on inline stack, as we are not deep
-                * in the task stack here.
+                * Hack for now to avoid this busy-loop:
                 */
-               __do_softirq();
-               local_irq_enable();
-               cond_resched_rcu_qs();
-               return;
+#ifdef CONFIG_PREEMPT_RT_FULL
+               msleep(1);
+#else
+               barrier();
+#endif
        }
-       local_irq_enable();
+}
+EXPORT_SYMBOL(tasklet_unlock_wait);
+#endif
+
+static int ksoftirqd_should_run(unsigned int cpu)
+{
+       return ksoftirqd_softirq_pending();
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
@@ -746,16 +1245,31 @@ static struct notifier_block cpu_nfb = {
 
 static struct smp_hotplug_thread softirq_threads = {
        .store                  = &ksoftirqd,
+       .setup                  = ksoftirqd_set_sched_params,
        .thread_should_run      = ksoftirqd_should_run,
        .thread_fn              = run_ksoftirqd,
        .thread_comm            = "ksoftirqd/%u",
 };
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+static struct smp_hotplug_thread softirq_timer_threads = {
+       .store                  = &ktimer_softirqd,
+       .setup                  = ktimer_softirqd_set_sched_params,
+       .cleanup                = ktimer_softirqd_clr_sched_params,
+       .thread_should_run      = ktimer_softirqd_should_run,
+       .thread_fn              = run_ksoftirqd,
+       .thread_comm            = "ktimersoftd/%u",
+};
+#endif
+
 static __init int spawn_ksoftirqd(void)
 {
        register_cpu_notifier(&cpu_nfb);
 
        BUG_ON(smpboot_register_percpu_thread(&softirq_threads));
+#ifdef CONFIG_PREEMPT_RT_FULL
+       BUG_ON(smpboot_register_percpu_thread(&softirq_timer_threads));
+#endif
 
        return 0;
 }
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index a3bbaee77c58..f84d3b45cda7 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -37,7 +37,7 @@ struct cpu_stop_done {
 struct cpu_stopper {
        struct task_struct      *thread;
 
-       spinlock_t              lock;
+       raw_spinlock_t          lock;
        bool                    enabled;        /* is this stopper enabled? */
        struct list_head        works;          /* list of pending works */
 
@@ -86,12 +86,12 @@ static void cpu_stop_queue_work(unsigned int cpu, struct cpu_stop_work *work)
        struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
        unsigned long flags;
 
-       spin_lock_irqsave(&stopper->lock, flags);
+       raw_spin_lock_irqsave(&stopper->lock, flags);
        if (stopper->enabled)
                __cpu_stop_queue_work(stopper, work);
        else
                cpu_stop_signal_done(work->done, false);
-       spin_unlock_irqrestore(&stopper->lock, flags);
+       raw_spin_unlock_irqrestore(&stopper->lock, flags);
 }
 
 /**
@@ -224,8 +224,8 @@ static int cpu_stop_queue_two_works(int cpu1, struct cpu_stop_work *work1,
        int err;
 
        lg_double_lock(&stop_cpus_lock, cpu1, cpu2);
-       spin_lock_irq(&stopper1->lock);
-       spin_lock_nested(&stopper2->lock, SINGLE_DEPTH_NESTING);
+       raw_spin_lock_irq(&stopper1->lock);
+       raw_spin_lock_nested(&stopper2->lock, SINGLE_DEPTH_NESTING);
 
        err = -ENOENT;
        if (!stopper1->enabled || !stopper2->enabled)
@@ -235,8 +235,8 @@ static int cpu_stop_queue_two_works(int cpu1, struct cpu_stop_work *work1,
        __cpu_stop_queue_work(stopper1, work1);
        __cpu_stop_queue_work(stopper2, work2);
 unlock:
-       spin_unlock(&stopper2->lock);
-       spin_unlock_irq(&stopper1->lock);
+       raw_spin_unlock(&stopper2->lock);
+       raw_spin_unlock_irq(&stopper1->lock);
        lg_double_unlock(&stop_cpus_lock, cpu1, cpu2);
 
        return err;
@@ -258,7 +258,7 @@ int stop_two_cpus(unsigned int cpu1, unsigned int cpu2, cpu_stop_fn_t fn, void *
        struct cpu_stop_work work1, work2;
        struct multi_stop_data msdata;
 
-       preempt_disable();
+       preempt_disable_nort();
        msdata = (struct multi_stop_data){
                .fn = fn,
                .data = arg,
@@ -278,11 +278,11 @@ int stop_two_cpus(unsigned int cpu1, unsigned int cpu2, cpu_stop_fn_t fn, void *
        if (cpu1 > cpu2)
                swap(cpu1, cpu2);
        if (cpu_stop_queue_two_works(cpu1, &work1, cpu2, &work2)) {
-               preempt_enable();
+               preempt_enable_nort();
                return -ENOENT;
        }
 
-       preempt_enable();
+       preempt_enable_nort();
 
        wait_for_completion(&done.completion);
 
@@ -315,17 +315,20 @@ static DEFINE_MUTEX(stop_cpus_mutex);
 
 static void queue_stop_cpus_work(const struct cpumask *cpumask,
                                 cpu_stop_fn_t fn, void *arg,
-                                struct cpu_stop_done *done)
+                                struct cpu_stop_done *done, bool inactive)
 {
        struct cpu_stop_work *work;
        unsigned int cpu;
 
        /*
-        * Disable preemption while queueing to avoid getting
-        * preempted by a stopper which might wait for other stoppers
-        * to enter @fn which can lead to deadlock.
+        * Make sure that all work is queued on all cpus before
+        * any of the cpus can execute it.
         */
-       lg_global_lock(&stop_cpus_lock);
+       if (!inactive)
+               lg_global_lock(&stop_cpus_lock);
+       else
+               lg_global_trylock_relax(&stop_cpus_lock);
+
        for_each_cpu(cpu, cpumask) {
                work = &per_cpu(cpu_stopper.stop_work, cpu);
                work->fn = fn;
@@ -342,7 +345,7 @@ static int __stop_cpus(const struct cpumask *cpumask,
        struct cpu_stop_done done;
 
        cpu_stop_init_done(&done, cpumask_weight(cpumask));
-       queue_stop_cpus_work(cpumask, fn, arg, &done);
+       queue_stop_cpus_work(cpumask, fn, arg, &done, false);
        wait_for_completion(&done.completion);
        return done.executed ? done.ret : -ENOENT;
 }
@@ -422,9 +425,9 @@ static int cpu_stop_should_run(unsigned int cpu)
        unsigned long flags;
        int run;
 
-       spin_lock_irqsave(&stopper->lock, flags);
+       raw_spin_lock_irqsave(&stopper->lock, flags);
        run = !list_empty(&stopper->works);
-       spin_unlock_irqrestore(&stopper->lock, flags);
+       raw_spin_unlock_irqrestore(&stopper->lock, flags);
        return run;
 }
 
@@ -436,13 +439,13 @@ static void cpu_stopper_thread(unsigned int cpu)
 
 repeat:
        work = NULL;
-       spin_lock_irq(&stopper->lock);
+       raw_spin_lock_irq(&stopper->lock);
        if (!list_empty(&stopper->works)) {
                work = list_first_entry(&stopper->works,
                                        struct cpu_stop_work, list);
                list_del_init(&work->list);
        }
-       spin_unlock_irq(&stopper->lock);
+       raw_spin_unlock_irq(&stopper->lock);
 
        if (work) {
                cpu_stop_fn_t fn = work->fn;
@@ -450,6 +453,16 @@ static void cpu_stopper_thread(unsigned int cpu)
                struct cpu_stop_done *done = work->done;
                char ksym_buf[KSYM_NAME_LEN] __maybe_unused;
 
+               /*
+                * Wait until the stopper finished scheduling on all
+                * cpus
+                */
+               lg_global_lock(&stop_cpus_lock);
+               /*
+                * Let other cpu threads continue as well
+                */
+               lg_global_unlock(&stop_cpus_lock);
+
                /* cpu stop callbacks are not allowed to sleep */
                preempt_disable();
 
@@ -520,10 +533,12 @@ static int __init cpu_stop_init(void)
        for_each_possible_cpu(cpu) {
                struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
 
-               spin_lock_init(&stopper->lock);
+               raw_spin_lock_init(&stopper->lock);
                INIT_LIST_HEAD(&stopper->works);
        }
 
+       lg_lock_init(&stop_cpus_lock, "stop_cpus_lock");
+
        BUG_ON(smpboot_register_percpu_thread(&cpu_stop_threads));
        stop_machine_unpark(raw_smp_processor_id());
        stop_machine_initialized = true;
@@ -620,7 +635,7 @@ int stop_machine_from_inactive_cpu(cpu_stop_fn_t fn, void *data,
        set_state(&msdata, MULTI_STOP_PREPARE);
        cpu_stop_init_done(&done, num_active_cpus());
        queue_stop_cpus_work(cpu_active_mask, multi_cpu_stop, &msdata,
-                            &done);
+                            &done, true);
        ret = multi_cpu_stop(&msdata);
 
        /* Busy wait for completion. */
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 17f7bcff1e02..120fc8932165 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -48,11 +48,13 @@
 #include <linux/sched/rt.h>
 #include <linux/sched/deadline.h>
 #include <linux/timer.h>
+#include <linux/kthread.h>
 #include <linux/freezer.h>
 
 #include <asm/uaccess.h>
 
 #include <trace/events/timer.h>
+#include <trace/events/hist.h>
 
 #include "tick-internal.h"
 
@@ -717,6 +719,44 @@ static void clock_was_set_work(struct work_struct *work)
 
 static DECLARE_WORK(hrtimer_work, clock_was_set_work);
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+/*
+ * RT can not call schedule_work from real interrupt context.
+ * Need to make a thread to do the real work.
+ */
+static struct task_struct *clock_set_delay_thread;
+static bool do_clock_set_delay;
+
+static int run_clock_set_delay(void *ignore)
+{
+       while (!kthread_should_stop()) {
+               set_current_state(TASK_INTERRUPTIBLE);
+               if (do_clock_set_delay) {
+                       do_clock_set_delay = false;
+                       schedule_work(&hrtimer_work);
+               }
+               schedule();
+       }
+       __set_current_state(TASK_RUNNING);
+       return 0;
+}
+
+void clock_was_set_delayed(void)
+{
+       do_clock_set_delay = true;
+       /* Make visible before waking up process */
+       smp_wmb();
+       wake_up_process(clock_set_delay_thread);
+}
+
+static __init int create_clock_set_delay_thread(void)
+{
+       clock_set_delay_thread = kthread_run(run_clock_set_delay, NULL, "kclksetdelayd");
+       BUG_ON(!clock_set_delay_thread);
+       return 0;
+}
+early_initcall(create_clock_set_delay_thread);
+#else /* PREEMPT_RT_FULL */
 /*
  * Called from timekeeping and resume code to reprogramm the hrtimer
  * interrupt device on all cpus.
@@ -725,6 +765,7 @@ void clock_was_set_delayed(void)
 {
        schedule_work(&hrtimer_work);
 }
+#endif
 
 #else
 
@@ -734,11 +775,8 @@ static inline int hrtimer_is_hres_enabled(void) { return 0; }
 static inline void hrtimer_switch_to_hres(void) { }
 static inline void
 hrtimer_force_reprogram(struct hrtimer_cpu_base *base, int skip_equal) { }
-static inline int hrtimer_reprogram(struct hrtimer *timer,
-                                   struct hrtimer_clock_base *base)
-{
-       return 0;
-}
+static inline void hrtimer_reprogram(struct hrtimer *timer,
+                                    struct hrtimer_clock_base *base) { }
 static inline void hrtimer_init_hres(struct hrtimer_cpu_base *base) { }
 static inline void retrigger_next_event(void *arg) { }
 
@@ -870,6 +908,32 @@ u64 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
 }
 EXPORT_SYMBOL_GPL(hrtimer_forward);
 
+#ifdef CONFIG_PREEMPT_RT_BASE
+# define wake_up_timer_waiters(b)      wake_up(&(b)->wait)
+
+/**
+ * hrtimer_wait_for_timer - Wait for a running timer
+ *
+ * @timer:     timer to wait for
+ *
+ * The function waits in case the timers callback function is
+ * currently executed on the waitqueue of the timer base. The
+ * waitqueue is woken up after the timer callback function has
+ * finished execution.
+ */
+void hrtimer_wait_for_timer(const struct hrtimer *timer)
+{
+       struct hrtimer_clock_base *base = timer->base;
+
+       if (base && base->cpu_base && !timer->irqsafe)
+               wait_event(base->cpu_base->wait,
+                               !(hrtimer_callback_running(timer)));
+}
+
+#else
+# define wake_up_timer_waiters(b)      do { } while (0)
+#endif
+
 /*
  * enqueue_hrtimer - internal function to (re)start a timer
  *
@@ -911,6 +975,11 @@ static void __remove_hrtimer(struct hrtimer *timer,
        if (!(state & HRTIMER_STATE_ENQUEUED))
                return;
 
+       if (unlikely(!list_empty(&timer->cb_entry))) {
+               list_del_init(&timer->cb_entry);
+               return;
+       }
+
        if (!timerqueue_del(&base->active, &timer->node))
                cpu_base->active_bases &= ~(1 << base->index);
 
@@ -1006,7 +1075,16 @@ void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
        new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);
 
        timer_stats_hrtimer_set_start_info(timer);
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+       {
+               ktime_t now = new_base->get_time();
 
+               if (ktime_to_ns(tim) < ktime_to_ns(now))
+                       timer->praecox = now;
+               else
+                       timer->praecox = ktime_set(0, 0);
+       }
+#endif
        leftmost = enqueue_hrtimer(timer, new_base);
        if (!leftmost)
                goto unlock;
@@ -1078,7 +1156,7 @@ int hrtimer_cancel(struct hrtimer *timer)
 
                if (ret >= 0)
                        return ret;
-               cpu_relax();
+               hrtimer_wait_for_timer(timer);
        }
 }
 EXPORT_SYMBOL_GPL(hrtimer_cancel);
@@ -1142,6 +1220,7 @@ static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id,
 
        base = hrtimer_clockid_to_base(clock_id);
        timer->base = &cpu_base->clock_base[base];
+       INIT_LIST_HEAD(&timer->cb_entry);
        timerqueue_init(&timer->node);
 
 #ifdef CONFIG_TIMER_STATS
@@ -1182,6 +1261,7 @@ bool hrtimer_active(const struct hrtimer *timer)
                seq = raw_read_seqcount_begin(&cpu_base->seq);
 
                if (timer->state != HRTIMER_STATE_INACTIVE ||
+                   cpu_base->running_soft == timer ||
                    cpu_base->running == timer)
                        return true;
 
@@ -1280,10 +1360,112 @@ static void __run_hrtimer(struct hrtimer_cpu_base *cpu_base,
        cpu_base->running = NULL;
 }
 
-static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now)
+#ifdef CONFIG_PREEMPT_RT_BASE
+static void hrtimer_rt_reprogram(int restart, struct hrtimer *timer,
+                                struct hrtimer_clock_base *base)
+{
+       int leftmost;
+
+       if (restart != HRTIMER_NORESTART &&
+           !(timer->state & HRTIMER_STATE_ENQUEUED)) {
+
+               leftmost = enqueue_hrtimer(timer, base);
+               if (!leftmost)
+                       return;
+#ifdef CONFIG_HIGH_RES_TIMERS
+               if (!hrtimer_is_hres_active(timer)) {
+                       /*
+                        * Kick to reschedule the next tick to handle the new timer
+                        * on dynticks target.
+                        */
+                       if (base->cpu_base->nohz_active)
+                               wake_up_nohz_cpu(base->cpu_base->cpu);
+               } else {
+
+                       hrtimer_reprogram(timer, base);
+               }
+#endif
+       }
+}
+
+/*
+ * The changes in mainline which removed the callback modes from
+ * hrtimer are not yet working with -rt. The non wakeup_process()
+ * based callbacks which involve sleeping locks need to be treated
+ * seperately.
+ */
+static void hrtimer_rt_run_pending(void)
+{
+       enum hrtimer_restart (*fn)(struct hrtimer *);
+       struct hrtimer_cpu_base *cpu_base;
+       struct hrtimer_clock_base *base;
+       struct hrtimer *timer;
+       int index, restart;
+
+       local_irq_disable();
+       cpu_base = &per_cpu(hrtimer_bases, smp_processor_id());
+
+       raw_spin_lock(&cpu_base->lock);
+
+       for (index = 0; index < HRTIMER_MAX_CLOCK_BASES; index++) {
+               base = &cpu_base->clock_base[index];
+
+               while (!list_empty(&base->expired)) {
+                       timer = list_first_entry(&base->expired,
+                                                struct hrtimer, cb_entry);
+
+                       /*
+                        * Same as the above __run_hrtimer function
+                        * just we run with interrupts enabled.
+                        */
+                       debug_deactivate(timer);
+                       cpu_base->running_soft = timer;
+                       raw_write_seqcount_barrier(&cpu_base->seq);
+
+                       __remove_hrtimer(timer, base, HRTIMER_STATE_INACTIVE, 0);
+                       timer_stats_account_hrtimer(timer);
+                       fn = timer->function;
+
+                       raw_spin_unlock_irq(&cpu_base->lock);
+                       restart = fn(timer);
+                       raw_spin_lock_irq(&cpu_base->lock);
+
+                       hrtimer_rt_reprogram(restart, timer, base);
+                       raw_write_seqcount_barrier(&cpu_base->seq);
+
+                       WARN_ON_ONCE(cpu_base->running_soft != timer);
+                       cpu_base->running_soft = NULL;
+               }
+       }
+
+       raw_spin_unlock_irq(&cpu_base->lock);
+
+       wake_up_timer_waiters(cpu_base);
+}
+
+static int hrtimer_rt_defer(struct hrtimer *timer)
+{
+       if (timer->irqsafe)
+               return 0;
+
+       __remove_hrtimer(timer, timer->base, timer->state, 0);
+       list_add_tail(&timer->cb_entry, &timer->base->expired);
+       return 1;
+}
+
+#else
+
+static inline int hrtimer_rt_defer(struct hrtimer *timer) { return 0; }
+
+#endif
+
+static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer);
+
+static int __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now)
 {
        struct hrtimer_clock_base *base = cpu_base->clock_base;
        unsigned int active = cpu_base->active_bases;
+       int raise = 0;
 
        for (; active; base++, active >>= 1) {
                struct timerqueue_node *node;
@@ -1299,6 +1481,15 @@ static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now)
 
                        timer = container_of(node, struct hrtimer, node);
 
+                       trace_hrtimer_interrupt(raw_smp_processor_id(),
+                           ktime_to_ns(ktime_sub(ktime_to_ns(timer->praecox) ?
+                               timer->praecox : hrtimer_get_expires(timer),
+                               basenow)),
+                           current,
+                           timer->function == hrtimer_wakeup ?
+                           container_of(timer, struct hrtimer_sleeper,
+                               timer)->task : NULL);
+
                        /*
                         * The immediate goal for using the softexpires is
                         * minimizing wakeups, not running timers at the
@@ -1314,9 +1505,13 @@ static void __hrtimer_run_queues(struct hrtimer_cpu_base *cpu_base, ktime_t now)
                        if (basenow.tv64 < hrtimer_get_softexpires_tv64(timer))
                                break;
 
-                       __run_hrtimer(cpu_base, base, timer, &basenow);
+                       if (!hrtimer_rt_defer(timer))
+                               __run_hrtimer(cpu_base, base, timer, &basenow);
+                       else
+                               raise = 1;
                }
        }
+       return raise;
 }
 
 #ifdef CONFIG_HIGH_RES_TIMERS
@@ -1330,6 +1525,7 @@ void hrtimer_interrupt(struct clock_event_device *dev)
        struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
        ktime_t expires_next, now, entry_time, delta;
        int retries = 0;
+       int raise;
 
        BUG_ON(!cpu_base->hres_active);
        cpu_base->nr_events++;
@@ -1348,7 +1544,7 @@ void hrtimer_interrupt(struct clock_event_device *dev)
         */
        cpu_base->expires_next.tv64 = KTIME_MAX;
 
-       __hrtimer_run_queues(cpu_base, now);
+       raise = __hrtimer_run_queues(cpu_base, now);
 
        /* Reevaluate the clock bases for the next expiry */
        expires_next = __hrtimer_get_next_event(cpu_base);
@@ -1359,6 +1555,8 @@ void hrtimer_interrupt(struct clock_event_device *dev)
        cpu_base->expires_next = expires_next;
        cpu_base->in_hrtirq = 0;
        raw_spin_unlock(&cpu_base->lock);
+       if (raise)
+               raise_softirq_irqoff(HRTIMER_SOFTIRQ);
 
        /* Reprogramming necessary ? */
        if (!tick_program_event(expires_next, 0)) {
@@ -1438,6 +1636,7 @@ void hrtimer_run_queues(void)
 {
        struct hrtimer_cpu_base *cpu_base = this_cpu_ptr(&hrtimer_bases);
        ktime_t now;
+       int raise;
 
        if (__hrtimer_hres_active(cpu_base))
                return;
@@ -1456,8 +1655,10 @@ void hrtimer_run_queues(void)
 
        raw_spin_lock(&cpu_base->lock);
        now = hrtimer_update_base(cpu_base);
-       __hrtimer_run_queues(cpu_base, now);
+       raise = __hrtimer_run_queues(cpu_base, now);
        raw_spin_unlock(&cpu_base->lock);
+       if (raise)
+               raise_softirq_irqoff(HRTIMER_SOFTIRQ);
 }
 
 /*
@@ -1479,16 +1680,18 @@ static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer)
 void hrtimer_init_sleeper(struct hrtimer_sleeper *sl, struct task_struct *task)
 {
        sl->timer.function = hrtimer_wakeup;
+       sl->timer.irqsafe = 1;
        sl->task = task;
 }
 EXPORT_SYMBOL_GPL(hrtimer_init_sleeper);
 
-static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
+static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode,
+                               unsigned long state)
 {
        hrtimer_init_sleeper(t, current);
 
        do {
-               set_current_state(TASK_INTERRUPTIBLE);
+               set_current_state(state);
                hrtimer_start_expires(&t->timer, mode);
 
                if (likely(t->task))
@@ -1530,7 +1733,8 @@ long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
                                HRTIMER_MODE_ABS);
        hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires);
 
-       if (do_nanosleep(&t, HRTIMER_MODE_ABS))
+       /* cpu_chill() does not care about restart state. */
+       if (do_nanosleep(&t, HRTIMER_MODE_ABS, TASK_INTERRUPTIBLE))
                goto out;
 
        rmtp = restart->nanosleep.rmtp;
@@ -1547,8 +1751,10 @@ long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
        return ret;
 }
 
-long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
-                      const enum hrtimer_mode mode, const clockid_t clockid)
+static long
+__hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
+                   const enum hrtimer_mode mode, const clockid_t clockid,
+                   unsigned long state)
 {
        struct restart_block *restart;
        struct hrtimer_sleeper t;
@@ -1561,7 +1767,7 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
 
        hrtimer_init_on_stack(&t.timer, clockid, mode);
        hrtimer_set_expires_range_ns(&t.timer, timespec_to_ktime(*rqtp), slack);
-       if (do_nanosleep(&t, mode))
+       if (do_nanosleep(&t, mode, state))
                goto out;
 
        /* Absolute timers do not update the rmtp value and restart: */
@@ -1588,6 +1794,12 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
        return ret;
 }
 
+long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
+                      const enum hrtimer_mode mode, const clockid_t clockid)
+{
+       return __hrtimer_nanosleep(rqtp, rmtp, mode, clockid, TASK_INTERRUPTIBLE);
+}
+
 SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
                struct timespec __user *, rmtp)
 {
@@ -1602,6 +1814,26 @@ SYSCALL_DEFINE2(nanosleep, struct timespec __user *, rqtp,
        return hrtimer_nanosleep(&tu, rmtp, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
 }
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+/*
+ * Sleep for 1 ms in hope whoever holds what we want will let it go.
+ */
+void cpu_chill(void)
+{
+       struct timespec tu = {
+               .tv_nsec = NSEC_PER_MSEC,
+       };
+       unsigned int freeze_flag = current->flags & PF_NOFREEZE;
+
+       current->flags |= PF_NOFREEZE;
+       __hrtimer_nanosleep(&tu, NULL, HRTIMER_MODE_REL, CLOCK_MONOTONIC,
+                           TASK_UNINTERRUPTIBLE);
+       if (!freeze_flag)
+               current->flags &= ~PF_NOFREEZE;
+}
+EXPORT_SYMBOL(cpu_chill);
+#endif
+
 /*
  * Functions related to boot-time initialization:
  */
@@ -1613,15 +1845,19 @@ static void init_hrtimers_cpu(int cpu)
        for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
                cpu_base->clock_base[i].cpu_base = cpu_base;
                timerqueue_init_head(&cpu_base->clock_base[i].active);
+               INIT_LIST_HEAD(&cpu_base->clock_base[i].expired);
        }
 
        cpu_base->cpu = cpu;
        hrtimer_init_hres(cpu_base);
+#ifdef CONFIG_PREEMPT_RT_BASE
+       init_waitqueue_head(&cpu_base->wait);
+#endif
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
 
-static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
+static int migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
                                struct hrtimer_clock_base *new_base)
 {
        struct hrtimer *timer;
@@ -1649,12 +1885,21 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
                 */
                enqueue_hrtimer(timer, new_base);
        }
+#ifdef CONFIG_PREEMPT_RT_BASE
+       list_splice_tail(&old_base->expired, &new_base->expired);
+       /*
+        * Tell the caller to raise HRTIMER_SOFTIRQ.  We can't safely
+        * acquire ktimersoftd->pi_lock while the base lock is held.
+        */
+       return !list_empty(&new_base->expired);
+#endif
+       return 0;
 }
 
 static void migrate_hrtimers(int scpu)
 {
        struct hrtimer_cpu_base *old_base, *new_base;
-       int i;
+       int i, raise = 0;
 
        BUG_ON(cpu_online(scpu));
        tick_cancel_sched_timer(scpu);
@@ -1670,13 +1915,16 @@ static void migrate_hrtimers(int scpu)
        raw_spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
 
        for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
-               migrate_hrtimer_list(&old_base->clock_base[i],
-                                    &new_base->clock_base[i]);
+               raise |= migrate_hrtimer_list(&old_base->clock_base[i],
+                                             &new_base->clock_base[i]);
        }
 
        raw_spin_unlock(&old_base->lock);
        raw_spin_unlock(&new_base->lock);
 
+       if (raise)
+               raise_softirq_irqoff(HRTIMER_SOFTIRQ);
+
        /* Check, if we got expired work to do */
        __hrtimer_peek_ahead_timers();
        local_irq_enable();
@@ -1714,11 +1962,21 @@ static struct notifier_block hrtimers_nb = {
        .notifier_call = hrtimer_cpu_notify,
 };
 
+#ifdef CONFIG_PREEMPT_RT_BASE
+static void run_hrtimer_softirq(struct softirq_action *h)
+{
+       hrtimer_rt_run_pending();
+}
+#endif
+
 void __init hrtimers_init(void)
 {
        hrtimer_cpu_notify(&hrtimers_nb, (unsigned long)CPU_UP_PREPARE,
                          (void *)(long)smp_processor_id());
        register_cpu_notifier(&hrtimers_nb);
+#ifdef CONFIG_PREEMPT_RT_BASE
+       open_softirq(HRTIMER_SOFTIRQ, run_hrtimer_softirq);
+#endif
 }
 
 /**
diff --git a/kernel/time/itimer.c b/kernel/time/itimer.c
index 1d5c7204ddc9..184de6751180 100644
--- a/kernel/time/itimer.c
+++ b/kernel/time/itimer.c
@@ -213,6 +213,7 @@ int do_setitimer(int which, struct itimerval *value, struct itimerval *ovalue)
                /* We are sharing ->siglock with it_real_fn() */
                if (hrtimer_try_to_cancel(timer) < 0) {
                        spin_unlock_irq(&tsk->sighand->siglock);
+                       hrtimer_wait_for_timer(&tsk->signal->real_timer);
                        goto again;
                }
                expires = timeval_to_ktime(value->it_value);
diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
index 347fecf86a3f..2ede47408a3e 100644
--- a/kernel/time/jiffies.c
+++ b/kernel/time/jiffies.c
@@ -74,7 +74,8 @@ static struct clocksource clocksource_jiffies = {
        .max_cycles     = 10,
 };
 
-__cacheline_aligned_in_smp DEFINE_SEQLOCK(jiffies_lock);
+__cacheline_aligned_in_smp DEFINE_RAW_SPINLOCK(jiffies_lock);
+__cacheline_aligned_in_smp seqcount_t jiffies_seq;
 
 #if (BITS_PER_LONG < 64)
 u64 get_jiffies_64(void)
@@ -83,9 +84,9 @@ u64 get_jiffies_64(void)
        u64 ret;
 
        do {
-               seq = read_seqbegin(&jiffies_lock);
+               seq = read_seqcount_begin(&jiffies_seq);
                ret = jiffies_64;
-       } while (read_seqretry(&jiffies_lock, seq));
+       } while (read_seqcount_retry(&jiffies_seq, seq));
        return ret;
 }
 EXPORT_SYMBOL(get_jiffies_64);
diff --git a/kernel/time/ntp.c b/kernel/time/ntp.c
index ab861771e37f..0f6868fd2de6 100644
--- a/kernel/time/ntp.c
+++ b/kernel/time/ntp.c
@@ -10,6 +10,7 @@
 #include <linux/workqueue.h>
 #include <linux/hrtimer.h>
 #include <linux/jiffies.h>
+#include <linux/kthread.h>
 #include <linux/math64.h>
 #include <linux/timex.h>
 #include <linux/time.h>
@@ -562,10 +563,52 @@ static void sync_cmos_clock(struct work_struct *work)
                           &sync_cmos_work, timespec64_to_jiffies(&next));
 }
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+/*
+ * RT can not call schedule_delayed_work from real interrupt context.
+ * Need to make a thread to do the real work.
+ */
+static struct task_struct *cmos_delay_thread;
+static bool do_cmos_delay;
+
+static int run_cmos_delay(void *ignore)
+{
+       while (!kthread_should_stop()) {
+               set_current_state(TASK_INTERRUPTIBLE);
+               if (do_cmos_delay) {
+                       do_cmos_delay = false;
+                       queue_delayed_work(system_power_efficient_wq,
+                                          &sync_cmos_work, 0);
+               }
+               schedule();
+       }
+       __set_current_state(TASK_RUNNING);
+       return 0;
+}
+
+void ntp_notify_cmos_timer(void)
+{
+       do_cmos_delay = true;
+       /* Make visible before waking up process */
+       smp_wmb();
+       wake_up_process(cmos_delay_thread);
+}
+
+static __init int create_cmos_delay_thread(void)
+{
+       cmos_delay_thread = kthread_run(run_cmos_delay, NULL, "kcmosdelayd");
+       BUG_ON(!cmos_delay_thread);
+       return 0;
+}
+early_initcall(create_cmos_delay_thread);
+
+#else
+
 void ntp_notify_cmos_timer(void)
 {
        queue_delayed_work(system_power_efficient_wq, &sync_cmos_work, 0);
 }
+#endif /* CONFIG_PREEMPT_RT_FULL */
 
 #else
 void ntp_notify_cmos_timer(void) { }
diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 80016b329d94..b7342b6e6a5a 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -3,6 +3,7 @@
  */
 
 #include <linux/sched.h>
+#include <linux/sched/rt.h>
 #include <linux/posix-timers.h>
 #include <linux/errno.h>
 #include <linux/math64.h>
@@ -650,7 +651,7 @@ static int posix_cpu_timer_set(struct k_itimer *timer, int timer_flags,
        /*
         * Disarm any old timer after extracting its expiry time.
         */
-       WARN_ON_ONCE(!irqs_disabled());
+       WARN_ON_ONCE_NONRT(!irqs_disabled());
 
        ret = 0;
        old_incr = timer->it.cpu.incr;
@@ -1092,7 +1093,7 @@ void posix_cpu_timer_schedule(struct k_itimer *timer)
        /*
         * Now re-arm for the new expiry time.
         */
-       WARN_ON_ONCE(!irqs_disabled());
+       WARN_ON_ONCE_NONRT(!irqs_disabled());
        arm_timer(timer);
        unlock_task_sighand(p, &flags);
 
@@ -1183,13 +1184,13 @@ static inline int fastpath_timer_check(struct task_struct *tsk)
  * already updated our counts.  We need to check if any timers fire now.
  * Interrupts are disabled.
  */
-void run_posix_cpu_timers(struct task_struct *tsk)
+static void __run_posix_cpu_timers(struct task_struct *tsk)
 {
        LIST_HEAD(firing);
        struct k_itimer *timer, *next;
        unsigned long flags;
 
-       WARN_ON_ONCE(!irqs_disabled());
+       WARN_ON_ONCE_NONRT(!irqs_disabled());
 
        /*
         * The fast path checks that there are no expired thread or thread
@@ -1243,6 +1244,190 @@ void run_posix_cpu_timers(struct task_struct *tsk)
        }
 }
 
+#ifdef CONFIG_PREEMPT_RT_BASE
+#include <linux/kthread.h>
+#include <linux/cpu.h>
+DEFINE_PER_CPU(struct task_struct *, posix_timer_task);
+DEFINE_PER_CPU(struct task_struct *, posix_timer_tasklist);
+
+static int posix_cpu_timers_thread(void *data)
+{
+       int cpu = (long)data;
+
+       BUG_ON(per_cpu(posix_timer_task,cpu) != current);
+
+       while (!kthread_should_stop()) {
+               struct task_struct *tsk = NULL;
+               struct task_struct *next = NULL;
+
+               if (cpu_is_offline(cpu))
+                       goto wait_to_die;
+
+               /* grab task list */
+               raw_local_irq_disable();
+               tsk = per_cpu(posix_timer_tasklist, cpu);
+               per_cpu(posix_timer_tasklist, cpu) = NULL;
+               raw_local_irq_enable();
+
+               /* its possible the list is empty, just return */
+               if (!tsk) {
+                       set_current_state(TASK_INTERRUPTIBLE);
+                       schedule();
+                       __set_current_state(TASK_RUNNING);
+                       continue;
+               }
+
+               /* Process task list */
+               while (1) {
+                       /* save next */
+                       next = tsk->posix_timer_list;
+
+                       /* run the task timers, clear its ptr and
+                        * unreference it
+                        */
+                       __run_posix_cpu_timers(tsk);
+                       tsk->posix_timer_list = NULL;
+                       put_task_struct(tsk);
+
+                       /* check if this is the last on the list */
+                       if (next == tsk)
+                               break;
+                       tsk = next;
+               }
+       }
+       return 0;
+
+wait_to_die:
+       /* Wait for kthread_stop */
+       set_current_state(TASK_INTERRUPTIBLE);
+       while (!kthread_should_stop()) {
+               schedule();
+               set_current_state(TASK_INTERRUPTIBLE);
+       }
+       __set_current_state(TASK_RUNNING);
+       return 0;
+}
+
+static inline int __fastpath_timer_check(struct task_struct *tsk)
+{
+       /* tsk == current, ensure it is safe to use ->signal/sighand */
+       if (unlikely(tsk->exit_state))
+               return 0;
+
+       if (!task_cputime_zero(&tsk->cputime_expires))
+                       return 1;
+
+       if (!task_cputime_zero(&tsk->signal->cputime_expires))
+                       return 1;
+
+       return 0;
+}
+
+void run_posix_cpu_timers(struct task_struct *tsk)
+{
+       unsigned long cpu = smp_processor_id();
+       struct task_struct *tasklist;
+
+       BUG_ON(!irqs_disabled());
+       if(!per_cpu(posix_timer_task, cpu))
+               return;
+       /* get per-cpu references */
+       tasklist = per_cpu(posix_timer_tasklist, cpu);
+
+       /* check to see if we're already queued */
+       if (!tsk->posix_timer_list && __fastpath_timer_check(tsk)) {
+               get_task_struct(tsk);
+               if (tasklist) {
+                       tsk->posix_timer_list = tasklist;
+               } else {
+                       /*
+                        * The list is terminated by a self-pointing
+                        * task_struct
+                        */
+                       tsk->posix_timer_list = tsk;
+               }
+               per_cpu(posix_timer_tasklist, cpu) = tsk;
+
+               wake_up_process(per_cpu(posix_timer_task, cpu));
+       }
+}
+
+/*
+ * posix_cpu_thread_call - callback that gets triggered when a CPU is added.
+ * Here we can start up the necessary migration thread for the new CPU.
+ */
+static int posix_cpu_thread_call(struct notifier_block *nfb,
+                                unsigned long action, void *hcpu)
+{
+       int cpu = (long)hcpu;
+       struct task_struct *p;
+       struct sched_param param;
+
+       switch (action) {
+       case CPU_UP_PREPARE:
+               p = kthread_create(posix_cpu_timers_thread, hcpu,
+                                       "posixcputmr/%d",cpu);
+               if (IS_ERR(p))
+                       return NOTIFY_BAD;
+               p->flags |= PF_NOFREEZE;
+               kthread_bind(p, cpu);
+               /* Must be high prio to avoid getting starved */
+               param.sched_priority = MAX_RT_PRIO-1;
+               sched_setscheduler(p, SCHED_FIFO, &param);
+               per_cpu(posix_timer_task,cpu) = p;
+               break;
+       case CPU_ONLINE:
+               /* Strictly unneccessary, as first user will wake it. */
+               wake_up_process(per_cpu(posix_timer_task,cpu));
+               break;
+#ifdef CONFIG_HOTPLUG_CPU
+       case CPU_UP_CANCELED:
+               /* Unbind it from offline cpu so it can run.  Fall thru. */
+               kthread_bind(per_cpu(posix_timer_task, cpu),
+                            cpumask_any(cpu_online_mask));
+               kthread_stop(per_cpu(posix_timer_task,cpu));
+               per_cpu(posix_timer_task,cpu) = NULL;
+               break;
+       case CPU_DEAD:
+               kthread_stop(per_cpu(posix_timer_task,cpu));
+               per_cpu(posix_timer_task,cpu) = NULL;
+               break;
+#endif
+       }
+       return NOTIFY_OK;
+}
+
+/* Register at highest priority so that task migration (migrate_all_tasks)
+ * happens before everything else.
+ */
+static struct notifier_block posix_cpu_thread_notifier = {
+       .notifier_call = posix_cpu_thread_call,
+       .priority = 10
+};
+
+static int __init posix_cpu_thread_init(void)
+{
+       void *hcpu = (void *)(long)smp_processor_id();
+       /* Start one for boot CPU. */
+       unsigned long cpu;
+
+       /* init the per-cpu posix_timer_tasklets */
+       for_each_possible_cpu(cpu)
+               per_cpu(posix_timer_tasklist, cpu) = NULL;
+
+       posix_cpu_thread_call(&posix_cpu_thread_notifier, CPU_UP_PREPARE, hcpu);
+       posix_cpu_thread_call(&posix_cpu_thread_notifier, CPU_ONLINE, hcpu);
+       register_cpu_notifier(&posix_cpu_thread_notifier);
+       return 0;
+}
+early_initcall(posix_cpu_thread_init);
+#else /* CONFIG_PREEMPT_RT_BASE */
+void run_posix_cpu_timers(struct task_struct *tsk)
+{
+       __run_posix_cpu_timers(tsk);
+}
+#endif /* CONFIG_PREEMPT_RT_BASE */
+
 /*
  * Set one of the process-wide special case CPU timers or RLIMIT_CPU.
  * The tsk->sighand->siglock must be held by the caller.
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index f2826c35e918..464a98155a0e 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -506,6 +506,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
 static struct pid *good_sigevent(sigevent_t * event)
 {
        struct task_struct *rtn = current->group_leader;
+       int sig = event->sigev_signo;
 
        if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
                (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) ||
@@ -514,7 +515,8 @@ static struct pid *good_sigevent(sigevent_t * event)
                return NULL;
 
        if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) &&
-           ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
+           (sig <= 0 || sig > SIGRTMAX || sig_kernel_only(sig) ||
+            sig_kernel_coredump(sig)))
                return NULL;
 
        return task_pid(rtn);
@@ -826,6 +828,20 @@ SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id)
        return overrun;
 }
 
+/*
+ * Protected by RCU!
+ */
+static void timer_wait_for_callback(struct k_clock *kc, struct k_itimer *timr)
+{
+#ifdef CONFIG_PREEMPT_RT_FULL
+       if (kc->timer_set == common_timer_set)
+               hrtimer_wait_for_timer(&timr->it.real.timer);
+       else
+               /* FIXME: Whacky hack for posix-cpu-timers */
+               schedule_timeout(1);
+#endif
+}
+
 /* Set a POSIX.1b interval timer. */
 /* timr->it_lock is taken. */
 static int
@@ -903,6 +919,7 @@ SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
        if (!timr)
                return -EINVAL;
 
+       rcu_read_lock();
        kc = clockid_to_kclock(timr->it_clock);
        if (WARN_ON_ONCE(!kc || !kc->timer_set))
                error = -EINVAL;
@@ -911,9 +928,12 @@ SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags,
 
        unlock_timer(timr, flag);
        if (error == TIMER_RETRY) {
+               timer_wait_for_callback(kc, timr);
                rtn = NULL;     // We already got the old time...
+               rcu_read_unlock();
                goto retry;
        }
+       rcu_read_unlock();
 
        if (old_setting && !error &&
            copy_to_user(old_setting, &old_spec, sizeof (old_spec)))
@@ -951,10 +971,15 @@ SYSCALL_DEFINE1(timer_delete, timer_t, timer_id)
        if (!timer)
                return -EINVAL;
 
+       rcu_read_lock();
        if (timer_delete_hook(timer) == TIMER_RETRY) {
                unlock_timer(timer, flags);
+               timer_wait_for_callback(clockid_to_kclock(timer->it_clock),
+                                       timer);
+               rcu_read_unlock();
                goto retry_delete;
        }
+       rcu_read_unlock();
 
        spin_lock(&current->sighand->siglock);
        list_del(&timer->list);
@@ -980,8 +1005,18 @@ static void itimer_delete(struct k_itimer *timer)
 retry_delete:
        spin_lock_irqsave(&timer->it_lock, flags);
 
+       /* On RT we can race with a deletion */
+       if (!timer->it_signal) {
+               unlock_timer(timer, flags);
+               return;
+       }
+
        if (timer_delete_hook(timer) == TIMER_RETRY) {
+               rcu_read_lock();
                unlock_timer(timer, flags);
+               timer_wait_for_callback(clockid_to_kclock(timer->it_clock),
+                                       timer);
+               rcu_read_unlock();
                goto retry_delete;
        }
        list_del(&timer->list);
diff --git a/kernel/time/tick-broadcast-hrtimer.c b/kernel/time/tick-broadcast-hrtimer.c
index 53d7184da0be..1b4ac3361c3f 100644
--- a/kernel/time/tick-broadcast-hrtimer.c
+++ b/kernel/time/tick-broadcast-hrtimer.c
@@ -106,5 +106,6 @@ void tick_setup_hrtimer_broadcast(void)
 {
        hrtimer_init(&bctimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
        bctimer.function = bc_handler;
+       bctimer.irqsafe = true;
        clockevents_register_device(&ce_broadcast_hrtimer);
 }
diff --git a/kernel/time/tick-common.c b/kernel/time/tick-common.c
index 4fcd99e12aa0..5a47f2e98faf 100644
--- a/kernel/time/tick-common.c
+++ b/kernel/time/tick-common.c
@@ -79,13 +79,15 @@ int tick_is_oneshot_available(void)
 static void tick_periodic(int cpu)
 {
        if (tick_do_timer_cpu == cpu) {
-               write_seqlock(&jiffies_lock);
+               raw_spin_lock(&jiffies_lock);
+               write_seqcount_begin(&jiffies_seq);
 
                /* Keep track of the next tick event */
                tick_next_period = ktime_add(tick_next_period, tick_period);
 
                do_timer(1);
-               write_sequnlock(&jiffies_lock);
+               write_seqcount_end(&jiffies_seq);
+               raw_spin_unlock(&jiffies_lock);
                update_wall_time();
        }
 
@@ -157,9 +159,9 @@ void tick_setup_periodic(struct clock_event_device *dev, int broadcast)
                ktime_t next;
 
                do {
-                       seq = read_seqbegin(&jiffies_lock);
+                       seq = read_seqcount_begin(&jiffies_seq);
                        next = tick_next_period;
-               } while (read_seqretry(&jiffies_lock, seq));
+               } while (read_seqcount_retry(&jiffies_seq, seq));
 
                clockevents_switch_state(dev, CLOCK_EVT_STATE_ONESHOT);
 
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index e5d228f7224c..45e9456da50f 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -62,7 +62,8 @@ static void tick_do_update_jiffies64(ktime_t now)
                return;
 
        /* Reevalute with jiffies_lock held */
-       write_seqlock(&jiffies_lock);
+       raw_spin_lock(&jiffies_lock);
+       write_seqcount_begin(&jiffies_seq);
 
        delta = ktime_sub(now, last_jiffies_update);
        if (delta.tv64 >= tick_period.tv64) {
@@ -85,10 +86,12 @@ static void tick_do_update_jiffies64(ktime_t now)
                /* Keep the tick_next_period variable up to date */
                tick_next_period = ktime_add(last_jiffies_update, tick_period);
        } else {
-               write_sequnlock(&jiffies_lock);
+               write_seqcount_end(&jiffies_seq);
+               raw_spin_unlock(&jiffies_lock);
                return;
        }
-       write_sequnlock(&jiffies_lock);
+       write_seqcount_end(&jiffies_seq);
+       raw_spin_unlock(&jiffies_lock);
        update_wall_time();
 }
 
@@ -99,12 +102,14 @@ static ktime_t tick_init_jiffy_update(void)
 {
        ktime_t period;
 
-       write_seqlock(&jiffies_lock);
+       raw_spin_lock(&jiffies_lock);
+       write_seqcount_begin(&jiffies_seq);
        /* Did we start the jiffies update yet ? */
        if (last_jiffies_update.tv64 == 0)
                last_jiffies_update = tick_next_period;
        period = last_jiffies_update;
-       write_sequnlock(&jiffies_lock);
+       write_seqcount_end(&jiffies_seq);
+       raw_spin_unlock(&jiffies_lock);
        return period;
 }
 
@@ -176,6 +181,11 @@ static bool can_stop_full_tick(void)
                return false;
        }
 
+       if (!arch_irq_work_has_interrupt()) {
+               trace_tick_stop(0, "missing irq work interrupt\n");
+               return false;
+       }
+
        /* sched_clock_tick() needs us? */
 #ifdef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
        /*
@@ -204,6 +214,7 @@ static void nohz_full_kick_work_func(struct irq_work *work)
 
 static DEFINE_PER_CPU(struct irq_work, nohz_full_kick_work) = {
        .func = nohz_full_kick_work_func,
+       .flags = IRQ_WORK_HARD_IRQ,
 };
 
 /*
@@ -583,10 +594,10 @@ static ktime_t tick_nohz_stop_sched_tick(struct tick_sched *ts,
 
        /* Read jiffies and the time when jiffies were updated last */
        do {
-               seq = read_seqbegin(&jiffies_lock);
+               seq = read_seqcount_begin(&jiffies_seq);
                basemono = last_jiffies_update.tv64;
                basejiff = jiffies;
-       } while (read_seqretry(&jiffies_lock, seq));
+       } while (read_seqcount_retry(&jiffies_seq, seq));
        ts->last_jiffies = basejiff;
 
        /*
@@ -768,14 +779,7 @@ static bool can_stop_idle_tick(int cpu, struct tick_sched *ts)
                return false;
 
        if (unlikely(local_softirq_pending() && cpu_online(cpu))) {
-               static int ratelimit;
-
-               if (ratelimit < 10 &&
-                   (local_softirq_pending() & SOFTIRQ_STOP_IDLE_MASK)) {
-                       pr_warn("NOHZ: local_softirq_pending %02x\n",
-                               (unsigned int) local_softirq_pending());
-                       ratelimit++;
-               }
+               softirq_check_pending_idle();
                return false;
        }
 
@@ -1115,6 +1119,7 @@ void tick_setup_sched_timer(void)
         * Emulate tick processing via per-CPU hrtimers:
         */
        hrtimer_init(&ts->sched_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+       ts->sched_timer.irqsafe = 1;
        ts->sched_timer.function = tick_sched_timer;
 
        /* Get the next period (per cpu) */
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 6e4866834d26..6c3e5323d06b 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -2091,8 +2091,10 @@ EXPORT_SYMBOL(hardpps);
  */
 void xtime_update(unsigned long ticks)
 {
-       write_seqlock(&jiffies_lock);
+       raw_spin_lock(&jiffies_lock);
+       write_seqcount_begin(&jiffies_seq);
        do_timer(ticks);
-       write_sequnlock(&jiffies_lock);
+       write_seqcount_end(&jiffies_seq);
+       raw_spin_unlock(&jiffies_lock);
        update_wall_time();
 }
diff --git a/kernel/time/timekeeping.h b/kernel/time/timekeeping.h
index 704f595ce83f..763a3e5121ff 100644
--- a/kernel/time/timekeeping.h
+++ b/kernel/time/timekeeping.h
@@ -19,7 +19,8 @@ extern void timekeeping_resume(void);
 extern void do_timer(unsigned long ticks);
 extern void update_wall_time(void);
 
-extern seqlock_t jiffies_lock;
+extern raw_spinlock_t jiffies_lock;
+extern seqcount_t jiffies_seq;
 
 #define CS_NAME_LEN    32
 
diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 125407144c01..13652dafe83a 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -80,6 +80,9 @@ struct tvec_root {
 struct tvec_base {
        spinlock_t lock;
        struct timer_list *running_timer;
+#ifdef CONFIG_PREEMPT_RT_FULL
+       wait_queue_head_t wait_for_running_timer;
+#endif
        unsigned long timer_jiffies;
        unsigned long next_timer;
        unsigned long active_timers;
@@ -777,6 +780,39 @@ static struct tvec_base *lock_timer_base(struct timer_list *timer,
                cpu_relax();
        }
 }
+#ifdef CONFIG_PREEMPT_RT_FULL
+static inline struct tvec_base *switch_timer_base(struct timer_list *timer,
+                                                 struct tvec_base *old,
+                                                 struct tvec_base *new)
+{
+       /*
+        * We cannot do the below because we might be preempted and
+        * then the preempter would see NULL and loop forever.
+        */
+       if (spin_trylock(&new->lock)) {
+               WRITE_ONCE(timer->flags,
+                          (timer->flags & ~TIMER_BASEMASK) | new->cpu);
+               spin_unlock(&old->lock);
+               return new;
+       }
+       return old;
+}
+
+#else
+static inline struct tvec_base *switch_timer_base(struct timer_list *timer,
+                                                 struct tvec_base *old,
+                                                 struct tvec_base *new)
+{
+       /* See the comment in lock_timer_base() */
+       timer->flags |= TIMER_MIGRATING;
+
+       spin_unlock(&old->lock);
+       spin_lock(&new->lock);
+       WRITE_ONCE(timer->flags,
+                  (timer->flags & ~TIMER_BASEMASK) | new->cpu);
+       return new;
+}
+#endif
 
 static inline int
 __mod_timer(struct timer_list *timer, unsigned long expires,
@@ -807,16 +843,8 @@ __mod_timer(struct timer_list *timer, unsigned long expires,
                 * handler yet has not finished. This also guarantees that
                 * the timer is serialized wrt itself.
                 */
-               if (likely(base->running_timer != timer)) {
-                       /* See the comment in lock_timer_base() */
-                       timer->flags |= TIMER_MIGRATING;
-
-                       spin_unlock(&base->lock);
-                       base = new_base;
-                       spin_lock(&base->lock);
-                       WRITE_ONCE(timer->flags,
-                                  (timer->flags & ~TIMER_BASEMASK) | base->cpu);
-               }
+               if (likely(base->running_timer != timer))
+                       base = switch_timer_base(timer, base, new_base);
        }
 
        timer->expires = expires;
@@ -1006,6 +1034,33 @@ void add_timer_on(struct timer_list *timer, int cpu)
 }
 EXPORT_SYMBOL_GPL(add_timer_on);
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+/*
+ * Wait for a running timer
+ */
+static void wait_for_running_timer(struct timer_list *timer)
+{
+       struct tvec_base *base;
+       u32 tf = timer->flags;
+
+       if (tf & TIMER_MIGRATING)
+               return;
+
+       base = per_cpu_ptr(&tvec_bases, tf & TIMER_CPUMASK);
+       wait_event(base->wait_for_running_timer,
+                  base->running_timer != timer);
+}
+
+# define wakeup_timer_waiters(b)       wake_up_all(&(b)->wait_for_running_timer)
+#else
+static inline void wait_for_running_timer(struct timer_list *timer)
+{
+       cpu_relax();
+}
+
+# define wakeup_timer_waiters(b)       do { } while (0)
+#endif
+
 /**
  * del_timer - deactive a timer.
  * @timer: the timer to be deactivated
@@ -1063,7 +1118,7 @@ int try_to_del_timer_sync(struct timer_list *timer)
 }
 EXPORT_SYMBOL(try_to_del_timer_sync);
 
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT_RT_FULL)
 /**
  * del_timer_sync - deactivate a timer and wait for the handler to finish.
  * @timer: the timer to be deactivated
@@ -1123,7 +1178,7 @@ int del_timer_sync(struct timer_list *timer)
                int ret = try_to_del_timer_sync(timer);
                if (ret >= 0)
                        return ret;
-               cpu_relax();
+               wait_for_running_timer(timer);
        }
 }
 EXPORT_SYMBOL(del_timer_sync);
@@ -1248,16 +1303,18 @@ static inline void __run_timers(struct tvec_base *base)
                        if (irqsafe) {
                                spin_unlock(&base->lock);
                                call_timer_fn(timer, fn, data);
+                               base->running_timer = NULL;
                                spin_lock(&base->lock);
                        } else {
                                spin_unlock_irq(&base->lock);
                                call_timer_fn(timer, fn, data);
+                               base->running_timer = NULL;
                                spin_lock_irq(&base->lock);
                        }
                }
        }
-       base->running_timer = NULL;
        spin_unlock_irq(&base->lock);
+       wakeup_timer_waiters(base);
 }
 
 #ifdef CONFIG_NO_HZ_COMMON
@@ -1390,6 +1447,14 @@ u64 get_next_timer_interrupt(unsigned long basej, u64 basem)
        if (cpu_is_offline(smp_processor_id()))
                return expires;
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+       /*
+        * On PREEMPT_RT we cannot sleep here. As a result we can't take
+        * the base lock to check when the next timer is pending and so
+        * we assume the next jiffy.
+        */
+       return basem + TICK_NSEC;
+#endif
        spin_lock(&base->lock);
        if (base->active_timers) {
                if (time_before_eq(base->next_timer, base->timer_jiffies))
@@ -1416,13 +1481,13 @@ void update_process_times(int user_tick)
 
        /* Note: this timer irq context must be accounted for as well. */
        account_process_tick(p, user_tick);
+       scheduler_tick();
        run_local_timers();
        rcu_check_callbacks(user_tick);
-#ifdef CONFIG_IRQ_WORK
+#if defined(CONFIG_IRQ_WORK)
        if (in_irq())
                irq_work_tick();
 #endif
-       scheduler_tick();
        run_posix_cpu_timers(p);
 }
 
@@ -1433,6 +1498,8 @@ static void run_timer_softirq(struct softirq_action *h)
 {
        struct tvec_base *base = this_cpu_ptr(&tvec_bases);
 
+       irq_work_tick_soft();
+
        if (time_after_eq(jiffies, base->timer_jiffies))
                __run_timers(base);
 }
@@ -1589,7 +1656,7 @@ static void migrate_timers(int cpu)
 
        BUG_ON(cpu_online(cpu));
        old_base = per_cpu_ptr(&tvec_bases, cpu);
-       new_base = get_cpu_ptr(&tvec_bases);
+       new_base = get_local_ptr(&tvec_bases);
        /*
         * The caller is globally serialized and nobody else
         * takes two locks at once, deadlock is not possible.
@@ -1613,7 +1680,7 @@ static void migrate_timers(int cpu)
 
        spin_unlock(&old_base->lock);
        spin_unlock_irq(&new_base->lock);
-       put_cpu_ptr(&tvec_bases);
+       put_local_ptr(&tvec_bases);
 }
 
 static int timer_cpu_notify(struct notifier_block *self,
@@ -1645,6 +1712,9 @@ static void __init init_timer_cpu(int cpu)
 
        base->cpu = cpu;
        spin_lock_init(&base->lock);
+#ifdef CONFIG_PREEMPT_RT_FULL
+       init_waitqueue_head(&base->wait_for_running_timer);
+#endif
 
        base->timer_jiffies = jiffies;
        base->next_timer = base->timer_jiffies;
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index e45db6b0d878..364ccd0eb57b 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -187,6 +187,24 @@ config IRQSOFF_TRACER
          enabled. This option and the preempt-off timing option can be
          used together or separately.)
 
+config INTERRUPT_OFF_HIST
+       bool "Interrupts-off Latency Histogram"
+       depends on IRQSOFF_TRACER
+       help
+         This option generates continuously updated histograms (one per cpu)
+         of the duration of time periods with interrupts disabled. The
+         histograms are disabled by default. To enable them, write a non-zero
+         number to
+
+             /sys/kernel/debug/tracing/latency_hist/enable/preemptirqsoff
+
+         If PREEMPT_OFF_HIST is also selected, additional histograms (one
+         per cpu) are generated that accumulate the duration of time periods
+         when both interrupts and preemption are disabled. The histogram data
+         will be located in the debug file system at
+
+             /sys/kernel/debug/tracing/latency_hist/irqsoff
+
 config PREEMPT_TRACER
        bool "Preemption-off Latency Tracer"
        default n
@@ -211,6 +229,24 @@ config PREEMPT_TRACER
          enabled. This option and the irqs-off timing option can be
          used together or separately.)
 
+config PREEMPT_OFF_HIST
+       bool "Preemption-off Latency Histogram"
+       depends on PREEMPT_TRACER
+       help
+         This option generates continuously updated histograms (one per cpu)
+         of the duration of time periods with preemption disabled. The
+         histograms are disabled by default. To enable them, write a non-zero
+         number to
+
+             /sys/kernel/debug/tracing/latency_hist/enable/preemptirqsoff
+
+         If INTERRUPT_OFF_HIST is also selected, additional histograms (one
+         per cpu) are generated that accumulate the duration of time periods
+         when both interrupts and preemption are disabled. The histogram data
+         will be located in the debug file system at
+
+             /sys/kernel/debug/tracing/latency_hist/preemptoff
+
 config SCHED_TRACER
        bool "Scheduling Latency Tracer"
        select GENERIC_TRACER
@@ -221,6 +257,74 @@ config SCHED_TRACER
          This tracer tracks the latency of the highest priority task
          to be scheduled in, starting from the point it has woken up.
 
+config WAKEUP_LATENCY_HIST
+       bool "Scheduling Latency Histogram"
+       depends on SCHED_TRACER
+       help
+         This option generates continuously updated histograms (one per cpu)
+         of the scheduling latency of the highest priority task.
+         The histograms are disabled by default. To enable them, write a
+         non-zero number to
+
+             /sys/kernel/debug/tracing/latency_hist/enable/wakeup
+
+         Two different algorithms are used, one to determine the latency of
+         processes that exclusively use the highest priority of the system and
+         another one to determine the latency of processes that share the
+         highest system priority with other processes. The former is used to
+         improve hardware and system software, the latter to optimize the
+         priority design of a given system. The histogram data will be
+         located in the debug file system at
+
+             /sys/kernel/debug/tracing/latency_hist/wakeup
+
+         and
+
+             /sys/kernel/debug/tracing/latency_hist/wakeup/sharedprio
+
+         If both Scheduling Latency Histogram and Missed Timer Offsets
+         Histogram are selected, additional histogram data will be collected
+         that contain, in addition to the wakeup latency, the timer latency, in
+         case the wakeup was triggered by an expired timer. These histograms
+         are available in the
+
+             /sys/kernel/debug/tracing/latency_hist/timerandwakeup
+
+         directory. They reflect the apparent interrupt and scheduling latency
+         and are best suitable to determine the worst-case latency of a given
+         system. To enable these histograms, write a non-zero number to
+
+             /sys/kernel/debug/tracing/latency_hist/enable/timerandwakeup
+
+config MISSED_TIMER_OFFSETS_HIST
+       depends on HIGH_RES_TIMERS
+       select GENERIC_TRACER
+       bool "Missed Timer Offsets Histogram"
+       help
+         Generate a histogram of missed timer offsets in microseconds. The
+         histograms are disabled by default. To enable them, write a non-zero
+         number to
+
+             /sys/kernel/debug/tracing/latency_hist/enable/missed_timer_offsets
+
+         The histogram data will be located in the debug file system at
+
+             /sys/kernel/debug/tracing/latency_hist/missed_timer_offsets
+
+         If both Scheduling Latency Histogram and Missed Timer Offsets
+         Histogram are selected, additional histogram data will be collected
+         that contain, in addition to the wakeup latency, the timer latency, in
+         case the wakeup was triggered by an expired timer. These histograms
+         are available in the
+
+             /sys/kernel/debug/tracing/latency_hist/timerandwakeup
+
+         directory. They reflect the apparent interrupt and scheduling latency
+         and are best suitable to determine the worst-case latency of a given
+         system. To enable these histograms, write a non-zero number to
+
+             /sys/kernel/debug/tracing/latency_hist/enable/timerandwakeup
+
 config ENABLE_DEFAULT_TRACERS
        bool "Trace process context switches and events"
        depends on !GENERIC_TRACER
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 05ea5167e6bb..bc08c67301ae 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -40,6 +40,10 @@ obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
 obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
 obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
 obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
+obj-$(CONFIG_INTERRUPT_OFF_HIST) += latency_hist.o
+obj-$(CONFIG_PREEMPT_OFF_HIST) += latency_hist.o
+obj-$(CONFIG_WAKEUP_LATENCY_HIST) += latency_hist.o
+obj-$(CONFIG_MISSED_TIMER_OFFSETS_HIST) += latency_hist.o
 obj-$(CONFIG_NOP_TRACER) += trace_nop.o
 obj-$(CONFIG_STACK_TRACER) += trace_stack.o
 obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
diff --git a/kernel/trace/latency_hist.c b/kernel/trace/latency_hist.c
new file mode 100644
index 000000000000..7f6ee70dea41
--- /dev/null
+++ b/kernel/trace/latency_hist.c
@@ -0,0 +1,1178 @@
+/*
+ * kernel/trace/latency_hist.c
+ *
+ * Add support for histograms of preemption-off latency and
+ * interrupt-off latency and wakeup latency, it depends on
+ * Real-Time Preemption Support.
+ *
+ *  Copyright (C) 2005 MontaVista Software, Inc.
+ *  Yi Yang <yyang@ch.mvista.com>
+ *
+ *  Converted to work with the new latency tracer.
+ *  Copyright (C) 2008 Red Hat, Inc.
+ *    Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+#include <linux/module.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/percpu.h>
+#include <linux/kallsyms.h>
+#include <linux/uaccess.h>
+#include <linux/sched.h>
+#include <linux/sched/rt.h>
+#include <linux/slab.h>
+#include <linux/atomic.h>
+#include <asm/div64.h>
+
+#include "trace.h"
+#include <trace/events/sched.h>
+
+#define NSECS_PER_USECS 1000L
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/hist.h>
+
+enum {
+       IRQSOFF_LATENCY = 0,
+       PREEMPTOFF_LATENCY,
+       PREEMPTIRQSOFF_LATENCY,
+       WAKEUP_LATENCY,
+       WAKEUP_LATENCY_SHAREDPRIO,
+       MISSED_TIMER_OFFSETS,
+       TIMERANDWAKEUP_LATENCY,
+       MAX_LATENCY_TYPE,
+};
+
+#define MAX_ENTRY_NUM 10240
+
+struct hist_data {
+       atomic_t hist_mode; /* 0 log, 1 don't log */
+       long offset; /* set it to MAX_ENTRY_NUM/2 for a bipolar scale */
+       long min_lat;
+       long max_lat;
+       unsigned long long below_hist_bound_samples;
+       unsigned long long above_hist_bound_samples;
+       long long accumulate_lat;
+       unsigned long long total_samples;
+       unsigned long long hist_array[MAX_ENTRY_NUM];
+};
+
+struct enable_data {
+       int latency_type;
+       int enabled;
+};
+
+static char *latency_hist_dir_root = "latency_hist";
+
+#ifdef CONFIG_INTERRUPT_OFF_HIST
+static DEFINE_PER_CPU(struct hist_data, irqsoff_hist);
+static char *irqsoff_hist_dir = "irqsoff";
+static DEFINE_PER_CPU(cycles_t, hist_irqsoff_start);
+static DEFINE_PER_CPU(int, hist_irqsoff_counting);
+#endif
+
+#ifdef CONFIG_PREEMPT_OFF_HIST
+static DEFINE_PER_CPU(struct hist_data, preemptoff_hist);
+static char *preemptoff_hist_dir = "preemptoff";
+static DEFINE_PER_CPU(cycles_t, hist_preemptoff_start);
+static DEFINE_PER_CPU(int, hist_preemptoff_counting);
+#endif
+
+#if defined(CONFIG_PREEMPT_OFF_HIST) && defined(CONFIG_INTERRUPT_OFF_HIST)
+static DEFINE_PER_CPU(struct hist_data, preemptirqsoff_hist);
+static char *preemptirqsoff_hist_dir = "preemptirqsoff";
+static DEFINE_PER_CPU(cycles_t, hist_preemptirqsoff_start);
+static DEFINE_PER_CPU(int, hist_preemptirqsoff_counting);
+#endif
+
+#if defined(CONFIG_PREEMPT_OFF_HIST) || defined(CONFIG_INTERRUPT_OFF_HIST)
+static notrace void probe_preemptirqsoff_hist(void *v, int reason, int start);
+static struct enable_data preemptirqsoff_enabled_data = {
+       .latency_type = PREEMPTIRQSOFF_LATENCY,
+       .enabled = 0,
+};
+#endif
+
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+struct maxlatproc_data {
+       char comm[FIELD_SIZEOF(struct task_struct, comm)];
+       char current_comm[FIELD_SIZEOF(struct task_struct, comm)];
+       int pid;
+       int current_pid;
+       int prio;
+       int current_prio;
+       long latency;
+       long timeroffset;
+       cycle_t timestamp;
+};
+#endif
+
+#ifdef CONFIG_WAKEUP_LATENCY_HIST
+static DEFINE_PER_CPU(struct hist_data, wakeup_latency_hist);
+static DEFINE_PER_CPU(struct hist_data, wakeup_latency_hist_sharedprio);
+static char *wakeup_latency_hist_dir = "wakeup";
+static char *wakeup_latency_hist_dir_sharedprio = "sharedprio";
+static notrace void probe_wakeup_latency_hist_start(void *v,
+       struct task_struct *p);
+static notrace void probe_wakeup_latency_hist_stop(void *v,
+       bool preempt, struct task_struct *prev, struct task_struct *next);
+static notrace void probe_sched_migrate_task(void *,
+       struct task_struct *task, int cpu);
+static struct enable_data wakeup_latency_enabled_data = {
+       .latency_type = WAKEUP_LATENCY,
+       .enabled = 0,
+};
+static DEFINE_PER_CPU(struct maxlatproc_data, wakeup_maxlatproc);
+static DEFINE_PER_CPU(struct maxlatproc_data, wakeup_maxlatproc_sharedprio);
+static DEFINE_PER_CPU(struct task_struct *, wakeup_task);
+static DEFINE_PER_CPU(int, wakeup_sharedprio);
+static unsigned long wakeup_pid;
+#endif
+
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+static DEFINE_PER_CPU(struct hist_data, missed_timer_offsets);
+static char *missed_timer_offsets_dir = "missed_timer_offsets";
+static notrace void probe_hrtimer_interrupt(void *v, int cpu,
+       long long offset, struct task_struct *curr, struct task_struct *task);
+static struct enable_data missed_timer_offsets_enabled_data = {
+       .latency_type = MISSED_TIMER_OFFSETS,
+       .enabled = 0,
+};
+static DEFINE_PER_CPU(struct maxlatproc_data, missed_timer_offsets_maxlatproc);
+static unsigned long missed_timer_offsets_pid;
+#endif
+
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+static DEFINE_PER_CPU(struct hist_data, timerandwakeup_latency_hist);
+static char *timerandwakeup_latency_hist_dir = "timerandwakeup";
+static struct enable_data timerandwakeup_enabled_data = {
+       .latency_type = TIMERANDWAKEUP_LATENCY,
+       .enabled = 0,
+};
+static DEFINE_PER_CPU(struct maxlatproc_data, timerandwakeup_maxlatproc);
+#endif
+
+void notrace latency_hist(int latency_type, int cpu, long latency,
+                         long timeroffset, cycle_t stop,
+                         struct task_struct *p)
+{
+       struct hist_data *my_hist;
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+       struct maxlatproc_data *mp = NULL;
+#endif
+
+       if (!cpu_possible(cpu) || latency_type < 0 ||
+           latency_type >= MAX_LATENCY_TYPE)
+               return;
+
+       switch (latency_type) {
+#ifdef CONFIG_INTERRUPT_OFF_HIST
+       case IRQSOFF_LATENCY:
+               my_hist = &per_cpu(irqsoff_hist, cpu);
+               break;
+#endif
+#ifdef CONFIG_PREEMPT_OFF_HIST
+       case PREEMPTOFF_LATENCY:
+               my_hist = &per_cpu(preemptoff_hist, cpu);
+               break;
+#endif
+#if defined(CONFIG_PREEMPT_OFF_HIST) && defined(CONFIG_INTERRUPT_OFF_HIST)
+       case PREEMPTIRQSOFF_LATENCY:
+               my_hist = &per_cpu(preemptirqsoff_hist, cpu);
+               break;
+#endif
+#ifdef CONFIG_WAKEUP_LATENCY_HIST
+       case WAKEUP_LATENCY:
+               my_hist = &per_cpu(wakeup_latency_hist, cpu);
+               mp = &per_cpu(wakeup_maxlatproc, cpu);
+               break;
+       case WAKEUP_LATENCY_SHAREDPRIO:
+               my_hist = &per_cpu(wakeup_latency_hist_sharedprio, cpu);
+               mp = &per_cpu(wakeup_maxlatproc_sharedprio, cpu);
+               break;
+#endif
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+       case MISSED_TIMER_OFFSETS:
+               my_hist = &per_cpu(missed_timer_offsets, cpu);
+               mp = &per_cpu(missed_timer_offsets_maxlatproc, cpu);
+               break;
+#endif
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+       case TIMERANDWAKEUP_LATENCY:
+               my_hist = &per_cpu(timerandwakeup_latency_hist, cpu);
+               mp = &per_cpu(timerandwakeup_maxlatproc, cpu);
+               break;
+#endif
+
+       default:
+               return;
+       }
+
+       latency += my_hist->offset;
+
+       if (atomic_read(&my_hist->hist_mode) == 0)
+               return;
+
+       if (latency < 0 || latency >= MAX_ENTRY_NUM) {
+               if (latency < 0)
+                       my_hist->below_hist_bound_samples++;
+               else
+                       my_hist->above_hist_bound_samples++;
+       } else
+               my_hist->hist_array[latency]++;
+
+       if (unlikely(latency > my_hist->max_lat ||
+           my_hist->min_lat == LONG_MAX)) {
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+               if (latency_type == WAKEUP_LATENCY ||
+                   latency_type == WAKEUP_LATENCY_SHAREDPRIO ||
+                   latency_type == MISSED_TIMER_OFFSETS ||
+                   latency_type == TIMERANDWAKEUP_LATENCY) {
+                       strncpy(mp->comm, p->comm, sizeof(mp->comm));
+                       strncpy(mp->current_comm, current->comm,
+                           sizeof(mp->current_comm));
+                       mp->pid = task_pid_nr(p);
+                       mp->current_pid = task_pid_nr(current);
+                       mp->prio = p->prio;
+                       mp->current_prio = current->prio;
+                       mp->latency = latency;
+                       mp->timeroffset = timeroffset;
+                       mp->timestamp = stop;
+               }
+#endif
+               my_hist->max_lat = latency;
+       }
+       if (unlikely(latency < my_hist->min_lat))
+               my_hist->min_lat = latency;
+       my_hist->total_samples++;
+       my_hist->accumulate_lat += latency;
+}
+
+static void *l_start(struct seq_file *m, loff_t *pos)
+{
+       loff_t *index_ptr = NULL;
+       loff_t index = *pos;
+       struct hist_data *my_hist = m->private;
+
+       if (index == 0) {
+               char minstr[32], avgstr[32], maxstr[32];
+
+               atomic_dec(&my_hist->hist_mode);
+
+               if (likely(my_hist->total_samples)) {
+                       long avg = (long) div64_s64(my_hist->accumulate_lat,
+                           my_hist->total_samples);
+                       snprintf(minstr, sizeof(minstr), "%ld",
+                           my_hist->min_lat - my_hist->offset);
+                       snprintf(avgstr, sizeof(avgstr), "%ld",
+                           avg - my_hist->offset);
+                       snprintf(maxstr, sizeof(maxstr), "%ld",
+                           my_hist->max_lat - my_hist->offset);
+               } else {
+                       strcpy(minstr, "<undef>");
+                       strcpy(avgstr, minstr);
+                       strcpy(maxstr, minstr);
+               }
+
+               seq_printf(m, "#Minimum latency: %s microseconds\n"
+                          "#Average latency: %s microseconds\n"
+                          "#Maximum latency: %s microseconds\n"
+                          "#Total samples: %llu\n"
+                          "#There are %llu samples lower than %ld"
+                          " microseconds.\n"
+                          "#There are %llu samples greater or equal"
+                          " than %ld microseconds.\n"
+                          "#usecs\t%16s\n",
+                          minstr, avgstr, maxstr,
+                          my_hist->total_samples,
+                          my_hist->below_hist_bound_samples,
+                          -my_hist->offset,
+                          my_hist->above_hist_bound_samples,
+                          MAX_ENTRY_NUM - my_hist->offset,
+                          "samples");
+       }
+       if (index < MAX_ENTRY_NUM) {
+               index_ptr = kmalloc(sizeof(loff_t), GFP_KERNEL);
+               if (index_ptr)
+                       *index_ptr = index;
+       }
+
+       return index_ptr;
+}
+
+static void *l_next(struct seq_file *m, void *p, loff_t *pos)
+{
+       loff_t *index_ptr = p;
+       struct hist_data *my_hist = m->private;
+
+       if (++*pos >= MAX_ENTRY_NUM) {
+               atomic_inc(&my_hist->hist_mode);
+               return NULL;
+       }
+       *index_ptr = *pos;
+       return index_ptr;
+}
+
+static void l_stop(struct seq_file *m, void *p)
+{
+       kfree(p);
+}
+
+static int l_show(struct seq_file *m, void *p)
+{
+       int index = *(loff_t *) p;
+       struct hist_data *my_hist = m->private;
+
+       seq_printf(m, "%6ld\t%16llu\n", index - my_hist->offset,
+           my_hist->hist_array[index]);
+       return 0;
+}
+
+static const struct seq_operations latency_hist_seq_op = {
+       .start = l_start,
+       .next  = l_next,
+       .stop  = l_stop,
+       .show  = l_show
+};
+
+static int latency_hist_open(struct inode *inode, struct file *file)
+{
+       int ret;
+
+       ret = seq_open(file, &latency_hist_seq_op);
+       if (!ret) {
+               struct seq_file *seq = file->private_data;
+               seq->private = inode->i_private;
+       }
+       return ret;
+}
+
+static const struct file_operations latency_hist_fops = {
+       .open = latency_hist_open,
+       .read = seq_read,
+       .llseek = seq_lseek,
+       .release = seq_release,
+};
+
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+static void clear_maxlatprocdata(struct maxlatproc_data *mp)
+{
+       mp->comm[0] = mp->current_comm[0] = '\0';
+       mp->prio = mp->current_prio = mp->pid = mp->current_pid =
+           mp->latency = mp->timeroffset = -1;
+       mp->timestamp = 0;
+}
+#endif
+
+static void hist_reset(struct hist_data *hist)
+{
+       atomic_dec(&hist->hist_mode);
+
+       memset(hist->hist_array, 0, sizeof(hist->hist_array));
+       hist->below_hist_bound_samples = 0ULL;
+       hist->above_hist_bound_samples = 0ULL;
+       hist->min_lat = LONG_MAX;
+       hist->max_lat = LONG_MIN;
+       hist->total_samples = 0ULL;
+       hist->accumulate_lat = 0LL;
+
+       atomic_inc(&hist->hist_mode);
+}
+
+static ssize_t
+latency_hist_reset(struct file *file, const char __user *a,
+                  size_t size, loff_t *off)
+{
+       int cpu;
+       struct hist_data *hist = NULL;
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+       struct maxlatproc_data *mp = NULL;
+#endif
+       off_t latency_type = (off_t) file->private_data;
+
+       for_each_online_cpu(cpu) {
+
+               switch (latency_type) {
+#ifdef CONFIG_PREEMPT_OFF_HIST
+               case PREEMPTOFF_LATENCY:
+                       hist = &per_cpu(preemptoff_hist, cpu);
+                       break;
+#endif
+#ifdef CONFIG_INTERRUPT_OFF_HIST
+               case IRQSOFF_LATENCY:
+                       hist = &per_cpu(irqsoff_hist, cpu);
+                       break;
+#endif
+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
+               case PREEMPTIRQSOFF_LATENCY:
+                       hist = &per_cpu(preemptirqsoff_hist, cpu);
+                       break;
+#endif
+#ifdef CONFIG_WAKEUP_LATENCY_HIST
+               case WAKEUP_LATENCY:
+                       hist = &per_cpu(wakeup_latency_hist, cpu);
+                       mp = &per_cpu(wakeup_maxlatproc, cpu);
+                       break;
+               case WAKEUP_LATENCY_SHAREDPRIO:
+                       hist = &per_cpu(wakeup_latency_hist_sharedprio, cpu);
+                       mp = &per_cpu(wakeup_maxlatproc_sharedprio, cpu);
+                       break;
+#endif
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+               case MISSED_TIMER_OFFSETS:
+                       hist = &per_cpu(missed_timer_offsets, cpu);
+                       mp = &per_cpu(missed_timer_offsets_maxlatproc, cpu);
+                       break;
+#endif
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+               case TIMERANDWAKEUP_LATENCY:
+                       hist = &per_cpu(timerandwakeup_latency_hist, cpu);
+                       mp = &per_cpu(timerandwakeup_maxlatproc, cpu);
+                       break;
+#endif
+               }
+
+               hist_reset(hist);
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+               if (latency_type == WAKEUP_LATENCY ||
+                   latency_type == WAKEUP_LATENCY_SHAREDPRIO ||
+                   latency_type == MISSED_TIMER_OFFSETS ||
+                   latency_type == TIMERANDWAKEUP_LATENCY)
+                       clear_maxlatprocdata(mp);
+#endif
+       }
+
+       return size;
+}
+
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+static ssize_t
+show_pid(struct file *file, char __user *ubuf, size_t cnt, loff_t *ppos)
+{
+       char buf[64];
+       int r;
+       unsigned long *this_pid = file->private_data;
+
+       r = snprintf(buf, sizeof(buf), "%lu\n", *this_pid);
+       return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+}
+
+static ssize_t do_pid(struct file *file, const char __user *ubuf,
+                     size_t cnt, loff_t *ppos)
+{
+       char buf[64];
+       unsigned long pid;
+       unsigned long *this_pid = file->private_data;
+
+       if (cnt >= sizeof(buf))
+               return -EINVAL;
+
+       if (copy_from_user(&buf, ubuf, cnt))
+               return -EFAULT;
+
+       buf[cnt] = '\0';
+
+       if (kstrtoul(buf, 10, &pid))
+               return -EINVAL;
+
+       *this_pid = pid;
+
+       return cnt;
+}
+#endif
+
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+static ssize_t
+show_maxlatproc(struct file *file, char __user *ubuf, size_t cnt, loff_t *ppos)
+{
+       int r;
+       struct maxlatproc_data *mp = file->private_data;
+       int strmaxlen = (TASK_COMM_LEN * 2) + (8 * 8);
+       unsigned long long t;
+       unsigned long usecs, secs;
+       char *buf;
+
+       if (mp->pid == -1 || mp->current_pid == -1) {
+               buf = "(none)\n";
+               return simple_read_from_buffer(ubuf, cnt, ppos, buf,
+                   strlen(buf));
+       }
+
+       buf = kmalloc(strmaxlen, GFP_KERNEL);
+       if (buf == NULL)
+               return -ENOMEM;
+
+       t = ns2usecs(mp->timestamp);
+       usecs = do_div(t, USEC_PER_SEC);
+       secs = (unsigned long) t;
+       r = snprintf(buf, strmaxlen,
+           "%d %d %ld (%ld) %s <- %d %d %s %lu.%06lu\n", mp->pid,
+           MAX_RT_PRIO-1 - mp->prio, mp->latency, mp->timeroffset, mp->comm,
+           mp->current_pid, MAX_RT_PRIO-1 - mp->current_prio, mp->current_comm,
+           secs, usecs);
+       r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+       kfree(buf);
+       return r;
+}
+#endif
+
+static ssize_t
+show_enable(struct file *file, char __user *ubuf, size_t cnt, loff_t *ppos)
+{
+       char buf[64];
+       struct enable_data *ed = file->private_data;
+       int r;
+
+       r = snprintf(buf, sizeof(buf), "%d\n", ed->enabled);
+       return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+}
+
+static ssize_t
+do_enable(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos)
+{
+       char buf[64];
+       long enable;
+       struct enable_data *ed = file->private_data;
+
+       if (cnt >= sizeof(buf))
+               return -EINVAL;
+
+       if (copy_from_user(&buf, ubuf, cnt))
+               return -EFAULT;
+
+       buf[cnt] = 0;
+
+       if (kstrtoul(buf, 10, &enable))
+               return -EINVAL;
+
+       if ((enable && ed->enabled) || (!enable && !ed->enabled))
+               return cnt;
+
+       if (enable) {
+               int ret;
+
+               switch (ed->latency_type) {
+#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST)
+               case PREEMPTIRQSOFF_LATENCY:
+                       ret = register_trace_preemptirqsoff_hist(
+                           probe_preemptirqsoff_hist, NULL);
+                       if (ret) {
+                               pr_info("wakeup trace: Couldn't assign "
+                                   "probe_preemptirqsoff_hist "
+                                   "to trace_preemptirqsoff_hist\n");
+                               return ret;
+                       }
+                       break;
+#endif
+#ifdef CONFIG_WAKEUP_LATENCY_HIST
+               case WAKEUP_LATENCY:
+                       ret = register_trace_sched_wakeup(
+                           probe_wakeup_latency_hist_start, NULL);
+                       if (ret) {
+                               pr_info("wakeup trace: Couldn't assign "
+                                   "probe_wakeup_latency_hist_start "
+                                   "to trace_sched_wakeup\n");
+                               return ret;
+                       }
+                       ret = register_trace_sched_wakeup_new(
+                           probe_wakeup_latency_hist_start, NULL);
+                       if (ret) {
+                               pr_info("wakeup trace: Couldn't assign "
+                                   "probe_wakeup_latency_hist_start "
+                                   "to trace_sched_wakeup_new\n");
+                               unregister_trace_sched_wakeup(
+                                   probe_wakeup_latency_hist_start, NULL);
+                               return ret;
+                       }
+                       ret = register_trace_sched_switch(
+                           probe_wakeup_latency_hist_stop, NULL);
+                       if (ret) {
+                               pr_info("wakeup trace: Couldn't assign "
+                                   "probe_wakeup_latency_hist_stop "
+                                   "to trace_sched_switch\n");
+                               unregister_trace_sched_wakeup(
+                                   probe_wakeup_latency_hist_start, NULL);
+                               unregister_trace_sched_wakeup_new(
+                                   probe_wakeup_latency_hist_start, NULL);
+                               return ret;
+                       }
+                       ret = register_trace_sched_migrate_task(
+                           probe_sched_migrate_task, NULL);
+                       if (ret) {
+                               pr_info("wakeup trace: Couldn't assign "
+                                   "probe_sched_migrate_task "
+                                   "to trace_sched_migrate_task\n");
+                               unregister_trace_sched_wakeup(
+                                   probe_wakeup_latency_hist_start, NULL);
+                               unregister_trace_sched_wakeup_new(
+                                   probe_wakeup_latency_hist_start, NULL);
+                               unregister_trace_sched_switch(
+                                   probe_wakeup_latency_hist_stop, NULL);
+                               return ret;
+                       }
+                       break;
+#endif
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+               case MISSED_TIMER_OFFSETS:
+                       ret = register_trace_hrtimer_interrupt(
+                           probe_hrtimer_interrupt, NULL);
+                       if (ret) {
+                               pr_info("wakeup trace: Couldn't assign "
+                                   "probe_hrtimer_interrupt "
+                                   "to trace_hrtimer_interrupt\n");
+                               return ret;
+                       }
+                       break;
+#endif
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+               case TIMERANDWAKEUP_LATENCY:
+                       if (!wakeup_latency_enabled_data.enabled ||
+                           !missed_timer_offsets_enabled_data.enabled)
+                               return -EINVAL;
+                       break;
+#endif
+               default:
+                       break;
+               }
+       } else {
+               switch (ed->latency_type) {
+#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST)
+               case PREEMPTIRQSOFF_LATENCY:
+                       {
+                               int cpu;
+
+                               unregister_trace_preemptirqsoff_hist(
+                                   probe_preemptirqsoff_hist, NULL);
+                               for_each_online_cpu(cpu) {
+#ifdef CONFIG_INTERRUPT_OFF_HIST
+                                       per_cpu(hist_irqsoff_counting,
+                                           cpu) = 0;
+#endif
+#ifdef CONFIG_PREEMPT_OFF_HIST
+                                       per_cpu(hist_preemptoff_counting,
+                                           cpu) = 0;
+#endif
+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
+                                       per_cpu(hist_preemptirqsoff_counting,
+                                           cpu) = 0;
+#endif
+                               }
+                       }
+                       break;
+#endif
+#ifdef CONFIG_WAKEUP_LATENCY_HIST
+               case WAKEUP_LATENCY:
+                       {
+                               int cpu;
+
+                               unregister_trace_sched_wakeup(
+                                   probe_wakeup_latency_hist_start, NULL);
+                               unregister_trace_sched_wakeup_new(
+                                   probe_wakeup_latency_hist_start, NULL);
+                               unregister_trace_sched_switch(
+                                   probe_wakeup_latency_hist_stop, NULL);
+                               unregister_trace_sched_migrate_task(
+                                   probe_sched_migrate_task, NULL);
+
+                               for_each_online_cpu(cpu) {
+                                       per_cpu(wakeup_task, cpu) = NULL;
+                                       per_cpu(wakeup_sharedprio, cpu) = 0;
+                               }
+                       }
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+                       timerandwakeup_enabled_data.enabled = 0;
+#endif
+                       break;
+#endif
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+               case MISSED_TIMER_OFFSETS:
+                       unregister_trace_hrtimer_interrupt(
+                           probe_hrtimer_interrupt, NULL);
+#ifdef CONFIG_WAKEUP_LATENCY_HIST
+                       timerandwakeup_enabled_data.enabled = 0;
+#endif
+                       break;
+#endif
+               default:
+                       break;
+               }
+       }
+       ed->enabled = enable;
+       return cnt;
+}
+
+static const struct file_operations latency_hist_reset_fops = {
+       .open = tracing_open_generic,
+       .write = latency_hist_reset,
+};
+
+static const struct file_operations enable_fops = {
+       .open = tracing_open_generic,
+       .read = show_enable,
+       .write = do_enable,
+};
+
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+static const struct file_operations pid_fops = {
+       .open = tracing_open_generic,
+       .read = show_pid,
+       .write = do_pid,
+};
+
+static const struct file_operations maxlatproc_fops = {
+       .open = tracing_open_generic,
+       .read = show_maxlatproc,
+};
+#endif
+
+#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST)
+static notrace void probe_preemptirqsoff_hist(void *v, int reason,
+       int starthist)
+{
+       int cpu = raw_smp_processor_id();
+       int time_set = 0;
+
+       if (starthist) {
+               cycle_t uninitialized_var(start);
+
+               if (!preempt_count() && !irqs_disabled())
+                       return;
+
+#ifdef CONFIG_INTERRUPT_OFF_HIST
+               if ((reason == IRQS_OFF || reason == TRACE_START) &&
+                   !per_cpu(hist_irqsoff_counting, cpu)) {
+                       per_cpu(hist_irqsoff_counting, cpu) = 1;
+                       start = ftrace_now(cpu);
+                       time_set++;
+                       per_cpu(hist_irqsoff_start, cpu) = start;
+               }
+#endif
+
+#ifdef CONFIG_PREEMPT_OFF_HIST
+               if ((reason == PREEMPT_OFF || reason == TRACE_START) &&
+                   !per_cpu(hist_preemptoff_counting, cpu)) {
+                       per_cpu(hist_preemptoff_counting, cpu) = 1;
+                       if (!(time_set++))
+                               start = ftrace_now(cpu);
+                       per_cpu(hist_preemptoff_start, cpu) = start;
+               }
+#endif
+
+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
+               if (per_cpu(hist_irqsoff_counting, cpu) &&
+                   per_cpu(hist_preemptoff_counting, cpu) &&
+                   !per_cpu(hist_preemptirqsoff_counting, cpu)) {
+                       per_cpu(hist_preemptirqsoff_counting, cpu) = 1;
+                       if (!time_set)
+                               start = ftrace_now(cpu);
+                       per_cpu(hist_preemptirqsoff_start, cpu) = start;
+               }
+#endif
+       } else {
+               cycle_t uninitialized_var(stop);
+
+#ifdef CONFIG_INTERRUPT_OFF_HIST
+               if ((reason == IRQS_ON || reason == TRACE_STOP) &&
+                   per_cpu(hist_irqsoff_counting, cpu)) {
+                       cycle_t start = per_cpu(hist_irqsoff_start, cpu);
+
+                       stop = ftrace_now(cpu);
+                       time_set++;
+                       if (start) {
+                               long latency = ((long) (stop - start)) /
+                                   NSECS_PER_USECS;
+
+                               latency_hist(IRQSOFF_LATENCY, cpu, latency, 0,
+                                   stop, NULL);
+                       }
+                       per_cpu(hist_irqsoff_counting, cpu) = 0;
+               }
+#endif
+
+#ifdef CONFIG_PREEMPT_OFF_HIST
+               if ((reason == PREEMPT_ON || reason == TRACE_STOP) &&
+                   per_cpu(hist_preemptoff_counting, cpu)) {
+                       cycle_t start = per_cpu(hist_preemptoff_start, cpu);
+
+                       if (!(time_set++))
+                               stop = ftrace_now(cpu);
+                       if (start) {
+                               long latency = ((long) (stop - start)) /
+                                   NSECS_PER_USECS;
+
+                               latency_hist(PREEMPTOFF_LATENCY, cpu, latency,
+                                   0, stop, NULL);
+                       }
+                       per_cpu(hist_preemptoff_counting, cpu) = 0;
+               }
+#endif
+
+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
+               if ((!per_cpu(hist_irqsoff_counting, cpu) ||
+                    !per_cpu(hist_preemptoff_counting, cpu)) &&
+                  per_cpu(hist_preemptirqsoff_counting, cpu)) {
+                       cycle_t start = per_cpu(hist_preemptirqsoff_start, cpu);
+
+                       if (!time_set)
+                               stop = ftrace_now(cpu);
+                       if (start) {
+                               long latency = ((long) (stop - start)) /
+                                   NSECS_PER_USECS;
+
+                               latency_hist(PREEMPTIRQSOFF_LATENCY, cpu,
+                                   latency, 0, stop, NULL);
+                       }
+                       per_cpu(hist_preemptirqsoff_counting, cpu) = 0;
+               }
+#endif
+       }
+}
+#endif
+
+#ifdef CONFIG_WAKEUP_LATENCY_HIST
+static DEFINE_RAW_SPINLOCK(wakeup_lock);
+static notrace void probe_sched_migrate_task(void *v, struct task_struct *task,
+       int cpu)
+{
+       int old_cpu = task_cpu(task);
+
+       if (cpu != old_cpu) {
+               unsigned long flags;
+               struct task_struct *cpu_wakeup_task;
+
+               raw_spin_lock_irqsave(&wakeup_lock, flags);
+
+               cpu_wakeup_task = per_cpu(wakeup_task, old_cpu);
+               if (task == cpu_wakeup_task) {
+                       put_task_struct(cpu_wakeup_task);
+                       per_cpu(wakeup_task, old_cpu) = NULL;
+                       cpu_wakeup_task = per_cpu(wakeup_task, cpu) = task;
+                       get_task_struct(cpu_wakeup_task);
+               }
+
+               raw_spin_unlock_irqrestore(&wakeup_lock, flags);
+       }
+}
+
+static notrace void probe_wakeup_latency_hist_start(void *v,
+       struct task_struct *p)
+{
+       unsigned long flags;
+       struct task_struct *curr = current;
+       int cpu = task_cpu(p);
+       struct task_struct *cpu_wakeup_task;
+
+       raw_spin_lock_irqsave(&wakeup_lock, flags);
+
+       cpu_wakeup_task = per_cpu(wakeup_task, cpu);
+
+       if (wakeup_pid) {
+               if ((cpu_wakeup_task && p->prio == cpu_wakeup_task->prio) ||
+                   p->prio == curr->prio)
+                       per_cpu(wakeup_sharedprio, cpu) = 1;
+               if (likely(wakeup_pid != task_pid_nr(p)))
+                       goto out;
+       } else {
+               if (likely(!rt_task(p)) ||
+                   (cpu_wakeup_task && p->prio > cpu_wakeup_task->prio) ||
+                   p->prio > curr->prio)
+                       goto out;
+               if ((cpu_wakeup_task && p->prio == cpu_wakeup_task->prio) ||
+                   p->prio == curr->prio)
+                       per_cpu(wakeup_sharedprio, cpu) = 1;
+       }
+
+       if (cpu_wakeup_task)
+               put_task_struct(cpu_wakeup_task);
+       cpu_wakeup_task = per_cpu(wakeup_task, cpu) = p;
+       get_task_struct(cpu_wakeup_task);
+       cpu_wakeup_task->preempt_timestamp_hist =
+               ftrace_now(raw_smp_processor_id());
+out:
+       raw_spin_unlock_irqrestore(&wakeup_lock, flags);
+}
+
+static notrace void probe_wakeup_latency_hist_stop(void *v,
+       bool preempt, struct task_struct *prev, struct task_struct *next)
+{
+       unsigned long flags;
+       int cpu = task_cpu(next);
+       long latency;
+       cycle_t stop;
+       struct task_struct *cpu_wakeup_task;
+
+       raw_spin_lock_irqsave(&wakeup_lock, flags);
+
+       cpu_wakeup_task = per_cpu(wakeup_task, cpu);
+
+       if (cpu_wakeup_task == NULL)
+               goto out;
+
+       /* Already running? */
+       if (unlikely(current == cpu_wakeup_task))
+               goto out_reset;
+
+       if (next != cpu_wakeup_task) {
+               if (next->prio < cpu_wakeup_task->prio)
+                       goto out_reset;
+
+               if (next->prio == cpu_wakeup_task->prio)
+                       per_cpu(wakeup_sharedprio, cpu) = 1;
+
+               goto out;
+       }
+
+       if (current->prio == cpu_wakeup_task->prio)
+               per_cpu(wakeup_sharedprio, cpu) = 1;
+
+       /*
+        * The task we are waiting for is about to be switched to.
+        * Calculate latency and store it in histogram.
+        */
+       stop = ftrace_now(raw_smp_processor_id());
+
+       latency = ((long) (stop - next->preempt_timestamp_hist)) /
+           NSECS_PER_USECS;
+
+       if (per_cpu(wakeup_sharedprio, cpu)) {
+               latency_hist(WAKEUP_LATENCY_SHAREDPRIO, cpu, latency, 0, stop,
+                   next);
+               per_cpu(wakeup_sharedprio, cpu) = 0;
+       } else {
+               latency_hist(WAKEUP_LATENCY, cpu, latency, 0, stop, next);
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+               if (timerandwakeup_enabled_data.enabled) {
+                       latency_hist(TIMERANDWAKEUP_LATENCY, cpu,
+                           next->timer_offset + latency, next->timer_offset,
+                           stop, next);
+               }
+#endif
+       }
+
+out_reset:
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+       next->timer_offset = 0;
+#endif
+       put_task_struct(cpu_wakeup_task);
+       per_cpu(wakeup_task, cpu) = NULL;
+out:
+       raw_spin_unlock_irqrestore(&wakeup_lock, flags);
+}
+#endif
+
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+static notrace void probe_hrtimer_interrupt(void *v, int cpu,
+       long long latency_ns, struct task_struct *curr,
+       struct task_struct *task)
+{
+       if (latency_ns <= 0 && task != NULL && rt_task(task) &&
+           (task->prio < curr->prio ||
+           (task->prio == curr->prio &&
+           !cpumask_test_cpu(cpu, &task->cpus_allowed)))) {
+               long latency;
+               cycle_t now;
+
+               if (missed_timer_offsets_pid) {
+                       if (likely(missed_timer_offsets_pid !=
+                           task_pid_nr(task)))
+                               return;
+               }
+
+               now = ftrace_now(cpu);
+               latency = (long) div_s64(-latency_ns, NSECS_PER_USECS);
+               latency_hist(MISSED_TIMER_OFFSETS, cpu, latency, latency, now,
+                   task);
+#ifdef CONFIG_WAKEUP_LATENCY_HIST
+               task->timer_offset = latency;
+#endif
+       }
+}
+#endif
+
+static __init int latency_hist_init(void)
+{
+       struct dentry *latency_hist_root = NULL;
+       struct dentry *dentry;
+#ifdef CONFIG_WAKEUP_LATENCY_HIST
+       struct dentry *dentry_sharedprio;
+#endif
+       struct dentry *entry;
+       struct dentry *enable_root;
+       int i = 0;
+       struct hist_data *my_hist;
+       char name[64];
+       char *cpufmt = "CPU%d";
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) || \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+       char *cpufmt_maxlatproc = "max_latency-CPU%d";
+       struct maxlatproc_data *mp = NULL;
+#endif
+
+       dentry = tracing_init_dentry();
+       latency_hist_root = debugfs_create_dir(latency_hist_dir_root, dentry);
+       enable_root = debugfs_create_dir("enable", latency_hist_root);
+
+#ifdef CONFIG_INTERRUPT_OFF_HIST
+       dentry = debugfs_create_dir(irqsoff_hist_dir, latency_hist_root);
+       for_each_possible_cpu(i) {
+               sprintf(name, cpufmt, i);
+               entry = debugfs_create_file(name, 0444, dentry,
+                   &per_cpu(irqsoff_hist, i), &latency_hist_fops);
+               my_hist = &per_cpu(irqsoff_hist, i);
+               atomic_set(&my_hist->hist_mode, 1);
+               my_hist->min_lat = LONG_MAX;
+       }
+       entry = debugfs_create_file("reset", 0644, dentry,
+           (void *)IRQSOFF_LATENCY, &latency_hist_reset_fops);
+#endif
+
+#ifdef CONFIG_PREEMPT_OFF_HIST
+       dentry = debugfs_create_dir(preemptoff_hist_dir,
+           latency_hist_root);
+       for_each_possible_cpu(i) {
+               sprintf(name, cpufmt, i);
+               entry = debugfs_create_file(name, 0444, dentry,
+                   &per_cpu(preemptoff_hist, i), &latency_hist_fops);
+               my_hist = &per_cpu(preemptoff_hist, i);
+               atomic_set(&my_hist->hist_mode, 1);
+               my_hist->min_lat = LONG_MAX;
+       }
+       entry = debugfs_create_file("reset", 0644, dentry,
+           (void *)PREEMPTOFF_LATENCY, &latency_hist_reset_fops);
+#endif
+
+#if defined(CONFIG_INTERRUPT_OFF_HIST) && defined(CONFIG_PREEMPT_OFF_HIST)
+       dentry = debugfs_create_dir(preemptirqsoff_hist_dir,
+           latency_hist_root);
+       for_each_possible_cpu(i) {
+               sprintf(name, cpufmt, i);
+               entry = debugfs_create_file(name, 0444, dentry,
+                   &per_cpu(preemptirqsoff_hist, i), &latency_hist_fops);
+               my_hist = &per_cpu(preemptirqsoff_hist, i);
+               atomic_set(&my_hist->hist_mode, 1);
+               my_hist->min_lat = LONG_MAX;
+       }
+       entry = debugfs_create_file("reset", 0644, dentry,
+           (void *)PREEMPTIRQSOFF_LATENCY, &latency_hist_reset_fops);
+#endif
+
+#if defined(CONFIG_INTERRUPT_OFF_HIST) || defined(CONFIG_PREEMPT_OFF_HIST)
+       entry = debugfs_create_file("preemptirqsoff", 0644,
+           enable_root, (void *)&preemptirqsoff_enabled_data,
+           &enable_fops);
+#endif
+
+#ifdef CONFIG_WAKEUP_LATENCY_HIST
+       dentry = debugfs_create_dir(wakeup_latency_hist_dir,
+           latency_hist_root);
+       dentry_sharedprio = debugfs_create_dir(
+           wakeup_latency_hist_dir_sharedprio, dentry);
+       for_each_possible_cpu(i) {
+               sprintf(name, cpufmt, i);
+
+               entry = debugfs_create_file(name, 0444, dentry,
+                   &per_cpu(wakeup_latency_hist, i),
+                   &latency_hist_fops);
+               my_hist = &per_cpu(wakeup_latency_hist, i);
+               atomic_set(&my_hist->hist_mode, 1);
+               my_hist->min_lat = LONG_MAX;
+
+               entry = debugfs_create_file(name, 0444, dentry_sharedprio,
+                   &per_cpu(wakeup_latency_hist_sharedprio, i),
+                   &latency_hist_fops);
+               my_hist = &per_cpu(wakeup_latency_hist_sharedprio, i);
+               atomic_set(&my_hist->hist_mode, 1);
+               my_hist->min_lat = LONG_MAX;
+
+               sprintf(name, cpufmt_maxlatproc, i);
+
+               mp = &per_cpu(wakeup_maxlatproc, i);
+               entry = debugfs_create_file(name, 0444, dentry, mp,
+                   &maxlatproc_fops);
+               clear_maxlatprocdata(mp);
+
+               mp = &per_cpu(wakeup_maxlatproc_sharedprio, i);
+               entry = debugfs_create_file(name, 0444, dentry_sharedprio, mp,
+                   &maxlatproc_fops);
+               clear_maxlatprocdata(mp);
+       }
+       entry = debugfs_create_file("pid", 0644, dentry,
+           (void *)&wakeup_pid, &pid_fops);
+       entry = debugfs_create_file("reset", 0644, dentry,
+           (void *)WAKEUP_LATENCY, &latency_hist_reset_fops);
+       entry = debugfs_create_file("reset", 0644, dentry_sharedprio,
+           (void *)WAKEUP_LATENCY_SHAREDPRIO, &latency_hist_reset_fops);
+       entry = debugfs_create_file("wakeup", 0644,
+           enable_root, (void *)&wakeup_latency_enabled_data,
+           &enable_fops);
+#endif
+
+#ifdef CONFIG_MISSED_TIMER_OFFSETS_HIST
+       dentry = debugfs_create_dir(missed_timer_offsets_dir,
+           latency_hist_root);
+       for_each_possible_cpu(i) {
+               sprintf(name, cpufmt, i);
+               entry = debugfs_create_file(name, 0444, dentry,
+                   &per_cpu(missed_timer_offsets, i), &latency_hist_fops);
+               my_hist = &per_cpu(missed_timer_offsets, i);
+               atomic_set(&my_hist->hist_mode, 1);
+               my_hist->min_lat = LONG_MAX;
+
+               sprintf(name, cpufmt_maxlatproc, i);
+               mp = &per_cpu(missed_timer_offsets_maxlatproc, i);
+               entry = debugfs_create_file(name, 0444, dentry, mp,
+                   &maxlatproc_fops);
+               clear_maxlatprocdata(mp);
+       }
+       entry = debugfs_create_file("pid", 0644, dentry,
+           (void *)&missed_timer_offsets_pid, &pid_fops);
+       entry = debugfs_create_file("reset", 0644, dentry,
+           (void *)MISSED_TIMER_OFFSETS, &latency_hist_reset_fops);
+       entry = debugfs_create_file("missed_timer_offsets", 0644,
+           enable_root, (void *)&missed_timer_offsets_enabled_data,
+           &enable_fops);
+#endif
+
+#if defined(CONFIG_WAKEUP_LATENCY_HIST) && \
+       defined(CONFIG_MISSED_TIMER_OFFSETS_HIST)
+       dentry = debugfs_create_dir(timerandwakeup_latency_hist_dir,
+           latency_hist_root);
+       for_each_possible_cpu(i) {
+               sprintf(name, cpufmt, i);
+               entry = debugfs_create_file(name, 0444, dentry,
+                   &per_cpu(timerandwakeup_latency_hist, i),
+                   &latency_hist_fops);
+               my_hist = &per_cpu(timerandwakeup_latency_hist, i);
+               atomic_set(&my_hist->hist_mode, 1);
+               my_hist->min_lat = LONG_MAX;
+
+               sprintf(name, cpufmt_maxlatproc, i);
+               mp = &per_cpu(timerandwakeup_maxlatproc, i);
+               entry = debugfs_create_file(name, 0444, dentry, mp,
+                   &maxlatproc_fops);
+               clear_maxlatprocdata(mp);
+       }
+       entry = debugfs_create_file("reset", 0644, dentry,
+           (void *)TIMERANDWAKEUP_LATENCY, &latency_hist_reset_fops);
+       entry = debugfs_create_file("timerandwakeup", 0644,
+           enable_root, (void *)&timerandwakeup_enabled_data,
+           &enable_fops);
+#endif
+       return 0;
+}
+
+device_initcall(latency_hist_init);
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8aef4e63ac57..cdb7742283e5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1652,6 +1652,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
        struct task_struct *tsk = current;
 
        entry->preempt_count            = pc & 0xff;
+       entry->preempt_lazy_count       = preempt_lazy_count();
        entry->pid                      = (tsk) ? tsk->pid : 0;
        entry->flags =
 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
@@ -1661,8 +1662,11 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
 #endif
                ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
                ((pc & SOFTIRQ_OFFSET) ? TRACE_FLAG_SOFTIRQ : 0) |
-               (tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) |
+               (tif_need_resched_now() ? TRACE_FLAG_NEED_RESCHED : 0) |
+               (need_resched_lazy() ? TRACE_FLAG_NEED_RESCHED_LAZY : 0) |
                (test_preempt_need_resched() ? TRACE_FLAG_PREEMPT_RESCHED : 0);
+
+       entry->migrate_disable = (tsk) ? __migrate_disabled(tsk) & 0xFF : 0;
 }
 EXPORT_SYMBOL_GPL(tracing_generic_entry_update);
 
@@ -2555,14 +2559,17 @@ get_total_entries(struct trace_buffer *buf,
 
 static void print_lat_help_header(struct seq_file *m)
 {
-       seq_puts(m, "#                  _------=> CPU#            \n"
-                   "#                 / _-----=> irqs-off        \n"
-                   "#                | / _----=> need-resched    \n"
-                   "#                || / _---=> hardirq/softirq \n"
-                   "#                ||| / _--=> preempt-depth   \n"
-                   "#                |||| /     delay            \n"
-                   "#  cmd     pid   ||||| time  |   caller      \n"
-                   "#     \\   /      |||||  \\    |   /         \n");
+       seq_puts(m, "#                  _--------=> CPU#              \n"
+                   "#                 / _-------=> irqs-off          \n"
+                   "#                | / _------=> need-resched      \n"
+                   "#                || / _-----=> need-resched_lazy \n"
+                   "#                ||| / _----=> hardirq/softirq   \n"
+                   "#                |||| / _---=> preempt-depth     \n"
+                   "#                ||||| / _--=> preempt-lazy-depth\n"
+                   "#                |||||| / _-=> migrate-disable   \n"
+                   "#                ||||||| /     delay             \n"
+                   "# cmd     pid    |||||||| time   |  caller       \n"
+                   "#     \\   /      ||||||||   \\    |  /            \n");
 }
 
 static void print_event_info(struct trace_buffer *buf, struct seq_file *m)
@@ -2588,11 +2595,14 @@ static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file
        print_event_info(buf, m);
        seq_puts(m, "#                              _-----=> irqs-off\n"
                    "#                             / _----=> need-resched\n"
-                   "#                            | / _---=> hardirq/softirq\n"
-                   "#                            || / _--=> preempt-depth\n"
-                   "#                            ||| /     delay\n"
-                   "#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION\n"
-                   "#              | |       |   ||||       |         |\n");
+                   "#                            |/  _-----=> need-resched_lazy\n"
+                   "#                            || / _---=> hardirq/softirq\n"
+                   "#                            ||| / _--=> preempt-depth\n"
+                   "#                            |||| / _-=> preempt-lazy-depth\n"
+                   "#                            ||||| / _-=> migrate-disable   \n"
+                   "#                            |||||| /    delay\n"
+                   "#           TASK-PID   CPU#  |||||||   TIMESTAMP  FUNCTION\n"
+                   "#              | |       |   |||||||      |         |\n");
 }
 
 void
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 919d9d07686f..3bf86ece683c 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -117,6 +117,7 @@ struct kretprobe_trace_entry_head {
  *  NEED_RESCHED       - reschedule is requested
  *  HARDIRQ            - inside an interrupt handler
  *  SOFTIRQ            - inside a softirq handler
+ *  NEED_RESCHED_LAZY  - lazy reschedule is requested
  */
 enum trace_flag_type {
        TRACE_FLAG_IRQS_OFF             = 0x01,
@@ -125,6 +126,7 @@ enum trace_flag_type {
        TRACE_FLAG_HARDIRQ              = 0x08,
        TRACE_FLAG_SOFTIRQ              = 0x10,
        TRACE_FLAG_PREEMPT_RESCHED      = 0x20,
+       TRACE_FLAG_NEED_RESCHED_LAZY    = 0x40,
 };
 
 #define TRACE_BUF_SIZE         1024
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 996f0fd34312..5bd79b347398 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -188,6 +188,8 @@ static int trace_define_common_fields(void)
        __common_field(unsigned char, flags);
        __common_field(unsigned char, preempt_count);
        __common_field(int, pid);
+       __common_field(unsigned short, migrate_disable);
+       __common_field(unsigned short, padding);
 
        return ret;
 }
@@ -244,6 +246,14 @@ void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,
 
        local_save_flags(fbuffer->flags);
        fbuffer->pc = preempt_count();
+       /*
+        * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables
+        * preemption (adding one to the preempt_count). Since we are
+        * interested in the preempt_count at the time the tracepoint was
+        * hit, we need to subtract one to offset the increment.
+        */
+       if (IS_ENABLED(CONFIG_PREEMPT))
+               fbuffer->pc--;
        fbuffer->trace_file = trace_file;
 
        fbuffer->event =
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index be3222b7d72e..553e71254ad6 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -13,6 +13,7 @@
 #include <linux/uaccess.h>
 #include <linux/module.h>
 #include <linux/ftrace.h>
+#include <trace/events/hist.h>
 
 #include "trace.h"
 
@@ -424,11 +425,13 @@ void start_critical_timings(void)
 {
        if (preempt_trace() || irq_trace())
                start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
+       trace_preemptirqsoff_hist_rcuidle(TRACE_START, 1);
 }
 EXPORT_SYMBOL_GPL(start_critical_timings);
 
 void stop_critical_timings(void)
 {
+       trace_preemptirqsoff_hist_rcuidle(TRACE_STOP, 0);
        if (preempt_trace() || irq_trace())
                stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
 }
@@ -438,6 +441,7 @@ EXPORT_SYMBOL_GPL(stop_critical_timings);
 #ifdef CONFIG_PROVE_LOCKING
 void time_hardirqs_on(unsigned long a0, unsigned long a1)
 {
+       trace_preemptirqsoff_hist_rcuidle(IRQS_ON, 0);
        if (!preempt_trace() && irq_trace())
                stop_critical_timing(a0, a1);
 }
@@ -446,6 +450,7 @@ void time_hardirqs_off(unsigned long a0, unsigned long a1)
 {
        if (!preempt_trace() && irq_trace())
                start_critical_timing(a0, a1);
+       trace_preemptirqsoff_hist_rcuidle(IRQS_OFF, 1);
 }
 
 #else /* !CONFIG_PROVE_LOCKING */
@@ -471,6 +476,7 @@ inline void print_irqtrace_events(struct task_struct *curr)
  */
 void trace_hardirqs_on(void)
 {
+       trace_preemptirqsoff_hist(IRQS_ON, 0);
        if (!preempt_trace() && irq_trace())
                stop_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
 }
@@ -480,11 +486,13 @@ void trace_hardirqs_off(void)
 {
        if (!preempt_trace() && irq_trace())
                start_critical_timing(CALLER_ADDR0, CALLER_ADDR1);
+       trace_preemptirqsoff_hist(IRQS_OFF, 1);
 }
 EXPORT_SYMBOL(trace_hardirqs_off);
 
 __visible void trace_hardirqs_on_caller(unsigned long caller_addr)
 {
+       trace_preemptirqsoff_hist(IRQS_ON, 0);
        if (!preempt_trace() && irq_trace())
                stop_critical_timing(CALLER_ADDR0, caller_addr);
 }
@@ -494,6 +502,7 @@ __visible void trace_hardirqs_off_caller(unsigned long caller_addr)
 {
        if (!preempt_trace() && irq_trace())
                start_critical_timing(CALLER_ADDR0, caller_addr);
+       trace_preemptirqsoff_hist(IRQS_OFF, 1);
 }
 EXPORT_SYMBOL(trace_hardirqs_off_caller);
 
@@ -503,12 +512,14 @@ EXPORT_SYMBOL(trace_hardirqs_off_caller);
 #ifdef CONFIG_PREEMPT_TRACER
 void trace_preempt_on(unsigned long a0, unsigned long a1)
 {
+       trace_preemptirqsoff_hist(PREEMPT_ON, 0);
        if (preempt_trace() && !irq_trace())
                stop_critical_timing(a0, a1);
 }
 
 void trace_preempt_off(unsigned long a0, unsigned long a1)
 {
+       trace_preemptirqsoff_hist(PREEMPT_ON, 1);
        if (preempt_trace() && !irq_trace())
                start_critical_timing(a0, a1);
 }
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 282982195e09..9f19d839a756 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -386,6 +386,7 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 {
        char hardsoft_irq;
        char need_resched;
+       char need_resched_lazy;
        char irqs_off;
        int hardirq;
        int softirq;
@@ -413,6 +414,8 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
                need_resched = '.';
                break;
        }
+       need_resched_lazy =
+               (entry->flags & TRACE_FLAG_NEED_RESCHED_LAZY) ? 'L' : '.';
 
        hardsoft_irq =
                (hardirq && softirq) ? 'H' :
@@ -420,14 +423,25 @@ int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
                softirq ? 's' :
                '.';
 
-       trace_seq_printf(s, "%c%c%c",
-                        irqs_off, need_resched, hardsoft_irq);
+       trace_seq_printf(s, "%c%c%c%c",
+                        irqs_off, need_resched, need_resched_lazy,
+                        hardsoft_irq);
 
        if (entry->preempt_count)
                trace_seq_printf(s, "%x", entry->preempt_count);
        else
                trace_seq_putc(s, '.');
 
+       if (entry->preempt_lazy_count)
+               trace_seq_printf(s, "%x", entry->preempt_lazy_count);
+       else
+               trace_seq_putc(s, '.');
+
+       if (entry->migrate_disable)
+               trace_seq_printf(s, "%x", entry->migrate_disable);
+       else
+               trace_seq_putc(s, '.');
+
        return !trace_seq_has_overflowed(s);
 }
 
diff --git a/kernel/user.c b/kernel/user.c
index b069ccbfb0b0..1a2e88e98b5e 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -161,11 +161,11 @@ void free_uid(struct user_struct *up)
        if (!up)
                return;
 
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
        if (atomic_dec_and_lock(&up->__count, &uidhash_lock))
                free_user(up, flags);
        else
-               local_irq_restore(flags);
+               local_irq_restore_nort(flags);
 }
 
 struct user_struct *alloc_uid(kuid_t uid)
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index c1e0b5f429b6..fa2e079cc314 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -299,6 +299,8 @@ static int is_softlockup(unsigned long touch_ts)
 
 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 
+static DEFINE_RAW_SPINLOCK(watchdog_output_lock);
+
 static struct perf_event_attr wd_hw_attr = {
        .type           = PERF_TYPE_HARDWARE,
        .config         = PERF_COUNT_HW_CPU_CYCLES,
@@ -332,6 +334,13 @@ static void watchdog_overflow_callback(struct perf_event *event,
                /* only print hardlockups once */
                if (__this_cpu_read(hard_watchdog_warn) == true)
                        return;
+               /*
+                * If early-printk is enabled then make sure we do not
+                * lock up in printk() and kill console logging:
+                */
+               printk_kill();
+
+               raw_spin_lock(&watchdog_output_lock);
 
                pr_emerg("Watchdog detected hard LOCKUP on cpu %d", this_cpu);
                print_modules();
@@ -349,8 +358,9 @@ static void watchdog_overflow_callback(struct perf_event *event,
                                !test_and_set_bit(0, &hardlockup_allcpu_dumped))
                        trigger_allbutself_cpu_backtrace();
 
+               raw_spin_unlock(&watchdog_output_lock);
                if (hardlockup_panic)
-                       panic("Hard LOCKUP");
+                       nmi_panic(regs, "Hard LOCKUP");
 
                __this_cpu_write(hard_watchdog_warn, true);
                return;
@@ -496,6 +506,7 @@ static void watchdog_enable(unsigned int cpu)
        /* kick off the timer for the hardlockup detector */
        hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
        hrtimer->function = watchdog_timer_fn;
+       hrtimer->irqsafe = 1;
 
        /* Enable the perf event */
        watchdog_nmi_enable(cpu);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 85555eb4d3cb..79f33789f330 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -48,6 +48,8 @@
 #include <linux/nodemask.h>
 #include <linux/moduleparam.h>
 #include <linux/uaccess.h>
+#include <linux/locallock.h>
+#include <linux/delay.h>
 
 #include "workqueue_internal.h"
 
@@ -122,11 +124,16 @@ enum {
  *    cpu or grabbing pool->lock is enough for read access.  If
  *    POOL_DISASSOCIATED is set, it's identical to L.
  *
+ *    On RT we need the extra protection via rt_lock_idle_list() for
+ *    the list manipulations against read access from
+ *    wq_worker_sleeping(). All other places are nicely serialized via
+ *    pool->lock.
+ *
  * A: pool->attach_mutex protected.
  *
  * PL: wq_pool_mutex protected.
  *
- * PR: wq_pool_mutex protected for writes.  Sched-RCU protected for reads.
+ * PR: wq_pool_mutex protected for writes.  RCU protected for reads.
  *
  * PW: wq_pool_mutex and wq->mutex protected for writes.  Either for reads.
  *
@@ -135,7 +142,7 @@ enum {
  *
  * WQ: wq->mutex protected.
  *
- * WR: wq->mutex protected for writes.  Sched-RCU protected for reads.
+ * WR: wq->mutex protected for writes.  RCU protected for reads.
  *
  * MD: wq_mayday_lock protected.
  */
@@ -183,7 +190,7 @@ struct worker_pool {
        atomic_t                nr_running ____cacheline_aligned_in_smp;
 
        /*
-        * Destruction of pool is sched-RCU protected to allow dereferences
+        * Destruction of pool is RCU protected to allow dereferences
         * from get_work_pool().
         */
        struct rcu_head         rcu;
@@ -212,7 +219,7 @@ struct pool_workqueue {
        /*
         * Release of unbound pwq is punted to system_wq.  See put_pwq()
         * and pwq_unbound_release_workfn() for details.  pool_workqueue
-        * itself is also sched-RCU protected so that the first pwq can be
+        * itself is also RCU protected so that the first pwq can be
         * determined without grabbing wq->mutex.
         */
        struct work_struct      unbound_release_work;
@@ -332,6 +339,8 @@ EXPORT_SYMBOL_GPL(system_power_efficient_wq);
 struct workqueue_struct *system_freezable_power_efficient_wq __read_mostly;
 EXPORT_SYMBOL_GPL(system_freezable_power_efficient_wq);
 
+static DEFINE_LOCAL_IRQ_LOCK(pendingb_lock);
+
 static int worker_thread(void *__worker);
 static void workqueue_sysfs_unregister(struct workqueue_struct *wq);
 
@@ -339,20 +348,20 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq);
 #include <trace/events/workqueue.h>
 
 #define assert_rcu_or_pool_mutex()                                     \
-       RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held() &&                 \
+       RCU_LOCKDEP_WARN(!rcu_read_lock_held() &&                       \
                         !lockdep_is_held(&wq_pool_mutex),              \
-                        "sched RCU or wq_pool_mutex should be held")
+                        "RCU or wq_pool_mutex should be held")
 
 #define assert_rcu_or_wq_mutex(wq)                                     \
-       RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held() &&                 \
+       RCU_LOCKDEP_WARN(!rcu_read_lock_held() &&                       \
                         !lockdep_is_held(&wq->mutex),                  \
-                        "sched RCU or wq->mutex should be held")
+                        "RCU or wq->mutex should be held")
 
 #define assert_rcu_or_wq_mutex_or_pool_mutex(wq)                       \
-       RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held() &&                 \
+       RCU_LOCKDEP_WARN(!rcu_read_lock_held() &&                       \
                         !lockdep_is_held(&wq->mutex) &&                \
                         !lockdep_is_held(&wq_pool_mutex),              \
-                        "sched RCU, wq->mutex or wq_pool_mutex should be held")
+                        "RCU, wq->mutex or wq_pool_mutex should be held")
 
 #define for_each_cpu_worker_pool(pool, cpu)                            \
        for ((pool) = &per_cpu(cpu_worker_pools, cpu)[0];               \
@@ -364,7 +373,7 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq);
  * @pool: iteration cursor
  * @pi: integer used for iteration
  *
- * This must be called either with wq_pool_mutex held or sched RCU read
+ * This must be called either with wq_pool_mutex held or RCU read
  * locked.  If the pool needs to be used beyond the locking in effect, the
  * caller is responsible for guaranteeing that the pool stays online.
  *
@@ -396,7 +405,7 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq);
  * @pwq: iteration cursor
  * @wq: the target workqueue
  *
- * This must be called either with wq->mutex held or sched RCU read locked.
+ * This must be called either with wq->mutex held or RCU read locked.
  * If the pwq needs to be used beyond the locking in effect, the caller is
  * responsible for guaranteeing that the pwq stays online.
  *
@@ -408,6 +417,31 @@ static void workqueue_sysfs_unregister(struct workqueue_struct *wq);
                if (({ assert_rcu_or_wq_mutex(wq); false; })) { }       \
                else
 
+#ifdef CONFIG_PREEMPT_RT_BASE
+static inline void rt_lock_idle_list(struct worker_pool *pool)
+{
+       preempt_disable();
+}
+static inline void rt_unlock_idle_list(struct worker_pool *pool)
+{
+       preempt_enable();
+}
+static inline void sched_lock_idle_list(struct worker_pool *pool) { }
+static inline void sched_unlock_idle_list(struct worker_pool *pool) { }
+#else
+static inline void rt_lock_idle_list(struct worker_pool *pool) { }
+static inline void rt_unlock_idle_list(struct worker_pool *pool) { }
+static inline void sched_lock_idle_list(struct worker_pool *pool)
+{
+       spin_lock_irq(&pool->lock);
+}
+static inline void sched_unlock_idle_list(struct worker_pool *pool)
+{
+       spin_unlock_irq(&pool->lock);
+}
+#endif
+
+
 #ifdef CONFIG_DEBUG_OBJECTS_WORK
 
 static struct debug_obj_descr work_debug_descr;
@@ -558,7 +592,7 @@ static int worker_pool_assign_id(struct worker_pool *pool)
  * @wq: the target workqueue
  * @node: the node ID
  *
- * This must be called with any of wq_pool_mutex, wq->mutex or sched RCU
+ * This must be called with any of wq_pool_mutex, wq->mutex or RCU
  * read locked.
  * If the pwq needs to be used beyond the locking in effect, the caller is
  * responsible for guaranteeing that the pwq stays online.
@@ -702,8 +736,8 @@ static struct pool_workqueue *get_work_pwq(struct work_struct *work)
  * @work: the work item of interest
  *
  * Pools are created and destroyed under wq_pool_mutex, and allows read
- * access under sched-RCU read lock.  As such, this function should be
- * called under wq_pool_mutex or with preemption disabled.
+ * access under RCU read lock.  As such, this function should be
+ * called under wq_pool_mutex or inside of a rcu_read_lock() region.
  *
  * All fields of the returned pool are accessible as long as the above
  * mentioned locking is in effect.  If the returned pool needs to be used
@@ -840,51 +874,44 @@ static struct worker *first_idle_worker(struct worker_pool *pool)
  */
 static void wake_up_worker(struct worker_pool *pool)
 {
-       struct worker *worker = first_idle_worker(pool);
+       struct worker *worker;
+
+       rt_lock_idle_list(pool);
+
+       worker = first_idle_worker(pool);
 
        if (likely(worker))
                wake_up_process(worker->task);
+
+       rt_unlock_idle_list(pool);
 }
 
 /**
- * wq_worker_waking_up - a worker is waking up
- * @task: task waking up
- * @cpu: CPU @task is waking up to
+ * wq_worker_running - a worker is running again
+ * @task: task returning from sleep
  *
- * This function is called during try_to_wake_up() when a worker is
- * being awoken.
- *
- * CONTEXT:
- * spin_lock_irq(rq->lock)
+ * This function is called when a worker returns from schedule()
  */
-void wq_worker_waking_up(struct task_struct *task, int cpu)
+void wq_worker_running(struct task_struct *task)
 {
        struct worker *worker = kthread_data(task);
 
-       if (!(worker->flags & WORKER_NOT_RUNNING)) {
-               WARN_ON_ONCE(worker->pool->cpu != cpu);
+       if (!worker->sleeping)
+               return;
+       if (!(worker->flags & WORKER_NOT_RUNNING))
                atomic_inc(&worker->pool->nr_running);
-       }
+       worker->sleeping = 0;
 }
 
 /**
  * wq_worker_sleeping - a worker is going to sleep
  * @task: task going to sleep
- * @cpu: CPU in question, must be the current CPU number
- *
- * This function is called during schedule() when a busy worker is
- * going to sleep.  Worker on the same cpu can be woken up by
- * returning pointer to its task.
- *
- * CONTEXT:
- * spin_lock_irq(rq->lock)
- *
- * Return:
- * Worker task on @cpu to wake up, %NULL if none.
+ * This function is called from schedule() when a busy worker is
+ * going to sleep.
  */
-struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu)
+void wq_worker_sleeping(struct task_struct *task)
 {
-       struct worker *worker = kthread_data(task), *to_wakeup = NULL;
+       struct worker *worker = kthread_data(task);
        struct worker_pool *pool;
 
        /*
@@ -893,29 +920,26 @@ struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu)
         * checking NOT_RUNNING.
         */
        if (worker->flags & WORKER_NOT_RUNNING)
-               return NULL;
+               return;
 
        pool = worker->pool;
 
-       /* this can only happen on the local cpu */
-       if (WARN_ON_ONCE(cpu != raw_smp_processor_id() || pool->cpu != cpu))
-               return NULL;
+       if (WARN_ON_ONCE(worker->sleeping))
+               return;
+
+       worker->sleeping = 1;
 
        /*
         * The counterpart of the following dec_and_test, implied mb,
         * worklist not empty test sequence is in insert_work().
         * Please read comment there.
-        *
-        * NOT_RUNNING is clear.  This means that we're bound to and
-        * running on the local cpu w/ rq lock held and preemption
-        * disabled, which in turn means that none else could be
-        * manipulating idle_list, so dereferencing idle_list without pool
-        * lock is safe.
         */
        if (atomic_dec_and_test(&pool->nr_running) &&
-           !list_empty(&pool->worklist))
-               to_wakeup = first_idle_worker(pool);
-       return to_wakeup ? to_wakeup->task : NULL;
+           !list_empty(&pool->worklist)) {
+               sched_lock_idle_list(pool);
+               wake_up_worker(pool);
+               sched_unlock_idle_list(pool);
+       }
 }
 
 /**
@@ -1109,12 +1133,14 @@ static void put_pwq_unlocked(struct pool_workqueue *pwq)
 {
        if (pwq) {
                /*
-                * As both pwqs and pools are sched-RCU protected, the
+                * As both pwqs and pools are RCU protected, the
                 * following lock operations are safe.
                 */
-               spin_lock_irq(&pwq->pool->lock);
+               rcu_read_lock();
+               local_spin_lock_irq(pendingb_lock, &pwq->pool->lock);
                put_pwq(pwq);
-               spin_unlock_irq(&pwq->pool->lock);
+               local_spin_unlock_irq(pendingb_lock, &pwq->pool->lock);
+               rcu_read_unlock();
        }
 }
 
@@ -1216,7 +1242,7 @@ static int try_to_grab_pending(struct work_struct *work, bool is_dwork,
        struct worker_pool *pool;
        struct pool_workqueue *pwq;
 
-       local_irq_save(*flags);
+       local_lock_irqsave(pendingb_lock, *flags);
 
        /* try to steal the timer if it exists */
        if (is_dwork) {
@@ -1235,6 +1261,7 @@ static int try_to_grab_pending(struct work_struct *work, bool is_dwork,
        if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work)))
                return 0;
 
+       rcu_read_lock();
        /*
         * The queueing is in progress, or it is already queued. Try to
         * steal it from ->worklist without clearing WORK_STRUCT_PENDING.
@@ -1273,14 +1300,16 @@ static int try_to_grab_pending(struct work_struct *work, bool is_dwork,
                set_work_pool_and_keep_pending(work, pool->id);
 
                spin_unlock(&pool->lock);
+               rcu_read_unlock();
                return 1;
        }
        spin_unlock(&pool->lock);
 fail:
-       local_irq_restore(*flags);
+       rcu_read_unlock();
+       local_unlock_irqrestore(pendingb_lock, *flags);
        if (work_is_canceling(work))
                return -ENOENT;
-       cpu_relax();
+       cpu_chill();
        return -EAGAIN;
 }
 
@@ -1349,7 +1378,7 @@ static void __queue_work(int cpu, struct workqueue_struct *wq,
         * queued or lose PENDING.  Grabbing PENDING and queueing should
         * happen with IRQ disabled.
         */
-       WARN_ON_ONCE(!irqs_disabled());
+       WARN_ON_ONCE_NONRT(!irqs_disabled());
 
        debug_work_activate(work);
 
@@ -1357,6 +1386,8 @@ static void __queue_work(int cpu, struct workqueue_struct *wq,
        if (unlikely(wq->flags & __WQ_DRAINING) &&
            WARN_ON_ONCE(!is_chained_work(wq)))
                return;
+
+       rcu_read_lock();
 retry:
        if (req_cpu == WORK_CPU_UNBOUND)
                cpu = raw_smp_processor_id();
@@ -1413,10 +1444,8 @@ static void __queue_work(int cpu, struct workqueue_struct *wq,
        /* pwq determined, queue */
        trace_workqueue_queue_work(req_cpu, pwq, work);
 
-       if (WARN_ON(!list_empty(&work->entry))) {
-               spin_unlock(&pwq->pool->lock);
-               return;
-       }
+       if (WARN_ON(!list_empty(&work->entry)))
+               goto out;
 
        pwq->nr_in_flight[pwq->work_color]++;
        work_flags = work_color_to_flags(pwq->work_color);
@@ -1432,7 +1461,9 @@ static void __queue_work(int cpu, struct workqueue_struct *wq,
 
        insert_work(pwq, work, worklist, work_flags);
 
+out:
        spin_unlock(&pwq->pool->lock);
+       rcu_read_unlock();
 }
 
 /**
@@ -1452,14 +1483,14 @@ bool queue_work_on(int cpu, struct workqueue_struct *wq,
        bool ret = false;
        unsigned long flags;
 
-       local_irq_save(flags);
+       local_lock_irqsave(pendingb_lock,flags);
 
        if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
                __queue_work(cpu, wq, work);
                ret = true;
        }
 
-       local_irq_restore(flags);
+       local_unlock_irqrestore(pendingb_lock, flags);
        return ret;
 }
 EXPORT_SYMBOL(queue_work_on);
@@ -1527,14 +1558,14 @@ bool queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
        unsigned long flags;
 
        /* read the comment in __queue_work() */
-       local_irq_save(flags);
+       local_lock_irqsave(pendingb_lock, flags);
 
        if (!test_and_set_bit(WORK_STRUCT_PENDING_BIT, work_data_bits(work))) {
                __queue_delayed_work(cpu, wq, dwork, delay);
                ret = true;
        }
 
-       local_irq_restore(flags);
+       local_unlock_irqrestore(pendingb_lock, flags);
        return ret;
 }
 EXPORT_SYMBOL(queue_delayed_work_on);
@@ -1569,7 +1600,7 @@ bool mod_delayed_work_on(int cpu, struct workqueue_struct *wq,
 
        if (likely(ret >= 0)) {
                __queue_delayed_work(cpu, wq, dwork, delay);
-               local_irq_restore(flags);
+               local_unlock_irqrestore(pendingb_lock, flags);
        }
 
        /* -ENOENT from try_to_grab_pending() becomes %true */
@@ -1602,7 +1633,9 @@ static void worker_enter_idle(struct worker *worker)
        worker->last_active = jiffies;
 
        /* idle_list is LIFO */
+       rt_lock_idle_list(pool);
        list_add(&worker->entry, &pool->idle_list);
+       rt_unlock_idle_list(pool);
 
        if (too_many_workers(pool) && !timer_pending(&pool->idle_timer))
                mod_timer(&pool->idle_timer, jiffies + IDLE_WORKER_TIMEOUT);
@@ -1635,7 +1668,9 @@ static void worker_leave_idle(struct worker *worker)
                return;
        worker_clr_flags(worker, WORKER_IDLE);
        pool->nr_idle--;
+       rt_lock_idle_list(pool);
        list_del_init(&worker->entry);
+       rt_unlock_idle_list(pool);
 }
 
 static struct worker *alloc_worker(int node)
@@ -1801,7 +1836,9 @@ static void destroy_worker(struct worker *worker)
        pool->nr_workers--;
        pool->nr_idle--;
 
+       rt_lock_idle_list(pool);
        list_del_init(&worker->entry);
+       rt_unlock_idle_list(pool);
        worker->flags |= WORKER_DIE;
        wake_up_process(worker->task);
 }
@@ -2711,14 +2748,14 @@ static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr)
 
        might_sleep();
 
-       local_irq_disable();
+       rcu_read_lock();
        pool = get_work_pool(work);
        if (!pool) {
-               local_irq_enable();
+               rcu_read_unlock();
                return false;
        }
 
-       spin_lock(&pool->lock);
+       spin_lock_irq(&pool->lock);
        /* see the comment in try_to_grab_pending() with the same code */
        pwq = get_work_pwq(work);
        if (pwq) {
@@ -2745,10 +2782,11 @@ static bool start_flush_work(struct work_struct *work, struct wq_barrier *barr)
        else
                lock_map_acquire_read(&pwq->wq->lockdep_map);
        lock_map_release(&pwq->wq->lockdep_map);
-
+       rcu_read_unlock();
        return true;
 already_gone:
        spin_unlock_irq(&pool->lock);
+       rcu_read_unlock();
        return false;
 }
 
@@ -2835,7 +2873,7 @@ static bool __cancel_work_timer(struct work_struct *work, bool is_dwork)
 
        /* tell other tasks trying to grab @work to back off */
        mark_work_canceling(work);
-       local_irq_restore(flags);
+       local_unlock_irqrestore(pendingb_lock, flags);
 
        flush_work(work);
        clear_work_data(work);
@@ -2890,10 +2928,10 @@ EXPORT_SYMBOL_GPL(cancel_work_sync);
  */
 bool flush_delayed_work(struct delayed_work *dwork)
 {
-       local_irq_disable();
+       local_lock_irq(pendingb_lock);
        if (del_timer_sync(&dwork->timer))
                __queue_work(dwork->cpu, dwork->wq, &dwork->work);
-       local_irq_enable();
+       local_unlock_irq(pendingb_lock);
        return flush_work(&dwork->work);
 }
 EXPORT_SYMBOL(flush_delayed_work);
@@ -2928,7 +2966,7 @@ bool cancel_delayed_work(struct delayed_work *dwork)
 
        set_work_pool_and_clear_pending(&dwork->work,
                                        get_work_pool_id(&dwork->work));
-       local_irq_restore(flags);
+       local_unlock_irqrestore(pendingb_lock, flags);
        return ret;
 }
 EXPORT_SYMBOL(cancel_delayed_work);
@@ -3155,7 +3193,7 @@ static void rcu_free_pool(struct rcu_head *rcu)
  * put_unbound_pool - put a worker_pool
  * @pool: worker_pool to put
  *
- * Put @pool.  If its refcnt reaches zero, it gets destroyed in sched-RCU
+ * Put @pool.  If its refcnt reaches zero, it gets destroyed in RCU
  * safe manner.  get_unbound_pool() calls this function on its failure path
  * and this function should be able to release pools which went through,
  * successfully or not, init_worker_pool().
@@ -3209,8 +3247,8 @@ static void put_unbound_pool(struct worker_pool *pool)
        del_timer_sync(&pool->idle_timer);
        del_timer_sync(&pool->mayday_timer);
 
-       /* sched-RCU protected to allow dereferences from get_work_pool() */
-       call_rcu_sched(&pool->rcu, rcu_free_pool);
+       /* RCU protected to allow dereferences from get_work_pool() */
+       call_rcu(&pool->rcu, rcu_free_pool);
 }
 
 /**
@@ -3317,14 +3355,14 @@ static void pwq_unbound_release_workfn(struct work_struct *work)
        put_unbound_pool(pool);
        mutex_unlock(&wq_pool_mutex);
 
-       call_rcu_sched(&pwq->rcu, rcu_free_pwq);
+       call_rcu(&pwq->rcu, rcu_free_pwq);
 
        /*
         * If we're the last pwq going away, @wq is already dead and no one
         * is gonna access it anymore.  Schedule RCU free.
         */
        if (is_last)
-               call_rcu_sched(&wq->rcu, rcu_free_wq);
+               call_rcu(&wq->rcu, rcu_free_wq);
 }
 
 /**
@@ -3991,7 +4029,7 @@ void destroy_workqueue(struct workqueue_struct *wq)
                 * The base ref is never dropped on per-cpu pwqs.  Directly
                 * schedule RCU free.
                 */
-               call_rcu_sched(&wq->rcu, rcu_free_wq);
+               call_rcu(&wq->rcu, rcu_free_wq);
        } else {
                /*
                 * We're the sole accessor of @wq at this point.  Directly
@@ -4085,7 +4123,8 @@ bool workqueue_congested(int cpu, struct workqueue_struct *wq)
        struct pool_workqueue *pwq;
        bool ret;
 
-       rcu_read_lock_sched();
+       rcu_read_lock();
+       preempt_disable();
 
        if (cpu == WORK_CPU_UNBOUND)
                cpu = smp_processor_id();
@@ -4096,7 +4135,8 @@ bool workqueue_congested(int cpu, struct workqueue_struct *wq)
                pwq = unbound_pwq_by_node(wq, cpu_to_node(cpu));
 
        ret = !list_empty(&pwq->delayed_works);
-       rcu_read_unlock_sched();
+       preempt_enable();
+       rcu_read_unlock();
 
        return ret;
 }
@@ -4122,15 +4162,15 @@ unsigned int work_busy(struct work_struct *work)
        if (work_pending(work))
                ret |= WORK_BUSY_PENDING;
 
-       local_irq_save(flags);
+       rcu_read_lock();
        pool = get_work_pool(work);
        if (pool) {
-               spin_lock(&pool->lock);
+               spin_lock_irqsave(&pool->lock, flags);
                if (find_worker_executing_work(pool, work))
                        ret |= WORK_BUSY_RUNNING;
-               spin_unlock(&pool->lock);
+               spin_unlock_irqrestore(&pool->lock, flags);
        }
-       local_irq_restore(flags);
+       rcu_read_unlock();
 
        return ret;
 }
@@ -4319,7 +4359,7 @@ void show_workqueue_state(void)
        unsigned long flags;
        int pi;
 
-       rcu_read_lock_sched();
+       rcu_read_lock();
 
        pr_info("Showing busy workqueues and worker pools:\n");
 
@@ -4370,7 +4410,7 @@ void show_workqueue_state(void)
                spin_unlock_irqrestore(&pool->lock, flags);
        }
 
-       rcu_read_unlock_sched();
+       rcu_read_unlock();
 }
 
 /*
@@ -4731,16 +4771,16 @@ bool freeze_workqueues_busy(void)
                 * nr_active is monotonically decreasing.  It's safe
                 * to peek without lock.
                 */
-               rcu_read_lock_sched();
+               rcu_read_lock();
                for_each_pwq(pwq, wq) {
                        WARN_ON_ONCE(pwq->nr_active < 0);
                        if (pwq->nr_active) {
                                busy = true;
-                               rcu_read_unlock_sched();
+                               rcu_read_unlock();
                                goto out_unlock;
                        }
                }
-               rcu_read_unlock_sched();
+               rcu_read_unlock();
        }
 out_unlock:
        mutex_unlock(&wq_pool_mutex);
@@ -4930,7 +4970,8 @@ static ssize_t wq_pool_ids_show(struct device *dev,
        const char *delim = "";
        int node, written = 0;
 
-       rcu_read_lock_sched();
+       get_online_cpus();
+       rcu_read_lock();
        for_each_node(node) {
                written += scnprintf(buf + written, PAGE_SIZE - written,
                                     "%s%d:%d", delim, node,
@@ -4938,7 +4979,8 @@ static ssize_t wq_pool_ids_show(struct device *dev,
                delim = " ";
        }
        written += scnprintf(buf + written, PAGE_SIZE - written, "\n");
-       rcu_read_unlock_sched();
+       rcu_read_unlock();
+       put_online_cpus();
 
        return written;
 }
diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h
index 3fa9c146fccb..42d1e3974554 100644
--- a/kernel/workqueue_internal.h
+++ b/kernel/workqueue_internal.h
@@ -44,6 +44,7 @@ struct worker {
        unsigned long           last_active;    /* L: last active timestamp */
        unsigned int            flags;          /* X: flags */
        int                     id;             /* I: worker id */
+       int                     sleeping;       /* None */
 
        /*
         * Opaque string set with work_set_desc().  Printed out with task
@@ -69,7 +70,7 @@ static inline struct worker *current_wq_worker(void)
  * Scheduler hooks for concurrency managed workqueue.  Only to be used from
  * sched/core.c and workqueue.c.
  */
-void wq_worker_waking_up(struct task_struct *task, int cpu);
-struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu);
+void wq_worker_running(struct task_struct *task);
+void wq_worker_sleeping(struct task_struct *task);
 
 #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */
diff --git a/lib/Kconfig b/lib/Kconfig
index 1a48744253d7..f75de578cca8 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -397,6 +397,7 @@ config CHECK_SIGNATURE
 
 config CPUMASK_OFFSTACK
        bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
+       depends on !PREEMPT_RT_FULL
        help
          Use dynamic allocation for cpumask_var_t, instead of putting
          them on the stack.  This is a bit more expensive, but avoids
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index 547f7f923dbc..8fcdbc2fc6d0 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -309,7 +309,10 @@ __debug_object_init(void *addr, struct debug_obj_descr *descr, int onstack)
        struct debug_obj *obj;
        unsigned long flags;
 
-       fill_pool();
+#ifdef CONFIG_PREEMPT_RT_FULL
+       if (preempt_count() == 0 && !irqs_disabled())
+#endif
+               fill_pool();
 
        db = get_bucket((unsigned long) addr);
 
diff --git a/lib/idr.c b/lib/idr.c
index 6098336df267..9decbe914595 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -30,6 +30,7 @@
 #include <linux/idr.h>
 #include <linux/spinlock.h>
 #include <linux/percpu.h>
+#include <linux/locallock.h>
 
 #define MAX_IDR_SHIFT          (sizeof(int) * 8 - 1)
 #define MAX_IDR_BIT            (1U << MAX_IDR_SHIFT)
@@ -45,6 +46,37 @@ static DEFINE_PER_CPU(struct idr_layer *, idr_preload_head);
 static DEFINE_PER_CPU(int, idr_preload_cnt);
 static DEFINE_SPINLOCK(simple_ida_lock);
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+static DEFINE_LOCAL_IRQ_LOCK(idr_lock);
+
+static inline void idr_preload_lock(void)
+{
+       local_lock(idr_lock);
+}
+
+static inline void idr_preload_unlock(void)
+{
+       local_unlock(idr_lock);
+}
+
+void idr_preload_end(void)
+{
+       idr_preload_unlock();
+}
+EXPORT_SYMBOL(idr_preload_end);
+#else
+static inline void idr_preload_lock(void)
+{
+       preempt_disable();
+}
+
+static inline void idr_preload_unlock(void)
+{
+       preempt_enable();
+}
+#endif
+
+
 /* the maximum ID which can be allocated given idr->layers */
 static int idr_max(int layers)
 {
@@ -115,14 +147,14 @@ static struct idr_layer *idr_layer_alloc(gfp_t gfp_mask, struct idr *layer_idr)
         * context.  See idr_preload() for details.
         */
        if (!in_interrupt()) {
-               preempt_disable();
+               idr_preload_lock();
                new = __this_cpu_read(idr_preload_head);
                if (new) {
                        __this_cpu_write(idr_preload_head, new->ary[0]);
                        __this_cpu_dec(idr_preload_cnt);
                        new->ary[0] = NULL;
                }
-               preempt_enable();
+               idr_preload_unlock();
                if (new)
                        return new;
        }
@@ -366,7 +398,6 @@ static void idr_fill_slot(struct idr *idr, void *ptr, int id,
        idr_mark_full(pa, id);
 }
 
-
 /**
  * idr_preload - preload for idr_alloc()
  * @gfp_mask: allocation mask to use for preloading
@@ -401,7 +432,7 @@ void idr_preload(gfp_t gfp_mask)
        WARN_ON_ONCE(in_interrupt());
        might_sleep_if(gfpflags_allow_blocking(gfp_mask));
 
-       preempt_disable();
+       idr_preload_lock();
 
        /*
         * idr_alloc() is likely to succeed w/o full idr_layer buffer and
@@ -413,9 +444,9 @@ void idr_preload(gfp_t gfp_mask)
        while (__this_cpu_read(idr_preload_cnt) < MAX_IDR_FREE) {
                struct idr_layer *new;
 
-               preempt_enable();
+               idr_preload_unlock();
                new = kmem_cache_zalloc(idr_layer_cache, gfp_mask);
-               preempt_disable();
+               idr_preload_lock();
                if (!new)
                        break;
 
diff --git a/lib/locking-selftest.c b/lib/locking-selftest.c
index 872a15a2a637..b93a6103fa4d 100644
--- a/lib/locking-selftest.c
+++ b/lib/locking-selftest.c
@@ -590,6 +590,8 @@ GENERATE_TESTCASE(init_held_rsem)
 #include "locking-selftest-spin-hardirq.h"
 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
 
+#ifndef CONFIG_PREEMPT_RT_FULL
+
 #include "locking-selftest-rlock-hardirq.h"
 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
 
@@ -605,9 +607,12 @@ GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock)
 #include "locking-selftest-wlock-softirq.h"
 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock)
 
+#endif
+
 #undef E1
 #undef E2
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 /*
  * Enabling hardirqs with a softirq-safe lock held:
  */
@@ -640,6 +645,8 @@ GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock)
 #undef E1
 #undef E2
 
+#endif
+
 /*
  * Enabling irqs with an irq-safe lock held:
  */
@@ -663,6 +670,8 @@ GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock)
 #include "locking-selftest-spin-hardirq.h"
 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin)
 
+#ifndef CONFIG_PREEMPT_RT_FULL
+
 #include "locking-selftest-rlock-hardirq.h"
 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock)
 
@@ -678,6 +687,8 @@ GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock)
 #include "locking-selftest-wlock-softirq.h"
 GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
 
+#endif
+
 #undef E1
 #undef E2
 
@@ -709,6 +720,8 @@ GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
 #include "locking-selftest-spin-hardirq.h"
 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin)
 
+#ifndef CONFIG_PREEMPT_RT_FULL
+
 #include "locking-selftest-rlock-hardirq.h"
 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock)
 
@@ -724,6 +737,8 @@ GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock)
 #include "locking-selftest-wlock-softirq.h"
 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
 
+#endif
+
 #undef E1
 #undef E2
 #undef E3
@@ -757,6 +772,8 @@ GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
 #include "locking-selftest-spin-hardirq.h"
 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin)
 
+#ifndef CONFIG_PREEMPT_RT_FULL
+
 #include "locking-selftest-rlock-hardirq.h"
 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock)
 
@@ -772,10 +789,14 @@ GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock)
 #include "locking-selftest-wlock-softirq.h"
 GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock)
 
+#endif
+
 #undef E1
 #undef E2
 #undef E3
 
+#ifndef CONFIG_PREEMPT_RT_FULL
+
 /*
  * read-lock / write-lock irq inversion.
  *
@@ -838,6 +859,10 @@ GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock)
 #undef E2
 #undef E3
 
+#endif
+
+#ifndef CONFIG_PREEMPT_RT_FULL
+
 /*
  * read-lock / write-lock recursion that is actually safe.
  */
@@ -876,6 +901,8 @@ GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft)
 #undef E2
 #undef E3
 
+#endif
+
 /*
  * read-lock / write-lock recursion that is unsafe.
  */
@@ -1858,6 +1885,7 @@ void locking_selftest(void)
 
        printk("  --------------------------------------------------------------------------\n");
 
+#ifndef CONFIG_PREEMPT_RT_FULL
        /*
         * irq-context testcases:
         */
@@ -1870,6 +1898,28 @@ void locking_selftest(void)
 
        DO_TESTCASE_6x2("irq read-recursion", irq_read_recursion);
 //     DO_TESTCASE_6x2B("irq read-recursion #2", irq_read_recursion2);
+#else
+       /* On -rt, we only do hardirq context test for raw spinlock */
+       DO_TESTCASE_1B("hard-irqs-on + irq-safe-A", irqsafe1_hard_spin, 12);
+       DO_TESTCASE_1B("hard-irqs-on + irq-safe-A", irqsafe1_hard_spin, 21);
+
+       DO_TESTCASE_1B("hard-safe-A + irqs-on", irqsafe2B_hard_spin, 12);
+       DO_TESTCASE_1B("hard-safe-A + irqs-on", irqsafe2B_hard_spin, 21);
+
+       DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 123);
+       DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 132);
+       DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 213);
+       DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 231);
+       DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 312);
+       DO_TESTCASE_1B("hard-safe-A + unsafe-B #1", irqsafe3_hard_spin, 321);
+
+       DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 123);
+       DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 132);
+       DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 213);
+       DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 231);
+       DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 312);
+       DO_TESTCASE_1B("hard-safe-A + unsafe-B #2", irqsafe4_hard_spin, 321);
+#endif
 
        ww_tests();
 
diff --git a/lib/percpu_ida.c b/lib/percpu_ida.c
index 6d40944960de..822a2c027e72 100644
--- a/lib/percpu_ida.c
+++ b/lib/percpu_ida.c
@@ -26,6 +26,9 @@
 #include <linux/string.h>
 #include <linux/spinlock.h>
 #include <linux/percpu_ida.h>
+#include <linux/locallock.h>
+
+static DEFINE_LOCAL_IRQ_LOCK(irq_off_lock);
 
 struct percpu_ida_cpu {
        /*
@@ -148,13 +151,13 @@ int percpu_ida_alloc(struct percpu_ida *pool, int state)
        unsigned long flags;
        int tag;
 
-       local_irq_save(flags);
+       local_lock_irqsave(irq_off_lock, flags);
        tags = this_cpu_ptr(pool->tag_cpu);
 
        /* Fastpath */
        tag = alloc_local_tag(tags);
        if (likely(tag >= 0)) {
-               local_irq_restore(flags);
+               local_unlock_irqrestore(irq_off_lock, flags);
                return tag;
        }
 
@@ -173,6 +176,7 @@ int percpu_ida_alloc(struct percpu_ida *pool, int state)
 
                if (!tags->nr_free)
                        alloc_global_tags(pool, tags);
+
                if (!tags->nr_free)
                        steal_tags(pool, tags);
 
@@ -184,7 +188,7 @@ int percpu_ida_alloc(struct percpu_ida *pool, int state)
                }
 
                spin_unlock(&pool->lock);
-               local_irq_restore(flags);
+               local_unlock_irqrestore(irq_off_lock, flags);
 
                if (tag >= 0 || state == TASK_RUNNING)
                        break;
@@ -196,7 +200,7 @@ int percpu_ida_alloc(struct percpu_ida *pool, int state)
 
                schedule();
 
-               local_irq_save(flags);
+               local_lock_irqsave(irq_off_lock, flags);
                tags = this_cpu_ptr(pool->tag_cpu);
        }
        if (state != TASK_RUNNING)
@@ -221,7 +225,7 @@ void percpu_ida_free(struct percpu_ida *pool, unsigned tag)
 
        BUG_ON(tag >= pool->nr_tags);
 
-       local_irq_save(flags);
+       local_lock_irqsave(irq_off_lock, flags);
        tags = this_cpu_ptr(pool->tag_cpu);
 
        spin_lock(&tags->lock);
@@ -253,7 +257,7 @@ void percpu_ida_free(struct percpu_ida *pool, unsigned tag)
                spin_unlock(&pool->lock);
        }
 
-       local_irq_restore(flags);
+       local_unlock_irqrestore(irq_off_lock, flags);
 }
 EXPORT_SYMBOL_GPL(percpu_ida_free);
 
@@ -345,7 +349,7 @@ int percpu_ida_for_each_free(struct percpu_ida *pool, percpu_ida_cb fn,
        struct percpu_ida_cpu *remote;
        unsigned cpu, i, err = 0;
 
-       local_irq_save(flags);
+       local_lock_irqsave(irq_off_lock, flags);
        for_each_possible_cpu(cpu) {
                remote = per_cpu_ptr(pool->tag_cpu, cpu);
                spin_lock(&remote->lock);
@@ -367,7 +371,7 @@ int percpu_ida_for_each_free(struct percpu_ida *pool, percpu_ida_cb fn,
        }
        spin_unlock(&pool->lock);
 out:
-       local_irq_restore(flags);
+       local_unlock_irqrestore(irq_off_lock, flags);
        return err;
 }
 EXPORT_SYMBOL_GPL(percpu_ida_for_each_free);
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 6b79e9026e24..44bf36a396a9 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -34,7 +34,7 @@
 #include <linux/bitops.h>
 #include <linux/rcupdate.h>
 #include <linux/preempt.h>             /* in_interrupt() */
-
+#include <linux/locallock.h>
 
 /*
  * The height_to_maxindex array needs to be one deeper than the maximum
@@ -69,6 +69,7 @@ struct radix_tree_preload {
        struct radix_tree_node *nodes;
 };
 static DEFINE_PER_CPU(struct radix_tree_preload, radix_tree_preloads) = { 0, };
+static DEFINE_LOCAL_IRQ_LOCK(radix_tree_preloads_lock);
 
 static inline void *ptr_to_indirect(void *ptr)
 {
@@ -196,13 +197,14 @@ radix_tree_node_alloc(struct radix_tree_root *root)
                 * succeed in getting a node here (and never reach
                 * kmem_cache_alloc)
                 */
-               rtp = this_cpu_ptr(&radix_tree_preloads);
+               rtp = &get_locked_var(radix_tree_preloads_lock, radix_tree_preloads);
                if (rtp->nr) {
                        ret = rtp->nodes;
                        rtp->nodes = ret->private_data;
                        ret->private_data = NULL;
                        rtp->nr--;
                }
+               put_locked_var(radix_tree_preloads_lock, radix_tree_preloads);
                /*
                 * Update the allocation stack trace as this is more useful
                 * for debugging.
@@ -257,14 +259,14 @@ static int __radix_tree_preload(gfp_t gfp_mask)
        struct radix_tree_node *node;
        int ret = -ENOMEM;
 
-       preempt_disable();
+       local_lock(radix_tree_preloads_lock);
        rtp = this_cpu_ptr(&radix_tree_preloads);
        while (rtp->nr < RADIX_TREE_PRELOAD_SIZE) {
-               preempt_enable();
+               local_unlock(radix_tree_preloads_lock);
                node = kmem_cache_alloc(radix_tree_node_cachep, gfp_mask);
                if (node == NULL)
                        goto out;
-               preempt_disable();
+               local_lock(radix_tree_preloads_lock);
                rtp = this_cpu_ptr(&radix_tree_preloads);
                if (rtp->nr < RADIX_TREE_PRELOAD_SIZE) {
                        node->private_data = rtp->nodes;
@@ -306,11 +308,17 @@ int radix_tree_maybe_preload(gfp_t gfp_mask)
        if (gfpflags_allow_blocking(gfp_mask))
                return __radix_tree_preload(gfp_mask);
        /* Preloading doesn't help anything with this gfp mask, skip it */
-       preempt_disable();
+       local_lock(radix_tree_preloads_lock);
        return 0;
 }
 EXPORT_SYMBOL(radix_tree_maybe_preload);
 
+void radix_tree_preload_end(void)
+{
+       local_unlock(radix_tree_preloads_lock);
+}
+EXPORT_SYMBOL(radix_tree_preload_end);
+
 /*
  *     Return the maximum key which can be store into a
  *     radix tree with height HEIGHT.
diff --git a/lib/rbtree.c b/lib/rbtree.c
index 1356454e36de..d15d6c4327f1 100644
--- a/lib/rbtree.c
+++ b/lib/rbtree.c
@@ -23,6 +23,7 @@
 
 #include <linux/rbtree_augmented.h>
 #include <linux/export.h>
+#include <linux/rcupdate.h>
 
 /*
  * red-black trees properties:  http://en.wikipedia.org/wiki/Rbtree
@@ -590,3 +591,13 @@ struct rb_node *rb_first_postorder(const struct rb_root *root)
        return rb_left_deepest_node(root->rb_node);
 }
 EXPORT_SYMBOL(rb_first_postorder);
+
+void rb_link_node_rcu(struct rb_node *node, struct rb_node *parent,
+                                   struct rb_node **rb_link)
+{
+       node->__rb_parent_color = (unsigned long)parent;
+       node->rb_left = node->rb_right = NULL;
+
+       rcu_assign_pointer(*rb_link, node);
+}
+EXPORT_SYMBOL(rb_link_node_rcu);
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index bafa9933fa76..ebe3b7edd086 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -620,7 +620,7 @@ void sg_miter_stop(struct sg_mapping_iter *miter)
                        flush_kernel_dcache_page(miter->page);
 
                if (miter->__flags & SG_MITER_ATOMIC) {
-                       WARN_ON_ONCE(preemptible());
+                       WARN_ON_ONCE(!pagefault_disabled());
                        kunmap_atomic(miter->addr);
                } else
                        kunmap(miter->page);
@@ -664,7 +664,7 @@ size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf,
        if (!sg_miter_skip(&miter, skip))
                return false;
 
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
 
        while (sg_miter_next(&miter) && offset < buflen) {
                unsigned int len;
@@ -681,7 +681,7 @@ size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf,
 
        sg_miter_stop(&miter);
 
-       local_irq_restore(flags);
+       local_irq_restore_nort(flags);
        return offset;
 }
 EXPORT_SYMBOL(sg_copy_buffer);
diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c
index 1afec32de6f2..11fa431046a8 100644
--- a/lib/smp_processor_id.c
+++ b/lib/smp_processor_id.c
@@ -39,8 +39,9 @@ notrace static unsigned int check_preemption_disabled(const char *what1,
        if (!printk_ratelimit())
                goto out_enable;
 
-       printk(KERN_ERR "BUG: using %s%s() in preemptible [%08x] code: %s/%d\n",
-               what1, what2, preempt_count() - 1, current->comm, current->pid);
+       printk(KERN_ERR "BUG: using %s%s() in preemptible [%08x %08x] code: %s/%d\n",
+               what1, what2, preempt_count() - 1, __migrate_disabled(current),
+               current->comm, current->pid);
 
        print_symbol("caller is %s\n", (long)__builtin_return_address(0));
        dump_stack();
diff --git a/mm/Kconfig b/mm/Kconfig
index 97a4e06b15c0..9614351e68b8 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -392,7 +392,7 @@ config NOMMU_INITIAL_TRIM_EXCESS
 
 config TRANSPARENT_HUGEPAGE
        bool "Transparent Hugepage Support"
-       depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE
+       depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE && !PREEMPT_RT_FULL
        select COMPACTION
        help
          Transparent Hugepages allows the kernel to use huge pages and
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index a988d4ef39da..f2c2ee1d5191 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -457,9 +457,9 @@ void wb_congested_put(struct bdi_writeback_congested *congested)
 {
        unsigned long flags;
 
-       local_irq_save(flags);
+       local_irq_save_nort(flags);
        if (!atomic_dec_and_lock(&congested->refcnt, &cgwb_lock)) {
-               local_irq_restore(flags);
+               local_irq_restore_nort(flags);
                return;
        }
 
diff --git a/mm/compaction.c b/mm/compaction.c
index b6f145ed7ae1..03cac7f6768a 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1450,10 +1450,12 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
                                cc->migrate_pfn & ~((1UL << cc->order) - 1);
 
                        if (cc->last_migrated_pfn < current_block_start) {
-                               cpu = get_cpu();
+                               cpu = get_cpu_light();
+                               local_lock_irq(swapvec_lock);
                                lru_add_drain_cpu(cpu);
+                               local_unlock_irq(swapvec_lock);
                                drain_local_pages(zone);
-                               put_cpu();
+                               put_cpu_light();
                                /* No more flushing until we migrate again */
                                cc->last_migrated_pfn = 0;
                        }
diff --git a/mm/filemap.c b/mm/filemap.c
index 69f75c77c098..b203169ca0b4 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -144,9 +144,12 @@ static int page_cache_tree_insert(struct address_space *mapping,
                 * node->private_list is protected by
                 * mapping->tree_lock.
                 */
-               if (!list_empty(&node->private_list))
-                       list_lru_del(&workingset_shadow_nodes,
+               if (!list_empty(&node->private_list)) {
+                       local_lock(workingset_shadow_lock);
+                       list_lru_del(&__workingset_shadow_nodes,
                                     &node->private_list);
+                       local_unlock(workingset_shadow_lock);
+               }
        }
        return 0;
 }
@@ -218,7 +221,9 @@ static void page_cache_tree_delete(struct address_space *mapping,
        if (!workingset_node_pages(node) &&
            list_empty(&node->private_list)) {
                node->private_data = mapping;
-               list_lru_add(&workingset_shadow_nodes, &node->private_list);
+               local_lock(workingset_shadow_lock);
+               list_lru_add(&__workingset_shadow_nodes, &node->private_list);
+               local_unlock(workingset_shadow_lock);
        }
 }
 
diff --git a/mm/highmem.c b/mm/highmem.c
index 123bcd3ed4f2..16e8cf26d38a 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -29,10 +29,11 @@
 #include <linux/kgdb.h>
 #include <asm/tlbflush.h>
 
-
+#ifndef CONFIG_PREEMPT_RT_FULL
 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_X86_32)
 DEFINE_PER_CPU(int, __kmap_atomic_idx);
 #endif
+#endif
 
 /*
  * Virtual_count is not a pure "count".
@@ -107,8 +108,9 @@ static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color)
 unsigned long totalhigh_pages __read_mostly;
 EXPORT_SYMBOL(totalhigh_pages);
 
-
+#ifndef CONFIG_PREEMPT_RT_FULL
 EXPORT_PER_CPU_SYMBOL(__kmap_atomic_idx);
+#endif
 
 unsigned int nr_free_highpages (void)
 {
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e25b93a4267d..1c619267d9da 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -67,6 +67,8 @@
 #include <net/sock.h>
 #include <net/ip.h>
 #include <net/tcp_memcontrol.h>
+#include <linux/locallock.h>
+
 #include "slab.h"
 
 #include <asm/uaccess.h>
@@ -87,6 +89,7 @@ int do_swap_account __read_mostly;
 #define do_swap_account                0
 #endif
 
+static DEFINE_LOCAL_IRQ_LOCK(event_lock);
 static const char * const mem_cgroup_stat_names[] = {
        "cache",
        "rss",
@@ -1922,14 +1925,17 @@ static void drain_local_stock(struct work_struct *dummy)
  */
 static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages)
 {
-       struct memcg_stock_pcp *stock = &get_cpu_var(memcg_stock);
+       struct memcg_stock_pcp *stock;
+       int cpu = get_cpu_light();
+
+       stock = &per_cpu(memcg_stock, cpu);
 
        if (stock->cached != memcg) { /* reset if necessary */
                drain_stock(stock);
                stock->cached = memcg;
        }
        stock->nr_pages += nr_pages;
-       put_cpu_var(memcg_stock);
+       put_cpu_light();
 }
 
 /*
@@ -1945,7 +1951,7 @@ static void drain_all_stock(struct mem_cgroup *root_memcg)
                return;
        /* Notify other cpus that system-wide "drain" is running */
        get_online_cpus();
-       curcpu = get_cpu();
+       curcpu = get_cpu_light();
        for_each_online_cpu(cpu) {
                struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu);
                struct mem_cgroup *memcg;
@@ -1962,7 +1968,7 @@ static void drain_all_stock(struct mem_cgroup *root_memcg)
                                schedule_work_on(cpu, &stock->work);
                }
        }
-       put_cpu();
+       put_cpu_light();
        put_online_cpus();
        mutex_unlock(&percpu_charge_mutex);
 }
@@ -4691,12 +4697,12 @@ static int mem_cgroup_move_account(struct page *page,
 
        ret = 0;
 
-       local_irq_disable();
+       local_lock_irq(event_lock);
        mem_cgroup_charge_statistics(to, page, nr_pages);
        memcg_check_events(to, page);
        mem_cgroup_charge_statistics(from, page, -nr_pages);
        memcg_check_events(from, page);
-       local_irq_enable();
+       local_unlock_irq(event_lock);
 out_unlock:
        unlock_page(page);
 out:
@@ -5486,10 +5492,10 @@ void mem_cgroup_commit_charge(struct page *page, struct mem_cgroup *memcg,
                VM_BUG_ON_PAGE(!PageTransHuge(page), page);
        }
 
-       local_irq_disable();
+       local_lock_irq(event_lock);
        mem_cgroup_charge_statistics(memcg, page, nr_pages);
        memcg_check_events(memcg, page);
-       local_irq_enable();
+       local_unlock_irq(event_lock);
 
        if (do_swap_account && PageSwapCache(page)) {
                swp_entry_t entry = { .val = page_private(page) };
@@ -5545,14 +5551,14 @@ static void uncharge_batch(struct mem_cgroup *memcg, unsigned long pgpgout,
                memcg_oom_recover(memcg);
        }
 
-       local_irq_save(flags);
+       local_lock_irqsave(event_lock, flags);
        __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS], nr_anon);
        __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_CACHE], nr_file);
        __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS_HUGE], nr_huge);
        __this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGPGOUT], pgpgout);
        __this_cpu_add(memcg->stat->nr_page_events, nr_pages);
        memcg_check_events(memcg, dummy_page);
-       local_irq_restore(flags);
+       local_unlock_irqrestore(event_lock, flags);
 
        if (!mem_cgroup_is_root(memcg))
                css_put_many(&memcg->css, nr_pages);
@@ -5762,6 +5768,7 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
 {
        struct mem_cgroup *memcg, *swap_memcg;
        unsigned short oldid;
+       unsigned long flags;
 
        VM_BUG_ON_PAGE(PageLRU(page), page);
        VM_BUG_ON_PAGE(page_count(page), page);
@@ -5802,12 +5809,16 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
         * important here to have the interrupts disabled because it is the
         * only synchronisation we have for udpating the per-CPU variables.
         */
+       local_lock_irqsave(event_lock, flags);
+#ifndef CONFIG_PREEMPT_RT_BASE
        VM_BUG_ON(!irqs_disabled());
+#endif
        mem_cgroup_charge_statistics(memcg, page, -1);
        memcg_check_events(memcg, page);
 
        if (!mem_cgroup_is_root(memcg))
                css_put(&memcg->css);
+       local_unlock_irqrestore(event_lock, flags);
 }
 
 /**
diff --git a/mm/mmu_context.c b/mm/mmu_context.c
index 6f4d27c5bb32..5cd25c745a8f 100644
--- a/mm/mmu_context.c
+++ b/mm/mmu_context.c
@@ -23,6 +23,7 @@ void use_mm(struct mm_struct *mm)
        struct task_struct *tsk = current;
 
        task_lock(tsk);
+       preempt_disable_rt();
        active_mm = tsk->active_mm;
        if (active_mm != mm) {
                atomic_inc(&mm->mm_count);
@@ -30,6 +31,7 @@ void use_mm(struct mm_struct *mm)
        }
        tsk->mm = mm;
        switch_mm(active_mm, mm, tsk);
+       preempt_enable_rt();
        task_unlock(tsk);
 #ifdef finish_arch_post_lock_switch
        finish_arch_post_lock_switch();
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3c70f03d91ec..e1377f157652 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -60,6 +60,7 @@
 #include <linux/page_ext.h>
 #include <linux/hugetlb.h>
 #include <linux/sched/rt.h>
+#include <linux/locallock.h>
 #include <linux/page_owner.h>
 #include <linux/kthread.h>
 
@@ -264,6 +265,18 @@ EXPORT_SYMBOL(nr_node_ids);
 EXPORT_SYMBOL(nr_online_nodes);
 #endif
 
+static DEFINE_LOCAL_IRQ_LOCK(pa_lock);
+
+#ifdef CONFIG_PREEMPT_RT_BASE
+# define cpu_lock_irqsave(cpu, flags)          \
+       local_lock_irqsave_on(pa_lock, flags, cpu)
+# define cpu_unlock_irqrestore(cpu, flags)     \
+       local_unlock_irqrestore_on(pa_lock, flags, cpu)
+#else
+# define cpu_lock_irqsave(cpu, flags)          local_irq_save(flags)
+# define cpu_unlock_irqrestore(cpu, flags)     local_irq_restore(flags)
+#endif
+
 int page_group_by_mobility_disabled __read_mostly;
 
 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
@@ -820,7 +833,7 @@ static inline int free_pages_check(struct page *page)
 }
 
 /*
- * Frees a number of pages from the PCP lists
+ * Frees a number of pages which have been collected from the pcp lists.
  * Assumes all pages on list are in same zone, and of same order.
  * count is the number of pages to free.
  *
@@ -831,18 +844,53 @@ static inline int free_pages_check(struct page *page)
  * pinned" detection logic.
  */
 static void free_pcppages_bulk(struct zone *zone, int count,
-                                       struct per_cpu_pages *pcp)
+                              struct list_head *list)
 {
-       int migratetype = 0;
-       int batch_free = 0;
        int to_free = count;
        unsigned long nr_scanned;
+       unsigned long flags;
+
+       spin_lock_irqsave(&zone->lock, flags);
 
-       spin_lock(&zone->lock);
        nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED);
        if (nr_scanned)
                __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
 
+       while (!list_empty(list)) {
+               struct page *page = list_first_entry(list, struct page, lru);
+               int mt; /* migratetype of the to-be-freed page */
+
+               /* must delete as __free_one_page list manipulates */
+               list_del(&page->lru);
+
+               mt = get_pcppage_migratetype(page);
+               /* MIGRATE_ISOLATE page should not go to pcplists */
+               VM_BUG_ON_PAGE(is_migrate_isolate(mt), page);
+               /* Pageblock could have been isolated meanwhile */
+               if (unlikely(has_isolate_pageblock(zone)))
+                       mt = get_pageblock_migratetype(page);
+
+               __free_one_page(page, page_to_pfn(page), zone, 0, mt);
+               trace_mm_page_pcpu_drain(page, 0, mt);
+               to_free--;
+       }
+       WARN_ON(to_free != 0);
+       spin_unlock_irqrestore(&zone->lock, flags);
+}
+
+/*
+ * Moves a number of pages from the PCP lists to free list which
+ * is freed outside of the locked region.
+ *
+ * Assumes all pages on list are in same zone, and of same order.
+ * count is the number of pages to free.
+ */
+static void isolate_pcp_pages(int to_free, struct per_cpu_pages *src,
+                             struct list_head *dst)
+{
+       int migratetype = 0;
+       int batch_free = 0;
+
        while (to_free) {
                struct page *page;
                struct list_head *list;
@@ -858,7 +906,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
                        batch_free++;
                        if (++migratetype == MIGRATE_PCPTYPES)
                                migratetype = 0;
-                       list = &pcp->lists[migratetype];
+                       list = &src->lists[migratetype];
                } while (list_empty(list));
 
                /* This is the only non-empty list. Free them all. */
@@ -866,24 +914,12 @@ static void free_pcppages_bulk(struct zone *zone, int count,
                        batch_free = to_free;
 
                do {
-                       int mt; /* migratetype of the to-be-freed page */
-
-                       page = list_entry(list->prev, struct page, lru);
-                       /* must delete as __free_one_page list manipulates */
+                       page = list_last_entry(list, struct page, lru);
                        list_del(&page->lru);
 
-                       mt = get_pcppage_migratetype(page);
-                       /* MIGRATE_ISOLATE page should not go to pcplists */
-                       VM_BUG_ON_PAGE(is_migrate_isolate(mt), page);
-                       /* Pageblock could have been isolated meanwhile */
-                       if (unlikely(has_isolate_pageblock(zone)))
-                               mt = get_pageblock_migratetype(page);
-
-                       __free_one_page(page, page_to_pfn(page), zone, 0, mt);
-                       trace_mm_page_pcpu_drain(page, 0, mt);
+                       list_add(&page->lru, dst);
                } while (--to_free && --batch_free && !list_empty(list));
        }
-       spin_unlock(&zone->lock);
 }
 
 static void free_one_page(struct zone *zone,
@@ -892,7 +928,9 @@ static void free_one_page(struct zone *zone,
                                int migratetype)
 {
        unsigned long nr_scanned;
-       spin_lock(&zone->lock);
+       unsigned long flags;
+
+       spin_lock_irqsave(&zone->lock, flags);
        nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED);
        if (nr_scanned)
                __mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
@@ -902,7 +940,7 @@ static void free_one_page(struct zone *zone,
                migratetype = get_pfnblock_migratetype(page, pfn);
        }
        __free_one_page(page, pfn, zone, order, migratetype);
-       spin_unlock(&zone->lock);
+       spin_unlock_irqrestore(&zone->lock, flags);
 }
 
 static int free_tail_pages_check(struct page *head_page, struct page *page)
@@ -1053,10 +1091,10 @@ static void __free_pages_ok(struct page *page, unsigned int order)
                return;
 
        migratetype = get_pfnblock_migratetype(page, pfn);
-       local_irq_save(flags);
+       local_lock_irqsave(pa_lock, flags);
        __count_vm_events(PGFREE, 1 << order);
        free_one_page(page_zone(page), page, pfn, order, migratetype);
-       local_irq_restore(flags);
+       local_unlock_irqrestore(pa_lock, flags);
 }
 
 static void __init __free_pages_boot_core(struct page *page,
@@ -1925,16 +1963,18 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp)
 {
        unsigned long flags;
+       LIST_HEAD(dst);
        int to_drain, batch;
 
-       local_irq_save(flags);
+       local_lock_irqsave(pa_lock, flags);
        batch = READ_ONCE(pcp->batch);
        to_drain = min(pcp->count, batch);
        if (to_drain > 0) {
-               free_pcppages_bulk(zone, to_drain, pcp);
+               isolate_pcp_pages(to_drain, pcp, &dst);
                pcp->count -= to_drain;
        }
-       local_irq_restore(flags);
+       local_unlock_irqrestore(pa_lock, flags);
+       free_pcppages_bulk(zone, to_drain, &dst);
 }
 #endif
 
@@ -1950,16 +1990,21 @@ static void drain_pages_zone(unsigned int cpu, struct zone *zone)
        unsigned long flags;
        struct per_cpu_pageset *pset;
        struct per_cpu_pages *pcp;
+       LIST_HEAD(dst);
+       int count;
 
-       local_irq_save(flags);
+       cpu_lock_irqsave(cpu, flags);
        pset = per_cpu_ptr(zone->pageset, cpu);
 
        pcp = &pset->pcp;
-       if (pcp->count) {
-               free_pcppages_bulk(zone, pcp->count, pcp);
+       count = pcp->count;
+       if (count) {
+               isolate_pcp_pages(count, pcp, &dst);
                pcp->count = 0;
        }
-       local_irq_restore(flags);
+       cpu_unlock_irqrestore(cpu, flags);
+       if (count)
+               free_pcppages_bulk(zone, count, &dst);
 }
 
 /*
@@ -2045,8 +2090,17 @@ void drain_all_pages(struct zone *zone)
                else
                        cpumask_clear_cpu(cpu, &cpus_with_pcps);
        }
+#ifndef CONFIG_PREEMPT_RT_BASE
        on_each_cpu_mask(&cpus_with_pcps, (smp_call_func_t) drain_local_pages,
                                                                zone, 1);
+#else
+       for_each_cpu(cpu, &cpus_with_pcps) {
+               if (zone)
+                       drain_pages_zone(cpu, zone);
+               else
+                       drain_pages(cpu);
+       }
+#endif
 }
 
 #ifdef CONFIG_HIBERNATION
@@ -2102,7 +2156,7 @@ void free_hot_cold_page(struct page *page, bool cold)
 
        migratetype = get_pfnblock_migratetype(page, pfn);
        set_pcppage_migratetype(page, migratetype);
-       local_irq_save(flags);
+       local_lock_irqsave(pa_lock, flags);
        __count_vm_event(PGFREE);
 
        /*
@@ -2128,12 +2182,17 @@ void free_hot_cold_page(struct page *page, bool cold)
        pcp->count++;
        if (pcp->count >= pcp->high) {
                unsigned long batch = READ_ONCE(pcp->batch);
-               free_pcppages_bulk(zone, batch, pcp);
+               LIST_HEAD(dst);
+
+               isolate_pcp_pages(batch, pcp, &dst);
                pcp->count -= batch;
+               local_unlock_irqrestore(pa_lock, flags);
+               free_pcppages_bulk(zone, batch, &dst);
+               return;
        }
 
 out:
-       local_irq_restore(flags);
+       local_unlock_irqrestore(pa_lock, flags);
 }
 
 /*
@@ -2268,7 +2327,7 @@ struct page *buffered_rmqueue(struct zone *preferred_zone,
                struct per_cpu_pages *pcp;
                struct list_head *list;
 
-               local_irq_save(flags);
+               local_lock_irqsave(pa_lock, flags);
                pcp = &this_cpu_ptr(zone->pageset)->pcp;
                list = &pcp->lists[migratetype];
                if (list_empty(list)) {
@@ -2300,7 +2359,7 @@ struct page *buffered_rmqueue(struct zone *preferred_zone,
                         */
                        WARN_ON_ONCE(order > 1);
                }
-               spin_lock_irqsave(&zone->lock, flags);
+               local_spin_lock_irqsave(pa_lock, &zone->lock, flags);
 
                page = NULL;
                if (alloc_flags & ALLOC_HARDER) {
@@ -2310,11 +2369,13 @@ struct page *buffered_rmqueue(struct zone *preferred_zone,
                }
                if (!page)
                        page = __rmqueue(zone, order, migratetype, gfp_flags);
-               spin_unlock(&zone->lock);
-               if (!page)
+               if (!page) {
+                       spin_unlock(&zone->lock);
                        goto failed;
+               }
                __mod_zone_freepage_state(zone, -(1 << order),
                                          get_pcppage_migratetype(page));
+               spin_unlock(&zone->lock);
        }
 
        __mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order));
@@ -2324,13 +2385,13 @@ struct page *buffered_rmqueue(struct zone *preferred_zone,
 
        __count_zone_vm_events(PGALLOC, zone, 1 << order);
        zone_statistics(preferred_zone, zone, gfp_flags);
-       local_irq_restore(flags);
+       local_unlock_irqrestore(pa_lock, flags);
 
        VM_BUG_ON_PAGE(bad_range(zone, page), page);
        return page;
 
 failed:
-       local_irq_restore(flags);
+       local_unlock_irqrestore(pa_lock, flags);
        return NULL;
 }
 
@@ -5999,6 +6060,7 @@ static int page_alloc_cpu_notify(struct notifier_block *self,
 void __init page_alloc_init(void)
 {
        hotcpu_notifier(page_alloc_cpu_notify, 0);
+       local_irq_lock_init(pa_lock);
 }
 
 /*
@@ -6893,7 +6955,7 @@ void zone_pcp_reset(struct zone *zone)
        struct per_cpu_pageset *pset;
 
        /* avoid races with drain_pages()  */
-       local_irq_save(flags);
+       local_lock_irqsave(pa_lock, flags);
        if (zone->pageset != &boot_pageset) {
                for_each_online_cpu(cpu) {
                        pset = per_cpu_ptr(zone->pageset, cpu);
@@ -6902,7 +6964,7 @@ void zone_pcp_reset(struct zone *zone)
                free_percpu(zone->pageset);
                zone->pageset = &boot_pageset;
        }
-       local_irq_restore(flags);
+       local_unlock_irqrestore(pa_lock, flags);
 }
 
 #ifdef CONFIG_MEMORY_HOTREMOVE
diff --git a/mm/percpu.c b/mm/percpu.c
index ef6353f0adbd..33ccbac7cdb8 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1285,18 +1285,7 @@ void free_percpu(void __percpu *ptr)
 }
 EXPORT_SYMBOL_GPL(free_percpu);
 
-/**
- * is_kernel_percpu_address - test whether address is from static percpu area
- * @addr: address to test
- *
- * Test whether @addr belongs to in-kernel static percpu area.  Module
- * static percpu areas are not considered.  For those, use
- * is_module_percpu_address().
- *
- * RETURNS:
- * %true if @addr is from in-kernel static percpu area, %false otherwise.
- */
-bool is_kernel_percpu_address(unsigned long addr)
+bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr)
 {
 #ifdef CONFIG_SMP
        const size_t static_size = __per_cpu_end - __per_cpu_start;
@@ -1305,15 +1294,35 @@ bool is_kernel_percpu_address(unsigned long addr)
 
        for_each_possible_cpu(cpu) {
                void *start = per_cpu_ptr(base, cpu);
+               void *va = (void *)addr;
 
-               if ((void *)addr >= start && (void *)addr < start + static_size)
+               if (va >= start && va < start + static_size) {
+                       if (can_addr)
+                               *can_addr = (unsigned long) (va - start);
                        return true;
-        }
+               }
+       }
 #endif
        /* on UP, can't distinguish from other static vars, always false */
        return false;
 }
 
+/**
+ * is_kernel_percpu_address - test whether address is from static percpu area
+ * @addr: address to test
+ *
+ * Test whether @addr belongs to in-kernel static percpu area.  Module
+ * static percpu areas are not considered.  For those, use
+ * is_module_percpu_address().
+ *
+ * RETURNS:
+ * %true if @addr is from in-kernel static percpu area, %false otherwise.
+ */
+bool is_kernel_percpu_address(unsigned long addr)
+{
+       return __is_kernel_percpu_address(addr, NULL);
+}
+
 /**
  * per_cpu_ptr_to_phys - convert translated percpu address to physical address
  * @addr: the address to be converted to physical address
diff --git a/mm/slab.h b/mm/slab.h
index 7b6087197997..afdc57941179 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -324,7 +324,11 @@ static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
  * The slab lists for all objects.
  */
 struct kmem_cache_node {
+#ifdef CONFIG_SLUB
+       raw_spinlock_t list_lock;
+#else
        spinlock_t list_lock;
+#endif
 
 #ifdef CONFIG_SLAB
        struct list_head slabs_partial; /* partial list first, better asm code */
diff --git a/mm/slub.c b/mm/slub.c
index 4cf3a9c768b1..b183c5271607 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1075,7 +1075,7 @@ static noinline struct kmem_cache_node *free_debug_processing(
        void *object = head;
        int cnt = 0;
 
-       spin_lock_irqsave(&n->list_lock, *flags);
+       raw_spin_lock_irqsave(&n->list_lock, *flags);
        slab_lock(page);
 
        if (!check_slab(s, page))
@@ -1136,7 +1136,7 @@ static noinline struct kmem_cache_node *free_debug_processing(
 
 fail:
        slab_unlock(page);
-       spin_unlock_irqrestore(&n->list_lock, *flags);
+       raw_spin_unlock_irqrestore(&n->list_lock, *flags);
        slab_fix(s, "Object at 0x%p not freed", object);
        return NULL;
 }
@@ -1263,6 +1263,12 @@ static inline void dec_slabs_node(struct kmem_cache *s, int node,
 
 #endif /* CONFIG_SLUB_DEBUG */
 
+struct slub_free_list {
+       raw_spinlock_t          lock;
+       struct list_head        list;
+};
+static DEFINE_PER_CPU(struct slub_free_list, slub_free_list);
+
 /*
  * Hooks for other subsystems that check memory allocations. In a typical
  * production configuration these hooks all should produce no code at all.
@@ -1399,10 +1405,17 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
        gfp_t alloc_gfp;
        void *start, *p;
        int idx, order;
+       bool enableirqs = false;
 
        flags &= gfp_allowed_mask;
 
        if (gfpflags_allow_blocking(flags))
+               enableirqs = true;
+#ifdef CONFIG_PREEMPT_RT_FULL
+       if (system_state == SYSTEM_RUNNING)
+               enableirqs = true;
+#endif
+       if (enableirqs)
                local_irq_enable();
 
        flags |= s->allocflags;
@@ -1473,7 +1486,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
        page->frozen = 1;
 
 out:
-       if (gfpflags_allow_blocking(flags))
+       if (enableirqs)
                local_irq_disable();
        if (!page)
                return NULL;
@@ -1529,6 +1542,16 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
        __free_kmem_pages(page, order);
 }
 
+static void free_delayed(struct list_head *h)
+{
+       while(!list_empty(h)) {
+               struct page *page = list_first_entry(h, struct page, lru);
+
+               list_del(&page->lru);
+               __free_slab(page->slab_cache, page);
+       }
+}
+
 #define need_reserve_slab_rcu                                          \
        (sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head))
 
@@ -1560,6 +1583,12 @@ static void free_slab(struct kmem_cache *s, struct page *page)
                }
 
                call_rcu(head, rcu_free_slab);
+       } else if (irqs_disabled()) {
+               struct slub_free_list *f = this_cpu_ptr(&slub_free_list);
+
+               raw_spin_lock(&f->lock);
+               list_add(&page->lru, &f->list);
+               raw_spin_unlock(&f->lock);
        } else
                __free_slab(s, page);
 }
@@ -1673,7 +1702,7 @@ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n,
        if (!n || !n->nr_partial)
                return NULL;
 
-       spin_lock(&n->list_lock);
+       raw_spin_lock(&n->list_lock);
        list_for_each_entry_safe(page, page2, &n->partial, lru) {
                void *t;
 
@@ -1698,7 +1727,7 @@ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n,
                        break;
 
        }
-       spin_unlock(&n->list_lock);
+       raw_spin_unlock(&n->list_lock);
        return object;
 }
 
@@ -1944,7 +1973,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
                         * that acquire_slab() will see a slab page that
                         * is frozen
                         */
-                       spin_lock(&n->list_lock);
+                       raw_spin_lock(&n->list_lock);
                }
        } else {
                m = M_FULL;
@@ -1955,7 +1984,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
                         * slabs from diagnostic functions will not see
                         * any frozen slabs.
                         */
-                       spin_lock(&n->list_lock);
+                       raw_spin_lock(&n->list_lock);
                }
        }
 
@@ -1990,7 +2019,7 @@ static void deactivate_slab(struct kmem_cache *s, struct page *page,
                goto redo;
 
        if (lock)
-               spin_unlock(&n->list_lock);
+               raw_spin_unlock(&n->list_lock);
 
        if (m == M_FREE) {
                stat(s, DEACTIVATE_EMPTY);
@@ -2022,10 +2051,10 @@ static void unfreeze_partials(struct kmem_cache *s,
                n2 = get_node(s, page_to_nid(page));
                if (n != n2) {
                        if (n)
-                               spin_unlock(&n->list_lock);
+                               raw_spin_unlock(&n->list_lock);
 
                        n = n2;
-                       spin_lock(&n->list_lock);
+                       raw_spin_lock(&n->list_lock);
                }
 
                do {
@@ -2054,7 +2083,7 @@ static void unfreeze_partials(struct kmem_cache *s,
        }
 
        if (n)
-               spin_unlock(&n->list_lock);
+               raw_spin_unlock(&n->list_lock);
 
        while (discard_page) {
                page = discard_page;
@@ -2093,14 +2122,21 @@ static void put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
                        pobjects = oldpage->pobjects;
                        pages = oldpage->pages;
                        if (drain && pobjects > s->cpu_partial) {
+                               struct slub_free_list *f;
                                unsigned long flags;
+                               LIST_HEAD(tofree);
                                /*
                                 * partial array is full. Move the existing
                                 * set to the per node partial list.
                                 */
                                local_irq_save(flags);
                                unfreeze_partials(s, this_cpu_ptr(s->cpu_slab));
+                               f = this_cpu_ptr(&slub_free_list);
+                               raw_spin_lock(&f->lock);
+                               list_splice_init(&f->list, &tofree);
+                               raw_spin_unlock(&f->lock);
                                local_irq_restore(flags);
+                               free_delayed(&tofree);
                                oldpage = NULL;
                                pobjects = 0;
                                pages = 0;
@@ -2172,7 +2208,22 @@ static bool has_cpu_slab(int cpu, void *info)
 
 static void flush_all(struct kmem_cache *s)
 {
+       LIST_HEAD(tofree);
+       int cpu;
+
        on_each_cpu_cond(has_cpu_slab, flush_cpu_slab, s, 1, GFP_ATOMIC);
+       for_each_online_cpu(cpu) {
+               struct slub_free_list *f;
+
+               if (!has_cpu_slab(cpu, s))
+                       continue;
+
+               f = &per_cpu(slub_free_list, cpu);
+               raw_spin_lock_irq(&f->lock);
+               list_splice_init(&f->list, &tofree);
+               raw_spin_unlock_irq(&f->lock);
+               free_delayed(&tofree);
+       }
 }
 
 /*
@@ -2208,10 +2259,10 @@ static unsigned long count_partial(struct kmem_cache_node *n,
        unsigned long x = 0;
        struct page *page;
 
-       spin_lock_irqsave(&n->list_lock, flags);
+       raw_spin_lock_irqsave(&n->list_lock, flags);
        list_for_each_entry(page, &n->partial, lru)
                x += get_count(page);
-       spin_unlock_irqrestore(&n->list_lock, flags);
+       raw_spin_unlock_irqrestore(&n->list_lock, flags);
        return x;
 }
 #endif /* CONFIG_SLUB_DEBUG || CONFIG_SYSFS */
@@ -2349,8 +2400,10 @@ static inline void *get_freelist(struct kmem_cache *s, struct page *page)
  * already disabled (which is the case for bulk allocation).
  */
 static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
-                         unsigned long addr, struct kmem_cache_cpu *c)
+                         unsigned long addr, struct kmem_cache_cpu *c,
+                         struct list_head *to_free)
 {
+       struct slub_free_list *f;
        void *freelist;
        struct page *page;
 
@@ -2410,6 +2463,13 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
        VM_BUG_ON(!c->page->frozen);
        c->freelist = get_freepointer(s, freelist);
        c->tid = next_tid(c->tid);
+
+out:
+       f = this_cpu_ptr(&slub_free_list);
+       raw_spin_lock(&f->lock);
+       list_splice_init(&f->list, to_free);
+       raw_spin_unlock(&f->lock);
+
        return freelist;
 
 new_slab:
@@ -2441,7 +2501,7 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
        deactivate_slab(s, page, get_freepointer(s, freelist));
        c->page = NULL;
        c->freelist = NULL;
-       return freelist;
+       goto out;
 }
 
 /*
@@ -2453,6 +2513,7 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
 {
        void *p;
        unsigned long flags;
+       LIST_HEAD(tofree);
 
        local_irq_save(flags);
 #ifdef CONFIG_PREEMPT
@@ -2464,8 +2525,9 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
        c = this_cpu_ptr(s->cpu_slab);
 #endif
 
-       p = ___slab_alloc(s, gfpflags, node, addr, c);
+       p = ___slab_alloc(s, gfpflags, node, addr, c, &tofree);
        local_irq_restore(flags);
+       free_delayed(&tofree);
        return p;
 }
 
@@ -2652,7 +2714,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
 
        do {
                if (unlikely(n)) {
-                       spin_unlock_irqrestore(&n->list_lock, flags);
+                       raw_spin_unlock_irqrestore(&n->list_lock, flags);
                        n = NULL;
                }
                prior = page->freelist;
@@ -2684,7 +2746,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
                                 * Otherwise the list_lock will synchronize with
                                 * other processors updating the list of slabs.
                                 */
-                               spin_lock_irqsave(&n->list_lock, flags);
+                               raw_spin_lock_irqsave(&n->list_lock, flags);
 
                        }
                }
@@ -2726,7 +2788,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
                add_partial(n, page, DEACTIVATE_TO_TAIL);
                stat(s, FREE_ADD_PARTIAL);
        }
-       spin_unlock_irqrestore(&n->list_lock, flags);
+       raw_spin_unlock_irqrestore(&n->list_lock, flags);
        return;
 
 slab_empty:
@@ -2741,7 +2803,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
                remove_full(s, n, page);
        }
 
-       spin_unlock_irqrestore(&n->list_lock, flags);
+       raw_spin_unlock_irqrestore(&n->list_lock, flags);
        stat(s, FREE_SLAB);
        discard_slab(s, page);
 }
@@ -2913,6 +2975,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
                          void **p)
 {
        struct kmem_cache_cpu *c;
+       LIST_HEAD(to_free);
        int i;
 
        /* memcg and kmem_cache debug support */
@@ -2936,7 +2999,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
                         * of re-populating per CPU c->freelist
                         */
                        p[i] = ___slab_alloc(s, flags, NUMA_NO_NODE,
-                                           _RET_IP_, c);
+                                           _RET_IP_, c, &to_free);
                        if (unlikely(!p[i]))
                                goto error;
 
@@ -2948,6 +3011,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
        }
        c->tid = next_tid(c->tid);
        local_irq_enable();
+       free_delayed(&to_free);
 
        /* Clear memory outside IRQ disabled fastpath loop */
        if (unlikely(flags & __GFP_ZERO)) {
@@ -3095,7 +3159,7 @@ static void
 init_kmem_cache_node(struct kmem_cache_node *n)
 {
        n->nr_partial = 0;
-       spin_lock_init(&n->list_lock);
+       raw_spin_lock_init(&n->list_lock);
        INIT_LIST_HEAD(&n->partial);
 #ifdef CONFIG_SLUB_DEBUG
        atomic_long_set(&n->nr_slabs, 0);
@@ -3677,7 +3741,7 @@ int __kmem_cache_shrink(struct kmem_cache *s, bool deactivate)
                for (i = 0; i < SHRINK_PROMOTE_MAX; i++)
                        INIT_LIST_HEAD(promote + i);
 
-               spin_lock_irqsave(&n->list_lock, flags);
+               raw_spin_lock_irqsave(&n->list_lock, flags);
 
                /*
                 * Build lists of slabs to discard or promote.
@@ -3708,7 +3772,7 @@ int __kmem_cache_shrink(struct kmem_cache *s, bool deactivate)
                for (i = SHRINK_PROMOTE_MAX - 1; i >= 0; i--)
                        list_splice(promote + i, &n->partial);
 
-               spin_unlock_irqrestore(&n->list_lock, flags);
+               raw_spin_unlock_irqrestore(&n->list_lock, flags);
 
                /* Release empty slabs */
                list_for_each_entry_safe(page, t, &discard, lru)
@@ -3884,6 +3948,12 @@ void __init kmem_cache_init(void)
 {
        static __initdata struct kmem_cache boot_kmem_cache,
                boot_kmem_cache_node;
+       int cpu;
+
+       for_each_possible_cpu(cpu) {
+               raw_spin_lock_init(&per_cpu(slub_free_list, cpu).lock);
+               INIT_LIST_HEAD(&per_cpu(slub_free_list, cpu).list);
+       }
 
        if (debug_guardpage_minorder())
                slub_max_order = 0;
@@ -4127,7 +4197,7 @@ static int validate_slab_node(struct kmem_cache *s,
        struct page *page;
        unsigned long flags;
 
-       spin_lock_irqsave(&n->list_lock, flags);
+       raw_spin_lock_irqsave(&n->list_lock, flags);
 
        list_for_each_entry(page, &n->partial, lru) {
                validate_slab_slab(s, page, map);
@@ -4149,7 +4219,7 @@ static int validate_slab_node(struct kmem_cache *s,
                       s->name, count, atomic_long_read(&n->nr_slabs));
 
 out:
-       spin_unlock_irqrestore(&n->list_lock, flags);
+       raw_spin_unlock_irqrestore(&n->list_lock, flags);
        return count;
 }
 
@@ -4337,12 +4407,12 @@ static int list_locations(struct kmem_cache *s, char *buf,
                if (!atomic_long_read(&n->nr_slabs))
                        continue;
 
-               spin_lock_irqsave(&n->list_lock, flags);
+               raw_spin_lock_irqsave(&n->list_lock, flags);
                list_for_each_entry(page, &n->partial, lru)
                        process_slab(&t, s, page, alloc, map);
                list_for_each_entry(page, &n->full, lru)
                        process_slab(&t, s, page, alloc, map);
-               spin_unlock_irqrestore(&n->list_lock, flags);
+               raw_spin_unlock_irqrestore(&n->list_lock, flags);
        }
 
        for (i = 0; i < t.count; i++) {
diff --git a/mm/swap.c b/mm/swap.c
index 39395fb549c0..ad16649221d7 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -31,6 +31,7 @@
 #include <linux/memcontrol.h>
 #include <linux/gfp.h>
 #include <linux/uio.h>
+#include <linux/locallock.h>
 #include <linux/hugetlb.h>
 #include <linux/page_idle.h>
 
@@ -46,6 +47,9 @@ static DEFINE_PER_CPU(struct pagevec, lru_add_pvec);
 static DEFINE_PER_CPU(struct pagevec, lru_rotate_pvecs);
 static DEFINE_PER_CPU(struct pagevec, lru_deactivate_file_pvecs);
 
+static DEFINE_LOCAL_IRQ_LOCK(rotate_lock);
+DEFINE_LOCAL_IRQ_LOCK(swapvec_lock);
+
 /*
  * This path almost never happens for VM activity - pages are normally
  * freed via pagevecs.  But it gets used by networking.
@@ -481,11 +485,11 @@ void rotate_reclaimable_page(struct page *page)
                unsigned long flags;
 
                page_cache_get(page);
-               local_irq_save(flags);
+               local_lock_irqsave(rotate_lock, flags);
                pvec = this_cpu_ptr(&lru_rotate_pvecs);
                if (!pagevec_add(pvec, page))
                        pagevec_move_tail(pvec);
-               local_irq_restore(flags);
+               local_unlock_irqrestore(rotate_lock, flags);
        }
 }
 
@@ -536,12 +540,13 @@ static bool need_activate_page_drain(int cpu)
 void activate_page(struct page *page)
 {
        if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
-               struct pagevec *pvec = &get_cpu_var(activate_page_pvecs);
+               struct pagevec *pvec = &get_locked_var(swapvec_lock,
+                                                      activate_page_pvecs);
 
                page_cache_get(page);
                if (!pagevec_add(pvec, page))
                        pagevec_lru_move_fn(pvec, __activate_page, NULL);
-               put_cpu_var(activate_page_pvecs);
+               put_locked_var(swapvec_lock, activate_page_pvecs);
        }
 }
 
@@ -567,7 +572,7 @@ void activate_page(struct page *page)
 
 static void __lru_cache_activate_page(struct page *page)
 {
-       struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
+       struct pagevec *pvec = &get_locked_var(swapvec_lock, lru_add_pvec);
        int i;
 
        /*
@@ -589,7 +594,7 @@ static void __lru_cache_activate_page(struct page *page)
                }
        }
 
-       put_cpu_var(lru_add_pvec);
+       put_locked_var(swapvec_lock, lru_add_pvec);
 }
 
 /*
@@ -630,13 +635,13 @@ EXPORT_SYMBOL(mark_page_accessed);
 
 static void __lru_cache_add(struct page *page)
 {
-       struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
+       struct pagevec *pvec = &get_locked_var(swapvec_lock, lru_add_pvec);
 
        page_cache_get(page);
        if (!pagevec_space(pvec))
                __pagevec_lru_add(pvec);
        pagevec_add(pvec, page);
-       put_cpu_var(lru_add_pvec);
+       put_locked_var(swapvec_lock, lru_add_pvec);
 }
 
 /**
@@ -816,9 +821,15 @@ void lru_add_drain_cpu(int cpu)
                unsigned long flags;
 
                /* No harm done if a racing interrupt already did this */
-               local_irq_save(flags);
+#ifdef CONFIG_PREEMPT_RT_BASE
+               local_lock_irqsave_on(rotate_lock, flags, cpu);
+               pagevec_move_tail(pvec);
+               local_unlock_irqrestore_on(rotate_lock, flags, cpu);
+#else
+               local_lock_irqsave(rotate_lock, flags);
                pagevec_move_tail(pvec);
-               local_irq_restore(flags);
+               local_unlock_irqrestore(rotate_lock, flags);
+#endif
        }
 
        pvec = &per_cpu(lru_deactivate_file_pvecs, cpu);
@@ -846,26 +857,47 @@ void deactivate_file_page(struct page *page)
                return;
 
        if (likely(get_page_unless_zero(page))) {
-               struct pagevec *pvec = &get_cpu_var(lru_deactivate_file_pvecs);
+               struct pagevec *pvec = &get_locked_var(swapvec_lock,
+                                                      lru_deactivate_file_pvecs);
 
                if (!pagevec_add(pvec, page))
                        pagevec_lru_move_fn(pvec, lru_deactivate_file_fn, NULL);
-               put_cpu_var(lru_deactivate_file_pvecs);
+               put_locked_var(swapvec_lock, lru_deactivate_file_pvecs);
        }
 }
 
 void lru_add_drain(void)
 {
-       lru_add_drain_cpu(get_cpu());
-       put_cpu();
+       lru_add_drain_cpu(local_lock_cpu(swapvec_lock));
+       local_unlock_cpu(swapvec_lock);
 }
 
+
+#ifdef CONFIG_PREEMPT_RT_BASE
+static inline void remote_lru_add_drain(int cpu, struct cpumask *has_work)
+{
+       local_lock_on(swapvec_lock, cpu);
+       lru_add_drain_cpu(cpu);
+       local_unlock_on(swapvec_lock, cpu);
+}
+
+#else
+
 static void lru_add_drain_per_cpu(struct work_struct *dummy)
 {
        lru_add_drain();
 }
 
 static DEFINE_PER_CPU(struct work_struct, lru_add_drain_work);
+static inline void remote_lru_add_drain(int cpu, struct cpumask *has_work)
+{
+       struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
+
+       INIT_WORK(work, lru_add_drain_per_cpu);
+       schedule_work_on(cpu, work);
+       cpumask_set_cpu(cpu, has_work);
+}
+#endif
 
 void lru_add_drain_all(void)
 {
@@ -878,20 +910,17 @@ void lru_add_drain_all(void)
        cpumask_clear(&has_work);
 
        for_each_online_cpu(cpu) {
-               struct work_struct *work = &per_cpu(lru_add_drain_work, cpu);
-
                if (pagevec_count(&per_cpu(lru_add_pvec, cpu)) ||
                    pagevec_count(&per_cpu(lru_rotate_pvecs, cpu)) ||
                    pagevec_count(&per_cpu(lru_deactivate_file_pvecs, cpu)) ||
-                   need_activate_page_drain(cpu)) {
-                       INIT_WORK(work, lru_add_drain_per_cpu);
-                       schedule_work_on(cpu, work);
-                       cpumask_set_cpu(cpu, &has_work);
-               }
+                   need_activate_page_drain(cpu))
+                       remote_lru_add_drain(cpu, &has_work);
        }
 
+#ifndef CONFIG_PREEMPT_RT_BASE
        for_each_cpu(cpu, &has_work)
                flush_work(&per_cpu(lru_add_drain_work, cpu));
+#endif
 
        put_online_cpus();
        mutex_unlock(&lock);
diff --git a/mm/truncate.c b/mm/truncate.c
index f4c8270f7b84..ff2d614eb91d 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -56,8 +56,11 @@ static void clear_exceptional_entry(struct address_space *mapping,
         * protected by mapping->tree_lock.
         */
        if (!workingset_node_shadows(node) &&
-           !list_empty(&node->private_list))
-               list_lru_del(&workingset_shadow_nodes, &node->private_list);
+           !list_empty(&node->private_list)) {
+               local_lock(workingset_shadow_lock);
+               list_lru_del(&__workingset_shadow_nodes, &node->private_list);
+               local_unlock(workingset_shadow_lock);
+       }
        __radix_tree_delete_node(&mapping->page_tree, node);
 unlock:
        spin_unlock_irq(&mapping->tree_lock);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 8e3c9c5a3042..68740314ad54 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -821,7 +821,7 @@ static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
        struct vmap_block *vb;
        struct vmap_area *va;
        unsigned long vb_idx;
-       int node, err;
+       int node, err, cpu;
        void *vaddr;
 
        node = numa_node_id();
@@ -864,11 +864,12 @@ static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
        BUG_ON(err);
        radix_tree_preload_end();
 
-       vbq = &get_cpu_var(vmap_block_queue);
+       cpu = get_cpu_light();
+       vbq = this_cpu_ptr(&vmap_block_queue);
        spin_lock(&vbq->lock);
        list_add_tail_rcu(&vb->free_list, &vbq->free);
        spin_unlock(&vbq->lock);
-       put_cpu_var(vmap_block_queue);
+       put_cpu_light();
 
        return vaddr;
 }
@@ -937,6 +938,7 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
        struct vmap_block *vb;
        void *vaddr = NULL;
        unsigned int order;
+       int cpu;
 
        BUG_ON(offset_in_page(size));
        BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
@@ -951,7 +953,8 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
        order = get_order(size);
 
        rcu_read_lock();
-       vbq = &get_cpu_var(vmap_block_queue);
+       cpu = get_cpu_light();
+       vbq = this_cpu_ptr(&vmap_block_queue);
        list_for_each_entry_rcu(vb, &vbq->free, free_list) {
                unsigned long pages_off;
 
@@ -974,7 +977,7 @@ static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
                break;
        }
 
-       put_cpu_var(vmap_block_queue);
+       put_cpu_light();
        rcu_read_unlock();
 
        /* Allocate new block if nothing was found */
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 5712cdaae964..71e04bc3fe66 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -226,6 +226,7 @@ void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
        long x;
        long t;
 
+       preempt_disable_rt();
        x = delta + __this_cpu_read(*p);
 
        t = __this_cpu_read(pcp->stat_threshold);
@@ -235,6 +236,7 @@ void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
                x = 0;
        }
        __this_cpu_write(*p, x);
+       preempt_enable_rt();
 }
 EXPORT_SYMBOL(__mod_zone_page_state);
 
@@ -267,6 +269,7 @@ void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
        s8 __percpu *p = pcp->vm_stat_diff + item;
        s8 v, t;
 
+       preempt_disable_rt();
        v = __this_cpu_inc_return(*p);
        t = __this_cpu_read(pcp->stat_threshold);
        if (unlikely(v > t)) {
@@ -275,6 +278,7 @@ void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
                zone_page_state_add(v + overstep, zone, item);
                __this_cpu_write(*p, -overstep);
        }
+       preempt_enable_rt();
 }
 
 void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
@@ -289,6 +293,7 @@ void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
        s8 __percpu *p = pcp->vm_stat_diff + item;
        s8 v, t;
 
+       preempt_disable_rt();
        v = __this_cpu_dec_return(*p);
        t = __this_cpu_read(pcp->stat_threshold);
        if (unlikely(v < - t)) {
@@ -297,6 +302,7 @@ void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
                zone_page_state_add(v - overstep, zone, item);
                __this_cpu_write(*p, overstep);
        }
+       preempt_enable_rt();
 }
 
 void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
diff --git a/mm/workingset.c b/mm/workingset.c
index df66f426fdcf..6db7b243fa0d 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -264,7 +264,8 @@ void workingset_activation(struct page *page)
  * point where they would still be useful.
  */
 
-struct list_lru workingset_shadow_nodes;
+struct list_lru __workingset_shadow_nodes;
+DEFINE_LOCAL_IRQ_LOCK(workingset_shadow_lock);
 
 static unsigned long count_shadow_nodes(struct shrinker *shrinker,
                                        struct shrink_control *sc)
@@ -274,9 +275,9 @@ static unsigned long count_shadow_nodes(struct shrinker *shrinker,
        unsigned long pages;
 
        /* list_lru lock nests inside IRQ-safe mapping->tree_lock */
-       local_irq_disable();
-       shadow_nodes = list_lru_shrink_count(&workingset_shadow_nodes, sc);
-       local_irq_enable();
+       local_lock_irq(workingset_shadow_lock);
+       shadow_nodes = list_lru_shrink_count(&__workingset_shadow_nodes, sc);
+       local_unlock_irq(workingset_shadow_lock);
 
        pages = node_present_pages(sc->nid);
        /*
@@ -361,9 +362,9 @@ static enum lru_status shadow_lru_isolate(struct list_head *item,
        spin_unlock(&mapping->tree_lock);
        ret = LRU_REMOVED_RETRY;
 out:
-       local_irq_enable();
+       local_unlock_irq(workingset_shadow_lock);
        cond_resched();
-       local_irq_disable();
+       local_lock_irq(workingset_shadow_lock);
        spin_lock(lru_lock);
        return ret;
 }
@@ -374,10 +375,10 @@ static unsigned long scan_shadow_nodes(struct shrinker *shrinker,
        unsigned long ret;
 
        /* list_lru lock nests inside IRQ-safe mapping->tree_lock */
-       local_irq_disable();
-       ret =  list_lru_shrink_walk(&workingset_shadow_nodes, sc,
+       local_lock_irq(workingset_shadow_lock);
+       ret =  list_lru_shrink_walk(&__workingset_shadow_nodes, sc,
                                    shadow_lru_isolate, NULL);
-       local_irq_enable();
+       local_unlock_irq(workingset_shadow_lock);
        return ret;
 }
 
@@ -398,7 +399,7 @@ static int __init workingset_init(void)
 {
        int ret;
 
-       ret = list_lru_init_key(&workingset_shadow_nodes, &shadow_nodes_key);
+       ret = list_lru_init_key(&__workingset_shadow_nodes, &shadow_nodes_key);
        if (ret)
                goto err;
        ret = register_shrinker(&workingset_shadow_shrinker);
@@ -406,7 +407,7 @@ static int __init workingset_init(void)
                goto err_list_lru;
        return 0;
 err_list_lru:
-       list_lru_destroy(&workingset_shadow_nodes);
+       list_lru_destroy(&__workingset_shadow_nodes);
 err:
        return ret;
 }
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index c1ea19478119..529552c3716d 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -64,6 +64,7 @@
 #include <linux/debugfs.h>
 #include <linux/zsmalloc.h>
 #include <linux/zpool.h>
+#include <linux/locallock.h>
 
 /*
  * This must be power of 2 and greater than of equal to sizeof(link_free).
@@ -403,6 +404,7 @@ static unsigned int get_maxobj_per_zspage(int size, int pages_per_zspage)
 
 /* per-cpu VM mapping areas for zspage accesses that cross page boundaries */
 static DEFINE_PER_CPU(struct mapping_area, zs_map_area);
+static DEFINE_LOCAL_IRQ_LOCK(zs_map_area_lock);
 
 static int is_first_page(struct page *page)
 {
@@ -1289,7 +1291,7 @@ void *zs_map_object(struct zs_pool *pool, unsigned long handle,
        class = pool->size_class[class_idx];
        off = obj_idx_to_offset(page, obj_idx, class->size);
 
-       area = &get_cpu_var(zs_map_area);
+       area = &get_locked_var(zs_map_area_lock, zs_map_area);
        area->vm_mm = mm;
        if (off + class->size <= PAGE_SIZE) {
                /* this object is contained entirely within a page */
@@ -1342,7 +1344,7 @@ void zs_unmap_object(struct zs_pool *pool, unsigned long handle)
 
                __zs_unmap_object(area, pages, off, class->size);
        }
-       put_cpu_var(zs_map_area);
+       put_locked_var(zs_map_area_lock, zs_map_area);
        unpin_tag(handle);
 }
 EXPORT_SYMBOL_GPL(zs_unmap_object);
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index c842f40c1173..035a5f6e3de9 100644
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -213,15 +213,13 @@ void hci_send_to_sock(struct hci_dev *hdev, struct sk_buff *skb)
 }
 
 /* Send frame to sockets with specific channel */
-void hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
-                        int flag, struct sock *skip_sk)
+static void __hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
+                                 int flag, struct sock *skip_sk)
 {
        struct sock *sk;
 
        BT_DBG("channel %u len %d", channel, skb->len);
 
-       read_lock(&hci_sk_list.lock);
-
        sk_for_each(sk, &hci_sk_list.head) {
                struct sk_buff *nskb;
 
@@ -247,6 +245,13 @@ void hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
                        kfree_skb(nskb);
        }
 
+}
+
+void hci_send_to_channel(unsigned short channel, struct sk_buff *skb,
+                        int flag, struct sock *skip_sk)
+{
+       read_lock(&hci_sk_list.lock);
+       __hci_send_to_channel(channel, skb, flag, skip_sk);
        read_unlock(&hci_sk_list.lock);
 }
 
@@ -299,8 +304,8 @@ void hci_send_to_monitor(struct hci_dev *hdev, struct sk_buff *skb)
        hdr->index = cpu_to_le16(hdev->id);
        hdr->len = cpu_to_le16(skb->len);
 
-       hci_send_to_channel(HCI_CHANNEL_MONITOR, skb_copy,
-                           HCI_SOCK_TRUSTED, NULL);
+       __hci_send_to_channel(HCI_CHANNEL_MONITOR, skb_copy,
+                             HCI_SOCK_TRUSTED, NULL);
        kfree_skb(skb_copy);
 }
 
diff --git a/net/core/dev.c b/net/core/dev.c
index 3b67c1e5756f..63614e930907 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -186,6 +186,7 @@ static unsigned int napi_gen_id = NR_CPUS;
 static DEFINE_HASHTABLE(napi_hash, 8);
 
 static seqcount_t devnet_rename_seq;
+static DEFINE_MUTEX(devnet_rename_mutex);
 
 static inline void dev_base_seq_inc(struct net *net)
 {
@@ -207,14 +208,14 @@ static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
 static inline void rps_lock(struct softnet_data *sd)
 {
 #ifdef CONFIG_RPS
-       spin_lock(&sd->input_pkt_queue.lock);
+       raw_spin_lock(&sd->input_pkt_queue.raw_lock);
 #endif
 }
 
 static inline void rps_unlock(struct softnet_data *sd)
 {
 #ifdef CONFIG_RPS
-       spin_unlock(&sd->input_pkt_queue.lock);
+       raw_spin_unlock(&sd->input_pkt_queue.raw_lock);
 #endif
 }
 
@@ -884,7 +885,8 @@ int netdev_get_name(struct net *net, char *name, int ifindex)
        strcpy(name, dev->name);
        rcu_read_unlock();
        if (read_seqcount_retry(&devnet_rename_seq, seq)) {
-               cond_resched();
+               mutex_lock(&devnet_rename_mutex);
+               mutex_unlock(&devnet_rename_mutex);
                goto retry;
        }
 
@@ -1153,20 +1155,17 @@ int dev_change_name(struct net_device *dev, const char *newname)
        if (dev->flags & IFF_UP)
                return -EBUSY;
 
-       write_seqcount_begin(&devnet_rename_seq);
+       mutex_lock(&devnet_rename_mutex);
+       __raw_write_seqcount_begin(&devnet_rename_seq);
 
-       if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
-               write_seqcount_end(&devnet_rename_seq);
-               return 0;
-       }
+       if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
+               goto outunlock;
 
        memcpy(oldname, dev->name, IFNAMSIZ);
 
        err = dev_get_valid_name(net, dev, newname);
-       if (err < 0) {
-               write_seqcount_end(&devnet_rename_seq);
-               return err;
-       }
+       if (err < 0)
+               goto outunlock;
 
        if (oldname[0] && !strchr(oldname, '%'))
                netdev_info(dev, "renamed from %s\n", oldname);
@@ -1179,11 +1178,12 @@ int dev_change_name(struct net_device *dev, const char *newname)
        if (ret) {
                memcpy(dev->name, oldname, IFNAMSIZ);
                dev->name_assign_type = old_assign_type;
-               write_seqcount_end(&devnet_rename_seq);
-               return ret;
+               err = ret;
+               goto outunlock;
        }
 
-       write_seqcount_end(&devnet_rename_seq);
+       __raw_write_seqcount_end(&devnet_rename_seq);
+       mutex_unlock(&devnet_rename_mutex);
 
        netdev_adjacent_rename_links(dev, oldname);
 
@@ -1204,7 +1204,8 @@ int dev_change_name(struct net_device *dev, const char *newname)
                /* err >= 0 after dev_alloc_name() or stores the first errno */
                if (err >= 0) {
                        err = ret;
-                       write_seqcount_begin(&devnet_rename_seq);
+                       mutex_lock(&devnet_rename_mutex);
+                       __raw_write_seqcount_begin(&devnet_rename_seq);
                        memcpy(dev->name, oldname, IFNAMSIZ);
                        memcpy(oldname, newname, IFNAMSIZ);
                        dev->name_assign_type = old_assign_type;
@@ -1217,6 +1218,11 @@ int dev_change_name(struct net_device *dev, const char *newname)
        }
 
        return err;
+
+outunlock:
+       __raw_write_seqcount_end(&devnet_rename_seq);
+       mutex_unlock(&devnet_rename_mutex);
+       return err;
 }
 
 /**
@@ -2270,6 +2276,7 @@ static inline void __netif_reschedule(struct Qdisc *q)
        sd->output_queue_tailp = &q->next_sched;
        raise_softirq_irqoff(NET_TX_SOFTIRQ);
        local_irq_restore(flags);
+       preempt_check_resched_rt();
 }
 
 void __netif_schedule(struct Qdisc *q)
@@ -2354,6 +2361,7 @@ void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
        __this_cpu_write(softnet_data.completion_queue, skb);
        raise_softirq_irqoff(NET_TX_SOFTIRQ);
        local_irq_restore(flags);
+       preempt_check_resched_rt();
 }
 EXPORT_SYMBOL(__dev_kfree_skb_irq);
 
@@ -2918,7 +2926,11 @@ static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
         * This permits __QDISC___STATE_RUNNING owner to get the lock more
         * often and dequeue packets faster.
         */
+#ifdef CONFIG_PREEMPT_RT_FULL
+       contended = true;
+#else
        contended = qdisc_is_running(q);
+#endif
        if (unlikely(contended))
                spin_lock(&q->busylock);
 
@@ -2978,9 +2990,44 @@ static void skb_update_prio(struct sk_buff *skb)
 #define skb_update_prio(skb)
 #endif
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+
+static inline int xmit_rec_read(void)
+{
+       return current->xmit_recursion;
+}
+
+static inline void xmit_rec_inc(void)
+{
+       current->xmit_recursion++;
+}
+
+static inline void xmit_rec_dec(void)
+{
+       current->xmit_recursion--;
+}
+
+#else
+
 DEFINE_PER_CPU(int, xmit_recursion);
 EXPORT_SYMBOL(xmit_recursion);
 
+static inline int xmit_rec_read(void)
+{
+       return __this_cpu_read(xmit_recursion);
+}
+
+static inline void xmit_rec_inc(void)
+{
+       __this_cpu_inc(xmit_recursion);
+}
+
+static inline void xmit_rec_dec(void)
+{
+       __this_cpu_dec(xmit_recursion);
+}
+#endif
+
 #define RECURSION_LIMIT 10
 
 /**
@@ -3175,7 +3222,7 @@ static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
 
                if (txq->xmit_lock_owner != cpu) {
 
-                       if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
+                       if (xmit_rec_read() > RECURSION_LIMIT)
                                goto recursion_alert;
 
                        skb = validate_xmit_skb(skb, dev);
@@ -3185,9 +3232,9 @@ static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
                        HARD_TX_LOCK(dev, txq, cpu);
 
                        if (!netif_xmit_stopped(txq)) {
-                               __this_cpu_inc(xmit_recursion);
+                               xmit_rec_inc();
                                skb = dev_hard_start_xmit(skb, dev, txq, &rc);
-                               __this_cpu_dec(xmit_recursion);
+                               xmit_rec_dec();
                                if (dev_xmit_complete(rc)) {
                                        HARD_TX_UNLOCK(dev, txq);
                                        goto out;
@@ -3561,6 +3608,7 @@ static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
        rps_unlock(sd);
 
        local_irq_restore(flags);
+       preempt_check_resched_rt();
 
        atomic_long_inc(&skb->dev->rx_dropped);
        kfree_skb(skb);
@@ -3579,7 +3627,7 @@ static int netif_rx_internal(struct sk_buff *skb)
                struct rps_dev_flow voidflow, *rflow = &voidflow;
                int cpu;
 
-               preempt_disable();
+               migrate_disable();
                rcu_read_lock();
 
                cpu = get_rps_cpu(skb->dev, skb, &rflow);
@@ -3589,13 +3637,13 @@ static int netif_rx_internal(struct sk_buff *skb)
                ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
 
                rcu_read_unlock();
-               preempt_enable();
+               migrate_enable();
        } else
 #endif
        {
                unsigned int qtail;
-               ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
-               put_cpu();
+               ret = enqueue_to_backlog(skb, get_cpu_light(), &qtail);
+               put_cpu_light();
        }
        return ret;
 }
@@ -3629,16 +3677,44 @@ int netif_rx_ni(struct sk_buff *skb)
 
        trace_netif_rx_ni_entry(skb);
 
-       preempt_disable();
+       local_bh_disable();
        err = netif_rx_internal(skb);
-       if (local_softirq_pending())
-               do_softirq();
-       preempt_enable();
+       local_bh_enable();
 
        return err;
 }
 EXPORT_SYMBOL(netif_rx_ni);
 
+#ifdef CONFIG_PREEMPT_RT_FULL
+/*
+ * RT runs ksoftirqd as a real time thread and the root_lock is a
+ * "sleeping spinlock". If the trylock fails then we can go into an
+ * infinite loop when ksoftirqd preempted the task which actually
+ * holds the lock, because we requeue q and raise NET_TX softirq
+ * causing ksoftirqd to loop forever.
+ *
+ * It's safe to use spin_lock on RT here as softirqs run in thread
+ * context and cannot deadlock against the thread which is holding
+ * root_lock.
+ *
+ * On !RT the trylock might fail, but there we bail out from the
+ * softirq loop after 10 attempts which we can't do on RT. And the
+ * task holding root_lock cannot be preempted, so the only downside of
+ * that trylock is that we need 10 loops to decide that we should have
+ * given up in the first one :)
+ */
+static inline int take_root_lock(spinlock_t *lock)
+{
+       spin_lock(lock);
+       return 1;
+}
+#else
+static inline int take_root_lock(spinlock_t *lock)
+{
+       return spin_trylock(lock);
+}
+#endif
+
 static void net_tx_action(struct softirq_action *h)
 {
        struct softnet_data *sd = this_cpu_ptr(&softnet_data);
@@ -3680,7 +3756,7 @@ static void net_tx_action(struct softirq_action *h)
                        head = head->next_sched;
 
                        root_lock = qdisc_lock(q);
-                       if (spin_trylock(root_lock)) {
+                       if (take_root_lock(root_lock)) {
                                smp_mb__before_atomic();
                                clear_bit(__QDISC_STATE_SCHED,
                                          &q->state);
@@ -4102,7 +4178,7 @@ static void flush_backlog(void *arg)
        skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
                if (skb->dev == dev) {
                        __skb_unlink(skb, &sd->input_pkt_queue);
-                       kfree_skb(skb);
+                       __skb_queue_tail(&sd->tofree_queue, skb);
                        input_queue_head_incr(sd);
                }
        }
@@ -4111,10 +4187,13 @@ static void flush_backlog(void *arg)
        skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
                if (skb->dev == dev) {
                        __skb_unlink(skb, &sd->process_queue);
-                       kfree_skb(skb);
+                       __skb_queue_tail(&sd->tofree_queue, skb);
                        input_queue_head_incr(sd);
                }
        }
+
+       if (!skb_queue_empty(&sd->tofree_queue))
+               raise_softirq_irqoff(NET_RX_SOFTIRQ);
 }
 
 static int napi_gro_complete(struct sk_buff *skb)
@@ -4581,6 +4660,7 @@ static void net_rps_action_and_irq_enable(struct softnet_data *sd)
                sd->rps_ipi_list = NULL;
 
                local_irq_enable();
+               preempt_check_resched_rt();
 
                /* Send pending IPI's to kick RPS processing on remote cpus. */
                while (remsd) {
@@ -4594,6 +4674,7 @@ static void net_rps_action_and_irq_enable(struct softnet_data *sd)
        } else
 #endif
                local_irq_enable();
+       preempt_check_resched_rt();
 }
 
 static bool sd_has_rps_ipi_waiting(struct softnet_data *sd)
@@ -4675,9 +4756,11 @@ void __napi_schedule(struct napi_struct *n)
        local_irq_save(flags);
        ____napi_schedule(this_cpu_ptr(&softnet_data), n);
        local_irq_restore(flags);
+       preempt_check_resched_rt();
 }
 EXPORT_SYMBOL(__napi_schedule);
 
+#ifndef CONFIG_PREEMPT_RT_FULL
 /**
  * __napi_schedule_irqoff - schedule for receive
  * @n: entry to schedule
@@ -4689,6 +4772,7 @@ void __napi_schedule_irqoff(struct napi_struct *n)
        ____napi_schedule(this_cpu_ptr(&softnet_data), n);
 }
 EXPORT_SYMBOL(__napi_schedule_irqoff);
+#endif
 
 void __napi_complete(struct napi_struct *n)
 {
@@ -4912,13 +4996,21 @@ static void net_rx_action(struct softirq_action *h)
        struct softnet_data *sd = this_cpu_ptr(&softnet_data);
        unsigned long time_limit = jiffies + 2;
        int budget = netdev_budget;
+       struct sk_buff_head tofree_q;
+       struct sk_buff *skb;
        LIST_HEAD(list);
        LIST_HEAD(repoll);
 
+       __skb_queue_head_init(&tofree_q);
+
        local_irq_disable();
+       skb_queue_splice_init(&sd->tofree_queue, &tofree_q);
        list_splice_init(&sd->poll_list, &list);
        local_irq_enable();
 
+       while ((skb = __skb_dequeue(&tofree_q)))
+               kfree_skb(skb);
+
        for (;;) {
                struct napi_struct *n;
 
@@ -4948,7 +5040,7 @@ static void net_rx_action(struct softirq_action *h)
        list_splice_tail(&repoll, &list);
        list_splice(&list, &sd->poll_list);
        if (!list_empty(&sd->poll_list))
-               __raise_softirq_irqoff(NET_RX_SOFTIRQ);
+               __raise_softirq_irqoff_ksoft(NET_RX_SOFTIRQ);
 
        net_rps_action_and_irq_enable(sd);
 }
@@ -7287,7 +7379,7 @@ EXPORT_SYMBOL(free_netdev);
 void synchronize_net(void)
 {
        might_sleep();
-       if (rtnl_is_locked())
+       if (rtnl_is_locked() && !IS_ENABLED(CONFIG_PREEMPT_RT_FULL))
                synchronize_rcu_expedited();
        else
                synchronize_rcu();
@@ -7528,16 +7620,20 @@ static int dev_cpu_callback(struct notifier_block *nfb,
 
        raise_softirq_irqoff(NET_TX_SOFTIRQ);
        local_irq_enable();
+       preempt_check_resched_rt();
 
        /* Process offline CPU's input_pkt_queue */
        while ((skb = __skb_dequeue(&oldsd->process_queue))) {
                netif_rx_ni(skb);
                input_queue_head_incr(oldsd);
        }
-       while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
+       while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
                netif_rx_ni(skb);
                input_queue_head_incr(oldsd);
        }
+       while ((skb = __skb_dequeue(&oldsd->tofree_queue))) {
+               kfree_skb(skb);
+       }
 
        return NOTIFY_OK;
 }
@@ -7839,8 +7935,9 @@ static int __init net_dev_init(void)
        for_each_possible_cpu(i) {
                struct softnet_data *sd = &per_cpu(softnet_data, i);
 
-               skb_queue_head_init(&sd->input_pkt_queue);
-               skb_queue_head_init(&sd->process_queue);
+               skb_queue_head_init_raw(&sd->input_pkt_queue);
+               skb_queue_head_init_raw(&sd->process_queue);
+               skb_queue_head_init_raw(&sd->tofree_queue);
                INIT_LIST_HEAD(&sd->poll_list);
                sd->output_queue_tailp = &sd->output_queue;
 #ifdef CONFIG_RPS
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 86b619501350..f5c4897b52a0 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -63,6 +63,7 @@
 #include <linux/errqueue.h>
 #include <linux/prefetch.h>
 #include <linux/if_vlan.h>
+#include <linux/locallock.h>
 
 #include <net/protocol.h>
 #include <net/dst.h>
@@ -351,6 +352,8 @@ EXPORT_SYMBOL(build_skb);
 
 static DEFINE_PER_CPU(struct page_frag_cache, netdev_alloc_cache);
 static DEFINE_PER_CPU(struct page_frag_cache, napi_alloc_cache);
+static DEFINE_LOCAL_IRQ_LOCK(netdev_alloc_lock);
+static DEFINE_LOCAL_IRQ_LOCK(napi_alloc_cache_lock);
 
 static void *__netdev_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
 {
@@ -358,10 +361,10 @@ static void *__netdev_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
        unsigned long flags;
        void *data;
 
-       local_irq_save(flags);
+       local_lock_irqsave(netdev_alloc_lock, flags);
        nc = this_cpu_ptr(&netdev_alloc_cache);
        data = __alloc_page_frag(nc, fragsz, gfp_mask);
-       local_irq_restore(flags);
+       local_unlock_irqrestore(netdev_alloc_lock, flags);
        return data;
 }
 
@@ -380,9 +383,13 @@ EXPORT_SYMBOL(netdev_alloc_frag);
 
 static void *__napi_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
 {
-       struct page_frag_cache *nc = this_cpu_ptr(&napi_alloc_cache);
+       struct page_frag_cache *nc;
+       void *data;
 
-       return __alloc_page_frag(nc, fragsz, gfp_mask);
+       nc = &get_locked_var(napi_alloc_cache_lock, napi_alloc_cache);
+       data = __alloc_page_frag(nc, fragsz, gfp_mask);
+       put_locked_var(napi_alloc_cache_lock, napi_alloc_cache);
+       return data;
 }
 
 void *napi_alloc_frag(unsigned int fragsz)
@@ -429,13 +436,13 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev, unsigned int len,
        if (sk_memalloc_socks())
                gfp_mask |= __GFP_MEMALLOC;
 
-       local_irq_save(flags);
+       local_lock_irqsave(netdev_alloc_lock, flags);
 
        nc = this_cpu_ptr(&netdev_alloc_cache);
        data = __alloc_page_frag(nc, len, gfp_mask);
        pfmemalloc = nc->pfmemalloc;
 
-       local_irq_restore(flags);
+       local_unlock_irqrestore(netdev_alloc_lock, flags);
 
        if (unlikely(!data))
                return NULL;
@@ -476,9 +483,10 @@ EXPORT_SYMBOL(__netdev_alloc_skb);
 struct sk_buff *__napi_alloc_skb(struct napi_struct *napi, unsigned int len,
                                 gfp_t gfp_mask)
 {
-       struct page_frag_cache *nc = this_cpu_ptr(&napi_alloc_cache);
+       struct page_frag_cache *nc;
        struct sk_buff *skb;
        void *data;
+       bool pfmemalloc;
 
        len += NET_SKB_PAD + NET_IP_ALIGN;
 
@@ -496,7 +504,11 @@ struct sk_buff *__napi_alloc_skb(struct napi_struct *napi, unsigned int len,
        if (sk_memalloc_socks())
                gfp_mask |= __GFP_MEMALLOC;
 
+       nc = &get_locked_var(napi_alloc_cache_lock, napi_alloc_cache);
        data = __alloc_page_frag(nc, len, gfp_mask);
+       pfmemalloc = nc->pfmemalloc;
+       put_locked_var(napi_alloc_cache_lock, napi_alloc_cache);
+
        if (unlikely(!data))
                return NULL;
 
@@ -507,7 +519,7 @@ struct sk_buff *__napi_alloc_skb(struct napi_struct *napi, unsigned int len,
        }
 
        /* use OR instead of assignment to avoid clearing of bits in mask */
-       if (nc->pfmemalloc)
+       if (pfmemalloc)
                skb->pfmemalloc = 1;
        skb->head_frag = 1;
 
diff --git a/net/core/sock.c b/net/core/sock.c
index cd12cb6fe366..982a06dab369 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2449,12 +2449,11 @@ void lock_sock_nested(struct sock *sk, int subclass)
        if (sk->sk_lock.owned)
                __lock_sock(sk);
        sk->sk_lock.owned = 1;
-       spin_unlock(&sk->sk_lock.slock);
+       spin_unlock_bh(&sk->sk_lock.slock);
        /*
         * The sk_lock has mutex_lock() semantics here:
         */
        mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
-       local_bh_enable();
 }
 EXPORT_SYMBOL(lock_sock_nested);
 
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 36e26977c908..2c1ce3e80ee4 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -69,6 +69,7 @@
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
 #include <linux/fcntl.h>
+#include <linux/sysrq.h>
 #include <linux/socket.h>
 #include <linux/in.h>
 #include <linux/inet.h>
@@ -77,6 +78,7 @@
 #include <linux/string.h>
 #include <linux/netfilter_ipv4.h>
 #include <linux/slab.h>
+#include <linux/locallock.h>
 #include <net/snmp.h>
 #include <net/ip.h>
 #include <net/route.h>
@@ -204,6 +206,8 @@ static const struct icmp_control icmp_pointers[NR_ICMP_TYPES+1];
  *
  *     On SMP we have one ICMP socket per-cpu.
  */
+static DEFINE_LOCAL_IRQ_LOCK(icmp_sk_lock);
+
 static struct sock *icmp_sk(struct net *net)
 {
        return *this_cpu_ptr(net->ipv4.icmp_sk);
@@ -215,12 +219,18 @@ static inline struct sock *icmp_xmit_lock(struct net *net)
 
        local_bh_disable();
 
+       if (!local_trylock(icmp_sk_lock)) {
+               local_bh_enable();
+               return NULL;
+       }
+
        sk = icmp_sk(net);
 
        if (unlikely(!spin_trylock(&sk->sk_lock.slock))) {
                /* This can happen if the output path signals a
                 * dst_link_failure() for an outgoing ICMP packet.
                 */
+               local_unlock(icmp_sk_lock);
                local_bh_enable();
                return NULL;
        }
@@ -230,6 +240,7 @@ static inline struct sock *icmp_xmit_lock(struct net *net)
 static inline void icmp_xmit_unlock(struct sock *sk)
 {
        spin_unlock_bh(&sk->sk_lock.slock);
+       local_unlock(icmp_sk_lock);
 }
 
 int sysctl_icmp_msgs_per_sec __read_mostly = 1000;
@@ -358,6 +369,7 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param,
        struct sock *sk;
        struct sk_buff *skb;
 
+       local_lock(icmp_sk_lock);
        sk = icmp_sk(dev_net((*rt)->dst.dev));
        if (ip_append_data(sk, fl4, icmp_glue_bits, icmp_param,
                           icmp_param->data_len+icmp_param->head_len,
@@ -380,6 +392,7 @@ static void icmp_push_reply(struct icmp_bxm *icmp_param,
                skb->ip_summed = CHECKSUM_NONE;
                ip_push_pending_frames(sk, fl4);
        }
+       local_unlock(icmp_sk_lock);
 }
 
 /*
@@ -890,6 +903,30 @@ static bool icmp_redirect(struct sk_buff *skb)
        return true;
 }
 
+/*
+ * 32bit and 64bit have different timestamp length, so we check for
+ * the cookie at offset 20 and verify it is repeated at offset 50
+ */
+#define CO_POS0                20
+#define CO_POS1                50
+#define CO_SIZE                sizeof(int)
+#define ICMP_SYSRQ_SIZE        57
+
+/*
+ * We got a ICMP_SYSRQ_SIZE sized ping request. Check for the cookie
+ * pattern and if it matches send the next byte as a trigger to sysrq.
+ */
+static void icmp_check_sysrq(struct net *net, struct sk_buff *skb)
+{
+       int cookie = htonl(net->ipv4.sysctl_icmp_echo_sysrq);
+       char *p = skb->data;
+
+       if (!memcmp(&cookie, p + CO_POS0, CO_SIZE) &&
+           !memcmp(&cookie, p + CO_POS1, CO_SIZE) &&
+           p[CO_POS0 + CO_SIZE] == p[CO_POS1 + CO_SIZE])
+               handle_sysrq(p[CO_POS0 + CO_SIZE]);
+}
+
 /*
  *     Handle ICMP_ECHO ("ping") requests.
  *
@@ -917,6 +954,11 @@ static bool icmp_echo(struct sk_buff *skb)
                icmp_param.data_len        = skb->len;
                icmp_param.head_len        = sizeof(struct icmphdr);
                icmp_reply(&icmp_param, skb);
+
+               if (skb->len == ICMP_SYSRQ_SIZE &&
+                   net->ipv4.sysctl_icmp_echo_sysrq) {
+                       icmp_check_sysrq(net, skb);
+               }
        }
        /* should there be an ICMP stat for ignored echos? */
        return true;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 70fb352e317f..1bcd436709a4 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -817,6 +817,13 @@ static struct ctl_table ipv4_net_table[] = {
                .mode           = 0644,
                .proc_handler   = proc_dointvec
        },
+       {
+               .procname       = "icmp_echo_sysrq",
+               .data           = &init_net.ipv4.sysctl_icmp_echo_sysrq,
+               .maxlen         = sizeof(int),
+               .mode           = 0644,
+               .proc_handler   = proc_dointvec
+       },
        {
                .procname       = "icmp_ignore_bogus_error_responses",
                .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 61c93a93f228..4df48ae72abc 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -62,6 +62,7 @@
 #include <linux/init.h>
 #include <linux/times.h>
 #include <linux/slab.h>
+#include <linux/locallock.h>
 
 #include <net/net_namespace.h>
 #include <net/icmp.h>
@@ -570,6 +571,7 @@ void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb)
 }
 EXPORT_SYMBOL(tcp_v4_send_check);
 
+static DEFINE_LOCAL_IRQ_LOCK(tcp_sk_lock);
 /*
  *     This routine will send an RST to the other tcp.
  *
@@ -691,10 +693,13 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
                arg.bound_dev_if = sk->sk_bound_dev_if;
 
        arg.tos = ip_hdr(skb)->tos;
+
+       local_lock(tcp_sk_lock);
        ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk),
                              skb, &TCP_SKB_CB(skb)->header.h4.opt,
                              ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
                              &arg, arg.iov[0].iov_len);
+       local_unlock(tcp_sk_lock);
 
        TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
        TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
@@ -776,10 +781,12 @@ static void tcp_v4_send_ack(struct net *net,
        if (oif)
                arg.bound_dev_if = oif;
        arg.tos = tos;
+       local_lock(tcp_sk_lock);
        ip_send_unicast_reply(*this_cpu_ptr(net->ipv4.tcp_sk),
                              skb, &TCP_SKB_CB(skb)->header.h4.opt,
                              ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
                              &arg, arg.iov[0].iov_len);
+       local_unlock(tcp_sk_lock);
 
        TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
 }
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 3bcabc2ba4a6..c3c798388ab8 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3605,7 +3605,7 @@ void ieee80211_rx_napi(struct ieee80211_hw *hw, struct sk_buff *skb,
        struct ieee80211_supported_band *sband;
        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 
-       WARN_ON_ONCE(softirq_count() == 0);
+       WARN_ON_ONCE_NONRT(softirq_count() == 0);
 
        if (WARN_ON(status->band >= IEEE80211_NUM_BANDS))
                goto drop;
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index f39276d1c2d7..10880c89d62f 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -22,11 +22,17 @@
 #include <linux/proc_fs.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
+#include <linux/locallock.h>
 #include <net/net_namespace.h>
 #include <net/sock.h>
 
 #include "nf_internals.h"
 
+#ifdef CONFIG_PREEMPT_RT_BASE
+DEFINE_LOCAL_IRQ_LOCK(xt_write_lock);
+EXPORT_PER_CPU_SYMBOL(xt_write_lock);
+#endif
+
 static DEFINE_MUTEX(afinfo_mutex);
 
 const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO] __read_mostly;
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 92ca3e106c2b..ddb4970c3e27 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -63,6 +63,7 @@
 #include <linux/if_packet.h>
 #include <linux/wireless.h>
 #include <linux/kernel.h>
+#include <linux/delay.h>
 #include <linux/kmod.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
@@ -694,7 +695,7 @@ static void prb_retire_rx_blk_timer_expired(unsigned long data)
        if (BLOCK_NUM_PKTS(pbd)) {
                while (atomic_read(&pkc->blk_fill_in_prog)) {
                        /* Waiting for skb_copy_bits to finish... */
-                       cpu_relax();
+                       cpu_chill();
                }
        }
 
@@ -956,7 +957,7 @@ static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
                if (!(status & TP_STATUS_BLK_TMO)) {
                        while (atomic_read(&pkc->blk_fill_in_prog)) {
                                /* Waiting for skb_copy_bits to finish... */
-                               cpu_relax();
+                               cpu_chill();
                        }
                }
                prb_close_block(pkc, pbd, po, status);
diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c
index a2340748ec86..19123a97b354 100644
--- a/net/rds/ib_rdma.c
+++ b/net/rds/ib_rdma.c
@@ -34,6 +34,7 @@
 #include <linux/slab.h>
 #include <linux/rculist.h>
 #include <linux/llist.h>
+#include <linux/delay.h>
 
 #include "rds.h"
 #include "ib.h"
@@ -313,7 +314,7 @@ static inline void wait_clean_list_grace(void)
        for_each_online_cpu(cpu) {
                flag = &per_cpu(clean_list_grace, cpu);
                while (test_bit(CLEAN_LIST_BUSY_BIT, flag))
-                       cpu_relax();
+                       cpu_chill();
        }
 }
 
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index aa4725038f94..00b81cab28f3 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -893,7 +893,7 @@ void dev_deactivate_many(struct list_head *head)
        /* Wait for outstanding qdisc_run calls. */
        list_for_each_entry(dev, head, close_list)
                while (some_qdisc_is_busy(dev))
-                       yield();
+                       msleep(1);
 }
 
 void dev_deactivate(struct net_device *dev)
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index a6cbb2104667..5b69bb580617 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -340,7 +340,7 @@ void svc_xprt_do_enqueue(struct svc_xprt *xprt)
                goto out;
        }
 
-       cpu = get_cpu();
+       cpu = get_cpu_light();
        pool = svc_pool_for_cpu(xprt->xpt_server, cpu);
 
        atomic_long_inc(&pool->sp_stats.packets);
@@ -376,7 +376,7 @@ void svc_xprt_do_enqueue(struct svc_xprt *xprt)
 
                atomic_long_inc(&pool->sp_stats.threads_woken);
                wake_up_process(rqstp->rq_task);
-               put_cpu();
+               put_cpu_light();
                goto out;
        }
        rcu_read_unlock();
@@ -397,7 +397,7 @@ void svc_xprt_do_enqueue(struct svc_xprt *xprt)
                goto redo_search;
        }
        rqstp = NULL;
-       put_cpu();
+       put_cpu_light();
 out:
        trace_svc_xprt_do_enqueue(xprt, rqstp);
 }
diff --git a/scripts/mkcompile_h b/scripts/mkcompile_h
index 6fdc97ef6023..523e0420d7f0 100755
--- a/scripts/mkcompile_h
+++ b/scripts/mkcompile_h
@@ -4,7 +4,8 @@ TARGET=$1
 ARCH=$2
 SMP=$3
 PREEMPT=$4
-CC=$5
+RT=$5
+CC=$6
 
 vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
 
@@ -57,6 +58,7 @@ UTS_VERSION="#$VERSION"
 CONFIG_FLAGS=""
 if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi
 if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi
+if [ -n "$RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS RT"; fi
 UTS_VERSION="$UTS_VERSION $CONFIG_FLAGS $TIMESTAMP"
 
 # Truncate to maximum length
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 4ba64fd49759..34e50186885d 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -135,7 +135,7 @@ EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock);
 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 {
        if (!substream->pcm->nonatomic)
-               local_irq_disable();
+               local_irq_disable_nort();
        snd_pcm_stream_lock(substream);
 }
 EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq);
@@ -150,7 +150,7 @@ void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 {
        snd_pcm_stream_unlock(substream);
        if (!substream->pcm->nonatomic)
-               local_irq_enable();
+               local_irq_enable_nort();
 }
 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq);
 
@@ -158,7 +158,7 @@ unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream)
 {
        unsigned long flags = 0;
        if (!substream->pcm->nonatomic)
-               local_irq_save(flags);
+               local_irq_save_nort(flags);
        snd_pcm_stream_lock(substream);
        return flags;
 }
@@ -176,7 +176,7 @@ void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 {
        snd_pcm_stream_unlock(substream);
        if (!substream->pcm->nonatomic)
-               local_irq_restore(flags);
+               local_irq_restore_nort(flags);
 }
 EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore);
 
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index 4f70d12e392d..9378d0919ed8 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -98,8 +98,8 @@ static void async_pf_execute(struct work_struct *work)
         * This memory barrier pairs with prepare_to_wait's set_current_state()
         */
        smp_mb();
-       if (waitqueue_active(&vcpu->wq))
-               wake_up_interruptible(&vcpu->wq);
+       if (swait_active(&vcpu->wq))
+               swake_up(&vcpu->wq);
 
        mmput(mm);
        kvm_put_kvm(vcpu->kvm);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index d080f06fd8d9..a8d8150fd398 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -228,8 +228,7 @@ int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
        vcpu->kvm = kvm;
        vcpu->vcpu_id = id;
        vcpu->pid = NULL;
-       vcpu->halt_poll_ns = 0;
-       init_waitqueue_head(&vcpu->wq);
+       init_swait_queue_head(&vcpu->wq);
        kvm_async_pf_vcpu_init(vcpu);
 
        vcpu->pre_pcpu = -1;
@@ -2008,7 +2007,7 @@ static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
 {
        ktime_t start, cur;
-       DEFINE_WAIT(wait);
+       DECLARE_SWAITQUEUE(wait);
        bool waited = false;
        u64 block_ns;
 
@@ -2033,7 +2032,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
        kvm_arch_vcpu_blocking(vcpu);
 
        for (;;) {
-               prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
+               prepare_to_swait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
 
                if (kvm_vcpu_check_block(vcpu) < 0)
                        break;
@@ -2042,7 +2041,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
                schedule();
        }
 
-       finish_wait(&vcpu->wq, &wait);
+       finish_swait(&vcpu->wq, &wait);
        cur = ktime_get();
 
        kvm_arch_vcpu_unblocking(vcpu);
@@ -2074,11 +2073,11 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
 {
        int me;
        int cpu = vcpu->cpu;
-       wait_queue_head_t *wqp;
+       struct swait_queue_head *wqp;
 
        wqp = kvm_arch_vcpu_wq(vcpu);
-       if (waitqueue_active(wqp)) {
-               wake_up_interruptible(wqp);
+       if (swait_active(wqp)) {
+               swake_up(wqp);
                ++vcpu->stat.halt_wakeup;
        }
 
@@ -2179,7 +2178,7 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me)
                                continue;
                        if (vcpu == me)
                                continue;
-                       if (waitqueue_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
+                       if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
                                continue;
                        if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
                                continue;