10 config STACKTRACE_SUPPORT
13 config HAVE_LATENCYTOP_SUPPORT
16 config RWSEM_GENERIC_SPINLOCK
19 config RWSEM_XCHGADD_ALGORITHM
22 config ARCH_HAS_ILOG2_U32
25 config ARCH_HAS_ILOG2_U64
28 config GENERIC_HWEIGHT
34 config GENERIC_BUG_RELATIVE_POINTERS
37 config ARCH_DMA_ADDR_T_64BIT
40 config GENERIC_LOCKBREAK
41 def_bool y if SMP && PREEMPT
46 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
62 config ARCH_SUPPORTS_UPROBES
67 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
68 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
69 select ARCH_HAS_ELF_RANDOMIZE
70 select ARCH_HAS_GCOV_PROFILE_ALL
71 select ARCH_HAS_SG_CHAIN
72 select ARCH_HAVE_NMI_SAFE_CMPXCHG
73 select ARCH_INLINE_READ_LOCK
74 select ARCH_INLINE_READ_LOCK_BH
75 select ARCH_INLINE_READ_LOCK_IRQ
76 select ARCH_INLINE_READ_LOCK_IRQSAVE
77 select ARCH_INLINE_READ_TRYLOCK
78 select ARCH_INLINE_READ_UNLOCK
79 select ARCH_INLINE_READ_UNLOCK_BH
80 select ARCH_INLINE_READ_UNLOCK_IRQ
81 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
82 select ARCH_INLINE_SPIN_LOCK
83 select ARCH_INLINE_SPIN_LOCK_BH
84 select ARCH_INLINE_SPIN_LOCK_IRQ
85 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
86 select ARCH_INLINE_SPIN_TRYLOCK
87 select ARCH_INLINE_SPIN_TRYLOCK_BH
88 select ARCH_INLINE_SPIN_UNLOCK
89 select ARCH_INLINE_SPIN_UNLOCK_BH
90 select ARCH_INLINE_SPIN_UNLOCK_IRQ
91 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
92 select ARCH_INLINE_WRITE_LOCK
93 select ARCH_INLINE_WRITE_LOCK_BH
94 select ARCH_INLINE_WRITE_LOCK_IRQ
95 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
96 select ARCH_INLINE_WRITE_TRYLOCK
97 select ARCH_INLINE_WRITE_UNLOCK
98 select ARCH_INLINE_WRITE_UNLOCK_BH
99 select ARCH_INLINE_WRITE_UNLOCK_IRQ
100 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
101 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
102 select ARCH_SUPPORTS_ATOMIC_RMW
103 select ARCH_SUPPORTS_NUMA_BALANCING
104 select ARCH_USE_CMPXCHG_LOCKREF
105 select ARCH_WANTS_PROT_NUMA_PROT_NONE
106 select ARCH_WANT_IPC_PARSE_VERSION
107 select BUILDTIME_EXTABLE_SORT
108 select CLONE_BACKWARDS2
109 select DYNAMIC_FTRACE if FUNCTION_TRACER
110 select GENERIC_CLOCKEVENTS
111 select GENERIC_CPU_AUTOPROBE
112 select GENERIC_CPU_DEVICES if !SMP
113 select GENERIC_FIND_FIRST_BIT
114 select GENERIC_SMP_IDLE_THREAD
115 select GENERIC_TIME_VSYSCALL
116 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
117 select HAVE_ARCH_AUDITSYSCALL
118 select HAVE_ARCH_EARLY_PFN_TO_NID
119 select HAVE_ARCH_JUMP_LABEL
120 select HAVE_ARCH_SECCOMP_FILTER
121 select HAVE_ARCH_TRACEHOOK
122 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
123 select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
124 select HAVE_CMPXCHG_DOUBLE
125 select HAVE_CMPXCHG_LOCAL
126 select HAVE_DEBUG_KMEMLEAK
127 select HAVE_DYNAMIC_FTRACE
128 select HAVE_DYNAMIC_FTRACE_WITH_REGS
129 select HAVE_FTRACE_MCOUNT_RECORD
130 select HAVE_FUNCTION_GRAPH_TRACER
131 select HAVE_FUNCTION_TRACER
132 select HAVE_FUTEX_CMPXCHG if FUTEX
133 select HAVE_KERNEL_BZIP2
134 select HAVE_KERNEL_GZIP
135 select HAVE_KERNEL_LZ4
136 select HAVE_KERNEL_LZMA
137 select HAVE_KERNEL_LZO
138 select HAVE_KERNEL_XZ
140 select HAVE_KRETPROBES
142 select HAVE_LIVEPATCH
144 select HAVE_MEMBLOCK_NODE_MAP
145 select HAVE_MEMBLOCK_PHYS_MAP
146 select HAVE_MOD_ARCH_SPECIFIC
148 select HAVE_PERF_EVENTS
149 select HAVE_REGS_AND_STACK_ACCESS_API
150 select HAVE_SYSCALL_TRACEPOINTS
151 select HAVE_VIRT_CPU_ACCOUNTING
152 select MODULES_USE_ELF_RELA
155 select OLD_SIGSUSPEND3
156 select SYSCTL_EXCEPTION_TRACE
158 select VIRT_CPU_ACCOUNTING
162 config SCHED_OMIT_FRAME_POINTER
165 config PGTABLE_LEVELS
170 source "init/Kconfig"
172 source "kernel/Kconfig.freezer"
174 source "kernel/livepatch/Kconfig"
176 menu "Processor type and features"
178 config HAVE_MARCH_Z900_FEATURES
181 config HAVE_MARCH_Z990_FEATURES
183 select HAVE_MARCH_Z900_FEATURES
185 config HAVE_MARCH_Z9_109_FEATURES
187 select HAVE_MARCH_Z990_FEATURES
189 config HAVE_MARCH_Z10_FEATURES
191 select HAVE_MARCH_Z9_109_FEATURES
193 config HAVE_MARCH_Z196_FEATURES
195 select HAVE_MARCH_Z10_FEATURES
197 config HAVE_MARCH_ZEC12_FEATURES
199 select HAVE_MARCH_Z196_FEATURES
201 config HAVE_MARCH_Z13_FEATURES
203 select HAVE_MARCH_ZEC12_FEATURES
206 prompt "Processor type"
210 bool "IBM zSeries model z800 and z900"
211 select HAVE_MARCH_Z900_FEATURES
213 Select this to enable optimizations for model z800/z900 (2064 and
214 2066 series). This will enable some optimizations that are not
215 available on older ESA/390 (31 Bit) only CPUs.
218 bool "IBM zSeries model z890 and z990"
219 select HAVE_MARCH_Z990_FEATURES
221 Select this to enable optimizations for model z890/z990 (2084 and
222 2086 series). The kernel will be slightly faster but will not work
227 select HAVE_MARCH_Z9_109_FEATURES
229 Select this to enable optimizations for IBM System z9 (2094 and
230 2096 series). The kernel will be slightly faster but will not work
234 bool "IBM System z10"
235 select HAVE_MARCH_Z10_FEATURES
237 Select this to enable optimizations for IBM System z10 (2097 and
238 2098 series). The kernel will be slightly faster but will not work
242 bool "IBM zEnterprise 114 and 196"
243 select HAVE_MARCH_Z196_FEATURES
245 Select this to enable optimizations for IBM zEnterprise 114 and 196
246 (2818 and 2817 series). The kernel will be slightly faster but will
247 not work on older machines.
250 bool "IBM zBC12 and zEC12"
251 select HAVE_MARCH_ZEC12_FEATURES
253 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
254 2827 series). The kernel will be slightly faster but will not work on
259 select HAVE_MARCH_Z13_FEATURES
261 Select this to enable optimizations for IBM z13 (2964 series).
262 The kernel will be slightly faster but will not work on older
267 config MARCH_Z900_TUNE
268 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
270 config MARCH_Z990_TUNE
271 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
273 config MARCH_Z9_109_TUNE
274 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
276 config MARCH_Z10_TUNE
277 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
279 config MARCH_Z196_TUNE
280 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
282 config MARCH_ZEC12_TUNE
283 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
285 config MARCH_Z13_TUNE
286 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
289 prompt "Tune code generation"
292 Cause the compiler to tune (-mtune) the generated code for a machine.
293 This will make the code run faster on the selected machine but
294 somewhat slower on other machines.
295 This option only changes how the compiler emits instructions, not the
296 selection of instructions itself, so the resulting kernel will run on
302 Tune the generated code for the target processor for which the kernel
306 bool "IBM zSeries model z800 and z900"
309 bool "IBM zSeries model z890 and z990"
315 bool "IBM System z10"
318 bool "IBM zEnterprise 114 and 196"
321 bool "IBM zBC12 and zEC12"
333 prompt "Kernel support for 31 bit emulation"
334 select COMPAT_BINFMT_ELF if BINFMT_ELF
335 select ARCH_WANT_OLD_COMPAT_IPC
336 select COMPAT_OLD_SIGACTION
339 Select this option if you want to enable your system kernel to
340 handle system-calls from ELF binaries for 31 bit ESA. This option
341 (and some other stuff like libraries and such) is needed for
342 executing 31 bit applications. It is safe to say "Y".
344 config SYSVIPC_COMPAT
345 def_bool y if COMPAT && SYSVIPC
348 def_bool y if COMPAT && KEYS
352 prompt "Symmetric multi-processing support"
354 This enables support for systems with more than one CPU. If you have
355 a system with only one CPU, like most personal computers, say N. If
356 you have a system with more than one CPU, say Y.
358 If you say N here, the kernel will run on uni- and multiprocessor
359 machines, but will use only one CPU of a multiprocessor machine. If
360 you say Y here, the kernel will run on many, but not all,
361 uniprocessor machines. On a uniprocessor machine, the kernel
362 will run faster if you say N here.
364 See also the SMP-HOWTO available at
365 <http://www.tldp.org/docs.html#howto>.
367 Even if you don't know what to do here, say Y.
370 int "Maximum number of CPUs (2-512)"
375 This allows you to specify the maximum number of CPUs which this
376 kernel will support. The maximum supported value is 512 and the
377 minimum value which makes sense is 2.
379 This is purely to save memory - each supported CPU adds
380 approximately sixteen kilobytes to the kernel image.
384 prompt "Support for hot-pluggable CPUs"
387 Say Y here to be able to turn CPUs off and on. CPUs
388 can be controlled through /sys/devices/system/cpu/cpu#.
389 Say N if you want to disable CPU hotplug.
394 # Some NUMA nodes have memory ranges that span
395 # other nodes. Even though a pfn is valid and
396 # between a node's start and end pfns, it may not
397 # reside on that node. See memmap_init_zone()
398 # for details. <- They meant memory holes!
399 config NODES_SPAN_OTHER_NODES
404 depends on SMP && 64BIT && SCHED_TOPOLOGY
409 This option adds NUMA support to the kernel.
411 An operation mode can be selected by appending
412 numa=<method> to the kernel command line.
414 The default behaviour is identical to appending numa=plain to
415 the command line. This will create just one node with all
416 available memory and all CPUs in it.
419 int "Maximum NUMA nodes (as a power of 2)"
424 Specify the maximum number of NUMA nodes available on the target
425 system. Increases memory reserved to accommodate various tables.
427 menu "Select NUMA modes"
431 bool "NUMA emulation"
434 Numa emulation mode will split the available system memory into
435 equal chunks which then are distributed over the configured number
436 of nodes in a round-robin manner.
438 The number of fake nodes is limited by the number of available memory
439 chunks (i.e. memory size / fake size) and the number of supported
442 The CPUs are assigned to the nodes in a way that partially respects
443 the original machine topology (if supported by the machine).
444 Fair distribution of the CPUs is not guaranteed.
447 hex "NUMA emulation memory chunk size"
449 range 0x400000 0x100000000
452 Select the default size by which the memory is chopped and then
453 assigned to emulated NUMA nodes.
455 This can be overridden by specifying
459 on the kernel command line where also suffixes K, M, G, and T are
470 config SCHED_TOPOLOGY
472 prompt "Topology scheduler support"
478 Topology scheduler support improves the CPU scheduler's decision
479 making when dealing with machines that have multi-threading,
480 multiple cores or multiple books.
482 source kernel/Kconfig.preempt
484 source kernel/Kconfig.hz
490 config ARCH_SPARSEMEM_ENABLE
492 select SPARSEMEM_VMEMMAP_ENABLE
493 select SPARSEMEM_VMEMMAP
495 config ARCH_SPARSEMEM_DEFAULT
498 config ARCH_SELECT_MEMORY_MODEL
501 config ARCH_ENABLE_MEMORY_HOTPLUG
502 def_bool y if SPARSEMEM
504 config ARCH_ENABLE_MEMORY_HOTREMOVE
507 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
510 config FORCE_MAX_ZONEORDER
518 prompt "Pack kernel stack"
520 This option enables the compiler option -mkernel-backchain if it
521 is available. If the option is available the compiler supports
522 the new stack layout which dramatically reduces the minimum stack
523 frame size. With an old compiler a non-leaf function needs a
524 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
525 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
526 and 24 byte on 64 bit.
528 Say Y if you are unsure.
532 prompt "Detect kernel stack overflow"
534 This option enables the compiler option -mstack-guard and
535 -mstack-size if they are available. If the compiler supports them
536 it will emit additional code to each function prolog to trigger
537 an illegal operation if the kernel stack is about to overflow.
539 Say N if you are unsure.
542 int "Size of the guard area (128-1024)"
544 depends on CHECK_STACK
547 This allows you to specify the size of the guard area at the lower
548 end of the kernel stack. If the kernel stack points into the guard
549 area on function entry an illegal operation is triggered. The size
550 needs to be a power of 2. Please keep in mind that the size of an
551 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
552 The minimum size for the stack guard should be 256 for 31 bit and
555 config WARN_DYNAMIC_STACK
557 prompt "Emit compiler warnings for function with dynamic stack usage"
559 This option enables the compiler option -mwarn-dynamicstack. If the
560 compiler supports this options generates warnings for functions
561 that dynamically allocate stack space using alloca.
563 Say N if you are unsure.
571 prompt "QDIO support"
573 This driver provides the Queued Direct I/O base support for
576 To compile this driver as a module, choose M here: the
577 module will be called qdio.
583 select HAVE_DMA_ATTRS
590 config PCI_NR_FUNCTIONS
591 int "Maximum number of PCI functions (1-4096)"
595 This allows you to specify the maximum number of PCI functions which
596 this kernel will support.
599 int "Maximum number of MSI interrupts (64-32768)"
603 This defines the number of virtual interrupts the kernel will
604 provide for MSI interrupts. If you configure your system to have
605 too few drivers will fail to allocate MSI interrupts for all
608 source "drivers/pci/Kconfig"
609 source "drivers/pci/pcie/Kconfig"
610 source "drivers/pci/hotplug/Kconfig"
625 select HAVE_DMA_API_DEBUG
627 config NEED_SG_DMA_LENGTH
630 config NEED_DMA_MAP_STATE
635 prompt "Support for CHSC subchannels"
637 This driver allows usage of CHSC subchannels. A CHSC subchannel
638 is usually present on LPAR only.
639 The driver creates a device /dev/chsc, which may be used to
640 obtain I/O configuration information about the machine and
641 to issue asynchronous chsc commands (DANGEROUS).
642 You will usually only want to use this interface on a special
643 LPAR designated for system management.
645 To compile this driver as a module, choose M here: the
646 module will be called chsc_sch.
652 prompt "SCM bus driver"
654 Bus driver for Storage Class Memory.
658 prompt "Support for EADM subchannels"
661 This driver allows usage of EADM subchannels. EADM subchannels act
662 as a communication vehicle for SCM increments.
664 To compile this driver as a module, choose M here: the
665 module will be called eadm_sch.
672 bool "kernel crash dumps"
676 Generate crash dump after being started by kexec.
677 Crash dump kernels are loaded in the main kernel with kexec-tools
678 into a specially reserved region and then later executed after
679 a crash by kdump/kexec.
680 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
681 This option also enables s390 zfcpdump.
682 See also <file:Documentation/s390/zfcpdump.txt>
686 menu "Executable file formats / Emulations"
688 source "fs/Kconfig.binfmt"
692 prompt "Enable seccomp to safely compute untrusted bytecode"
695 This kernel feature is useful for number crunching applications
696 that may need to compute untrusted bytecode during their
697 execution. By using pipes or other transports made available to
698 the process as file descriptors supporting the read/write
699 syscalls, it's possible to isolate those applications in
700 their own address space using seccomp. Once seccomp is
701 enabled via /proc/<pid>/seccomp, it cannot be disabled
702 and the task is only allowed to execute a few safe syscalls
703 defined by each seccomp mode.
709 menu "Power Management"
711 config ARCH_HIBERNATION_POSSIBLE
714 source "kernel/power/Kconfig"
726 source "drivers/Kconfig"
730 source "arch/s390/Kconfig.debug"
732 source "security/Kconfig"
734 source "crypto/Kconfig"
738 menu "Virtualization"
742 prompt "Pseudo page fault support"
744 Select this option, if you want to use PFAULT pseudo page fault
745 handling under VM. If running native or in LPAR, this option
746 has no effect. If your VM does not support PFAULT, PAGEEX
747 pseudo page fault handling will be used.
748 Note that VM 4.2 supports PFAULT but has a bug in its
749 implementation that causes some problems.
750 Everybody who wants to run Linux under VM != VM4.2 should select
754 bool "VM shared kernel support"
755 depends on !JUMP_LABEL
757 Select this option, if you want to share the text segment of the
758 Linux kernel between different VM guests. This reduces memory
759 usage with lots of guests but greatly increases kernel size.
760 Also if a kernel was IPL'ed from a shared segment the kexec system
762 You should only select this option if you know what you are
763 doing and want to exploit this feature.
767 prompt "Cooperative memory management"
769 Select this option, if you want to enable the kernel interface
770 to reduce the memory size of the system. This is accomplished
771 by allocating pages of memory and put them "on hold". This only
772 makes sense for a system running under VM where the unused pages
773 will be reused by VM for other guest systems. The interface
774 allows an external monitor to balance memory of many systems.
775 Everybody who wants to run Linux under VM should select this
780 prompt "IUCV special message interface to cooperative memory management"
781 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
783 Select this option to enable the special message interface to
784 the cooperative memory management.
788 prompt "Linux - VM Monitor Stream, base infrastructure"
791 This provides a kernel interface for creating and updating z/VM APPLDATA
792 monitor records. The monitor records are updated at certain time
793 intervals, once the timer is started.
794 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
795 i.e. enables or disables monitoring on the Linux side.
796 A custom interval value (in seconds) can be written to
797 /proc/appldata/interval.
799 Defaults are 60 seconds interval and timer off.
800 The /proc entries can also be read from, showing the current settings.
804 prompt "Monitor memory management statistics"
805 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
807 This provides memory management related data to the Linux - VM Monitor
808 Stream, like paging/swapping rate, memory utilisation, etc.
809 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
810 APPLDATA monitor record, i.e. enables or disables monitoring this record
814 The /proc entry can also be read from, showing the current settings.
816 This can also be compiled as a module, which will be called
821 prompt "Monitor OS statistics"
822 depends on APPLDATA_BASE
824 This provides OS related data to the Linux - VM Monitor Stream, like
825 CPU utilisation, etc.
826 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
827 APPLDATA monitor record, i.e. enables or disables monitoring this record
831 This can also be compiled as a module, which will be called
834 config APPLDATA_NET_SUM
836 prompt "Monitor overall network statistics"
837 depends on APPLDATA_BASE && NET
839 This provides network related data to the Linux - VM Monitor Stream,
840 currently there is only a total sum of network I/O statistics, no
842 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
843 APPLDATA monitor record, i.e. enables or disables monitoring this record
847 This can also be compiled as a module, which will be called
852 prompt "s390 hypervisor file system support"
853 select SYS_HYPERVISOR
855 This is a virtual file system intended to provide accounting
856 information in an s390 hypervisor environment.
858 source "arch/s390/kvm/Kconfig"
862 prompt "s390 support for virtio devices"
864 select VIRTUALIZATION
866 select VIRTIO_CONSOLE
868 Enabling this option adds support for virtio based paravirtual device
871 Select this option if you want to run the kernel as a guest under