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
61 config ARCH_SUPPORTS_UPROBES
66 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
67 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
68 select ARCH_HAS_ELF_RANDOMIZE
69 select ARCH_HAS_GCOV_PROFILE_ALL
70 select ARCH_HAS_SG_CHAIN
71 select ARCH_HAVE_NMI_SAFE_CMPXCHG
72 select ARCH_INLINE_READ_LOCK
73 select ARCH_INLINE_READ_LOCK_BH
74 select ARCH_INLINE_READ_LOCK_IRQ
75 select ARCH_INLINE_READ_LOCK_IRQSAVE
76 select ARCH_INLINE_READ_TRYLOCK
77 select ARCH_INLINE_READ_UNLOCK
78 select ARCH_INLINE_READ_UNLOCK_BH
79 select ARCH_INLINE_READ_UNLOCK_IRQ
80 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
81 select ARCH_INLINE_SPIN_LOCK
82 select ARCH_INLINE_SPIN_LOCK_BH
83 select ARCH_INLINE_SPIN_LOCK_IRQ
84 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
85 select ARCH_INLINE_SPIN_TRYLOCK
86 select ARCH_INLINE_SPIN_TRYLOCK_BH
87 select ARCH_INLINE_SPIN_UNLOCK
88 select ARCH_INLINE_SPIN_UNLOCK_BH
89 select ARCH_INLINE_SPIN_UNLOCK_IRQ
90 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
91 select ARCH_INLINE_WRITE_LOCK
92 select ARCH_INLINE_WRITE_LOCK_BH
93 select ARCH_INLINE_WRITE_LOCK_IRQ
94 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
95 select ARCH_INLINE_WRITE_TRYLOCK
96 select ARCH_INLINE_WRITE_UNLOCK
97 select ARCH_INLINE_WRITE_UNLOCK_BH
98 select ARCH_INLINE_WRITE_UNLOCK_IRQ
99 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
100 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
101 select ARCH_SUPPORTS_ATOMIC_RMW
102 select ARCH_USE_CMPXCHG_LOCKREF
103 select ARCH_WANT_IPC_PARSE_VERSION
104 select BUILDTIME_EXTABLE_SORT
105 select CLONE_BACKWARDS2
106 select DYNAMIC_FTRACE if FUNCTION_TRACER
107 select GENERIC_CLOCKEVENTS
108 select GENERIC_CPU_DEVICES if !SMP
109 select GENERIC_FIND_FIRST_BIT
110 select GENERIC_SMP_IDLE_THREAD
111 select GENERIC_TIME_VSYSCALL
112 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
113 select HAVE_ARCH_AUDITSYSCALL
114 select HAVE_ARCH_JUMP_LABEL
115 select HAVE_ARCH_SECCOMP_FILTER
116 select HAVE_ARCH_TRACEHOOK
117 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
118 select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
119 select HAVE_CMPXCHG_DOUBLE
120 select HAVE_CMPXCHG_LOCAL
121 select HAVE_DEBUG_KMEMLEAK
122 select HAVE_DYNAMIC_FTRACE
123 select HAVE_DYNAMIC_FTRACE_WITH_REGS
124 select HAVE_FTRACE_MCOUNT_RECORD
125 select HAVE_FUNCTION_GRAPH_TRACER
126 select HAVE_FUNCTION_TRACER
127 select HAVE_FUTEX_CMPXCHG if FUTEX
128 select HAVE_KERNEL_BZIP2
129 select HAVE_KERNEL_GZIP
130 select HAVE_KERNEL_LZ4
131 select HAVE_KERNEL_LZMA
132 select HAVE_KERNEL_LZO
133 select HAVE_KERNEL_XZ
135 select HAVE_KRETPROBES
137 select HAVE_LIVEPATCH
139 select HAVE_MEMBLOCK_NODE_MAP
140 select HAVE_MEMBLOCK_PHYS_MAP
141 select HAVE_MOD_ARCH_SPECIFIC
143 select HAVE_PERF_EVENTS
144 select HAVE_REGS_AND_STACK_ACCESS_API
145 select HAVE_SYSCALL_TRACEPOINTS
146 select HAVE_VIRT_CPU_ACCOUNTING
147 select MODULES_USE_ELF_RELA
150 select OLD_SIGSUSPEND3
151 select SYSCTL_EXCEPTION_TRACE
153 select VIRT_CPU_ACCOUNTING
156 config SCHED_OMIT_FRAME_POINTER
159 config PGTABLE_LEVELS
164 source "init/Kconfig"
166 source "kernel/Kconfig.freezer"
168 source "kernel/livepatch/Kconfig"
170 menu "Processor type and features"
172 config HAVE_MARCH_Z900_FEATURES
175 config HAVE_MARCH_Z990_FEATURES
177 select HAVE_MARCH_Z900_FEATURES
179 config HAVE_MARCH_Z9_109_FEATURES
181 select HAVE_MARCH_Z990_FEATURES
183 config HAVE_MARCH_Z10_FEATURES
185 select HAVE_MARCH_Z9_109_FEATURES
187 config HAVE_MARCH_Z196_FEATURES
189 select HAVE_MARCH_Z10_FEATURES
191 config HAVE_MARCH_ZEC12_FEATURES
193 select HAVE_MARCH_Z196_FEATURES
195 config HAVE_MARCH_Z13_FEATURES
197 select HAVE_MARCH_ZEC12_FEATURES
200 prompt "Processor type"
204 bool "IBM zSeries model z800 and z900"
205 select HAVE_MARCH_Z900_FEATURES
207 Select this to enable optimizations for model z800/z900 (2064 and
208 2066 series). This will enable some optimizations that are not
209 available on older ESA/390 (31 Bit) only CPUs.
212 bool "IBM zSeries model z890 and z990"
213 select HAVE_MARCH_Z990_FEATURES
215 Select this to enable optimizations for model z890/z990 (2084 and
216 2086 series). The kernel will be slightly faster but will not work
221 select HAVE_MARCH_Z9_109_FEATURES
223 Select this to enable optimizations for IBM System z9 (2094 and
224 2096 series). The kernel will be slightly faster but will not work
228 bool "IBM System z10"
229 select HAVE_MARCH_Z10_FEATURES
231 Select this to enable optimizations for IBM System z10 (2097 and
232 2098 series). The kernel will be slightly faster but will not work
236 bool "IBM zEnterprise 114 and 196"
237 select HAVE_MARCH_Z196_FEATURES
239 Select this to enable optimizations for IBM zEnterprise 114 and 196
240 (2818 and 2817 series). The kernel will be slightly faster but will
241 not work on older machines.
244 bool "IBM zBC12 and zEC12"
245 select HAVE_MARCH_ZEC12_FEATURES
247 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
248 2827 series). The kernel will be slightly faster but will not work on
253 select HAVE_MARCH_Z13_FEATURES
255 Select this to enable optimizations for IBM z13 (2964 series).
256 The kernel will be slightly faster but will not work on older
261 config MARCH_Z900_TUNE
262 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
264 config MARCH_Z990_TUNE
265 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
267 config MARCH_Z9_109_TUNE
268 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
270 config MARCH_Z10_TUNE
271 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
273 config MARCH_Z196_TUNE
274 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
276 config MARCH_ZEC12_TUNE
277 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
279 config MARCH_Z13_TUNE
280 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
283 prompt "Tune code generation"
286 Cause the compiler to tune (-mtune) the generated code for a machine.
287 This will make the code run faster on the selected machine but
288 somewhat slower on other machines.
289 This option only changes how the compiler emits instructions, not the
290 selection of instructions itself, so the resulting kernel will run on
296 Tune the generated code for the target processor for which the kernel
300 bool "IBM zSeries model z800 and z900"
303 bool "IBM zSeries model z890 and z990"
309 bool "IBM System z10"
312 bool "IBM zEnterprise 114 and 196"
315 bool "IBM zBC12 and zEC12"
327 prompt "Kernel support for 31 bit emulation"
328 select COMPAT_BINFMT_ELF if BINFMT_ELF
329 select ARCH_WANT_OLD_COMPAT_IPC
330 select COMPAT_OLD_SIGACTION
333 Select this option if you want to enable your system kernel to
334 handle system-calls from ELF binaries for 31 bit ESA. This option
335 (and some other stuff like libraries and such) is needed for
336 executing 31 bit applications. It is safe to say "Y".
338 config SYSVIPC_COMPAT
339 def_bool y if COMPAT && SYSVIPC
342 def_bool y if COMPAT && KEYS
346 prompt "Symmetric multi-processing support"
348 This enables support for systems with more than one CPU. If you have
349 a system with only one CPU, like most personal computers, say N. If
350 you have a system with more than one CPU, say Y.
352 If you say N here, the kernel will run on uni- and multiprocessor
353 machines, but will use only one CPU of a multiprocessor machine. If
354 you say Y here, the kernel will run on many, but not all,
355 uniprocessor machines. On a uniprocessor machine, the kernel
356 will run faster if you say N here.
358 See also the SMP-HOWTO available at
359 <http://www.tldp.org/docs.html#howto>.
361 Even if you don't know what to do here, say Y.
364 int "Maximum number of CPUs (2-512)"
369 This allows you to specify the maximum number of CPUs which this
370 kernel will support. The maximum supported value is 512 and the
371 minimum value which makes sense is 2.
373 This is purely to save memory - each supported CPU adds
374 approximately sixteen kilobytes to the kernel image.
378 prompt "Support for hot-pluggable CPUs"
381 Say Y here to be able to turn CPUs off and on. CPUs
382 can be controlled through /sys/devices/system/cpu/cpu#.
383 Say N if you want to disable CPU hotplug.
394 config SCHED_TOPOLOGY
396 prompt "Topology scheduler support"
402 Topology scheduler support improves the CPU scheduler's decision
403 making when dealing with machines that have multi-threading,
404 multiple cores or multiple books.
406 source kernel/Kconfig.preempt
408 source kernel/Kconfig.hz
414 config ARCH_SPARSEMEM_ENABLE
416 select SPARSEMEM_VMEMMAP_ENABLE
417 select SPARSEMEM_VMEMMAP
419 config ARCH_SPARSEMEM_DEFAULT
422 config ARCH_SELECT_MEMORY_MODEL
425 config ARCH_ENABLE_MEMORY_HOTPLUG
426 def_bool y if SPARSEMEM
428 config ARCH_ENABLE_MEMORY_HOTREMOVE
431 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
434 config FORCE_MAX_ZONEORDER
442 prompt "Pack kernel stack"
444 This option enables the compiler option -mkernel-backchain if it
445 is available. If the option is available the compiler supports
446 the new stack layout which dramatically reduces the minimum stack
447 frame size. With an old compiler a non-leaf function needs a
448 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
449 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
450 and 24 byte on 64 bit.
452 Say Y if you are unsure.
456 prompt "Detect kernel stack overflow"
458 This option enables the compiler option -mstack-guard and
459 -mstack-size if they are available. If the compiler supports them
460 it will emit additional code to each function prolog to trigger
461 an illegal operation if the kernel stack is about to overflow.
463 Say N if you are unsure.
466 int "Size of the guard area (128-1024)"
468 depends on CHECK_STACK
471 This allows you to specify the size of the guard area at the lower
472 end of the kernel stack. If the kernel stack points into the guard
473 area on function entry an illegal operation is triggered. The size
474 needs to be a power of 2. Please keep in mind that the size of an
475 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
476 The minimum size for the stack guard should be 256 for 31 bit and
479 config WARN_DYNAMIC_STACK
481 prompt "Emit compiler warnings for function with dynamic stack usage"
483 This option enables the compiler option -mwarn-dynamicstack. If the
484 compiler supports this options generates warnings for functions
485 that dynamically allocate stack space using alloca.
487 Say N if you are unsure.
495 prompt "QDIO support"
497 This driver provides the Queued Direct I/O base support for
500 To compile this driver as a module, choose M here: the
501 module will be called qdio.
507 select HAVE_DMA_ATTRS
514 config PCI_NR_FUNCTIONS
515 int "Maximum number of PCI functions (1-4096)"
519 This allows you to specify the maximum number of PCI functions which
520 this kernel will support.
523 int "Maximum number of MSI interrupts (64-32768)"
527 This defines the number of virtual interrupts the kernel will
528 provide for MSI interrupts. If you configure your system to have
529 too few drivers will fail to allocate MSI interrupts for all
532 source "drivers/pci/Kconfig"
533 source "drivers/pci/pcie/Kconfig"
534 source "drivers/pci/hotplug/Kconfig"
549 select HAVE_DMA_API_DEBUG
551 config NEED_SG_DMA_LENGTH
554 config NEED_DMA_MAP_STATE
559 prompt "Support for CHSC subchannels"
561 This driver allows usage of CHSC subchannels. A CHSC subchannel
562 is usually present on LPAR only.
563 The driver creates a device /dev/chsc, which may be used to
564 obtain I/O configuration information about the machine and
565 to issue asynchronous chsc commands (DANGEROUS).
566 You will usually only want to use this interface on a special
567 LPAR designated for system management.
569 To compile this driver as a module, choose M here: the
570 module will be called chsc_sch.
576 prompt "SCM bus driver"
578 Bus driver for Storage Class Memory.
582 prompt "Support for EADM subchannels"
585 This driver allows usage of EADM subchannels. EADM subchannels act
586 as a communication vehicle for SCM increments.
588 To compile this driver as a module, choose M here: the
589 module will be called eadm_sch.
596 bool "kernel crash dumps"
600 Generate crash dump after being started by kexec.
601 Crash dump kernels are loaded in the main kernel with kexec-tools
602 into a specially reserved region and then later executed after
603 a crash by kdump/kexec.
604 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
605 This option also enables s390 zfcpdump.
606 See also <file:Documentation/s390/zfcpdump.txt>
610 menu "Executable file formats / Emulations"
612 source "fs/Kconfig.binfmt"
616 prompt "Enable seccomp to safely compute untrusted bytecode"
619 This kernel feature is useful for number crunching applications
620 that may need to compute untrusted bytecode during their
621 execution. By using pipes or other transports made available to
622 the process as file descriptors supporting the read/write
623 syscalls, it's possible to isolate those applications in
624 their own address space using seccomp. Once seccomp is
625 enabled via /proc/<pid>/seccomp, it cannot be disabled
626 and the task is only allowed to execute a few safe syscalls
627 defined by each seccomp mode.
633 menu "Power Management"
635 config ARCH_HIBERNATION_POSSIBLE
638 source "kernel/power/Kconfig"
650 source "drivers/Kconfig"
654 source "arch/s390/Kconfig.debug"
656 source "security/Kconfig"
658 source "crypto/Kconfig"
662 menu "Virtualization"
666 prompt "Pseudo page fault support"
668 Select this option, if you want to use PFAULT pseudo page fault
669 handling under VM. If running native or in LPAR, this option
670 has no effect. If your VM does not support PFAULT, PAGEEX
671 pseudo page fault handling will be used.
672 Note that VM 4.2 supports PFAULT but has a bug in its
673 implementation that causes some problems.
674 Everybody who wants to run Linux under VM != VM4.2 should select
678 bool "VM shared kernel support"
679 depends on !JUMP_LABEL
681 Select this option, if you want to share the text segment of the
682 Linux kernel between different VM guests. This reduces memory
683 usage with lots of guests but greatly increases kernel size.
684 Also if a kernel was IPL'ed from a shared segment the kexec system
686 You should only select this option if you know what you are
687 doing and want to exploit this feature.
691 prompt "Cooperative memory management"
693 Select this option, if you want to enable the kernel interface
694 to reduce the memory size of the system. This is accomplished
695 by allocating pages of memory and put them "on hold". This only
696 makes sense for a system running under VM where the unused pages
697 will be reused by VM for other guest systems. The interface
698 allows an external monitor to balance memory of many systems.
699 Everybody who wants to run Linux under VM should select this
704 prompt "IUCV special message interface to cooperative memory management"
705 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
707 Select this option to enable the special message interface to
708 the cooperative memory management.
712 prompt "Linux - VM Monitor Stream, base infrastructure"
715 This provides a kernel interface for creating and updating z/VM APPLDATA
716 monitor records. The monitor records are updated at certain time
717 intervals, once the timer is started.
718 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
719 i.e. enables or disables monitoring on the Linux side.
720 A custom interval value (in seconds) can be written to
721 /proc/appldata/interval.
723 Defaults are 60 seconds interval and timer off.
724 The /proc entries can also be read from, showing the current settings.
728 prompt "Monitor memory management statistics"
729 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
731 This provides memory management related data to the Linux - VM Monitor
732 Stream, like paging/swapping rate, memory utilisation, etc.
733 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
734 APPLDATA monitor record, i.e. enables or disables monitoring this record
738 The /proc entry can also be read from, showing the current settings.
740 This can also be compiled as a module, which will be called
745 prompt "Monitor OS statistics"
746 depends on APPLDATA_BASE
748 This provides OS related data to the Linux - VM Monitor Stream, like
749 CPU utilisation, etc.
750 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
751 APPLDATA monitor record, i.e. enables or disables monitoring this record
755 This can also be compiled as a module, which will be called
758 config APPLDATA_NET_SUM
760 prompt "Monitor overall network statistics"
761 depends on APPLDATA_BASE && NET
763 This provides network related data to the Linux - VM Monitor Stream,
764 currently there is only a total sum of network I/O statistics, no
766 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
767 APPLDATA monitor record, i.e. enables or disables monitoring this record
771 This can also be compiled as a module, which will be called
776 prompt "s390 hypervisor file system support"
777 select SYS_HYPERVISOR
779 This is a virtual file system intended to provide accounting
780 information in an s390 hypervisor environment.
782 source "arch/s390/kvm/Kconfig"
786 prompt "s390 support for virtio devices"
788 select VIRTUALIZATION
790 select VIRTIO_CONSOLE
792 Enabling this option adds support for virtio based paravirtual device
795 Select this option if you want to run the kernel as a guest under