10 config LOCKDEP_SUPPORT
13 config STACKTRACE_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
70 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
71 select ARCH_HAS_DEVMEM_IS_ALLOWED
72 select ARCH_HAS_ELF_RANDOMIZE
73 select ARCH_HAS_GCOV_PROFILE_ALL
74 select ARCH_HAS_GIGANTIC_PAGE
76 select ARCH_HAS_SG_CHAIN
77 select ARCH_HAS_UBSAN_SANITIZE_ALL
78 select ARCH_HAVE_NMI_SAFE_CMPXCHG
79 select ARCH_INLINE_READ_LOCK
80 select ARCH_INLINE_READ_LOCK_BH
81 select ARCH_INLINE_READ_LOCK_IRQ
82 select ARCH_INLINE_READ_LOCK_IRQSAVE
83 select ARCH_INLINE_READ_TRYLOCK
84 select ARCH_INLINE_READ_UNLOCK
85 select ARCH_INLINE_READ_UNLOCK_BH
86 select ARCH_INLINE_READ_UNLOCK_IRQ
87 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
88 select ARCH_INLINE_SPIN_LOCK
89 select ARCH_INLINE_SPIN_LOCK_BH
90 select ARCH_INLINE_SPIN_LOCK_IRQ
91 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
92 select ARCH_INLINE_SPIN_TRYLOCK
93 select ARCH_INLINE_SPIN_TRYLOCK_BH
94 select ARCH_INLINE_SPIN_UNLOCK
95 select ARCH_INLINE_SPIN_UNLOCK_BH
96 select ARCH_INLINE_SPIN_UNLOCK_IRQ
97 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
98 select ARCH_INLINE_WRITE_LOCK
99 select ARCH_INLINE_WRITE_LOCK_BH
100 select ARCH_INLINE_WRITE_LOCK_IRQ
101 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
102 select ARCH_INLINE_WRITE_TRYLOCK
103 select ARCH_INLINE_WRITE_UNLOCK
104 select ARCH_INLINE_WRITE_UNLOCK_BH
105 select ARCH_INLINE_WRITE_UNLOCK_IRQ
106 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
107 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
108 select ARCH_SUPPORTS_ATOMIC_RMW
109 select ARCH_SUPPORTS_NUMA_BALANCING
110 select ARCH_USE_BUILTIN_BSWAP
111 select ARCH_USE_CMPXCHG_LOCKREF
112 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
113 select ARCH_WANTS_PROT_NUMA_PROT_NONE
114 select ARCH_WANTS_UBSAN_NO_NULL
115 select ARCH_WANT_IPC_PARSE_VERSION
116 select BUILDTIME_EXTABLE_SORT
117 select CLONE_BACKWARDS2
118 select DYNAMIC_FTRACE if FUNCTION_TRACER
119 select GENERIC_CLOCKEVENTS
120 select GENERIC_CPU_AUTOPROBE
121 select GENERIC_CPU_DEVICES if !SMP
122 select GENERIC_FIND_FIRST_BIT
123 select GENERIC_SMP_IDLE_THREAD
124 select GENERIC_TIME_VSYSCALL
125 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
126 select HAVE_ARCH_AUDITSYSCALL
127 select HAVE_ARCH_EARLY_PFN_TO_NID
128 select HAVE_ARCH_HARDENED_USERCOPY
129 select HAVE_ARCH_JUMP_LABEL
130 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
131 select HAVE_ARCH_SECCOMP_FILTER
132 select HAVE_ARCH_SOFT_DIRTY
133 select HAVE_ARCH_TRACEHOOK
134 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
135 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
136 select HAVE_CMPXCHG_DOUBLE
137 select HAVE_CMPXCHG_LOCAL
138 select HAVE_DEBUG_KMEMLEAK
139 select HAVE_DMA_API_DEBUG
140 select HAVE_DYNAMIC_FTRACE
141 select HAVE_DYNAMIC_FTRACE_WITH_REGS
142 select HAVE_EFFICIENT_UNALIGNED_ACCESS
143 select HAVE_EXIT_THREAD
144 select HAVE_FTRACE_MCOUNT_RECORD
145 select HAVE_FUNCTION_GRAPH_TRACER
146 select HAVE_FUNCTION_TRACER
147 select HAVE_FUTEX_CMPXCHG if FUTEX
148 select HAVE_KERNEL_BZIP2
149 select HAVE_KERNEL_GZIP
150 select HAVE_KERNEL_LZ4
151 select HAVE_KERNEL_LZMA
152 select HAVE_KERNEL_LZO
153 select HAVE_KERNEL_XZ
155 select HAVE_KRETPROBES
157 select HAVE_LIVEPATCH
159 select HAVE_MEMBLOCK_NODE_MAP
160 select HAVE_MEMBLOCK_PHYS_MAP
161 select HAVE_MOD_ARCH_SPECIFIC
163 select HAVE_PERF_EVENTS
164 select HAVE_REGS_AND_STACK_ACCESS_API
165 select HAVE_SYSCALL_TRACEPOINTS
166 select HAVE_VIRT_CPU_ACCOUNTING
167 select MODULES_USE_ELF_RELA
170 select OLD_SIGSUSPEND3
172 select SYSCTL_EXCEPTION_TRACE
174 select VIRT_CPU_ACCOUNTING
179 config SCHED_OMIT_FRAME_POINTER
182 config PGTABLE_LEVELS
186 source "init/Kconfig"
188 source "kernel/Kconfig.freezer"
190 source "kernel/livepatch/Kconfig"
192 menu "Processor type and features"
194 config HAVE_MARCH_Z900_FEATURES
197 config HAVE_MARCH_Z990_FEATURES
199 select HAVE_MARCH_Z900_FEATURES
201 config HAVE_MARCH_Z9_109_FEATURES
203 select HAVE_MARCH_Z990_FEATURES
205 config HAVE_MARCH_Z10_FEATURES
207 select HAVE_MARCH_Z9_109_FEATURES
209 config HAVE_MARCH_Z196_FEATURES
211 select HAVE_MARCH_Z10_FEATURES
213 config HAVE_MARCH_ZEC12_FEATURES
215 select HAVE_MARCH_Z196_FEATURES
217 config HAVE_MARCH_Z13_FEATURES
219 select HAVE_MARCH_ZEC12_FEATURES
222 prompt "Processor type"
226 bool "IBM zSeries model z800 and z900"
227 select HAVE_MARCH_Z900_FEATURES
229 Select this to enable optimizations for model z800/z900 (2064 and
230 2066 series). This will enable some optimizations that are not
231 available on older ESA/390 (31 Bit) only CPUs.
234 bool "IBM zSeries model z890 and z990"
235 select HAVE_MARCH_Z990_FEATURES
237 Select this to enable optimizations for model z890/z990 (2084 and
238 2086 series). The kernel will be slightly faster but will not work
243 select HAVE_MARCH_Z9_109_FEATURES
245 Select this to enable optimizations for IBM System z9 (2094 and
246 2096 series). The kernel will be slightly faster but will not work
250 bool "IBM System z10"
251 select HAVE_MARCH_Z10_FEATURES
253 Select this to enable optimizations for IBM System z10 (2097 and
254 2098 series). The kernel will be slightly faster but will not work
258 bool "IBM zEnterprise 114 and 196"
259 select HAVE_MARCH_Z196_FEATURES
261 Select this to enable optimizations for IBM zEnterprise 114 and 196
262 (2818 and 2817 series). The kernel will be slightly faster but will
263 not work on older machines.
266 bool "IBM zBC12 and zEC12"
267 select HAVE_MARCH_ZEC12_FEATURES
269 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
270 2827 series). The kernel will be slightly faster but will not work on
274 bool "IBM z13s and z13"
275 select HAVE_MARCH_Z13_FEATURES
277 Select this to enable optimizations for IBM z13s and z13 (2965 and
278 2964 series). The kernel will be slightly faster but will not work on
283 config MARCH_Z900_TUNE
284 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
286 config MARCH_Z990_TUNE
287 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
289 config MARCH_Z9_109_TUNE
290 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
292 config MARCH_Z10_TUNE
293 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
295 config MARCH_Z196_TUNE
296 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
298 config MARCH_ZEC12_TUNE
299 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
301 config MARCH_Z13_TUNE
302 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
305 prompt "Tune code generation"
308 Cause the compiler to tune (-mtune) the generated code for a machine.
309 This will make the code run faster on the selected machine but
310 somewhat slower on other machines.
311 This option only changes how the compiler emits instructions, not the
312 selection of instructions itself, so the resulting kernel will run on
318 Tune the generated code for the target processor for which the kernel
322 bool "IBM zSeries model z800 and z900"
325 bool "IBM zSeries model z890 and z990"
331 bool "IBM System z10"
334 bool "IBM zEnterprise 114 and 196"
337 bool "IBM zBC12 and zEC12"
349 prompt "Kernel support for 31 bit emulation"
350 select COMPAT_BINFMT_ELF if BINFMT_ELF
351 select ARCH_WANT_OLD_COMPAT_IPC
352 select COMPAT_OLD_SIGACTION
355 Select this option if you want to enable your system kernel to
356 handle system-calls from ELF binaries for 31 bit ESA. This option
357 (and some other stuff like libraries and such) is needed for
358 executing 31 bit applications. It is safe to say "Y".
360 config SYSVIPC_COMPAT
361 def_bool y if COMPAT && SYSVIPC
364 def_bool y if COMPAT && KEYS
368 prompt "Symmetric multi-processing support"
370 This enables support for systems with more than one CPU. If you have
371 a system with only one CPU, like most personal computers, say N. If
372 you have a system with more than one CPU, say Y.
374 If you say N here, the kernel will run on uni- and multiprocessor
375 machines, but will use only one CPU of a multiprocessor machine. If
376 you say Y here, the kernel will run on many, but not all,
377 uniprocessor machines. On a uniprocessor machine, the kernel
378 will run faster if you say N here.
380 See also the SMP-HOWTO available at
381 <http://www.tldp.org/docs.html#howto>.
383 Even if you don't know what to do here, say Y.
386 int "Maximum number of CPUs (2-512)"
391 This allows you to specify the maximum number of CPUs which this
392 kernel will support. The maximum supported value is 512 and the
393 minimum value which makes sense is 2.
395 This is purely to save memory - each supported CPU adds
396 approximately sixteen kilobytes to the kernel image.
400 prompt "Support for hot-pluggable CPUs"
403 Say Y here to be able to turn CPUs off and on. CPUs
404 can be controlled through /sys/devices/system/cpu/cpu#.
405 Say N if you want to disable CPU hotplug.
407 # Some NUMA nodes have memory ranges that span
408 # other nodes. Even though a pfn is valid and
409 # between a node's start and end pfns, it may not
410 # reside on that node. See memmap_init_zone()
411 # for details. <- They meant memory holes!
412 config NODES_SPAN_OTHER_NODES
417 depends on SMP && SCHED_TOPOLOGY
422 This option adds NUMA support to the kernel.
424 An operation mode can be selected by appending
425 numa=<method> to the kernel command line.
427 The default behaviour is identical to appending numa=plain to
428 the command line. This will create just one node with all
429 available memory and all CPUs in it.
432 int "Maximum NUMA nodes (as a power of 2)"
437 Specify the maximum number of NUMA nodes available on the target
438 system. Increases memory reserved to accommodate various tables.
440 menu "Select NUMA modes"
444 bool "NUMA emulation"
447 Numa emulation mode will split the available system memory into
448 equal chunks which then are distributed over the configured number
449 of nodes in a round-robin manner.
451 The number of fake nodes is limited by the number of available memory
452 chunks (i.e. memory size / fake size) and the number of supported
455 The CPUs are assigned to the nodes in a way that partially respects
456 the original machine topology (if supported by the machine).
457 Fair distribution of the CPUs is not guaranteed.
460 hex "NUMA emulation memory chunk size"
462 range 0x400000 0x100000000
465 Select the default size by which the memory is chopped and then
466 assigned to emulated NUMA nodes.
468 This can be overridden by specifying
472 on the kernel command line where also suffixes K, M, G, and T are
489 config SCHED_TOPOLOGY
491 prompt "Topology scheduler support"
498 Topology scheduler support improves the CPU scheduler's decision
499 making when dealing with machines that have multi-threading,
500 multiple cores or multiple books.
502 source kernel/Kconfig.preempt
504 source kernel/Kconfig.hz
510 config ARCH_SPARSEMEM_ENABLE
512 select SPARSEMEM_VMEMMAP_ENABLE
513 select SPARSEMEM_VMEMMAP
515 config ARCH_SPARSEMEM_DEFAULT
518 config ARCH_SELECT_MEMORY_MODEL
521 config ARCH_ENABLE_MEMORY_HOTPLUG
522 def_bool y if SPARSEMEM
524 config ARCH_ENABLE_MEMORY_HOTREMOVE
527 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
530 config FORCE_MAX_ZONEORDER
538 prompt "Pack kernel stack"
540 This option enables the compiler option -mkernel-backchain if it
541 is available. If the option is available the compiler supports
542 the new stack layout which dramatically reduces the minimum stack
543 frame size. With an old compiler a non-leaf function needs a
544 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
545 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
546 and 24 byte on 64 bit.
548 Say Y if you are unsure.
552 prompt "Detect kernel stack overflow"
554 This option enables the compiler option -mstack-guard and
555 -mstack-size if they are available. If the compiler supports them
556 it will emit additional code to each function prolog to trigger
557 an illegal operation if the kernel stack is about to overflow.
559 Say N if you are unsure.
562 int "Size of the guard area (128-1024)"
564 depends on CHECK_STACK
567 This allows you to specify the size of the guard area at the lower
568 end of the kernel stack. If the kernel stack points into the guard
569 area on function entry an illegal operation is triggered. The size
570 needs to be a power of 2. Please keep in mind that the size of an
571 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
572 The minimum size for the stack guard should be 256 for 31 bit and
575 config WARN_DYNAMIC_STACK
577 prompt "Emit compiler warnings for function with dynamic stack usage"
579 This option enables the compiler option -mwarn-dynamicstack. If the
580 compiler supports this options generates warnings for functions
581 that dynamically allocate stack space using alloca.
583 Say N if you are unsure.
591 prompt "QDIO support"
593 This driver provides the Queued Direct I/O base support for
596 To compile this driver as a module, choose M here: the
597 module will be called qdio.
610 config PCI_NR_FUNCTIONS
611 int "Maximum number of PCI functions (1-4096)"
615 This allows you to specify the maximum number of PCI functions which
616 this kernel will support.
618 source "drivers/pci/Kconfig"
631 config NEED_SG_DMA_LENGTH
634 config NEED_DMA_MAP_STATE
639 prompt "Support for CHSC subchannels"
641 This driver allows usage of CHSC subchannels. A CHSC subchannel
642 is usually present on LPAR only.
643 The driver creates a device /dev/chsc, which may be used to
644 obtain I/O configuration information about the machine and
645 to issue asynchronous chsc commands (DANGEROUS).
646 You will usually only want to use this interface on a special
647 LPAR designated for system management.
649 To compile this driver as a module, choose M here: the
650 module will be called chsc_sch.
656 prompt "SCM bus driver"
658 Bus driver for Storage Class Memory.
662 prompt "Support for EADM subchannels"
665 This driver allows usage of EADM subchannels. EADM subchannels act
666 as a communication vehicle for SCM increments.
668 To compile this driver as a module, choose M here: the
669 module will be called eadm_sch.
676 bool "kernel crash dumps"
680 Generate crash dump after being started by kexec.
681 Crash dump kernels are loaded in the main kernel with kexec-tools
682 into a specially reserved region and then later executed after
683 a crash by kdump/kexec.
684 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
685 This option also enables s390 zfcpdump.
686 See also <file:Documentation/s390/zfcpdump.txt>
690 menu "Executable file formats / Emulations"
692 source "fs/Kconfig.binfmt"
696 prompt "Enable seccomp to safely compute untrusted bytecode"
699 This kernel feature is useful for number crunching applications
700 that may need to compute untrusted bytecode during their
701 execution. By using pipes or other transports made available to
702 the process as file descriptors supporting the read/write
703 syscalls, it's possible to isolate those applications in
704 their own address space using seccomp. Once seccomp is
705 enabled via /proc/<pid>/seccomp, it cannot be disabled
706 and the task is only allowed to execute a few safe syscalls
707 defined by each seccomp mode.
713 menu "Power Management"
715 config ARCH_HIBERNATION_POSSIBLE
718 source "kernel/power/Kconfig"
730 source "drivers/Kconfig"
734 source "arch/s390/Kconfig.debug"
736 source "security/Kconfig"
738 source "crypto/Kconfig"
742 menu "Virtualization"
746 prompt "Pseudo page fault support"
748 Select this option, if you want to use PFAULT pseudo page fault
749 handling under VM. If running native or in LPAR, this option
750 has no effect. If your VM does not support PFAULT, PAGEEX
751 pseudo page fault handling will be used.
752 Note that VM 4.2 supports PFAULT but has a bug in its
753 implementation that causes some problems.
754 Everybody who wants to run Linux under VM != VM4.2 should select
758 bool "VM shared kernel support"
759 depends on !JUMP_LABEL
761 Select this option, if you want to share the text segment of the
762 Linux kernel between different VM guests. This reduces memory
763 usage with lots of guests but greatly increases kernel size.
764 Also if a kernel was IPL'ed from a shared segment the kexec system
766 You should only select this option if you know what you are
767 doing and want to exploit this feature.
771 prompt "Cooperative memory management"
773 Select this option, if you want to enable the kernel interface
774 to reduce the memory size of the system. This is accomplished
775 by allocating pages of memory and put them "on hold". This only
776 makes sense for a system running under VM where the unused pages
777 will be reused by VM for other guest systems. The interface
778 allows an external monitor to balance memory of many systems.
779 Everybody who wants to run Linux under VM should select this
784 prompt "IUCV special message interface to cooperative memory management"
785 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
787 Select this option to enable the special message interface to
788 the cooperative memory management.
792 prompt "Linux - VM Monitor Stream, base infrastructure"
795 This provides a kernel interface for creating and updating z/VM APPLDATA
796 monitor records. The monitor records are updated at certain time
797 intervals, once the timer is started.
798 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
799 i.e. enables or disables monitoring on the Linux side.
800 A custom interval value (in seconds) can be written to
801 /proc/appldata/interval.
803 Defaults are 60 seconds interval and timer off.
804 The /proc entries can also be read from, showing the current settings.
808 prompt "Monitor memory management statistics"
809 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
811 This provides memory management related data to the Linux - VM Monitor
812 Stream, like paging/swapping rate, memory utilisation, etc.
813 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
814 APPLDATA monitor record, i.e. enables or disables monitoring this record
818 The /proc entry can also be read from, showing the current settings.
820 This can also be compiled as a module, which will be called
825 prompt "Monitor OS statistics"
826 depends on APPLDATA_BASE
828 This provides OS related data to the Linux - VM Monitor Stream, like
829 CPU utilisation, etc.
830 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
831 APPLDATA monitor record, i.e. enables or disables monitoring this record
835 This can also be compiled as a module, which will be called
838 config APPLDATA_NET_SUM
840 prompt "Monitor overall network statistics"
841 depends on APPLDATA_BASE && NET
843 This provides network related data to the Linux - VM Monitor Stream,
844 currently there is only a total sum of network I/O statistics, no
846 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
847 APPLDATA monitor record, i.e. enables or disables monitoring this record
851 This can also be compiled as a module, which will be called
856 prompt "s390 hypervisor file system support"
857 select SYS_HYPERVISOR
859 This is a virtual file system intended to provide accounting
860 information in an s390 hypervisor environment.
862 source "arch/s390/kvm/Kconfig"
866 prompt "s390 support for virtio devices"
868 select VIRTUALIZATION
870 select VIRTIO_CONSOLE
872 Enabling this option adds support for virtio based paravirtual device
875 Select this option if you want to run the kernel as a guest under
878 config S390_GUEST_OLD_TRANSPORT
880 prompt "Guest support for old s390 virtio transport (DEPRECATED)"
881 depends on S390_GUEST
883 Enable this option to add support for the old s390-virtio
884 transport (i.e. virtio devices NOT based on virtio-ccw). This
885 type of virtio devices is only available on the experimental
886 kuli userspace or with old (< 2.6) qemu. If you are running
887 with a modern version of qemu (which supports virtio-ccw since
888 1.4 and uses it by default since version 2.4), you probably won't