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
67 select ARCH_HAS_DEVMEM_IS_ALLOWED
68 select ARCH_HAS_ELF_RANDOMIZE
69 select ARCH_HAS_GCOV_PROFILE_ALL
70 select ARCH_HAS_GIGANTIC_PAGE
72 select ARCH_HAS_SET_MEMORY
73 select ARCH_HAS_SG_CHAIN
74 select ARCH_HAS_STRICT_KERNEL_RWX
75 select ARCH_HAS_STRICT_MODULE_RWX
76 select ARCH_HAS_UBSAN_SANITIZE_ALL
77 select ARCH_HAVE_NMI_SAFE_CMPXCHG
78 select ARCH_INLINE_READ_LOCK
79 select ARCH_INLINE_READ_LOCK_BH
80 select ARCH_INLINE_READ_LOCK_IRQ
81 select ARCH_INLINE_READ_LOCK_IRQSAVE
82 select ARCH_INLINE_READ_TRYLOCK
83 select ARCH_INLINE_READ_UNLOCK
84 select ARCH_INLINE_READ_UNLOCK_BH
85 select ARCH_INLINE_READ_UNLOCK_IRQ
86 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
87 select ARCH_INLINE_SPIN_LOCK
88 select ARCH_INLINE_SPIN_LOCK_BH
89 select ARCH_INLINE_SPIN_LOCK_IRQ
90 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
91 select ARCH_INLINE_SPIN_TRYLOCK
92 select ARCH_INLINE_SPIN_TRYLOCK_BH
93 select ARCH_INLINE_SPIN_UNLOCK
94 select ARCH_INLINE_SPIN_UNLOCK_BH
95 select ARCH_INLINE_SPIN_UNLOCK_IRQ
96 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
97 select ARCH_INLINE_WRITE_LOCK
98 select ARCH_INLINE_WRITE_LOCK_BH
99 select ARCH_INLINE_WRITE_LOCK_IRQ
100 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
101 select ARCH_INLINE_WRITE_TRYLOCK
102 select ARCH_INLINE_WRITE_UNLOCK
103 select ARCH_INLINE_WRITE_UNLOCK_BH
104 select ARCH_INLINE_WRITE_UNLOCK_IRQ
105 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
106 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
107 select ARCH_SUPPORTS_ATOMIC_RMW
108 select ARCH_SUPPORTS_NUMA_BALANCING
109 select ARCH_USE_BUILTIN_BSWAP
110 select ARCH_USE_CMPXCHG_LOCKREF
111 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
112 select ARCH_WANTS_PROT_NUMA_PROT_NONE
113 select ARCH_WANTS_UBSAN_NO_NULL
114 select ARCH_WANT_IPC_PARSE_VERSION
115 select BUILDTIME_EXTABLE_SORT
116 select CLONE_BACKWARDS2
117 select DYNAMIC_FTRACE if FUNCTION_TRACER
118 select GENERIC_CLOCKEVENTS
119 select GENERIC_CPU_AUTOPROBE
120 select GENERIC_CPU_DEVICES if !SMP
121 select GENERIC_FIND_FIRST_BIT
122 select GENERIC_SMP_IDLE_THREAD
123 select GENERIC_TIME_VSYSCALL
124 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
125 select HAVE_ARCH_AUDITSYSCALL
126 select HAVE_ARCH_EARLY_PFN_TO_NID
127 select HAVE_ARCH_HARDENED_USERCOPY
128 select HAVE_ARCH_JUMP_LABEL
129 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
130 select HAVE_ARCH_SECCOMP_FILTER
131 select HAVE_ARCH_SOFT_DIRTY
132 select HAVE_ARCH_TRACEHOOK
133 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
134 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
135 select HAVE_CMPXCHG_DOUBLE
136 select HAVE_CMPXCHG_LOCAL
137 select HAVE_COPY_THREAD_TLS
138 select HAVE_DEBUG_KMEMLEAK
139 select HAVE_DMA_API_DEBUG
140 select HAVE_DMA_CONTIGUOUS
142 select HAVE_DYNAMIC_FTRACE
143 select HAVE_DYNAMIC_FTRACE_WITH_REGS
144 select HAVE_EFFICIENT_UNALIGNED_ACCESS
145 select HAVE_EXIT_THREAD
146 select HAVE_FTRACE_MCOUNT_RECORD
147 select HAVE_FUNCTION_GRAPH_TRACER
148 select HAVE_FUNCTION_TRACER
149 select HAVE_FUTEX_CMPXCHG if FUTEX
150 select HAVE_KERNEL_BZIP2
151 select HAVE_KERNEL_GZIP
152 select HAVE_KERNEL_LZ4
153 select HAVE_KERNEL_LZMA
154 select HAVE_KERNEL_LZO
155 select HAVE_KERNEL_XZ
157 select HAVE_KRETPROBES
159 select HAVE_LIVEPATCH
161 select HAVE_MEMBLOCK_NODE_MAP
162 select HAVE_MEMBLOCK_PHYS_MAP
163 select HAVE_MOD_ARCH_SPECIFIC
165 select HAVE_PERF_EVENTS
166 select HAVE_REGS_AND_STACK_ACCESS_API
167 select HAVE_SYSCALL_TRACEPOINTS
168 select HAVE_VIRT_CPU_ACCOUNTING
169 select MODULES_USE_ELF_RELA
172 select OLD_SIGSUSPEND3
174 select SYSCTL_EXCEPTION_TRACE
175 select THREAD_INFO_IN_TASK
177 select VIRT_CPU_ACCOUNTING
178 select ARCH_HAS_SCALED_CPUTIME
183 config SCHED_OMIT_FRAME_POINTER
186 config PGTABLE_LEVELS
190 source "init/Kconfig"
192 source "kernel/Kconfig.freezer"
194 source "kernel/livepatch/Kconfig"
196 menu "Processor type and features"
198 config HAVE_MARCH_Z900_FEATURES
201 config HAVE_MARCH_Z990_FEATURES
203 select HAVE_MARCH_Z900_FEATURES
205 config HAVE_MARCH_Z9_109_FEATURES
207 select HAVE_MARCH_Z990_FEATURES
209 config HAVE_MARCH_Z10_FEATURES
211 select HAVE_MARCH_Z9_109_FEATURES
213 config HAVE_MARCH_Z196_FEATURES
215 select HAVE_MARCH_Z10_FEATURES
217 config HAVE_MARCH_ZEC12_FEATURES
219 select HAVE_MARCH_Z196_FEATURES
221 config HAVE_MARCH_Z13_FEATURES
223 select HAVE_MARCH_ZEC12_FEATURES
226 prompt "Processor type"
230 bool "IBM zSeries model z800 and z900"
231 select HAVE_MARCH_Z900_FEATURES
233 Select this to enable optimizations for model z800/z900 (2064 and
234 2066 series). This will enable some optimizations that are not
235 available on older ESA/390 (31 Bit) only CPUs.
238 bool "IBM zSeries model z890 and z990"
239 select HAVE_MARCH_Z990_FEATURES
241 Select this to enable optimizations for model z890/z990 (2084 and
242 2086 series). The kernel will be slightly faster but will not work
247 select HAVE_MARCH_Z9_109_FEATURES
249 Select this to enable optimizations for IBM System z9 (2094 and
250 2096 series). The kernel will be slightly faster but will not work
254 bool "IBM System z10"
255 select HAVE_MARCH_Z10_FEATURES
257 Select this to enable optimizations for IBM System z10 (2097 and
258 2098 series). The kernel will be slightly faster but will not work
262 bool "IBM zEnterprise 114 and 196"
263 select HAVE_MARCH_Z196_FEATURES
265 Select this to enable optimizations for IBM zEnterprise 114 and 196
266 (2818 and 2817 series). The kernel will be slightly faster but will
267 not work on older machines.
270 bool "IBM zBC12 and zEC12"
271 select HAVE_MARCH_ZEC12_FEATURES
273 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
274 2827 series). The kernel will be slightly faster but will not work on
278 bool "IBM z13s and z13"
279 select HAVE_MARCH_Z13_FEATURES
281 Select this to enable optimizations for IBM z13s and z13 (2965 and
282 2964 series). The kernel will be slightly faster but will not work on
287 config MARCH_Z900_TUNE
288 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
290 config MARCH_Z990_TUNE
291 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
293 config MARCH_Z9_109_TUNE
294 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
296 config MARCH_Z10_TUNE
297 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
299 config MARCH_Z196_TUNE
300 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
302 config MARCH_ZEC12_TUNE
303 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
305 config MARCH_Z13_TUNE
306 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
309 prompt "Tune code generation"
312 Cause the compiler to tune (-mtune) the generated code for a machine.
313 This will make the code run faster on the selected machine but
314 somewhat slower on other machines.
315 This option only changes how the compiler emits instructions, not the
316 selection of instructions itself, so the resulting kernel will run on
322 Tune the generated code for the target processor for which the kernel
326 bool "IBM zSeries model z800 and z900"
329 bool "IBM zSeries model z890 and z990"
335 bool "IBM System z10"
338 bool "IBM zEnterprise 114 and 196"
341 bool "IBM zBC12 and zEC12"
353 prompt "Kernel support for 31 bit emulation"
354 select COMPAT_BINFMT_ELF if BINFMT_ELF
355 select ARCH_WANT_OLD_COMPAT_IPC
356 select COMPAT_OLD_SIGACTION
359 Select this option if you want to enable your system kernel to
360 handle system-calls from ELF binaries for 31 bit ESA. This option
361 (and some other stuff like libraries and such) is needed for
362 executing 31 bit applications. It is safe to say "Y".
364 config SYSVIPC_COMPAT
365 def_bool y if COMPAT && SYSVIPC
368 def_bool y if COMPAT && KEYS
372 prompt "Symmetric multi-processing support"
374 This enables support for systems with more than one CPU. If you have
375 a system with only one CPU, like most personal computers, say N. If
376 you have a system with more than one CPU, say Y.
378 If you say N here, the kernel will run on uni- and multiprocessor
379 machines, but will use only one CPU of a multiprocessor machine. If
380 you say Y here, the kernel will run on many, but not all,
381 uniprocessor machines. On a uniprocessor machine, the kernel
382 will run faster if you say N here.
384 See also the SMP-HOWTO available at
385 <http://www.tldp.org/docs.html#howto>.
387 Even if you don't know what to do here, say Y.
390 int "Maximum number of CPUs (2-512)"
395 This allows you to specify the maximum number of CPUs which this
396 kernel will support. The maximum supported value is 512 and the
397 minimum value which makes sense is 2.
399 This is purely to save memory - each supported CPU adds
400 approximately sixteen kilobytes to the kernel image.
404 prompt "Support for hot-pluggable CPUs"
407 Say Y here to be able to turn CPUs off and on. CPUs
408 can be controlled through /sys/devices/system/cpu/cpu#.
409 Say N if you want to disable CPU hotplug.
411 # Some NUMA nodes have memory ranges that span
412 # other nodes. Even though a pfn is valid and
413 # between a node's start and end pfns, it may not
414 # reside on that node. See memmap_init_zone()
415 # for details. <- They meant memory holes!
416 config NODES_SPAN_OTHER_NODES
421 depends on SMP && SCHED_TOPOLOGY
426 This option adds NUMA support to the kernel.
428 An operation mode can be selected by appending
429 numa=<method> to the kernel command line.
431 The default behaviour is identical to appending numa=plain to
432 the command line. This will create just one node with all
433 available memory and all CPUs in it.
436 int "Maximum NUMA nodes (as a power of 2)"
441 Specify the maximum number of NUMA nodes available on the target
442 system. Increases memory reserved to accommodate various tables.
444 menu "Select NUMA modes"
448 bool "NUMA emulation"
451 Numa emulation mode will split the available system memory into
452 equal chunks which then are distributed over the configured number
453 of nodes in a round-robin manner.
455 The number of fake nodes is limited by the number of available memory
456 chunks (i.e. memory size / fake size) and the number of supported
459 The CPUs are assigned to the nodes in a way that partially respects
460 the original machine topology (if supported by the machine).
461 Fair distribution of the CPUs is not guaranteed.
464 hex "NUMA emulation memory chunk size"
466 range 0x400000 0x100000000
469 Select the default size by which the memory is chopped and then
470 assigned to emulated NUMA nodes.
472 This can be overridden by specifying
476 on the kernel command line where also suffixes K, M, G, and T are
493 config SCHED_TOPOLOGY
495 prompt "Topology scheduler support"
502 Topology scheduler support improves the CPU scheduler's decision
503 making when dealing with machines that have multi-threading,
504 multiple cores or multiple books.
506 source kernel/Kconfig.preempt
508 source kernel/Kconfig.hz
514 config ARCH_SPARSEMEM_ENABLE
516 select SPARSEMEM_VMEMMAP_ENABLE
517 select SPARSEMEM_VMEMMAP
519 config ARCH_SPARSEMEM_DEFAULT
522 config ARCH_SELECT_MEMORY_MODEL
525 config ARCH_ENABLE_MEMORY_HOTPLUG
526 def_bool y if SPARSEMEM
528 config ARCH_ENABLE_MEMORY_HOTREMOVE
531 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
534 config FORCE_MAX_ZONEORDER
542 prompt "Pack kernel stack"
544 This option enables the compiler option -mkernel-backchain if it
545 is available. If the option is available the compiler supports
546 the new stack layout which dramatically reduces the minimum stack
547 frame size. With an old compiler a non-leaf function needs a
548 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
549 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
550 and 24 byte on 64 bit.
552 Say Y if you are unsure.
556 prompt "Detect kernel stack overflow"
558 This option enables the compiler option -mstack-guard and
559 -mstack-size if they are available. If the compiler supports them
560 it will emit additional code to each function prolog to trigger
561 an illegal operation if the kernel stack is about to overflow.
563 Say N if you are unsure.
566 int "Size of the guard area (128-1024)"
568 depends on CHECK_STACK
571 This allows you to specify the size of the guard area at the lower
572 end of the kernel stack. If the kernel stack points into the guard
573 area on function entry an illegal operation is triggered. The size
574 needs to be a power of 2. Please keep in mind that the size of an
575 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
576 The minimum size for the stack guard should be 256 for 31 bit and
579 config WARN_DYNAMIC_STACK
581 prompt "Emit compiler warnings for function with dynamic stack usage"
583 This option enables the compiler option -mwarn-dynamicstack. If the
584 compiler supports this options generates warnings for functions
585 that dynamically allocate stack space using alloca.
587 Say N if you are unsure.
595 prompt "QDIO support"
597 This driver provides the Queued Direct I/O base support for
600 To compile this driver as a module, choose M here: the
601 module will be called qdio.
614 config PCI_NR_FUNCTIONS
615 int "Maximum number of PCI functions (1-4096)"
619 This allows you to specify the maximum number of PCI functions which
620 this kernel will support.
622 source "drivers/pci/Kconfig"
635 config NEED_SG_DMA_LENGTH
638 config NEED_DMA_MAP_STATE
643 prompt "Support for CHSC subchannels"
645 This driver allows usage of CHSC subchannels. A CHSC subchannel
646 is usually present on LPAR only.
647 The driver creates a device /dev/chsc, which may be used to
648 obtain I/O configuration information about the machine and
649 to issue asynchronous chsc commands (DANGEROUS).
650 You will usually only want to use this interface on a special
651 LPAR designated for system management.
653 To compile this driver as a module, choose M here: the
654 module will be called chsc_sch.
660 prompt "SCM bus driver"
662 Bus driver for Storage Class Memory.
666 prompt "Support for EADM subchannels"
669 This driver allows usage of EADM subchannels. EADM subchannels act
670 as a communication vehicle for SCM increments.
672 To compile this driver as a module, choose M here: the
673 module will be called eadm_sch.
680 bool "kernel crash dumps"
684 Generate crash dump after being started by kexec.
685 Crash dump kernels are loaded in the main kernel with kexec-tools
686 into a specially reserved region and then later executed after
687 a crash by kdump/kexec.
688 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
689 This option also enables s390 zfcpdump.
690 See also <file:Documentation/s390/zfcpdump.txt>
694 menu "Executable file formats / Emulations"
696 source "fs/Kconfig.binfmt"
700 prompt "Enable seccomp to safely compute untrusted bytecode"
703 This kernel feature is useful for number crunching applications
704 that may need to compute untrusted bytecode during their
705 execution. By using pipes or other transports made available to
706 the process as file descriptors supporting the read/write
707 syscalls, it's possible to isolate those applications in
708 their own address space using seccomp. Once seccomp is
709 enabled via /proc/<pid>/seccomp, it cannot be disabled
710 and the task is only allowed to execute a few safe syscalls
711 defined by each seccomp mode.
717 menu "Power Management"
719 config ARCH_HIBERNATION_POSSIBLE
722 source "kernel/power/Kconfig"
734 source "drivers/Kconfig"
738 source "arch/s390/Kconfig.debug"
740 source "security/Kconfig"
742 source "crypto/Kconfig"
746 menu "Virtualization"
750 prompt "Pseudo page fault support"
752 Select this option, if you want to use PFAULT pseudo page fault
753 handling under VM. If running native or in LPAR, this option
754 has no effect. If your VM does not support PFAULT, PAGEEX
755 pseudo page fault handling will be used.
756 Note that VM 4.2 supports PFAULT but has a bug in its
757 implementation that causes some problems.
758 Everybody who wants to run Linux under VM != VM4.2 should select
762 bool "VM shared kernel support"
763 depends on !JUMP_LABEL
765 Select this option, if you want to share the text segment of the
766 Linux kernel between different VM guests. This reduces memory
767 usage with lots of guests but greatly increases kernel size.
768 Also if a kernel was IPL'ed from a shared segment the kexec system
770 You should only select this option if you know what you are
771 doing and want to exploit this feature.
775 prompt "Cooperative memory management"
777 Select this option, if you want to enable the kernel interface
778 to reduce the memory size of the system. This is accomplished
779 by allocating pages of memory and put them "on hold". This only
780 makes sense for a system running under VM where the unused pages
781 will be reused by VM for other guest systems. The interface
782 allows an external monitor to balance memory of many systems.
783 Everybody who wants to run Linux under VM should select this
788 prompt "IUCV special message interface to cooperative memory management"
789 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
791 Select this option to enable the special message interface to
792 the cooperative memory management.
796 prompt "Linux - VM Monitor Stream, base infrastructure"
799 This provides a kernel interface for creating and updating z/VM APPLDATA
800 monitor records. The monitor records are updated at certain time
801 intervals, once the timer is started.
802 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
803 i.e. enables or disables monitoring on the Linux side.
804 A custom interval value (in seconds) can be written to
805 /proc/appldata/interval.
807 Defaults are 60 seconds interval and timer off.
808 The /proc entries can also be read from, showing the current settings.
812 prompt "Monitor memory management statistics"
813 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
815 This provides memory management related data to the Linux - VM Monitor
816 Stream, like paging/swapping rate, memory utilisation, etc.
817 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
818 APPLDATA monitor record, i.e. enables or disables monitoring this record
822 The /proc entry can also be read from, showing the current settings.
824 This can also be compiled as a module, which will be called
829 prompt "Monitor OS statistics"
830 depends on APPLDATA_BASE
832 This provides OS related data to the Linux - VM Monitor Stream, like
833 CPU utilisation, etc.
834 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
835 APPLDATA monitor record, i.e. enables or disables monitoring this record
839 This can also be compiled as a module, which will be called
842 config APPLDATA_NET_SUM
844 prompt "Monitor overall network statistics"
845 depends on APPLDATA_BASE && NET
847 This provides network related data to the Linux - VM Monitor Stream,
848 currently there is only a total sum of network I/O statistics, no
850 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
851 APPLDATA monitor record, i.e. enables or disables monitoring this record
855 This can also be compiled as a module, which will be called
860 prompt "s390 hypervisor file system support"
861 select SYS_HYPERVISOR
863 This is a virtual file system intended to provide accounting
864 information in an s390 hypervisor environment.
866 source "arch/s390/kvm/Kconfig"
870 prompt "s390 support for virtio devices"
872 select VIRTUALIZATION
874 select VIRTIO_CONSOLE
876 Enabling this option adds support for virtio based paravirtual device
879 Select this option if you want to run the kernel as a guest under
882 config S390_GUEST_OLD_TRANSPORT
884 prompt "Guest support for old s390 virtio transport (DEPRECATED)"
885 depends on S390_GUEST
887 Enable this option to add support for the old s390-virtio
888 transport (i.e. virtio devices NOT based on virtio-ccw). This
889 type of virtio devices is only available on the experimental
890 kuli userspace or with old (< 2.6) qemu. If you are running
891 with a modern version of qemu (which supports virtio-ccw since
892 1.4 and uses it by default since version 2.4), you probably won't