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_DEFERRED_STRUCT_PAGE_INIT
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_JUMP_LABEL
128 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
129 select HAVE_ARCH_SECCOMP_FILTER
130 select HAVE_ARCH_SOFT_DIRTY
131 select HAVE_ARCH_TRACEHOOK
132 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
133 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
134 select HAVE_CMPXCHG_DOUBLE
135 select HAVE_CMPXCHG_LOCAL
136 select HAVE_COPY_THREAD_TLS
137 select HAVE_DEBUG_KMEMLEAK
138 select HAVE_DMA_API_DEBUG
139 select HAVE_DMA_CONTIGUOUS
141 select HAVE_DYNAMIC_FTRACE
142 select HAVE_DYNAMIC_FTRACE_WITH_REGS
143 select HAVE_EFFICIENT_UNALIGNED_ACCESS
144 select HAVE_EXIT_THREAD
145 select HAVE_FTRACE_MCOUNT_RECORD
146 select HAVE_FUNCTION_GRAPH_TRACER
147 select HAVE_FUNCTION_TRACER
148 select HAVE_FUTEX_CMPXCHG if FUTEX
149 select HAVE_KERNEL_BZIP2
150 select HAVE_KERNEL_GZIP
151 select HAVE_KERNEL_LZ4
152 select HAVE_KERNEL_LZMA
153 select HAVE_KERNEL_LZO
154 select HAVE_KERNEL_XZ
156 select HAVE_KRETPROBES
158 select HAVE_LIVEPATCH
160 select HAVE_MEMBLOCK_NODE_MAP
161 select HAVE_MEMBLOCK_PHYS_MAP
162 select HAVE_MOD_ARCH_SPECIFIC
164 select HAVE_PERF_EVENTS
165 select HAVE_REGS_AND_STACK_ACCESS_API
166 select HAVE_SYSCALL_TRACEPOINTS
167 select HAVE_VIRT_CPU_ACCOUNTING
168 select MODULES_USE_ELF_RELA
171 select OLD_SIGSUSPEND3
173 select SYSCTL_EXCEPTION_TRACE
174 select THREAD_INFO_IN_TASK
176 select VIRT_CPU_ACCOUNTING
177 select ARCH_HAS_SCALED_CPUTIME
182 config SCHED_OMIT_FRAME_POINTER
185 config PGTABLE_LEVELS
189 source "init/Kconfig"
191 source "kernel/Kconfig.freezer"
193 source "kernel/livepatch/Kconfig"
195 menu "Processor type and features"
197 config HAVE_MARCH_Z900_FEATURES
200 config HAVE_MARCH_Z990_FEATURES
202 select HAVE_MARCH_Z900_FEATURES
204 config HAVE_MARCH_Z9_109_FEATURES
206 select HAVE_MARCH_Z990_FEATURES
208 config HAVE_MARCH_Z10_FEATURES
210 select HAVE_MARCH_Z9_109_FEATURES
212 config HAVE_MARCH_Z196_FEATURES
214 select HAVE_MARCH_Z10_FEATURES
216 config HAVE_MARCH_ZEC12_FEATURES
218 select HAVE_MARCH_Z196_FEATURES
220 config HAVE_MARCH_Z13_FEATURES
222 select HAVE_MARCH_ZEC12_FEATURES
225 prompt "Processor type"
229 bool "IBM zSeries model z800 and z900"
230 select HAVE_MARCH_Z900_FEATURES
232 Select this to enable optimizations for model z800/z900 (2064 and
233 2066 series). This will enable some optimizations that are not
234 available on older ESA/390 (31 Bit) only CPUs.
237 bool "IBM zSeries model z890 and z990"
238 select HAVE_MARCH_Z990_FEATURES
240 Select this to enable optimizations for model z890/z990 (2084 and
241 2086 series). The kernel will be slightly faster but will not work
246 select HAVE_MARCH_Z9_109_FEATURES
248 Select this to enable optimizations for IBM System z9 (2094 and
249 2096 series). The kernel will be slightly faster but will not work
253 bool "IBM System z10"
254 select HAVE_MARCH_Z10_FEATURES
256 Select this to enable optimizations for IBM System z10 (2097 and
257 2098 series). The kernel will be slightly faster but will not work
261 bool "IBM zEnterprise 114 and 196"
262 select HAVE_MARCH_Z196_FEATURES
264 Select this to enable optimizations for IBM zEnterprise 114 and 196
265 (2818 and 2817 series). The kernel will be slightly faster but will
266 not work on older machines.
269 bool "IBM zBC12 and zEC12"
270 select HAVE_MARCH_ZEC12_FEATURES
272 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
273 2827 series). The kernel will be slightly faster but will not work on
277 bool "IBM z13s and z13"
278 select HAVE_MARCH_Z13_FEATURES
280 Select this to enable optimizations for IBM z13s and z13 (2965 and
281 2964 series). The kernel will be slightly faster but will not work on
286 config MARCH_Z900_TUNE
287 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
289 config MARCH_Z990_TUNE
290 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
292 config MARCH_Z9_109_TUNE
293 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
295 config MARCH_Z10_TUNE
296 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
298 config MARCH_Z196_TUNE
299 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
301 config MARCH_ZEC12_TUNE
302 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
304 config MARCH_Z13_TUNE
305 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
308 prompt "Tune code generation"
311 Cause the compiler to tune (-mtune) the generated code for a machine.
312 This will make the code run faster on the selected machine but
313 somewhat slower on other machines.
314 This option only changes how the compiler emits instructions, not the
315 selection of instructions itself, so the resulting kernel will run on
321 Tune the generated code for the target processor for which the kernel
325 bool "IBM zSeries model z800 and z900"
328 bool "IBM zSeries model z890 and z990"
334 bool "IBM System z10"
337 bool "IBM zEnterprise 114 and 196"
340 bool "IBM zBC12 and zEC12"
352 prompt "Kernel support for 31 bit emulation"
353 select COMPAT_BINFMT_ELF if BINFMT_ELF
354 select ARCH_WANT_OLD_COMPAT_IPC
355 select COMPAT_OLD_SIGACTION
358 Select this option if you want to enable your system kernel to
359 handle system-calls from ELF binaries for 31 bit ESA. This option
360 (and some other stuff like libraries and such) is needed for
361 executing 31 bit applications. It is safe to say "Y".
363 config SYSVIPC_COMPAT
364 def_bool y if COMPAT && SYSVIPC
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
508 prompt "s390 architectural random number generation API"
510 Enable the s390 architectural random number generation API
511 to provide random data for all consumers within the Linux
514 When enabled the arch_random_* functions declared in linux/random.h
515 are implemented. The implementation is based on the s390 CPACF
516 instruction subfunction TRNG which provides a real true random
525 config ARCH_SPARSEMEM_ENABLE
527 select SPARSEMEM_VMEMMAP_ENABLE
528 select SPARSEMEM_VMEMMAP
530 config ARCH_SPARSEMEM_DEFAULT
533 config ARCH_SELECT_MEMORY_MODEL
536 config ARCH_ENABLE_MEMORY_HOTPLUG
537 def_bool y if SPARSEMEM
539 config ARCH_ENABLE_MEMORY_HOTREMOVE
542 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
545 config FORCE_MAX_ZONEORDER
551 config MAX_PHYSMEM_BITS
552 int "Maximum size of supported physical memory in bits (42-53)"
556 This option specifies the maximum supported size of physical memory
557 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
558 Increasing the number of bits also increases the kernel image size.
559 By default 46 bits (64TB) are supported.
563 prompt "Pack kernel stack"
565 This option enables the compiler option -mkernel-backchain if it
566 is available. If the option is available the compiler supports
567 the new stack layout which dramatically reduces the minimum stack
568 frame size. With an old compiler a non-leaf function needs a
569 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
570 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
571 and 24 byte on 64 bit.
573 Say Y if you are unsure.
577 prompt "Detect kernel stack overflow"
579 This option enables the compiler option -mstack-guard and
580 -mstack-size if they are available. If the compiler supports them
581 it will emit additional code to each function prolog to trigger
582 an illegal operation if the kernel stack is about to overflow.
584 Say N if you are unsure.
587 int "Size of the guard area (128-1024)"
589 depends on CHECK_STACK
592 This allows you to specify the size of the guard area at the lower
593 end of the kernel stack. If the kernel stack points into the guard
594 area on function entry an illegal operation is triggered. The size
595 needs to be a power of 2. Please keep in mind that the size of an
596 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
597 The minimum size for the stack guard should be 256 for 31 bit and
600 config WARN_DYNAMIC_STACK
602 prompt "Emit compiler warnings for function with dynamic stack usage"
604 This option enables the compiler option -mwarn-dynamicstack. If the
605 compiler supports this options generates warnings for functions
606 that dynamically allocate stack space using alloca.
608 Say N if you are unsure.
616 prompt "QDIO support"
618 This driver provides the Queued Direct I/O base support for
621 To compile this driver as a module, choose M here: the
622 module will be called qdio.
635 config PCI_NR_FUNCTIONS
636 int "Maximum number of PCI functions (1-4096)"
640 This allows you to specify the maximum number of PCI functions which
641 this kernel will support.
643 source "drivers/pci/Kconfig"
656 config NEED_SG_DMA_LENGTH
659 config NEED_DMA_MAP_STATE
664 prompt "Support for CHSC subchannels"
666 This driver allows usage of CHSC subchannels. A CHSC subchannel
667 is usually present on LPAR only.
668 The driver creates a device /dev/chsc, which may be used to
669 obtain I/O configuration information about the machine and
670 to issue asynchronous chsc commands (DANGEROUS).
671 You will usually only want to use this interface on a special
672 LPAR designated for system management.
674 To compile this driver as a module, choose M here: the
675 module will be called chsc_sch.
681 prompt "SCM bus driver"
683 Bus driver for Storage Class Memory.
687 prompt "Support for EADM subchannels"
690 This driver allows usage of EADM subchannels. EADM subchannels act
691 as a communication vehicle for SCM increments.
693 To compile this driver as a module, choose M here: the
694 module will be called eadm_sch.
698 prompt "Support for VFIO-CCW subchannels"
699 depends on S390_CCW_IOMMU && VFIO_MDEV
701 This driver allows usage of I/O subchannels via VFIO-CCW.
703 To compile this driver as a module, choose M here: the
704 module will be called vfio_ccw.
711 bool "kernel crash dumps"
715 Generate crash dump after being started by kexec.
716 Crash dump kernels are loaded in the main kernel with kexec-tools
717 into a specially reserved region and then later executed after
718 a crash by kdump/kexec.
719 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
720 This option also enables s390 zfcpdump.
721 See also <file:Documentation/s390/zfcpdump.txt>
725 menu "Executable file formats / Emulations"
727 source "fs/Kconfig.binfmt"
731 prompt "Enable seccomp to safely compute untrusted bytecode"
734 This kernel feature is useful for number crunching applications
735 that may need to compute untrusted bytecode during their
736 execution. By using pipes or other transports made available to
737 the process as file descriptors supporting the read/write
738 syscalls, it's possible to isolate those applications in
739 their own address space using seccomp. Once seccomp is
740 enabled via /proc/<pid>/seccomp, it cannot be disabled
741 and the task is only allowed to execute a few safe syscalls
742 defined by each seccomp mode.
748 menu "Power Management"
750 config ARCH_HIBERNATION_POSSIBLE
753 source "kernel/power/Kconfig"
765 source "drivers/Kconfig"
769 source "arch/s390/Kconfig.debug"
771 source "security/Kconfig"
773 source "crypto/Kconfig"
777 menu "Virtualization"
781 prompt "Pseudo page fault support"
783 Select this option, if you want to use PFAULT pseudo page fault
784 handling under VM. If running native or in LPAR, this option
785 has no effect. If your VM does not support PFAULT, PAGEEX
786 pseudo page fault handling will be used.
787 Note that VM 4.2 supports PFAULT but has a bug in its
788 implementation that causes some problems.
789 Everybody who wants to run Linux under VM != VM4.2 should select
793 bool "VM shared kernel support"
794 depends on !JUMP_LABEL
796 Select this option, if you want to share the text segment of the
797 Linux kernel between different VM guests. This reduces memory
798 usage with lots of guests but greatly increases kernel size.
799 Also if a kernel was IPL'ed from a shared segment the kexec system
801 You should only select this option if you know what you are
802 doing and want to exploit this feature.
806 prompt "Cooperative memory management"
808 Select this option, if you want to enable the kernel interface
809 to reduce the memory size of the system. This is accomplished
810 by allocating pages of memory and put them "on hold". This only
811 makes sense for a system running under VM where the unused pages
812 will be reused by VM for other guest systems. The interface
813 allows an external monitor to balance memory of many systems.
814 Everybody who wants to run Linux under VM should select this
819 prompt "IUCV special message interface to cooperative memory management"
820 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
822 Select this option to enable the special message interface to
823 the cooperative memory management.
827 prompt "Linux - VM Monitor Stream, base infrastructure"
830 This provides a kernel interface for creating and updating z/VM APPLDATA
831 monitor records. The monitor records are updated at certain time
832 intervals, once the timer is started.
833 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
834 i.e. enables or disables monitoring on the Linux side.
835 A custom interval value (in seconds) can be written to
836 /proc/appldata/interval.
838 Defaults are 60 seconds interval and timer off.
839 The /proc entries can also be read from, showing the current settings.
843 prompt "Monitor memory management statistics"
844 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
846 This provides memory management related data to the Linux - VM Monitor
847 Stream, like paging/swapping rate, memory utilisation, etc.
848 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
849 APPLDATA monitor record, i.e. enables or disables monitoring this record
853 The /proc entry can also be read from, showing the current settings.
855 This can also be compiled as a module, which will be called
860 prompt "Monitor OS statistics"
861 depends on APPLDATA_BASE
863 This provides OS related data to the Linux - VM Monitor Stream, like
864 CPU utilisation, etc.
865 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
866 APPLDATA monitor record, i.e. enables or disables monitoring this record
870 This can also be compiled as a module, which will be called
873 config APPLDATA_NET_SUM
875 prompt "Monitor overall network statistics"
876 depends on APPLDATA_BASE && NET
878 This provides network related data to the Linux - VM Monitor Stream,
879 currently there is only a total sum of network I/O statistics, no
881 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
882 APPLDATA monitor record, i.e. enables or disables monitoring this record
886 This can also be compiled as a module, which will be called
891 prompt "s390 hypervisor file system support"
892 select SYS_HYPERVISOR
894 This is a virtual file system intended to provide accounting
895 information in an s390 hypervisor environment.
897 source "arch/s390/kvm/Kconfig"
901 prompt "s390 support for virtio devices"
903 select VIRTUALIZATION
905 select VIRTIO_CONSOLE
907 Enabling this option adds support for virtio based paravirtual device
910 Select this option if you want to run the kernel as a guest under
913 config S390_GUEST_OLD_TRANSPORT
915 prompt "Guest support for old s390 virtio transport (DEPRECATED)"
916 depends on S390_GUEST
918 Enable this option to add support for the old s390-virtio
919 transport (i.e. virtio devices NOT based on virtio-ccw). This
920 type of virtio devices is only available on the experimental
921 kuli userspace or with old (< 2.6) qemu. If you are running
922 with a modern version of qemu (which supports virtio-ccw since
923 1.4 and uses it by default since version 2.4), you probably won't