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
367 def_bool y if COMPAT && KEYS
371 prompt "Symmetric multi-processing support"
373 This enables support for systems with more than one CPU. If you have
374 a system with only one CPU, like most personal computers, say N. If
375 you have a system with more than one CPU, say Y.
377 If you say N here, the kernel will run on uni- and multiprocessor
378 machines, but will use only one CPU of a multiprocessor machine. If
379 you say Y here, the kernel will run on many, but not all,
380 uniprocessor machines. On a uniprocessor machine, the kernel
381 will run faster if you say N here.
383 See also the SMP-HOWTO available at
384 <http://www.tldp.org/docs.html#howto>.
386 Even if you don't know what to do here, say Y.
389 int "Maximum number of CPUs (2-512)"
394 This allows you to specify the maximum number of CPUs which this
395 kernel will support. The maximum supported value is 512 and the
396 minimum value which makes sense is 2.
398 This is purely to save memory - each supported CPU adds
399 approximately sixteen kilobytes to the kernel image.
403 prompt "Support for hot-pluggable CPUs"
406 Say Y here to be able to turn CPUs off and on. CPUs
407 can be controlled through /sys/devices/system/cpu/cpu#.
408 Say N if you want to disable CPU hotplug.
410 # Some NUMA nodes have memory ranges that span
411 # other nodes. Even though a pfn is valid and
412 # between a node's start and end pfns, it may not
413 # reside on that node. See memmap_init_zone()
414 # for details. <- They meant memory holes!
415 config NODES_SPAN_OTHER_NODES
420 depends on SMP && SCHED_TOPOLOGY
425 This option adds NUMA support to the kernel.
427 An operation mode can be selected by appending
428 numa=<method> to the kernel command line.
430 The default behaviour is identical to appending numa=plain to
431 the command line. This will create just one node with all
432 available memory and all CPUs in it.
435 int "Maximum NUMA nodes (as a power of 2)"
440 Specify the maximum number of NUMA nodes available on the target
441 system. Increases memory reserved to accommodate various tables.
443 menu "Select NUMA modes"
447 bool "NUMA emulation"
450 Numa emulation mode will split the available system memory into
451 equal chunks which then are distributed over the configured number
452 of nodes in a round-robin manner.
454 The number of fake nodes is limited by the number of available memory
455 chunks (i.e. memory size / fake size) and the number of supported
458 The CPUs are assigned to the nodes in a way that partially respects
459 the original machine topology (if supported by the machine).
460 Fair distribution of the CPUs is not guaranteed.
463 hex "NUMA emulation memory chunk size"
465 range 0x400000 0x100000000
468 Select the default size by which the memory is chopped and then
469 assigned to emulated NUMA nodes.
471 This can be overridden by specifying
475 on the kernel command line where also suffixes K, M, G, and T are
492 config SCHED_TOPOLOGY
494 prompt "Topology scheduler support"
501 Topology scheduler support improves the CPU scheduler's decision
502 making when dealing with machines that have multi-threading,
503 multiple cores or multiple books.
505 source kernel/Kconfig.preempt
507 source kernel/Kconfig.hz
511 prompt "s390 architectural random number generation API"
513 Enable the s390 architectural random number generation API
514 to provide random data for all consumers within the Linux
517 When enabled the arch_random_* functions declared in linux/random.h
518 are implemented. The implementation is based on the s390 CPACF
519 instruction subfunction TRNG which provides a real true random
528 config ARCH_SPARSEMEM_ENABLE
530 select SPARSEMEM_VMEMMAP_ENABLE
531 select SPARSEMEM_VMEMMAP
533 config ARCH_SPARSEMEM_DEFAULT
536 config ARCH_SELECT_MEMORY_MODEL
539 config ARCH_ENABLE_MEMORY_HOTPLUG
540 def_bool y if SPARSEMEM
542 config ARCH_ENABLE_MEMORY_HOTREMOVE
545 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
548 config FORCE_MAX_ZONEORDER
554 config MAX_PHYSMEM_BITS
555 int "Maximum size of supported physical memory in bits (42-53)"
559 This option specifies the maximum supported size of physical memory
560 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
561 Increasing the number of bits also increases the kernel image size.
562 By default 46 bits (64TB) are supported.
566 prompt "Pack kernel stack"
568 This option enables the compiler option -mkernel-backchain if it
569 is available. If the option is available the compiler supports
570 the new stack layout which dramatically reduces the minimum stack
571 frame size. With an old compiler a non-leaf function needs a
572 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
573 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
574 and 24 byte on 64 bit.
576 Say Y if you are unsure.
580 prompt "Detect kernel stack overflow"
582 This option enables the compiler option -mstack-guard and
583 -mstack-size if they are available. If the compiler supports them
584 it will emit additional code to each function prolog to trigger
585 an illegal operation if the kernel stack is about to overflow.
587 Say N if you are unsure.
590 int "Size of the guard area (128-1024)"
592 depends on CHECK_STACK
595 This allows you to specify the size of the guard area at the lower
596 end of the kernel stack. If the kernel stack points into the guard
597 area on function entry an illegal operation is triggered. The size
598 needs to be a power of 2. Please keep in mind that the size of an
599 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
600 The minimum size for the stack guard should be 256 for 31 bit and
603 config WARN_DYNAMIC_STACK
605 prompt "Emit compiler warnings for function with dynamic stack usage"
607 This option enables the compiler option -mwarn-dynamicstack. If the
608 compiler supports this options generates warnings for functions
609 that dynamically allocate stack space using alloca.
611 Say N if you are unsure.
619 prompt "QDIO support"
621 This driver provides the Queued Direct I/O base support for
624 To compile this driver as a module, choose M here: the
625 module will be called qdio.
638 config PCI_NR_FUNCTIONS
639 int "Maximum number of PCI functions (1-4096)"
643 This allows you to specify the maximum number of PCI functions which
644 this kernel will support.
646 source "drivers/pci/Kconfig"
659 config NEED_SG_DMA_LENGTH
662 config NEED_DMA_MAP_STATE
667 prompt "Support for CHSC subchannels"
669 This driver allows usage of CHSC subchannels. A CHSC subchannel
670 is usually present on LPAR only.
671 The driver creates a device /dev/chsc, which may be used to
672 obtain I/O configuration information about the machine and
673 to issue asynchronous chsc commands (DANGEROUS).
674 You will usually only want to use this interface on a special
675 LPAR designated for system management.
677 To compile this driver as a module, choose M here: the
678 module will be called chsc_sch.
684 prompt "SCM bus driver"
686 Bus driver for Storage Class Memory.
690 prompt "Support for EADM subchannels"
693 This driver allows usage of EADM subchannels. EADM subchannels act
694 as a communication vehicle for SCM increments.
696 To compile this driver as a module, choose M here: the
697 module will be called eadm_sch.
701 prompt "Support for VFIO-CCW subchannels"
702 depends on S390_CCW_IOMMU && VFIO_MDEV
704 This driver allows usage of I/O subchannels via VFIO-CCW.
706 To compile this driver as a module, choose M here: the
707 module will be called vfio_ccw.
714 bool "kernel crash dumps"
718 Generate crash dump after being started by kexec.
719 Crash dump kernels are loaded in the main kernel with kexec-tools
720 into a specially reserved region and then later executed after
721 a crash by kdump/kexec.
722 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
723 This option also enables s390 zfcpdump.
724 See also <file:Documentation/s390/zfcpdump.txt>
728 menu "Executable file formats / Emulations"
730 source "fs/Kconfig.binfmt"
734 prompt "Enable seccomp to safely compute untrusted bytecode"
737 This kernel feature is useful for number crunching applications
738 that may need to compute untrusted bytecode during their
739 execution. By using pipes or other transports made available to
740 the process as file descriptors supporting the read/write
741 syscalls, it's possible to isolate those applications in
742 their own address space using seccomp. Once seccomp is
743 enabled via /proc/<pid>/seccomp, it cannot be disabled
744 and the task is only allowed to execute a few safe syscalls
745 defined by each seccomp mode.
751 menu "Power Management"
753 config ARCH_HIBERNATION_POSSIBLE
756 source "kernel/power/Kconfig"
768 source "drivers/Kconfig"
772 source "arch/s390/Kconfig.debug"
774 source "security/Kconfig"
776 source "crypto/Kconfig"
780 menu "Virtualization"
784 prompt "Pseudo page fault support"
786 Select this option, if you want to use PFAULT pseudo page fault
787 handling under VM. If running native or in LPAR, this option
788 has no effect. If your VM does not support PFAULT, PAGEEX
789 pseudo page fault handling will be used.
790 Note that VM 4.2 supports PFAULT but has a bug in its
791 implementation that causes some problems.
792 Everybody who wants to run Linux under VM != VM4.2 should select
796 bool "VM shared kernel support"
797 depends on !JUMP_LABEL
799 Select this option, if you want to share the text segment of the
800 Linux kernel between different VM guests. This reduces memory
801 usage with lots of guests but greatly increases kernel size.
802 Also if a kernel was IPL'ed from a shared segment the kexec system
804 You should only select this option if you know what you are
805 doing and want to exploit this feature.
809 prompt "Cooperative memory management"
811 Select this option, if you want to enable the kernel interface
812 to reduce the memory size of the system. This is accomplished
813 by allocating pages of memory and put them "on hold". This only
814 makes sense for a system running under VM where the unused pages
815 will be reused by VM for other guest systems. The interface
816 allows an external monitor to balance memory of many systems.
817 Everybody who wants to run Linux under VM should select this
822 prompt "IUCV special message interface to cooperative memory management"
823 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
825 Select this option to enable the special message interface to
826 the cooperative memory management.
830 prompt "Linux - VM Monitor Stream, base infrastructure"
833 This provides a kernel interface for creating and updating z/VM APPLDATA
834 monitor records. The monitor records are updated at certain time
835 intervals, once the timer is started.
836 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
837 i.e. enables or disables monitoring on the Linux side.
838 A custom interval value (in seconds) can be written to
839 /proc/appldata/interval.
841 Defaults are 60 seconds interval and timer off.
842 The /proc entries can also be read from, showing the current settings.
846 prompt "Monitor memory management statistics"
847 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
849 This provides memory management related data to the Linux - VM Monitor
850 Stream, like paging/swapping rate, memory utilisation, etc.
851 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
852 APPLDATA monitor record, i.e. enables or disables monitoring this record
856 The /proc entry can also be read from, showing the current settings.
858 This can also be compiled as a module, which will be called
863 prompt "Monitor OS statistics"
864 depends on APPLDATA_BASE
866 This provides OS related data to the Linux - VM Monitor Stream, like
867 CPU utilisation, etc.
868 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
869 APPLDATA monitor record, i.e. enables or disables monitoring this record
873 This can also be compiled as a module, which will be called
876 config APPLDATA_NET_SUM
878 prompt "Monitor overall network statistics"
879 depends on APPLDATA_BASE && NET
881 This provides network related data to the Linux - VM Monitor Stream,
882 currently there is only a total sum of network I/O statistics, no
884 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
885 APPLDATA monitor record, i.e. enables or disables monitoring this record
889 This can also be compiled as a module, which will be called
894 prompt "s390 hypervisor file system support"
895 select SYS_HYPERVISOR
897 This is a virtual file system intended to provide accounting
898 information in an s390 hypervisor environment.
900 source "arch/s390/kvm/Kconfig"
904 prompt "s390 support for virtio devices"
906 select VIRTUALIZATION
908 select VIRTIO_CONSOLE
910 Enabling this option adds support for virtio based paravirtual device
913 Select this option if you want to run the kernel as a guest under
916 config S390_GUEST_OLD_TRANSPORT
918 prompt "Guest support for old s390 virtio transport (DEPRECATED)"
919 depends on S390_GUEST
921 Enable this option to add support for the old s390-virtio
922 transport (i.e. virtio devices NOT based on virtio-ccw). This
923 type of virtio devices is only available on the experimental
924 kuli userspace or with old (< 2.6) qemu. If you are running
925 with a modern version of qemu (which supports virtio-ccw since
926 1.4 and uses it by default since version 2.4), you probably won't