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
181 select ARCH_HAS_RAW_COPY_USER
184 config SCHED_OMIT_FRAME_POINTER
187 config PGTABLE_LEVELS
191 source "init/Kconfig"
193 source "kernel/Kconfig.freezer"
195 source "kernel/livepatch/Kconfig"
197 menu "Processor type and features"
199 config HAVE_MARCH_Z900_FEATURES
202 config HAVE_MARCH_Z990_FEATURES
204 select HAVE_MARCH_Z900_FEATURES
206 config HAVE_MARCH_Z9_109_FEATURES
208 select HAVE_MARCH_Z990_FEATURES
210 config HAVE_MARCH_Z10_FEATURES
212 select HAVE_MARCH_Z9_109_FEATURES
214 config HAVE_MARCH_Z196_FEATURES
216 select HAVE_MARCH_Z10_FEATURES
218 config HAVE_MARCH_ZEC12_FEATURES
220 select HAVE_MARCH_Z196_FEATURES
222 config HAVE_MARCH_Z13_FEATURES
224 select HAVE_MARCH_ZEC12_FEATURES
227 prompt "Processor type"
231 bool "IBM zSeries model z800 and z900"
232 select HAVE_MARCH_Z900_FEATURES
234 Select this to enable optimizations for model z800/z900 (2064 and
235 2066 series). This will enable some optimizations that are not
236 available on older ESA/390 (31 Bit) only CPUs.
239 bool "IBM zSeries model z890 and z990"
240 select HAVE_MARCH_Z990_FEATURES
242 Select this to enable optimizations for model z890/z990 (2084 and
243 2086 series). The kernel will be slightly faster but will not work
248 select HAVE_MARCH_Z9_109_FEATURES
250 Select this to enable optimizations for IBM System z9 (2094 and
251 2096 series). The kernel will be slightly faster but will not work
255 bool "IBM System z10"
256 select HAVE_MARCH_Z10_FEATURES
258 Select this to enable optimizations for IBM System z10 (2097 and
259 2098 series). The kernel will be slightly faster but will not work
263 bool "IBM zEnterprise 114 and 196"
264 select HAVE_MARCH_Z196_FEATURES
266 Select this to enable optimizations for IBM zEnterprise 114 and 196
267 (2818 and 2817 series). The kernel will be slightly faster but will
268 not work on older machines.
271 bool "IBM zBC12 and zEC12"
272 select HAVE_MARCH_ZEC12_FEATURES
274 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
275 2827 series). The kernel will be slightly faster but will not work on
279 bool "IBM z13s and z13"
280 select HAVE_MARCH_Z13_FEATURES
282 Select this to enable optimizations for IBM z13s and z13 (2965 and
283 2964 series). The kernel will be slightly faster but will not work on
288 config MARCH_Z900_TUNE
289 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
291 config MARCH_Z990_TUNE
292 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
294 config MARCH_Z9_109_TUNE
295 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
297 config MARCH_Z10_TUNE
298 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
300 config MARCH_Z196_TUNE
301 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
303 config MARCH_ZEC12_TUNE
304 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
306 config MARCH_Z13_TUNE
307 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
310 prompt "Tune code generation"
313 Cause the compiler to tune (-mtune) the generated code for a machine.
314 This will make the code run faster on the selected machine but
315 somewhat slower on other machines.
316 This option only changes how the compiler emits instructions, not the
317 selection of instructions itself, so the resulting kernel will run on
323 Tune the generated code for the target processor for which the kernel
327 bool "IBM zSeries model z800 and z900"
330 bool "IBM zSeries model z890 and z990"
336 bool "IBM System z10"
339 bool "IBM zEnterprise 114 and 196"
342 bool "IBM zBC12 and zEC12"
354 prompt "Kernel support for 31 bit emulation"
355 select COMPAT_BINFMT_ELF if BINFMT_ELF
356 select ARCH_WANT_OLD_COMPAT_IPC
357 select COMPAT_OLD_SIGACTION
360 Select this option if you want to enable your system kernel to
361 handle system-calls from ELF binaries for 31 bit ESA. This option
362 (and some other stuff like libraries and such) is needed for
363 executing 31 bit applications. It is safe to say "Y".
365 config SYSVIPC_COMPAT
366 def_bool y if COMPAT && SYSVIPC
369 def_bool y if COMPAT && KEYS
373 prompt "Symmetric multi-processing support"
375 This enables support for systems with more than one CPU. If you have
376 a system with only one CPU, like most personal computers, say N. If
377 you have a system with more than one CPU, say Y.
379 If you say N here, the kernel will run on uni- and multiprocessor
380 machines, but will use only one CPU of a multiprocessor machine. If
381 you say Y here, the kernel will run on many, but not all,
382 uniprocessor machines. On a uniprocessor machine, the kernel
383 will run faster if you say N here.
385 See also the SMP-HOWTO available at
386 <http://www.tldp.org/docs.html#howto>.
388 Even if you don't know what to do here, say Y.
391 int "Maximum number of CPUs (2-512)"
396 This allows you to specify the maximum number of CPUs which this
397 kernel will support. The maximum supported value is 512 and the
398 minimum value which makes sense is 2.
400 This is purely to save memory - each supported CPU adds
401 approximately sixteen kilobytes to the kernel image.
405 prompt "Support for hot-pluggable CPUs"
408 Say Y here to be able to turn CPUs off and on. CPUs
409 can be controlled through /sys/devices/system/cpu/cpu#.
410 Say N if you want to disable CPU hotplug.
412 # Some NUMA nodes have memory ranges that span
413 # other nodes. Even though a pfn is valid and
414 # between a node's start and end pfns, it may not
415 # reside on that node. See memmap_init_zone()
416 # for details. <- They meant memory holes!
417 config NODES_SPAN_OTHER_NODES
422 depends on SMP && SCHED_TOPOLOGY
427 This option adds NUMA support to the kernel.
429 An operation mode can be selected by appending
430 numa=<method> to the kernel command line.
432 The default behaviour is identical to appending numa=plain to
433 the command line. This will create just one node with all
434 available memory and all CPUs in it.
437 int "Maximum NUMA nodes (as a power of 2)"
442 Specify the maximum number of NUMA nodes available on the target
443 system. Increases memory reserved to accommodate various tables.
445 menu "Select NUMA modes"
449 bool "NUMA emulation"
452 Numa emulation mode will split the available system memory into
453 equal chunks which then are distributed over the configured number
454 of nodes in a round-robin manner.
456 The number of fake nodes is limited by the number of available memory
457 chunks (i.e. memory size / fake size) and the number of supported
460 The CPUs are assigned to the nodes in a way that partially respects
461 the original machine topology (if supported by the machine).
462 Fair distribution of the CPUs is not guaranteed.
465 hex "NUMA emulation memory chunk size"
467 range 0x400000 0x100000000
470 Select the default size by which the memory is chopped and then
471 assigned to emulated NUMA nodes.
473 This can be overridden by specifying
477 on the kernel command line where also suffixes K, M, G, and T are
494 config SCHED_TOPOLOGY
496 prompt "Topology scheduler support"
503 Topology scheduler support improves the CPU scheduler's decision
504 making when dealing with machines that have multi-threading,
505 multiple cores or multiple books.
507 source kernel/Kconfig.preempt
509 source kernel/Kconfig.hz
515 config ARCH_SPARSEMEM_ENABLE
517 select SPARSEMEM_VMEMMAP_ENABLE
518 select SPARSEMEM_VMEMMAP
520 config ARCH_SPARSEMEM_DEFAULT
523 config ARCH_SELECT_MEMORY_MODEL
526 config ARCH_ENABLE_MEMORY_HOTPLUG
527 def_bool y if SPARSEMEM
529 config ARCH_ENABLE_MEMORY_HOTREMOVE
532 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
535 config FORCE_MAX_ZONEORDER
543 prompt "Pack kernel stack"
545 This option enables the compiler option -mkernel-backchain if it
546 is available. If the option is available the compiler supports
547 the new stack layout which dramatically reduces the minimum stack
548 frame size. With an old compiler a non-leaf function needs a
549 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
550 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
551 and 24 byte on 64 bit.
553 Say Y if you are unsure.
557 prompt "Detect kernel stack overflow"
559 This option enables the compiler option -mstack-guard and
560 -mstack-size if they are available. If the compiler supports them
561 it will emit additional code to each function prolog to trigger
562 an illegal operation if the kernel stack is about to overflow.
564 Say N if you are unsure.
567 int "Size of the guard area (128-1024)"
569 depends on CHECK_STACK
572 This allows you to specify the size of the guard area at the lower
573 end of the kernel stack. If the kernel stack points into the guard
574 area on function entry an illegal operation is triggered. The size
575 needs to be a power of 2. Please keep in mind that the size of an
576 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
577 The minimum size for the stack guard should be 256 for 31 bit and
580 config WARN_DYNAMIC_STACK
582 prompt "Emit compiler warnings for function with dynamic stack usage"
584 This option enables the compiler option -mwarn-dynamicstack. If the
585 compiler supports this options generates warnings for functions
586 that dynamically allocate stack space using alloca.
588 Say N if you are unsure.
596 prompt "QDIO support"
598 This driver provides the Queued Direct I/O base support for
601 To compile this driver as a module, choose M here: the
602 module will be called qdio.
615 config PCI_NR_FUNCTIONS
616 int "Maximum number of PCI functions (1-4096)"
620 This allows you to specify the maximum number of PCI functions which
621 this kernel will support.
623 source "drivers/pci/Kconfig"
636 config NEED_SG_DMA_LENGTH
639 config NEED_DMA_MAP_STATE
644 prompt "Support for CHSC subchannels"
646 This driver allows usage of CHSC subchannels. A CHSC subchannel
647 is usually present on LPAR only.
648 The driver creates a device /dev/chsc, which may be used to
649 obtain I/O configuration information about the machine and
650 to issue asynchronous chsc commands (DANGEROUS).
651 You will usually only want to use this interface on a special
652 LPAR designated for system management.
654 To compile this driver as a module, choose M here: the
655 module will be called chsc_sch.
661 prompt "SCM bus driver"
663 Bus driver for Storage Class Memory.
667 prompt "Support for EADM subchannels"
670 This driver allows usage of EADM subchannels. EADM subchannels act
671 as a communication vehicle for SCM increments.
673 To compile this driver as a module, choose M here: the
674 module will be called eadm_sch.
681 bool "kernel crash dumps"
685 Generate crash dump after being started by kexec.
686 Crash dump kernels are loaded in the main kernel with kexec-tools
687 into a specially reserved region and then later executed after
688 a crash by kdump/kexec.
689 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
690 This option also enables s390 zfcpdump.
691 See also <file:Documentation/s390/zfcpdump.txt>
695 menu "Executable file formats / Emulations"
697 source "fs/Kconfig.binfmt"
701 prompt "Enable seccomp to safely compute untrusted bytecode"
704 This kernel feature is useful for number crunching applications
705 that may need to compute untrusted bytecode during their
706 execution. By using pipes or other transports made available to
707 the process as file descriptors supporting the read/write
708 syscalls, it's possible to isolate those applications in
709 their own address space using seccomp. Once seccomp is
710 enabled via /proc/<pid>/seccomp, it cannot be disabled
711 and the task is only allowed to execute a few safe syscalls
712 defined by each seccomp mode.
718 menu "Power Management"
720 config ARCH_HIBERNATION_POSSIBLE
723 source "kernel/power/Kconfig"
735 source "drivers/Kconfig"
739 source "arch/s390/Kconfig.debug"
741 source "security/Kconfig"
743 source "crypto/Kconfig"
747 menu "Virtualization"
751 prompt "Pseudo page fault support"
753 Select this option, if you want to use PFAULT pseudo page fault
754 handling under VM. If running native or in LPAR, this option
755 has no effect. If your VM does not support PFAULT, PAGEEX
756 pseudo page fault handling will be used.
757 Note that VM 4.2 supports PFAULT but has a bug in its
758 implementation that causes some problems.
759 Everybody who wants to run Linux under VM != VM4.2 should select
763 bool "VM shared kernel support"
764 depends on !JUMP_LABEL
766 Select this option, if you want to share the text segment of the
767 Linux kernel between different VM guests. This reduces memory
768 usage with lots of guests but greatly increases kernel size.
769 Also if a kernel was IPL'ed from a shared segment the kexec system
771 You should only select this option if you know what you are
772 doing and want to exploit this feature.
776 prompt "Cooperative memory management"
778 Select this option, if you want to enable the kernel interface
779 to reduce the memory size of the system. This is accomplished
780 by allocating pages of memory and put them "on hold". This only
781 makes sense for a system running under VM where the unused pages
782 will be reused by VM for other guest systems. The interface
783 allows an external monitor to balance memory of many systems.
784 Everybody who wants to run Linux under VM should select this
789 prompt "IUCV special message interface to cooperative memory management"
790 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
792 Select this option to enable the special message interface to
793 the cooperative memory management.
797 prompt "Linux - VM Monitor Stream, base infrastructure"
800 This provides a kernel interface for creating and updating z/VM APPLDATA
801 monitor records. The monitor records are updated at certain time
802 intervals, once the timer is started.
803 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
804 i.e. enables or disables monitoring on the Linux side.
805 A custom interval value (in seconds) can be written to
806 /proc/appldata/interval.
808 Defaults are 60 seconds interval and timer off.
809 The /proc entries can also be read from, showing the current settings.
813 prompt "Monitor memory management statistics"
814 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
816 This provides memory management related data to the Linux - VM Monitor
817 Stream, like paging/swapping rate, memory utilisation, etc.
818 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
819 APPLDATA monitor record, i.e. enables or disables monitoring this record
823 The /proc entry can also be read from, showing the current settings.
825 This can also be compiled as a module, which will be called
830 prompt "Monitor OS statistics"
831 depends on APPLDATA_BASE
833 This provides OS related data to the Linux - VM Monitor Stream, like
834 CPU utilisation, etc.
835 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
836 APPLDATA monitor record, i.e. enables or disables monitoring this record
840 This can also be compiled as a module, which will be called
843 config APPLDATA_NET_SUM
845 prompt "Monitor overall network statistics"
846 depends on APPLDATA_BASE && NET
848 This provides network related data to the Linux - VM Monitor Stream,
849 currently there is only a total sum of network I/O statistics, no
851 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
852 APPLDATA monitor record, i.e. enables or disables monitoring this record
856 This can also be compiled as a module, which will be called
861 prompt "s390 hypervisor file system support"
862 select SYS_HYPERVISOR
864 This is a virtual file system intended to provide accounting
865 information in an s390 hypervisor environment.
867 source "arch/s390/kvm/Kconfig"
871 prompt "s390 support for virtio devices"
873 select VIRTUALIZATION
875 select VIRTIO_CONSOLE
877 Enabling this option adds support for virtio based paravirtual device
880 Select this option if you want to run the kernel as a guest under
883 config S390_GUEST_OLD_TRANSPORT
885 prompt "Guest support for old s390 virtio transport (DEPRECATED)"
886 depends on S390_GUEST
888 Enable this option to add support for the old s390-virtio
889 transport (i.e. virtio devices NOT based on virtio-ccw). This
890 type of virtio devices is only available on the experimental
891 kuli userspace or with old (< 2.6) qemu. If you are running
892 with a modern version of qemu (which supports virtio-ccw since
893 1.4 and uses it by default since version 2.4), you probably won't