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_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
513 config ARCH_SPARSEMEM_ENABLE
515 select SPARSEMEM_VMEMMAP_ENABLE
516 select SPARSEMEM_VMEMMAP
518 config ARCH_SPARSEMEM_DEFAULT
521 config ARCH_SELECT_MEMORY_MODEL
524 config ARCH_ENABLE_MEMORY_HOTPLUG
525 def_bool y if SPARSEMEM
527 config ARCH_ENABLE_MEMORY_HOTREMOVE
530 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
533 config FORCE_MAX_ZONEORDER
541 prompt "Pack kernel stack"
543 This option enables the compiler option -mkernel-backchain if it
544 is available. If the option is available the compiler supports
545 the new stack layout which dramatically reduces the minimum stack
546 frame size. With an old compiler a non-leaf function needs a
547 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
548 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
549 and 24 byte on 64 bit.
551 Say Y if you are unsure.
555 prompt "Detect kernel stack overflow"
557 This option enables the compiler option -mstack-guard and
558 -mstack-size if they are available. If the compiler supports them
559 it will emit additional code to each function prolog to trigger
560 an illegal operation if the kernel stack is about to overflow.
562 Say N if you are unsure.
565 int "Size of the guard area (128-1024)"
567 depends on CHECK_STACK
570 This allows you to specify the size of the guard area at the lower
571 end of the kernel stack. If the kernel stack points into the guard
572 area on function entry an illegal operation is triggered. The size
573 needs to be a power of 2. Please keep in mind that the size of an
574 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
575 The minimum size for the stack guard should be 256 for 31 bit and
578 config WARN_DYNAMIC_STACK
580 prompt "Emit compiler warnings for function with dynamic stack usage"
582 This option enables the compiler option -mwarn-dynamicstack. If the
583 compiler supports this options generates warnings for functions
584 that dynamically allocate stack space using alloca.
586 Say N if you are unsure.
594 prompt "QDIO support"
596 This driver provides the Queued Direct I/O base support for
599 To compile this driver as a module, choose M here: the
600 module will be called qdio.
613 config PCI_NR_FUNCTIONS
614 int "Maximum number of PCI functions (1-4096)"
618 This allows you to specify the maximum number of PCI functions which
619 this kernel will support.
621 source "drivers/pci/Kconfig"
634 config NEED_SG_DMA_LENGTH
637 config NEED_DMA_MAP_STATE
642 prompt "Support for CHSC subchannels"
644 This driver allows usage of CHSC subchannels. A CHSC subchannel
645 is usually present on LPAR only.
646 The driver creates a device /dev/chsc, which may be used to
647 obtain I/O configuration information about the machine and
648 to issue asynchronous chsc commands (DANGEROUS).
649 You will usually only want to use this interface on a special
650 LPAR designated for system management.
652 To compile this driver as a module, choose M here: the
653 module will be called chsc_sch.
659 prompt "SCM bus driver"
661 Bus driver for Storage Class Memory.
665 prompt "Support for EADM subchannels"
668 This driver allows usage of EADM subchannels. EADM subchannels act
669 as a communication vehicle for SCM increments.
671 To compile this driver as a module, choose M here: the
672 module will be called eadm_sch.
679 bool "kernel crash dumps"
683 Generate crash dump after being started by kexec.
684 Crash dump kernels are loaded in the main kernel with kexec-tools
685 into a specially reserved region and then later executed after
686 a crash by kdump/kexec.
687 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
688 This option also enables s390 zfcpdump.
689 See also <file:Documentation/s390/zfcpdump.txt>
693 menu "Executable file formats / Emulations"
695 source "fs/Kconfig.binfmt"
699 prompt "Enable seccomp to safely compute untrusted bytecode"
702 This kernel feature is useful for number crunching applications
703 that may need to compute untrusted bytecode during their
704 execution. By using pipes or other transports made available to
705 the process as file descriptors supporting the read/write
706 syscalls, it's possible to isolate those applications in
707 their own address space using seccomp. Once seccomp is
708 enabled via /proc/<pid>/seccomp, it cannot be disabled
709 and the task is only allowed to execute a few safe syscalls
710 defined by each seccomp mode.
716 menu "Power Management"
718 config ARCH_HIBERNATION_POSSIBLE
721 source "kernel/power/Kconfig"
733 source "drivers/Kconfig"
737 source "arch/s390/Kconfig.debug"
739 source "security/Kconfig"
741 source "crypto/Kconfig"
745 menu "Virtualization"
749 prompt "Pseudo page fault support"
751 Select this option, if you want to use PFAULT pseudo page fault
752 handling under VM. If running native or in LPAR, this option
753 has no effect. If your VM does not support PFAULT, PAGEEX
754 pseudo page fault handling will be used.
755 Note that VM 4.2 supports PFAULT but has a bug in its
756 implementation that causes some problems.
757 Everybody who wants to run Linux under VM != VM4.2 should select
761 bool "VM shared kernel support"
762 depends on !JUMP_LABEL
764 Select this option, if you want to share the text segment of the
765 Linux kernel between different VM guests. This reduces memory
766 usage with lots of guests but greatly increases kernel size.
767 Also if a kernel was IPL'ed from a shared segment the kexec system
769 You should only select this option if you know what you are
770 doing and want to exploit this feature.
774 prompt "Cooperative memory management"
776 Select this option, if you want to enable the kernel interface
777 to reduce the memory size of the system. This is accomplished
778 by allocating pages of memory and put them "on hold". This only
779 makes sense for a system running under VM where the unused pages
780 will be reused by VM for other guest systems. The interface
781 allows an external monitor to balance memory of many systems.
782 Everybody who wants to run Linux under VM should select this
787 prompt "IUCV special message interface to cooperative memory management"
788 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
790 Select this option to enable the special message interface to
791 the cooperative memory management.
795 prompt "Linux - VM Monitor Stream, base infrastructure"
798 This provides a kernel interface for creating and updating z/VM APPLDATA
799 monitor records. The monitor records are updated at certain time
800 intervals, once the timer is started.
801 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
802 i.e. enables or disables monitoring on the Linux side.
803 A custom interval value (in seconds) can be written to
804 /proc/appldata/interval.
806 Defaults are 60 seconds interval and timer off.
807 The /proc entries can also be read from, showing the current settings.
811 prompt "Monitor memory management statistics"
812 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
814 This provides memory management related data to the Linux - VM Monitor
815 Stream, like paging/swapping rate, memory utilisation, etc.
816 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
817 APPLDATA monitor record, i.e. enables or disables monitoring this record
821 The /proc entry can also be read from, showing the current settings.
823 This can also be compiled as a module, which will be called
828 prompt "Monitor OS statistics"
829 depends on APPLDATA_BASE
831 This provides OS related data to the Linux - VM Monitor Stream, like
832 CPU utilisation, etc.
833 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
834 APPLDATA monitor record, i.e. enables or disables monitoring this record
838 This can also be compiled as a module, which will be called
841 config APPLDATA_NET_SUM
843 prompt "Monitor overall network statistics"
844 depends on APPLDATA_BASE && NET
846 This provides network related data to the Linux - VM Monitor Stream,
847 currently there is only a total sum of network I/O statistics, no
849 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
850 APPLDATA monitor record, i.e. enables or disables monitoring this record
854 This can also be compiled as a module, which will be called
859 prompt "s390 hypervisor file system support"
860 select SYS_HYPERVISOR
862 This is a virtual file system intended to provide accounting
863 information in an s390 hypervisor environment.
865 source "arch/s390/kvm/Kconfig"
869 prompt "s390 support for virtio devices"
871 select VIRTUALIZATION
873 select VIRTIO_CONSOLE
875 Enabling this option adds support for virtio based paravirtual device
878 Select this option if you want to run the kernel as a guest under
881 config S390_GUEST_OLD_TRANSPORT
883 prompt "Guest support for old s390 virtio transport (DEPRECATED)"
884 depends on S390_GUEST
886 Enable this option to add support for the old s390-virtio
887 transport (i.e. virtio devices NOT based on virtio-ccw). This
888 type of virtio devices is only available on the experimental
889 kuli userspace or with old (< 2.6) qemu. If you are running
890 with a modern version of qemu (which supports virtio-ccw since
891 1.4 and uses it by default since version 2.4), you probably won't