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
70 select ARCH_HAS_DEVMEM_IS_ALLOWED
71 select ARCH_HAS_ELF_RANDOMIZE
72 select ARCH_HAS_GCOV_PROFILE_ALL
73 select ARCH_HAS_GIGANTIC_PAGE
75 select ARCH_HAS_SG_CHAIN
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_DYNAMIC_FTRACE
140 select HAVE_DYNAMIC_FTRACE_WITH_REGS
141 select HAVE_EFFICIENT_UNALIGNED_ACCESS
142 select HAVE_EXIT_THREAD
143 select HAVE_FTRACE_MCOUNT_RECORD
144 select HAVE_FUNCTION_GRAPH_TRACER
145 select HAVE_FUNCTION_TRACER
146 select HAVE_FUTEX_CMPXCHG if FUTEX
147 select HAVE_KERNEL_BZIP2
148 select HAVE_KERNEL_GZIP
149 select HAVE_KERNEL_LZ4
150 select HAVE_KERNEL_LZMA
151 select HAVE_KERNEL_LZO
152 select HAVE_KERNEL_XZ
154 select HAVE_KRETPROBES
156 select HAVE_LIVEPATCH
158 select HAVE_MEMBLOCK_NODE_MAP
159 select HAVE_MEMBLOCK_PHYS_MAP
160 select HAVE_MOD_ARCH_SPECIFIC
162 select HAVE_PERF_EVENTS
163 select HAVE_REGS_AND_STACK_ACCESS_API
164 select HAVE_SYSCALL_TRACEPOINTS
165 select HAVE_VIRT_CPU_ACCOUNTING
166 select MODULES_USE_ELF_RELA
169 select OLD_SIGSUSPEND3
171 select SYSCTL_EXCEPTION_TRACE
173 select VIRT_CPU_ACCOUNTING
178 config SCHED_OMIT_FRAME_POINTER
181 config PGTABLE_LEVELS
185 source "init/Kconfig"
187 source "kernel/Kconfig.freezer"
189 source "kernel/livepatch/Kconfig"
191 menu "Processor type and features"
193 config HAVE_MARCH_Z900_FEATURES
196 config HAVE_MARCH_Z990_FEATURES
198 select HAVE_MARCH_Z900_FEATURES
200 config HAVE_MARCH_Z9_109_FEATURES
202 select HAVE_MARCH_Z990_FEATURES
204 config HAVE_MARCH_Z10_FEATURES
206 select HAVE_MARCH_Z9_109_FEATURES
208 config HAVE_MARCH_Z196_FEATURES
210 select HAVE_MARCH_Z10_FEATURES
212 config HAVE_MARCH_ZEC12_FEATURES
214 select HAVE_MARCH_Z196_FEATURES
216 config HAVE_MARCH_Z13_FEATURES
218 select HAVE_MARCH_ZEC12_FEATURES
221 prompt "Processor type"
225 bool "IBM zSeries model z800 and z900"
226 select HAVE_MARCH_Z900_FEATURES
228 Select this to enable optimizations for model z800/z900 (2064 and
229 2066 series). This will enable some optimizations that are not
230 available on older ESA/390 (31 Bit) only CPUs.
233 bool "IBM zSeries model z890 and z990"
234 select HAVE_MARCH_Z990_FEATURES
236 Select this to enable optimizations for model z890/z990 (2084 and
237 2086 series). The kernel will be slightly faster but will not work
242 select HAVE_MARCH_Z9_109_FEATURES
244 Select this to enable optimizations for IBM System z9 (2094 and
245 2096 series). The kernel will be slightly faster but will not work
249 bool "IBM System z10"
250 select HAVE_MARCH_Z10_FEATURES
252 Select this to enable optimizations for IBM System z10 (2097 and
253 2098 series). The kernel will be slightly faster but will not work
257 bool "IBM zEnterprise 114 and 196"
258 select HAVE_MARCH_Z196_FEATURES
260 Select this to enable optimizations for IBM zEnterprise 114 and 196
261 (2818 and 2817 series). The kernel will be slightly faster but will
262 not work on older machines.
265 bool "IBM zBC12 and zEC12"
266 select HAVE_MARCH_ZEC12_FEATURES
268 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
269 2827 series). The kernel will be slightly faster but will not work on
273 bool "IBM z13s and z13"
274 select HAVE_MARCH_Z13_FEATURES
276 Select this to enable optimizations for IBM z13s and z13 (2965 and
277 2964 series). The kernel will be slightly faster but will not work on
282 config MARCH_Z900_TUNE
283 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
285 config MARCH_Z990_TUNE
286 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
288 config MARCH_Z9_109_TUNE
289 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
291 config MARCH_Z10_TUNE
292 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
294 config MARCH_Z196_TUNE
295 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
297 config MARCH_ZEC12_TUNE
298 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
300 config MARCH_Z13_TUNE
301 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
304 prompt "Tune code generation"
307 Cause the compiler to tune (-mtune) the generated code for a machine.
308 This will make the code run faster on the selected machine but
309 somewhat slower on other machines.
310 This option only changes how the compiler emits instructions, not the
311 selection of instructions itself, so the resulting kernel will run on
317 Tune the generated code for the target processor for which the kernel
321 bool "IBM zSeries model z800 and z900"
324 bool "IBM zSeries model z890 and z990"
330 bool "IBM System z10"
333 bool "IBM zEnterprise 114 and 196"
336 bool "IBM zBC12 and zEC12"
348 prompt "Kernel support for 31 bit emulation"
349 select COMPAT_BINFMT_ELF if BINFMT_ELF
350 select ARCH_WANT_OLD_COMPAT_IPC
351 select COMPAT_OLD_SIGACTION
354 Select this option if you want to enable your system kernel to
355 handle system-calls from ELF binaries for 31 bit ESA. This option
356 (and some other stuff like libraries and such) is needed for
357 executing 31 bit applications. It is safe to say "Y".
359 config SYSVIPC_COMPAT
360 def_bool y if COMPAT && SYSVIPC
363 def_bool y if COMPAT && KEYS
367 prompt "Symmetric multi-processing support"
369 This enables support for systems with more than one CPU. If you have
370 a system with only one CPU, like most personal computers, say N. If
371 you have a system with more than one CPU, say Y.
373 If you say N here, the kernel will run on uni- and multiprocessor
374 machines, but will use only one CPU of a multiprocessor machine. If
375 you say Y here, the kernel will run on many, but not all,
376 uniprocessor machines. On a uniprocessor machine, the kernel
377 will run faster if you say N here.
379 See also the SMP-HOWTO available at
380 <http://www.tldp.org/docs.html#howto>.
382 Even if you don't know what to do here, say Y.
385 int "Maximum number of CPUs (2-512)"
390 This allows you to specify the maximum number of CPUs which this
391 kernel will support. The maximum supported value is 512 and the
392 minimum value which makes sense is 2.
394 This is purely to save memory - each supported CPU adds
395 approximately sixteen kilobytes to the kernel image.
399 prompt "Support for hot-pluggable CPUs"
402 Say Y here to be able to turn CPUs off and on. CPUs
403 can be controlled through /sys/devices/system/cpu/cpu#.
404 Say N if you want to disable CPU hotplug.
406 # Some NUMA nodes have memory ranges that span
407 # other nodes. Even though a pfn is valid and
408 # between a node's start and end pfns, it may not
409 # reside on that node. See memmap_init_zone()
410 # for details. <- They meant memory holes!
411 config NODES_SPAN_OTHER_NODES
416 depends on SMP && SCHED_TOPOLOGY
421 This option adds NUMA support to the kernel.
423 An operation mode can be selected by appending
424 numa=<method> to the kernel command line.
426 The default behaviour is identical to appending numa=plain to
427 the command line. This will create just one node with all
428 available memory and all CPUs in it.
431 int "Maximum NUMA nodes (as a power of 2)"
436 Specify the maximum number of NUMA nodes available on the target
437 system. Increases memory reserved to accommodate various tables.
439 menu "Select NUMA modes"
443 bool "NUMA emulation"
446 Numa emulation mode will split the available system memory into
447 equal chunks which then are distributed over the configured number
448 of nodes in a round-robin manner.
450 The number of fake nodes is limited by the number of available memory
451 chunks (i.e. memory size / fake size) and the number of supported
454 The CPUs are assigned to the nodes in a way that partially respects
455 the original machine topology (if supported by the machine).
456 Fair distribution of the CPUs is not guaranteed.
459 hex "NUMA emulation memory chunk size"
461 range 0x400000 0x100000000
464 Select the default size by which the memory is chopped and then
465 assigned to emulated NUMA nodes.
467 This can be overridden by specifying
471 on the kernel command line where also suffixes K, M, G, and T are
488 config SCHED_TOPOLOGY
490 prompt "Topology scheduler support"
497 Topology scheduler support improves the CPU scheduler's decision
498 making when dealing with machines that have multi-threading,
499 multiple cores or multiple books.
501 source kernel/Kconfig.preempt
503 source kernel/Kconfig.hz
509 config ARCH_SPARSEMEM_ENABLE
511 select SPARSEMEM_VMEMMAP_ENABLE
512 select SPARSEMEM_VMEMMAP
514 config ARCH_SPARSEMEM_DEFAULT
517 config ARCH_SELECT_MEMORY_MODEL
520 config ARCH_ENABLE_MEMORY_HOTPLUG
521 def_bool y if SPARSEMEM
523 config ARCH_ENABLE_MEMORY_HOTREMOVE
526 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
529 config FORCE_MAX_ZONEORDER
537 prompt "Pack kernel stack"
539 This option enables the compiler option -mkernel-backchain if it
540 is available. If the option is available the compiler supports
541 the new stack layout which dramatically reduces the minimum stack
542 frame size. With an old compiler a non-leaf function needs a
543 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
544 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
545 and 24 byte on 64 bit.
547 Say Y if you are unsure.
551 prompt "Detect kernel stack overflow"
553 This option enables the compiler option -mstack-guard and
554 -mstack-size if they are available. If the compiler supports them
555 it will emit additional code to each function prolog to trigger
556 an illegal operation if the kernel stack is about to overflow.
558 Say N if you are unsure.
561 int "Size of the guard area (128-1024)"
563 depends on CHECK_STACK
566 This allows you to specify the size of the guard area at the lower
567 end of the kernel stack. If the kernel stack points into the guard
568 area on function entry an illegal operation is triggered. The size
569 needs to be a power of 2. Please keep in mind that the size of an
570 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
571 The minimum size for the stack guard should be 256 for 31 bit and
574 config WARN_DYNAMIC_STACK
576 prompt "Emit compiler warnings for function with dynamic stack usage"
578 This option enables the compiler option -mwarn-dynamicstack. If the
579 compiler supports this options generates warnings for functions
580 that dynamically allocate stack space using alloca.
582 Say N if you are unsure.
590 prompt "QDIO support"
592 This driver provides the Queued Direct I/O base support for
595 To compile this driver as a module, choose M here: the
596 module will be called qdio.
609 config PCI_NR_FUNCTIONS
610 int "Maximum number of PCI functions (1-4096)"
614 This allows you to specify the maximum number of PCI functions which
615 this kernel will support.
617 source "drivers/pci/Kconfig"
630 config NEED_SG_DMA_LENGTH
633 config NEED_DMA_MAP_STATE
638 prompt "Support for CHSC subchannels"
640 This driver allows usage of CHSC subchannels. A CHSC subchannel
641 is usually present on LPAR only.
642 The driver creates a device /dev/chsc, which may be used to
643 obtain I/O configuration information about the machine and
644 to issue asynchronous chsc commands (DANGEROUS).
645 You will usually only want to use this interface on a special
646 LPAR designated for system management.
648 To compile this driver as a module, choose M here: the
649 module will be called chsc_sch.
655 prompt "SCM bus driver"
657 Bus driver for Storage Class Memory.
661 prompt "Support for EADM subchannels"
664 This driver allows usage of EADM subchannels. EADM subchannels act
665 as a communication vehicle for SCM increments.
667 To compile this driver as a module, choose M here: the
668 module will be called eadm_sch.
675 bool "kernel crash dumps"
679 Generate crash dump after being started by kexec.
680 Crash dump kernels are loaded in the main kernel with kexec-tools
681 into a specially reserved region and then later executed after
682 a crash by kdump/kexec.
683 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
684 This option also enables s390 zfcpdump.
685 See also <file:Documentation/s390/zfcpdump.txt>
689 menu "Executable file formats / Emulations"
691 source "fs/Kconfig.binfmt"
695 prompt "Enable seccomp to safely compute untrusted bytecode"
698 This kernel feature is useful for number crunching applications
699 that may need to compute untrusted bytecode during their
700 execution. By using pipes or other transports made available to
701 the process as file descriptors supporting the read/write
702 syscalls, it's possible to isolate those applications in
703 their own address space using seccomp. Once seccomp is
704 enabled via /proc/<pid>/seccomp, it cannot be disabled
705 and the task is only allowed to execute a few safe syscalls
706 defined by each seccomp mode.
712 menu "Power Management"
714 config ARCH_HIBERNATION_POSSIBLE
717 source "kernel/power/Kconfig"
729 source "drivers/Kconfig"
733 source "arch/s390/Kconfig.debug"
735 source "security/Kconfig"
737 source "crypto/Kconfig"
741 menu "Virtualization"
745 prompt "Pseudo page fault support"
747 Select this option, if you want to use PFAULT pseudo page fault
748 handling under VM. If running native or in LPAR, this option
749 has no effect. If your VM does not support PFAULT, PAGEEX
750 pseudo page fault handling will be used.
751 Note that VM 4.2 supports PFAULT but has a bug in its
752 implementation that causes some problems.
753 Everybody who wants to run Linux under VM != VM4.2 should select
757 bool "VM shared kernel support"
758 depends on !JUMP_LABEL
760 Select this option, if you want to share the text segment of the
761 Linux kernel between different VM guests. This reduces memory
762 usage with lots of guests but greatly increases kernel size.
763 Also if a kernel was IPL'ed from a shared segment the kexec system
765 You should only select this option if you know what you are
766 doing and want to exploit this feature.
770 prompt "Cooperative memory management"
772 Select this option, if you want to enable the kernel interface
773 to reduce the memory size of the system. This is accomplished
774 by allocating pages of memory and put them "on hold". This only
775 makes sense for a system running under VM where the unused pages
776 will be reused by VM for other guest systems. The interface
777 allows an external monitor to balance memory of many systems.
778 Everybody who wants to run Linux under VM should select this
783 prompt "IUCV special message interface to cooperative memory management"
784 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
786 Select this option to enable the special message interface to
787 the cooperative memory management.
791 prompt "Linux - VM Monitor Stream, base infrastructure"
794 This provides a kernel interface for creating and updating z/VM APPLDATA
795 monitor records. The monitor records are updated at certain time
796 intervals, once the timer is started.
797 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
798 i.e. enables or disables monitoring on the Linux side.
799 A custom interval value (in seconds) can be written to
800 /proc/appldata/interval.
802 Defaults are 60 seconds interval and timer off.
803 The /proc entries can also be read from, showing the current settings.
807 prompt "Monitor memory management statistics"
808 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
810 This provides memory management related data to the Linux - VM Monitor
811 Stream, like paging/swapping rate, memory utilisation, etc.
812 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
813 APPLDATA monitor record, i.e. enables or disables monitoring this record
817 The /proc entry can also be read from, showing the current settings.
819 This can also be compiled as a module, which will be called
824 prompt "Monitor OS statistics"
825 depends on APPLDATA_BASE
827 This provides OS related data to the Linux - VM Monitor Stream, like
828 CPU utilisation, etc.
829 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
830 APPLDATA monitor record, i.e. enables or disables monitoring this record
834 This can also be compiled as a module, which will be called
837 config APPLDATA_NET_SUM
839 prompt "Monitor overall network statistics"
840 depends on APPLDATA_BASE && NET
842 This provides network related data to the Linux - VM Monitor Stream,
843 currently there is only a total sum of network I/O statistics, no
845 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
846 APPLDATA monitor record, i.e. enables or disables monitoring this record
850 This can also be compiled as a module, which will be called
855 prompt "s390 hypervisor file system support"
856 select SYS_HYPERVISOR
858 This is a virtual file system intended to provide accounting
859 information in an s390 hypervisor environment.
861 source "arch/s390/kvm/Kconfig"
865 prompt "s390 support for virtio devices"
867 select VIRTUALIZATION
869 select VIRTIO_CONSOLE
871 Enabling this option adds support for virtio based paravirtual device
874 Select this option if you want to run the kernel as a guest under
877 config S390_GUEST_OLD_TRANSPORT
879 prompt "Guest support for old s390 virtio transport (DEPRECATED)"
880 depends on S390_GUEST
882 Enable this option to add support for the old s390-virtio
883 transport (i.e. virtio devices NOT based on virtio-ccw). This
884 type of virtio devices is only available on the experimental
885 kuli userspace or with old (< 2.6) qemu. If you are running
886 with a modern version of qemu (which supports virtio-ccw since
887 1.4 and uses it by default since version 2.4), you probably won't