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_ATOMIC64_DEC_IF_POSITIVE
71 select ARCH_HAS_DEVMEM_IS_ALLOWED
72 select ARCH_HAS_ELF_RANDOMIZE
73 select ARCH_HAS_GCOV_PROFILE_ALL
75 select ARCH_HAS_SG_CHAIN
76 select ARCH_HAVE_NMI_SAFE_CMPXCHG
77 select ARCH_INLINE_READ_LOCK
78 select ARCH_INLINE_READ_LOCK_BH
79 select ARCH_INLINE_READ_LOCK_IRQ
80 select ARCH_INLINE_READ_LOCK_IRQSAVE
81 select ARCH_INLINE_READ_TRYLOCK
82 select ARCH_INLINE_READ_UNLOCK
83 select ARCH_INLINE_READ_UNLOCK_BH
84 select ARCH_INLINE_READ_UNLOCK_IRQ
85 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
86 select ARCH_INLINE_SPIN_LOCK
87 select ARCH_INLINE_SPIN_LOCK_BH
88 select ARCH_INLINE_SPIN_LOCK_IRQ
89 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
90 select ARCH_INLINE_SPIN_TRYLOCK
91 select ARCH_INLINE_SPIN_TRYLOCK_BH
92 select ARCH_INLINE_SPIN_UNLOCK
93 select ARCH_INLINE_SPIN_UNLOCK_BH
94 select ARCH_INLINE_SPIN_UNLOCK_IRQ
95 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
96 select ARCH_INLINE_WRITE_LOCK
97 select ARCH_INLINE_WRITE_LOCK_BH
98 select ARCH_INLINE_WRITE_LOCK_IRQ
99 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
100 select ARCH_INLINE_WRITE_TRYLOCK
101 select ARCH_INLINE_WRITE_UNLOCK
102 select ARCH_INLINE_WRITE_UNLOCK_BH
103 select ARCH_INLINE_WRITE_UNLOCK_IRQ
104 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
105 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
106 select ARCH_SUPPORTS_ATOMIC_RMW
107 select ARCH_SUPPORTS_NUMA_BALANCING
108 select ARCH_USE_BUILTIN_BSWAP
109 select ARCH_USE_CMPXCHG_LOCKREF
110 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
111 select ARCH_WANTS_PROT_NUMA_PROT_NONE
112 select ARCH_WANT_IPC_PARSE_VERSION
113 select BUILDTIME_EXTABLE_SORT
114 select CLONE_BACKWARDS2
115 select DYNAMIC_FTRACE if FUNCTION_TRACER
116 select GENERIC_CLOCKEVENTS
117 select GENERIC_CPU_AUTOPROBE
118 select GENERIC_CPU_DEVICES if !SMP
119 select GENERIC_FIND_FIRST_BIT
120 select GENERIC_SMP_IDLE_THREAD
121 select GENERIC_TIME_VSYSCALL
122 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
123 select HAVE_ARCH_AUDITSYSCALL
124 select HAVE_ARCH_EARLY_PFN_TO_NID
125 select HAVE_ARCH_HARDENED_USERCOPY
126 select HAVE_ARCH_JUMP_LABEL
127 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
128 select HAVE_ARCH_SECCOMP_FILTER
129 select HAVE_ARCH_SOFT_DIRTY
130 select HAVE_ARCH_TRACEHOOK
131 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
132 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
133 select HAVE_CMPXCHG_DOUBLE
134 select HAVE_CMPXCHG_LOCAL
135 select HAVE_DEBUG_KMEMLEAK
136 select HAVE_DMA_API_DEBUG
137 select HAVE_DYNAMIC_FTRACE
138 select HAVE_DYNAMIC_FTRACE_WITH_REGS
139 select HAVE_EXIT_THREAD
140 select HAVE_FTRACE_MCOUNT_RECORD
141 select HAVE_FUNCTION_GRAPH_TRACER
142 select HAVE_FUNCTION_TRACER
143 select HAVE_FUTEX_CMPXCHG if FUTEX
144 select HAVE_KERNEL_BZIP2
145 select HAVE_KERNEL_GZIP
146 select HAVE_KERNEL_LZ4
147 select HAVE_KERNEL_LZMA
148 select HAVE_KERNEL_LZO
149 select HAVE_KERNEL_XZ
151 select HAVE_KRETPROBES
153 select HAVE_LIVEPATCH
155 select HAVE_MEMBLOCK_NODE_MAP
156 select HAVE_MEMBLOCK_PHYS_MAP
157 select HAVE_MOD_ARCH_SPECIFIC
159 select HAVE_PERF_EVENTS
160 select HAVE_REGS_AND_STACK_ACCESS_API
161 select HAVE_SYSCALL_TRACEPOINTS
162 select HAVE_VIRT_CPU_ACCOUNTING
163 select MODULES_USE_ELF_RELA
166 select OLD_SIGSUSPEND3
168 select SYSCTL_EXCEPTION_TRACE
170 select VIRT_CPU_ACCOUNTING
175 config SCHED_OMIT_FRAME_POINTER
178 config PGTABLE_LEVELS
182 source "init/Kconfig"
184 source "kernel/Kconfig.freezer"
186 source "kernel/livepatch/Kconfig"
188 menu "Processor type and features"
190 config HAVE_MARCH_Z900_FEATURES
193 config HAVE_MARCH_Z990_FEATURES
195 select HAVE_MARCH_Z900_FEATURES
197 config HAVE_MARCH_Z9_109_FEATURES
199 select HAVE_MARCH_Z990_FEATURES
201 config HAVE_MARCH_Z10_FEATURES
203 select HAVE_MARCH_Z9_109_FEATURES
205 config HAVE_MARCH_Z196_FEATURES
207 select HAVE_MARCH_Z10_FEATURES
209 config HAVE_MARCH_ZEC12_FEATURES
211 select HAVE_MARCH_Z196_FEATURES
213 config HAVE_MARCH_Z13_FEATURES
215 select HAVE_MARCH_ZEC12_FEATURES
218 prompt "Processor type"
222 bool "IBM zSeries model z800 and z900"
223 select HAVE_MARCH_Z900_FEATURES
225 Select this to enable optimizations for model z800/z900 (2064 and
226 2066 series). This will enable some optimizations that are not
227 available on older ESA/390 (31 Bit) only CPUs.
230 bool "IBM zSeries model z890 and z990"
231 select HAVE_MARCH_Z990_FEATURES
233 Select this to enable optimizations for model z890/z990 (2084 and
234 2086 series). The kernel will be slightly faster but will not work
239 select HAVE_MARCH_Z9_109_FEATURES
241 Select this to enable optimizations for IBM System z9 (2094 and
242 2096 series). The kernel will be slightly faster but will not work
246 bool "IBM System z10"
247 select HAVE_MARCH_Z10_FEATURES
249 Select this to enable optimizations for IBM System z10 (2097 and
250 2098 series). The kernel will be slightly faster but will not work
254 bool "IBM zEnterprise 114 and 196"
255 select HAVE_MARCH_Z196_FEATURES
257 Select this to enable optimizations for IBM zEnterprise 114 and 196
258 (2818 and 2817 series). The kernel will be slightly faster but will
259 not work on older machines.
262 bool "IBM zBC12 and zEC12"
263 select HAVE_MARCH_ZEC12_FEATURES
265 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
266 2827 series). The kernel will be slightly faster but will not work on
270 bool "IBM z13s and z13"
271 select HAVE_MARCH_Z13_FEATURES
273 Select this to enable optimizations for IBM z13s and z13 (2965 and
274 2964 series). The kernel will be slightly faster but will not work on
279 config MARCH_Z900_TUNE
280 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
282 config MARCH_Z990_TUNE
283 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
285 config MARCH_Z9_109_TUNE
286 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
288 config MARCH_Z10_TUNE
289 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
291 config MARCH_Z196_TUNE
292 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
294 config MARCH_ZEC12_TUNE
295 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
297 config MARCH_Z13_TUNE
298 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
301 prompt "Tune code generation"
304 Cause the compiler to tune (-mtune) the generated code for a machine.
305 This will make the code run faster on the selected machine but
306 somewhat slower on other machines.
307 This option only changes how the compiler emits instructions, not the
308 selection of instructions itself, so the resulting kernel will run on
314 Tune the generated code for the target processor for which the kernel
318 bool "IBM zSeries model z800 and z900"
321 bool "IBM zSeries model z890 and z990"
327 bool "IBM System z10"
330 bool "IBM zEnterprise 114 and 196"
333 bool "IBM zBC12 and zEC12"
345 prompt "Kernel support for 31 bit emulation"
346 select COMPAT_BINFMT_ELF if BINFMT_ELF
347 select ARCH_WANT_OLD_COMPAT_IPC
348 select COMPAT_OLD_SIGACTION
351 Select this option if you want to enable your system kernel to
352 handle system-calls from ELF binaries for 31 bit ESA. This option
353 (and some other stuff like libraries and such) is needed for
354 executing 31 bit applications. It is safe to say "Y".
356 config SYSVIPC_COMPAT
357 def_bool y if COMPAT && SYSVIPC
360 def_bool y if COMPAT && KEYS
364 prompt "Symmetric multi-processing support"
366 This enables support for systems with more than one CPU. If you have
367 a system with only one CPU, like most personal computers, say N. If
368 you have a system with more than one CPU, say Y.
370 If you say N here, the kernel will run on uni- and multiprocessor
371 machines, but will use only one CPU of a multiprocessor machine. If
372 you say Y here, the kernel will run on many, but not all,
373 uniprocessor machines. On a uniprocessor machine, the kernel
374 will run faster if you say N here.
376 See also the SMP-HOWTO available at
377 <http://www.tldp.org/docs.html#howto>.
379 Even if you don't know what to do here, say Y.
382 int "Maximum number of CPUs (2-512)"
387 This allows you to specify the maximum number of CPUs which this
388 kernel will support. The maximum supported value is 512 and the
389 minimum value which makes sense is 2.
391 This is purely to save memory - each supported CPU adds
392 approximately sixteen kilobytes to the kernel image.
396 prompt "Support for hot-pluggable CPUs"
399 Say Y here to be able to turn CPUs off and on. CPUs
400 can be controlled through /sys/devices/system/cpu/cpu#.
401 Say N if you want to disable CPU hotplug.
403 # Some NUMA nodes have memory ranges that span
404 # other nodes. Even though a pfn is valid and
405 # between a node's start and end pfns, it may not
406 # reside on that node. See memmap_init_zone()
407 # for details. <- They meant memory holes!
408 config NODES_SPAN_OTHER_NODES
413 depends on SMP && SCHED_TOPOLOGY
418 This option adds NUMA support to the kernel.
420 An operation mode can be selected by appending
421 numa=<method> to the kernel command line.
423 The default behaviour is identical to appending numa=plain to
424 the command line. This will create just one node with all
425 available memory and all CPUs in it.
428 int "Maximum NUMA nodes (as a power of 2)"
433 Specify the maximum number of NUMA nodes available on the target
434 system. Increases memory reserved to accommodate various tables.
436 menu "Select NUMA modes"
440 bool "NUMA emulation"
443 Numa emulation mode will split the available system memory into
444 equal chunks which then are distributed over the configured number
445 of nodes in a round-robin manner.
447 The number of fake nodes is limited by the number of available memory
448 chunks (i.e. memory size / fake size) and the number of supported
451 The CPUs are assigned to the nodes in a way that partially respects
452 the original machine topology (if supported by the machine).
453 Fair distribution of the CPUs is not guaranteed.
456 hex "NUMA emulation memory chunk size"
458 range 0x400000 0x100000000
461 Select the default size by which the memory is chopped and then
462 assigned to emulated NUMA nodes.
464 This can be overridden by specifying
468 on the kernel command line where also suffixes K, M, G, and T are
485 config SCHED_TOPOLOGY
487 prompt "Topology scheduler support"
494 Topology scheduler support improves the CPU scheduler's decision
495 making when dealing with machines that have multi-threading,
496 multiple cores or multiple books.
498 source kernel/Kconfig.preempt
500 source kernel/Kconfig.hz
506 config ARCH_SPARSEMEM_ENABLE
508 select SPARSEMEM_VMEMMAP_ENABLE
509 select SPARSEMEM_VMEMMAP
511 config ARCH_SPARSEMEM_DEFAULT
514 config ARCH_SELECT_MEMORY_MODEL
517 config ARCH_ENABLE_MEMORY_HOTPLUG
518 def_bool y if SPARSEMEM
520 config ARCH_ENABLE_MEMORY_HOTREMOVE
523 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
526 config FORCE_MAX_ZONEORDER
534 prompt "Pack kernel stack"
536 This option enables the compiler option -mkernel-backchain if it
537 is available. If the option is available the compiler supports
538 the new stack layout which dramatically reduces the minimum stack
539 frame size. With an old compiler a non-leaf function needs a
540 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
541 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
542 and 24 byte on 64 bit.
544 Say Y if you are unsure.
548 prompt "Detect kernel stack overflow"
550 This option enables the compiler option -mstack-guard and
551 -mstack-size if they are available. If the compiler supports them
552 it will emit additional code to each function prolog to trigger
553 an illegal operation if the kernel stack is about to overflow.
555 Say N if you are unsure.
558 int "Size of the guard area (128-1024)"
560 depends on CHECK_STACK
563 This allows you to specify the size of the guard area at the lower
564 end of the kernel stack. If the kernel stack points into the guard
565 area on function entry an illegal operation is triggered. The size
566 needs to be a power of 2. Please keep in mind that the size of an
567 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
568 The minimum size for the stack guard should be 256 for 31 bit and
571 config WARN_DYNAMIC_STACK
573 prompt "Emit compiler warnings for function with dynamic stack usage"
575 This option enables the compiler option -mwarn-dynamicstack. If the
576 compiler supports this options generates warnings for functions
577 that dynamically allocate stack space using alloca.
579 Say N if you are unsure.
587 prompt "QDIO support"
589 This driver provides the Queued Direct I/O base support for
592 To compile this driver as a module, choose M here: the
593 module will be called qdio.
606 config PCI_NR_FUNCTIONS
607 int "Maximum number of PCI functions (1-4096)"
611 This allows you to specify the maximum number of PCI functions which
612 this kernel will support.
614 source "drivers/pci/Kconfig"
627 config NEED_SG_DMA_LENGTH
630 config NEED_DMA_MAP_STATE
635 prompt "Support for CHSC subchannels"
637 This driver allows usage of CHSC subchannels. A CHSC subchannel
638 is usually present on LPAR only.
639 The driver creates a device /dev/chsc, which may be used to
640 obtain I/O configuration information about the machine and
641 to issue asynchronous chsc commands (DANGEROUS).
642 You will usually only want to use this interface on a special
643 LPAR designated for system management.
645 To compile this driver as a module, choose M here: the
646 module will be called chsc_sch.
652 prompt "SCM bus driver"
654 Bus driver for Storage Class Memory.
658 prompt "Support for EADM subchannels"
661 This driver allows usage of EADM subchannels. EADM subchannels act
662 as a communication vehicle for SCM increments.
664 To compile this driver as a module, choose M here: the
665 module will be called eadm_sch.
672 bool "kernel crash dumps"
676 Generate crash dump after being started by kexec.
677 Crash dump kernels are loaded in the main kernel with kexec-tools
678 into a specially reserved region and then later executed after
679 a crash by kdump/kexec.
680 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
681 This option also enables s390 zfcpdump.
682 See also <file:Documentation/s390/zfcpdump.txt>
686 menu "Executable file formats / Emulations"
688 source "fs/Kconfig.binfmt"
692 prompt "Enable seccomp to safely compute untrusted bytecode"
695 This kernel feature is useful for number crunching applications
696 that may need to compute untrusted bytecode during their
697 execution. By using pipes or other transports made available to
698 the process as file descriptors supporting the read/write
699 syscalls, it's possible to isolate those applications in
700 their own address space using seccomp. Once seccomp is
701 enabled via /proc/<pid>/seccomp, it cannot be disabled
702 and the task is only allowed to execute a few safe syscalls
703 defined by each seccomp mode.
709 menu "Power Management"
711 config ARCH_HIBERNATION_POSSIBLE
714 source "kernel/power/Kconfig"
726 source "drivers/Kconfig"
730 source "arch/s390/Kconfig.debug"
732 source "security/Kconfig"
734 source "crypto/Kconfig"
738 menu "Virtualization"
742 prompt "Pseudo page fault support"
744 Select this option, if you want to use PFAULT pseudo page fault
745 handling under VM. If running native or in LPAR, this option
746 has no effect. If your VM does not support PFAULT, PAGEEX
747 pseudo page fault handling will be used.
748 Note that VM 4.2 supports PFAULT but has a bug in its
749 implementation that causes some problems.
750 Everybody who wants to run Linux under VM != VM4.2 should select
754 bool "VM shared kernel support"
755 depends on !JUMP_LABEL
757 Select this option, if you want to share the text segment of the
758 Linux kernel between different VM guests. This reduces memory
759 usage with lots of guests but greatly increases kernel size.
760 Also if a kernel was IPL'ed from a shared segment the kexec system
762 You should only select this option if you know what you are
763 doing and want to exploit this feature.
767 prompt "Cooperative memory management"
769 Select this option, if you want to enable the kernel interface
770 to reduce the memory size of the system. This is accomplished
771 by allocating pages of memory and put them "on hold". This only
772 makes sense for a system running under VM where the unused pages
773 will be reused by VM for other guest systems. The interface
774 allows an external monitor to balance memory of many systems.
775 Everybody who wants to run Linux under VM should select this
780 prompt "IUCV special message interface to cooperative memory management"
781 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
783 Select this option to enable the special message interface to
784 the cooperative memory management.
788 prompt "Linux - VM Monitor Stream, base infrastructure"
791 This provides a kernel interface for creating and updating z/VM APPLDATA
792 monitor records. The monitor records are updated at certain time
793 intervals, once the timer is started.
794 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
795 i.e. enables or disables monitoring on the Linux side.
796 A custom interval value (in seconds) can be written to
797 /proc/appldata/interval.
799 Defaults are 60 seconds interval and timer off.
800 The /proc entries can also be read from, showing the current settings.
804 prompt "Monitor memory management statistics"
805 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
807 This provides memory management related data to the Linux - VM Monitor
808 Stream, like paging/swapping rate, memory utilisation, etc.
809 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
810 APPLDATA monitor record, i.e. enables or disables monitoring this record
814 The /proc entry can also be read from, showing the current settings.
816 This can also be compiled as a module, which will be called
821 prompt "Monitor OS statistics"
822 depends on APPLDATA_BASE
824 This provides OS related data to the Linux - VM Monitor Stream, like
825 CPU utilisation, etc.
826 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
827 APPLDATA monitor record, i.e. enables or disables monitoring this record
831 This can also be compiled as a module, which will be called
834 config APPLDATA_NET_SUM
836 prompt "Monitor overall network statistics"
837 depends on APPLDATA_BASE && NET
839 This provides network related data to the Linux - VM Monitor Stream,
840 currently there is only a total sum of network I/O statistics, no
842 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
843 APPLDATA monitor record, i.e. enables or disables monitoring this record
847 This can also be compiled as a module, which will be called
852 prompt "s390 hypervisor file system support"
853 select SYS_HYPERVISOR
855 This is a virtual file system intended to provide accounting
856 information in an s390 hypervisor environment.
858 source "arch/s390/kvm/Kconfig"
862 prompt "s390 support for virtio devices"
864 select VIRTUALIZATION
866 select VIRTIO_CONSOLE
868 Enabling this option adds support for virtio based paravirtual device
871 Select this option if you want to run the kernel as a guest under
874 config S390_GUEST_OLD_TRANSPORT
876 prompt "Guest support for old s390 virtio transport (DEPRECATED)"
877 depends on S390_GUEST
879 Enable this option to add support for the old s390-virtio
880 transport (i.e. virtio devices NOT based on virtio-ccw). This
881 type of virtio devices is only available on the experimental
882 kuli userspace or with old (< 2.6) qemu. If you are running
883 with a modern version of qemu (which supports virtio-ccw since
884 1.4 and uses it by default since version 2.4), you probably won't