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_SG_CHAIN
73 select ARCH_HAS_STRICT_KERNEL_RWX
74 select ARCH_HAS_STRICT_MODULE_RWX
75 select ARCH_HAS_UBSAN_SANITIZE_ALL
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_WANTS_UBSAN_NO_NULL
113 select ARCH_WANT_IPC_PARSE_VERSION
114 select BUILDTIME_EXTABLE_SORT
115 select CLONE_BACKWARDS2
116 select DYNAMIC_FTRACE if FUNCTION_TRACER
117 select GENERIC_CLOCKEVENTS
118 select GENERIC_CPU_AUTOPROBE
119 select GENERIC_CPU_DEVICES if !SMP
120 select GENERIC_FIND_FIRST_BIT
121 select GENERIC_SMP_IDLE_THREAD
122 select GENERIC_TIME_VSYSCALL
123 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
124 select HAVE_ARCH_AUDITSYSCALL
125 select HAVE_ARCH_EARLY_PFN_TO_NID
126 select HAVE_ARCH_HARDENED_USERCOPY
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_DEBUG_KMEMLEAK
137 select HAVE_DMA_API_DEBUG
138 select HAVE_DMA_CONTIGUOUS
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
172 select THREAD_INFO_IN_TASK
174 select VIRT_CPU_ACCOUNTING
175 select ARCH_HAS_SCALED_CPUTIME
180 config SCHED_OMIT_FRAME_POINTER
183 config PGTABLE_LEVELS
187 source "init/Kconfig"
189 source "kernel/Kconfig.freezer"
191 source "kernel/livepatch/Kconfig"
193 menu "Processor type and features"
195 config HAVE_MARCH_Z900_FEATURES
198 config HAVE_MARCH_Z990_FEATURES
200 select HAVE_MARCH_Z900_FEATURES
202 config HAVE_MARCH_Z9_109_FEATURES
204 select HAVE_MARCH_Z990_FEATURES
206 config HAVE_MARCH_Z10_FEATURES
208 select HAVE_MARCH_Z9_109_FEATURES
210 config HAVE_MARCH_Z196_FEATURES
212 select HAVE_MARCH_Z10_FEATURES
214 config HAVE_MARCH_ZEC12_FEATURES
216 select HAVE_MARCH_Z196_FEATURES
218 config HAVE_MARCH_Z13_FEATURES
220 select HAVE_MARCH_ZEC12_FEATURES
223 prompt "Processor type"
227 bool "IBM zSeries model z800 and z900"
228 select HAVE_MARCH_Z900_FEATURES
230 Select this to enable optimizations for model z800/z900 (2064 and
231 2066 series). This will enable some optimizations that are not
232 available on older ESA/390 (31 Bit) only CPUs.
235 bool "IBM zSeries model z890 and z990"
236 select HAVE_MARCH_Z990_FEATURES
238 Select this to enable optimizations for model z890/z990 (2084 and
239 2086 series). The kernel will be slightly faster but will not work
244 select HAVE_MARCH_Z9_109_FEATURES
246 Select this to enable optimizations for IBM System z9 (2094 and
247 2096 series). The kernel will be slightly faster but will not work
251 bool "IBM System z10"
252 select HAVE_MARCH_Z10_FEATURES
254 Select this to enable optimizations for IBM System z10 (2097 and
255 2098 series). The kernel will be slightly faster but will not work
259 bool "IBM zEnterprise 114 and 196"
260 select HAVE_MARCH_Z196_FEATURES
262 Select this to enable optimizations for IBM zEnterprise 114 and 196
263 (2818 and 2817 series). The kernel will be slightly faster but will
264 not work on older machines.
267 bool "IBM zBC12 and zEC12"
268 select HAVE_MARCH_ZEC12_FEATURES
270 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
271 2827 series). The kernel will be slightly faster but will not work on
275 bool "IBM z13s and z13"
276 select HAVE_MARCH_Z13_FEATURES
278 Select this to enable optimizations for IBM z13s and z13 (2965 and
279 2964 series). The kernel will be slightly faster but will not work on
284 config MARCH_Z900_TUNE
285 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
287 config MARCH_Z990_TUNE
288 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
290 config MARCH_Z9_109_TUNE
291 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
293 config MARCH_Z10_TUNE
294 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
296 config MARCH_Z196_TUNE
297 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
299 config MARCH_ZEC12_TUNE
300 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
302 config MARCH_Z13_TUNE
303 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
306 prompt "Tune code generation"
309 Cause the compiler to tune (-mtune) the generated code for a machine.
310 This will make the code run faster on the selected machine but
311 somewhat slower on other machines.
312 This option only changes how the compiler emits instructions, not the
313 selection of instructions itself, so the resulting kernel will run on
319 Tune the generated code for the target processor for which the kernel
323 bool "IBM zSeries model z800 and z900"
326 bool "IBM zSeries model z890 and z990"
332 bool "IBM System z10"
335 bool "IBM zEnterprise 114 and 196"
338 bool "IBM zBC12 and zEC12"
350 prompt "Kernel support for 31 bit emulation"
351 select COMPAT_BINFMT_ELF if BINFMT_ELF
352 select ARCH_WANT_OLD_COMPAT_IPC
353 select COMPAT_OLD_SIGACTION
356 Select this option if you want to enable your system kernel to
357 handle system-calls from ELF binaries for 31 bit ESA. This option
358 (and some other stuff like libraries and such) is needed for
359 executing 31 bit applications. It is safe to say "Y".
361 config SYSVIPC_COMPAT
362 def_bool y if COMPAT && SYSVIPC
365 def_bool y if COMPAT && KEYS
369 prompt "Symmetric multi-processing support"
371 This enables support for systems with more than one CPU. If you have
372 a system with only one CPU, like most personal computers, say N. If
373 you have a system with more than one CPU, say Y.
375 If you say N here, the kernel will run on uni- and multiprocessor
376 machines, but will use only one CPU of a multiprocessor machine. If
377 you say Y here, the kernel will run on many, but not all,
378 uniprocessor machines. On a uniprocessor machine, the kernel
379 will run faster if you say N here.
381 See also the SMP-HOWTO available at
382 <http://www.tldp.org/docs.html#howto>.
384 Even if you don't know what to do here, say Y.
387 int "Maximum number of CPUs (2-512)"
392 This allows you to specify the maximum number of CPUs which this
393 kernel will support. The maximum supported value is 512 and the
394 minimum value which makes sense is 2.
396 This is purely to save memory - each supported CPU adds
397 approximately sixteen kilobytes to the kernel image.
401 prompt "Support for hot-pluggable CPUs"
404 Say Y here to be able to turn CPUs off and on. CPUs
405 can be controlled through /sys/devices/system/cpu/cpu#.
406 Say N if you want to disable CPU hotplug.
408 # Some NUMA nodes have memory ranges that span
409 # other nodes. Even though a pfn is valid and
410 # between a node's start and end pfns, it may not
411 # reside on that node. See memmap_init_zone()
412 # for details. <- They meant memory holes!
413 config NODES_SPAN_OTHER_NODES
418 depends on SMP && SCHED_TOPOLOGY
423 This option adds NUMA support to the kernel.
425 An operation mode can be selected by appending
426 numa=<method> to the kernel command line.
428 The default behaviour is identical to appending numa=plain to
429 the command line. This will create just one node with all
430 available memory and all CPUs in it.
433 int "Maximum NUMA nodes (as a power of 2)"
438 Specify the maximum number of NUMA nodes available on the target
439 system. Increases memory reserved to accommodate various tables.
441 menu "Select NUMA modes"
445 bool "NUMA emulation"
448 Numa emulation mode will split the available system memory into
449 equal chunks which then are distributed over the configured number
450 of nodes in a round-robin manner.
452 The number of fake nodes is limited by the number of available memory
453 chunks (i.e. memory size / fake size) and the number of supported
456 The CPUs are assigned to the nodes in a way that partially respects
457 the original machine topology (if supported by the machine).
458 Fair distribution of the CPUs is not guaranteed.
461 hex "NUMA emulation memory chunk size"
463 range 0x400000 0x100000000
466 Select the default size by which the memory is chopped and then
467 assigned to emulated NUMA nodes.
469 This can be overridden by specifying
473 on the kernel command line where also suffixes K, M, G, and T are
490 config SCHED_TOPOLOGY
492 prompt "Topology scheduler support"
499 Topology scheduler support improves the CPU scheduler's decision
500 making when dealing with machines that have multi-threading,
501 multiple cores or multiple books.
503 source kernel/Kconfig.preempt
505 source kernel/Kconfig.hz
511 config ARCH_SPARSEMEM_ENABLE
513 select SPARSEMEM_VMEMMAP_ENABLE
514 select SPARSEMEM_VMEMMAP
516 config ARCH_SPARSEMEM_DEFAULT
519 config ARCH_SELECT_MEMORY_MODEL
522 config ARCH_ENABLE_MEMORY_HOTPLUG
523 def_bool y if SPARSEMEM
525 config ARCH_ENABLE_MEMORY_HOTREMOVE
528 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
531 config FORCE_MAX_ZONEORDER
539 prompt "Pack kernel stack"
541 This option enables the compiler option -mkernel-backchain if it
542 is available. If the option is available the compiler supports
543 the new stack layout which dramatically reduces the minimum stack
544 frame size. With an old compiler a non-leaf function needs a
545 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
546 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
547 and 24 byte on 64 bit.
549 Say Y if you are unsure.
553 prompt "Detect kernel stack overflow"
555 This option enables the compiler option -mstack-guard and
556 -mstack-size if they are available. If the compiler supports them
557 it will emit additional code to each function prolog to trigger
558 an illegal operation if the kernel stack is about to overflow.
560 Say N if you are unsure.
563 int "Size of the guard area (128-1024)"
565 depends on CHECK_STACK
568 This allows you to specify the size of the guard area at the lower
569 end of the kernel stack. If the kernel stack points into the guard
570 area on function entry an illegal operation is triggered. The size
571 needs to be a power of 2. Please keep in mind that the size of an
572 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
573 The minimum size for the stack guard should be 256 for 31 bit and
576 config WARN_DYNAMIC_STACK
578 prompt "Emit compiler warnings for function with dynamic stack usage"
580 This option enables the compiler option -mwarn-dynamicstack. If the
581 compiler supports this options generates warnings for functions
582 that dynamically allocate stack space using alloca.
584 Say N if you are unsure.
592 prompt "QDIO support"
594 This driver provides the Queued Direct I/O base support for
597 To compile this driver as a module, choose M here: the
598 module will be called qdio.
611 config PCI_NR_FUNCTIONS
612 int "Maximum number of PCI functions (1-4096)"
616 This allows you to specify the maximum number of PCI functions which
617 this kernel will support.
619 source "drivers/pci/Kconfig"
632 config NEED_SG_DMA_LENGTH
635 config NEED_DMA_MAP_STATE
640 prompt "Support for CHSC subchannels"
642 This driver allows usage of CHSC subchannels. A CHSC subchannel
643 is usually present on LPAR only.
644 The driver creates a device /dev/chsc, which may be used to
645 obtain I/O configuration information about the machine and
646 to issue asynchronous chsc commands (DANGEROUS).
647 You will usually only want to use this interface on a special
648 LPAR designated for system management.
650 To compile this driver as a module, choose M here: the
651 module will be called chsc_sch.
657 prompt "SCM bus driver"
659 Bus driver for Storage Class Memory.
663 prompt "Support for EADM subchannels"
666 This driver allows usage of EADM subchannels. EADM subchannels act
667 as a communication vehicle for SCM increments.
669 To compile this driver as a module, choose M here: the
670 module will be called eadm_sch.
677 bool "kernel crash dumps"
681 Generate crash dump after being started by kexec.
682 Crash dump kernels are loaded in the main kernel with kexec-tools
683 into a specially reserved region and then later executed after
684 a crash by kdump/kexec.
685 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
686 This option also enables s390 zfcpdump.
687 See also <file:Documentation/s390/zfcpdump.txt>
691 menu "Executable file formats / Emulations"
693 source "fs/Kconfig.binfmt"
697 prompt "Enable seccomp to safely compute untrusted bytecode"
700 This kernel feature is useful for number crunching applications
701 that may need to compute untrusted bytecode during their
702 execution. By using pipes or other transports made available to
703 the process as file descriptors supporting the read/write
704 syscalls, it's possible to isolate those applications in
705 their own address space using seccomp. Once seccomp is
706 enabled via /proc/<pid>/seccomp, it cannot be disabled
707 and the task is only allowed to execute a few safe syscalls
708 defined by each seccomp mode.
714 menu "Power Management"
716 config ARCH_HIBERNATION_POSSIBLE
719 source "kernel/power/Kconfig"
731 source "drivers/Kconfig"
735 source "arch/s390/Kconfig.debug"
737 source "security/Kconfig"
739 source "crypto/Kconfig"
743 menu "Virtualization"
747 prompt "Pseudo page fault support"
749 Select this option, if you want to use PFAULT pseudo page fault
750 handling under VM. If running native or in LPAR, this option
751 has no effect. If your VM does not support PFAULT, PAGEEX
752 pseudo page fault handling will be used.
753 Note that VM 4.2 supports PFAULT but has a bug in its
754 implementation that causes some problems.
755 Everybody who wants to run Linux under VM != VM4.2 should select
759 bool "VM shared kernel support"
760 depends on !JUMP_LABEL
762 Select this option, if you want to share the text segment of the
763 Linux kernel between different VM guests. This reduces memory
764 usage with lots of guests but greatly increases kernel size.
765 Also if a kernel was IPL'ed from a shared segment the kexec system
767 You should only select this option if you know what you are
768 doing and want to exploit this feature.
772 prompt "Cooperative memory management"
774 Select this option, if you want to enable the kernel interface
775 to reduce the memory size of the system. This is accomplished
776 by allocating pages of memory and put them "on hold". This only
777 makes sense for a system running under VM where the unused pages
778 will be reused by VM for other guest systems. The interface
779 allows an external monitor to balance memory of many systems.
780 Everybody who wants to run Linux under VM should select this
785 prompt "IUCV special message interface to cooperative memory management"
786 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
788 Select this option to enable the special message interface to
789 the cooperative memory management.
793 prompt "Linux - VM Monitor Stream, base infrastructure"
796 This provides a kernel interface for creating and updating z/VM APPLDATA
797 monitor records. The monitor records are updated at certain time
798 intervals, once the timer is started.
799 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
800 i.e. enables or disables monitoring on the Linux side.
801 A custom interval value (in seconds) can be written to
802 /proc/appldata/interval.
804 Defaults are 60 seconds interval and timer off.
805 The /proc entries can also be read from, showing the current settings.
809 prompt "Monitor memory management statistics"
810 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
812 This provides memory management related data to the Linux - VM Monitor
813 Stream, like paging/swapping rate, memory utilisation, etc.
814 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
815 APPLDATA monitor record, i.e. enables or disables monitoring this record
819 The /proc entry can also be read from, showing the current settings.
821 This can also be compiled as a module, which will be called
826 prompt "Monitor OS statistics"
827 depends on APPLDATA_BASE
829 This provides OS related data to the Linux - VM Monitor Stream, like
830 CPU utilisation, etc.
831 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
832 APPLDATA monitor record, i.e. enables or disables monitoring this record
836 This can also be compiled as a module, which will be called
839 config APPLDATA_NET_SUM
841 prompt "Monitor overall network statistics"
842 depends on APPLDATA_BASE && NET
844 This provides network related data to the Linux - VM Monitor Stream,
845 currently there is only a total sum of network I/O statistics, no
847 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
848 APPLDATA monitor record, i.e. enables or disables monitoring this record
852 This can also be compiled as a module, which will be called
857 prompt "s390 hypervisor file system support"
858 select SYS_HYPERVISOR
860 This is a virtual file system intended to provide accounting
861 information in an s390 hypervisor environment.
863 source "arch/s390/kvm/Kconfig"
867 prompt "s390 support for virtio devices"
869 select VIRTUALIZATION
871 select VIRTIO_CONSOLE
873 Enabling this option adds support for virtio based paravirtual device
876 Select this option if you want to run the kernel as a guest under
879 config S390_GUEST_OLD_TRANSPORT
881 prompt "Guest support for old s390 virtio transport (DEPRECATED)"
882 depends on S390_GUEST
884 Enable this option to add support for the old s390-virtio
885 transport (i.e. virtio devices NOT based on virtio-ccw). This
886 type of virtio devices is only available on the experimental
887 kuli userspace or with old (< 2.6) qemu. If you are running
888 with a modern version of qemu (which supports virtio-ccw since
889 1.4 and uses it by default since version 2.4), you probably won't