10 config STACKTRACE_SUPPORT
13 config HAVE_LATENCYTOP_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
61 config ARCH_SUPPORTS_UPROBES
66 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
67 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
68 select ARCH_HAS_ELF_RANDOMIZE
69 select ARCH_HAS_GCOV_PROFILE_ALL
70 select ARCH_HAS_SG_CHAIN
71 select ARCH_HAVE_NMI_SAFE_CMPXCHG
72 select ARCH_INLINE_READ_LOCK
73 select ARCH_INLINE_READ_LOCK_BH
74 select ARCH_INLINE_READ_LOCK_IRQ
75 select ARCH_INLINE_READ_LOCK_IRQSAVE
76 select ARCH_INLINE_READ_TRYLOCK
77 select ARCH_INLINE_READ_UNLOCK
78 select ARCH_INLINE_READ_UNLOCK_BH
79 select ARCH_INLINE_READ_UNLOCK_IRQ
80 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
81 select ARCH_INLINE_SPIN_LOCK
82 select ARCH_INLINE_SPIN_LOCK_BH
83 select ARCH_INLINE_SPIN_LOCK_IRQ
84 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
85 select ARCH_INLINE_SPIN_TRYLOCK
86 select ARCH_INLINE_SPIN_TRYLOCK_BH
87 select ARCH_INLINE_SPIN_UNLOCK
88 select ARCH_INLINE_SPIN_UNLOCK_BH
89 select ARCH_INLINE_SPIN_UNLOCK_IRQ
90 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
91 select ARCH_INLINE_WRITE_LOCK
92 select ARCH_INLINE_WRITE_LOCK_BH
93 select ARCH_INLINE_WRITE_LOCK_IRQ
94 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
95 select ARCH_INLINE_WRITE_TRYLOCK
96 select ARCH_INLINE_WRITE_UNLOCK
97 select ARCH_INLINE_WRITE_UNLOCK_BH
98 select ARCH_INLINE_WRITE_UNLOCK_IRQ
99 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
100 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
101 select ARCH_SUPPORTS_ATOMIC_RMW
102 select ARCH_USE_CMPXCHG_LOCKREF
103 select ARCH_WANT_IPC_PARSE_VERSION
104 select BUILDTIME_EXTABLE_SORT
105 select CLONE_BACKWARDS2
106 select DYNAMIC_FTRACE if FUNCTION_TRACER
107 select GENERIC_CLOCKEVENTS
108 select GENERIC_CPU_AUTOPROBE
109 select GENERIC_CPU_DEVICES if !SMP
110 select GENERIC_FIND_FIRST_BIT
111 select GENERIC_SMP_IDLE_THREAD
112 select GENERIC_TIME_VSYSCALL
113 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
114 select HAVE_ARCH_AUDITSYSCALL
115 select HAVE_ARCH_JUMP_LABEL
116 select HAVE_ARCH_SECCOMP_FILTER
117 select HAVE_ARCH_TRACEHOOK
118 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
119 select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
120 select HAVE_CMPXCHG_DOUBLE
121 select HAVE_CMPXCHG_LOCAL
122 select HAVE_DEBUG_KMEMLEAK
123 select HAVE_DYNAMIC_FTRACE
124 select HAVE_DYNAMIC_FTRACE_WITH_REGS
125 select HAVE_FTRACE_MCOUNT_RECORD
126 select HAVE_FUNCTION_GRAPH_TRACER
127 select HAVE_FUNCTION_TRACER
128 select HAVE_FUTEX_CMPXCHG if FUTEX
129 select HAVE_KERNEL_BZIP2
130 select HAVE_KERNEL_GZIP
131 select HAVE_KERNEL_LZ4
132 select HAVE_KERNEL_LZMA
133 select HAVE_KERNEL_LZO
134 select HAVE_KERNEL_XZ
136 select HAVE_KRETPROBES
138 select HAVE_LIVEPATCH
140 select HAVE_MEMBLOCK_NODE_MAP
141 select HAVE_MEMBLOCK_PHYS_MAP
142 select HAVE_MOD_ARCH_SPECIFIC
144 select HAVE_PERF_EVENTS
145 select HAVE_REGS_AND_STACK_ACCESS_API
146 select HAVE_SYSCALL_TRACEPOINTS
147 select HAVE_VIRT_CPU_ACCOUNTING
148 select MODULES_USE_ELF_RELA
151 select OLD_SIGSUSPEND3
152 select SYSCTL_EXCEPTION_TRACE
154 select VIRT_CPU_ACCOUNTING
156 select ARCH_SUPPORTS_NUMA_BALANCING
157 select ARCH_WANTS_PROT_NUMA_PROT_NONE
158 select HAVE_ARCH_EARLY_PFN_TO_NID
161 config SCHED_OMIT_FRAME_POINTER
164 config PGTABLE_LEVELS
169 source "init/Kconfig"
171 source "kernel/Kconfig.freezer"
173 source "kernel/livepatch/Kconfig"
175 menu "Processor type and features"
177 config HAVE_MARCH_Z900_FEATURES
180 config HAVE_MARCH_Z990_FEATURES
182 select HAVE_MARCH_Z900_FEATURES
184 config HAVE_MARCH_Z9_109_FEATURES
186 select HAVE_MARCH_Z990_FEATURES
188 config HAVE_MARCH_Z10_FEATURES
190 select HAVE_MARCH_Z9_109_FEATURES
192 config HAVE_MARCH_Z196_FEATURES
194 select HAVE_MARCH_Z10_FEATURES
196 config HAVE_MARCH_ZEC12_FEATURES
198 select HAVE_MARCH_Z196_FEATURES
200 config HAVE_MARCH_Z13_FEATURES
202 select HAVE_MARCH_ZEC12_FEATURES
205 prompt "Processor type"
209 bool "IBM zSeries model z800 and z900"
210 select HAVE_MARCH_Z900_FEATURES
212 Select this to enable optimizations for model z800/z900 (2064 and
213 2066 series). This will enable some optimizations that are not
214 available on older ESA/390 (31 Bit) only CPUs.
217 bool "IBM zSeries model z890 and z990"
218 select HAVE_MARCH_Z990_FEATURES
220 Select this to enable optimizations for model z890/z990 (2084 and
221 2086 series). The kernel will be slightly faster but will not work
226 select HAVE_MARCH_Z9_109_FEATURES
228 Select this to enable optimizations for IBM System z9 (2094 and
229 2096 series). The kernel will be slightly faster but will not work
233 bool "IBM System z10"
234 select HAVE_MARCH_Z10_FEATURES
236 Select this to enable optimizations for IBM System z10 (2097 and
237 2098 series). The kernel will be slightly faster but will not work
241 bool "IBM zEnterprise 114 and 196"
242 select HAVE_MARCH_Z196_FEATURES
244 Select this to enable optimizations for IBM zEnterprise 114 and 196
245 (2818 and 2817 series). The kernel will be slightly faster but will
246 not work on older machines.
249 bool "IBM zBC12 and zEC12"
250 select HAVE_MARCH_ZEC12_FEATURES
252 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
253 2827 series). The kernel will be slightly faster but will not work on
258 select HAVE_MARCH_Z13_FEATURES
260 Select this to enable optimizations for IBM z13 (2964 series).
261 The kernel will be slightly faster but will not work on older
266 config MARCH_Z900_TUNE
267 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
269 config MARCH_Z990_TUNE
270 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
272 config MARCH_Z9_109_TUNE
273 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
275 config MARCH_Z10_TUNE
276 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
278 config MARCH_Z196_TUNE
279 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
281 config MARCH_ZEC12_TUNE
282 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
284 config MARCH_Z13_TUNE
285 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
288 prompt "Tune code generation"
291 Cause the compiler to tune (-mtune) the generated code for a machine.
292 This will make the code run faster on the selected machine but
293 somewhat slower on other machines.
294 This option only changes how the compiler emits instructions, not the
295 selection of instructions itself, so the resulting kernel will run on
301 Tune the generated code for the target processor for which the kernel
305 bool "IBM zSeries model z800 and z900"
308 bool "IBM zSeries model z890 and z990"
314 bool "IBM System z10"
317 bool "IBM zEnterprise 114 and 196"
320 bool "IBM zBC12 and zEC12"
332 prompt "Kernel support for 31 bit emulation"
333 select COMPAT_BINFMT_ELF if BINFMT_ELF
334 select ARCH_WANT_OLD_COMPAT_IPC
335 select COMPAT_OLD_SIGACTION
338 Select this option if you want to enable your system kernel to
339 handle system-calls from ELF binaries for 31 bit ESA. This option
340 (and some other stuff like libraries and such) is needed for
341 executing 31 bit applications. It is safe to say "Y".
343 config SYSVIPC_COMPAT
344 def_bool y if COMPAT && SYSVIPC
347 def_bool y if COMPAT && KEYS
351 prompt "Symmetric multi-processing support"
353 This enables support for systems with more than one CPU. If you have
354 a system with only one CPU, like most personal computers, say N. If
355 you have a system with more than one CPU, say Y.
357 If you say N here, the kernel will run on uni- and multiprocessor
358 machines, but will use only one CPU of a multiprocessor machine. If
359 you say Y here, the kernel will run on many, but not all,
360 uniprocessor machines. On a uniprocessor machine, the kernel
361 will run faster if you say N here.
363 See also the SMP-HOWTO available at
364 <http://www.tldp.org/docs.html#howto>.
366 Even if you don't know what to do here, say Y.
369 int "Maximum number of CPUs (2-512)"
374 This allows you to specify the maximum number of CPUs which this
375 kernel will support. The maximum supported value is 512 and the
376 minimum value which makes sense is 2.
378 This is purely to save memory - each supported CPU adds
379 approximately sixteen kilobytes to the kernel image.
383 prompt "Support for hot-pluggable CPUs"
386 Say Y here to be able to turn CPUs off and on. CPUs
387 can be controlled through /sys/devices/system/cpu/cpu#.
388 Say N if you want to disable CPU hotplug.
393 # Some NUMA nodes have memory ranges that span
394 # other nodes. Even though a pfn is valid and
395 # between a node's start and end pfns, it may not
396 # reside on that node. See memmap_init_zone()
397 # for details. <- They meant memory holes!
398 config NODES_SPAN_OTHER_NODES
403 depends on SMP && 64BIT && SCHED_TOPOLOGY
408 This option adds NUMA support to the kernel.
410 An operation mode can be selected by appending
411 numa=<method> to the kernel command line.
413 The default behaviour is identical to appending numa=plain to
414 the command line. This will create just one node with all
415 available memory and all CPUs in it.
418 int "Maximum NUMA nodes (as a power of 2)"
423 Specify the maximum number of NUMA nodes available on the target
424 system. Increases memory reserved to accommodate various tables.
426 menu "Select NUMA modes"
430 bool "NUMA emulation"
433 Numa emulation mode will split the available system memory into
434 equal chunks which then are distributed over the configured number
435 of nodes in a round-robin manner.
437 The number of fake nodes is limited by the number of available memory
438 chunks (i.e. memory size / fake size) and the number of supported
441 The CPUs are assigned to the nodes in a way that partially respects
442 the original machine topology (if supported by the machine).
443 Fair distribution of the CPUs is not guaranteed.
446 hex "NUMA emulation memory chunk size"
448 range 0x400000 0x100000000
451 Select the default size by which the memory is chopped and then
452 assigned to emulated NUMA nodes.
454 This can be overridden by specifying
458 on the kernel command line where also suffixes K, M, G, and T are
469 config SCHED_TOPOLOGY
471 prompt "Topology scheduler support"
477 Topology scheduler support improves the CPU scheduler's decision
478 making when dealing with machines that have multi-threading,
479 multiple cores or multiple books.
481 source kernel/Kconfig.preempt
483 source kernel/Kconfig.hz
489 config ARCH_SPARSEMEM_ENABLE
491 select SPARSEMEM_VMEMMAP_ENABLE
492 select SPARSEMEM_VMEMMAP
494 config ARCH_SPARSEMEM_DEFAULT
497 config ARCH_SELECT_MEMORY_MODEL
500 config ARCH_ENABLE_MEMORY_HOTPLUG
501 def_bool y if SPARSEMEM
503 config ARCH_ENABLE_MEMORY_HOTREMOVE
506 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
509 config FORCE_MAX_ZONEORDER
517 prompt "Pack kernel stack"
519 This option enables the compiler option -mkernel-backchain if it
520 is available. If the option is available the compiler supports
521 the new stack layout which dramatically reduces the minimum stack
522 frame size. With an old compiler a non-leaf function needs a
523 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
524 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
525 and 24 byte on 64 bit.
527 Say Y if you are unsure.
531 prompt "Detect kernel stack overflow"
533 This option enables the compiler option -mstack-guard and
534 -mstack-size if they are available. If the compiler supports them
535 it will emit additional code to each function prolog to trigger
536 an illegal operation if the kernel stack is about to overflow.
538 Say N if you are unsure.
541 int "Size of the guard area (128-1024)"
543 depends on CHECK_STACK
546 This allows you to specify the size of the guard area at the lower
547 end of the kernel stack. If the kernel stack points into the guard
548 area on function entry an illegal operation is triggered. The size
549 needs to be a power of 2. Please keep in mind that the size of an
550 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
551 The minimum size for the stack guard should be 256 for 31 bit and
554 config WARN_DYNAMIC_STACK
556 prompt "Emit compiler warnings for function with dynamic stack usage"
558 This option enables the compiler option -mwarn-dynamicstack. If the
559 compiler supports this options generates warnings for functions
560 that dynamically allocate stack space using alloca.
562 Say N if you are unsure.
570 prompt "QDIO support"
572 This driver provides the Queued Direct I/O base support for
575 To compile this driver as a module, choose M here: the
576 module will be called qdio.
582 select HAVE_DMA_ATTRS
589 config PCI_NR_FUNCTIONS
590 int "Maximum number of PCI functions (1-4096)"
594 This allows you to specify the maximum number of PCI functions which
595 this kernel will support.
598 int "Maximum number of MSI interrupts (64-32768)"
602 This defines the number of virtual interrupts the kernel will
603 provide for MSI interrupts. If you configure your system to have
604 too few drivers will fail to allocate MSI interrupts for all
607 source "drivers/pci/Kconfig"
608 source "drivers/pci/pcie/Kconfig"
609 source "drivers/pci/hotplug/Kconfig"
624 select HAVE_DMA_API_DEBUG
626 config NEED_SG_DMA_LENGTH
629 config NEED_DMA_MAP_STATE
634 prompt "Support for CHSC subchannels"
636 This driver allows usage of CHSC subchannels. A CHSC subchannel
637 is usually present on LPAR only.
638 The driver creates a device /dev/chsc, which may be used to
639 obtain I/O configuration information about the machine and
640 to issue asynchronous chsc commands (DANGEROUS).
641 You will usually only want to use this interface on a special
642 LPAR designated for system management.
644 To compile this driver as a module, choose M here: the
645 module will be called chsc_sch.
651 prompt "SCM bus driver"
653 Bus driver for Storage Class Memory.
657 prompt "Support for EADM subchannels"
660 This driver allows usage of EADM subchannels. EADM subchannels act
661 as a communication vehicle for SCM increments.
663 To compile this driver as a module, choose M here: the
664 module will be called eadm_sch.
671 bool "kernel crash dumps"
675 Generate crash dump after being started by kexec.
676 Crash dump kernels are loaded in the main kernel with kexec-tools
677 into a specially reserved region and then later executed after
678 a crash by kdump/kexec.
679 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
680 This option also enables s390 zfcpdump.
681 See also <file:Documentation/s390/zfcpdump.txt>
685 menu "Executable file formats / Emulations"
687 source "fs/Kconfig.binfmt"
691 prompt "Enable seccomp to safely compute untrusted bytecode"
694 This kernel feature is useful for number crunching applications
695 that may need to compute untrusted bytecode during their
696 execution. By using pipes or other transports made available to
697 the process as file descriptors supporting the read/write
698 syscalls, it's possible to isolate those applications in
699 their own address space using seccomp. Once seccomp is
700 enabled via /proc/<pid>/seccomp, it cannot be disabled
701 and the task is only allowed to execute a few safe syscalls
702 defined by each seccomp mode.
708 menu "Power Management"
710 config ARCH_HIBERNATION_POSSIBLE
713 source "kernel/power/Kconfig"
725 source "drivers/Kconfig"
729 source "arch/s390/Kconfig.debug"
731 source "security/Kconfig"
733 source "crypto/Kconfig"
737 menu "Virtualization"
741 prompt "Pseudo page fault support"
743 Select this option, if you want to use PFAULT pseudo page fault
744 handling under VM. If running native or in LPAR, this option
745 has no effect. If your VM does not support PFAULT, PAGEEX
746 pseudo page fault handling will be used.
747 Note that VM 4.2 supports PFAULT but has a bug in its
748 implementation that causes some problems.
749 Everybody who wants to run Linux under VM != VM4.2 should select
753 bool "VM shared kernel support"
754 depends on !JUMP_LABEL
756 Select this option, if you want to share the text segment of the
757 Linux kernel between different VM guests. This reduces memory
758 usage with lots of guests but greatly increases kernel size.
759 Also if a kernel was IPL'ed from a shared segment the kexec system
761 You should only select this option if you know what you are
762 doing and want to exploit this feature.
766 prompt "Cooperative memory management"
768 Select this option, if you want to enable the kernel interface
769 to reduce the memory size of the system. This is accomplished
770 by allocating pages of memory and put them "on hold". This only
771 makes sense for a system running under VM where the unused pages
772 will be reused by VM for other guest systems. The interface
773 allows an external monitor to balance memory of many systems.
774 Everybody who wants to run Linux under VM should select this
779 prompt "IUCV special message interface to cooperative memory management"
780 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
782 Select this option to enable the special message interface to
783 the cooperative memory management.
787 prompt "Linux - VM Monitor Stream, base infrastructure"
790 This provides a kernel interface for creating and updating z/VM APPLDATA
791 monitor records. The monitor records are updated at certain time
792 intervals, once the timer is started.
793 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
794 i.e. enables or disables monitoring on the Linux side.
795 A custom interval value (in seconds) can be written to
796 /proc/appldata/interval.
798 Defaults are 60 seconds interval and timer off.
799 The /proc entries can also be read from, showing the current settings.
803 prompt "Monitor memory management statistics"
804 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
806 This provides memory management related data to the Linux - VM Monitor
807 Stream, like paging/swapping rate, memory utilisation, etc.
808 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
809 APPLDATA monitor record, i.e. enables or disables monitoring this record
813 The /proc entry can also be read from, showing the current settings.
815 This can also be compiled as a module, which will be called
820 prompt "Monitor OS statistics"
821 depends on APPLDATA_BASE
823 This provides OS related data to the Linux - VM Monitor Stream, like
824 CPU utilisation, etc.
825 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
826 APPLDATA monitor record, i.e. enables or disables monitoring this record
830 This can also be compiled as a module, which will be called
833 config APPLDATA_NET_SUM
835 prompt "Monitor overall network statistics"
836 depends on APPLDATA_BASE && NET
838 This provides network related data to the Linux - VM Monitor Stream,
839 currently there is only a total sum of network I/O statistics, no
841 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
842 APPLDATA monitor record, i.e. enables or disables monitoring this record
846 This can also be compiled as a module, which will be called
851 prompt "s390 hypervisor file system support"
852 select SYS_HYPERVISOR
854 This is a virtual file system intended to provide accounting
855 information in an s390 hypervisor environment.
857 source "arch/s390/kvm/Kconfig"
861 prompt "s390 support for virtio devices"
863 select VIRTUALIZATION
865 select VIRTIO_CONSOLE
867 Enabling this option adds support for virtio based paravirtual device
870 Select this option if you want to run the kernel as a guest under