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
62 config ARCH_SUPPORTS_UPROBES
70 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
71 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
72 select ARCH_HAS_ELF_RANDOMIZE
73 select ARCH_HAS_GCOV_PROFILE_ALL
74 select ARCH_HAS_SG_CHAIN
75 select ARCH_HAVE_NMI_SAFE_CMPXCHG
76 select ARCH_INLINE_READ_LOCK
77 select ARCH_INLINE_READ_LOCK_BH
78 select ARCH_INLINE_READ_LOCK_IRQ
79 select ARCH_INLINE_READ_LOCK_IRQSAVE
80 select ARCH_INLINE_READ_TRYLOCK
81 select ARCH_INLINE_READ_UNLOCK
82 select ARCH_INLINE_READ_UNLOCK_BH
83 select ARCH_INLINE_READ_UNLOCK_IRQ
84 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
85 select ARCH_INLINE_SPIN_LOCK
86 select ARCH_INLINE_SPIN_LOCK_BH
87 select ARCH_INLINE_SPIN_LOCK_IRQ
88 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
89 select ARCH_INLINE_SPIN_TRYLOCK
90 select ARCH_INLINE_SPIN_TRYLOCK_BH
91 select ARCH_INLINE_SPIN_UNLOCK
92 select ARCH_INLINE_SPIN_UNLOCK_BH
93 select ARCH_INLINE_SPIN_UNLOCK_IRQ
94 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
95 select ARCH_INLINE_WRITE_LOCK
96 select ARCH_INLINE_WRITE_LOCK_BH
97 select ARCH_INLINE_WRITE_LOCK_IRQ
98 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
99 select ARCH_INLINE_WRITE_TRYLOCK
100 select ARCH_INLINE_WRITE_UNLOCK
101 select ARCH_INLINE_WRITE_UNLOCK_BH
102 select ARCH_INLINE_WRITE_UNLOCK_IRQ
103 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
104 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
105 select ARCH_SUPPORTS_ATOMIC_RMW
106 select ARCH_SUPPORTS_NUMA_BALANCING
107 select ARCH_USE_BUILTIN_BSWAP
108 select ARCH_USE_CMPXCHG_LOCKREF
109 select ARCH_WANTS_PROT_NUMA_PROT_NONE
110 select ARCH_WANT_IPC_PARSE_VERSION
111 select BUILDTIME_EXTABLE_SORT
112 select CLONE_BACKWARDS2
113 select DYNAMIC_FTRACE if FUNCTION_TRACER
114 select GENERIC_CLOCKEVENTS
115 select GENERIC_CPU_AUTOPROBE
116 select GENERIC_CPU_DEVICES if !SMP
117 select GENERIC_FIND_FIRST_BIT
118 select GENERIC_SMP_IDLE_THREAD
119 select GENERIC_TIME_VSYSCALL
120 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
121 select HAVE_ARCH_AUDITSYSCALL
122 select HAVE_ARCH_EARLY_PFN_TO_NID
123 select HAVE_ARCH_HARDENED_USERCOPY
124 select HAVE_ARCH_JUMP_LABEL
125 select HAVE_ARCH_SECCOMP_FILTER
126 select HAVE_ARCH_SOFT_DIRTY
127 select HAVE_ARCH_TRACEHOOK
128 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
129 select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
130 select HAVE_CMPXCHG_DOUBLE
131 select HAVE_CMPXCHG_LOCAL
132 select HAVE_DEBUG_KMEMLEAK
133 select HAVE_DYNAMIC_FTRACE
134 select HAVE_DYNAMIC_FTRACE_WITH_REGS
135 select HAVE_FTRACE_MCOUNT_RECORD
136 select HAVE_FUNCTION_GRAPH_TRACER
137 select HAVE_FUNCTION_TRACER
138 select HAVE_FUTEX_CMPXCHG if FUTEX
139 select HAVE_KERNEL_BZIP2
140 select HAVE_KERNEL_GZIP
141 select HAVE_KERNEL_LZ4
142 select HAVE_KERNEL_LZMA
143 select HAVE_KERNEL_LZO
144 select HAVE_KERNEL_XZ
146 select HAVE_KRETPROBES
148 select HAVE_LIVEPATCH
150 select HAVE_MEMBLOCK_NODE_MAP
151 select HAVE_MEMBLOCK_PHYS_MAP
152 select HAVE_MOD_ARCH_SPECIFIC
154 select HAVE_PERF_EVENTS
155 select HAVE_REGS_AND_STACK_ACCESS_API
156 select HAVE_SYSCALL_TRACEPOINTS
157 select HAVE_VIRT_CPU_ACCOUNTING
158 select MODULES_USE_ELF_RELA
161 select OLD_SIGSUSPEND3
162 select SYSCTL_EXCEPTION_TRACE
164 select VIRT_CPU_ACCOUNTING
168 config SCHED_OMIT_FRAME_POINTER
171 config PGTABLE_LEVELS
176 source "init/Kconfig"
178 source "kernel/Kconfig.freezer"
180 source "kernel/livepatch/Kconfig"
182 menu "Processor type and features"
184 config HAVE_MARCH_Z900_FEATURES
187 config HAVE_MARCH_Z990_FEATURES
189 select HAVE_MARCH_Z900_FEATURES
191 config HAVE_MARCH_Z9_109_FEATURES
193 select HAVE_MARCH_Z990_FEATURES
195 config HAVE_MARCH_Z10_FEATURES
197 select HAVE_MARCH_Z9_109_FEATURES
199 config HAVE_MARCH_Z196_FEATURES
201 select HAVE_MARCH_Z10_FEATURES
203 config HAVE_MARCH_ZEC12_FEATURES
205 select HAVE_MARCH_Z196_FEATURES
207 config HAVE_MARCH_Z13_FEATURES
209 select HAVE_MARCH_ZEC12_FEATURES
212 prompt "Processor type"
216 bool "IBM zSeries model z800 and z900"
217 select HAVE_MARCH_Z900_FEATURES
219 Select this to enable optimizations for model z800/z900 (2064 and
220 2066 series). This will enable some optimizations that are not
221 available on older ESA/390 (31 Bit) only CPUs.
224 bool "IBM zSeries model z890 and z990"
225 select HAVE_MARCH_Z990_FEATURES
227 Select this to enable optimizations for model z890/z990 (2084 and
228 2086 series). The kernel will be slightly faster but will not work
233 select HAVE_MARCH_Z9_109_FEATURES
235 Select this to enable optimizations for IBM System z9 (2094 and
236 2096 series). The kernel will be slightly faster but will not work
240 bool "IBM System z10"
241 select HAVE_MARCH_Z10_FEATURES
243 Select this to enable optimizations for IBM System z10 (2097 and
244 2098 series). The kernel will be slightly faster but will not work
248 bool "IBM zEnterprise 114 and 196"
249 select HAVE_MARCH_Z196_FEATURES
251 Select this to enable optimizations for IBM zEnterprise 114 and 196
252 (2818 and 2817 series). The kernel will be slightly faster but will
253 not work on older machines.
256 bool "IBM zBC12 and zEC12"
257 select HAVE_MARCH_ZEC12_FEATURES
259 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
260 2827 series). The kernel will be slightly faster but will not work on
265 select HAVE_MARCH_Z13_FEATURES
267 Select this to enable optimizations for IBM z13 (2964 series).
268 The kernel will be slightly faster but will not work on older
273 config MARCH_Z900_TUNE
274 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
276 config MARCH_Z990_TUNE
277 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
279 config MARCH_Z9_109_TUNE
280 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
282 config MARCH_Z10_TUNE
283 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
285 config MARCH_Z196_TUNE
286 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
288 config MARCH_ZEC12_TUNE
289 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
291 config MARCH_Z13_TUNE
292 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
295 prompt "Tune code generation"
298 Cause the compiler to tune (-mtune) the generated code for a machine.
299 This will make the code run faster on the selected machine but
300 somewhat slower on other machines.
301 This option only changes how the compiler emits instructions, not the
302 selection of instructions itself, so the resulting kernel will run on
308 Tune the generated code for the target processor for which the kernel
312 bool "IBM zSeries model z800 and z900"
315 bool "IBM zSeries model z890 and z990"
321 bool "IBM System z10"
324 bool "IBM zEnterprise 114 and 196"
327 bool "IBM zBC12 and zEC12"
339 prompt "Kernel support for 31 bit emulation"
340 select COMPAT_BINFMT_ELF if BINFMT_ELF
341 select ARCH_WANT_OLD_COMPAT_IPC
342 select COMPAT_OLD_SIGACTION
345 Select this option if you want to enable your system kernel to
346 handle system-calls from ELF binaries for 31 bit ESA. This option
347 (and some other stuff like libraries and such) is needed for
348 executing 31 bit applications. It is safe to say "Y".
350 config SYSVIPC_COMPAT
351 def_bool y if COMPAT && SYSVIPC
354 def_bool y if COMPAT && KEYS
358 prompt "Symmetric multi-processing support"
360 This enables support for systems with more than one CPU. If you have
361 a system with only one CPU, like most personal computers, say N. If
362 you have a system with more than one CPU, say Y.
364 If you say N here, the kernel will run on uni- and multiprocessor
365 machines, but will use only one CPU of a multiprocessor machine. If
366 you say Y here, the kernel will run on many, but not all,
367 uniprocessor machines. On a uniprocessor machine, the kernel
368 will run faster if you say N here.
370 See also the SMP-HOWTO available at
371 <http://www.tldp.org/docs.html#howto>.
373 Even if you don't know what to do here, say Y.
376 int "Maximum number of CPUs (2-512)"
381 This allows you to specify the maximum number of CPUs which this
382 kernel will support. The maximum supported value is 512 and the
383 minimum value which makes sense is 2.
385 This is purely to save memory - each supported CPU adds
386 approximately sixteen kilobytes to the kernel image.
390 prompt "Support for hot-pluggable CPUs"
393 Say Y here to be able to turn CPUs off and on. CPUs
394 can be controlled through /sys/devices/system/cpu/cpu#.
395 Say N if you want to disable CPU hotplug.
400 # Some NUMA nodes have memory ranges that span
401 # other nodes. Even though a pfn is valid and
402 # between a node's start and end pfns, it may not
403 # reside on that node. See memmap_init_zone()
404 # for details. <- They meant memory holes!
405 config NODES_SPAN_OTHER_NODES
410 depends on SMP && 64BIT && SCHED_TOPOLOGY
415 This option adds NUMA support to the kernel.
417 An operation mode can be selected by appending
418 numa=<method> to the kernel command line.
420 The default behaviour is identical to appending numa=plain to
421 the command line. This will create just one node with all
422 available memory and all CPUs in it.
425 int "Maximum NUMA nodes (as a power of 2)"
430 Specify the maximum number of NUMA nodes available on the target
431 system. Increases memory reserved to accommodate various tables.
433 menu "Select NUMA modes"
437 bool "NUMA emulation"
440 Numa emulation mode will split the available system memory into
441 equal chunks which then are distributed over the configured number
442 of nodes in a round-robin manner.
444 The number of fake nodes is limited by the number of available memory
445 chunks (i.e. memory size / fake size) and the number of supported
448 The CPUs are assigned to the nodes in a way that partially respects
449 the original machine topology (if supported by the machine).
450 Fair distribution of the CPUs is not guaranteed.
453 hex "NUMA emulation memory chunk size"
455 range 0x400000 0x100000000
458 Select the default size by which the memory is chopped and then
459 assigned to emulated NUMA nodes.
461 This can be overridden by specifying
465 on the kernel command line where also suffixes K, M, G, and T are
476 config SCHED_TOPOLOGY
478 prompt "Topology scheduler support"
484 Topology scheduler support improves the CPU scheduler's decision
485 making when dealing with machines that have multi-threading,
486 multiple cores or multiple books.
488 source kernel/Kconfig.preempt
490 source kernel/Kconfig.hz
496 config ARCH_SPARSEMEM_ENABLE
498 select SPARSEMEM_VMEMMAP_ENABLE
499 select SPARSEMEM_VMEMMAP
501 config ARCH_SPARSEMEM_DEFAULT
504 config ARCH_SELECT_MEMORY_MODEL
507 config ARCH_ENABLE_MEMORY_HOTPLUG
508 def_bool y if SPARSEMEM
510 config ARCH_ENABLE_MEMORY_HOTREMOVE
513 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
516 config FORCE_MAX_ZONEORDER
524 prompt "Pack kernel stack"
526 This option enables the compiler option -mkernel-backchain if it
527 is available. If the option is available the compiler supports
528 the new stack layout which dramatically reduces the minimum stack
529 frame size. With an old compiler a non-leaf function needs a
530 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
531 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
532 and 24 byte on 64 bit.
534 Say Y if you are unsure.
538 prompt "Detect kernel stack overflow"
540 This option enables the compiler option -mstack-guard and
541 -mstack-size if they are available. If the compiler supports them
542 it will emit additional code to each function prolog to trigger
543 an illegal operation if the kernel stack is about to overflow.
545 Say N if you are unsure.
548 int "Size of the guard area (128-1024)"
550 depends on CHECK_STACK
553 This allows you to specify the size of the guard area at the lower
554 end of the kernel stack. If the kernel stack points into the guard
555 area on function entry an illegal operation is triggered. The size
556 needs to be a power of 2. Please keep in mind that the size of an
557 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
558 The minimum size for the stack guard should be 256 for 31 bit and
561 config WARN_DYNAMIC_STACK
563 prompt "Emit compiler warnings for function with dynamic stack usage"
565 This option enables the compiler option -mwarn-dynamicstack. If the
566 compiler supports this options generates warnings for functions
567 that dynamically allocate stack space using alloca.
569 Say N if you are unsure.
577 prompt "QDIO support"
579 This driver provides the Queued Direct I/O base support for
582 To compile this driver as a module, choose M here: the
583 module will be called qdio.
589 select HAVE_DMA_ATTRS
597 config PCI_NR_FUNCTIONS
598 int "Maximum number of PCI functions (1-4096)"
602 This allows you to specify the maximum number of PCI functions which
603 this kernel will support.
606 int "Maximum number of MSI interrupts (64-32768)"
610 This defines the number of virtual interrupts the kernel will
611 provide for MSI interrupts. If you configure your system to have
612 too few drivers will fail to allocate MSI interrupts for all
615 source "drivers/pci/Kconfig"
616 source "drivers/pci/pcie/Kconfig"
617 source "drivers/pci/hotplug/Kconfig"
632 select HAVE_DMA_API_DEBUG
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