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_GCOV_PROFILE_ALL
69 select ARCH_HAS_SG_CHAIN
70 select ARCH_HAVE_NMI_SAFE_CMPXCHG
71 select ARCH_INLINE_READ_LOCK
72 select ARCH_INLINE_READ_LOCK_BH
73 select ARCH_INLINE_READ_LOCK_IRQ
74 select ARCH_INLINE_READ_LOCK_IRQSAVE
75 select ARCH_INLINE_READ_TRYLOCK
76 select ARCH_INLINE_READ_UNLOCK
77 select ARCH_INLINE_READ_UNLOCK_BH
78 select ARCH_INLINE_READ_UNLOCK_IRQ
79 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
80 select ARCH_INLINE_SPIN_LOCK
81 select ARCH_INLINE_SPIN_LOCK_BH
82 select ARCH_INLINE_SPIN_LOCK_IRQ
83 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
84 select ARCH_INLINE_SPIN_TRYLOCK
85 select ARCH_INLINE_SPIN_TRYLOCK_BH
86 select ARCH_INLINE_SPIN_UNLOCK
87 select ARCH_INLINE_SPIN_UNLOCK_BH
88 select ARCH_INLINE_SPIN_UNLOCK_IRQ
89 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
90 select ARCH_INLINE_WRITE_LOCK
91 select ARCH_INLINE_WRITE_LOCK_BH
92 select ARCH_INLINE_WRITE_LOCK_IRQ
93 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
94 select ARCH_INLINE_WRITE_TRYLOCK
95 select ARCH_INLINE_WRITE_UNLOCK
96 select ARCH_INLINE_WRITE_UNLOCK_BH
97 select ARCH_INLINE_WRITE_UNLOCK_IRQ
98 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
99 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
100 select ARCH_SUPPORTS_ATOMIC_RMW
101 select ARCH_USE_CMPXCHG_LOCKREF
102 select ARCH_WANT_IPC_PARSE_VERSION
103 select BUILDTIME_EXTABLE_SORT
104 select CLONE_BACKWARDS2
105 select DYNAMIC_FTRACE if FUNCTION_TRACER
106 select GENERIC_CLOCKEVENTS
107 select GENERIC_CPU_DEVICES if !SMP
108 select GENERIC_FIND_FIRST_BIT
109 select GENERIC_SMP_IDLE_THREAD
110 select GENERIC_TIME_VSYSCALL
111 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
112 select HAVE_ARCH_AUDITSYSCALL
113 select HAVE_ARCH_JUMP_LABEL
114 select HAVE_ARCH_SECCOMP_FILTER
115 select HAVE_ARCH_TRACEHOOK
116 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
117 select HAVE_BPF_JIT if PACK_STACK
118 select HAVE_CMPXCHG_DOUBLE
119 select HAVE_CMPXCHG_LOCAL
120 select HAVE_DEBUG_KMEMLEAK
121 select HAVE_DYNAMIC_FTRACE
122 select HAVE_DYNAMIC_FTRACE_WITH_REGS
123 select HAVE_FTRACE_MCOUNT_RECORD
124 select HAVE_FUNCTION_GRAPH_TRACER
125 select HAVE_FUNCTION_TRACER
126 select HAVE_FUTEX_CMPXCHG if FUTEX
127 select HAVE_KERNEL_BZIP2
128 select HAVE_KERNEL_GZIP
129 select HAVE_KERNEL_LZ4
130 select HAVE_KERNEL_LZMA
131 select HAVE_KERNEL_LZO
132 select HAVE_KERNEL_XZ
134 select HAVE_KRETPROBES
137 select HAVE_MEMBLOCK_NODE_MAP
138 select HAVE_MEMBLOCK_PHYS_MAP
139 select HAVE_MOD_ARCH_SPECIFIC
141 select HAVE_PERF_EVENTS
142 select HAVE_REGS_AND_STACK_ACCESS_API
143 select HAVE_SYSCALL_TRACEPOINTS
144 select HAVE_VIRT_CPU_ACCOUNTING
145 select MODULES_USE_ELF_RELA
148 select OLD_SIGSUSPEND3
149 select SYSCTL_EXCEPTION_TRACE
151 select VIRT_CPU_ACCOUNTING
154 config SCHED_OMIT_FRAME_POINTER
157 source "init/Kconfig"
159 source "kernel/Kconfig.freezer"
161 menu "Processor type and features"
163 config HAVE_MARCH_Z900_FEATURES
166 config HAVE_MARCH_Z990_FEATURES
168 select HAVE_MARCH_Z900_FEATURES
170 config HAVE_MARCH_Z9_109_FEATURES
172 select HAVE_MARCH_Z990_FEATURES
174 config HAVE_MARCH_Z10_FEATURES
176 select HAVE_MARCH_Z9_109_FEATURES
178 config HAVE_MARCH_Z196_FEATURES
180 select HAVE_MARCH_Z10_FEATURES
182 config HAVE_MARCH_ZEC12_FEATURES
184 select HAVE_MARCH_Z196_FEATURES
186 config HAVE_MARCH_Z13_FEATURES
188 select HAVE_MARCH_ZEC12_FEATURES
191 prompt "Processor type"
195 bool "IBM zSeries model z800 and z900"
196 select HAVE_MARCH_Z900_FEATURES
198 Select this to enable optimizations for model z800/z900 (2064 and
199 2066 series). This will enable some optimizations that are not
200 available on older ESA/390 (31 Bit) only CPUs.
203 bool "IBM zSeries model z890 and z990"
204 select HAVE_MARCH_Z990_FEATURES
206 Select this to enable optimizations for model z890/z990 (2084 and
207 2086 series). The kernel will be slightly faster but will not work
212 select HAVE_MARCH_Z9_109_FEATURES
214 Select this to enable optimizations for IBM System z9 (2094 and
215 2096 series). The kernel will be slightly faster but will not work
219 bool "IBM System z10"
220 select HAVE_MARCH_Z10_FEATURES
222 Select this to enable optimizations for IBM System z10 (2097 and
223 2098 series). The kernel will be slightly faster but will not work
227 bool "IBM zEnterprise 114 and 196"
228 select HAVE_MARCH_Z196_FEATURES
230 Select this to enable optimizations for IBM zEnterprise 114 and 196
231 (2818 and 2817 series). The kernel will be slightly faster but will
232 not work on older machines.
235 bool "IBM zBC12 and zEC12"
236 select HAVE_MARCH_ZEC12_FEATURES
238 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
239 2827 series). The kernel will be slightly faster but will not work on
244 select HAVE_MARCH_Z13_FEATURES
246 Select this to enable optimizations for IBM z13 (2964 series).
247 The kernel will be slightly faster but will not work on older
252 config MARCH_Z900_TUNE
253 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
255 config MARCH_Z990_TUNE
256 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
258 config MARCH_Z9_109_TUNE
259 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
261 config MARCH_Z10_TUNE
262 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
264 config MARCH_Z196_TUNE
265 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
267 config MARCH_ZEC12_TUNE
268 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
270 config MARCH_Z13_TUNE
271 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
274 prompt "Tune code generation"
277 Cause the compiler to tune (-mtune) the generated code for a machine.
278 This will make the code run faster on the selected machine but
279 somewhat slower on other machines.
280 This option only changes how the compiler emits instructions, not the
281 selection of instructions itself, so the resulting kernel will run on
287 Tune the generated code for the target processor for which the kernel
291 bool "IBM zSeries model z800 and z900"
294 bool "IBM zSeries model z890 and z990"
300 bool "IBM System z10"
303 bool "IBM zEnterprise 114 and 196"
306 bool "IBM zBC12 and zEC12"
318 prompt "Kernel support for 31 bit emulation"
319 select COMPAT_BINFMT_ELF if BINFMT_ELF
320 select ARCH_WANT_OLD_COMPAT_IPC
321 select COMPAT_OLD_SIGACTION
323 Select this option if you want to enable your system kernel to
324 handle system-calls from ELF binaries for 31 bit ESA. This option
325 (and some other stuff like libraries and such) is needed for
326 executing 31 bit applications. It is safe to say "Y".
328 config SYSVIPC_COMPAT
329 def_bool y if COMPAT && SYSVIPC
332 def_bool y if COMPAT && KEYS
336 prompt "Symmetric multi-processing support"
338 This enables support for systems with more than one CPU. If you have
339 a system with only one CPU, like most personal computers, say N. If
340 you have a system with more than one CPU, say Y.
342 If you say N here, the kernel will run on uni- and multiprocessor
343 machines, but will use only one CPU of a multiprocessor machine. If
344 you say Y here, the kernel will run on many, but not all,
345 uniprocessor machines. On a uniprocessor machine, the kernel
346 will run faster if you say N here.
348 See also the SMP-HOWTO available at
349 <http://www.tldp.org/docs.html#howto>.
351 Even if you don't know what to do here, say Y.
354 int "Maximum number of CPUs (2-512)"
359 This allows you to specify the maximum number of CPUs which this
360 kernel will support. The maximum supported value is 512 and the
361 minimum value which makes sense is 2.
363 This is purely to save memory - each supported CPU adds
364 approximately sixteen kilobytes to the kernel image.
368 prompt "Support for hot-pluggable CPUs"
371 Say Y here to be able to turn CPUs off and on. CPUs
372 can be controlled through /sys/devices/system/cpu/cpu#.
373 Say N if you want to disable CPU hotplug.
384 config SCHED_TOPOLOGY
386 prompt "Topology scheduler support"
392 Topology scheduler support improves the CPU scheduler's decision
393 making when dealing with machines that have multi-threading,
394 multiple cores or multiple books.
396 source kernel/Kconfig.preempt
398 source kernel/Kconfig.hz
404 config ARCH_SPARSEMEM_ENABLE
406 select SPARSEMEM_VMEMMAP_ENABLE
407 select SPARSEMEM_VMEMMAP
409 config ARCH_SPARSEMEM_DEFAULT
412 config ARCH_SELECT_MEMORY_MODEL
415 config ARCH_ENABLE_MEMORY_HOTPLUG
416 def_bool y if SPARSEMEM
418 config ARCH_ENABLE_MEMORY_HOTREMOVE
421 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
424 config FORCE_MAX_ZONEORDER
432 prompt "Pack kernel stack"
434 This option enables the compiler option -mkernel-backchain if it
435 is available. If the option is available the compiler supports
436 the new stack layout which dramatically reduces the minimum stack
437 frame size. With an old compiler a non-leaf function needs a
438 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
439 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
440 and 24 byte on 64 bit.
442 Say Y if you are unsure.
446 prompt "Detect kernel stack overflow"
448 This option enables the compiler option -mstack-guard and
449 -mstack-size if they are available. If the compiler supports them
450 it will emit additional code to each function prolog to trigger
451 an illegal operation if the kernel stack is about to overflow.
453 Say N if you are unsure.
456 int "Size of the guard area (128-1024)"
458 depends on CHECK_STACK
461 This allows you to specify the size of the guard area at the lower
462 end of the kernel stack. If the kernel stack points into the guard
463 area on function entry an illegal operation is triggered. The size
464 needs to be a power of 2. Please keep in mind that the size of an
465 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
466 The minimum size for the stack guard should be 256 for 31 bit and
469 config WARN_DYNAMIC_STACK
471 prompt "Emit compiler warnings for function with dynamic stack usage"
473 This option enables the compiler option -mwarn-dynamicstack. If the
474 compiler supports this options generates warnings for functions
475 that dynamically allocate stack space using alloca.
477 Say N if you are unsure.
485 prompt "QDIO support"
487 This driver provides the Queued Direct I/O base support for
490 To compile this driver as a module, choose M here: the
491 module will be called qdio.
497 select HAVE_DMA_ATTRS
504 config PCI_NR_FUNCTIONS
505 int "Maximum number of PCI functions (1-4096)"
509 This allows you to specify the maximum number of PCI functions which
510 this kernel will support.
513 int "Maximum number of MSI interrupts (64-32768)"
517 This defines the number of virtual interrupts the kernel will
518 provide for MSI interrupts. If you configure your system to have
519 too few drivers will fail to allocate MSI interrupts for all
522 source "drivers/pci/Kconfig"
523 source "drivers/pci/pcie/Kconfig"
524 source "drivers/pci/hotplug/Kconfig"
539 select HAVE_DMA_API_DEBUG
541 config NEED_SG_DMA_LENGTH
544 config NEED_DMA_MAP_STATE
549 prompt "Support for CHSC subchannels"
551 This driver allows usage of CHSC subchannels. A CHSC subchannel
552 is usually present on LPAR only.
553 The driver creates a device /dev/chsc, which may be used to
554 obtain I/O configuration information about the machine and
555 to issue asynchronous chsc commands (DANGEROUS).
556 You will usually only want to use this interface on a special
557 LPAR designated for system management.
559 To compile this driver as a module, choose M here: the
560 module will be called chsc_sch.
566 prompt "SCM bus driver"
568 Bus driver for Storage Class Memory.
572 prompt "Support for EADM subchannels"
575 This driver allows usage of EADM subchannels. EADM subchannels act
576 as a communication vehicle for SCM increments.
578 To compile this driver as a module, choose M here: the
579 module will be called eadm_sch.
586 bool "kernel crash dumps"
590 Generate crash dump after being started by kexec.
591 Crash dump kernels are loaded in the main kernel with kexec-tools
592 into a specially reserved region and then later executed after
593 a crash by kdump/kexec.
594 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
595 This option also enables s390 zfcpdump.
596 See also <file:Documentation/s390/zfcpdump.txt>
600 menu "Executable file formats / Emulations"
602 source "fs/Kconfig.binfmt"
606 prompt "Enable seccomp to safely compute untrusted bytecode"
609 This kernel feature is useful for number crunching applications
610 that may need to compute untrusted bytecode during their
611 execution. By using pipes or other transports made available to
612 the process as file descriptors supporting the read/write
613 syscalls, it's possible to isolate those applications in
614 their own address space using seccomp. Once seccomp is
615 enabled via /proc/<pid>/seccomp, it cannot be disabled
616 and the task is only allowed to execute a few safe syscalls
617 defined by each seccomp mode.
623 menu "Power Management"
625 config ARCH_HIBERNATION_POSSIBLE
628 source "kernel/power/Kconfig"
640 source "drivers/Kconfig"
644 source "arch/s390/Kconfig.debug"
646 source "security/Kconfig"
648 source "crypto/Kconfig"
652 menu "Virtualization"
656 prompt "Pseudo page fault support"
658 Select this option, if you want to use PFAULT pseudo page fault
659 handling under VM. If running native or in LPAR, this option
660 has no effect. If your VM does not support PFAULT, PAGEEX
661 pseudo page fault handling will be used.
662 Note that VM 4.2 supports PFAULT but has a bug in its
663 implementation that causes some problems.
664 Everybody who wants to run Linux under VM != VM4.2 should select
668 bool "VM shared kernel support"
669 depends on !JUMP_LABEL
671 Select this option, if you want to share the text segment of the
672 Linux kernel between different VM guests. This reduces memory
673 usage with lots of guests but greatly increases kernel size.
674 Also if a kernel was IPL'ed from a shared segment the kexec system
676 You should only select this option if you know what you are
677 doing and want to exploit this feature.
681 prompt "Cooperative memory management"
683 Select this option, if you want to enable the kernel interface
684 to reduce the memory size of the system. This is accomplished
685 by allocating pages of memory and put them "on hold". This only
686 makes sense for a system running under VM where the unused pages
687 will be reused by VM for other guest systems. The interface
688 allows an external monitor to balance memory of many systems.
689 Everybody who wants to run Linux under VM should select this
694 prompt "IUCV special message interface to cooperative memory management"
695 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
697 Select this option to enable the special message interface to
698 the cooperative memory management.
702 prompt "Linux - VM Monitor Stream, base infrastructure"
705 This provides a kernel interface for creating and updating z/VM APPLDATA
706 monitor records. The monitor records are updated at certain time
707 intervals, once the timer is started.
708 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
709 i.e. enables or disables monitoring on the Linux side.
710 A custom interval value (in seconds) can be written to
711 /proc/appldata/interval.
713 Defaults are 60 seconds interval and timer off.
714 The /proc entries can also be read from, showing the current settings.
718 prompt "Monitor memory management statistics"
719 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
721 This provides memory management related data to the Linux - VM Monitor
722 Stream, like paging/swapping rate, memory utilisation, etc.
723 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
724 APPLDATA monitor record, i.e. enables or disables monitoring this record
728 The /proc entry can also be read from, showing the current settings.
730 This can also be compiled as a module, which will be called
735 prompt "Monitor OS statistics"
736 depends on APPLDATA_BASE
738 This provides OS related data to the Linux - VM Monitor Stream, like
739 CPU utilisation, etc.
740 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
741 APPLDATA monitor record, i.e. enables or disables monitoring this record
745 This can also be compiled as a module, which will be called
748 config APPLDATA_NET_SUM
750 prompt "Monitor overall network statistics"
751 depends on APPLDATA_BASE && NET
753 This provides network related data to the Linux - VM Monitor Stream,
754 currently there is only a total sum of network I/O statistics, no
756 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
757 APPLDATA monitor record, i.e. enables or disables monitoring this record
761 This can also be compiled as a module, which will be called
766 prompt "s390 hypervisor file system support"
767 select SYS_HYPERVISOR
769 This is a virtual file system intended to provide accounting
770 information in an s390 hypervisor environment.
772 source "arch/s390/kvm/Kconfig"
776 prompt "s390 support for virtio devices"
778 select VIRTUALIZATION
780 select VIRTIO_CONSOLE
782 Enabling this option adds support for virtio based paravirtual device
785 Select this option if you want to run the kernel as a guest under