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 if !MARCH_G5
114 select HAVE_ARCH_SECCOMP_FILTER
115 select HAVE_ARCH_TRACEHOOK
116 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
117 select HAVE_BPF_JIT if 64BIT && PACK_STACK
118 select HAVE_CMPXCHG_DOUBLE
119 select HAVE_CMPXCHG_LOCAL
120 select HAVE_DEBUG_KMEMLEAK
121 select HAVE_DYNAMIC_FTRACE if 64BIT
122 select HAVE_DYNAMIC_FTRACE_WITH_REGS if 64BIT
123 select HAVE_FTRACE_MCOUNT_RECORD
124 select HAVE_FUNCTION_GRAPH_TRACER if 64BIT
125 select HAVE_FUNCTION_TRACER if 64BIT
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
135 select HAVE_KVM if 64BIT
136 select HAVE_LIVEPATCH
138 select HAVE_MEMBLOCK_NODE_MAP
139 select HAVE_MEMBLOCK_PHYS_MAP
140 select HAVE_MOD_ARCH_SPECIFIC
142 select HAVE_PERF_EVENTS
143 select HAVE_REGS_AND_STACK_ACCESS_API
144 select HAVE_SYSCALL_TRACEPOINTS
145 select HAVE_UID16 if 32BIT
146 select HAVE_VIRT_CPU_ACCOUNTING
147 select MODULES_USE_ELF_RELA
150 select OLD_SIGSUSPEND3
151 select SYSCTL_EXCEPTION_TRACE
153 select VIRT_CPU_ACCOUNTING
156 config SCHED_OMIT_FRAME_POINTER
159 source "init/Kconfig"
161 source "kernel/Kconfig.freezer"
163 source "kernel/livepatch/Kconfig"
165 menu "Processor type and features"
167 config HAVE_MARCH_Z900_FEATURES
170 config HAVE_MARCH_Z990_FEATURES
172 select HAVE_MARCH_Z900_FEATURES
174 config HAVE_MARCH_Z9_109_FEATURES
176 select HAVE_MARCH_Z990_FEATURES
178 config HAVE_MARCH_Z10_FEATURES
180 select HAVE_MARCH_Z9_109_FEATURES
182 config HAVE_MARCH_Z196_FEATURES
184 select HAVE_MARCH_Z10_FEATURES
186 config HAVE_MARCH_ZEC12_FEATURES
188 select HAVE_MARCH_Z196_FEATURES
190 config HAVE_MARCH_Z13_FEATURES
192 select HAVE_MARCH_ZEC12_FEATURES
195 prompt "Processor type"
199 bool "System/390 model G5 and G6"
202 Select this to build a 31 bit kernel that works
203 on all ESA/390 and z/Architecture machines.
206 bool "IBM zSeries model z800 and z900"
207 select HAVE_MARCH_Z900_FEATURES if 64BIT
209 Select this to enable optimizations for model z800/z900 (2064 and
210 2066 series). This will enable some optimizations that are not
211 available on older ESA/390 (31 Bit) only CPUs.
214 bool "IBM zSeries model z890 and z990"
215 select HAVE_MARCH_Z990_FEATURES if 64BIT
217 Select this to enable optimizations for model z890/z990 (2084 and
218 2086 series). The kernel will be slightly faster but will not work
223 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
225 Select this to enable optimizations for IBM System z9 (2094 and
226 2096 series). The kernel will be slightly faster but will not work
230 bool "IBM System z10"
231 select HAVE_MARCH_Z10_FEATURES if 64BIT
233 Select this to enable optimizations for IBM System z10 (2097 and
234 2098 series). The kernel will be slightly faster but will not work
238 bool "IBM zEnterprise 114 and 196"
239 select HAVE_MARCH_Z196_FEATURES if 64BIT
241 Select this to enable optimizations for IBM zEnterprise 114 and 196
242 (2818 and 2817 series). The kernel will be slightly faster but will
243 not work on older machines.
246 bool "IBM zBC12 and zEC12"
247 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
249 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
250 2827 series). The kernel will be slightly faster but will not work on
255 select HAVE_MARCH_Z13_FEATURES if 64BIT
257 Select this to enable optimizations for IBM z13 (2964 series).
258 The kernel will be slightly faster but will not work on older
264 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
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 "System/390 model G5 and G6"
308 bool "IBM zSeries model z800 and z900"
311 bool "IBM zSeries model z890 and z990"
317 bool "IBM System z10"
320 bool "IBM zEnterprise 114 and 196"
323 bool "IBM zBC12 and zEC12"
332 prompt "64 bit kernel"
334 Select this option if you have an IBM z/Architecture machine
335 and want to use the 64 bit addressing mode.
342 prompt "Kernel support for 31 bit emulation"
344 select COMPAT_BINFMT_ELF if BINFMT_ELF
345 select ARCH_WANT_OLD_COMPAT_IPC
346 select COMPAT_OLD_SIGACTION
348 Select this option if you want to enable your system kernel to
349 handle system-calls from ELF binaries for 31 bit ESA. This option
350 (and some other stuff like libraries and such) is needed for
351 executing 31 bit applications. It is safe to say "Y".
353 config SYSVIPC_COMPAT
354 def_bool y if COMPAT && SYSVIPC
357 def_bool y if COMPAT && KEYS
361 prompt "Symmetric multi-processing support"
363 This enables support for systems with more than one CPU. If you have
364 a system with only one CPU, like most personal computers, say N. If
365 you have a system with more than one CPU, say Y.
367 If you say N here, the kernel will run on uni- and multiprocessor
368 machines, but will use only one CPU of a multiprocessor machine. If
369 you say Y here, the kernel will run on many, but not all,
370 uniprocessor machines. On a uniprocessor machine, the kernel
371 will run faster if you say N here.
373 See also the SMP-HOWTO available at
374 <http://www.tldp.org/docs.html#howto>.
376 Even if you don't know what to do here, say Y.
379 int "Maximum number of CPUs (2-512)"
382 default "32" if !64BIT
383 default "64" if 64BIT
385 This allows you to specify the maximum number of CPUs which this
386 kernel will support. The maximum supported value is 512 and the
387 minimum value which makes sense is 2.
389 This is purely to save memory - each supported CPU adds
390 approximately sixteen kilobytes to the kernel image.
394 prompt "Support for hot-pluggable CPUs"
397 Say Y here to be able to turn CPUs off and on. CPUs
398 can be controlled through /sys/devices/system/cpu/cpu#.
399 Say N if you want to disable CPU hotplug.
410 config SCHED_TOPOLOGY
412 prompt "Topology scheduler support"
418 Topology scheduler support improves the CPU scheduler's decision
419 making when dealing with machines that have multi-threading,
420 multiple cores or multiple books.
422 source kernel/Kconfig.preempt
426 prompt "IEEE FPU emulation"
429 This option is required for IEEE compliant floating point arithmetic
430 on older ESA/390 machines. Say Y unless you know your machine doesn't
433 source kernel/Kconfig.hz
439 config ARCH_SPARSEMEM_ENABLE
441 select SPARSEMEM_VMEMMAP_ENABLE
442 select SPARSEMEM_VMEMMAP
443 select SPARSEMEM_STATIC if !64BIT
445 config ARCH_SPARSEMEM_DEFAULT
448 config ARCH_SELECT_MEMORY_MODEL
451 config ARCH_ENABLE_MEMORY_HOTPLUG
452 def_bool y if SPARSEMEM
454 config ARCH_ENABLE_MEMORY_HOTREMOVE
457 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
461 config FORCE_MAX_ZONEORDER
469 prompt "Pack kernel stack"
471 This option enables the compiler option -mkernel-backchain if it
472 is available. If the option is available the compiler supports
473 the new stack layout which dramatically reduces the minimum stack
474 frame size. With an old compiler a non-leaf function needs a
475 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
476 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
477 and 24 byte on 64 bit.
479 Say Y if you are unsure.
483 prompt "Detect kernel stack overflow"
485 This option enables the compiler option -mstack-guard and
486 -mstack-size if they are available. If the compiler supports them
487 it will emit additional code to each function prolog to trigger
488 an illegal operation if the kernel stack is about to overflow.
490 Say N if you are unsure.
493 int "Size of the guard area (128-1024)"
495 depends on CHECK_STACK
498 This allows you to specify the size of the guard area at the lower
499 end of the kernel stack. If the kernel stack points into the guard
500 area on function entry an illegal operation is triggered. The size
501 needs to be a power of 2. Please keep in mind that the size of an
502 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
503 The minimum size for the stack guard should be 256 for 31 bit and
506 config WARN_DYNAMIC_STACK
508 prompt "Emit compiler warnings for function with dynamic stack usage"
510 This option enables the compiler option -mwarn-dynamicstack. If the
511 compiler supports this options generates warnings for functions
512 that dynamically allocate stack space using alloca.
514 Say N if you are unsure.
522 prompt "QDIO support"
524 This driver provides the Queued Direct I/O base support for
527 To compile this driver as a module, choose M here: the
528 module will be called qdio.
535 select HAVE_DMA_ATTRS
542 config PCI_NR_FUNCTIONS
543 int "Maximum number of PCI functions (1-4096)"
547 This allows you to specify the maximum number of PCI functions which
548 this kernel will support.
551 int "Maximum number of MSI interrupts (64-32768)"
555 This defines the number of virtual interrupts the kernel will
556 provide for MSI interrupts. If you configure your system to have
557 too few drivers will fail to allocate MSI interrupts for all
560 source "drivers/pci/Kconfig"
561 source "drivers/pci/pcie/Kconfig"
562 source "drivers/pci/hotplug/Kconfig"
577 select HAVE_DMA_API_DEBUG
579 config NEED_SG_DMA_LENGTH
582 config NEED_DMA_MAP_STATE
587 prompt "Support for CHSC subchannels"
589 This driver allows usage of CHSC subchannels. A CHSC subchannel
590 is usually present on LPAR only.
591 The driver creates a device /dev/chsc, which may be used to
592 obtain I/O configuration information about the machine and
593 to issue asynchronous chsc commands (DANGEROUS).
594 You will usually only want to use this interface on a special
595 LPAR designated for system management.
597 To compile this driver as a module, choose M here: the
598 module will be called chsc_sch.
605 prompt "SCM bus driver"
607 Bus driver for Storage Class Memory.
611 prompt "Support for EADM subchannels"
614 This driver allows usage of EADM subchannels. EADM subchannels act
615 as a communication vehicle for SCM increments.
617 To compile this driver as a module, choose M here: the
618 module will be called eadm_sch.
625 bool "kernel crash dumps"
626 depends on 64BIT && SMP
629 Generate crash dump after being started by kexec.
630 Crash dump kernels are loaded in the main kernel with kexec-tools
631 into a specially reserved region and then later executed after
632 a crash by kdump/kexec.
633 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
634 This option also enables s390 zfcpdump.
635 See also <file:Documentation/s390/zfcpdump.txt>
639 menu "Executable file formats / Emulations"
641 source "fs/Kconfig.binfmt"
645 prompt "Enable seccomp to safely compute untrusted bytecode"
648 This kernel feature is useful for number crunching applications
649 that may need to compute untrusted bytecode during their
650 execution. By using pipes or other transports made available to
651 the process as file descriptors supporting the read/write
652 syscalls, it's possible to isolate those applications in
653 their own address space using seccomp. Once seccomp is
654 enabled via /proc/<pid>/seccomp, it cannot be disabled
655 and the task is only allowed to execute a few safe syscalls
656 defined by each seccomp mode.
662 menu "Power Management"
664 config ARCH_HIBERNATION_POSSIBLE
667 source "kernel/power/Kconfig"
679 source "drivers/Kconfig"
683 source "arch/s390/Kconfig.debug"
685 source "security/Kconfig"
687 source "crypto/Kconfig"
691 menu "Virtualization"
695 prompt "Pseudo page fault support"
697 Select this option, if you want to use PFAULT pseudo page fault
698 handling under VM. If running native or in LPAR, this option
699 has no effect. If your VM does not support PFAULT, PAGEEX
700 pseudo page fault handling will be used.
701 Note that VM 4.2 supports PFAULT but has a bug in its
702 implementation that causes some problems.
703 Everybody who wants to run Linux under VM != VM4.2 should select
707 bool "VM shared kernel support"
708 depends on !JUMP_LABEL
710 Select this option, if you want to share the text segment of the
711 Linux kernel between different VM guests. This reduces memory
712 usage with lots of guests but greatly increases kernel size.
713 Also if a kernel was IPL'ed from a shared segment the kexec system
715 You should only select this option if you know what you are
716 doing and want to exploit this feature.
720 prompt "Cooperative memory management"
722 Select this option, if you want to enable the kernel interface
723 to reduce the memory size of the system. This is accomplished
724 by allocating pages of memory and put them "on hold". This only
725 makes sense for a system running under VM where the unused pages
726 will be reused by VM for other guest systems. The interface
727 allows an external monitor to balance memory of many systems.
728 Everybody who wants to run Linux under VM should select this
733 prompt "IUCV special message interface to cooperative memory management"
734 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
736 Select this option to enable the special message interface to
737 the cooperative memory management.
741 prompt "Linux - VM Monitor Stream, base infrastructure"
744 This provides a kernel interface for creating and updating z/VM APPLDATA
745 monitor records. The monitor records are updated at certain time
746 intervals, once the timer is started.
747 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
748 i.e. enables or disables monitoring on the Linux side.
749 A custom interval value (in seconds) can be written to
750 /proc/appldata/interval.
752 Defaults are 60 seconds interval and timer off.
753 The /proc entries can also be read from, showing the current settings.
757 prompt "Monitor memory management statistics"
758 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
760 This provides memory management related data to the Linux - VM Monitor
761 Stream, like paging/swapping rate, memory utilisation, etc.
762 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
763 APPLDATA monitor record, i.e. enables or disables monitoring this record
767 The /proc entry can also be read from, showing the current settings.
769 This can also be compiled as a module, which will be called
774 prompt "Monitor OS statistics"
775 depends on APPLDATA_BASE
777 This provides OS related data to the Linux - VM Monitor Stream, like
778 CPU utilisation, etc.
779 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
780 APPLDATA monitor record, i.e. enables or disables monitoring this record
784 This can also be compiled as a module, which will be called
787 config APPLDATA_NET_SUM
789 prompt "Monitor overall network statistics"
790 depends on APPLDATA_BASE && NET
792 This provides network related data to the Linux - VM Monitor Stream,
793 currently there is only a total sum of network I/O statistics, no
795 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
796 APPLDATA monitor record, i.e. enables or disables monitoring this record
800 This can also be compiled as a module, which will be called
805 prompt "s390 hypervisor file system support"
806 select SYS_HYPERVISOR
808 This is a virtual file system intended to provide accounting
809 information in an s390 hypervisor environment.
811 source "arch/s390/kvm/Kconfig"
815 prompt "s390 support for virtio devices"
818 select VIRTUALIZATION
820 select VIRTIO_CONSOLE
822 Enabling this option adds support for virtio based paravirtual device
825 Select this option if you want to run the kernel as a guest under