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_DEVICES if !SMP
109 select GENERIC_FIND_FIRST_BIT
110 select GENERIC_SMP_IDLE_THREAD
111 select GENERIC_TIME_VSYSCALL
112 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
113 select HAVE_ARCH_AUDITSYSCALL
114 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
115 select HAVE_ARCH_SECCOMP_FILTER
116 select HAVE_ARCH_TRACEHOOK
117 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
118 select HAVE_BPF_JIT if 64BIT && PACK_STACK
119 select HAVE_CMPXCHG_DOUBLE
120 select HAVE_CMPXCHG_LOCAL
121 select HAVE_DEBUG_KMEMLEAK
122 select HAVE_DYNAMIC_FTRACE if 64BIT
123 select HAVE_DYNAMIC_FTRACE_WITH_REGS if 64BIT
124 select HAVE_FTRACE_MCOUNT_RECORD
125 select HAVE_FUNCTION_GRAPH_TRACER if 64BIT
126 select HAVE_FUNCTION_TRACER if 64BIT
127 select HAVE_FUTEX_CMPXCHG if FUTEX
128 select HAVE_KERNEL_BZIP2
129 select HAVE_KERNEL_GZIP
130 select HAVE_KERNEL_LZ4
131 select HAVE_KERNEL_LZMA
132 select HAVE_KERNEL_LZO
133 select HAVE_KERNEL_XZ
135 select HAVE_KRETPROBES
136 select HAVE_KVM if 64BIT
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 config PGTABLE_LEVELS
164 source "init/Kconfig"
166 source "kernel/Kconfig.freezer"
168 menu "Processor type and features"
170 config HAVE_MARCH_Z900_FEATURES
173 config HAVE_MARCH_Z990_FEATURES
175 select HAVE_MARCH_Z900_FEATURES
177 config HAVE_MARCH_Z9_109_FEATURES
179 select HAVE_MARCH_Z990_FEATURES
181 config HAVE_MARCH_Z10_FEATURES
183 select HAVE_MARCH_Z9_109_FEATURES
185 config HAVE_MARCH_Z196_FEATURES
187 select HAVE_MARCH_Z10_FEATURES
189 config HAVE_MARCH_ZEC12_FEATURES
191 select HAVE_MARCH_Z196_FEATURES
193 config HAVE_MARCH_Z13_FEATURES
195 select HAVE_MARCH_ZEC12_FEATURES
198 prompt "Processor type"
202 bool "System/390 model G5 and G6"
205 Select this to build a 31 bit kernel that works
206 on all ESA/390 and z/Architecture machines.
209 bool "IBM zSeries model z800 and z900"
210 select HAVE_MARCH_Z900_FEATURES if 64BIT
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 if 64BIT
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 if 64BIT
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 if 64BIT
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 if 64BIT
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 if 64BIT
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 if 64BIT
260 Select this to enable optimizations for IBM z13 (2964 series).
261 The kernel will be slightly faster but will not work on older
267 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
269 config MARCH_Z900_TUNE
270 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
272 config MARCH_Z990_TUNE
273 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
275 config MARCH_Z9_109_TUNE
276 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
278 config MARCH_Z10_TUNE
279 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
281 config MARCH_Z196_TUNE
282 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
284 config MARCH_ZEC12_TUNE
285 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
287 config MARCH_Z13_TUNE
288 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
291 prompt "Tune code generation"
294 Cause the compiler to tune (-mtune) the generated code for a machine.
295 This will make the code run faster on the selected machine but
296 somewhat slower on other machines.
297 This option only changes how the compiler emits instructions, not the
298 selection of instructions itself, so the resulting kernel will run on
304 Tune the generated code for the target processor for which the kernel
308 bool "System/390 model G5 and G6"
311 bool "IBM zSeries model z800 and z900"
314 bool "IBM zSeries model z890 and z990"
320 bool "IBM System z10"
323 bool "IBM zEnterprise 114 and 196"
326 bool "IBM zBC12 and zEC12"
335 prompt "64 bit kernel"
337 Select this option if you have an IBM z/Architecture machine
338 and want to use the 64 bit addressing mode.
345 prompt "Kernel support for 31 bit emulation"
347 select COMPAT_BINFMT_ELF if BINFMT_ELF
348 select ARCH_WANT_OLD_COMPAT_IPC
349 select COMPAT_OLD_SIGACTION
351 Select this option if you want to enable your system kernel to
352 handle system-calls from ELF binaries for 31 bit ESA. This option
353 (and some other stuff like libraries and such) is needed for
354 executing 31 bit applications. It is safe to say "Y".
356 config SYSVIPC_COMPAT
357 def_bool y if COMPAT && SYSVIPC
360 def_bool y if COMPAT && KEYS
364 prompt "Symmetric multi-processing support"
366 This enables support for systems with more than one CPU. If you have
367 a system with only one CPU, like most personal computers, say N. If
368 you have a system with more than one CPU, say Y.
370 If you say N here, the kernel will run on uni- and multiprocessor
371 machines, but will use only one CPU of a multiprocessor machine. If
372 you say Y here, the kernel will run on many, but not all,
373 uniprocessor machines. On a uniprocessor machine, the kernel
374 will run faster if you say N here.
376 See also the SMP-HOWTO available at
377 <http://www.tldp.org/docs.html#howto>.
379 Even if you don't know what to do here, say Y.
382 int "Maximum number of CPUs (2-512)"
385 default "32" if !64BIT
386 default "64" if 64BIT
388 This allows you to specify the maximum number of CPUs which this
389 kernel will support. The maximum supported value is 512 and the
390 minimum value which makes sense is 2.
392 This is purely to save memory - each supported CPU adds
393 approximately sixteen kilobytes to the kernel image.
397 prompt "Support for hot-pluggable CPUs"
400 Say Y here to be able to turn CPUs off and on. CPUs
401 can be controlled through /sys/devices/system/cpu/cpu#.
402 Say N if you want to disable CPU hotplug.
413 config SCHED_TOPOLOGY
415 prompt "Topology scheduler support"
421 Topology scheduler support improves the CPU scheduler's decision
422 making when dealing with machines that have multi-threading,
423 multiple cores or multiple books.
425 source kernel/Kconfig.preempt
429 prompt "IEEE FPU emulation"
432 This option is required for IEEE compliant floating point arithmetic
433 on older ESA/390 machines. Say Y unless you know your machine doesn't
436 source kernel/Kconfig.hz
442 config ARCH_SPARSEMEM_ENABLE
444 select SPARSEMEM_VMEMMAP_ENABLE
445 select SPARSEMEM_VMEMMAP
446 select SPARSEMEM_STATIC if !64BIT
448 config ARCH_SPARSEMEM_DEFAULT
451 config ARCH_SELECT_MEMORY_MODEL
454 config ARCH_ENABLE_MEMORY_HOTPLUG
455 def_bool y if SPARSEMEM
457 config ARCH_ENABLE_MEMORY_HOTREMOVE
460 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
464 config FORCE_MAX_ZONEORDER
472 prompt "Pack kernel stack"
474 This option enables the compiler option -mkernel-backchain if it
475 is available. If the option is available the compiler supports
476 the new stack layout which dramatically reduces the minimum stack
477 frame size. With an old compiler a non-leaf function needs a
478 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
479 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
480 and 24 byte on 64 bit.
482 Say Y if you are unsure.
486 prompt "Detect kernel stack overflow"
488 This option enables the compiler option -mstack-guard and
489 -mstack-size if they are available. If the compiler supports them
490 it will emit additional code to each function prolog to trigger
491 an illegal operation if the kernel stack is about to overflow.
493 Say N if you are unsure.
496 int "Size of the guard area (128-1024)"
498 depends on CHECK_STACK
501 This allows you to specify the size of the guard area at the lower
502 end of the kernel stack. If the kernel stack points into the guard
503 area on function entry an illegal operation is triggered. The size
504 needs to be a power of 2. Please keep in mind that the size of an
505 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
506 The minimum size for the stack guard should be 256 for 31 bit and
509 config WARN_DYNAMIC_STACK
511 prompt "Emit compiler warnings for function with dynamic stack usage"
513 This option enables the compiler option -mwarn-dynamicstack. If the
514 compiler supports this options generates warnings for functions
515 that dynamically allocate stack space using alloca.
517 Say N if you are unsure.
525 prompt "QDIO support"
527 This driver provides the Queued Direct I/O base support for
530 To compile this driver as a module, choose M here: the
531 module will be called qdio.
538 select HAVE_DMA_ATTRS
545 config PCI_NR_FUNCTIONS
546 int "Maximum number of PCI functions (1-4096)"
550 This allows you to specify the maximum number of PCI functions which
551 this kernel will support.
554 int "Maximum number of MSI interrupts (64-32768)"
558 This defines the number of virtual interrupts the kernel will
559 provide for MSI interrupts. If you configure your system to have
560 too few drivers will fail to allocate MSI interrupts for all
563 source "drivers/pci/Kconfig"
564 source "drivers/pci/pcie/Kconfig"
565 source "drivers/pci/hotplug/Kconfig"
580 select HAVE_DMA_API_DEBUG
582 config NEED_SG_DMA_LENGTH
585 config NEED_DMA_MAP_STATE
590 prompt "Support for CHSC subchannels"
592 This driver allows usage of CHSC subchannels. A CHSC subchannel
593 is usually present on LPAR only.
594 The driver creates a device /dev/chsc, which may be used to
595 obtain I/O configuration information about the machine and
596 to issue asynchronous chsc commands (DANGEROUS).
597 You will usually only want to use this interface on a special
598 LPAR designated for system management.
600 To compile this driver as a module, choose M here: the
601 module will be called chsc_sch.
608 prompt "SCM bus driver"
610 Bus driver for Storage Class Memory.
614 prompt "Support for EADM subchannels"
617 This driver allows usage of EADM subchannels. EADM subchannels act
618 as a communication vehicle for SCM increments.
620 To compile this driver as a module, choose M here: the
621 module will be called eadm_sch.
628 bool "kernel crash dumps"
629 depends on 64BIT && SMP
632 Generate crash dump after being started by kexec.
633 Crash dump kernels are loaded in the main kernel with kexec-tools
634 into a specially reserved region and then later executed after
635 a crash by kdump/kexec.
636 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
637 This option also enables s390 zfcpdump.
638 See also <file:Documentation/s390/zfcpdump.txt>
642 menu "Executable file formats / Emulations"
644 source "fs/Kconfig.binfmt"
648 prompt "Enable seccomp to safely compute untrusted bytecode"
651 This kernel feature is useful for number crunching applications
652 that may need to compute untrusted bytecode during their
653 execution. By using pipes or other transports made available to
654 the process as file descriptors supporting the read/write
655 syscalls, it's possible to isolate those applications in
656 their own address space using seccomp. Once seccomp is
657 enabled via /proc/<pid>/seccomp, it cannot be disabled
658 and the task is only allowed to execute a few safe syscalls
659 defined by each seccomp mode.
665 menu "Power Management"
667 config ARCH_HIBERNATION_POSSIBLE
670 source "kernel/power/Kconfig"
682 source "drivers/Kconfig"
686 source "arch/s390/Kconfig.debug"
688 source "security/Kconfig"
690 source "crypto/Kconfig"
694 menu "Virtualization"
698 prompt "Pseudo page fault support"
700 Select this option, if you want to use PFAULT pseudo page fault
701 handling under VM. If running native or in LPAR, this option
702 has no effect. If your VM does not support PFAULT, PAGEEX
703 pseudo page fault handling will be used.
704 Note that VM 4.2 supports PFAULT but has a bug in its
705 implementation that causes some problems.
706 Everybody who wants to run Linux under VM != VM4.2 should select
710 bool "VM shared kernel support"
711 depends on !JUMP_LABEL
713 Select this option, if you want to share the text segment of the
714 Linux kernel between different VM guests. This reduces memory
715 usage with lots of guests but greatly increases kernel size.
716 Also if a kernel was IPL'ed from a shared segment the kexec system
718 You should only select this option if you know what you are
719 doing and want to exploit this feature.
723 prompt "Cooperative memory management"
725 Select this option, if you want to enable the kernel interface
726 to reduce the memory size of the system. This is accomplished
727 by allocating pages of memory and put them "on hold". This only
728 makes sense for a system running under VM where the unused pages
729 will be reused by VM for other guest systems. The interface
730 allows an external monitor to balance memory of many systems.
731 Everybody who wants to run Linux under VM should select this
736 prompt "IUCV special message interface to cooperative memory management"
737 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
739 Select this option to enable the special message interface to
740 the cooperative memory management.
744 prompt "Linux - VM Monitor Stream, base infrastructure"
747 This provides a kernel interface for creating and updating z/VM APPLDATA
748 monitor records. The monitor records are updated at certain time
749 intervals, once the timer is started.
750 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
751 i.e. enables or disables monitoring on the Linux side.
752 A custom interval value (in seconds) can be written to
753 /proc/appldata/interval.
755 Defaults are 60 seconds interval and timer off.
756 The /proc entries can also be read from, showing the current settings.
760 prompt "Monitor memory management statistics"
761 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
763 This provides memory management related data to the Linux - VM Monitor
764 Stream, like paging/swapping rate, memory utilisation, etc.
765 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
766 APPLDATA monitor record, i.e. enables or disables monitoring this record
770 The /proc entry can also be read from, showing the current settings.
772 This can also be compiled as a module, which will be called
777 prompt "Monitor OS statistics"
778 depends on APPLDATA_BASE
780 This provides OS related data to the Linux - VM Monitor Stream, like
781 CPU utilisation, etc.
782 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
783 APPLDATA monitor record, i.e. enables or disables monitoring this record
787 This can also be compiled as a module, which will be called
790 config APPLDATA_NET_SUM
792 prompt "Monitor overall network statistics"
793 depends on APPLDATA_BASE && NET
795 This provides network related data to the Linux - VM Monitor Stream,
796 currently there is only a total sum of network I/O statistics, no
798 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
799 APPLDATA monitor record, i.e. enables or disables monitoring this record
803 This can also be compiled as a module, which will be called
808 prompt "s390 hypervisor file system support"
809 select SYS_HYPERVISOR
811 This is a virtual file system intended to provide accounting
812 information in an s390 hypervisor environment.
814 source "arch/s390/kvm/Kconfig"
818 prompt "s390 support for virtio devices"
821 select VIRTUALIZATION
823 select VIRTIO_CONSOLE
825 Enabling this option adds support for virtio based paravirtual device
828 Select this option if you want to run the kernel as a guest under