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
137 select HAVE_LIVEPATCH
139 select HAVE_MEMBLOCK_NODE_MAP
140 select HAVE_MEMBLOCK_PHYS_MAP
141 select HAVE_MOD_ARCH_SPECIFIC
143 select HAVE_PERF_EVENTS
144 select HAVE_REGS_AND_STACK_ACCESS_API
145 select HAVE_SYSCALL_TRACEPOINTS
146 select HAVE_UID16 if 32BIT
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
157 config SCHED_OMIT_FRAME_POINTER
160 config PGTABLE_LEVELS
165 source "init/Kconfig"
167 source "kernel/Kconfig.freezer"
169 source "kernel/livepatch/Kconfig"
171 menu "Processor type and features"
173 config HAVE_MARCH_Z900_FEATURES
176 config HAVE_MARCH_Z990_FEATURES
178 select HAVE_MARCH_Z900_FEATURES
180 config HAVE_MARCH_Z9_109_FEATURES
182 select HAVE_MARCH_Z990_FEATURES
184 config HAVE_MARCH_Z10_FEATURES
186 select HAVE_MARCH_Z9_109_FEATURES
188 config HAVE_MARCH_Z196_FEATURES
190 select HAVE_MARCH_Z10_FEATURES
192 config HAVE_MARCH_ZEC12_FEATURES
194 select HAVE_MARCH_Z196_FEATURES
196 config HAVE_MARCH_Z13_FEATURES
198 select HAVE_MARCH_ZEC12_FEATURES
201 prompt "Processor type"
205 bool "System/390 model G5 and G6"
208 Select this to build a 31 bit kernel that works
209 on all ESA/390 and z/Architecture machines.
212 bool "IBM zSeries model z800 and z900"
213 select HAVE_MARCH_Z900_FEATURES if 64BIT
215 Select this to enable optimizations for model z800/z900 (2064 and
216 2066 series). This will enable some optimizations that are not
217 available on older ESA/390 (31 Bit) only CPUs.
220 bool "IBM zSeries model z890 and z990"
221 select HAVE_MARCH_Z990_FEATURES if 64BIT
223 Select this to enable optimizations for model z890/z990 (2084 and
224 2086 series). The kernel will be slightly faster but will not work
229 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
231 Select this to enable optimizations for IBM System z9 (2094 and
232 2096 series). The kernel will be slightly faster but will not work
236 bool "IBM System z10"
237 select HAVE_MARCH_Z10_FEATURES if 64BIT
239 Select this to enable optimizations for IBM System z10 (2097 and
240 2098 series). The kernel will be slightly faster but will not work
244 bool "IBM zEnterprise 114 and 196"
245 select HAVE_MARCH_Z196_FEATURES if 64BIT
247 Select this to enable optimizations for IBM zEnterprise 114 and 196
248 (2818 and 2817 series). The kernel will be slightly faster but will
249 not work on older machines.
252 bool "IBM zBC12 and zEC12"
253 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
255 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
256 2827 series). The kernel will be slightly faster but will not work on
261 select HAVE_MARCH_Z13_FEATURES if 64BIT
263 Select this to enable optimizations for IBM z13 (2964 series).
264 The kernel will be slightly faster but will not work on older
270 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
272 config MARCH_Z900_TUNE
273 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
275 config MARCH_Z990_TUNE
276 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
278 config MARCH_Z9_109_TUNE
279 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
281 config MARCH_Z10_TUNE
282 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
284 config MARCH_Z196_TUNE
285 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
287 config MARCH_ZEC12_TUNE
288 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
290 config MARCH_Z13_TUNE
291 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
294 prompt "Tune code generation"
297 Cause the compiler to tune (-mtune) the generated code for a machine.
298 This will make the code run faster on the selected machine but
299 somewhat slower on other machines.
300 This option only changes how the compiler emits instructions, not the
301 selection of instructions itself, so the resulting kernel will run on
307 Tune the generated code for the target processor for which the kernel
311 bool "System/390 model G5 and G6"
314 bool "IBM zSeries model z800 and z900"
317 bool "IBM zSeries model z890 and z990"
323 bool "IBM System z10"
326 bool "IBM zEnterprise 114 and 196"
329 bool "IBM zBC12 and zEC12"
338 prompt "64 bit kernel"
340 Select this option if you have an IBM z/Architecture machine
341 and want to use the 64 bit addressing mode.
348 prompt "Kernel support for 31 bit emulation"
350 select COMPAT_BINFMT_ELF if BINFMT_ELF
351 select ARCH_WANT_OLD_COMPAT_IPC
352 select COMPAT_OLD_SIGACTION
354 Select this option if you want to enable your system kernel to
355 handle system-calls from ELF binaries for 31 bit ESA. This option
356 (and some other stuff like libraries and such) is needed for
357 executing 31 bit applications. It is safe to say "Y".
359 config SYSVIPC_COMPAT
360 def_bool y if COMPAT && SYSVIPC
363 def_bool y if COMPAT && KEYS
367 prompt "Symmetric multi-processing support"
369 This enables support for systems with more than one CPU. If you have
370 a system with only one CPU, like most personal computers, say N. If
371 you have a system with more than one CPU, say Y.
373 If you say N here, the kernel will run on uni- and multiprocessor
374 machines, but will use only one CPU of a multiprocessor machine. If
375 you say Y here, the kernel will run on many, but not all,
376 uniprocessor machines. On a uniprocessor machine, the kernel
377 will run faster if you say N here.
379 See also the SMP-HOWTO available at
380 <http://www.tldp.org/docs.html#howto>.
382 Even if you don't know what to do here, say Y.
385 int "Maximum number of CPUs (2-512)"
388 default "32" if !64BIT
389 default "64" if 64BIT
391 This allows you to specify the maximum number of CPUs which this
392 kernel will support. The maximum supported value is 512 and the
393 minimum value which makes sense is 2.
395 This is purely to save memory - each supported CPU adds
396 approximately sixteen kilobytes to the kernel image.
400 prompt "Support for hot-pluggable CPUs"
403 Say Y here to be able to turn CPUs off and on. CPUs
404 can be controlled through /sys/devices/system/cpu/cpu#.
405 Say N if you want to disable CPU hotplug.
416 config SCHED_TOPOLOGY
418 prompt "Topology scheduler support"
424 Topology scheduler support improves the CPU scheduler's decision
425 making when dealing with machines that have multi-threading,
426 multiple cores or multiple books.
428 source kernel/Kconfig.preempt
432 prompt "IEEE FPU emulation"
435 This option is required for IEEE compliant floating point arithmetic
436 on older ESA/390 machines. Say Y unless you know your machine doesn't
439 source kernel/Kconfig.hz
445 config ARCH_SPARSEMEM_ENABLE
447 select SPARSEMEM_VMEMMAP_ENABLE
448 select SPARSEMEM_VMEMMAP
449 select SPARSEMEM_STATIC if !64BIT
451 config ARCH_SPARSEMEM_DEFAULT
454 config ARCH_SELECT_MEMORY_MODEL
457 config ARCH_ENABLE_MEMORY_HOTPLUG
458 def_bool y if SPARSEMEM
460 config ARCH_ENABLE_MEMORY_HOTREMOVE
463 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
467 config FORCE_MAX_ZONEORDER
475 prompt "Pack kernel stack"
477 This option enables the compiler option -mkernel-backchain if it
478 is available. If the option is available the compiler supports
479 the new stack layout which dramatically reduces the minimum stack
480 frame size. With an old compiler a non-leaf function needs a
481 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
482 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
483 and 24 byte on 64 bit.
485 Say Y if you are unsure.
489 prompt "Detect kernel stack overflow"
491 This option enables the compiler option -mstack-guard and
492 -mstack-size if they are available. If the compiler supports them
493 it will emit additional code to each function prolog to trigger
494 an illegal operation if the kernel stack is about to overflow.
496 Say N if you are unsure.
499 int "Size of the guard area (128-1024)"
501 depends on CHECK_STACK
504 This allows you to specify the size of the guard area at the lower
505 end of the kernel stack. If the kernel stack points into the guard
506 area on function entry an illegal operation is triggered. The size
507 needs to be a power of 2. Please keep in mind that the size of an
508 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
509 The minimum size for the stack guard should be 256 for 31 bit and
512 config WARN_DYNAMIC_STACK
514 prompt "Emit compiler warnings for function with dynamic stack usage"
516 This option enables the compiler option -mwarn-dynamicstack. If the
517 compiler supports this options generates warnings for functions
518 that dynamically allocate stack space using alloca.
520 Say N if you are unsure.
528 prompt "QDIO support"
530 This driver provides the Queued Direct I/O base support for
533 To compile this driver as a module, choose M here: the
534 module will be called qdio.
541 select HAVE_DMA_ATTRS
548 config PCI_NR_FUNCTIONS
549 int "Maximum number of PCI functions (1-4096)"
553 This allows you to specify the maximum number of PCI functions which
554 this kernel will support.
557 int "Maximum number of MSI interrupts (64-32768)"
561 This defines the number of virtual interrupts the kernel will
562 provide for MSI interrupts. If you configure your system to have
563 too few drivers will fail to allocate MSI interrupts for all
566 source "drivers/pci/Kconfig"
567 source "drivers/pci/pcie/Kconfig"
568 source "drivers/pci/hotplug/Kconfig"
583 select HAVE_DMA_API_DEBUG
585 config NEED_SG_DMA_LENGTH
588 config NEED_DMA_MAP_STATE
593 prompt "Support for CHSC subchannels"
595 This driver allows usage of CHSC subchannels. A CHSC subchannel
596 is usually present on LPAR only.
597 The driver creates a device /dev/chsc, which may be used to
598 obtain I/O configuration information about the machine and
599 to issue asynchronous chsc commands (DANGEROUS).
600 You will usually only want to use this interface on a special
601 LPAR designated for system management.
603 To compile this driver as a module, choose M here: the
604 module will be called chsc_sch.
611 prompt "SCM bus driver"
613 Bus driver for Storage Class Memory.
617 prompt "Support for EADM subchannels"
620 This driver allows usage of EADM subchannels. EADM subchannels act
621 as a communication vehicle for SCM increments.
623 To compile this driver as a module, choose M here: the
624 module will be called eadm_sch.
631 bool "kernel crash dumps"
632 depends on 64BIT && SMP
635 Generate crash dump after being started by kexec.
636 Crash dump kernels are loaded in the main kernel with kexec-tools
637 into a specially reserved region and then later executed after
638 a crash by kdump/kexec.
639 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
640 This option also enables s390 zfcpdump.
641 See also <file:Documentation/s390/zfcpdump.txt>
645 menu "Executable file formats / Emulations"
647 source "fs/Kconfig.binfmt"
651 prompt "Enable seccomp to safely compute untrusted bytecode"
654 This kernel feature is useful for number crunching applications
655 that may need to compute untrusted bytecode during their
656 execution. By using pipes or other transports made available to
657 the process as file descriptors supporting the read/write
658 syscalls, it's possible to isolate those applications in
659 their own address space using seccomp. Once seccomp is
660 enabled via /proc/<pid>/seccomp, it cannot be disabled
661 and the task is only allowed to execute a few safe syscalls
662 defined by each seccomp mode.
668 menu "Power Management"
670 config ARCH_HIBERNATION_POSSIBLE
673 source "kernel/power/Kconfig"
685 source "drivers/Kconfig"
689 source "arch/s390/Kconfig.debug"
691 source "security/Kconfig"
693 source "crypto/Kconfig"
697 menu "Virtualization"
701 prompt "Pseudo page fault support"
703 Select this option, if you want to use PFAULT pseudo page fault
704 handling under VM. If running native or in LPAR, this option
705 has no effect. If your VM does not support PFAULT, PAGEEX
706 pseudo page fault handling will be used.
707 Note that VM 4.2 supports PFAULT but has a bug in its
708 implementation that causes some problems.
709 Everybody who wants to run Linux under VM != VM4.2 should select
713 bool "VM shared kernel support"
714 depends on !JUMP_LABEL
716 Select this option, if you want to share the text segment of the
717 Linux kernel between different VM guests. This reduces memory
718 usage with lots of guests but greatly increases kernel size.
719 Also if a kernel was IPL'ed from a shared segment the kexec system
721 You should only select this option if you know what you are
722 doing and want to exploit this feature.
726 prompt "Cooperative memory management"
728 Select this option, if you want to enable the kernel interface
729 to reduce the memory size of the system. This is accomplished
730 by allocating pages of memory and put them "on hold". This only
731 makes sense for a system running under VM where the unused pages
732 will be reused by VM for other guest systems. The interface
733 allows an external monitor to balance memory of many systems.
734 Everybody who wants to run Linux under VM should select this
739 prompt "IUCV special message interface to cooperative memory management"
740 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
742 Select this option to enable the special message interface to
743 the cooperative memory management.
747 prompt "Linux - VM Monitor Stream, base infrastructure"
750 This provides a kernel interface for creating and updating z/VM APPLDATA
751 monitor records. The monitor records are updated at certain time
752 intervals, once the timer is started.
753 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
754 i.e. enables or disables monitoring on the Linux side.
755 A custom interval value (in seconds) can be written to
756 /proc/appldata/interval.
758 Defaults are 60 seconds interval and timer off.
759 The /proc entries can also be read from, showing the current settings.
763 prompt "Monitor memory management statistics"
764 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
766 This provides memory management related data to the Linux - VM Monitor
767 Stream, like paging/swapping rate, memory utilisation, etc.
768 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
769 APPLDATA monitor record, i.e. enables or disables monitoring this record
773 The /proc entry can also be read from, showing the current settings.
775 This can also be compiled as a module, which will be called
780 prompt "Monitor OS statistics"
781 depends on APPLDATA_BASE
783 This provides OS related data to the Linux - VM Monitor Stream, like
784 CPU utilisation, etc.
785 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
786 APPLDATA monitor record, i.e. enables or disables monitoring this record
790 This can also be compiled as a module, which will be called
793 config APPLDATA_NET_SUM
795 prompt "Monitor overall network statistics"
796 depends on APPLDATA_BASE && NET
798 This provides network related data to the Linux - VM Monitor Stream,
799 currently there is only a total sum of network I/O statistics, no
801 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
802 APPLDATA monitor record, i.e. enables or disables monitoring this record
806 This can also be compiled as a module, which will be called
811 prompt "s390 hypervisor file system support"
812 select SYS_HYPERVISOR
814 This is a virtual file system intended to provide accounting
815 information in an s390 hypervisor environment.
817 source "arch/s390/kvm/Kconfig"
821 prompt "s390 support for virtio devices"
824 select VIRTUALIZATION
826 select VIRTIO_CONSOLE
828 Enabling this option adds support for virtio based paravirtual device
831 Select this option if you want to run the kernel as a guest under