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_HAVE_NMI_SAFE_CMPXCHG
70 select ARCH_INLINE_READ_LOCK
71 select ARCH_INLINE_READ_LOCK_BH
72 select ARCH_INLINE_READ_LOCK_IRQ
73 select ARCH_INLINE_READ_LOCK_IRQSAVE
74 select ARCH_INLINE_READ_TRYLOCK
75 select ARCH_INLINE_READ_UNLOCK
76 select ARCH_INLINE_READ_UNLOCK_BH
77 select ARCH_INLINE_READ_UNLOCK_IRQ
78 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
79 select ARCH_INLINE_SPIN_LOCK
80 select ARCH_INLINE_SPIN_LOCK_BH
81 select ARCH_INLINE_SPIN_LOCK_IRQ
82 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
83 select ARCH_INLINE_SPIN_TRYLOCK
84 select ARCH_INLINE_SPIN_TRYLOCK_BH
85 select ARCH_INLINE_SPIN_UNLOCK
86 select ARCH_INLINE_SPIN_UNLOCK_BH
87 select ARCH_INLINE_SPIN_UNLOCK_IRQ
88 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
89 select ARCH_INLINE_WRITE_LOCK
90 select ARCH_INLINE_WRITE_LOCK_BH
91 select ARCH_INLINE_WRITE_LOCK_IRQ
92 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
93 select ARCH_INLINE_WRITE_TRYLOCK
94 select ARCH_INLINE_WRITE_UNLOCK
95 select ARCH_INLINE_WRITE_UNLOCK_BH
96 select ARCH_INLINE_WRITE_UNLOCK_IRQ
97 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
98 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
99 select ARCH_SUPPORTS_ATOMIC_RMW
100 select ARCH_USE_CMPXCHG_LOCKREF
101 select ARCH_WANT_IPC_PARSE_VERSION
102 select BUILDTIME_EXTABLE_SORT
103 select CLONE_BACKWARDS2
104 select DYNAMIC_FTRACE if FUNCTION_TRACER
105 select GENERIC_CLOCKEVENTS
106 select GENERIC_CPU_DEVICES if !SMP
107 select GENERIC_FIND_FIRST_BIT
108 select GENERIC_SMP_IDLE_THREAD
109 select GENERIC_TIME_VSYSCALL
110 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
111 select HAVE_ARCH_AUDITSYSCALL
112 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
113 select HAVE_ARCH_SECCOMP_FILTER
114 select HAVE_ARCH_TRACEHOOK
115 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
116 select HAVE_BPF_JIT if 64BIT && PACK_STACK
117 select HAVE_CMPXCHG_DOUBLE
118 select HAVE_CMPXCHG_LOCAL
119 select HAVE_C_RECORDMCOUNT
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
155 select ARCH_HAS_SG_CHAIN
157 config SCHED_OMIT_FRAME_POINTER
160 source "init/Kconfig"
162 source "kernel/Kconfig.freezer"
164 source "kernel/livepatch/Kconfig"
166 menu "Processor type and features"
168 config HAVE_MARCH_Z900_FEATURES
171 config HAVE_MARCH_Z990_FEATURES
173 select HAVE_MARCH_Z900_FEATURES
175 config HAVE_MARCH_Z9_109_FEATURES
177 select HAVE_MARCH_Z990_FEATURES
179 config HAVE_MARCH_Z10_FEATURES
181 select HAVE_MARCH_Z9_109_FEATURES
183 config HAVE_MARCH_Z196_FEATURES
185 select HAVE_MARCH_Z10_FEATURES
187 config HAVE_MARCH_ZEC12_FEATURES
189 select HAVE_MARCH_Z196_FEATURES
192 prompt "Processor type"
196 bool "System/390 model G5 and G6"
199 Select this to build a 31 bit kernel that works
200 on all ESA/390 and z/Architecture machines.
203 bool "IBM zSeries model z800 and z900"
204 select HAVE_MARCH_Z900_FEATURES if 64BIT
206 Select this to enable optimizations for model z800/z900 (2064 and
207 2066 series). This will enable some optimizations that are not
208 available on older ESA/390 (31 Bit) only CPUs.
211 bool "IBM zSeries model z890 and z990"
212 select HAVE_MARCH_Z990_FEATURES if 64BIT
214 Select this to enable optimizations for model z890/z990 (2084 and
215 2086 series). The kernel will be slightly faster but will not work
220 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
222 Select this to enable optimizations for IBM System z9 (2094 and
223 2096 series). The kernel will be slightly faster but will not work
227 bool "IBM System z10"
228 select HAVE_MARCH_Z10_FEATURES if 64BIT
230 Select this to enable optimizations for IBM System z10 (2097 and
231 2098 series). The kernel will be slightly faster but will not work
235 bool "IBM zEnterprise 114 and 196"
236 select HAVE_MARCH_Z196_FEATURES if 64BIT
238 Select this to enable optimizations for IBM zEnterprise 114 and 196
239 (2818 and 2817 series). The kernel will be slightly faster but will
240 not work on older machines.
243 bool "IBM zBC12 and zEC12"
244 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
246 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
247 2827 series). The kernel will be slightly faster but will not work on
253 def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
255 config MARCH_Z900_TUNE
256 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
258 config MARCH_Z990_TUNE
259 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
261 config MARCH_Z9_109_TUNE
262 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
264 config MARCH_Z10_TUNE
265 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
267 config MARCH_Z196_TUNE
268 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
270 config MARCH_ZEC12_TUNE
271 def_bool TUNE_ZEC12 || MARCH_ZEC12 && 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 "System/390 model G5 and G6"
294 bool "IBM zSeries model z800 and z900"
297 bool "IBM zSeries model z890 and z990"
303 bool "IBM System z10"
306 bool "IBM zEnterprise 114 and 196"
309 bool "IBM zBC12 and zEC12"
315 prompt "64 bit kernel"
317 Select this option if you have an IBM z/Architecture machine
318 and want to use the 64 bit addressing mode.
325 prompt "Kernel support for 31 bit emulation"
327 select COMPAT_BINFMT_ELF if BINFMT_ELF
328 select ARCH_WANT_OLD_COMPAT_IPC
329 select COMPAT_OLD_SIGACTION
331 Select this option if you want to enable your system kernel to
332 handle system-calls from ELF binaries for 31 bit ESA. This option
333 (and some other stuff like libraries and such) is needed for
334 executing 31 bit applications. It is safe to say "Y".
336 config SYSVIPC_COMPAT
337 def_bool y if COMPAT && SYSVIPC
340 def_bool y if COMPAT && KEYS
344 prompt "Symmetric multi-processing support"
346 This enables support for systems with more than one CPU. If you have
347 a system with only one CPU, like most personal computers, say N. If
348 you have a system with more than one CPU, say Y.
350 If you say N here, the kernel will run on uni- and multiprocessor
351 machines, but will use only one CPU of a multiprocessor machine. If
352 you say Y here, the kernel will run on many, but not all,
353 uniprocessor machines. On a uniprocessor machine, the kernel
354 will run faster if you say N here.
356 See also the SMP-HOWTO available at
357 <http://www.tldp.org/docs.html#howto>.
359 Even if you don't know what to do here, say Y.
362 int "Maximum number of CPUs (2-256)"
365 default "32" if !64BIT
366 default "64" if 64BIT
368 This allows you to specify the maximum number of CPUs which this
369 kernel will support. The maximum supported value is 256 and the
370 minimum value which makes sense is 2.
372 This is purely to save memory - each supported CPU adds
373 approximately sixteen kilobytes to the kernel image.
377 prompt "Support for hot-pluggable CPUs"
380 Say Y here to be able to turn CPUs off and on. CPUs
381 can be controlled through /sys/devices/system/cpu/cpu#.
382 Say N if you want to disable CPU hotplug.
389 prompt "Book scheduler support"
393 Book scheduler support improves the CPU scheduler's decision making
394 when dealing with machines that have several books.
396 source kernel/Kconfig.preempt
400 prompt "IEEE FPU emulation"
403 This option is required for IEEE compliant floating point arithmetic
404 on older ESA/390 machines. Say Y unless you know your machine doesn't
407 source kernel/Kconfig.hz
413 config ARCH_SPARSEMEM_ENABLE
415 select SPARSEMEM_VMEMMAP_ENABLE
416 select SPARSEMEM_VMEMMAP
417 select SPARSEMEM_STATIC if !64BIT
419 config ARCH_SPARSEMEM_DEFAULT
422 config ARCH_SELECT_MEMORY_MODEL
425 config ARCH_ENABLE_MEMORY_HOTPLUG
426 def_bool y if SPARSEMEM
428 config ARCH_ENABLE_MEMORY_HOTREMOVE
431 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
435 config FORCE_MAX_ZONEORDER
443 prompt "Pack kernel stack"
445 This option enables the compiler option -mkernel-backchain if it
446 is available. If the option is available the compiler supports
447 the new stack layout which dramatically reduces the minimum stack
448 frame size. With an old compiler a non-leaf function needs a
449 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
450 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
451 and 24 byte on 64 bit.
453 Say Y if you are unsure.
457 prompt "Detect kernel stack overflow"
459 This option enables the compiler option -mstack-guard and
460 -mstack-size if they are available. If the compiler supports them
461 it will emit additional code to each function prolog to trigger
462 an illegal operation if the kernel stack is about to overflow.
464 Say N if you are unsure.
467 int "Size of the guard area (128-1024)"
469 depends on CHECK_STACK
472 This allows you to specify the size of the guard area at the lower
473 end of the kernel stack. If the kernel stack points into the guard
474 area on function entry an illegal operation is triggered. The size
475 needs to be a power of 2. Please keep in mind that the size of an
476 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
477 The minimum size for the stack guard should be 256 for 31 bit and
480 config WARN_DYNAMIC_STACK
482 prompt "Emit compiler warnings for function with dynamic stack usage"
484 This option enables the compiler option -mwarn-dynamicstack. If the
485 compiler supports this options generates warnings for functions
486 that dynamically allocate stack space using alloca.
488 Say N if you are unsure.
496 prompt "QDIO support"
498 This driver provides the Queued Direct I/O base support for
501 To compile this driver as a module, choose M here: the
502 module will be called qdio.
509 select HAVE_DMA_ATTRS
516 config PCI_NR_FUNCTIONS
517 int "Maximum number of PCI functions (1-4096)"
521 This allows you to specify the maximum number of PCI functions which
522 this kernel will support.
525 int "Maximum number of MSI interrupts (64-32768)"
529 This defines the number of virtual interrupts the kernel will
530 provide for MSI interrupts. If you configure your system to have
531 too few drivers will fail to allocate MSI interrupts for all
534 source "drivers/pci/Kconfig"
535 source "drivers/pci/pcie/Kconfig"
536 source "drivers/pci/hotplug/Kconfig"
551 select HAVE_DMA_API_DEBUG
553 config NEED_SG_DMA_LENGTH
556 config NEED_DMA_MAP_STATE
561 prompt "Support for CHSC subchannels"
563 This driver allows usage of CHSC subchannels. A CHSC subchannel
564 is usually present on LPAR only.
565 The driver creates a device /dev/chsc, which may be used to
566 obtain I/O configuration information about the machine and
567 to issue asynchronous chsc commands (DANGEROUS).
568 You will usually only want to use this interface on a special
569 LPAR designated for system management.
571 To compile this driver as a module, choose M here: the
572 module will be called chsc_sch.
579 prompt "SCM bus driver"
581 Bus driver for Storage Class Memory.
585 prompt "Support for EADM subchannels"
588 This driver allows usage of EADM subchannels. EADM subchannels act
589 as a communication vehicle for SCM increments.
591 To compile this driver as a module, choose M here: the
592 module will be called eadm_sch.
599 bool "kernel crash dumps"
600 depends on 64BIT && SMP
603 Generate crash dump after being started by kexec.
604 Crash dump kernels are loaded in the main kernel with kexec-tools
605 into a specially reserved region and then later executed after
606 a crash by kdump/kexec.
607 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
608 This option also enables s390 zfcpdump.
609 See also <file:Documentation/s390/zfcpdump.txt>
613 menu "Executable file formats / Emulations"
615 source "fs/Kconfig.binfmt"
619 prompt "Enable seccomp to safely compute untrusted bytecode"
622 This kernel feature is useful for number crunching applications
623 that may need to compute untrusted bytecode during their
624 execution. By using pipes or other transports made available to
625 the process as file descriptors supporting the read/write
626 syscalls, it's possible to isolate those applications in
627 their own address space using seccomp. Once seccomp is
628 enabled via /proc/<pid>/seccomp, it cannot be disabled
629 and the task is only allowed to execute a few safe syscalls
630 defined by each seccomp mode.
636 menu "Power Management"
638 config ARCH_HIBERNATION_POSSIBLE
641 source "kernel/power/Kconfig"
653 source "drivers/Kconfig"
657 source "arch/s390/Kconfig.debug"
659 source "security/Kconfig"
661 source "crypto/Kconfig"
665 menu "Virtualization"
669 prompt "Pseudo page fault support"
671 Select this option, if you want to use PFAULT pseudo page fault
672 handling under VM. If running native or in LPAR, this option
673 has no effect. If your VM does not support PFAULT, PAGEEX
674 pseudo page fault handling will be used.
675 Note that VM 4.2 supports PFAULT but has a bug in its
676 implementation that causes some problems.
677 Everybody who wants to run Linux under VM != VM4.2 should select
681 bool "VM shared kernel support"
682 depends on !JUMP_LABEL
684 Select this option, if you want to share the text segment of the
685 Linux kernel between different VM guests. This reduces memory
686 usage with lots of guests but greatly increases kernel size.
687 Also if a kernel was IPL'ed from a shared segment the kexec system
689 You should only select this option if you know what you are
690 doing and want to exploit this feature.
694 prompt "Cooperative memory management"
696 Select this option, if you want to enable the kernel interface
697 to reduce the memory size of the system. This is accomplished
698 by allocating pages of memory and put them "on hold". This only
699 makes sense for a system running under VM where the unused pages
700 will be reused by VM for other guest systems. The interface
701 allows an external monitor to balance memory of many systems.
702 Everybody who wants to run Linux under VM should select this
707 prompt "IUCV special message interface to cooperative memory management"
708 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
710 Select this option to enable the special message interface to
711 the cooperative memory management.
715 prompt "Linux - VM Monitor Stream, base infrastructure"
718 This provides a kernel interface for creating and updating z/VM APPLDATA
719 monitor records. The monitor records are updated at certain time
720 intervals, once the timer is started.
721 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
722 i.e. enables or disables monitoring on the Linux side.
723 A custom interval value (in seconds) can be written to
724 /proc/appldata/interval.
726 Defaults are 60 seconds interval and timer off.
727 The /proc entries can also be read from, showing the current settings.
731 prompt "Monitor memory management statistics"
732 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
734 This provides memory management related data to the Linux - VM Monitor
735 Stream, like paging/swapping rate, memory utilisation, etc.
736 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
737 APPLDATA monitor record, i.e. enables or disables monitoring this record
741 The /proc entry can also be read from, showing the current settings.
743 This can also be compiled as a module, which will be called
748 prompt "Monitor OS statistics"
749 depends on APPLDATA_BASE
751 This provides OS related data to the Linux - VM Monitor Stream, like
752 CPU utilisation, etc.
753 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
754 APPLDATA monitor record, i.e. enables or disables monitoring this record
758 This can also be compiled as a module, which will be called
761 config APPLDATA_NET_SUM
763 prompt "Monitor overall network statistics"
764 depends on APPLDATA_BASE && NET
766 This provides network related data to the Linux - VM Monitor Stream,
767 currently there is only a total sum of network I/O statistics, no
769 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
770 APPLDATA monitor record, i.e. enables or disables monitoring this record
774 This can also be compiled as a module, which will be called
779 prompt "s390 hypervisor file system support"
780 select SYS_HYPERVISOR
782 This is a virtual file system intended to provide accounting
783 information in an s390 hypervisor environment.
785 source "arch/s390/kvm/Kconfig"
789 prompt "s390 support for virtio devices"
792 select VIRTUALIZATION
794 select VIRTIO_CONSOLE
796 Enabling this option adds support for virtio based paravirtual device
799 Select this option if you want to run the kernel as a guest under