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
63 select USE_GENERIC_SMP_HELPERS if SMP
64 select GENERIC_CPU_DEVICES if !SMP
65 select HAVE_SYSCALL_WRAPPERS
66 select HAVE_FUNCTION_TRACER
67 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
68 select HAVE_FTRACE_MCOUNT_RECORD
69 select HAVE_C_RECORDMCOUNT
70 select HAVE_SYSCALL_TRACEPOINTS
71 select SYSCTL_EXCEPTION_TRACE
72 select HAVE_DYNAMIC_FTRACE
73 select HAVE_FUNCTION_GRAPH_TRACER
74 select HAVE_REGS_AND_STACK_ACCESS_API
77 select HAVE_KRETPROBES
78 select HAVE_KVM if 64BIT
79 select HAVE_ARCH_TRACEHOOK
80 select INIT_ALL_POSSIBLE
82 select HAVE_PERF_EVENTS
83 select ARCH_HAVE_NMI_SAFE_CMPXCHG
84 select HAVE_DEBUG_KMEMLEAK
85 select HAVE_KERNEL_GZIP
86 select HAVE_KERNEL_BZIP2
87 select HAVE_KERNEL_LZMA
88 select HAVE_KERNEL_LZO
90 select HAVE_ARCH_MUTEX_CPU_RELAX
91 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
92 select HAVE_BPF_JIT if 64BIT && PACK_STACK
93 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
94 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
96 select HAVE_MEMBLOCK_NODE_MAP
97 select HAVE_CMPXCHG_LOCAL
98 select HAVE_CMPXCHG_DOUBLE
99 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
100 select HAVE_VIRT_CPU_ACCOUNTING
101 select VIRT_CPU_ACCOUNTING
102 select ARCH_DISCARD_MEMBLOCK
103 select BUILDTIME_EXTABLE_SORT
104 select ARCH_INLINE_SPIN_TRYLOCK
105 select ARCH_INLINE_SPIN_TRYLOCK_BH
106 select ARCH_INLINE_SPIN_LOCK
107 select ARCH_INLINE_SPIN_LOCK_BH
108 select ARCH_INLINE_SPIN_LOCK_IRQ
109 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
110 select ARCH_INLINE_SPIN_UNLOCK
111 select ARCH_INLINE_SPIN_UNLOCK_BH
112 select ARCH_INLINE_SPIN_UNLOCK_IRQ
113 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
114 select ARCH_INLINE_READ_TRYLOCK
115 select ARCH_INLINE_READ_LOCK
116 select ARCH_INLINE_READ_LOCK_BH
117 select ARCH_INLINE_READ_LOCK_IRQ
118 select ARCH_INLINE_READ_LOCK_IRQSAVE
119 select ARCH_INLINE_READ_UNLOCK
120 select ARCH_INLINE_READ_UNLOCK_BH
121 select ARCH_INLINE_READ_UNLOCK_IRQ
122 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
123 select ARCH_INLINE_WRITE_TRYLOCK
124 select ARCH_INLINE_WRITE_LOCK
125 select ARCH_INLINE_WRITE_LOCK_BH
126 select ARCH_INLINE_WRITE_LOCK_IRQ
127 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
128 select ARCH_INLINE_WRITE_UNLOCK
129 select ARCH_INLINE_WRITE_UNLOCK_BH
130 select ARCH_INLINE_WRITE_UNLOCK_IRQ
131 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
132 select HAVE_UID16 if 32BIT
133 select ARCH_WANT_IPC_PARSE_VERSION
134 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
135 select GENERIC_SMP_IDLE_THREAD
136 select GENERIC_TIME_VSYSCALL_OLD
137 select GENERIC_CLOCKEVENTS
138 select KTIME_SCALAR if 32BIT
139 select HAVE_ARCH_SECCOMP_FILTER
140 select HAVE_MOD_ARCH_SPECIFIC
141 select MODULES_USE_ELF_RELA
142 select CLONE_BACKWARDS2
143 select GENERIC_SIGALTSTACK
144 select GENERIC_COMPAT_RT_SIGACTION
145 select GENERIC_COMPAT_RT_SIGQUEUEINFO
146 select GENERIC_COMPAT_RT_SIGPROCMASK
147 select GENERIC_COMPAT_RT_SIGPENDING
148 select OLD_SIGSUSPEND3
151 config SCHED_OMIT_FRAME_POINTER
154 source "init/Kconfig"
156 source "kernel/Kconfig.freezer"
158 menu "Processor type and features"
160 config HAVE_MARCH_Z900_FEATURES
163 config HAVE_MARCH_Z990_FEATURES
165 select HAVE_MARCH_Z900_FEATURES
167 config HAVE_MARCH_Z9_109_FEATURES
169 select HAVE_MARCH_Z990_FEATURES
171 config HAVE_MARCH_Z10_FEATURES
173 select HAVE_MARCH_Z9_109_FEATURES
175 config HAVE_MARCH_Z196_FEATURES
177 select HAVE_MARCH_Z10_FEATURES
179 config HAVE_MARCH_ZEC12_FEATURES
181 select HAVE_MARCH_Z196_FEATURES
184 prompt "Processor type"
188 bool "System/390 model G5 and G6"
191 Select this to build a 31 bit kernel that works
192 on all ESA/390 and z/Architecture machines.
195 bool "IBM zSeries model z800 and z900"
196 select HAVE_MARCH_Z900_FEATURES if 64BIT
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 if 64BIT
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 if 64BIT
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 if 64BIT
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 if 64BIT
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.
236 select HAVE_MARCH_ZEC12_FEATURES if 64BIT
238 Select this to enable optimizations for IBM zEC12 (2827 series). The
239 kernel will be slightly faster but will not work on older machines.
245 prompt "64 bit kernel"
247 Select this option if you have an IBM z/Architecture machine
248 and want to use the 64 bit addressing mode.
255 prompt "Kernel support for 31 bit emulation"
257 select COMPAT_BINFMT_ELF if BINFMT_ELF
258 select ARCH_WANT_OLD_COMPAT_IPC
259 select COMPAT_OLD_SIGACTION
261 Select this option if you want to enable your system kernel to
262 handle system-calls from ELF binaries for 31 bit ESA. This option
263 (and some other stuff like libraries and such) is needed for
264 executing 31 bit applications. It is safe to say "Y".
266 config SYSVIPC_COMPAT
267 def_bool y if COMPAT && SYSVIPC
270 def_bool y if COMPAT && KEYS
274 prompt "Symmetric multi-processing support"
276 This enables support for systems with more than one CPU. If you have
277 a system with only one CPU, like most personal computers, say N. If
278 you have a system with more than one CPU, say Y.
280 If you say N here, the kernel will run on single and multiprocessor
281 machines, but will use only one CPU of a multiprocessor machine. If
282 you say Y here, the kernel will run on many, but not all,
283 singleprocessor machines. On a singleprocessor machine, the kernel
284 will run faster if you say N here.
286 See also the SMP-HOWTO available at
287 <http://www.tldp.org/docs.html#howto>.
289 Even if you don't know what to do here, say Y.
292 int "Maximum number of CPUs (2-64)"
295 default "32" if !64BIT
296 default "64" if 64BIT
298 This allows you to specify the maximum number of CPUs which this
299 kernel will support. The maximum supported value is 64 and the
300 minimum value which makes sense is 2.
302 This is purely to save memory - each supported CPU adds
303 approximately sixteen kilobytes to the kernel image.
307 prompt "Support for hot-pluggable CPUs"
311 Say Y here to be able to turn CPUs off and on. CPUs
312 can be controlled through /sys/devices/system/cpu/cpu#.
313 Say N if you want to disable CPU hotplug.
320 prompt "Book scheduler support"
324 Book scheduler support improves the CPU scheduler's decision making
325 when dealing with machines that have several books.
327 source kernel/Kconfig.preempt
331 prompt "IEEE FPU emulation"
334 This option is required for IEEE compliant floating point arithmetic
335 on older ESA/390 machines. Say Y unless you know your machine doesn't
338 source kernel/Kconfig.hz
344 config ARCH_SPARSEMEM_ENABLE
346 select SPARSEMEM_VMEMMAP_ENABLE
347 select SPARSEMEM_VMEMMAP
348 select SPARSEMEM_STATIC if !64BIT
350 config ARCH_SPARSEMEM_DEFAULT
353 config ARCH_SELECT_MEMORY_MODEL
356 config ARCH_ENABLE_MEMORY_HOTPLUG
357 def_bool y if SPARSEMEM
359 config ARCH_ENABLE_MEMORY_HOTREMOVE
362 config FORCE_MAX_ZONEORDER
370 prompt "Pack kernel stack"
372 This option enables the compiler option -mkernel-backchain if it
373 is available. If the option is available the compiler supports
374 the new stack layout which dramatically reduces the minimum stack
375 frame size. With an old compiler a non-leaf function needs a
376 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
377 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
378 and 24 byte on 64 bit.
380 Say Y if you are unsure.
384 prompt "Use 8kb for kernel stack instead of 16kb"
385 depends on PACK_STACK && 64BIT && !LOCKDEP
387 If you say Y here and the compiler supports the -mkernel-backchain
388 option the kernel will use a smaller kernel stack size. The reduced
389 size is 8kb instead of 16kb. This allows to run more threads on a
390 system and reduces the pressure on the memory management for higher
391 order page allocations.
393 Say N if you are unsure.
397 prompt "Detect kernel stack overflow"
399 This option enables the compiler option -mstack-guard and
400 -mstack-size if they are available. If the compiler supports them
401 it will emit additional code to each function prolog to trigger
402 an illegal operation if the kernel stack is about to overflow.
404 Say N if you are unsure.
407 int "Size of the guard area (128-1024)"
409 depends on CHECK_STACK
412 This allows you to specify the size of the guard area at the lower
413 end of the kernel stack. If the kernel stack points into the guard
414 area on function entry an illegal operation is triggered. The size
415 needs to be a power of 2. Please keep in mind that the size of an
416 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
417 The minimum size for the stack guard should be 256 for 31 bit and
420 config WARN_DYNAMIC_STACK
422 prompt "Emit compiler warnings for function with dynamic stack usage"
424 This option enables the compiler option -mwarn-dynamicstack. If the
425 compiler supports this options generates warnings for functions
426 that dynamically allocate stack space using alloca.
428 Say N if you are unsure.
436 prompt "QDIO support"
438 This driver provides the Queued Direct I/O base support for
441 To compile this driver as a module, choose M here: the
442 module will be called qdio.
450 select ARCH_SUPPORTS_MSI
457 config PCI_NR_FUNCTIONS
458 int "Maximum number of PCI functions (1-4096)"
462 This allows you to specify the maximum number of PCI functions which
463 this kernel will support.
465 source "drivers/pci/Kconfig"
466 source "drivers/pci/pcie/Kconfig"
467 source "drivers/pci/hotplug/Kconfig"
482 select HAVE_DMA_API_DEBUG
484 config NEED_SG_DMA_LENGTH
487 config HAVE_DMA_ATTRS
490 config NEED_DMA_MAP_STATE
495 prompt "Support for CHSC subchannels"
497 This driver allows usage of CHSC subchannels. A CHSC subchannel
498 is usually present on LPAR only.
499 The driver creates a device /dev/chsc, which may be used to
500 obtain I/O configuration information about the machine and
501 to issue asynchronous chsc commands (DANGEROUS).
502 You will usually only want to use this interface on a special
503 LPAR designated for system management.
505 To compile this driver as a module, choose M here: the
506 module will be called chsc_sch.
513 prompt "SCM bus driver"
515 Bus driver for Storage Class Memory.
519 prompt "Support for EADM subchannels"
522 This driver allows usage of EADM subchannels. EADM subchannels act
523 as a communication vehicle for SCM increments.
525 To compile this driver as a module, choose M here: the
526 module will be called eadm_sch.
533 bool "kernel crash dumps"
534 depends on 64BIT && SMP
537 Generate crash dump after being started by kexec.
538 Crash dump kernels are loaded in the main kernel with kexec-tools
539 into a specially reserved region and then later executed after
540 a crash by kdump/kexec.
541 For more details see Documentation/kdump/kdump.txt
545 prompt "zfcpdump support"
548 Select this option if you want to build an zfcpdump enabled kernel.
549 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
553 menu "Executable file formats / Emulations"
555 source "fs/Kconfig.binfmt"
559 prompt "Enable seccomp to safely compute untrusted bytecode"
562 This kernel feature is useful for number crunching applications
563 that may need to compute untrusted bytecode during their
564 execution. By using pipes or other transports made available to
565 the process as file descriptors supporting the read/write
566 syscalls, it's possible to isolate those applications in
567 their own address space using seccomp. Once seccomp is
568 enabled via /proc/<pid>/seccomp, it cannot be disabled
569 and the task is only allowed to execute a few safe syscalls
570 defined by each seccomp mode.
576 menu "Power Management"
578 config ARCH_HIBERNATION_POSSIBLE
581 source "kernel/power/Kconfig"
593 source "drivers/Kconfig"
597 source "arch/s390/Kconfig.debug"
599 source "security/Kconfig"
601 source "crypto/Kconfig"
605 menu "Virtualization"
609 prompt "Pseudo page fault support"
611 Select this option, if you want to use PFAULT pseudo page fault
612 handling under VM. If running native or in LPAR, this option
613 has no effect. If your VM does not support PFAULT, PAGEEX
614 pseudo page fault handling will be used.
615 Note that VM 4.2 supports PFAULT but has a bug in its
616 implementation that causes some problems.
617 Everybody who wants to run Linux under VM != VM4.2 should select
621 bool "VM shared kernel support"
622 depends on !JUMP_LABEL
624 Select this option, if you want to share the text segment of the
625 Linux kernel between different VM guests. This reduces memory
626 usage with lots of guests but greatly increases kernel size.
627 Also if a kernel was IPL'ed from a shared segment the kexec system
629 You should only select this option if you know what you are
630 doing and want to exploit this feature.
634 prompt "Cooperative memory management"
636 Select this option, if you want to enable the kernel interface
637 to reduce the memory size of the system. This is accomplished
638 by allocating pages of memory and put them "on hold". This only
639 makes sense for a system running under VM where the unused pages
640 will be reused by VM for other guest systems. The interface
641 allows an external monitor to balance memory of many systems.
642 Everybody who wants to run Linux under VM should select this
647 prompt "IUCV special message interface to cooperative memory management"
648 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
650 Select this option to enable the special message interface to
651 the cooperative memory management.
655 prompt "Linux - VM Monitor Stream, base infrastructure"
658 This provides a kernel interface for creating and updating z/VM APPLDATA
659 monitor records. The monitor records are updated at certain time
660 intervals, once the timer is started.
661 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
662 i.e. enables or disables monitoring on the Linux side.
663 A custom interval value (in seconds) can be written to
664 /proc/appldata/interval.
666 Defaults are 60 seconds interval and timer off.
667 The /proc entries can also be read from, showing the current settings.
671 prompt "Monitor memory management statistics"
672 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
674 This provides memory management related data to the Linux - VM Monitor
675 Stream, like paging/swapping rate, memory utilisation, etc.
676 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
677 APPLDATA monitor record, i.e. enables or disables monitoring this record
681 The /proc entry can also be read from, showing the current settings.
683 This can also be compiled as a module, which will be called
688 prompt "Monitor OS statistics"
689 depends on APPLDATA_BASE
691 This provides OS related data to the Linux - VM Monitor Stream, like
692 CPU utilisation, etc.
693 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
694 APPLDATA monitor record, i.e. enables or disables monitoring this record
698 This can also be compiled as a module, which will be called
701 config APPLDATA_NET_SUM
703 prompt "Monitor overall network statistics"
704 depends on APPLDATA_BASE && NET
706 This provides network related data to the Linux - VM Monitor Stream,
707 currently there is only a total sum of network I/O statistics, no
709 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
710 APPLDATA monitor record, i.e. enables or disables monitoring this record
714 This can also be compiled as a module, which will be called
719 prompt "s390 hypervisor file system support"
720 select SYS_HYPERVISOR
722 This is a virtual file system intended to provide accounting
723 information in an s390 hypervisor environment.
725 source "arch/s390/kvm/Kconfig"
729 prompt "s390 support for virtio devices (EXPERIMENTAL)"
730 depends on 64BIT && EXPERIMENTAL
731 select VIRTUALIZATION
733 select VIRTIO_CONSOLE
735 Enabling this option adds support for virtio based paravirtual device
738 Select this option if you want to run the kernel as a guest under