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
43 config ARCH_DMA_ADDR_T_64BIT
46 config GENERIC_LOCKBREAK
47 def_bool y if SMP && PREEMPT
52 config VIRT_CPU_ACCOUNTING
55 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
60 select USE_GENERIC_SMP_HELPERS if SMP
61 select GENERIC_CPU_DEVICES if !SMP
62 select HAVE_SYSCALL_WRAPPERS
63 select HAVE_FUNCTION_TRACER
64 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
65 select HAVE_FTRACE_MCOUNT_RECORD
66 select HAVE_C_RECORDMCOUNT
67 select HAVE_SYSCALL_TRACEPOINTS
68 select HAVE_DYNAMIC_FTRACE
69 select HAVE_FUNCTION_GRAPH_TRACER
70 select HAVE_REGS_AND_STACK_ACCESS_API
73 select HAVE_KRETPROBES
74 select HAVE_KVM if 64BIT
75 select HAVE_ARCH_TRACEHOOK
76 select INIT_ALL_POSSIBLE
78 select HAVE_PERF_EVENTS
79 select ARCH_HAVE_NMI_SAFE_CMPXCHG
80 select HAVE_KERNEL_GZIP
81 select HAVE_KERNEL_BZIP2
82 select HAVE_KERNEL_LZMA
83 select HAVE_KERNEL_LZO
85 select HAVE_ARCH_MUTEX_CPU_RELAX
86 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
87 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
88 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
90 select HAVE_MEMBLOCK_NODE_MAP
91 select HAVE_CMPXCHG_LOCAL
92 select ARCH_DISCARD_MEMBLOCK
93 select BUILDTIME_EXTABLE_SORT
94 select ARCH_INLINE_SPIN_TRYLOCK
95 select ARCH_INLINE_SPIN_TRYLOCK_BH
96 select ARCH_INLINE_SPIN_LOCK
97 select ARCH_INLINE_SPIN_LOCK_BH
98 select ARCH_INLINE_SPIN_LOCK_IRQ
99 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
100 select ARCH_INLINE_SPIN_UNLOCK
101 select ARCH_INLINE_SPIN_UNLOCK_BH
102 select ARCH_INLINE_SPIN_UNLOCK_IRQ
103 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
104 select ARCH_INLINE_READ_TRYLOCK
105 select ARCH_INLINE_READ_LOCK
106 select ARCH_INLINE_READ_LOCK_BH
107 select ARCH_INLINE_READ_LOCK_IRQ
108 select ARCH_INLINE_READ_LOCK_IRQSAVE
109 select ARCH_INLINE_READ_UNLOCK
110 select ARCH_INLINE_READ_UNLOCK_BH
111 select ARCH_INLINE_READ_UNLOCK_IRQ
112 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
113 select ARCH_INLINE_WRITE_TRYLOCK
114 select ARCH_INLINE_WRITE_LOCK
115 select ARCH_INLINE_WRITE_LOCK_BH
116 select ARCH_INLINE_WRITE_LOCK_IRQ
117 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
118 select ARCH_INLINE_WRITE_UNLOCK
119 select ARCH_INLINE_WRITE_UNLOCK_BH
120 select ARCH_INLINE_WRITE_UNLOCK_IRQ
121 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
122 select ARCH_WANT_IPC_PARSE_VERSION
123 select GENERIC_SMP_IDLE_THREAD
124 select GENERIC_TIME_VSYSCALL
125 select GENERIC_CLOCKEVENTS
126 select KTIME_SCALAR if 32BIT
127 select HAVE_ARCH_SECCOMP_FILTER
128 select GENERIC_KERNEL_THREAD
130 config SCHED_OMIT_FRAME_POINTER
133 source "init/Kconfig"
135 source "kernel/Kconfig.freezer"
139 comment "Processor type and features"
143 prompt "64 bit kernel"
145 Select this option if you have an IBM z/Architecture machine
146 and want to use the 64 bit addressing mode.
153 prompt "Symmetric multi-processing support"
155 This enables support for systems with more than one CPU. If you have
156 a system with only one CPU, like most personal computers, say N. If
157 you have a system with more than one CPU, say Y.
159 If you say N here, the kernel will run on single and multiprocessor
160 machines, but will use only one CPU of a multiprocessor machine. If
161 you say Y here, the kernel will run on many, but not all,
162 singleprocessor machines. On a singleprocessor machine, the kernel
163 will run faster if you say N here.
165 See also the SMP-HOWTO available at
166 <http://www.tldp.org/docs.html#howto>.
168 Even if you don't know what to do here, say Y.
171 int "Maximum number of CPUs (2-64)"
174 default "32" if !64BIT
175 default "64" if 64BIT
177 This allows you to specify the maximum number of CPUs which this
178 kernel will support. The maximum supported value is 64 and the
179 minimum value which makes sense is 2.
181 This is purely to save memory - each supported CPU adds
182 approximately sixteen kilobytes to the kernel image.
186 prompt "Support for hot-pluggable CPUs"
190 Say Y here to be able to turn CPUs off and on. CPUs
191 can be controlled through /sys/devices/system/cpu/cpu#.
192 Say N if you want to disable CPU hotplug.
199 prompt "Book scheduler support"
203 Book scheduler support improves the CPU scheduler's decision making
204 when dealing with machines that have several books.
208 prompt "IEEE FPU emulation"
211 This option is required for IEEE compliant floating point arithmetic
212 on older ESA/390 machines. Say Y unless you know your machine doesn't
217 prompt "Kernel support for 31 bit emulation"
219 select COMPAT_BINFMT_ELF if BINFMT_ELF
220 select ARCH_WANT_OLD_COMPAT_IPC
222 Select this option if you want to enable your system kernel to
223 handle system-calls from ELF binaries for 31 bit ESA. This option
224 (and some other stuff like libraries and such) is needed for
225 executing 31 bit applications. It is safe to say "Y".
227 config SYSVIPC_COMPAT
228 def_bool y if COMPAT && SYSVIPC
231 def_bool y if COMPAT && KEYS
236 config HAVE_MARCH_Z900_FEATURES
239 config HAVE_MARCH_Z990_FEATURES
241 select HAVE_MARCH_Z900_FEATURES
243 config HAVE_MARCH_Z9_109_FEATURES
245 select HAVE_MARCH_Z990_FEATURES
247 config HAVE_MARCH_Z10_FEATURES
249 select HAVE_MARCH_Z9_109_FEATURES
251 config HAVE_MARCH_Z196_FEATURES
253 select HAVE_MARCH_Z10_FEATURES
255 comment "Code generation options"
258 prompt "Processor type"
262 bool "System/390 model G5 and G6"
265 Select this to build a 31 bit kernel that works
266 on all ESA/390 and z/Architecture machines.
269 bool "IBM zSeries model z800 and z900"
270 select HAVE_MARCH_Z900_FEATURES if 64BIT
272 Select this to enable optimizations for model z800/z900 (2064 and
273 2066 series). This will enable some optimizations that are not
274 available on older ESA/390 (31 Bit) only CPUs.
277 bool "IBM zSeries model z890 and z990"
278 select HAVE_MARCH_Z990_FEATURES if 64BIT
280 Select this to enable optimizations for model z890/z990 (2084 and
281 2086 series). The kernel will be slightly faster but will not work
286 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
288 Select this to enable optimizations for IBM System z9 (2094 and
289 2096 series). The kernel will be slightly faster but will not work
293 bool "IBM System z10"
294 select HAVE_MARCH_Z10_FEATURES if 64BIT
296 Select this to enable optimizations for IBM System z10 (2097 and
297 2098 series). The kernel will be slightly faster but will not work
301 bool "IBM zEnterprise 114 and 196"
302 select HAVE_MARCH_Z196_FEATURES if 64BIT
304 Select this to enable optimizations for IBM zEnterprise 114 and 196
305 (2818 and 2817 series). The kernel will be slightly faster but will
306 not work on older machines.
312 prompt "Pack kernel stack"
314 This option enables the compiler option -mkernel-backchain if it
315 is available. If the option is available the compiler supports
316 the new stack layout which dramatically reduces the minimum stack
317 frame size. With an old compiler a non-leaf function needs a
318 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
319 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
320 and 24 byte on 64 bit.
322 Say Y if you are unsure.
326 prompt "Use 8kb for kernel stack instead of 16kb"
327 depends on PACK_STACK && 64BIT && !LOCKDEP
329 If you say Y here and the compiler supports the -mkernel-backchain
330 option the kernel will use a smaller kernel stack size. The reduced
331 size is 8kb instead of 16kb. This allows to run more threads on a
332 system and reduces the pressure on the memory management for higher
333 order page allocations.
335 Say N if you are unsure.
339 prompt "Detect kernel stack overflow"
341 This option enables the compiler option -mstack-guard and
342 -mstack-size if they are available. If the compiler supports them
343 it will emit additional code to each function prolog to trigger
344 an illegal operation if the kernel stack is about to overflow.
346 Say N if you are unsure.
349 int "Size of the guard area (128-1024)"
351 depends on CHECK_STACK
354 This allows you to specify the size of the guard area at the lower
355 end of the kernel stack. If the kernel stack points into the guard
356 area on function entry an illegal operation is triggered. The size
357 needs to be a power of 2. Please keep in mind that the size of an
358 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
359 The minimum size for the stack guard should be 256 for 31 bit and
362 config WARN_DYNAMIC_STACK
364 prompt "Emit compiler warnings for function with dynamic stack usage"
366 This option enables the compiler option -mwarn-dynamicstack. If the
367 compiler supports this options generates warnings for functions
368 that dynamically allocate stack space using alloca.
370 Say N if you are unsure.
372 comment "Kernel preemption"
374 source "kernel/Kconfig.preempt"
376 config ARCH_SPARSEMEM_ENABLE
378 select SPARSEMEM_VMEMMAP_ENABLE
379 select SPARSEMEM_VMEMMAP
380 select SPARSEMEM_STATIC if !64BIT
382 config ARCH_SPARSEMEM_DEFAULT
385 config ARCH_SELECT_MEMORY_MODEL
388 config ARCH_ENABLE_MEMORY_HOTPLUG
389 def_bool y if SPARSEMEM
391 config ARCH_ENABLE_MEMORY_HOTREMOVE
394 config ARCH_HIBERNATION_POSSIBLE
399 comment "I/O subsystem configuration"
403 prompt "QDIO support"
405 This driver provides the Queued Direct I/O base support for
408 To compile this driver as a module, choose M here: the
409 module will be called qdio.
415 prompt "Support for CHSC subchannels"
417 This driver allows usage of CHSC subchannels. A CHSC subchannel
418 is usually present on LPAR only.
419 The driver creates a device /dev/chsc, which may be used to
420 obtain I/O configuration information about the machine and
421 to issue asynchronous chsc commands (DANGEROUS).
422 You will usually only want to use this interface on a special
423 LPAR designated for system management.
425 To compile this driver as a module, choose M here: the
426 module will be called chsc_sch.
432 source "fs/Kconfig.binfmt"
434 config FORCE_MAX_ZONEORDER
440 prompt "Pseudo page fault support"
442 Select this option, if you want to use PFAULT pseudo page fault
443 handling under VM. If running native or in LPAR, this option
444 has no effect. If your VM does not support PFAULT, PAGEEX
445 pseudo page fault handling will be used.
446 Note that VM 4.2 supports PFAULT but has a bug in its
447 implementation that causes some problems.
448 Everybody who wants to run Linux under VM != VM4.2 should select
453 prompt "VM shared kernel support"
455 Select this option, if you want to share the text segment of the
456 Linux kernel between different VM guests. This reduces memory
457 usage with lots of guests but greatly increases kernel size.
458 Also if a kernel was IPL'ed from a shared segment the kexec system
460 You should only select this option if you know what you are
461 doing and want to exploit this feature.
465 prompt "Cooperative memory management"
467 Select this option, if you want to enable the kernel interface
468 to reduce the memory size of the system. This is accomplished
469 by allocating pages of memory and put them "on hold". This only
470 makes sense for a system running under VM where the unused pages
471 will be reused by VM for other guest systems. The interface
472 allows an external monitor to balance memory of many systems.
473 Everybody who wants to run Linux under VM should select this
478 prompt "IUCV special message interface to cooperative memory management"
479 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
481 Select this option to enable the special message interface to
482 the cooperative memory management.
486 prompt "Linux - VM Monitor Stream, base infrastructure"
489 This provides a kernel interface for creating and updating z/VM APPLDATA
490 monitor records. The monitor records are updated at certain time
491 intervals, once the timer is started.
492 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
493 i.e. enables or disables monitoring on the Linux side.
494 A custom interval value (in seconds) can be written to
495 /proc/appldata/interval.
497 Defaults are 60 seconds interval and timer off.
498 The /proc entries can also be read from, showing the current settings.
502 prompt "Monitor memory management statistics"
503 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
505 This provides memory management related data to the Linux - VM Monitor
506 Stream, like paging/swapping rate, memory utilisation, etc.
507 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
508 APPLDATA monitor record, i.e. enables or disables monitoring this record
512 The /proc entry can also be read from, showing the current settings.
514 This can also be compiled as a module, which will be called
519 prompt "Monitor OS statistics"
520 depends on APPLDATA_BASE
522 This provides OS related data to the Linux - VM Monitor Stream, like
523 CPU utilisation, etc.
524 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
525 APPLDATA monitor record, i.e. enables or disables monitoring this record
529 This can also be compiled as a module, which will be called
532 config APPLDATA_NET_SUM
534 prompt "Monitor overall network statistics"
535 depends on APPLDATA_BASE && NET
537 This provides network related data to the Linux - VM Monitor Stream,
538 currently there is only a total sum of network I/O statistics, no
540 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
541 APPLDATA monitor record, i.e. enables or disables monitoring this record
545 This can also be compiled as a module, which will be called
548 source kernel/Kconfig.hz
552 prompt "s390 hypervisor file system support"
553 select SYS_HYPERVISOR
555 This is a virtual file system intended to provide accounting
556 information in an s390 hypervisor environment.
560 prompt "kexec system call"
562 kexec is a system call that implements the ability to shutdown your
563 current kernel, and to start another kernel. It is like a reboot
564 but is independent of hardware/microcode support.
567 bool "kernel crash dumps"
568 depends on 64BIT && SMP
571 Generate crash dump after being started by kexec.
572 Crash dump kernels are loaded in the main kernel with kexec-tools
573 into a specially reserved region and then later executed after
574 a crash by kdump/kexec.
575 For more details see Documentation/kdump/kdump.txt
579 prompt "zfcpdump support"
582 Select this option if you want to build an zfcpdump enabled kernel.
583 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
587 prompt "s390 guest support for KVM (EXPERIMENTAL)"
588 depends on 64BIT && EXPERIMENTAL
589 select VIRTUALIZATION
592 select VIRTIO_CONSOLE
594 Select this option if you want to run the kernel as a guest under
595 the KVM hypervisor. This will add detection for KVM as well as a
596 virtio transport. If KVM is detected, the virtio console will be
601 prompt "Enable seccomp to safely compute untrusted bytecode"
604 This kernel feature is useful for number crunching applications
605 that may need to compute untrusted bytecode during their
606 execution. By using pipes or other transports made available to
607 the process as file descriptors supporting the read/write
608 syscalls, it's possible to isolate those applications in
609 their own address space using seccomp. Once seccomp is
610 enabled via /proc/<pid>/seccomp, it cannot be disabled
611 and the task is only allowed to execute a few safe syscalls
612 defined by each seccomp mode.
618 menu "Power Management"
620 source "kernel/power/Kconfig"
632 source "drivers/Kconfig"
636 source "arch/s390/Kconfig.debug"
638 source "security/Kconfig"
640 source "crypto/Kconfig"
644 source "arch/s390/kvm/Kconfig"