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
128 config SCHED_OMIT_FRAME_POINTER
131 source "init/Kconfig"
133 source "kernel/Kconfig.freezer"
137 comment "Processor type and features"
141 prompt "64 bit kernel"
143 Select this option if you have an IBM z/Architecture machine
144 and want to use the 64 bit addressing mode.
151 prompt "Symmetric multi-processing support"
153 This enables support for systems with more than one CPU. If you have
154 a system with only one CPU, like most personal computers, say N. If
155 you have a system with more than one CPU, say Y.
157 If you say N here, the kernel will run on single and multiprocessor
158 machines, but will use only one CPU of a multiprocessor machine. If
159 you say Y here, the kernel will run on many, but not all,
160 singleprocessor machines. On a singleprocessor machine, the kernel
161 will run faster if you say N here.
163 See also the SMP-HOWTO available at
164 <http://www.tldp.org/docs.html#howto>.
166 Even if you don't know what to do here, say Y.
169 int "Maximum number of CPUs (2-64)"
172 default "32" if !64BIT
173 default "64" if 64BIT
175 This allows you to specify the maximum number of CPUs which this
176 kernel will support. The maximum supported value is 64 and the
177 minimum value which makes sense is 2.
179 This is purely to save memory - each supported CPU adds
180 approximately sixteen kilobytes to the kernel image.
184 prompt "Support for hot-pluggable CPUs"
188 Say Y here to be able to turn CPUs off and on. CPUs
189 can be controlled through /sys/devices/system/cpu/cpu#.
190 Say N if you want to disable CPU hotplug.
197 prompt "Book scheduler support"
201 Book scheduler support improves the CPU scheduler's decision making
202 when dealing with machines that have several books.
206 prompt "IEEE FPU emulation"
209 This option is required for IEEE compliant floating point arithmetic
210 on older ESA/390 machines. Say Y unless you know your machine doesn't
215 prompt "Kernel support for 31 bit emulation"
217 select COMPAT_BINFMT_ELF if BINFMT_ELF
218 select ARCH_WANT_OLD_COMPAT_IPC
220 Select this option if you want to enable your system kernel to
221 handle system-calls from ELF binaries for 31 bit ESA. This option
222 (and some other stuff like libraries and such) is needed for
223 executing 31 bit applications. It is safe to say "Y".
225 config SYSVIPC_COMPAT
226 def_bool y if COMPAT && SYSVIPC
229 def_bool y if COMPAT && KEYS
234 config HAVE_MARCH_Z900_FEATURES
237 config HAVE_MARCH_Z990_FEATURES
239 select HAVE_MARCH_Z900_FEATURES
241 config HAVE_MARCH_Z9_109_FEATURES
243 select HAVE_MARCH_Z990_FEATURES
245 config HAVE_MARCH_Z10_FEATURES
247 select HAVE_MARCH_Z9_109_FEATURES
249 config HAVE_MARCH_Z196_FEATURES
251 select HAVE_MARCH_Z10_FEATURES
253 comment "Code generation options"
256 prompt "Processor type"
260 bool "System/390 model G5 and G6"
263 Select this to build a 31 bit kernel that works
264 on all ESA/390 and z/Architecture machines.
267 bool "IBM zSeries model z800 and z900"
268 select HAVE_MARCH_Z900_FEATURES if 64BIT
270 Select this to enable optimizations for model z800/z900 (2064 and
271 2066 series). This will enable some optimizations that are not
272 available on older ESA/390 (31 Bit) only CPUs.
275 bool "IBM zSeries model z890 and z990"
276 select HAVE_MARCH_Z990_FEATURES if 64BIT
278 Select this to enable optimizations for model z890/z990 (2084 and
279 2086 series). The kernel will be slightly faster but will not work
284 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
286 Select this to enable optimizations for IBM System z9 (2094 and
287 2096 series). The kernel will be slightly faster but will not work
291 bool "IBM System z10"
292 select HAVE_MARCH_Z10_FEATURES if 64BIT
294 Select this to enable optimizations for IBM System z10 (2097 and
295 2098 series). The kernel will be slightly faster but will not work
299 bool "IBM zEnterprise 114 and 196"
300 select HAVE_MARCH_Z196_FEATURES if 64BIT
302 Select this to enable optimizations for IBM zEnterprise 114 and 196
303 (2818 and 2817 series). The kernel will be slightly faster but will
304 not work on older machines.
310 prompt "Pack kernel stack"
312 This option enables the compiler option -mkernel-backchain if it
313 is available. If the option is available the compiler supports
314 the new stack layout which dramatically reduces the minimum stack
315 frame size. With an old compiler a non-leaf function needs a
316 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
317 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
318 and 24 byte on 64 bit.
320 Say Y if you are unsure.
324 prompt "Use 8kb for kernel stack instead of 16kb"
325 depends on PACK_STACK && 64BIT && !LOCKDEP
327 If you say Y here and the compiler supports the -mkernel-backchain
328 option the kernel will use a smaller kernel stack size. The reduced
329 size is 8kb instead of 16kb. This allows to run more threads on a
330 system and reduces the pressure on the memory management for higher
331 order page allocations.
333 Say N if you are unsure.
337 prompt "Detect kernel stack overflow"
339 This option enables the compiler option -mstack-guard and
340 -mstack-size if they are available. If the compiler supports them
341 it will emit additional code to each function prolog to trigger
342 an illegal operation if the kernel stack is about to overflow.
344 Say N if you are unsure.
347 int "Size of the guard area (128-1024)"
349 depends on CHECK_STACK
352 This allows you to specify the size of the guard area at the lower
353 end of the kernel stack. If the kernel stack points into the guard
354 area on function entry an illegal operation is triggered. The size
355 needs to be a power of 2. Please keep in mind that the size of an
356 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
357 The minimum size for the stack guard should be 256 for 31 bit and
360 config WARN_DYNAMIC_STACK
362 prompt "Emit compiler warnings for function with dynamic stack usage"
364 This option enables the compiler option -mwarn-dynamicstack. If the
365 compiler supports this options generates warnings for functions
366 that dynamically allocate stack space using alloca.
368 Say N if you are unsure.
370 comment "Kernel preemption"
372 source "kernel/Kconfig.preempt"
374 config ARCH_SPARSEMEM_ENABLE
376 select SPARSEMEM_VMEMMAP_ENABLE
377 select SPARSEMEM_VMEMMAP
378 select SPARSEMEM_STATIC if !64BIT
380 config ARCH_SPARSEMEM_DEFAULT
383 config ARCH_SELECT_MEMORY_MODEL
386 config ARCH_ENABLE_MEMORY_HOTPLUG
387 def_bool y if SPARSEMEM
389 config ARCH_ENABLE_MEMORY_HOTREMOVE
392 config ARCH_HIBERNATION_POSSIBLE
397 comment "I/O subsystem configuration"
401 prompt "QDIO support"
403 This driver provides the Queued Direct I/O base support for
406 To compile this driver as a module, choose M here: the
407 module will be called qdio.
413 prompt "Support for CHSC subchannels"
415 This driver allows usage of CHSC subchannels. A CHSC subchannel
416 is usually present on LPAR only.
417 The driver creates a device /dev/chsc, which may be used to
418 obtain I/O configuration information about the machine and
419 to issue asynchronous chsc commands (DANGEROUS).
420 You will usually only want to use this interface on a special
421 LPAR designated for system management.
423 To compile this driver as a module, choose M here: the
424 module will be called chsc_sch.
430 source "fs/Kconfig.binfmt"
432 config FORCE_MAX_ZONEORDER
438 prompt "Pseudo page fault support"
440 Select this option, if you want to use PFAULT pseudo page fault
441 handling under VM. If running native or in LPAR, this option
442 has no effect. If your VM does not support PFAULT, PAGEEX
443 pseudo page fault handling will be used.
444 Note that VM 4.2 supports PFAULT but has a bug in its
445 implementation that causes some problems.
446 Everybody who wants to run Linux under VM != VM4.2 should select
451 prompt "VM shared kernel support"
453 Select this option, if you want to share the text segment of the
454 Linux kernel between different VM guests. This reduces memory
455 usage with lots of guests but greatly increases kernel size.
456 Also if a kernel was IPL'ed from a shared segment the kexec system
458 You should only select this option if you know what you are
459 doing and want to exploit this feature.
463 prompt "Cooperative memory management"
465 Select this option, if you want to enable the kernel interface
466 to reduce the memory size of the system. This is accomplished
467 by allocating pages of memory and put them "on hold". This only
468 makes sense for a system running under VM where the unused pages
469 will be reused by VM for other guest systems. The interface
470 allows an external monitor to balance memory of many systems.
471 Everybody who wants to run Linux under VM should select this
476 prompt "IUCV special message interface to cooperative memory management"
477 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
479 Select this option to enable the special message interface to
480 the cooperative memory management.
484 prompt "Linux - VM Monitor Stream, base infrastructure"
487 This provides a kernel interface for creating and updating z/VM APPLDATA
488 monitor records. The monitor records are updated at certain time
489 intervals, once the timer is started.
490 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
491 i.e. enables or disables monitoring on the Linux side.
492 A custom interval value (in seconds) can be written to
493 /proc/appldata/interval.
495 Defaults are 60 seconds interval and timer off.
496 The /proc entries can also be read from, showing the current settings.
500 prompt "Monitor memory management statistics"
501 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
503 This provides memory management related data to the Linux - VM Monitor
504 Stream, like paging/swapping rate, memory utilisation, etc.
505 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
506 APPLDATA monitor record, i.e. enables or disables monitoring this record
510 The /proc entry can also be read from, showing the current settings.
512 This can also be compiled as a module, which will be called
517 prompt "Monitor OS statistics"
518 depends on APPLDATA_BASE
520 This provides OS related data to the Linux - VM Monitor Stream, like
521 CPU utilisation, etc.
522 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
523 APPLDATA monitor record, i.e. enables or disables monitoring this record
527 This can also be compiled as a module, which will be called
530 config APPLDATA_NET_SUM
532 prompt "Monitor overall network statistics"
533 depends on APPLDATA_BASE && NET
535 This provides network related data to the Linux - VM Monitor Stream,
536 currently there is only a total sum of network I/O statistics, no
538 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
539 APPLDATA monitor record, i.e. enables or disables monitoring this record
543 This can also be compiled as a module, which will be called
546 source kernel/Kconfig.hz
550 prompt "s390 hypervisor file system support"
551 select SYS_HYPERVISOR
553 This is a virtual file system intended to provide accounting
554 information in an s390 hypervisor environment.
558 prompt "kexec system call"
560 kexec is a system call that implements the ability to shutdown your
561 current kernel, and to start another kernel. It is like a reboot
562 but is independent of hardware/microcode support.
565 bool "kernel crash dumps"
566 depends on 64BIT && SMP
569 Generate crash dump after being started by kexec.
570 Crash dump kernels are loaded in the main kernel with kexec-tools
571 into a specially reserved region and then later executed after
572 a crash by kdump/kexec.
573 For more details see Documentation/kdump/kdump.txt
577 prompt "zfcpdump support"
580 Select this option if you want to build an zfcpdump enabled kernel.
581 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
585 prompt "s390 guest support for KVM (EXPERIMENTAL)"
586 depends on 64BIT && EXPERIMENTAL
587 select VIRTUALIZATION
590 select VIRTIO_CONSOLE
592 Select this option if you want to run the kernel as a guest under
593 the KVM hypervisor. This will add detection for KVM as well as a
594 virtio transport. If KVM is detected, the virtio console will be
599 prompt "Enable seccomp to safely compute untrusted bytecode"
602 This kernel feature is useful for number crunching applications
603 that may need to compute untrusted bytecode during their
604 execution. By using pipes or other transports made available to
605 the process as file descriptors supporting the read/write
606 syscalls, it's possible to isolate those applications in
607 their own address space using seccomp. Once seccomp is
608 enabled via /proc/<pid>/seccomp, it cannot be disabled
609 and the task is only allowed to execute a few safe syscalls
610 defined by each seccomp mode.
616 menu "Power Management"
618 source "kernel/power/Kconfig"
630 source "drivers/Kconfig"
634 source "arch/s390/Kconfig.debug"
636 source "security/Kconfig"
638 source "crypto/Kconfig"
642 source "arch/s390/kvm/Kconfig"