12 config LOCKDEP_SUPPORT
15 config STACKTRACE_SUPPORT
18 config HAVE_LATENCYTOP_SUPPORT
21 config RWSEM_GENERIC_SPINLOCK
24 config RWSEM_XCHGADD_ALGORITHM
27 config ARCH_HAS_ILOG2_U32
31 config ARCH_HAS_ILOG2_U64
35 config GENERIC_HWEIGHT
38 config GENERIC_TIME_VSYSCALL
41 config GENERIC_CLOCKEVENTS
49 config GENERIC_BUG_RELATIVE_POINTERS
58 config ARCH_DMA_ADDR_T_64BIT
61 config GENERIC_LOCKBREAK
64 depends on SMP && PREEMPT
70 config VIRT_CPU_ACCOUNTING
73 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
78 select USE_GENERIC_SMP_HELPERS if SMP
79 select HAVE_SYSCALL_WRAPPERS
80 select HAVE_FUNCTION_TRACER
81 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
82 select HAVE_FTRACE_MCOUNT_RECORD
83 select HAVE_SYSCALL_TRACEPOINTS
84 select HAVE_DYNAMIC_FTRACE
85 select HAVE_FUNCTION_GRAPH_TRACER
86 select HAVE_REGS_AND_STACK_ACCESS_API
87 select HAVE_DEFAULT_NO_SPIN_MUTEXES
90 select HAVE_KRETPROBES
91 select HAVE_KVM if 64BIT
92 select HAVE_ARCH_TRACEHOOK
93 select INIT_ALL_POSSIBLE
95 select HAVE_PERF_EVENTS
96 select HAVE_KERNEL_GZIP
97 select HAVE_KERNEL_BZIP2
98 select HAVE_KERNEL_LZMA
99 select HAVE_KERNEL_LZO
100 select HAVE_GET_USER_PAGES_FAST
101 select ARCH_INLINE_SPIN_TRYLOCK
102 select ARCH_INLINE_SPIN_TRYLOCK_BH
103 select ARCH_INLINE_SPIN_LOCK
104 select ARCH_INLINE_SPIN_LOCK_BH
105 select ARCH_INLINE_SPIN_LOCK_IRQ
106 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
107 select ARCH_INLINE_SPIN_UNLOCK
108 select ARCH_INLINE_SPIN_UNLOCK_BH
109 select ARCH_INLINE_SPIN_UNLOCK_IRQ
110 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
111 select ARCH_INLINE_READ_TRYLOCK
112 select ARCH_INLINE_READ_LOCK
113 select ARCH_INLINE_READ_LOCK_BH
114 select ARCH_INLINE_READ_LOCK_IRQ
115 select ARCH_INLINE_READ_LOCK_IRQSAVE
116 select ARCH_INLINE_READ_UNLOCK
117 select ARCH_INLINE_READ_UNLOCK_BH
118 select ARCH_INLINE_READ_UNLOCK_IRQ
119 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
120 select ARCH_INLINE_WRITE_TRYLOCK
121 select ARCH_INLINE_WRITE_LOCK
122 select ARCH_INLINE_WRITE_LOCK_BH
123 select ARCH_INLINE_WRITE_LOCK_IRQ
124 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
125 select ARCH_INLINE_WRITE_UNLOCK
126 select ARCH_INLINE_WRITE_UNLOCK_BH
127 select ARCH_INLINE_WRITE_UNLOCK_IRQ
128 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
130 config SCHED_OMIT_FRAME_POINTER
134 source "init/Kconfig"
136 source "kernel/Kconfig.freezer"
140 comment "Processor type and features"
142 source "kernel/time/Kconfig"
147 Select this option if you have a 64 bit IBM zSeries machine
148 and want to use the 64 bit addressing mode.
158 bool "Symmetric multi-processing support"
160 This enables support for systems with more than one CPU. If you have
161 a system with only one CPU, like most personal computers, say N. If
162 you have a system with more than one CPU, say Y.
164 If you say N here, the kernel will run on single and multiprocessor
165 machines, but will use only one CPU of a multiprocessor machine. If
166 you say Y here, the kernel will run on many, but not all,
167 singleprocessor machines. On a singleprocessor machine, the kernel
168 will run faster if you say N here.
170 See also the SMP-HOWTO available at
171 <http://www.tldp.org/docs.html#howto>.
173 Even if you don't know what to do here, say Y.
176 int "Maximum number of CPUs (2-64)"
179 default "32" if !64BIT
180 default "64" if 64BIT
182 This allows you to specify the maximum number of CPUs which this
183 kernel will support. The maximum supported value is 64 and the
184 minimum value which makes sense is 2.
186 This is purely to save memory - each supported CPU adds
187 approximately sixteen kilobytes to the kernel image.
190 bool "Support for hot-pluggable CPUs"
195 Say Y here to be able to turn CPUs off and on. CPUs
196 can be controlled through /sys/devices/system/cpu/cpu#.
197 Say N if you want to disable CPU hotplug.
200 bool "Book scheduler support"
203 Book scheduler support improves the CPU scheduler's decision making
204 when dealing with machines that have several books.
207 bool "IEEE FPU emulation"
210 This option is required for IEEE compliant floating point arithmetic
211 on older S/390 machines. Say Y unless you know your machine doesn't
215 bool "Kernel support for 31 bit emulation"
217 select COMPAT_BINFMT_ELF
219 Select this option if you want to enable your system kernel to
220 handle system-calls from ELF binaries for 31 bit ESA. This option
221 (and some other stuff like libraries and such) is needed for
222 executing 31 bit applications. It is safe to say "Y".
224 config SYSVIPC_COMPAT
226 depends on COMPAT && SYSVIPC
233 config S390_EXEC_PROTECT
234 bool "Data execute protection"
236 This option allows to enable a buffer overflow protection for user
237 space programs and it also selects the addressing mode option above.
238 The kernel parameter noexec=on will enable this feature and also
239 switch the addressing modes, default is disabled. Enabling this (via
240 kernel parameter) on machines earlier than IBM System z9-109 EC/BC
241 will reduce system performance.
243 comment "Code generation options"
246 prompt "Processor type"
250 bool "S/390 model G5 and G6"
253 Select this to build a 31 bit kernel that works
254 on all S/390 and zSeries machines.
257 bool "IBM eServer zSeries model z800 and z900"
259 Select this to optimize for zSeries machines. This
260 will enable some optimizations that are not available
261 on older 31 bit only CPUs.
264 bool "IBM eServer zSeries model z890 and z990"
266 Select this enable optimizations for model z890/z990.
267 This will be slightly faster but does not work on
268 older machines such as the z900.
273 Select this to enable optimizations for IBM System z9-109, IBM
274 System z9 Enterprise Class (z9 EC), and IBM System z9 Business
275 Class (z9 BC). The kernel will be slightly faster but will not
276 work on older machines such as the z990, z890, z900, and z800.
279 bool "IBM System z10"
281 Select this to enable optimizations for IBM System z10. The
282 kernel will be slightly faster but will not work on older
283 machines such as the z990, z890, z900, z800, z9-109, z9-ec
287 bool "IBM zEnterprise 196"
289 Select this to enable optimizations for IBM zEnterprise 196.
290 The kernel will be slightly faster but will not work on older
291 machines such as the z990, z890, z900, z800, z9-109, z9-ec,
292 z9-bc, z10-ec and z10-bc.
297 bool "Pack kernel stack"
299 This option enables the compiler option -mkernel-backchain if it
300 is available. If the option is available the compiler supports
301 the new stack layout which dramatically reduces the minimum stack
302 frame size. With an old compiler a non-leaf function needs a
303 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
304 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
305 and 24 byte on 64 bit.
307 Say Y if you are unsure.
310 bool "Use 8kb for kernel stack instead of 16kb"
311 depends on PACK_STACK && 64BIT && !LOCKDEP
313 If you say Y here and the compiler supports the -mkernel-backchain
314 option the kernel will use a smaller kernel stack size. The reduced
315 size is 8kb instead of 16kb. This allows to run more threads on a
316 system and reduces the pressure on the memory management for higher
317 order page allocations.
319 Say N if you are unsure.
322 bool "Detect kernel stack overflow"
324 This option enables the compiler option -mstack-guard and
325 -mstack-size if they are available. If the compiler supports them
326 it will emit additional code to each function prolog to trigger
327 an illegal operation if the kernel stack is about to overflow.
329 Say N if you are unsure.
332 int "Size of the guard area (128-1024)"
334 depends on CHECK_STACK
337 This allows you to specify the size of the guard area at the lower
338 end of the kernel stack. If the kernel stack points into the guard
339 area on function entry an illegal operation is triggered. The size
340 needs to be a power of 2. Please keep in mind that the size of an
341 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
342 The minimum size for the stack guard should be 256 for 31 bit and
346 bool "Emit compiler warnings for function with broken stack usage"
348 This option enables the compiler options -mwarn-framesize and
349 -mwarn-dynamicstack. If the compiler supports these options it
350 will generate warnings for function which either use alloca or
351 create a stack frame bigger than CONFIG_WARN_STACK_SIZE.
353 Say N if you are unsure.
355 config WARN_STACK_SIZE
356 int "Maximum frame size considered safe (128-2048)"
358 depends on WARN_STACK
361 This allows you to specify the maximum frame size a function may
362 have without the compiler complaining about it.
364 config ARCH_POPULATES_NODE_MAP
367 comment "Kernel preemption"
369 source "kernel/Kconfig.preempt"
371 config ARCH_SPARSEMEM_ENABLE
373 select SPARSEMEM_VMEMMAP_ENABLE
374 select SPARSEMEM_VMEMMAP
375 select SPARSEMEM_STATIC if !64BIT
377 config ARCH_SPARSEMEM_DEFAULT
380 config ARCH_SELECT_MEMORY_MODEL
383 config ARCH_ENABLE_MEMORY_HOTPLUG
387 config ARCH_ENABLE_MEMORY_HOTREMOVE
390 config ARCH_HIBERNATION_POSSIBLE
395 comment "I/O subsystem configuration"
398 tristate "QDIO support"
400 This driver provides the Queued Direct I/O base support for
403 To compile this driver as a module, choose M here: the
404 module will be called qdio.
409 tristate "Support for CHSC subchannels"
411 This driver allows usage of CHSC subchannels. A CHSC subchannel
412 is usually present on LPAR only.
413 The driver creates a device /dev/chsc, which may be used to
414 obtain I/O configuration information about the machine and
415 to issue asynchronous chsc commands (DANGEROUS).
416 You will usually only want to use this interface on a special
417 LPAR designated for system management.
419 To compile this driver as a module, choose M here: the
420 module will be called chsc_sch.
427 bool "Builtin IPL record support"
429 If you want to use the produced kernel to IPL directly from a
430 device, you have to merge a bootsector specific to the device
431 into the first bytes of the kernel. You will have to select the
435 prompt "IPL method generated into head.S"
439 Select "tape" if you want to IPL the image from a Tape.
441 Select "vm_reader" if you are running under VM/ESA and want
442 to IPL the image from the emulated card reader.
452 source "fs/Kconfig.binfmt"
454 config FORCE_MAX_ZONEORDER
459 bool "Pseudo page fault support"
461 Select this option, if you want to use PFAULT pseudo page fault
462 handling under VM. If running native or in LPAR, this option
463 has no effect. If your VM does not support PFAULT, PAGEEX
464 pseudo page fault handling will be used.
465 Note that VM 4.2 supports PFAULT but has a bug in its
466 implementation that causes some problems.
467 Everybody who wants to run Linux under VM != VM4.2 should select
471 bool "VM shared kernel support"
473 Select this option, if you want to share the text segment of the
474 Linux kernel between different VM guests. This reduces memory
475 usage with lots of guests but greatly increases kernel size.
476 Also if a kernel was IPL'ed from a shared segment the kexec system
478 You should only select this option if you know what you are
479 doing and want to exploit this feature.
482 tristate "Cooperative memory management"
484 Select this option, if you want to enable the kernel interface
485 to reduce the memory size of the system. This is accomplished
486 by allocating pages of memory and put them "on hold". This only
487 makes sense for a system running under VM where the unused pages
488 will be reused by VM for other guest systems. The interface
489 allows an external monitor to balance memory of many systems.
490 Everybody who wants to run Linux under VM should select this
494 bool "IUCV special message interface to cooperative memory management"
495 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
497 Select this option to enable the special message interface to
498 the cooperative memory management.
501 bool "Linux - VM Monitor Stream, base infrastructure"
504 This provides a kernel interface for creating and updating z/VM APPLDATA
505 monitor records. The monitor records are updated at certain time
506 intervals, once the timer is started.
507 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
508 i.e. enables or disables monitoring on the Linux side.
509 A custom interval value (in seconds) can be written to
510 /proc/appldata/interval.
512 Defaults are 60 seconds interval and timer off.
513 The /proc entries can also be read from, showing the current settings.
516 tristate "Monitor memory management statistics"
517 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
519 This provides memory management related data to the Linux - VM Monitor
520 Stream, like paging/swapping rate, memory utilisation, etc.
521 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
522 APPLDATA monitor record, i.e. enables or disables monitoring this record
526 The /proc entry can also be read from, showing the current settings.
528 This can also be compiled as a module, which will be called
532 tristate "Monitor OS statistics"
533 depends on APPLDATA_BASE
535 This provides OS related data to the Linux - VM Monitor Stream, like
536 CPU utilisation, etc.
537 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
538 APPLDATA monitor record, i.e. enables or disables monitoring this record
542 This can also be compiled as a module, which will be called
545 config APPLDATA_NET_SUM
546 tristate "Monitor overall network statistics"
547 depends on APPLDATA_BASE && NET
549 This provides network related data to the Linux - VM Monitor Stream,
550 currently there is only a total sum of network I/O statistics, no
552 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
553 APPLDATA monitor record, i.e. enables or disables monitoring this record
557 This can also be compiled as a module, which will be called
560 source kernel/Kconfig.hz
563 bool "s390 hypervisor file system support"
564 select SYS_HYPERVISOR
567 This is a virtual file system intended to provide accounting
568 information in an s390 hypervisor environment.
571 bool "kexec system call"
573 kexec is a system call that implements the ability to shutdown your
574 current kernel, and to start another kernel. It is like a reboot
575 but is independent of hardware/microcode support.
578 bool "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.
586 bool "s390 guest support for KVM (EXPERIMENTAL)"
587 depends on 64BIT && EXPERIMENTAL
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
598 bool "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"