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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#
2# For a description of the syntax of this configuration file,
3# see Documentation/kbuild/kconfig-language.txt.
4#
5
Heiko Carstensdbd70fb2008-04-17 07:46:12 +02006config SCHED_MC
7 def_bool y
8 depends on SMP
9
Linus Torvalds1da177e2005-04-16 15:20:36 -070010config MMU
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020011 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -070012
Christoph Lameter66701b12007-02-10 01:43:09 -080013config ZONE_DMA
Heiko Carstens118bcd32007-02-21 10:55:12 +010014 def_bool y
15 depends on 64BIT
Christoph Lameter66701b12007-02-10 01:43:09 -080016
Ingo Molnar2b105ff2006-07-03 00:25:02 -070017config LOCKDEP_SUPPORT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020018 def_bool y
Ingo Molnar2b105ff2006-07-03 00:25:02 -070019
Heiko Carstens5bdc9b42006-07-03 00:24:41 -070020config STACKTRACE_SUPPORT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020021 def_bool y
Heiko Carstens5bdc9b42006-07-03 00:24:41 -070022
Heiko Carstensa3afe702008-02-05 16:50:45 +010023config HAVE_LATENCYTOP_SUPPORT
24 def_bool y
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026config RWSEM_GENERIC_SPINLOCK
27 bool
28
29config RWSEM_XCHGADD_ALGORITHM
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020030 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
David Howellsf0d1b0b2006-12-08 02:37:49 -080032config ARCH_HAS_ILOG2_U32
33 bool
34 default n
35
36config ARCH_HAS_ILOG2_U64
37 bool
38 default n
39
Akinobu Mita7e33db42006-03-26 01:39:34 -080040config GENERIC_HWEIGHT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020041 def_bool y
Akinobu Mita7e33db42006-03-26 01:39:34 -080042
Martin Schwidefskydc64bef2006-10-06 16:38:48 +020043config GENERIC_TIME
44 def_bool y
45
Heiko Carstens5a62b192008-04-17 07:46:25 +020046config GENERIC_CLOCKEVENTS
47 def_bool y
48
Heiko Carstensc0007f12007-04-27 16:01:42 +020049config GENERIC_BUG
50 bool
51 depends on BUG
52 default y
53
Al Viro23db7642007-02-11 18:15:29 +000054config NO_IOMEM
Al Viro5ea81762007-02-11 15:41:31 +000055 def_bool y
56
Heiko Carstens411f0f32007-05-06 14:49:09 -070057config NO_DMA
58 def_bool y
59
Martin Schwidefskyb6b40c52008-02-05 16:50:42 +010060config GENERIC_LOCKBREAK
61 bool
62 default y
63 depends on SMP && PREEMPT
64
Carsten Otte402b0862008-03-25 18:47:10 +010065config PGSTE
66 bool
67 default y if KVM
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069mainmenu "Linux Kernel Configuration"
70
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080071config S390
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020072 def_bool y
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050073 select HAVE_OPROFILE
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050074 select HAVE_KPROBES
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080075 select HAVE_KRETPROBES
Christian Borntraeger77b455f2008-03-25 18:47:36 +010076 select HAVE_KVM if 64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Linus Torvalds1da177e2005-04-16 15:20:36 -070078source "init/Kconfig"
79
80menu "Base setup"
81
82comment "Processor type and features"
83
Heiko Carstens5a62b192008-04-17 07:46:25 +020084source "kernel/time/Kconfig"
85
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080086config 64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 bool "64 bit kernel"
88 help
89 Select this option if you have a 64 bit IBM zSeries machine
90 and want to use the 64 bit addressing mode.
91
Martin Schwidefskyd9f7a742006-09-28 16:55:39 +020092config 32BIT
93 bool
94 default y if !64BIT
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096config SMP
97 bool "Symmetric multi-processing support"
98 ---help---
99 This enables support for systems with more than one CPU. If you have
100 a system with only one CPU, like most personal computers, say N. If
101 you have a system with more than one CPU, say Y.
102
103 If you say N here, the kernel will run on single and multiprocessor
104 machines, but will use only one CPU of a multiprocessor machine. If
105 you say Y here, the kernel will run on many, but not all,
106 singleprocessor machines. On a singleprocessor machine, the kernel
107 will run faster if you say N here.
108
Adrian Bunk03502fa2008-02-03 15:50:21 +0200109 See also the SMP-HOWTO available at
110 <http://www.tldp.org/docs.html#howto>.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
112 Even if you don't know what to do here, say Y.
113
114config NR_CPUS
115 int "Maximum number of CPUs (2-64)"
116 range 2 64
117 depends on SMP
Heiko Carstens057c5cb2008-02-19 15:29:25 +0100118 default "32" if !64BIT
119 default "64" if 64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 help
121 This allows you to specify the maximum number of CPUs which this
122 kernel will support. The maximum supported value is 64 and the
123 minimum value which makes sense is 2.
124
125 This is purely to save memory - each supported CPU adds
126 approximately sixteen kilobytes to the kernel image.
127
128config HOTPLUG_CPU
129 bool "Support for hot-pluggable CPUs"
130 depends on SMP
131 select HOTPLUG
132 default n
133 help
134 Say Y here to be able to turn CPUs off and on. CPUs
135 can be controlled through /sys/devices/system/cpu/cpu#.
136 Say N if you want to disable CPU hotplug.
137
138config MATHEMU
139 bool "IEEE FPU emulation"
140 depends on MARCH_G5
141 help
142 This option is required for IEEE compliant floating point arithmetic
143 on older S/390 machines. Say Y unless you know your machine doesn't
144 need this.
145
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800146config COMPAT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 bool "Kernel support for 31 bit emulation"
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800148 depends on 64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 help
150 Select this option if you want to enable your system kernel to
151 handle system-calls from ELF binaries for 31 bit ESA. This option
152 (and some other stuff like libraries and such) is needed for
153 executing 31 bit applications. It is safe to say "Y".
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155config SYSVIPC_COMPAT
156 bool
157 depends on COMPAT && SYSVIPC
158 default y
159
Al Viroe65e1fc2006-09-12 03:04:40 -0400160config AUDIT_ARCH
161 bool
162 default y
163
Gerald Schaeferc1821c22007-02-05 21:18:17 +0100164config S390_SWITCH_AMODE
165 bool "Switch kernel/user addressing modes"
166 help
167 This option allows to switch the addressing modes of kernel and user
168 space. The kernel parameter switch_amode=on will enable this feature,
169 default is disabled. Enabling this (via kernel parameter) on machines
170 earlier than IBM System z9-109 EC/BC will reduce system performance.
171
172 Note that this option will also be selected by selecting the execute
173 protection option below. Enabling the execute protection via the
174 noexec kernel parameter will also switch the addressing modes,
175 independent of the switch_amode kernel parameter.
176
177
178config S390_EXEC_PROTECT
179 bool "Data execute protection"
180 select S390_SWITCH_AMODE
181 help
182 This option allows to enable a buffer overflow protection for user
183 space programs and it also selects the addressing mode option above.
184 The kernel parameter noexec=on will enable this feature and also
185 switch the addressing modes, default is disabled. Enabling this (via
186 kernel parameter) on machines earlier than IBM System z9-109 EC/BC
187 will reduce system performance.
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189comment "Code generation options"
190
191choice
192 prompt "Processor type"
193 default MARCH_G5
194
195config MARCH_G5
196 bool "S/390 model G5 and G6"
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800197 depends on !64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 help
199 Select this to build a 31 bit kernel that works
200 on all S/390 and zSeries machines.
201
202config MARCH_Z900
203 bool "IBM eServer zSeries model z800 and z900"
204 help
205 Select this to optimize for zSeries machines. This
206 will enable some optimizations that are not available
207 on older 31 bit only CPUs.
208
209config MARCH_Z990
210 bool "IBM eServer zSeries model z890 and z990"
211 help
212 Select this enable optimizations for model z890/z990.
213 This will be slightly faster but does not work on
214 older machines such as the z900.
215
Christian Borntraeger0efa4702006-09-28 16:55:46 +0200216config MARCH_Z9_109
217 bool "IBM System z9"
218 help
219 Select this to enable optimizations for IBM System z9-109, IBM
220 System z9 Enterprise Class (z9 EC), and IBM System z9 Business
221 Class (z9 BC). The kernel will be slightly faster but will not
222 work on older machines such as the z990, z890, z900, and z800.
223
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224endchoice
225
226config PACK_STACK
227 bool "Pack kernel stack"
228 help
229 This option enables the compiler option -mkernel-backchain if it
230 is available. If the option is available the compiler supports
231 the new stack layout which dramatically reduces the minimum stack
232 frame size. With an old compiler a non-leaf function needs a
233 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
234 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
235 and 24 byte on 64 bit.
236
237 Say Y if you are unsure.
238
239config SMALL_STACK
240 bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb"
Heiko Carstens74f8f552006-12-04 15:41:10 +0100241 depends on PACK_STACK && !LOCKDEP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 help
243 If you say Y here and the compiler supports the -mkernel-backchain
244 option the kernel will use a smaller kernel stack size. For 31 bit
245 the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb
246 instead of 16kb. This allows to run more thread on a system and
247 reduces the pressure on the memory management for higher order
248 page allocations.
249
250 Say N if you are unsure.
251
252
253config CHECK_STACK
254 bool "Detect kernel stack overflow"
255 help
256 This option enables the compiler option -mstack-guard and
257 -mstack-size if they are available. If the compiler supports them
258 it will emit additional code to each function prolog to trigger
259 an illegal operation if the kernel stack is about to overflow.
260
261 Say N if you are unsure.
262
263config STACK_GUARD
264 int "Size of the guard area (128-1024)"
265 range 128 1024
266 depends on CHECK_STACK
267 default "256"
268 help
269 This allows you to specify the size of the guard area at the lower
270 end of the kernel stack. If the kernel stack points into the guard
271 area on function entry an illegal operation is triggered. The size
272 needs to be a power of 2. Please keep in mind that the size of an
273 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
274 The minimum size for the stack guard should be 256 for 31 bit and
275 512 for 64 bit.
276
277config WARN_STACK
278 bool "Emit compiler warnings for function with broken stack usage"
279 help
280 This option enables the compiler options -mwarn-framesize and
281 -mwarn-dynamicstack. If the compiler supports these options it
282 will generate warnings for function which either use alloca or
283 create a stack frame bigger then CONFIG_WARN_STACK_SIZE.
284
285 Say N if you are unsure.
286
287config WARN_STACK_SIZE
288 int "Maximum frame size considered safe (128-2048)"
289 range 128 2048
290 depends on WARN_STACK
291 default "256"
292 help
293 This allows you to specify the maximum frame size a function may
294 have without the compiler complaining about it.
295
Heiko Carstens39b742f2006-12-08 15:56:10 +0100296config ARCH_POPULATES_NODE_MAP
297 def_bool y
298
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200299comment "Kernel preemption"
300
301source "kernel/Kconfig.preempt"
302
Heiko Carstens17f34582008-04-30 13:38:47 +0200303config ARCH_SPARSEMEM_ENABLE
304 def_bool y
305 select SPARSEMEM_VMEMMAP_ENABLE
306 select SPARSEMEM_VMEMMAP
307
308config ARCH_SPARSEMEM_DEFAULT
309 def_bool y
310
Dave Hansen3f22ab22005-06-23 00:07:43 -0700311source "mm/Kconfig"
312
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313comment "I/O subsystem configuration"
314
315config MACHCHK_WARNING
316 bool "Process warning machine checks"
317 help
318 Select this option if you want the machine check handler on IBM S/390 or
319 zSeries to process warning machine checks (e.g. on power failures).
320 If unsure, say "Y".
321
322config QDIO
323 tristate "QDIO support"
324 ---help---
Frank Pavlic8129ee12006-01-06 00:19:20 -0800325 This driver provides the Queued Direct I/O base support for
Ursula Braunefca13b2008-04-17 07:46:19 +0200326 IBM System z.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 To compile this driver as a module, choose M here: the
329 module will be called qdio.
330
331 If unsure, say Y.
332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333config QDIO_DEBUG
334 bool "Extended debugging information"
335 depends on QDIO
336 help
Frank Pavlic8129ee12006-01-06 00:19:20 -0800337 Say Y here to get extended debugging output in
338 /sys/kernel/debug/s390dbf/qdio...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 Warning: this option reduces the performance of the QDIO module.
340
341 If unsure, say N.
342
343comment "Misc"
344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345config IPL
346 bool "Builtin IPL record support"
347 help
348 If you want to use the produced kernel to IPL directly from a
349 device, you have to merge a bootsector specific to the device
350 into the first bytes of the kernel. You will have to select the
351 IPL device.
352
353choice
354 prompt "IPL method generated into head.S"
355 depends on IPL
356 default IPL_TAPE
357 help
358 Select "tape" if you want to IPL the image from a Tape.
359
360 Select "vm_reader" if you are running under VM/ESA and want
361 to IPL the image from the emulated card reader.
362
363config IPL_TAPE
364 bool "tape"
365
366config IPL_VM
367 bool "vm_reader"
368
369endchoice
370
371source "fs/Kconfig.binfmt"
372
Heiko Carstens684de392008-03-05 12:37:14 +0100373config FORCE_MAX_ZONEORDER
374 int
375 default "9"
376
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377config PROCESS_DEBUG
378 bool "Show crashed user process info"
379 help
380 Say Y to print all process fault locations to the console. This is
381 a debugging option; you probably do not want to set it unless you
382 are an S390 port maintainer.
383
384config PFAULT
385 bool "Pseudo page fault support"
386 help
387 Select this option, if you want to use PFAULT pseudo page fault
388 handling under VM. If running native or in LPAR, this option
389 has no effect. If your VM does not support PFAULT, PAGEEX
390 pseudo page fault handling will be used.
391 Note that VM 4.2 supports PFAULT but has a bug in its
392 implementation that causes some problems.
393 Everybody who wants to run Linux under VM != VM4.2 should select
394 this option.
395
396config SHARED_KERNEL
397 bool "VM shared kernel support"
398 help
399 Select this option, if you want to share the text segment of the
400 Linux kernel between different VM guests. This reduces memory
401 usage with lots of guests but greatly increases kernel size.
Heiko Carstens9c9c1762007-03-05 23:35:45 +0100402 Also if a kernel was IPL'ed from a shared segment the kexec system
403 call will not work.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 You should only select this option if you know what you are
405 doing and want to exploit this feature.
406
407config CMM
408 tristate "Cooperative memory management"
409 help
410 Select this option, if you want to enable the kernel interface
411 to reduce the memory size of the system. This is accomplished
412 by allocating pages of memory and put them "on hold". This only
413 makes sense for a system running under VM where the unused pages
414 will be reused by VM for other guest systems. The interface
415 allows an external monitor to balance memory of many systems.
416 Everybody who wants to run Linux under VM should select this
417 option.
418
419config CMM_PROC
420 bool "/proc interface to cooperative memory management"
421 depends on CMM
422 help
423 Select this option to enable the /proc interface to the
424 cooperative memory management.
425
426config CMM_IUCV
427 bool "IUCV special message interface to cooperative memory management"
428 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
429 help
430 Select this option to enable the special message interface to
431 the cooperative memory management.
432
433config VIRT_TIMER
434 bool "Virtual CPU timer support"
435 help
436 This provides a kernel interface for virtual CPU timers.
437 Default is disabled.
438
439config VIRT_CPU_ACCOUNTING
440 bool "Base user process accounting on virtual cpu timer"
441 depends on VIRT_TIMER
442 help
443 Select this option to use CPU timer deltas to do user
444 process accounting.
445
446config APPLDATA_BASE
447 bool "Linux - VM Monitor Stream, base infrastructure"
448 depends on PROC_FS && VIRT_TIMER=y
449 help
450 This provides a kernel interface for creating and updating z/VM APPLDATA
451 monitor records. The monitor records are updated at certain time
452 intervals, once the timer is started.
453 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
454 i.e. enables or disables monitoring on the Linux side.
455 A custom interval value (in seconds) can be written to
456 /proc/appldata/interval.
457
458 Defaults are 60 seconds interval and timer off.
459 The /proc entries can also be read from, showing the current settings.
460
461config APPLDATA_MEM
462 tristate "Monitor memory management statistics"
Al Viro62fb2ba2006-12-13 00:34:59 -0800463 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 help
465 This provides memory management related data to the Linux - VM Monitor
466 Stream, like paging/swapping rate, memory utilisation, etc.
467 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
468 APPLDATA monitor record, i.e. enables or disables monitoring this record
469 on the z/VM side.
470
471 Default is disabled.
472 The /proc entry can also be read from, showing the current settings.
473
474 This can also be compiled as a module, which will be called
475 appldata_mem.o.
476
477config APPLDATA_OS
478 tristate "Monitor OS statistics"
479 depends on APPLDATA_BASE
480 help
481 This provides OS related data to the Linux - VM Monitor Stream, like
482 CPU utilisation, etc.
483 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
484 APPLDATA monitor record, i.e. enables or disables monitoring this record
485 on the z/VM side.
486
487 Default is disabled.
488 This can also be compiled as a module, which will be called
489 appldata_os.o.
490
491config APPLDATA_NET_SUM
492 tristate "Monitor overall network statistics"
493 depends on APPLDATA_BASE
494 help
495 This provides network related data to the Linux - VM Monitor Stream,
496 currently there is only a total sum of network I/O statistics, no
497 per-interface data.
498 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
499 APPLDATA monitor record, i.e. enables or disables monitoring this record
500 on the z/VM side.
501
502 Default is disabled.
503 This can also be compiled as a module, which will be called
504 appldata_net_sum.o.
505
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200506source kernel/Kconfig.hz
507
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700508config S390_HYPFS_FS
509 bool "s390 hypervisor file system support"
510 select SYS_HYPERVISOR
511 default y
512 help
513 This is a virtual file system intended to provide accounting
514 information in an s390 hypervisor environment.
515
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700516config KEXEC
Heiko Carstens07d43ce2006-09-20 15:59:29 +0200517 bool "kexec system call"
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700518 help
519 kexec is a system call that implements the ability to shutdown your
520 current kernel, and to start another kernel. It is like a reboot
521 but is independent of hardware/microcode support.
522
Michael Holzheu411ed322007-04-27 16:01:49 +0200523config ZFCPDUMP
524 tristate "zfcpdump support"
525 select SMP
526 default n
527 help
528 Select this option if you want to build an zfcpdump enabled kernel.
Dirk Hohndele4031492007-10-30 13:37:19 -0700529 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
Michael Holzheu411ed322007-04-27 16:01:49 +0200530
Carsten Ottefa587742008-03-25 18:47:44 +0100531config S390_GUEST
532bool "s390 guest support (EXPERIMENTAL)"
533 depends on 64BIT && EXPERIMENTAL
534 select VIRTIO
535 select VIRTIO_RING
536 help
537 Select this option if you want to run the kernel under s390 linux
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538endmenu
539
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700540source "net/Kconfig"
541
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542config PCMCIA
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200543 def_bool n
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200545config CCW
546 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200548source "drivers/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
550source "fs/Kconfig"
551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552source "arch/s390/Kconfig.debug"
553
554source "security/Kconfig"
555
556source "crypto/Kconfig"
557
558source "lib/Kconfig"
Christian Borntraeger77b455f2008-03-25 18:47:36 +0100559
560source "arch/s390/kvm/Kconfig"