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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
6config MMU
Martin Schwidefsky61d48c22007-05-10 15:46:00 +02007 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -07008
Christoph Lameter66701b12007-02-10 01:43:09 -08009config ZONE_DMA
Heiko Carstens118bcd32007-02-21 10:55:12 +010010 def_bool y
11 depends on 64BIT
Christoph Lameter66701b12007-02-10 01:43:09 -080012
Ingo Molnar2b105ff2006-07-03 00:25:02 -070013config LOCKDEP_SUPPORT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020014 def_bool y
Ingo Molnar2b105ff2006-07-03 00:25:02 -070015
Heiko Carstens5bdc9b42006-07-03 00:24:41 -070016config STACKTRACE_SUPPORT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020017 def_bool y
Heiko Carstens5bdc9b42006-07-03 00:24:41 -070018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019config RWSEM_GENERIC_SPINLOCK
20 bool
21
22config RWSEM_XCHGADD_ALGORITHM
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020023 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
David Howellsf0d1b0b2006-12-08 02:37:49 -080025config ARCH_HAS_ILOG2_U32
26 bool
27 default n
28
29config ARCH_HAS_ILOG2_U64
30 bool
31 default n
32
Akinobu Mita7e33db42006-03-26 01:39:34 -080033config GENERIC_HWEIGHT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020034 def_bool y
Akinobu Mita7e33db42006-03-26 01:39:34 -080035
Martin Schwidefskydc64bef2006-10-06 16:38:48 +020036config GENERIC_TIME
37 def_bool y
38
Heiko Carstensc0007f12007-04-27 16:01:42 +020039config GENERIC_BUG
40 bool
41 depends on BUG
42 default y
43
Al Viro23db7642007-02-11 18:15:29 +000044config NO_IOMEM
Al Viro5ea81762007-02-11 15:41:31 +000045 def_bool y
46
Heiko Carstens411f0f32007-05-06 14:49:09 -070047config NO_DMA
48 def_bool y
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050mainmenu "Linux Kernel Configuration"
51
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080052config S390
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020053 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Linus Torvalds1da177e2005-04-16 15:20:36 -070055source "init/Kconfig"
56
57menu "Base setup"
58
59comment "Processor type and features"
60
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080061config 64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 bool "64 bit kernel"
63 help
64 Select this option if you have a 64 bit IBM zSeries machine
65 and want to use the 64 bit addressing mode.
66
Martin Schwidefskyd9f7a742006-09-28 16:55:39 +020067config 32BIT
68 bool
69 default y if !64BIT
70
Linus Torvalds1da177e2005-04-16 15:20:36 -070071config SMP
72 bool "Symmetric multi-processing support"
73 ---help---
74 This enables support for systems with more than one CPU. If you have
75 a system with only one CPU, like most personal computers, say N. If
76 you have a system with more than one CPU, say Y.
77
78 If you say N here, the kernel will run on single and multiprocessor
79 machines, but will use only one CPU of a multiprocessor machine. If
80 you say Y here, the kernel will run on many, but not all,
81 singleprocessor machines. On a singleprocessor machine, the kernel
82 will run faster if you say N here.
83
84 See also the <file:Documentation/smp.txt> and the SMP-HOWTO
85 available at <http://www.tldp.org/docs.html#howto>.
86
87 Even if you don't know what to do here, say Y.
88
89config NR_CPUS
90 int "Maximum number of CPUs (2-64)"
91 range 2 64
92 depends on SMP
93 default "32"
94 help
95 This allows you to specify the maximum number of CPUs which this
96 kernel will support. The maximum supported value is 64 and the
97 minimum value which makes sense is 2.
98
99 This is purely to save memory - each supported CPU adds
100 approximately sixteen kilobytes to the kernel image.
101
102config HOTPLUG_CPU
103 bool "Support for hot-pluggable CPUs"
104 depends on SMP
105 select HOTPLUG
106 default n
107 help
108 Say Y here to be able to turn CPUs off and on. CPUs
109 can be controlled through /sys/devices/system/cpu/cpu#.
110 Say N if you want to disable CPU hotplug.
111
112config MATHEMU
113 bool "IEEE FPU emulation"
114 depends on MARCH_G5
115 help
116 This option is required for IEEE compliant floating point arithmetic
117 on older S/390 machines. Say Y unless you know your machine doesn't
118 need this.
119
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800120config COMPAT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 bool "Kernel support for 31 bit emulation"
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800122 depends on 64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 help
124 Select this option if you want to enable your system kernel to
125 handle system-calls from ELF binaries for 31 bit ESA. This option
126 (and some other stuff like libraries and such) is needed for
127 executing 31 bit applications. It is safe to say "Y".
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129config SYSVIPC_COMPAT
130 bool
131 depends on COMPAT && SYSVIPC
132 default y
133
Al Viroe65e1fc2006-09-12 03:04:40 -0400134config AUDIT_ARCH
135 bool
136 default y
137
Gerald Schaeferc1821c22007-02-05 21:18:17 +0100138config S390_SWITCH_AMODE
139 bool "Switch kernel/user addressing modes"
140 help
141 This option allows to switch the addressing modes of kernel and user
142 space. The kernel parameter switch_amode=on will enable this feature,
143 default is disabled. Enabling this (via kernel parameter) on machines
144 earlier than IBM System z9-109 EC/BC will reduce system performance.
145
146 Note that this option will also be selected by selecting the execute
147 protection option below. Enabling the execute protection via the
148 noexec kernel parameter will also switch the addressing modes,
149 independent of the switch_amode kernel parameter.
150
151
152config S390_EXEC_PROTECT
153 bool "Data execute protection"
154 select S390_SWITCH_AMODE
155 help
156 This option allows to enable a buffer overflow protection for user
157 space programs and it also selects the addressing mode option above.
158 The kernel parameter noexec=on will enable this feature and also
159 switch the addressing modes, default is disabled. Enabling this (via
160 kernel parameter) on machines earlier than IBM System z9-109 EC/BC
161 will reduce system performance.
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163comment "Code generation options"
164
165choice
166 prompt "Processor type"
167 default MARCH_G5
168
169config MARCH_G5
170 bool "S/390 model G5 and G6"
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800171 depends on !64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 help
173 Select this to build a 31 bit kernel that works
174 on all S/390 and zSeries machines.
175
176config MARCH_Z900
177 bool "IBM eServer zSeries model z800 and z900"
178 help
179 Select this to optimize for zSeries machines. This
180 will enable some optimizations that are not available
181 on older 31 bit only CPUs.
182
183config MARCH_Z990
184 bool "IBM eServer zSeries model z890 and z990"
185 help
186 Select this enable optimizations for model z890/z990.
187 This will be slightly faster but does not work on
188 older machines such as the z900.
189
Christian Borntraeger0efa4702006-09-28 16:55:46 +0200190config MARCH_Z9_109
191 bool "IBM System z9"
192 help
193 Select this to enable optimizations for IBM System z9-109, IBM
194 System z9 Enterprise Class (z9 EC), and IBM System z9 Business
195 Class (z9 BC). The kernel will be slightly faster but will not
196 work on older machines such as the z990, z890, z900, and z800.
197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198endchoice
199
200config PACK_STACK
201 bool "Pack kernel stack"
202 help
203 This option enables the compiler option -mkernel-backchain if it
204 is available. If the option is available the compiler supports
205 the new stack layout which dramatically reduces the minimum stack
206 frame size. With an old compiler a non-leaf function needs a
207 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
208 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
209 and 24 byte on 64 bit.
210
211 Say Y if you are unsure.
212
213config SMALL_STACK
214 bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb"
Heiko Carstens74f8f552006-12-04 15:41:10 +0100215 depends on PACK_STACK && !LOCKDEP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 help
217 If you say Y here and the compiler supports the -mkernel-backchain
218 option the kernel will use a smaller kernel stack size. For 31 bit
219 the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb
220 instead of 16kb. This allows to run more thread on a system and
221 reduces the pressure on the memory management for higher order
222 page allocations.
223
224 Say N if you are unsure.
225
226
227config CHECK_STACK
228 bool "Detect kernel stack overflow"
229 help
230 This option enables the compiler option -mstack-guard and
231 -mstack-size if they are available. If the compiler supports them
232 it will emit additional code to each function prolog to trigger
233 an illegal operation if the kernel stack is about to overflow.
234
235 Say N if you are unsure.
236
237config STACK_GUARD
238 int "Size of the guard area (128-1024)"
239 range 128 1024
240 depends on CHECK_STACK
241 default "256"
242 help
243 This allows you to specify the size of the guard area at the lower
244 end of the kernel stack. If the kernel stack points into the guard
245 area on function entry an illegal operation is triggered. The size
246 needs to be a power of 2. Please keep in mind that the size of an
247 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
248 The minimum size for the stack guard should be 256 for 31 bit and
249 512 for 64 bit.
250
251config WARN_STACK
252 bool "Emit compiler warnings for function with broken stack usage"
253 help
254 This option enables the compiler options -mwarn-framesize and
255 -mwarn-dynamicstack. If the compiler supports these options it
256 will generate warnings for function which either use alloca or
257 create a stack frame bigger then CONFIG_WARN_STACK_SIZE.
258
259 Say N if you are unsure.
260
261config WARN_STACK_SIZE
262 int "Maximum frame size considered safe (128-2048)"
263 range 128 2048
264 depends on WARN_STACK
265 default "256"
266 help
267 This allows you to specify the maximum frame size a function may
268 have without the compiler complaining about it.
269
Heiko Carstens39b742f2006-12-08 15:56:10 +0100270config ARCH_POPULATES_NODE_MAP
271 def_bool y
272
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200273comment "Kernel preemption"
274
275source "kernel/Kconfig.preempt"
276
Dave Hansen3f22ab22005-06-23 00:07:43 -0700277source "mm/Kconfig"
278
Heiko Carstensf4eb07c2006-12-08 15:56:07 +0100279config HOLES_IN_ZONE
280 def_bool y
281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282comment "I/O subsystem configuration"
283
284config MACHCHK_WARNING
285 bool "Process warning machine checks"
286 help
287 Select this option if you want the machine check handler on IBM S/390 or
288 zSeries to process warning machine checks (e.g. on power failures).
289 If unsure, say "Y".
290
291config QDIO
292 tristate "QDIO support"
293 ---help---
Frank Pavlic8129ee12006-01-06 00:19:20 -0800294 This driver provides the Queued Direct I/O base support for
295 IBM mainframes.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 For details please refer to the documentation provided by IBM at
298 <http://www10.software.ibm.com/developerworks/opensource/linux390>
299
300 To compile this driver as a module, choose M here: the
301 module will be called qdio.
302
303 If unsure, say Y.
304
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305config QDIO_DEBUG
306 bool "Extended debugging information"
307 depends on QDIO
308 help
Frank Pavlic8129ee12006-01-06 00:19:20 -0800309 Say Y here to get extended debugging output in
310 /sys/kernel/debug/s390dbf/qdio...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 Warning: this option reduces the performance of the QDIO module.
312
313 If unsure, say N.
314
315comment "Misc"
316
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317config IPL
318 bool "Builtin IPL record support"
319 help
320 If you want to use the produced kernel to IPL directly from a
321 device, you have to merge a bootsector specific to the device
322 into the first bytes of the kernel. You will have to select the
323 IPL device.
324
325choice
326 prompt "IPL method generated into head.S"
327 depends on IPL
328 default IPL_TAPE
329 help
330 Select "tape" if you want to IPL the image from a Tape.
331
332 Select "vm_reader" if you are running under VM/ESA and want
333 to IPL the image from the emulated card reader.
334
335config IPL_TAPE
336 bool "tape"
337
338config IPL_VM
339 bool "vm_reader"
340
341endchoice
342
343source "fs/Kconfig.binfmt"
344
345config PROCESS_DEBUG
346 bool "Show crashed user process info"
347 help
348 Say Y to print all process fault locations to the console. This is
349 a debugging option; you probably do not want to set it unless you
350 are an S390 port maintainer.
351
352config PFAULT
353 bool "Pseudo page fault support"
354 help
355 Select this option, if you want to use PFAULT pseudo page fault
356 handling under VM. If running native or in LPAR, this option
357 has no effect. If your VM does not support PFAULT, PAGEEX
358 pseudo page fault handling will be used.
359 Note that VM 4.2 supports PFAULT but has a bug in its
360 implementation that causes some problems.
361 Everybody who wants to run Linux under VM != VM4.2 should select
362 this option.
363
364config SHARED_KERNEL
365 bool "VM shared kernel support"
366 help
367 Select this option, if you want to share the text segment of the
368 Linux kernel between different VM guests. This reduces memory
369 usage with lots of guests but greatly increases kernel size.
Heiko Carstens9c9c1762007-03-05 23:35:45 +0100370 Also if a kernel was IPL'ed from a shared segment the kexec system
371 call will not work.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 You should only select this option if you know what you are
373 doing and want to exploit this feature.
374
375config CMM
376 tristate "Cooperative memory management"
377 help
378 Select this option, if you want to enable the kernel interface
379 to reduce the memory size of the system. This is accomplished
380 by allocating pages of memory and put them "on hold". This only
381 makes sense for a system running under VM where the unused pages
382 will be reused by VM for other guest systems. The interface
383 allows an external monitor to balance memory of many systems.
384 Everybody who wants to run Linux under VM should select this
385 option.
386
387config CMM_PROC
388 bool "/proc interface to cooperative memory management"
389 depends on CMM
390 help
391 Select this option to enable the /proc interface to the
392 cooperative memory management.
393
394config CMM_IUCV
395 bool "IUCV special message interface to cooperative memory management"
396 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
397 help
398 Select this option to enable the special message interface to
399 the cooperative memory management.
400
401config VIRT_TIMER
402 bool "Virtual CPU timer support"
403 help
404 This provides a kernel interface for virtual CPU timers.
405 Default is disabled.
406
407config VIRT_CPU_ACCOUNTING
408 bool "Base user process accounting on virtual cpu timer"
409 depends on VIRT_TIMER
410 help
411 Select this option to use CPU timer deltas to do user
412 process accounting.
413
414config APPLDATA_BASE
415 bool "Linux - VM Monitor Stream, base infrastructure"
416 depends on PROC_FS && VIRT_TIMER=y
417 help
418 This provides a kernel interface for creating and updating z/VM APPLDATA
419 monitor records. The monitor records are updated at certain time
420 intervals, once the timer is started.
421 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
422 i.e. enables or disables monitoring on the Linux side.
423 A custom interval value (in seconds) can be written to
424 /proc/appldata/interval.
425
426 Defaults are 60 seconds interval and timer off.
427 The /proc entries can also be read from, showing the current settings.
428
429config APPLDATA_MEM
430 tristate "Monitor memory management statistics"
Al Viro62fb2ba2006-12-13 00:34:59 -0800431 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 help
433 This provides memory management related data to the Linux - VM Monitor
434 Stream, like paging/swapping rate, memory utilisation, etc.
435 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
436 APPLDATA monitor record, i.e. enables or disables monitoring this record
437 on the z/VM side.
438
439 Default is disabled.
440 The /proc entry can also be read from, showing the current settings.
441
442 This can also be compiled as a module, which will be called
443 appldata_mem.o.
444
445config APPLDATA_OS
446 tristate "Monitor OS statistics"
447 depends on APPLDATA_BASE
448 help
449 This provides OS related data to the Linux - VM Monitor Stream, like
450 CPU utilisation, etc.
451 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
452 APPLDATA monitor record, i.e. enables or disables monitoring this record
453 on the z/VM side.
454
455 Default is disabled.
456 This can also be compiled as a module, which will be called
457 appldata_os.o.
458
459config APPLDATA_NET_SUM
460 tristate "Monitor overall network statistics"
461 depends on APPLDATA_BASE
462 help
463 This provides network related data to the Linux - VM Monitor Stream,
464 currently there is only a total sum of network I/O statistics, no
465 per-interface data.
466 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
467 APPLDATA monitor record, i.e. enables or disables monitoring this record
468 on the z/VM side.
469
470 Default is disabled.
471 This can also be compiled as a module, which will be called
472 appldata_net_sum.o.
473
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200474source kernel/Kconfig.hz
475
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476config NO_IDLE_HZ
477 bool "No HZ timer ticks in idle"
478 help
479 Switches the regular HZ timer off when the system is going idle.
480 This helps z/VM to detect that the Linux system is idle. VM can
481 then "swap-out" this guest which reduces memory usage. It also
482 reduces the overhead of idle systems.
483
484 The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer.
485 hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ
486 timer is active.
487
488config NO_IDLE_HZ_INIT
489 bool "HZ timer in idle off by default"
490 depends on NO_IDLE_HZ
491 help
492 The HZ timer is switched off in idle by default. That means the
493 HZ timer is already disabled at boot time.
494
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700495config S390_HYPFS_FS
496 bool "s390 hypervisor file system support"
497 select SYS_HYPERVISOR
498 default y
499 help
500 This is a virtual file system intended to provide accounting
501 information in an s390 hypervisor environment.
502
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700503config KEXEC
Heiko Carstens07d43ce2006-09-20 15:59:29 +0200504 bool "kexec system call"
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700505 help
506 kexec is a system call that implements the ability to shutdown your
507 current kernel, and to start another kernel. It is like a reboot
508 but is independent of hardware/microcode support.
509
Michael Holzheu411ed322007-04-27 16:01:49 +0200510config ZFCPDUMP
511 tristate "zfcpdump support"
512 select SMP
513 default n
514 help
515 Select this option if you want to build an zfcpdump enabled kernel.
516 Refer to "Documentation/s390/zfcpdump.txt" for more details on this.
517
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518endmenu
519
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700520source "net/Kconfig"
521
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522config PCMCIA
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200523 def_bool n
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200525config CCW
526 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200528source "drivers/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
530source "fs/Kconfig"
531
Mathieu Desnoyers09caded2007-10-18 23:41:05 -0700532source "kernel/Kconfig.instrumentation"
Michael Grundy4ba069b2006-09-20 15:58:39 +0200533
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534source "arch/s390/Kconfig.debug"
535
536source "security/Kconfig"
537
538source "crypto/Kconfig"
539
540source "lib/Kconfig"