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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
7 bool
8 default y
9
10config RWSEM_GENERIC_SPINLOCK
11 bool
12
13config RWSEM_XCHGADD_ALGORITHM
14 bool
15 default y
16
Akinobu Mita7e33db42006-03-26 01:39:34 -080017config GENERIC_HWEIGHT
18 bool
19 default y
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021config GENERIC_CALIBRATE_DELAY
22 bool
23 default y
24
25config GENERIC_BUST_SPINLOCK
26 bool
27
28mainmenu "Linux Kernel Configuration"
29
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080030config S390
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 bool
32 default y
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034source "init/Kconfig"
35
36menu "Base setup"
37
38comment "Processor type and features"
39
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080040config 64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 bool "64 bit kernel"
42 help
43 Select this option if you have a 64 bit IBM zSeries machine
44 and want to use the 64 bit addressing mode.
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046config SMP
47 bool "Symmetric multi-processing support"
48 ---help---
49 This enables support for systems with more than one CPU. If you have
50 a system with only one CPU, like most personal computers, say N. If
51 you have a system with more than one CPU, say Y.
52
53 If you say N here, the kernel will run on single and multiprocessor
54 machines, but will use only one CPU of a multiprocessor machine. If
55 you say Y here, the kernel will run on many, but not all,
56 singleprocessor machines. On a singleprocessor machine, the kernel
57 will run faster if you say N here.
58
59 See also the <file:Documentation/smp.txt> and the SMP-HOWTO
60 available at <http://www.tldp.org/docs.html#howto>.
61
62 Even if you don't know what to do here, say Y.
63
64config NR_CPUS
65 int "Maximum number of CPUs (2-64)"
66 range 2 64
67 depends on SMP
68 default "32"
69 help
70 This allows you to specify the maximum number of CPUs which this
71 kernel will support. The maximum supported value is 64 and the
72 minimum value which makes sense is 2.
73
74 This is purely to save memory - each supported CPU adds
75 approximately sixteen kilobytes to the kernel image.
76
77config HOTPLUG_CPU
78 bool "Support for hot-pluggable CPUs"
79 depends on SMP
80 select HOTPLUG
81 default n
82 help
83 Say Y here to be able to turn CPUs off and on. CPUs
84 can be controlled through /sys/devices/system/cpu/cpu#.
85 Say N if you want to disable CPU hotplug.
86
Ingo Molnar4bbf39c2006-02-17 13:52:44 -080087config DEFAULT_MIGRATION_COST
88 int
89 default "1000000"
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091config MATHEMU
92 bool "IEEE FPU emulation"
93 depends on MARCH_G5
94 help
95 This option is required for IEEE compliant floating point arithmetic
96 on older S/390 machines. Say Y unless you know your machine doesn't
97 need this.
98
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080099config COMPAT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 bool "Kernel support for 31 bit emulation"
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800101 depends on 64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 help
103 Select this option if you want to enable your system kernel to
104 handle system-calls from ELF binaries for 31 bit ESA. This option
105 (and some other stuff like libraries and such) is needed for
106 executing 31 bit applications. It is safe to say "Y".
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108config SYSVIPC_COMPAT
109 bool
110 depends on COMPAT && SYSVIPC
111 default y
112
113config BINFMT_ELF32
114 tristate "Kernel support for 31 bit ELF binaries"
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800115 depends on COMPAT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 help
117 This allows you to run 32-bit Linux/ELF binaries on your zSeries
118 in 64 bit mode. Everybody wants this; say Y.
119
120comment "Code generation options"
121
122choice
123 prompt "Processor type"
124 default MARCH_G5
125
126config MARCH_G5
127 bool "S/390 model G5 and G6"
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800128 depends on !64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 help
130 Select this to build a 31 bit kernel that works
131 on all S/390 and zSeries machines.
132
133config MARCH_Z900
134 bool "IBM eServer zSeries model z800 and z900"
135 help
136 Select this to optimize for zSeries machines. This
137 will enable some optimizations that are not available
138 on older 31 bit only CPUs.
139
140config MARCH_Z990
141 bool "IBM eServer zSeries model z890 and z990"
142 help
143 Select this enable optimizations for model z890/z990.
144 This will be slightly faster but does not work on
145 older machines such as the z900.
146
147endchoice
148
149config PACK_STACK
150 bool "Pack kernel stack"
151 help
152 This option enables the compiler option -mkernel-backchain if it
153 is available. If the option is available the compiler supports
154 the new stack layout which dramatically reduces the minimum stack
155 frame size. With an old compiler a non-leaf function needs a
156 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
157 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
158 and 24 byte on 64 bit.
159
160 Say Y if you are unsure.
161
162config SMALL_STACK
163 bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb"
164 depends on PACK_STACK
165 help
166 If you say Y here and the compiler supports the -mkernel-backchain
167 option the kernel will use a smaller kernel stack size. For 31 bit
168 the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb
169 instead of 16kb. This allows to run more thread on a system and
170 reduces the pressure on the memory management for higher order
171 page allocations.
172
173 Say N if you are unsure.
174
175
176config CHECK_STACK
177 bool "Detect kernel stack overflow"
178 help
179 This option enables the compiler option -mstack-guard and
180 -mstack-size if they are available. If the compiler supports them
181 it will emit additional code to each function prolog to trigger
182 an illegal operation if the kernel stack is about to overflow.
183
184 Say N if you are unsure.
185
186config STACK_GUARD
187 int "Size of the guard area (128-1024)"
188 range 128 1024
189 depends on CHECK_STACK
190 default "256"
191 help
192 This allows you to specify the size of the guard area at the lower
193 end of the kernel stack. If the kernel stack points into the guard
194 area on function entry an illegal operation is triggered. The size
195 needs to be a power of 2. Please keep in mind that the size of an
196 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
197 The minimum size for the stack guard should be 256 for 31 bit and
198 512 for 64 bit.
199
200config WARN_STACK
201 bool "Emit compiler warnings for function with broken stack usage"
202 help
203 This option enables the compiler options -mwarn-framesize and
204 -mwarn-dynamicstack. If the compiler supports these options it
205 will generate warnings for function which either use alloca or
206 create a stack frame bigger then CONFIG_WARN_STACK_SIZE.
207
208 Say N if you are unsure.
209
210config WARN_STACK_SIZE
211 int "Maximum frame size considered safe (128-2048)"
212 range 128 2048
213 depends on WARN_STACK
214 default "256"
215 help
216 This allows you to specify the maximum frame size a function may
217 have without the compiler complaining about it.
218
Dave Hansen3f22ab22005-06-23 00:07:43 -0700219source "mm/Kconfig"
220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221comment "I/O subsystem configuration"
222
223config MACHCHK_WARNING
224 bool "Process warning machine checks"
225 help
226 Select this option if you want the machine check handler on IBM S/390 or
227 zSeries to process warning machine checks (e.g. on power failures).
228 If unsure, say "Y".
229
230config QDIO
231 tristate "QDIO support"
232 ---help---
Frank Pavlic8129ee12006-01-06 00:19:20 -0800233 This driver provides the Queued Direct I/O base support for
234 IBM mainframes.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
236 For details please refer to the documentation provided by IBM at
237 <http://www10.software.ibm.com/developerworks/opensource/linux390>
238
239 To compile this driver as a module, choose M here: the
240 module will be called qdio.
241
242 If unsure, say Y.
243
244config QDIO_PERF_STATS
245 bool "Performance statistics in /proc"
246 depends on QDIO
247 help
248 Say Y here to get performance statistics in /proc/qdio_perf
249
250 If unsure, say N.
251
252config QDIO_DEBUG
253 bool "Extended debugging information"
254 depends on QDIO
255 help
Frank Pavlic8129ee12006-01-06 00:19:20 -0800256 Say Y here to get extended debugging output in
257 /sys/kernel/debug/s390dbf/qdio...
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 Warning: this option reduces the performance of the QDIO module.
259
260 If unsure, say N.
261
262comment "Misc"
263
264config PREEMPT
265 bool "Preemptible Kernel"
266 help
267 This option reduces the latency of the kernel when reacting to
268 real-time or interactive events by allowing a low priority process to
269 be preempted even if it is in kernel mode executing a system call.
270 This allows applications to run more reliably even when the system is
271 under load.
272
273 Say N if you are unsure.
274
275config IPL
276 bool "Builtin IPL record support"
277 help
278 If you want to use the produced kernel to IPL directly from a
279 device, you have to merge a bootsector specific to the device
280 into the first bytes of the kernel. You will have to select the
281 IPL device.
282
283choice
284 prompt "IPL method generated into head.S"
285 depends on IPL
286 default IPL_TAPE
287 help
288 Select "tape" if you want to IPL the image from a Tape.
289
290 Select "vm_reader" if you are running under VM/ESA and want
291 to IPL the image from the emulated card reader.
292
293config IPL_TAPE
294 bool "tape"
295
296config IPL_VM
297 bool "vm_reader"
298
299endchoice
300
301source "fs/Kconfig.binfmt"
302
303config PROCESS_DEBUG
304 bool "Show crashed user process info"
305 help
306 Say Y to print all process fault locations to the console. This is
307 a debugging option; you probably do not want to set it unless you
308 are an S390 port maintainer.
309
310config PFAULT
311 bool "Pseudo page fault support"
312 help
313 Select this option, if you want to use PFAULT pseudo page fault
314 handling under VM. If running native or in LPAR, this option
315 has no effect. If your VM does not support PFAULT, PAGEEX
316 pseudo page fault handling will be used.
317 Note that VM 4.2 supports PFAULT but has a bug in its
318 implementation that causes some problems.
319 Everybody who wants to run Linux under VM != VM4.2 should select
320 this option.
321
322config SHARED_KERNEL
323 bool "VM shared kernel support"
324 help
325 Select this option, if you want to share the text segment of the
326 Linux kernel between different VM guests. This reduces memory
327 usage with lots of guests but greatly increases kernel size.
328 You should only select this option if you know what you are
329 doing and want to exploit this feature.
330
331config CMM
332 tristate "Cooperative memory management"
333 help
334 Select this option, if you want to enable the kernel interface
335 to reduce the memory size of the system. This is accomplished
336 by allocating pages of memory and put them "on hold". This only
337 makes sense for a system running under VM where the unused pages
338 will be reused by VM for other guest systems. The interface
339 allows an external monitor to balance memory of many systems.
340 Everybody who wants to run Linux under VM should select this
341 option.
342
343config CMM_PROC
344 bool "/proc interface to cooperative memory management"
345 depends on CMM
346 help
347 Select this option to enable the /proc interface to the
348 cooperative memory management.
349
350config CMM_IUCV
351 bool "IUCV special message interface to cooperative memory management"
352 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
353 help
354 Select this option to enable the special message interface to
355 the cooperative memory management.
356
357config VIRT_TIMER
358 bool "Virtual CPU timer support"
359 help
360 This provides a kernel interface for virtual CPU timers.
361 Default is disabled.
362
363config VIRT_CPU_ACCOUNTING
364 bool "Base user process accounting on virtual cpu timer"
365 depends on VIRT_TIMER
366 help
367 Select this option to use CPU timer deltas to do user
368 process accounting.
369
370config APPLDATA_BASE
371 bool "Linux - VM Monitor Stream, base infrastructure"
372 depends on PROC_FS && VIRT_TIMER=y
373 help
374 This provides a kernel interface for creating and updating z/VM APPLDATA
375 monitor records. The monitor records are updated at certain time
376 intervals, once the timer is started.
377 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
378 i.e. enables or disables monitoring on the Linux side.
379 A custom interval value (in seconds) can be written to
380 /proc/appldata/interval.
381
382 Defaults are 60 seconds interval and timer off.
383 The /proc entries can also be read from, showing the current settings.
384
385config APPLDATA_MEM
386 tristate "Monitor memory management statistics"
387 depends on APPLDATA_BASE
388 help
389 This provides memory management related data to the Linux - VM Monitor
390 Stream, like paging/swapping rate, memory utilisation, etc.
391 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
392 APPLDATA monitor record, i.e. enables or disables monitoring this record
393 on the z/VM side.
394
395 Default is disabled.
396 The /proc entry can also be read from, showing the current settings.
397
398 This can also be compiled as a module, which will be called
399 appldata_mem.o.
400
401config APPLDATA_OS
402 tristate "Monitor OS statistics"
403 depends on APPLDATA_BASE
404 help
405 This provides OS related data to the Linux - VM Monitor Stream, like
406 CPU utilisation, etc.
407 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
408 APPLDATA monitor record, i.e. enables or disables monitoring this record
409 on the z/VM side.
410
411 Default is disabled.
412 This can also be compiled as a module, which will be called
413 appldata_os.o.
414
415config APPLDATA_NET_SUM
416 tristate "Monitor overall network statistics"
417 depends on APPLDATA_BASE
418 help
419 This provides network related data to the Linux - VM Monitor Stream,
420 currently there is only a total sum of network I/O statistics, no
421 per-interface data.
422 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
423 APPLDATA monitor record, i.e. enables or disables monitoring this record
424 on the z/VM side.
425
426 Default is disabled.
427 This can also be compiled as a module, which will be called
428 appldata_net_sum.o.
429
430config NO_IDLE_HZ
431 bool "No HZ timer ticks in idle"
432 help
433 Switches the regular HZ timer off when the system is going idle.
434 This helps z/VM to detect that the Linux system is idle. VM can
435 then "swap-out" this guest which reduces memory usage. It also
436 reduces the overhead of idle systems.
437
438 The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer.
439 hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ
440 timer is active.
441
442config NO_IDLE_HZ_INIT
443 bool "HZ timer in idle off by default"
444 depends on NO_IDLE_HZ
445 help
446 The HZ timer is switched off in idle by default. That means the
447 HZ timer is already disabled at boot time.
448
Heiko Carstenscf13f0e2005-06-25 14:58:11 -0700449config KEXEC
450 bool "kexec system call (EXPERIMENTAL)"
451 depends on EXPERIMENTAL
452 help
453 kexec is a system call that implements the ability to shutdown your
454 current kernel, and to start another kernel. It is like a reboot
455 but is independent of hardware/microcode support.
456
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457endmenu
458
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700459source "net/Kconfig"
460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461config PCMCIA
462 bool
463 default n
464
465source "drivers/base/Kconfig"
466
Martin Schwidefsky61d3ad02006-03-24 03:15:18 -0800467source "drivers/connector/Kconfig"
468
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469source "drivers/scsi/Kconfig"
470
471source "drivers/s390/Kconfig"
472
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700473source "drivers/net/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475source "fs/Kconfig"
476
477source "arch/s390/oprofile/Kconfig"
478
479source "arch/s390/Kconfig.debug"
480
481source "security/Kconfig"
482
483source "crypto/Kconfig"
484
485source "lib/Kconfig"