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1da177e4 LT |
1 | # |
2 | # For a description of the syntax of this configuration file, | |
3 | # see Documentation/kbuild/kconfig-language.txt. | |
4 | # | |
5 | ||
6 | config MMU | |
7 | bool | |
8 | default y | |
9 | ||
2b105ff9 IM |
10 | config LOCKDEP_SUPPORT |
11 | bool | |
12 | default y | |
13 | ||
5bdc9b44 HC |
14 | config STACKTRACE_SUPPORT |
15 | bool | |
16 | default y | |
17 | ||
1da177e4 LT |
18 | config RWSEM_GENERIC_SPINLOCK |
19 | bool | |
20 | ||
21 | config RWSEM_XCHGADD_ALGORITHM | |
22 | bool | |
23 | default y | |
24 | ||
7e33db4e AM |
25 | config GENERIC_HWEIGHT |
26 | bool | |
27 | default y | |
28 | ||
1da177e4 LT |
29 | config GENERIC_CALIBRATE_DELAY |
30 | bool | |
31 | default y | |
32 | ||
dc64bef5 MS |
33 | config GENERIC_TIME |
34 | def_bool y | |
35 | ||
1da177e4 LT |
36 | mainmenu "Linux Kernel Configuration" |
37 | ||
347a8dc3 | 38 | config S390 |
1da177e4 LT |
39 | bool |
40 | default y | |
41 | ||
1da177e4 LT |
42 | source "init/Kconfig" |
43 | ||
44 | menu "Base setup" | |
45 | ||
46 | comment "Processor type and features" | |
47 | ||
347a8dc3 | 48 | config 64BIT |
1da177e4 LT |
49 | bool "64 bit kernel" |
50 | help | |
51 | Select this option if you have a 64 bit IBM zSeries machine | |
52 | and want to use the 64 bit addressing mode. | |
53 | ||
d9f7a745 MS |
54 | config 32BIT |
55 | bool | |
56 | default y if !64BIT | |
57 | ||
1da177e4 LT |
58 | config SMP |
59 | bool "Symmetric multi-processing support" | |
60 | ---help--- | |
61 | This enables support for systems with more than one CPU. If you have | |
62 | a system with only one CPU, like most personal computers, say N. If | |
63 | you have a system with more than one CPU, say Y. | |
64 | ||
65 | If you say N here, the kernel will run on single and multiprocessor | |
66 | machines, but will use only one CPU of a multiprocessor machine. If | |
67 | you say Y here, the kernel will run on many, but not all, | |
68 | singleprocessor machines. On a singleprocessor machine, the kernel | |
69 | will run faster if you say N here. | |
70 | ||
71 | See also the <file:Documentation/smp.txt> and the SMP-HOWTO | |
72 | available at <http://www.tldp.org/docs.html#howto>. | |
73 | ||
74 | Even if you don't know what to do here, say Y. | |
75 | ||
76 | config NR_CPUS | |
77 | int "Maximum number of CPUs (2-64)" | |
78 | range 2 64 | |
79 | depends on SMP | |
80 | default "32" | |
81 | help | |
82 | This allows you to specify the maximum number of CPUs which this | |
83 | kernel will support. The maximum supported value is 64 and the | |
84 | minimum value which makes sense is 2. | |
85 | ||
86 | This is purely to save memory - each supported CPU adds | |
87 | approximately sixteen kilobytes to the kernel image. | |
88 | ||
89 | config HOTPLUG_CPU | |
90 | bool "Support for hot-pluggable CPUs" | |
91 | depends on SMP | |
92 | select HOTPLUG | |
93 | default n | |
94 | help | |
95 | Say Y here to be able to turn CPUs off and on. CPUs | |
96 | can be controlled through /sys/devices/system/cpu/cpu#. | |
97 | Say N if you want to disable CPU hotplug. | |
98 | ||
4bbf39c2 IM |
99 | config DEFAULT_MIGRATION_COST |
100 | int | |
101 | default "1000000" | |
102 | ||
1da177e4 LT |
103 | config MATHEMU |
104 | bool "IEEE FPU emulation" | |
105 | depends on MARCH_G5 | |
106 | help | |
107 | This option is required for IEEE compliant floating point arithmetic | |
108 | on older S/390 machines. Say Y unless you know your machine doesn't | |
109 | need this. | |
110 | ||
347a8dc3 | 111 | config COMPAT |
1da177e4 | 112 | bool "Kernel support for 31 bit emulation" |
347a8dc3 | 113 | depends on 64BIT |
1da177e4 LT |
114 | help |
115 | Select this option if you want to enable your system kernel to | |
116 | handle system-calls from ELF binaries for 31 bit ESA. This option | |
117 | (and some other stuff like libraries and such) is needed for | |
118 | executing 31 bit applications. It is safe to say "Y". | |
119 | ||
1da177e4 LT |
120 | config SYSVIPC_COMPAT |
121 | bool | |
122 | depends on COMPAT && SYSVIPC | |
123 | default y | |
124 | ||
e65e1fc2 AV |
125 | config AUDIT_ARCH |
126 | bool | |
127 | default y | |
128 | ||
1da177e4 LT |
129 | comment "Code generation options" |
130 | ||
131 | choice | |
132 | prompt "Processor type" | |
133 | default MARCH_G5 | |
134 | ||
135 | config MARCH_G5 | |
136 | bool "S/390 model G5 and G6" | |
347a8dc3 | 137 | depends on !64BIT |
1da177e4 LT |
138 | help |
139 | Select this to build a 31 bit kernel that works | |
140 | on all S/390 and zSeries machines. | |
141 | ||
142 | config MARCH_Z900 | |
143 | bool "IBM eServer zSeries model z800 and z900" | |
144 | help | |
145 | Select this to optimize for zSeries machines. This | |
146 | will enable some optimizations that are not available | |
147 | on older 31 bit only CPUs. | |
148 | ||
149 | config MARCH_Z990 | |
150 | bool "IBM eServer zSeries model z890 and z990" | |
151 | help | |
152 | Select this enable optimizations for model z890/z990. | |
153 | This will be slightly faster but does not work on | |
154 | older machines such as the z900. | |
155 | ||
0efa4703 CB |
156 | config MARCH_Z9_109 |
157 | bool "IBM System z9" | |
158 | help | |
159 | Select this to enable optimizations for IBM System z9-109, IBM | |
160 | System z9 Enterprise Class (z9 EC), and IBM System z9 Business | |
161 | Class (z9 BC). The kernel will be slightly faster but will not | |
162 | work on older machines such as the z990, z890, z900, and z800. | |
163 | ||
1da177e4 LT |
164 | endchoice |
165 | ||
166 | config PACK_STACK | |
167 | bool "Pack kernel stack" | |
168 | help | |
169 | This option enables the compiler option -mkernel-backchain if it | |
170 | is available. If the option is available the compiler supports | |
171 | the new stack layout which dramatically reduces the minimum stack | |
172 | frame size. With an old compiler a non-leaf function needs a | |
173 | minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With | |
174 | -mkernel-backchain the minimum size drops to 16 byte on 31 bit | |
175 | and 24 byte on 64 bit. | |
176 | ||
177 | Say Y if you are unsure. | |
178 | ||
179 | config SMALL_STACK | |
180 | bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb" | |
181 | depends on PACK_STACK | |
182 | help | |
183 | If you say Y here and the compiler supports the -mkernel-backchain | |
184 | option the kernel will use a smaller kernel stack size. For 31 bit | |
185 | the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb | |
186 | instead of 16kb. This allows to run more thread on a system and | |
187 | reduces the pressure on the memory management for higher order | |
188 | page allocations. | |
189 | ||
190 | Say N if you are unsure. | |
191 | ||
192 | ||
193 | config CHECK_STACK | |
194 | bool "Detect kernel stack overflow" | |
195 | help | |
196 | This option enables the compiler option -mstack-guard and | |
197 | -mstack-size if they are available. If the compiler supports them | |
198 | it will emit additional code to each function prolog to trigger | |
199 | an illegal operation if the kernel stack is about to overflow. | |
200 | ||
201 | Say N if you are unsure. | |
202 | ||
203 | config STACK_GUARD | |
204 | int "Size of the guard area (128-1024)" | |
205 | range 128 1024 | |
206 | depends on CHECK_STACK | |
207 | default "256" | |
208 | help | |
209 | This allows you to specify the size of the guard area at the lower | |
210 | end of the kernel stack. If the kernel stack points into the guard | |
211 | area on function entry an illegal operation is triggered. The size | |
212 | needs to be a power of 2. Please keep in mind that the size of an | |
213 | interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. | |
214 | The minimum size for the stack guard should be 256 for 31 bit and | |
215 | 512 for 64 bit. | |
216 | ||
217 | config WARN_STACK | |
218 | bool "Emit compiler warnings for function with broken stack usage" | |
219 | help | |
220 | This option enables the compiler options -mwarn-framesize and | |
221 | -mwarn-dynamicstack. If the compiler supports these options it | |
222 | will generate warnings for function which either use alloca or | |
223 | create a stack frame bigger then CONFIG_WARN_STACK_SIZE. | |
224 | ||
225 | Say N if you are unsure. | |
226 | ||
227 | config WARN_STACK_SIZE | |
228 | int "Maximum frame size considered safe (128-2048)" | |
229 | range 128 2048 | |
230 | depends on WARN_STACK | |
231 | default "256" | |
232 | help | |
233 | This allows you to specify the maximum frame size a function may | |
234 | have without the compiler complaining about it. | |
235 | ||
3f22ab27 DH |
236 | source "mm/Kconfig" |
237 | ||
1da177e4 LT |
238 | comment "I/O subsystem configuration" |
239 | ||
240 | config MACHCHK_WARNING | |
241 | bool "Process warning machine checks" | |
242 | help | |
243 | Select this option if you want the machine check handler on IBM S/390 or | |
244 | zSeries to process warning machine checks (e.g. on power failures). | |
245 | If unsure, say "Y". | |
246 | ||
247 | config QDIO | |
248 | tristate "QDIO support" | |
249 | ---help--- | |
8129ee16 FP |
250 | This driver provides the Queued Direct I/O base support for |
251 | IBM mainframes. | |
1da177e4 LT |
252 | |
253 | For details please refer to the documentation provided by IBM at | |
254 | <http://www10.software.ibm.com/developerworks/opensource/linux390> | |
255 | ||
256 | To compile this driver as a module, choose M here: the | |
257 | module will be called qdio. | |
258 | ||
259 | If unsure, say Y. | |
260 | ||
261 | config QDIO_PERF_STATS | |
262 | bool "Performance statistics in /proc" | |
263 | depends on QDIO | |
264 | help | |
265 | Say Y here to get performance statistics in /proc/qdio_perf | |
266 | ||
267 | If unsure, say N. | |
268 | ||
269 | config QDIO_DEBUG | |
270 | bool "Extended debugging information" | |
271 | depends on QDIO | |
272 | help | |
8129ee16 FP |
273 | Say Y here to get extended debugging output in |
274 | /sys/kernel/debug/s390dbf/qdio... | |
1da177e4 LT |
275 | Warning: this option reduces the performance of the QDIO module. |
276 | ||
277 | If unsure, say N. | |
278 | ||
279 | comment "Misc" | |
280 | ||
281 | config PREEMPT | |
282 | bool "Preemptible Kernel" | |
283 | help | |
284 | This option reduces the latency of the kernel when reacting to | |
285 | real-time or interactive events by allowing a low priority process to | |
286 | be preempted even if it is in kernel mode executing a system call. | |
287 | This allows applications to run more reliably even when the system is | |
288 | under load. | |
289 | ||
290 | Say N if you are unsure. | |
291 | ||
292 | config IPL | |
293 | bool "Builtin IPL record support" | |
294 | help | |
295 | If you want to use the produced kernel to IPL directly from a | |
296 | device, you have to merge a bootsector specific to the device | |
297 | into the first bytes of the kernel. You will have to select the | |
298 | IPL device. | |
299 | ||
300 | choice | |
301 | prompt "IPL method generated into head.S" | |
302 | depends on IPL | |
303 | default IPL_TAPE | |
304 | help | |
305 | Select "tape" if you want to IPL the image from a Tape. | |
306 | ||
307 | Select "vm_reader" if you are running under VM/ESA and want | |
308 | to IPL the image from the emulated card reader. | |
309 | ||
310 | config IPL_TAPE | |
311 | bool "tape" | |
312 | ||
313 | config IPL_VM | |
314 | bool "vm_reader" | |
315 | ||
316 | endchoice | |
317 | ||
318 | source "fs/Kconfig.binfmt" | |
319 | ||
320 | config PROCESS_DEBUG | |
321 | bool "Show crashed user process info" | |
322 | help | |
323 | Say Y to print all process fault locations to the console. This is | |
324 | a debugging option; you probably do not want to set it unless you | |
325 | are an S390 port maintainer. | |
326 | ||
327 | config PFAULT | |
328 | bool "Pseudo page fault support" | |
329 | help | |
330 | Select this option, if you want to use PFAULT pseudo page fault | |
331 | handling under VM. If running native or in LPAR, this option | |
332 | has no effect. If your VM does not support PFAULT, PAGEEX | |
333 | pseudo page fault handling will be used. | |
334 | Note that VM 4.2 supports PFAULT but has a bug in its | |
335 | implementation that causes some problems. | |
336 | Everybody who wants to run Linux under VM != VM4.2 should select | |
337 | this option. | |
338 | ||
339 | config SHARED_KERNEL | |
340 | bool "VM shared kernel support" | |
341 | help | |
342 | Select this option, if you want to share the text segment of the | |
343 | Linux kernel between different VM guests. This reduces memory | |
344 | usage with lots of guests but greatly increases kernel size. | |
345 | You should only select this option if you know what you are | |
346 | doing and want to exploit this feature. | |
347 | ||
348 | config CMM | |
349 | tristate "Cooperative memory management" | |
350 | help | |
351 | Select this option, if you want to enable the kernel interface | |
352 | to reduce the memory size of the system. This is accomplished | |
353 | by allocating pages of memory and put them "on hold". This only | |
354 | makes sense for a system running under VM where the unused pages | |
355 | will be reused by VM for other guest systems. The interface | |
356 | allows an external monitor to balance memory of many systems. | |
357 | Everybody who wants to run Linux under VM should select this | |
358 | option. | |
359 | ||
360 | config CMM_PROC | |
361 | bool "/proc interface to cooperative memory management" | |
362 | depends on CMM | |
363 | help | |
364 | Select this option to enable the /proc interface to the | |
365 | cooperative memory management. | |
366 | ||
367 | config CMM_IUCV | |
368 | bool "IUCV special message interface to cooperative memory management" | |
369 | depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) | |
370 | help | |
371 | Select this option to enable the special message interface to | |
372 | the cooperative memory management. | |
373 | ||
374 | config VIRT_TIMER | |
375 | bool "Virtual CPU timer support" | |
376 | help | |
377 | This provides a kernel interface for virtual CPU timers. | |
378 | Default is disabled. | |
379 | ||
380 | config VIRT_CPU_ACCOUNTING | |
381 | bool "Base user process accounting on virtual cpu timer" | |
382 | depends on VIRT_TIMER | |
383 | help | |
384 | Select this option to use CPU timer deltas to do user | |
385 | process accounting. | |
386 | ||
387 | config APPLDATA_BASE | |
388 | bool "Linux - VM Monitor Stream, base infrastructure" | |
389 | depends on PROC_FS && VIRT_TIMER=y | |
390 | help | |
391 | This provides a kernel interface for creating and updating z/VM APPLDATA | |
392 | monitor records. The monitor records are updated at certain time | |
393 | intervals, once the timer is started. | |
394 | Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, | |
395 | i.e. enables or disables monitoring on the Linux side. | |
396 | A custom interval value (in seconds) can be written to | |
397 | /proc/appldata/interval. | |
398 | ||
399 | Defaults are 60 seconds interval and timer off. | |
400 | The /proc entries can also be read from, showing the current settings. | |
401 | ||
402 | config APPLDATA_MEM | |
403 | tristate "Monitor memory management statistics" | |
404 | depends on APPLDATA_BASE | |
405 | help | |
406 | This provides memory management related data to the Linux - VM Monitor | |
407 | Stream, like paging/swapping rate, memory utilisation, etc. | |
408 | Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM | |
409 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
410 | on the z/VM side. | |
411 | ||
412 | Default is disabled. | |
413 | The /proc entry can also be read from, showing the current settings. | |
414 | ||
415 | This can also be compiled as a module, which will be called | |
416 | appldata_mem.o. | |
417 | ||
418 | config APPLDATA_OS | |
419 | tristate "Monitor OS statistics" | |
420 | depends on APPLDATA_BASE | |
421 | help | |
422 | This provides OS related data to the Linux - VM Monitor Stream, like | |
423 | CPU utilisation, etc. | |
424 | Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM | |
425 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
426 | on the z/VM side. | |
427 | ||
428 | Default is disabled. | |
429 | This can also be compiled as a module, which will be called | |
430 | appldata_os.o. | |
431 | ||
432 | config APPLDATA_NET_SUM | |
433 | tristate "Monitor overall network statistics" | |
434 | depends on APPLDATA_BASE | |
435 | help | |
436 | This provides network related data to the Linux - VM Monitor Stream, | |
437 | currently there is only a total sum of network I/O statistics, no | |
438 | per-interface data. | |
439 | Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM | |
440 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
441 | on the z/VM side. | |
442 | ||
443 | Default is disabled. | |
444 | This can also be compiled as a module, which will be called | |
445 | appldata_net_sum.o. | |
446 | ||
447 | config NO_IDLE_HZ | |
448 | bool "No HZ timer ticks in idle" | |
449 | help | |
450 | Switches the regular HZ timer off when the system is going idle. | |
451 | This helps z/VM to detect that the Linux system is idle. VM can | |
452 | then "swap-out" this guest which reduces memory usage. It also | |
453 | reduces the overhead of idle systems. | |
454 | ||
455 | The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer. | |
456 | hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ | |
457 | timer is active. | |
458 | ||
459 | config NO_IDLE_HZ_INIT | |
460 | bool "HZ timer in idle off by default" | |
461 | depends on NO_IDLE_HZ | |
462 | help | |
463 | The HZ timer is switched off in idle by default. That means the | |
464 | HZ timer is already disabled at boot time. | |
465 | ||
24bbb1fa MH |
466 | config S390_HYPFS_FS |
467 | bool "s390 hypervisor file system support" | |
468 | select SYS_HYPERVISOR | |
469 | default y | |
470 | help | |
471 | This is a virtual file system intended to provide accounting | |
472 | information in an s390 hypervisor environment. | |
473 | ||
cf13f0ea | 474 | config KEXEC |
07d43ce6 | 475 | bool "kexec system call" |
cf13f0ea HC |
476 | help |
477 | kexec is a system call that implements the ability to shutdown your | |
478 | current kernel, and to start another kernel. It is like a reboot | |
479 | but is independent of hardware/microcode support. | |
480 | ||
1da177e4 LT |
481 | endmenu |
482 | ||
d5950b43 SR |
483 | source "net/Kconfig" |
484 | ||
1da177e4 LT |
485 | config PCMCIA |
486 | bool | |
487 | default n | |
488 | ||
489 | source "drivers/base/Kconfig" | |
490 | ||
61d3ad0e MS |
491 | source "drivers/connector/Kconfig" |
492 | ||
1da177e4 LT |
493 | source "drivers/scsi/Kconfig" |
494 | ||
495 | source "drivers/s390/Kconfig" | |
496 | ||
d5950b43 | 497 | source "drivers/net/Kconfig" |
1da177e4 LT |
498 | |
499 | source "fs/Kconfig" | |
500 | ||
4ba069b8 MG |
501 | menu "Instrumentation Support" |
502 | ||
1da177e4 LT |
503 | source "arch/s390/oprofile/Kconfig" |
504 | ||
4ba069b8 MG |
505 | config KPROBES |
506 | bool "Kprobes (EXPERIMENTAL)" | |
507 | depends on EXPERIMENTAL && MODULES | |
508 | help | |
509 | Kprobes allows you to trap at almost any kernel address and | |
510 | execute a callback function. register_kprobe() establishes | |
511 | a probepoint and specifies the callback. Kprobes is useful | |
512 | for kernel debugging, non-intrusive instrumentation and testing. | |
513 | If in doubt, say "N". | |
514 | ||
515 | endmenu | |
516 | ||
1da177e4 LT |
517 | source "arch/s390/Kconfig.debug" |
518 | ||
519 | source "security/Kconfig" | |
520 | ||
521 | source "crypto/Kconfig" | |
522 | ||
523 | source "lib/Kconfig" |