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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 | ||
10 | config RWSEM_GENERIC_SPINLOCK | |
11 | bool | |
12 | ||
13 | config RWSEM_XCHGADD_ALGORITHM | |
14 | bool | |
15 | default y | |
16 | ||
7e33db4e AM |
17 | config GENERIC_HWEIGHT |
18 | bool | |
19 | default y | |
20 | ||
1da177e4 LT |
21 | config GENERIC_CALIBRATE_DELAY |
22 | bool | |
23 | default y | |
24 | ||
25 | config GENERIC_BUST_SPINLOCK | |
26 | bool | |
27 | ||
28 | mainmenu "Linux Kernel Configuration" | |
29 | ||
347a8dc3 | 30 | config S390 |
1da177e4 LT |
31 | bool |
32 | default y | |
33 | ||
1da177e4 LT |
34 | source "init/Kconfig" |
35 | ||
36 | menu "Base setup" | |
37 | ||
38 | comment "Processor type and features" | |
39 | ||
347a8dc3 | 40 | config 64BIT |
1da177e4 LT |
41 | 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 | ||
1da177e4 LT |
46 | config 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 | ||
64 | config 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 | ||
77 | config 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 | ||
4bbf39c2 IM |
87 | config DEFAULT_MIGRATION_COST |
88 | int | |
89 | default "1000000" | |
90 | ||
1da177e4 LT |
91 | config 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 | ||
347a8dc3 | 99 | config COMPAT |
1da177e4 | 100 | bool "Kernel support for 31 bit emulation" |
347a8dc3 | 101 | depends on 64BIT |
1da177e4 LT |
102 | 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 | ||
1da177e4 LT |
108 | config SYSVIPC_COMPAT |
109 | bool | |
110 | depends on COMPAT && SYSVIPC | |
111 | default y | |
112 | ||
113 | config BINFMT_ELF32 | |
114 | tristate "Kernel support for 31 bit ELF binaries" | |
347a8dc3 | 115 | depends on COMPAT |
1da177e4 LT |
116 | 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 | ||
120 | comment "Code generation options" | |
121 | ||
122 | choice | |
123 | prompt "Processor type" | |
124 | default MARCH_G5 | |
125 | ||
126 | config MARCH_G5 | |
127 | bool "S/390 model G5 and G6" | |
347a8dc3 | 128 | depends on !64BIT |
1da177e4 LT |
129 | help |
130 | Select this to build a 31 bit kernel that works | |
131 | on all S/390 and zSeries machines. | |
132 | ||
133 | config 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 | ||
140 | config 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 | ||
147 | endchoice | |
148 | ||
149 | config 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 | ||
162 | config 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 | ||
176 | config 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 | ||
186 | config 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 | ||
200 | config 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 | ||
210 | config 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 | ||
3f22ab27 DH |
219 | source "mm/Kconfig" |
220 | ||
1da177e4 LT |
221 | comment "I/O subsystem configuration" |
222 | ||
223 | config 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 | ||
230 | config QDIO | |
231 | tristate "QDIO support" | |
232 | ---help--- | |
8129ee16 FP |
233 | This driver provides the Queued Direct I/O base support for |
234 | IBM mainframes. | |
1da177e4 LT |
235 | |
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 | ||
244 | config 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 | ||
252 | config QDIO_DEBUG | |
253 | bool "Extended debugging information" | |
254 | depends on QDIO | |
255 | help | |
8129ee16 FP |
256 | Say Y here to get extended debugging output in |
257 | /sys/kernel/debug/s390dbf/qdio... | |
1da177e4 LT |
258 | Warning: this option reduces the performance of the QDIO module. |
259 | ||
260 | If unsure, say N. | |
261 | ||
262 | comment "Misc" | |
263 | ||
264 | config 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 | ||
275 | config 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 | ||
283 | choice | |
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 | ||
293 | config IPL_TAPE | |
294 | bool "tape" | |
295 | ||
296 | config IPL_VM | |
297 | bool "vm_reader" | |
298 | ||
299 | endchoice | |
300 | ||
301 | source "fs/Kconfig.binfmt" | |
302 | ||
303 | config 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 | ||
310 | config 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 | ||
322 | config 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 | ||
331 | config 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 | ||
343 | config 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 | ||
350 | config 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 | ||
357 | config 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 | ||
363 | config 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 | ||
370 | config 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 | ||
385 | config 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 | ||
401 | config 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 | ||
415 | config 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 | ||
430 | config 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 | ||
442 | config 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 | ||
cf13f0ea HC |
449 | config 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 | ||
1da177e4 LT |
457 | endmenu |
458 | ||
d5950b43 SR |
459 | source "net/Kconfig" |
460 | ||
1da177e4 LT |
461 | config PCMCIA |
462 | bool | |
463 | default n | |
464 | ||
465 | source "drivers/base/Kconfig" | |
466 | ||
61d3ad0e MS |
467 | source "drivers/connector/Kconfig" |
468 | ||
1da177e4 LT |
469 | source "drivers/scsi/Kconfig" |
470 | ||
471 | source "drivers/s390/Kconfig" | |
472 | ||
d5950b43 | 473 | source "drivers/net/Kconfig" |
1da177e4 LT |
474 | |
475 | source "fs/Kconfig" | |
476 | ||
477 | source "arch/s390/oprofile/Kconfig" | |
478 | ||
479 | source "arch/s390/Kconfig.debug" | |
480 | ||
481 | source "security/Kconfig" | |
482 | ||
483 | source "crypto/Kconfig" | |
484 | ||
485 | source "lib/Kconfig" |