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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 | ||
17 | config GENERIC_CALIBRATE_DELAY | |
18 | bool | |
19 | default y | |
20 | ||
21 | config GENERIC_BUST_SPINLOCK | |
22 | bool | |
23 | ||
24 | mainmenu "Linux Kernel Configuration" | |
25 | ||
347a8dc3 | 26 | config S390 |
1da177e4 LT |
27 | bool |
28 | default y | |
29 | ||
1da177e4 LT |
30 | source "init/Kconfig" |
31 | ||
32 | menu "Base setup" | |
33 | ||
34 | comment "Processor type and features" | |
35 | ||
347a8dc3 | 36 | config 64BIT |
1da177e4 LT |
37 | bool "64 bit kernel" |
38 | help | |
39 | Select this option if you have a 64 bit IBM zSeries machine | |
40 | and want to use the 64 bit addressing mode. | |
41 | ||
1da177e4 LT |
42 | config SMP |
43 | bool "Symmetric multi-processing support" | |
44 | ---help--- | |
45 | This enables support for systems with more than one CPU. If you have | |
46 | a system with only one CPU, like most personal computers, say N. If | |
47 | you have a system with more than one CPU, say Y. | |
48 | ||
49 | If you say N here, the kernel will run on single and multiprocessor | |
50 | machines, but will use only one CPU of a multiprocessor machine. If | |
51 | you say Y here, the kernel will run on many, but not all, | |
52 | singleprocessor machines. On a singleprocessor machine, the kernel | |
53 | will run faster if you say N here. | |
54 | ||
55 | See also the <file:Documentation/smp.txt> and the SMP-HOWTO | |
56 | available at <http://www.tldp.org/docs.html#howto>. | |
57 | ||
58 | Even if you don't know what to do here, say Y. | |
59 | ||
60 | config NR_CPUS | |
61 | int "Maximum number of CPUs (2-64)" | |
62 | range 2 64 | |
63 | depends on SMP | |
64 | default "32" | |
65 | help | |
66 | This allows you to specify the maximum number of CPUs which this | |
67 | kernel will support. The maximum supported value is 64 and the | |
68 | minimum value which makes sense is 2. | |
69 | ||
70 | This is purely to save memory - each supported CPU adds | |
71 | approximately sixteen kilobytes to the kernel image. | |
72 | ||
73 | config HOTPLUG_CPU | |
74 | bool "Support for hot-pluggable CPUs" | |
75 | depends on SMP | |
76 | select HOTPLUG | |
77 | default n | |
78 | help | |
79 | Say Y here to be able to turn CPUs off and on. CPUs | |
80 | can be controlled through /sys/devices/system/cpu/cpu#. | |
81 | Say N if you want to disable CPU hotplug. | |
82 | ||
4bbf39c2 IM |
83 | config DEFAULT_MIGRATION_COST |
84 | int | |
85 | default "1000000" | |
86 | ||
1da177e4 LT |
87 | config MATHEMU |
88 | bool "IEEE FPU emulation" | |
89 | depends on MARCH_G5 | |
90 | help | |
91 | This option is required for IEEE compliant floating point arithmetic | |
92 | on older S/390 machines. Say Y unless you know your machine doesn't | |
93 | need this. | |
94 | ||
347a8dc3 | 95 | config COMPAT |
1da177e4 | 96 | bool "Kernel support for 31 bit emulation" |
347a8dc3 | 97 | depends on 64BIT |
1da177e4 LT |
98 | help |
99 | Select this option if you want to enable your system kernel to | |
100 | handle system-calls from ELF binaries for 31 bit ESA. This option | |
101 | (and some other stuff like libraries and such) is needed for | |
102 | executing 31 bit applications. It is safe to say "Y". | |
103 | ||
1da177e4 LT |
104 | config SYSVIPC_COMPAT |
105 | bool | |
106 | depends on COMPAT && SYSVIPC | |
107 | default y | |
108 | ||
109 | config BINFMT_ELF32 | |
110 | tristate "Kernel support for 31 bit ELF binaries" | |
347a8dc3 | 111 | depends on COMPAT |
1da177e4 LT |
112 | help |
113 | This allows you to run 32-bit Linux/ELF binaries on your zSeries | |
114 | in 64 bit mode. Everybody wants this; say Y. | |
115 | ||
116 | comment "Code generation options" | |
117 | ||
118 | choice | |
119 | prompt "Processor type" | |
120 | default MARCH_G5 | |
121 | ||
122 | config MARCH_G5 | |
123 | bool "S/390 model G5 and G6" | |
347a8dc3 | 124 | depends on !64BIT |
1da177e4 LT |
125 | help |
126 | Select this to build a 31 bit kernel that works | |
127 | on all S/390 and zSeries machines. | |
128 | ||
129 | config MARCH_Z900 | |
130 | bool "IBM eServer zSeries model z800 and z900" | |
131 | help | |
132 | Select this to optimize for zSeries machines. This | |
133 | will enable some optimizations that are not available | |
134 | on older 31 bit only CPUs. | |
135 | ||
136 | config MARCH_Z990 | |
137 | bool "IBM eServer zSeries model z890 and z990" | |
138 | help | |
139 | Select this enable optimizations for model z890/z990. | |
140 | This will be slightly faster but does not work on | |
141 | older machines such as the z900. | |
142 | ||
143 | endchoice | |
144 | ||
145 | config PACK_STACK | |
146 | bool "Pack kernel stack" | |
147 | help | |
148 | This option enables the compiler option -mkernel-backchain if it | |
149 | is available. If the option is available the compiler supports | |
150 | the new stack layout which dramatically reduces the minimum stack | |
151 | frame size. With an old compiler a non-leaf function needs a | |
152 | minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With | |
153 | -mkernel-backchain the minimum size drops to 16 byte on 31 bit | |
154 | and 24 byte on 64 bit. | |
155 | ||
156 | Say Y if you are unsure. | |
157 | ||
158 | config SMALL_STACK | |
159 | bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb" | |
160 | depends on PACK_STACK | |
161 | help | |
162 | If you say Y here and the compiler supports the -mkernel-backchain | |
163 | option the kernel will use a smaller kernel stack size. For 31 bit | |
164 | the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb | |
165 | instead of 16kb. This allows to run more thread on a system and | |
166 | reduces the pressure on the memory management for higher order | |
167 | page allocations. | |
168 | ||
169 | Say N if you are unsure. | |
170 | ||
171 | ||
172 | config CHECK_STACK | |
173 | bool "Detect kernel stack overflow" | |
174 | help | |
175 | This option enables the compiler option -mstack-guard and | |
176 | -mstack-size if they are available. If the compiler supports them | |
177 | it will emit additional code to each function prolog to trigger | |
178 | an illegal operation if the kernel stack is about to overflow. | |
179 | ||
180 | Say N if you are unsure. | |
181 | ||
182 | config STACK_GUARD | |
183 | int "Size of the guard area (128-1024)" | |
184 | range 128 1024 | |
185 | depends on CHECK_STACK | |
186 | default "256" | |
187 | help | |
188 | This allows you to specify the size of the guard area at the lower | |
189 | end of the kernel stack. If the kernel stack points into the guard | |
190 | area on function entry an illegal operation is triggered. The size | |
191 | needs to be a power of 2. Please keep in mind that the size of an | |
192 | interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. | |
193 | The minimum size for the stack guard should be 256 for 31 bit and | |
194 | 512 for 64 bit. | |
195 | ||
196 | config WARN_STACK | |
197 | bool "Emit compiler warnings for function with broken stack usage" | |
198 | help | |
199 | This option enables the compiler options -mwarn-framesize and | |
200 | -mwarn-dynamicstack. If the compiler supports these options it | |
201 | will generate warnings for function which either use alloca or | |
202 | create a stack frame bigger then CONFIG_WARN_STACK_SIZE. | |
203 | ||
204 | Say N if you are unsure. | |
205 | ||
206 | config WARN_STACK_SIZE | |
207 | int "Maximum frame size considered safe (128-2048)" | |
208 | range 128 2048 | |
209 | depends on WARN_STACK | |
210 | default "256" | |
211 | help | |
212 | This allows you to specify the maximum frame size a function may | |
213 | have without the compiler complaining about it. | |
214 | ||
3f22ab27 DH |
215 | source "mm/Kconfig" |
216 | ||
1da177e4 LT |
217 | comment "I/O subsystem configuration" |
218 | ||
219 | config MACHCHK_WARNING | |
220 | bool "Process warning machine checks" | |
221 | help | |
222 | Select this option if you want the machine check handler on IBM S/390 or | |
223 | zSeries to process warning machine checks (e.g. on power failures). | |
224 | If unsure, say "Y". | |
225 | ||
226 | config QDIO | |
227 | tristate "QDIO support" | |
228 | ---help--- | |
8129ee16 FP |
229 | This driver provides the Queued Direct I/O base support for |
230 | IBM mainframes. | |
1da177e4 LT |
231 | |
232 | For details please refer to the documentation provided by IBM at | |
233 | <http://www10.software.ibm.com/developerworks/opensource/linux390> | |
234 | ||
235 | To compile this driver as a module, choose M here: the | |
236 | module will be called qdio. | |
237 | ||
238 | If unsure, say Y. | |
239 | ||
240 | config QDIO_PERF_STATS | |
241 | bool "Performance statistics in /proc" | |
242 | depends on QDIO | |
243 | help | |
244 | Say Y here to get performance statistics in /proc/qdio_perf | |
245 | ||
246 | If unsure, say N. | |
247 | ||
248 | config QDIO_DEBUG | |
249 | bool "Extended debugging information" | |
250 | depends on QDIO | |
251 | help | |
8129ee16 FP |
252 | Say Y here to get extended debugging output in |
253 | /sys/kernel/debug/s390dbf/qdio... | |
1da177e4 LT |
254 | Warning: this option reduces the performance of the QDIO module. |
255 | ||
256 | If unsure, say N. | |
257 | ||
258 | comment "Misc" | |
259 | ||
260 | config PREEMPT | |
261 | bool "Preemptible Kernel" | |
262 | help | |
263 | This option reduces the latency of the kernel when reacting to | |
264 | real-time or interactive events by allowing a low priority process to | |
265 | be preempted even if it is in kernel mode executing a system call. | |
266 | This allows applications to run more reliably even when the system is | |
267 | under load. | |
268 | ||
269 | Say N if you are unsure. | |
270 | ||
271 | config IPL | |
272 | bool "Builtin IPL record support" | |
273 | help | |
274 | If you want to use the produced kernel to IPL directly from a | |
275 | device, you have to merge a bootsector specific to the device | |
276 | into the first bytes of the kernel. You will have to select the | |
277 | IPL device. | |
278 | ||
279 | choice | |
280 | prompt "IPL method generated into head.S" | |
281 | depends on IPL | |
282 | default IPL_TAPE | |
283 | help | |
284 | Select "tape" if you want to IPL the image from a Tape. | |
285 | ||
286 | Select "vm_reader" if you are running under VM/ESA and want | |
287 | to IPL the image from the emulated card reader. | |
288 | ||
289 | config IPL_TAPE | |
290 | bool "tape" | |
291 | ||
292 | config IPL_VM | |
293 | bool "vm_reader" | |
294 | ||
295 | endchoice | |
296 | ||
297 | source "fs/Kconfig.binfmt" | |
298 | ||
299 | config PROCESS_DEBUG | |
300 | bool "Show crashed user process info" | |
301 | help | |
302 | Say Y to print all process fault locations to the console. This is | |
303 | a debugging option; you probably do not want to set it unless you | |
304 | are an S390 port maintainer. | |
305 | ||
306 | config PFAULT | |
307 | bool "Pseudo page fault support" | |
308 | help | |
309 | Select this option, if you want to use PFAULT pseudo page fault | |
310 | handling under VM. If running native or in LPAR, this option | |
311 | has no effect. If your VM does not support PFAULT, PAGEEX | |
312 | pseudo page fault handling will be used. | |
313 | Note that VM 4.2 supports PFAULT but has a bug in its | |
314 | implementation that causes some problems. | |
315 | Everybody who wants to run Linux under VM != VM4.2 should select | |
316 | this option. | |
317 | ||
318 | config SHARED_KERNEL | |
319 | bool "VM shared kernel support" | |
320 | help | |
321 | Select this option, if you want to share the text segment of the | |
322 | Linux kernel between different VM guests. This reduces memory | |
323 | usage with lots of guests but greatly increases kernel size. | |
324 | You should only select this option if you know what you are | |
325 | doing and want to exploit this feature. | |
326 | ||
327 | config CMM | |
328 | tristate "Cooperative memory management" | |
329 | help | |
330 | Select this option, if you want to enable the kernel interface | |
331 | to reduce the memory size of the system. This is accomplished | |
332 | by allocating pages of memory and put them "on hold". This only | |
333 | makes sense for a system running under VM where the unused pages | |
334 | will be reused by VM for other guest systems. The interface | |
335 | allows an external monitor to balance memory of many systems. | |
336 | Everybody who wants to run Linux under VM should select this | |
337 | option. | |
338 | ||
339 | config CMM_PROC | |
340 | bool "/proc interface to cooperative memory management" | |
341 | depends on CMM | |
342 | help | |
343 | Select this option to enable the /proc interface to the | |
344 | cooperative memory management. | |
345 | ||
346 | config CMM_IUCV | |
347 | bool "IUCV special message interface to cooperative memory management" | |
348 | depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) | |
349 | help | |
350 | Select this option to enable the special message interface to | |
351 | the cooperative memory management. | |
352 | ||
353 | config VIRT_TIMER | |
354 | bool "Virtual CPU timer support" | |
355 | help | |
356 | This provides a kernel interface for virtual CPU timers. | |
357 | Default is disabled. | |
358 | ||
359 | config VIRT_CPU_ACCOUNTING | |
360 | bool "Base user process accounting on virtual cpu timer" | |
361 | depends on VIRT_TIMER | |
362 | help | |
363 | Select this option to use CPU timer deltas to do user | |
364 | process accounting. | |
365 | ||
366 | config APPLDATA_BASE | |
367 | bool "Linux - VM Monitor Stream, base infrastructure" | |
368 | depends on PROC_FS && VIRT_TIMER=y | |
369 | help | |
370 | This provides a kernel interface for creating and updating z/VM APPLDATA | |
371 | monitor records. The monitor records are updated at certain time | |
372 | intervals, once the timer is started. | |
373 | Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, | |
374 | i.e. enables or disables monitoring on the Linux side. | |
375 | A custom interval value (in seconds) can be written to | |
376 | /proc/appldata/interval. | |
377 | ||
378 | Defaults are 60 seconds interval and timer off. | |
379 | The /proc entries can also be read from, showing the current settings. | |
380 | ||
381 | config APPLDATA_MEM | |
382 | tristate "Monitor memory management statistics" | |
383 | depends on APPLDATA_BASE | |
384 | help | |
385 | This provides memory management related data to the Linux - VM Monitor | |
386 | Stream, like paging/swapping rate, memory utilisation, etc. | |
387 | Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM | |
388 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
389 | on the z/VM side. | |
390 | ||
391 | Default is disabled. | |
392 | The /proc entry can also be read from, showing the current settings. | |
393 | ||
394 | This can also be compiled as a module, which will be called | |
395 | appldata_mem.o. | |
396 | ||
397 | config APPLDATA_OS | |
398 | tristate "Monitor OS statistics" | |
399 | depends on APPLDATA_BASE | |
400 | help | |
401 | This provides OS related data to the Linux - VM Monitor Stream, like | |
402 | CPU utilisation, etc. | |
403 | Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM | |
404 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
405 | on the z/VM side. | |
406 | ||
407 | Default is disabled. | |
408 | This can also be compiled as a module, which will be called | |
409 | appldata_os.o. | |
410 | ||
411 | config APPLDATA_NET_SUM | |
412 | tristate "Monitor overall network statistics" | |
413 | depends on APPLDATA_BASE | |
414 | help | |
415 | This provides network related data to the Linux - VM Monitor Stream, | |
416 | currently there is only a total sum of network I/O statistics, no | |
417 | per-interface data. | |
418 | Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM | |
419 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
420 | on the z/VM side. | |
421 | ||
422 | Default is disabled. | |
423 | This can also be compiled as a module, which will be called | |
424 | appldata_net_sum.o. | |
425 | ||
426 | config NO_IDLE_HZ | |
427 | bool "No HZ timer ticks in idle" | |
428 | help | |
429 | Switches the regular HZ timer off when the system is going idle. | |
430 | This helps z/VM to detect that the Linux system is idle. VM can | |
431 | then "swap-out" this guest which reduces memory usage. It also | |
432 | reduces the overhead of idle systems. | |
433 | ||
434 | The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer. | |
435 | hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ | |
436 | timer is active. | |
437 | ||
438 | config NO_IDLE_HZ_INIT | |
439 | bool "HZ timer in idle off by default" | |
440 | depends on NO_IDLE_HZ | |
441 | help | |
442 | The HZ timer is switched off in idle by default. That means the | |
443 | HZ timer is already disabled at boot time. | |
444 | ||
cf13f0ea HC |
445 | config KEXEC |
446 | bool "kexec system call (EXPERIMENTAL)" | |
447 | depends on EXPERIMENTAL | |
448 | help | |
449 | kexec is a system call that implements the ability to shutdown your | |
450 | current kernel, and to start another kernel. It is like a reboot | |
451 | but is independent of hardware/microcode support. | |
452 | ||
1da177e4 LT |
453 | endmenu |
454 | ||
d5950b43 SR |
455 | source "net/Kconfig" |
456 | ||
1da177e4 LT |
457 | config PCMCIA |
458 | bool | |
459 | default n | |
460 | ||
461 | source "drivers/base/Kconfig" | |
462 | ||
61d3ad0e MS |
463 | source "drivers/connector/Kconfig" |
464 | ||
1da177e4 LT |
465 | source "drivers/scsi/Kconfig" |
466 | ||
467 | source "drivers/s390/Kconfig" | |
468 | ||
d5950b43 | 469 | source "drivers/net/Kconfig" |
1da177e4 LT |
470 | |
471 | source "fs/Kconfig" | |
472 | ||
473 | source "arch/s390/oprofile/Kconfig" | |
474 | ||
475 | source "arch/s390/Kconfig.debug" | |
476 | ||
477 | source "security/Kconfig" | |
478 | ||
479 | source "crypto/Kconfig" | |
480 | ||
481 | source "lib/Kconfig" |