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