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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 | ||
dbd70fb4 HC |
6 | config SCHED_MC |
7 | def_bool y | |
8 | depends on SMP | |
9 | ||
1da177e4 | 10 | config MMU |
61d48c2c | 11 | def_bool y |
1da177e4 | 12 | |
66701b14 | 13 | config ZONE_DMA |
118bcd31 HC |
14 | def_bool y |
15 | depends on 64BIT | |
66701b14 | 16 | |
2b105ff9 | 17 | config LOCKDEP_SUPPORT |
61d48c2c | 18 | def_bool y |
2b105ff9 | 19 | |
5bdc9b44 | 20 | config STACKTRACE_SUPPORT |
61d48c2c | 21 | def_bool y |
5bdc9b44 | 22 | |
a3afe70b HC |
23 | config HAVE_LATENCYTOP_SUPPORT |
24 | def_bool y | |
25 | ||
1da177e4 LT |
26 | config RWSEM_GENERIC_SPINLOCK |
27 | bool | |
28 | ||
29 | config RWSEM_XCHGADD_ALGORITHM | |
61d48c2c | 30 | def_bool y |
1da177e4 | 31 | |
f0d1b0b3 DH |
32 | config ARCH_HAS_ILOG2_U32 |
33 | bool | |
34 | default n | |
35 | ||
36 | config ARCH_HAS_ILOG2_U64 | |
37 | bool | |
38 | default n | |
39 | ||
7e33db4e | 40 | config GENERIC_HWEIGHT |
61d48c2c | 41 | def_bool y |
7e33db4e | 42 | |
dc64bef5 MS |
43 | config GENERIC_TIME |
44 | def_bool y | |
45 | ||
5a62b192 HC |
46 | config GENERIC_CLOCKEVENTS |
47 | def_bool y | |
48 | ||
c0007f1a HC |
49 | config GENERIC_BUG |
50 | bool | |
51 | depends on BUG | |
52 | default y | |
53 | ||
23db764d | 54 | config NO_IOMEM |
5ea81769 AV |
55 | def_bool y |
56 | ||
411f0f3e HC |
57 | config NO_DMA |
58 | def_bool y | |
59 | ||
b6b40c53 MS |
60 | config GENERIC_LOCKBREAK |
61 | bool | |
62 | default y | |
63 | depends on SMP && PREEMPT | |
64 | ||
1da177e4 LT |
65 | mainmenu "Linux Kernel Configuration" |
66 | ||
347a8dc3 | 67 | config S390 |
61d48c2c | 68 | def_bool y |
42d4b839 | 69 | select HAVE_OPROFILE |
3f550096 | 70 | select HAVE_KPROBES |
9edddaa2 | 71 | select HAVE_KRETPROBES |
1da177e4 | 72 | |
1da177e4 LT |
73 | source "init/Kconfig" |
74 | ||
75 | menu "Base setup" | |
76 | ||
77 | comment "Processor type and features" | |
78 | ||
5a62b192 HC |
79 | source "kernel/time/Kconfig" |
80 | ||
347a8dc3 | 81 | config 64BIT |
1da177e4 LT |
82 | bool "64 bit kernel" |
83 | help | |
84 | Select this option if you have a 64 bit IBM zSeries machine | |
85 | and want to use the 64 bit addressing mode. | |
86 | ||
d9f7a745 MS |
87 | config 32BIT |
88 | bool | |
89 | default y if !64BIT | |
90 | ||
1da177e4 LT |
91 | config SMP |
92 | bool "Symmetric multi-processing support" | |
93 | ---help--- | |
94 | This enables support for systems with more than one CPU. If you have | |
95 | a system with only one CPU, like most personal computers, say N. If | |
96 | you have a system with more than one CPU, say Y. | |
97 | ||
98 | If you say N here, the kernel will run on single and multiprocessor | |
99 | machines, but will use only one CPU of a multiprocessor machine. If | |
100 | you say Y here, the kernel will run on many, but not all, | |
101 | singleprocessor machines. On a singleprocessor machine, the kernel | |
102 | will run faster if you say N here. | |
103 | ||
03502faa AB |
104 | See also the SMP-HOWTO available at |
105 | <http://www.tldp.org/docs.html#howto>. | |
1da177e4 LT |
106 | |
107 | Even if you don't know what to do here, say Y. | |
108 | ||
109 | config NR_CPUS | |
110 | int "Maximum number of CPUs (2-64)" | |
111 | range 2 64 | |
112 | depends on SMP | |
057c5cb3 HC |
113 | default "32" if !64BIT |
114 | default "64" if 64BIT | |
1da177e4 LT |
115 | help |
116 | This allows you to specify the maximum number of CPUs which this | |
117 | kernel will support. The maximum supported value is 64 and the | |
118 | minimum value which makes sense is 2. | |
119 | ||
120 | This is purely to save memory - each supported CPU adds | |
121 | approximately sixteen kilobytes to the kernel image. | |
122 | ||
123 | config HOTPLUG_CPU | |
124 | bool "Support for hot-pluggable CPUs" | |
125 | depends on SMP | |
126 | select HOTPLUG | |
127 | default n | |
128 | help | |
129 | Say Y here to be able to turn CPUs off and on. CPUs | |
130 | can be controlled through /sys/devices/system/cpu/cpu#. | |
131 | Say N if you want to disable CPU hotplug. | |
132 | ||
133 | config MATHEMU | |
134 | bool "IEEE FPU emulation" | |
135 | depends on MARCH_G5 | |
136 | help | |
137 | This option is required for IEEE compliant floating point arithmetic | |
138 | on older S/390 machines. Say Y unless you know your machine doesn't | |
139 | need this. | |
140 | ||
347a8dc3 | 141 | config COMPAT |
1da177e4 | 142 | bool "Kernel support for 31 bit emulation" |
347a8dc3 | 143 | depends on 64BIT |
1da177e4 LT |
144 | help |
145 | Select this option if you want to enable your system kernel to | |
146 | handle system-calls from ELF binaries for 31 bit ESA. This option | |
147 | (and some other stuff like libraries and such) is needed for | |
148 | executing 31 bit applications. It is safe to say "Y". | |
149 | ||
1da177e4 LT |
150 | config SYSVIPC_COMPAT |
151 | bool | |
152 | depends on COMPAT && SYSVIPC | |
153 | default y | |
154 | ||
e65e1fc2 AV |
155 | config AUDIT_ARCH |
156 | bool | |
157 | default y | |
158 | ||
c1821c2e GS |
159 | config S390_SWITCH_AMODE |
160 | bool "Switch kernel/user addressing modes" | |
161 | help | |
162 | This option allows to switch the addressing modes of kernel and user | |
163 | space. The kernel parameter switch_amode=on will enable this feature, | |
164 | default is disabled. Enabling this (via kernel parameter) on machines | |
165 | earlier than IBM System z9-109 EC/BC will reduce system performance. | |
166 | ||
167 | Note that this option will also be selected by selecting the execute | |
168 | protection option below. Enabling the execute protection via the | |
169 | noexec kernel parameter will also switch the addressing modes, | |
170 | independent of the switch_amode kernel parameter. | |
171 | ||
172 | ||
173 | config S390_EXEC_PROTECT | |
174 | bool "Data execute protection" | |
175 | select S390_SWITCH_AMODE | |
176 | help | |
177 | This option allows to enable a buffer overflow protection for user | |
178 | space programs and it also selects the addressing mode option above. | |
179 | The kernel parameter noexec=on will enable this feature and also | |
180 | switch the addressing modes, default is disabled. Enabling this (via | |
181 | kernel parameter) on machines earlier than IBM System z9-109 EC/BC | |
182 | will reduce system performance. | |
183 | ||
1da177e4 LT |
184 | comment "Code generation options" |
185 | ||
186 | choice | |
187 | prompt "Processor type" | |
188 | default MARCH_G5 | |
189 | ||
190 | config MARCH_G5 | |
191 | bool "S/390 model G5 and G6" | |
347a8dc3 | 192 | depends on !64BIT |
1da177e4 LT |
193 | help |
194 | Select this to build a 31 bit kernel that works | |
195 | on all S/390 and zSeries machines. | |
196 | ||
197 | config MARCH_Z900 | |
198 | bool "IBM eServer zSeries model z800 and z900" | |
199 | help | |
200 | Select this to optimize for zSeries machines. This | |
201 | will enable some optimizations that are not available | |
202 | on older 31 bit only CPUs. | |
203 | ||
204 | config MARCH_Z990 | |
205 | bool "IBM eServer zSeries model z890 and z990" | |
206 | help | |
207 | Select this enable optimizations for model z890/z990. | |
208 | This will be slightly faster but does not work on | |
209 | older machines such as the z900. | |
210 | ||
0efa4703 CB |
211 | config MARCH_Z9_109 |
212 | bool "IBM System z9" | |
213 | help | |
214 | Select this to enable optimizations for IBM System z9-109, IBM | |
215 | System z9 Enterprise Class (z9 EC), and IBM System z9 Business | |
216 | Class (z9 BC). The kernel will be slightly faster but will not | |
217 | work on older machines such as the z990, z890, z900, and z800. | |
218 | ||
1da177e4 LT |
219 | endchoice |
220 | ||
221 | config PACK_STACK | |
222 | bool "Pack kernel stack" | |
223 | help | |
224 | This option enables the compiler option -mkernel-backchain if it | |
225 | is available. If the option is available the compiler supports | |
226 | the new stack layout which dramatically reduces the minimum stack | |
227 | frame size. With an old compiler a non-leaf function needs a | |
228 | minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With | |
229 | -mkernel-backchain the minimum size drops to 16 byte on 31 bit | |
230 | and 24 byte on 64 bit. | |
231 | ||
232 | Say Y if you are unsure. | |
233 | ||
234 | config SMALL_STACK | |
235 | bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb" | |
74f8f557 | 236 | depends on PACK_STACK && !LOCKDEP |
1da177e4 LT |
237 | help |
238 | If you say Y here and the compiler supports the -mkernel-backchain | |
239 | option the kernel will use a smaller kernel stack size. For 31 bit | |
240 | the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb | |
241 | instead of 16kb. This allows to run more thread on a system and | |
242 | reduces the pressure on the memory management for higher order | |
243 | page allocations. | |
244 | ||
245 | Say N if you are unsure. | |
246 | ||
247 | ||
248 | config CHECK_STACK | |
249 | bool "Detect kernel stack overflow" | |
250 | help | |
251 | This option enables the compiler option -mstack-guard and | |
252 | -mstack-size if they are available. If the compiler supports them | |
253 | it will emit additional code to each function prolog to trigger | |
254 | an illegal operation if the kernel stack is about to overflow. | |
255 | ||
256 | Say N if you are unsure. | |
257 | ||
258 | config STACK_GUARD | |
259 | int "Size of the guard area (128-1024)" | |
260 | range 128 1024 | |
261 | depends on CHECK_STACK | |
262 | default "256" | |
263 | help | |
264 | This allows you to specify the size of the guard area at the lower | |
265 | end of the kernel stack. If the kernel stack points into the guard | |
266 | area on function entry an illegal operation is triggered. The size | |
267 | needs to be a power of 2. Please keep in mind that the size of an | |
268 | interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. | |
269 | The minimum size for the stack guard should be 256 for 31 bit and | |
270 | 512 for 64 bit. | |
271 | ||
272 | config WARN_STACK | |
273 | bool "Emit compiler warnings for function with broken stack usage" | |
274 | help | |
275 | This option enables the compiler options -mwarn-framesize and | |
276 | -mwarn-dynamicstack. If the compiler supports these options it | |
277 | will generate warnings for function which either use alloca or | |
278 | create a stack frame bigger then CONFIG_WARN_STACK_SIZE. | |
279 | ||
280 | Say N if you are unsure. | |
281 | ||
282 | config WARN_STACK_SIZE | |
283 | int "Maximum frame size considered safe (128-2048)" | |
284 | range 128 2048 | |
285 | depends on WARN_STACK | |
286 | default "256" | |
287 | help | |
288 | This allows you to specify the maximum frame size a function may | |
289 | have without the compiler complaining about it. | |
290 | ||
39b742f9 HC |
291 | config ARCH_POPULATES_NODE_MAP |
292 | def_bool y | |
293 | ||
61d48c2c MS |
294 | comment "Kernel preemption" |
295 | ||
296 | source "kernel/Kconfig.preempt" | |
297 | ||
3f22ab27 DH |
298 | source "mm/Kconfig" |
299 | ||
1da177e4 LT |
300 | comment "I/O subsystem configuration" |
301 | ||
302 | config MACHCHK_WARNING | |
303 | bool "Process warning machine checks" | |
304 | help | |
305 | Select this option if you want the machine check handler on IBM S/390 or | |
306 | zSeries to process warning machine checks (e.g. on power failures). | |
307 | If unsure, say "Y". | |
308 | ||
309 | config QDIO | |
310 | tristate "QDIO support" | |
311 | ---help--- | |
8129ee16 | 312 | This driver provides the Queued Direct I/O base support for |
efca13bc | 313 | IBM System z. |
1da177e4 LT |
314 | |
315 | To compile this driver as a module, choose M here: the | |
316 | module will be called qdio. | |
317 | ||
318 | If unsure, say Y. | |
319 | ||
1da177e4 LT |
320 | config QDIO_DEBUG |
321 | bool "Extended debugging information" | |
322 | depends on QDIO | |
323 | help | |
8129ee16 FP |
324 | Say Y here to get extended debugging output in |
325 | /sys/kernel/debug/s390dbf/qdio... | |
1da177e4 LT |
326 | Warning: this option reduces the performance of the QDIO module. |
327 | ||
328 | If unsure, say N. | |
329 | ||
330 | comment "Misc" | |
331 | ||
1da177e4 LT |
332 | config IPL |
333 | bool "Builtin IPL record support" | |
334 | help | |
335 | If you want to use the produced kernel to IPL directly from a | |
336 | device, you have to merge a bootsector specific to the device | |
337 | into the first bytes of the kernel. You will have to select the | |
338 | IPL device. | |
339 | ||
340 | choice | |
341 | prompt "IPL method generated into head.S" | |
342 | depends on IPL | |
343 | default IPL_TAPE | |
344 | help | |
345 | Select "tape" if you want to IPL the image from a Tape. | |
346 | ||
347 | Select "vm_reader" if you are running under VM/ESA and want | |
348 | to IPL the image from the emulated card reader. | |
349 | ||
350 | config IPL_TAPE | |
351 | bool "tape" | |
352 | ||
353 | config IPL_VM | |
354 | bool "vm_reader" | |
355 | ||
356 | endchoice | |
357 | ||
358 | source "fs/Kconfig.binfmt" | |
359 | ||
684de39b HC |
360 | config FORCE_MAX_ZONEORDER |
361 | int | |
362 | default "9" | |
363 | ||
1da177e4 LT |
364 | config PROCESS_DEBUG |
365 | bool "Show crashed user process info" | |
366 | help | |
367 | Say Y to print all process fault locations to the console. This is | |
368 | a debugging option; you probably do not want to set it unless you | |
369 | are an S390 port maintainer. | |
370 | ||
371 | config PFAULT | |
372 | bool "Pseudo page fault support" | |
373 | help | |
374 | Select this option, if you want to use PFAULT pseudo page fault | |
375 | handling under VM. If running native or in LPAR, this option | |
376 | has no effect. If your VM does not support PFAULT, PAGEEX | |
377 | pseudo page fault handling will be used. | |
378 | Note that VM 4.2 supports PFAULT but has a bug in its | |
379 | implementation that causes some problems. | |
380 | Everybody who wants to run Linux under VM != VM4.2 should select | |
381 | this option. | |
382 | ||
383 | config SHARED_KERNEL | |
384 | bool "VM shared kernel support" | |
385 | help | |
386 | Select this option, if you want to share the text segment of the | |
387 | Linux kernel between different VM guests. This reduces memory | |
388 | usage with lots of guests but greatly increases kernel size. | |
9c9c1761 HC |
389 | Also if a kernel was IPL'ed from a shared segment the kexec system |
390 | call will not work. | |
1da177e4 LT |
391 | You should only select this option if you know what you are |
392 | doing and want to exploit this feature. | |
393 | ||
394 | config CMM | |
395 | tristate "Cooperative memory management" | |
396 | help | |
397 | Select this option, if you want to enable the kernel interface | |
398 | to reduce the memory size of the system. This is accomplished | |
399 | by allocating pages of memory and put them "on hold". This only | |
400 | makes sense for a system running under VM where the unused pages | |
401 | will be reused by VM for other guest systems. The interface | |
402 | allows an external monitor to balance memory of many systems. | |
403 | Everybody who wants to run Linux under VM should select this | |
404 | option. | |
405 | ||
406 | config CMM_PROC | |
407 | bool "/proc interface to cooperative memory management" | |
408 | depends on CMM | |
409 | help | |
410 | Select this option to enable the /proc interface to the | |
411 | cooperative memory management. | |
412 | ||
413 | config CMM_IUCV | |
414 | bool "IUCV special message interface to cooperative memory management" | |
415 | depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) | |
416 | help | |
417 | Select this option to enable the special message interface to | |
418 | the cooperative memory management. | |
419 | ||
420 | config VIRT_TIMER | |
421 | bool "Virtual CPU timer support" | |
422 | help | |
423 | This provides a kernel interface for virtual CPU timers. | |
424 | Default is disabled. | |
425 | ||
426 | config VIRT_CPU_ACCOUNTING | |
427 | bool "Base user process accounting on virtual cpu timer" | |
428 | depends on VIRT_TIMER | |
429 | help | |
430 | Select this option to use CPU timer deltas to do user | |
431 | process accounting. | |
432 | ||
433 | config APPLDATA_BASE | |
434 | bool "Linux - VM Monitor Stream, base infrastructure" | |
435 | depends on PROC_FS && VIRT_TIMER=y | |
436 | help | |
437 | This provides a kernel interface for creating and updating z/VM APPLDATA | |
438 | monitor records. The monitor records are updated at certain time | |
439 | intervals, once the timer is started. | |
440 | Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, | |
441 | i.e. enables or disables monitoring on the Linux side. | |
442 | A custom interval value (in seconds) can be written to | |
443 | /proc/appldata/interval. | |
444 | ||
445 | Defaults are 60 seconds interval and timer off. | |
446 | The /proc entries can also be read from, showing the current settings. | |
447 | ||
448 | config APPLDATA_MEM | |
449 | tristate "Monitor memory management statistics" | |
62fb2ba3 | 450 | depends on APPLDATA_BASE && VM_EVENT_COUNTERS |
1da177e4 LT |
451 | help |
452 | This provides memory management related data to the Linux - VM Monitor | |
453 | Stream, like paging/swapping rate, memory utilisation, etc. | |
454 | Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM | |
455 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
456 | on the z/VM side. | |
457 | ||
458 | Default is disabled. | |
459 | The /proc entry can also be read from, showing the current settings. | |
460 | ||
461 | This can also be compiled as a module, which will be called | |
462 | appldata_mem.o. | |
463 | ||
464 | config APPLDATA_OS | |
465 | tristate "Monitor OS statistics" | |
466 | depends on APPLDATA_BASE | |
467 | help | |
468 | This provides OS related data to the Linux - VM Monitor Stream, like | |
469 | CPU utilisation, etc. | |
470 | Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM | |
471 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
472 | on the z/VM side. | |
473 | ||
474 | Default is disabled. | |
475 | This can also be compiled as a module, which will be called | |
476 | appldata_os.o. | |
477 | ||
478 | config APPLDATA_NET_SUM | |
479 | tristate "Monitor overall network statistics" | |
480 | depends on APPLDATA_BASE | |
481 | help | |
482 | This provides network related data to the Linux - VM Monitor Stream, | |
483 | currently there is only a total sum of network I/O statistics, no | |
484 | per-interface data. | |
485 | Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM | |
486 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
487 | on the z/VM side. | |
488 | ||
489 | Default is disabled. | |
490 | This can also be compiled as a module, which will be called | |
491 | appldata_net_sum.o. | |
492 | ||
61d48c2c MS |
493 | source kernel/Kconfig.hz |
494 | ||
24bbb1fa MH |
495 | config S390_HYPFS_FS |
496 | bool "s390 hypervisor file system support" | |
497 | select SYS_HYPERVISOR | |
498 | default y | |
499 | help | |
500 | This is a virtual file system intended to provide accounting | |
501 | information in an s390 hypervisor environment. | |
502 | ||
cf13f0ea | 503 | config KEXEC |
07d43ce6 | 504 | bool "kexec system call" |
cf13f0ea HC |
505 | help |
506 | kexec is a system call that implements the ability to shutdown your | |
507 | current kernel, and to start another kernel. It is like a reboot | |
508 | but is independent of hardware/microcode support. | |
509 | ||
411ed322 MH |
510 | config ZFCPDUMP |
511 | tristate "zfcpdump support" | |
512 | select SMP | |
513 | default n | |
514 | help | |
515 | Select this option if you want to build an zfcpdump enabled kernel. | |
e403149c | 516 | Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this. |
411ed322 | 517 | |
1da177e4 LT |
518 | endmenu |
519 | ||
d5950b43 SR |
520 | source "net/Kconfig" |
521 | ||
1da177e4 | 522 | config PCMCIA |
61d48c2c | 523 | def_bool n |
1da177e4 | 524 | |
61d48c2c MS |
525 | config CCW |
526 | def_bool y | |
1da177e4 | 527 | |
61d48c2c | 528 | source "drivers/Kconfig" |
1da177e4 LT |
529 | |
530 | source "fs/Kconfig" | |
531 | ||
1da177e4 LT |
532 | source "arch/s390/Kconfig.debug" |
533 | ||
534 | source "security/Kconfig" | |
535 | ||
536 | source "crypto/Kconfig" | |
537 | ||
538 | source "lib/Kconfig" |