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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 | ||
66701b14 CL |
10 | config ZONE_DMA |
11 | bool | |
12 | default y | |
13 | ||
2b105ff9 IM |
14 | config LOCKDEP_SUPPORT |
15 | bool | |
16 | default y | |
17 | ||
5bdc9b44 HC |
18 | config STACKTRACE_SUPPORT |
19 | bool | |
20 | default y | |
21 | ||
1da177e4 LT |
22 | config RWSEM_GENERIC_SPINLOCK |
23 | bool | |
24 | ||
25 | config RWSEM_XCHGADD_ALGORITHM | |
26 | bool | |
27 | default y | |
28 | ||
f0d1b0b3 DH |
29 | config ARCH_HAS_ILOG2_U32 |
30 | bool | |
31 | default n | |
32 | ||
33 | config ARCH_HAS_ILOG2_U64 | |
34 | bool | |
35 | default n | |
36 | ||
7e33db4e AM |
37 | config GENERIC_HWEIGHT |
38 | bool | |
39 | default y | |
40 | ||
dc64bef5 MS |
41 | config GENERIC_TIME |
42 | def_bool y | |
43 | ||
1da177e4 LT |
44 | mainmenu "Linux Kernel Configuration" |
45 | ||
347a8dc3 | 46 | config S390 |
1da177e4 LT |
47 | bool |
48 | default y | |
49 | ||
1da177e4 LT |
50 | source "init/Kconfig" |
51 | ||
52 | menu "Base setup" | |
53 | ||
54 | comment "Processor type and features" | |
55 | ||
347a8dc3 | 56 | config 64BIT |
1da177e4 LT |
57 | bool "64 bit kernel" |
58 | help | |
59 | Select this option if you have a 64 bit IBM zSeries machine | |
60 | and want to use the 64 bit addressing mode. | |
61 | ||
d9f7a745 MS |
62 | config 32BIT |
63 | bool | |
64 | default y if !64BIT | |
65 | ||
1da177e4 LT |
66 | config SMP |
67 | bool "Symmetric multi-processing support" | |
68 | ---help--- | |
69 | This enables support for systems with more than one CPU. If you have | |
70 | a system with only one CPU, like most personal computers, say N. If | |
71 | you have a system with more than one CPU, say Y. | |
72 | ||
73 | If you say N here, the kernel will run on single and multiprocessor | |
74 | machines, but will use only one CPU of a multiprocessor machine. If | |
75 | you say Y here, the kernel will run on many, but not all, | |
76 | singleprocessor machines. On a singleprocessor machine, the kernel | |
77 | will run faster if you say N here. | |
78 | ||
79 | See also the <file:Documentation/smp.txt> and the SMP-HOWTO | |
80 | available at <http://www.tldp.org/docs.html#howto>. | |
81 | ||
82 | Even if you don't know what to do here, say Y. | |
83 | ||
84 | config NR_CPUS | |
85 | int "Maximum number of CPUs (2-64)" | |
86 | range 2 64 | |
87 | depends on SMP | |
88 | default "32" | |
89 | help | |
90 | This allows you to specify the maximum number of CPUs which this | |
91 | kernel will support. The maximum supported value is 64 and the | |
92 | minimum value which makes sense is 2. | |
93 | ||
94 | This is purely to save memory - each supported CPU adds | |
95 | approximately sixteen kilobytes to the kernel image. | |
96 | ||
97 | config HOTPLUG_CPU | |
98 | bool "Support for hot-pluggable CPUs" | |
99 | depends on SMP | |
100 | select HOTPLUG | |
101 | default n | |
102 | help | |
103 | Say Y here to be able to turn CPUs off and on. CPUs | |
104 | can be controlled through /sys/devices/system/cpu/cpu#. | |
105 | Say N if you want to disable CPU hotplug. | |
106 | ||
4bbf39c2 IM |
107 | config DEFAULT_MIGRATION_COST |
108 | int | |
109 | default "1000000" | |
110 | ||
1da177e4 LT |
111 | config MATHEMU |
112 | bool "IEEE FPU emulation" | |
113 | depends on MARCH_G5 | |
114 | help | |
115 | This option is required for IEEE compliant floating point arithmetic | |
116 | on older S/390 machines. Say Y unless you know your machine doesn't | |
117 | need this. | |
118 | ||
347a8dc3 | 119 | config COMPAT |
1da177e4 | 120 | bool "Kernel support for 31 bit emulation" |
347a8dc3 | 121 | depends on 64BIT |
1da177e4 LT |
122 | help |
123 | Select this option if you want to enable your system kernel to | |
124 | handle system-calls from ELF binaries for 31 bit ESA. This option | |
125 | (and some other stuff like libraries and such) is needed for | |
126 | executing 31 bit applications. It is safe to say "Y". | |
127 | ||
1da177e4 LT |
128 | config SYSVIPC_COMPAT |
129 | bool | |
130 | depends on COMPAT && SYSVIPC | |
131 | default y | |
132 | ||
e65e1fc2 AV |
133 | config AUDIT_ARCH |
134 | bool | |
135 | default y | |
136 | ||
c1821c2e GS |
137 | config S390_SWITCH_AMODE |
138 | bool "Switch kernel/user addressing modes" | |
139 | help | |
140 | This option allows to switch the addressing modes of kernel and user | |
141 | space. The kernel parameter switch_amode=on will enable this feature, | |
142 | default is disabled. Enabling this (via kernel parameter) on machines | |
143 | earlier than IBM System z9-109 EC/BC will reduce system performance. | |
144 | ||
145 | Note that this option will also be selected by selecting the execute | |
146 | protection option below. Enabling the execute protection via the | |
147 | noexec kernel parameter will also switch the addressing modes, | |
148 | independent of the switch_amode kernel parameter. | |
149 | ||
150 | ||
151 | config S390_EXEC_PROTECT | |
152 | bool "Data execute protection" | |
153 | select S390_SWITCH_AMODE | |
154 | help | |
155 | This option allows to enable a buffer overflow protection for user | |
156 | space programs and it also selects the addressing mode option above. | |
157 | The kernel parameter noexec=on will enable this feature and also | |
158 | switch the addressing modes, default is disabled. Enabling this (via | |
159 | kernel parameter) on machines earlier than IBM System z9-109 EC/BC | |
160 | will reduce system performance. | |
161 | ||
1da177e4 LT |
162 | comment "Code generation options" |
163 | ||
164 | choice | |
165 | prompt "Processor type" | |
166 | default MARCH_G5 | |
167 | ||
168 | config MARCH_G5 | |
169 | bool "S/390 model G5 and G6" | |
347a8dc3 | 170 | depends on !64BIT |
1da177e4 LT |
171 | help |
172 | Select this to build a 31 bit kernel that works | |
173 | on all S/390 and zSeries machines. | |
174 | ||
175 | config MARCH_Z900 | |
176 | bool "IBM eServer zSeries model z800 and z900" | |
177 | help | |
178 | Select this to optimize for zSeries machines. This | |
179 | will enable some optimizations that are not available | |
180 | on older 31 bit only CPUs. | |
181 | ||
182 | config MARCH_Z990 | |
183 | bool "IBM eServer zSeries model z890 and z990" | |
184 | help | |
185 | Select this enable optimizations for model z890/z990. | |
186 | This will be slightly faster but does not work on | |
187 | older machines such as the z900. | |
188 | ||
0efa4703 CB |
189 | config MARCH_Z9_109 |
190 | bool "IBM System z9" | |
191 | help | |
192 | Select this to enable optimizations for IBM System z9-109, IBM | |
193 | System z9 Enterprise Class (z9 EC), and IBM System z9 Business | |
194 | Class (z9 BC). The kernel will be slightly faster but will not | |
195 | work on older machines such as the z990, z890, z900, and z800. | |
196 | ||
1da177e4 LT |
197 | endchoice |
198 | ||
199 | config PACK_STACK | |
200 | bool "Pack kernel stack" | |
201 | help | |
202 | This option enables the compiler option -mkernel-backchain if it | |
203 | is available. If the option is available the compiler supports | |
204 | the new stack layout which dramatically reduces the minimum stack | |
205 | frame size. With an old compiler a non-leaf function needs a | |
206 | minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With | |
207 | -mkernel-backchain the minimum size drops to 16 byte on 31 bit | |
208 | and 24 byte on 64 bit. | |
209 | ||
210 | Say Y if you are unsure. | |
211 | ||
212 | config SMALL_STACK | |
213 | bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb" | |
74f8f557 | 214 | depends on PACK_STACK && !LOCKDEP |
1da177e4 LT |
215 | help |
216 | If you say Y here and the compiler supports the -mkernel-backchain | |
217 | option the kernel will use a smaller kernel stack size. For 31 bit | |
218 | the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb | |
219 | instead of 16kb. This allows to run more thread on a system and | |
220 | reduces the pressure on the memory management for higher order | |
221 | page allocations. | |
222 | ||
223 | Say N if you are unsure. | |
224 | ||
225 | ||
226 | config CHECK_STACK | |
227 | bool "Detect kernel stack overflow" | |
228 | help | |
229 | This option enables the compiler option -mstack-guard and | |
230 | -mstack-size if they are available. If the compiler supports them | |
231 | it will emit additional code to each function prolog to trigger | |
232 | an illegal operation if the kernel stack is about to overflow. | |
233 | ||
234 | Say N if you are unsure. | |
235 | ||
236 | config STACK_GUARD | |
237 | int "Size of the guard area (128-1024)" | |
238 | range 128 1024 | |
239 | depends on CHECK_STACK | |
240 | default "256" | |
241 | help | |
242 | This allows you to specify the size of the guard area at the lower | |
243 | end of the kernel stack. If the kernel stack points into the guard | |
244 | area on function entry an illegal operation is triggered. The size | |
245 | needs to be a power of 2. Please keep in mind that the size of an | |
246 | interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. | |
247 | The minimum size for the stack guard should be 256 for 31 bit and | |
248 | 512 for 64 bit. | |
249 | ||
250 | config WARN_STACK | |
251 | bool "Emit compiler warnings for function with broken stack usage" | |
252 | help | |
253 | This option enables the compiler options -mwarn-framesize and | |
254 | -mwarn-dynamicstack. If the compiler supports these options it | |
255 | will generate warnings for function which either use alloca or | |
256 | create a stack frame bigger then CONFIG_WARN_STACK_SIZE. | |
257 | ||
258 | Say N if you are unsure. | |
259 | ||
260 | config WARN_STACK_SIZE | |
261 | int "Maximum frame size considered safe (128-2048)" | |
262 | range 128 2048 | |
263 | depends on WARN_STACK | |
264 | default "256" | |
265 | help | |
266 | This allows you to specify the maximum frame size a function may | |
267 | have without the compiler complaining about it. | |
268 | ||
39b742f9 HC |
269 | config ARCH_POPULATES_NODE_MAP |
270 | def_bool y | |
271 | ||
3f22ab27 DH |
272 | source "mm/Kconfig" |
273 | ||
f4eb07c1 HC |
274 | config HOLES_IN_ZONE |
275 | def_bool y | |
276 | ||
1da177e4 LT |
277 | comment "I/O subsystem configuration" |
278 | ||
279 | config MACHCHK_WARNING | |
280 | bool "Process warning machine checks" | |
281 | help | |
282 | Select this option if you want the machine check handler on IBM S/390 or | |
283 | zSeries to process warning machine checks (e.g. on power failures). | |
284 | If unsure, say "Y". | |
285 | ||
286 | config QDIO | |
287 | tristate "QDIO support" | |
288 | ---help--- | |
8129ee16 FP |
289 | This driver provides the Queued Direct I/O base support for |
290 | IBM mainframes. | |
1da177e4 LT |
291 | |
292 | For details please refer to the documentation provided by IBM at | |
293 | <http://www10.software.ibm.com/developerworks/opensource/linux390> | |
294 | ||
295 | To compile this driver as a module, choose M here: the | |
296 | module will be called qdio. | |
297 | ||
298 | If unsure, say Y. | |
299 | ||
1da177e4 LT |
300 | config QDIO_DEBUG |
301 | bool "Extended debugging information" | |
302 | depends on QDIO | |
303 | help | |
8129ee16 FP |
304 | Say Y here to get extended debugging output in |
305 | /sys/kernel/debug/s390dbf/qdio... | |
1da177e4 LT |
306 | Warning: this option reduces the performance of the QDIO module. |
307 | ||
308 | If unsure, say N. | |
309 | ||
310 | comment "Misc" | |
311 | ||
312 | config PREEMPT | |
313 | bool "Preemptible Kernel" | |
314 | help | |
315 | This option reduces the latency of the kernel when reacting to | |
316 | real-time or interactive events by allowing a low priority process to | |
317 | be preempted even if it is in kernel mode executing a system call. | |
318 | This allows applications to run more reliably even when the system is | |
319 | under load. | |
320 | ||
321 | Say N if you are unsure. | |
322 | ||
323 | config IPL | |
324 | bool "Builtin IPL record support" | |
325 | help | |
326 | If you want to use the produced kernel to IPL directly from a | |
327 | device, you have to merge a bootsector specific to the device | |
328 | into the first bytes of the kernel. You will have to select the | |
329 | IPL device. | |
330 | ||
331 | choice | |
332 | prompt "IPL method generated into head.S" | |
333 | depends on IPL | |
334 | default IPL_TAPE | |
335 | help | |
336 | Select "tape" if you want to IPL the image from a Tape. | |
337 | ||
338 | Select "vm_reader" if you are running under VM/ESA and want | |
339 | to IPL the image from the emulated card reader. | |
340 | ||
341 | config IPL_TAPE | |
342 | bool "tape" | |
343 | ||
344 | config IPL_VM | |
345 | bool "vm_reader" | |
346 | ||
347 | endchoice | |
348 | ||
349 | source "fs/Kconfig.binfmt" | |
350 | ||
351 | config PROCESS_DEBUG | |
352 | bool "Show crashed user process info" | |
353 | help | |
354 | Say Y to print all process fault locations to the console. This is | |
355 | a debugging option; you probably do not want to set it unless you | |
356 | are an S390 port maintainer. | |
357 | ||
358 | config PFAULT | |
359 | bool "Pseudo page fault support" | |
360 | help | |
361 | Select this option, if you want to use PFAULT pseudo page fault | |
362 | handling under VM. If running native or in LPAR, this option | |
363 | has no effect. If your VM does not support PFAULT, PAGEEX | |
364 | pseudo page fault handling will be used. | |
365 | Note that VM 4.2 supports PFAULT but has a bug in its | |
366 | implementation that causes some problems. | |
367 | Everybody who wants to run Linux under VM != VM4.2 should select | |
368 | this option. | |
369 | ||
370 | config SHARED_KERNEL | |
371 | bool "VM shared kernel support" | |
372 | help | |
373 | Select this option, if you want to share the text segment of the | |
374 | Linux kernel between different VM guests. This reduces memory | |
375 | usage with lots of guests but greatly increases kernel size. | |
376 | You should only select this option if you know what you are | |
377 | doing and want to exploit this feature. | |
378 | ||
379 | config CMM | |
380 | tristate "Cooperative memory management" | |
381 | help | |
382 | Select this option, if you want to enable the kernel interface | |
383 | to reduce the memory size of the system. This is accomplished | |
384 | by allocating pages of memory and put them "on hold". This only | |
385 | makes sense for a system running under VM where the unused pages | |
386 | will be reused by VM for other guest systems. The interface | |
387 | allows an external monitor to balance memory of many systems. | |
388 | Everybody who wants to run Linux under VM should select this | |
389 | option. | |
390 | ||
391 | config CMM_PROC | |
392 | bool "/proc interface to cooperative memory management" | |
393 | depends on CMM | |
394 | help | |
395 | Select this option to enable the /proc interface to the | |
396 | cooperative memory management. | |
397 | ||
398 | config CMM_IUCV | |
399 | bool "IUCV special message interface to cooperative memory management" | |
400 | depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) | |
401 | help | |
402 | Select this option to enable the special message interface to | |
403 | the cooperative memory management. | |
404 | ||
405 | config VIRT_TIMER | |
406 | bool "Virtual CPU timer support" | |
407 | help | |
408 | This provides a kernel interface for virtual CPU timers. | |
409 | Default is disabled. | |
410 | ||
411 | config VIRT_CPU_ACCOUNTING | |
412 | bool "Base user process accounting on virtual cpu timer" | |
413 | depends on VIRT_TIMER | |
414 | help | |
415 | Select this option to use CPU timer deltas to do user | |
416 | process accounting. | |
417 | ||
418 | config APPLDATA_BASE | |
419 | bool "Linux - VM Monitor Stream, base infrastructure" | |
420 | depends on PROC_FS && VIRT_TIMER=y | |
421 | help | |
422 | This provides a kernel interface for creating and updating z/VM APPLDATA | |
423 | monitor records. The monitor records are updated at certain time | |
424 | intervals, once the timer is started. | |
425 | Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, | |
426 | i.e. enables or disables monitoring on the Linux side. | |
427 | A custom interval value (in seconds) can be written to | |
428 | /proc/appldata/interval. | |
429 | ||
430 | Defaults are 60 seconds interval and timer off. | |
431 | The /proc entries can also be read from, showing the current settings. | |
432 | ||
433 | config APPLDATA_MEM | |
434 | tristate "Monitor memory management statistics" | |
62fb2ba3 | 435 | depends on APPLDATA_BASE && VM_EVENT_COUNTERS |
1da177e4 LT |
436 | help |
437 | This provides memory management related data to the Linux - VM Monitor | |
438 | Stream, like paging/swapping rate, memory utilisation, etc. | |
439 | Writing 1 or 0 to /proc/appldata/memory 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 | The /proc entry can also be read from, showing the current settings. | |
445 | ||
446 | This can also be compiled as a module, which will be called | |
447 | appldata_mem.o. | |
448 | ||
449 | config APPLDATA_OS | |
450 | tristate "Monitor OS statistics" | |
451 | depends on APPLDATA_BASE | |
452 | help | |
453 | This provides OS related data to the Linux - VM Monitor Stream, like | |
454 | CPU utilisation, etc. | |
455 | Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM | |
456 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
457 | on the z/VM side. | |
458 | ||
459 | Default is disabled. | |
460 | This can also be compiled as a module, which will be called | |
461 | appldata_os.o. | |
462 | ||
463 | config APPLDATA_NET_SUM | |
464 | tristate "Monitor overall network statistics" | |
465 | depends on APPLDATA_BASE | |
466 | help | |
467 | This provides network related data to the Linux - VM Monitor Stream, | |
468 | currently there is only a total sum of network I/O statistics, no | |
469 | per-interface data. | |
470 | Writing 1 or 0 to /proc/appldata/net_sum 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_net_sum.o. | |
477 | ||
478 | config NO_IDLE_HZ | |
479 | bool "No HZ timer ticks in idle" | |
480 | help | |
481 | Switches the regular HZ timer off when the system is going idle. | |
482 | This helps z/VM to detect that the Linux system is idle. VM can | |
483 | then "swap-out" this guest which reduces memory usage. It also | |
484 | reduces the overhead of idle systems. | |
485 | ||
486 | The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer. | |
487 | hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ | |
488 | timer is active. | |
489 | ||
490 | config NO_IDLE_HZ_INIT | |
491 | bool "HZ timer in idle off by default" | |
492 | depends on NO_IDLE_HZ | |
493 | help | |
494 | The HZ timer is switched off in idle by default. That means the | |
495 | HZ timer is already disabled at boot time. | |
496 | ||
24bbb1fa MH |
497 | config S390_HYPFS_FS |
498 | bool "s390 hypervisor file system support" | |
499 | select SYS_HYPERVISOR | |
500 | default y | |
501 | help | |
502 | This is a virtual file system intended to provide accounting | |
503 | information in an s390 hypervisor environment. | |
504 | ||
cf13f0ea | 505 | config KEXEC |
07d43ce6 | 506 | bool "kexec system call" |
cf13f0ea HC |
507 | help |
508 | kexec is a system call that implements the ability to shutdown your | |
509 | current kernel, and to start another kernel. It is like a reboot | |
510 | but is independent of hardware/microcode support. | |
511 | ||
1da177e4 LT |
512 | endmenu |
513 | ||
d5950b43 SR |
514 | source "net/Kconfig" |
515 | ||
1da177e4 LT |
516 | config PCMCIA |
517 | bool | |
518 | default n | |
519 | ||
520 | source "drivers/base/Kconfig" | |
521 | ||
61d3ad0e MS |
522 | source "drivers/connector/Kconfig" |
523 | ||
1da177e4 LT |
524 | source "drivers/scsi/Kconfig" |
525 | ||
526 | source "drivers/s390/Kconfig" | |
527 | ||
d5950b43 | 528 | source "drivers/net/Kconfig" |
1da177e4 LT |
529 | |
530 | source "fs/Kconfig" | |
531 | ||
4ba069b8 MG |
532 | menu "Instrumentation Support" |
533 | ||
1da177e4 LT |
534 | source "arch/s390/oprofile/Kconfig" |
535 | ||
4ba069b8 MG |
536 | config KPROBES |
537 | bool "Kprobes (EXPERIMENTAL)" | |
538 | depends on EXPERIMENTAL && MODULES | |
539 | help | |
540 | Kprobes allows you to trap at almost any kernel address and | |
541 | execute a callback function. register_kprobe() establishes | |
542 | a probepoint and specifies the callback. Kprobes is useful | |
543 | for kernel debugging, non-intrusive instrumentation and testing. | |
544 | If in doubt, say "N". | |
545 | ||
546 | endmenu | |
547 | ||
1da177e4 LT |
548 | source "arch/s390/Kconfig.debug" |
549 | ||
550 | source "security/Kconfig" | |
551 | ||
552 | source "crypto/Kconfig" | |
553 | ||
554 | source "lib/Kconfig" |