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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 | ||
2b105ff9 IM |
10 | config LOCKDEP_SUPPORT |
11 | bool | |
12 | default y | |
13 | ||
5bdc9b44 HC |
14 | config STACKTRACE_SUPPORT |
15 | bool | |
16 | default y | |
17 | ||
1da177e4 LT |
18 | config RWSEM_GENERIC_SPINLOCK |
19 | bool | |
20 | ||
21 | config RWSEM_XCHGADD_ALGORITHM | |
22 | bool | |
23 | default y | |
24 | ||
f0d1b0b3 DH |
25 | config ARCH_HAS_ILOG2_U32 |
26 | bool | |
27 | default n | |
28 | ||
29 | config ARCH_HAS_ILOG2_U64 | |
30 | bool | |
31 | default n | |
32 | ||
7e33db4e AM |
33 | config GENERIC_HWEIGHT |
34 | bool | |
35 | default y | |
36 | ||
dc64bef5 MS |
37 | config GENERIC_TIME |
38 | def_bool y | |
39 | ||
1da177e4 LT |
40 | mainmenu "Linux Kernel Configuration" |
41 | ||
347a8dc3 | 42 | config S390 |
1da177e4 LT |
43 | bool |
44 | default y | |
45 | ||
1da177e4 LT |
46 | source "init/Kconfig" |
47 | ||
48 | menu "Base setup" | |
49 | ||
50 | comment "Processor type and features" | |
51 | ||
347a8dc3 | 52 | config 64BIT |
1da177e4 LT |
53 | bool "64 bit kernel" |
54 | help | |
55 | Select this option if you have a 64 bit IBM zSeries machine | |
56 | and want to use the 64 bit addressing mode. | |
57 | ||
d9f7a745 MS |
58 | config 32BIT |
59 | bool | |
60 | default y if !64BIT | |
61 | ||
1da177e4 LT |
62 | config SMP |
63 | bool "Symmetric multi-processing support" | |
64 | ---help--- | |
65 | This enables support for systems with more than one CPU. If you have | |
66 | a system with only one CPU, like most personal computers, say N. If | |
67 | you have a system with more than one CPU, say Y. | |
68 | ||
69 | If you say N here, the kernel will run on single and multiprocessor | |
70 | machines, but will use only one CPU of a multiprocessor machine. If | |
71 | you say Y here, the kernel will run on many, but not all, | |
72 | singleprocessor machines. On a singleprocessor machine, the kernel | |
73 | will run faster if you say N here. | |
74 | ||
75 | See also the <file:Documentation/smp.txt> and the SMP-HOWTO | |
76 | available at <http://www.tldp.org/docs.html#howto>. | |
77 | ||
78 | Even if you don't know what to do here, say Y. | |
79 | ||
80 | config NR_CPUS | |
81 | int "Maximum number of CPUs (2-64)" | |
82 | range 2 64 | |
83 | depends on SMP | |
84 | default "32" | |
85 | help | |
86 | This allows you to specify the maximum number of CPUs which this | |
87 | kernel will support. The maximum supported value is 64 and the | |
88 | minimum value which makes sense is 2. | |
89 | ||
90 | This is purely to save memory - each supported CPU adds | |
91 | approximately sixteen kilobytes to the kernel image. | |
92 | ||
93 | config HOTPLUG_CPU | |
94 | bool "Support for hot-pluggable CPUs" | |
95 | depends on SMP | |
96 | select HOTPLUG | |
97 | default n | |
98 | help | |
99 | Say Y here to be able to turn CPUs off and on. CPUs | |
100 | can be controlled through /sys/devices/system/cpu/cpu#. | |
101 | Say N if you want to disable CPU hotplug. | |
102 | ||
4bbf39c2 IM |
103 | config DEFAULT_MIGRATION_COST |
104 | int | |
105 | default "1000000" | |
106 | ||
1da177e4 LT |
107 | config MATHEMU |
108 | bool "IEEE FPU emulation" | |
109 | depends on MARCH_G5 | |
110 | help | |
111 | This option is required for IEEE compliant floating point arithmetic | |
112 | on older S/390 machines. Say Y unless you know your machine doesn't | |
113 | need this. | |
114 | ||
347a8dc3 | 115 | config COMPAT |
1da177e4 | 116 | bool "Kernel support for 31 bit emulation" |
347a8dc3 | 117 | depends on 64BIT |
1da177e4 LT |
118 | help |
119 | Select this option if you want to enable your system kernel to | |
120 | handle system-calls from ELF binaries for 31 bit ESA. This option | |
121 | (and some other stuff like libraries and such) is needed for | |
122 | executing 31 bit applications. It is safe to say "Y". | |
123 | ||
1da177e4 LT |
124 | config SYSVIPC_COMPAT |
125 | bool | |
126 | depends on COMPAT && SYSVIPC | |
127 | default y | |
128 | ||
e65e1fc2 AV |
129 | config AUDIT_ARCH |
130 | bool | |
131 | default y | |
132 | ||
c1821c2e GS |
133 | config S390_SWITCH_AMODE |
134 | bool "Switch kernel/user addressing modes" | |
135 | help | |
136 | This option allows to switch the addressing modes of kernel and user | |
137 | space. The kernel parameter switch_amode=on will enable this feature, | |
138 | default is disabled. Enabling this (via kernel parameter) on machines | |
139 | earlier than IBM System z9-109 EC/BC will reduce system performance. | |
140 | ||
141 | Note that this option will also be selected by selecting the execute | |
142 | protection option below. Enabling the execute protection via the | |
143 | noexec kernel parameter will also switch the addressing modes, | |
144 | independent of the switch_amode kernel parameter. | |
145 | ||
146 | ||
147 | config S390_EXEC_PROTECT | |
148 | bool "Data execute protection" | |
149 | select S390_SWITCH_AMODE | |
150 | help | |
151 | This option allows to enable a buffer overflow protection for user | |
152 | space programs and it also selects the addressing mode option above. | |
153 | The kernel parameter noexec=on will enable this feature and also | |
154 | switch the addressing modes, default is disabled. Enabling this (via | |
155 | kernel parameter) on machines earlier than IBM System z9-109 EC/BC | |
156 | will reduce system performance. | |
157 | ||
1da177e4 LT |
158 | comment "Code generation options" |
159 | ||
160 | choice | |
161 | prompt "Processor type" | |
162 | default MARCH_G5 | |
163 | ||
164 | config MARCH_G5 | |
165 | bool "S/390 model G5 and G6" | |
347a8dc3 | 166 | depends on !64BIT |
1da177e4 LT |
167 | help |
168 | Select this to build a 31 bit kernel that works | |
169 | on all S/390 and zSeries machines. | |
170 | ||
171 | config MARCH_Z900 | |
172 | bool "IBM eServer zSeries model z800 and z900" | |
173 | help | |
174 | Select this to optimize for zSeries machines. This | |
175 | will enable some optimizations that are not available | |
176 | on older 31 bit only CPUs. | |
177 | ||
178 | config MARCH_Z990 | |
179 | bool "IBM eServer zSeries model z890 and z990" | |
180 | help | |
181 | Select this enable optimizations for model z890/z990. | |
182 | This will be slightly faster but does not work on | |
183 | older machines such as the z900. | |
184 | ||
0efa4703 CB |
185 | config MARCH_Z9_109 |
186 | bool "IBM System z9" | |
187 | help | |
188 | Select this to enable optimizations for IBM System z9-109, IBM | |
189 | System z9 Enterprise Class (z9 EC), and IBM System z9 Business | |
190 | Class (z9 BC). The kernel will be slightly faster but will not | |
191 | work on older machines such as the z990, z890, z900, and z800. | |
192 | ||
1da177e4 LT |
193 | endchoice |
194 | ||
195 | config PACK_STACK | |
196 | bool "Pack kernel stack" | |
197 | help | |
198 | This option enables the compiler option -mkernel-backchain if it | |
199 | is available. If the option is available the compiler supports | |
200 | the new stack layout which dramatically reduces the minimum stack | |
201 | frame size. With an old compiler a non-leaf function needs a | |
202 | minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With | |
203 | -mkernel-backchain the minimum size drops to 16 byte on 31 bit | |
204 | and 24 byte on 64 bit. | |
205 | ||
206 | Say Y if you are unsure. | |
207 | ||
208 | config SMALL_STACK | |
209 | bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb" | |
74f8f557 | 210 | depends on PACK_STACK && !LOCKDEP |
1da177e4 LT |
211 | help |
212 | If you say Y here and the compiler supports the -mkernel-backchain | |
213 | option the kernel will use a smaller kernel stack size. For 31 bit | |
214 | the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb | |
215 | instead of 16kb. This allows to run more thread on a system and | |
216 | reduces the pressure on the memory management for higher order | |
217 | page allocations. | |
218 | ||
219 | Say N if you are unsure. | |
220 | ||
221 | ||
222 | config CHECK_STACK | |
223 | bool "Detect kernel stack overflow" | |
224 | help | |
225 | This option enables the compiler option -mstack-guard and | |
226 | -mstack-size if they are available. If the compiler supports them | |
227 | it will emit additional code to each function prolog to trigger | |
228 | an illegal operation if the kernel stack is about to overflow. | |
229 | ||
230 | Say N if you are unsure. | |
231 | ||
232 | config STACK_GUARD | |
233 | int "Size of the guard area (128-1024)" | |
234 | range 128 1024 | |
235 | depends on CHECK_STACK | |
236 | default "256" | |
237 | help | |
238 | This allows you to specify the size of the guard area at the lower | |
239 | end of the kernel stack. If the kernel stack points into the guard | |
240 | area on function entry an illegal operation is triggered. The size | |
241 | needs to be a power of 2. Please keep in mind that the size of an | |
242 | interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. | |
243 | The minimum size for the stack guard should be 256 for 31 bit and | |
244 | 512 for 64 bit. | |
245 | ||
246 | config WARN_STACK | |
247 | bool "Emit compiler warnings for function with broken stack usage" | |
248 | help | |
249 | This option enables the compiler options -mwarn-framesize and | |
250 | -mwarn-dynamicstack. If the compiler supports these options it | |
251 | will generate warnings for function which either use alloca or | |
252 | create a stack frame bigger then CONFIG_WARN_STACK_SIZE. | |
253 | ||
254 | Say N if you are unsure. | |
255 | ||
256 | config WARN_STACK_SIZE | |
257 | int "Maximum frame size considered safe (128-2048)" | |
258 | range 128 2048 | |
259 | depends on WARN_STACK | |
260 | default "256" | |
261 | help | |
262 | This allows you to specify the maximum frame size a function may | |
263 | have without the compiler complaining about it. | |
264 | ||
39b742f9 HC |
265 | config ARCH_POPULATES_NODE_MAP |
266 | def_bool y | |
267 | ||
3f22ab27 DH |
268 | source "mm/Kconfig" |
269 | ||
f4eb07c1 HC |
270 | config HOLES_IN_ZONE |
271 | def_bool y | |
272 | ||
1da177e4 LT |
273 | comment "I/O subsystem configuration" |
274 | ||
275 | config MACHCHK_WARNING | |
276 | bool "Process warning machine checks" | |
277 | help | |
278 | Select this option if you want the machine check handler on IBM S/390 or | |
279 | zSeries to process warning machine checks (e.g. on power failures). | |
280 | If unsure, say "Y". | |
281 | ||
282 | config QDIO | |
283 | tristate "QDIO support" | |
284 | ---help--- | |
8129ee16 FP |
285 | This driver provides the Queued Direct I/O base support for |
286 | IBM mainframes. | |
1da177e4 LT |
287 | |
288 | For details please refer to the documentation provided by IBM at | |
289 | <http://www10.software.ibm.com/developerworks/opensource/linux390> | |
290 | ||
291 | To compile this driver as a module, choose M here: the | |
292 | module will be called qdio. | |
293 | ||
294 | If unsure, say Y. | |
295 | ||
1da177e4 LT |
296 | config QDIO_DEBUG |
297 | bool "Extended debugging information" | |
298 | depends on QDIO | |
299 | help | |
8129ee16 FP |
300 | Say Y here to get extended debugging output in |
301 | /sys/kernel/debug/s390dbf/qdio... | |
1da177e4 LT |
302 | Warning: this option reduces the performance of the QDIO module. |
303 | ||
304 | If unsure, say N. | |
305 | ||
306 | comment "Misc" | |
307 | ||
308 | config PREEMPT | |
309 | bool "Preemptible Kernel" | |
310 | help | |
311 | This option reduces the latency of the kernel when reacting to | |
312 | real-time or interactive events by allowing a low priority process to | |
313 | be preempted even if it is in kernel mode executing a system call. | |
314 | This allows applications to run more reliably even when the system is | |
315 | under load. | |
316 | ||
317 | Say N if you are unsure. | |
318 | ||
319 | config IPL | |
320 | bool "Builtin IPL record support" | |
321 | help | |
322 | If you want to use the produced kernel to IPL directly from a | |
323 | device, you have to merge a bootsector specific to the device | |
324 | into the first bytes of the kernel. You will have to select the | |
325 | IPL device. | |
326 | ||
327 | choice | |
328 | prompt "IPL method generated into head.S" | |
329 | depends on IPL | |
330 | default IPL_TAPE | |
331 | help | |
332 | Select "tape" if you want to IPL the image from a Tape. | |
333 | ||
334 | Select "vm_reader" if you are running under VM/ESA and want | |
335 | to IPL the image from the emulated card reader. | |
336 | ||
337 | config IPL_TAPE | |
338 | bool "tape" | |
339 | ||
340 | config IPL_VM | |
341 | bool "vm_reader" | |
342 | ||
343 | endchoice | |
344 | ||
345 | source "fs/Kconfig.binfmt" | |
346 | ||
347 | config PROCESS_DEBUG | |
348 | bool "Show crashed user process info" | |
349 | help | |
350 | Say Y to print all process fault locations to the console. This is | |
351 | a debugging option; you probably do not want to set it unless you | |
352 | are an S390 port maintainer. | |
353 | ||
354 | config PFAULT | |
355 | bool "Pseudo page fault support" | |
356 | help | |
357 | Select this option, if you want to use PFAULT pseudo page fault | |
358 | handling under VM. If running native or in LPAR, this option | |
359 | has no effect. If your VM does not support PFAULT, PAGEEX | |
360 | pseudo page fault handling will be used. | |
361 | Note that VM 4.2 supports PFAULT but has a bug in its | |
362 | implementation that causes some problems. | |
363 | Everybody who wants to run Linux under VM != VM4.2 should select | |
364 | this option. | |
365 | ||
366 | config SHARED_KERNEL | |
367 | bool "VM shared kernel support" | |
368 | help | |
369 | Select this option, if you want to share the text segment of the | |
370 | Linux kernel between different VM guests. This reduces memory | |
371 | usage with lots of guests but greatly increases kernel size. | |
372 | You should only select this option if you know what you are | |
373 | doing and want to exploit this feature. | |
374 | ||
375 | config CMM | |
376 | tristate "Cooperative memory management" | |
377 | help | |
378 | Select this option, if you want to enable the kernel interface | |
379 | to reduce the memory size of the system. This is accomplished | |
380 | by allocating pages of memory and put them "on hold". This only | |
381 | makes sense for a system running under VM where the unused pages | |
382 | will be reused by VM for other guest systems. The interface | |
383 | allows an external monitor to balance memory of many systems. | |
384 | Everybody who wants to run Linux under VM should select this | |
385 | option. | |
386 | ||
387 | config CMM_PROC | |
388 | bool "/proc interface to cooperative memory management" | |
389 | depends on CMM | |
390 | help | |
391 | Select this option to enable the /proc interface to the | |
392 | cooperative memory management. | |
393 | ||
394 | config CMM_IUCV | |
395 | bool "IUCV special message interface to cooperative memory management" | |
396 | depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) | |
397 | help | |
398 | Select this option to enable the special message interface to | |
399 | the cooperative memory management. | |
400 | ||
401 | config VIRT_TIMER | |
402 | bool "Virtual CPU timer support" | |
403 | help | |
404 | This provides a kernel interface for virtual CPU timers. | |
405 | Default is disabled. | |
406 | ||
407 | config VIRT_CPU_ACCOUNTING | |
408 | bool "Base user process accounting on virtual cpu timer" | |
409 | depends on VIRT_TIMER | |
410 | help | |
411 | Select this option to use CPU timer deltas to do user | |
412 | process accounting. | |
413 | ||
414 | config APPLDATA_BASE | |
415 | bool "Linux - VM Monitor Stream, base infrastructure" | |
416 | depends on PROC_FS && VIRT_TIMER=y | |
417 | help | |
418 | This provides a kernel interface for creating and updating z/VM APPLDATA | |
419 | monitor records. The monitor records are updated at certain time | |
420 | intervals, once the timer is started. | |
421 | Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, | |
422 | i.e. enables or disables monitoring on the Linux side. | |
423 | A custom interval value (in seconds) can be written to | |
424 | /proc/appldata/interval. | |
425 | ||
426 | Defaults are 60 seconds interval and timer off. | |
427 | The /proc entries can also be read from, showing the current settings. | |
428 | ||
429 | config APPLDATA_MEM | |
430 | tristate "Monitor memory management statistics" | |
62fb2ba3 | 431 | depends on APPLDATA_BASE && VM_EVENT_COUNTERS |
1da177e4 LT |
432 | help |
433 | This provides memory management related data to the Linux - VM Monitor | |
434 | Stream, like paging/swapping rate, memory utilisation, etc. | |
435 | Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM | |
436 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
437 | on the z/VM side. | |
438 | ||
439 | Default is disabled. | |
440 | The /proc entry can also be read from, showing the current settings. | |
441 | ||
442 | This can also be compiled as a module, which will be called | |
443 | appldata_mem.o. | |
444 | ||
445 | config APPLDATA_OS | |
446 | tristate "Monitor OS statistics" | |
447 | depends on APPLDATA_BASE | |
448 | help | |
449 | This provides OS related data to the Linux - VM Monitor Stream, like | |
450 | CPU utilisation, etc. | |
451 | Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM | |
452 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
453 | on the z/VM side. | |
454 | ||
455 | Default is disabled. | |
456 | This can also be compiled as a module, which will be called | |
457 | appldata_os.o. | |
458 | ||
459 | config APPLDATA_NET_SUM | |
460 | tristate "Monitor overall network statistics" | |
461 | depends on APPLDATA_BASE | |
462 | help | |
463 | This provides network related data to the Linux - VM Monitor Stream, | |
464 | currently there is only a total sum of network I/O statistics, no | |
465 | per-interface data. | |
466 | Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM | |
467 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
468 | on the z/VM side. | |
469 | ||
470 | Default is disabled. | |
471 | This can also be compiled as a module, which will be called | |
472 | appldata_net_sum.o. | |
473 | ||
474 | config NO_IDLE_HZ | |
475 | bool "No HZ timer ticks in idle" | |
476 | help | |
477 | Switches the regular HZ timer off when the system is going idle. | |
478 | This helps z/VM to detect that the Linux system is idle. VM can | |
479 | then "swap-out" this guest which reduces memory usage. It also | |
480 | reduces the overhead of idle systems. | |
481 | ||
482 | The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer. | |
483 | hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ | |
484 | timer is active. | |
485 | ||
486 | config NO_IDLE_HZ_INIT | |
487 | bool "HZ timer in idle off by default" | |
488 | depends on NO_IDLE_HZ | |
489 | help | |
490 | The HZ timer is switched off in idle by default. That means the | |
491 | HZ timer is already disabled at boot time. | |
492 | ||
24bbb1fa MH |
493 | config S390_HYPFS_FS |
494 | bool "s390 hypervisor file system support" | |
495 | select SYS_HYPERVISOR | |
496 | default y | |
497 | help | |
498 | This is a virtual file system intended to provide accounting | |
499 | information in an s390 hypervisor environment. | |
500 | ||
cf13f0ea | 501 | config KEXEC |
07d43ce6 | 502 | bool "kexec system call" |
cf13f0ea HC |
503 | help |
504 | kexec is a system call that implements the ability to shutdown your | |
505 | current kernel, and to start another kernel. It is like a reboot | |
506 | but is independent of hardware/microcode support. | |
507 | ||
1da177e4 LT |
508 | endmenu |
509 | ||
d5950b43 SR |
510 | source "net/Kconfig" |
511 | ||
1da177e4 LT |
512 | config PCMCIA |
513 | bool | |
514 | default n | |
515 | ||
516 | source "drivers/base/Kconfig" | |
517 | ||
61d3ad0e MS |
518 | source "drivers/connector/Kconfig" |
519 | ||
1da177e4 LT |
520 | source "drivers/scsi/Kconfig" |
521 | ||
522 | source "drivers/s390/Kconfig" | |
523 | ||
d5950b43 | 524 | source "drivers/net/Kconfig" |
1da177e4 LT |
525 | |
526 | source "fs/Kconfig" | |
527 | ||
4ba069b8 MG |
528 | menu "Instrumentation Support" |
529 | ||
1da177e4 LT |
530 | source "arch/s390/oprofile/Kconfig" |
531 | ||
4ba069b8 MG |
532 | config KPROBES |
533 | bool "Kprobes (EXPERIMENTAL)" | |
534 | depends on EXPERIMENTAL && MODULES | |
535 | help | |
536 | Kprobes allows you to trap at almost any kernel address and | |
537 | execute a callback function. register_kprobe() establishes | |
538 | a probepoint and specifies the callback. Kprobes is useful | |
539 | for kernel debugging, non-intrusive instrumentation and testing. | |
540 | If in doubt, say "N". | |
541 | ||
542 | endmenu | |
543 | ||
1da177e4 LT |
544 | source "arch/s390/Kconfig.debug" |
545 | ||
546 | source "security/Kconfig" | |
547 | ||
548 | source "crypto/Kconfig" | |
549 | ||
550 | source "lib/Kconfig" |