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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 | ||
402b0862 CO |
65 | config PGSTE |
66 | bool | |
67 | default y if KVM | |
68 | ||
1da177e4 LT |
69 | mainmenu "Linux Kernel Configuration" |
70 | ||
347a8dc3 | 71 | config S390 |
61d48c2c | 72 | def_bool y |
42d4b839 | 73 | select HAVE_OPROFILE |
3f550096 | 74 | select HAVE_KPROBES |
9edddaa2 | 75 | select HAVE_KRETPROBES |
77b455f1 | 76 | select HAVE_KVM if 64BIT |
1da177e4 | 77 | |
1da177e4 LT |
78 | source "init/Kconfig" |
79 | ||
80 | menu "Base setup" | |
81 | ||
82 | comment "Processor type and features" | |
83 | ||
5a62b192 HC |
84 | source "kernel/time/Kconfig" |
85 | ||
347a8dc3 | 86 | config 64BIT |
1da177e4 LT |
87 | bool "64 bit kernel" |
88 | help | |
89 | Select this option if you have a 64 bit IBM zSeries machine | |
90 | and want to use the 64 bit addressing mode. | |
91 | ||
d9f7a745 MS |
92 | config 32BIT |
93 | bool | |
94 | default y if !64BIT | |
95 | ||
1da177e4 LT |
96 | config SMP |
97 | bool "Symmetric multi-processing support" | |
98 | ---help--- | |
99 | This enables support for systems with more than one CPU. If you have | |
100 | a system with only one CPU, like most personal computers, say N. If | |
101 | you have a system with more than one CPU, say Y. | |
102 | ||
103 | If you say N here, the kernel will run on single and multiprocessor | |
104 | machines, but will use only one CPU of a multiprocessor machine. If | |
105 | you say Y here, the kernel will run on many, but not all, | |
106 | singleprocessor machines. On a singleprocessor machine, the kernel | |
107 | will run faster if you say N here. | |
108 | ||
03502faa AB |
109 | See also the SMP-HOWTO available at |
110 | <http://www.tldp.org/docs.html#howto>. | |
1da177e4 LT |
111 | |
112 | Even if you don't know what to do here, say Y. | |
113 | ||
114 | config NR_CPUS | |
115 | int "Maximum number of CPUs (2-64)" | |
116 | range 2 64 | |
117 | depends on SMP | |
057c5cb3 HC |
118 | default "32" if !64BIT |
119 | default "64" if 64BIT | |
1da177e4 LT |
120 | help |
121 | This allows you to specify the maximum number of CPUs which this | |
122 | kernel will support. The maximum supported value is 64 and the | |
123 | minimum value which makes sense is 2. | |
124 | ||
125 | This is purely to save memory - each supported CPU adds | |
126 | approximately sixteen kilobytes to the kernel image. | |
127 | ||
128 | config HOTPLUG_CPU | |
129 | bool "Support for hot-pluggable CPUs" | |
130 | depends on SMP | |
131 | select HOTPLUG | |
132 | default n | |
133 | help | |
134 | Say Y here to be able to turn CPUs off and on. CPUs | |
135 | can be controlled through /sys/devices/system/cpu/cpu#. | |
136 | Say N if you want to disable CPU hotplug. | |
137 | ||
138 | config MATHEMU | |
139 | bool "IEEE FPU emulation" | |
140 | depends on MARCH_G5 | |
141 | help | |
142 | This option is required for IEEE compliant floating point arithmetic | |
143 | on older S/390 machines. Say Y unless you know your machine doesn't | |
144 | need this. | |
145 | ||
347a8dc3 | 146 | config COMPAT |
1da177e4 | 147 | bool "Kernel support for 31 bit emulation" |
347a8dc3 | 148 | depends on 64BIT |
1da177e4 LT |
149 | help |
150 | Select this option if you want to enable your system kernel to | |
151 | handle system-calls from ELF binaries for 31 bit ESA. This option | |
152 | (and some other stuff like libraries and such) is needed for | |
153 | executing 31 bit applications. It is safe to say "Y". | |
154 | ||
1da177e4 LT |
155 | config SYSVIPC_COMPAT |
156 | bool | |
157 | depends on COMPAT && SYSVIPC | |
158 | default y | |
159 | ||
e65e1fc2 AV |
160 | config AUDIT_ARCH |
161 | bool | |
162 | default y | |
163 | ||
c1821c2e GS |
164 | config S390_SWITCH_AMODE |
165 | bool "Switch kernel/user addressing modes" | |
166 | help | |
167 | This option allows to switch the addressing modes of kernel and user | |
168 | space. The kernel parameter switch_amode=on will enable this feature, | |
169 | default is disabled. Enabling this (via kernel parameter) on machines | |
170 | earlier than IBM System z9-109 EC/BC will reduce system performance. | |
171 | ||
172 | Note that this option will also be selected by selecting the execute | |
173 | protection option below. Enabling the execute protection via the | |
174 | noexec kernel parameter will also switch the addressing modes, | |
175 | independent of the switch_amode kernel parameter. | |
176 | ||
177 | ||
178 | config S390_EXEC_PROTECT | |
179 | bool "Data execute protection" | |
180 | select S390_SWITCH_AMODE | |
181 | help | |
182 | This option allows to enable a buffer overflow protection for user | |
183 | space programs and it also selects the addressing mode option above. | |
184 | The kernel parameter noexec=on will enable this feature and also | |
185 | switch the addressing modes, default is disabled. Enabling this (via | |
186 | kernel parameter) on machines earlier than IBM System z9-109 EC/BC | |
187 | will reduce system performance. | |
188 | ||
1da177e4 LT |
189 | comment "Code generation options" |
190 | ||
191 | choice | |
192 | prompt "Processor type" | |
193 | default MARCH_G5 | |
194 | ||
195 | config MARCH_G5 | |
196 | bool "S/390 model G5 and G6" | |
347a8dc3 | 197 | depends on !64BIT |
1da177e4 LT |
198 | help |
199 | Select this to build a 31 bit kernel that works | |
200 | on all S/390 and zSeries machines. | |
201 | ||
202 | config MARCH_Z900 | |
203 | bool "IBM eServer zSeries model z800 and z900" | |
204 | help | |
205 | Select this to optimize for zSeries machines. This | |
206 | will enable some optimizations that are not available | |
207 | on older 31 bit only CPUs. | |
208 | ||
209 | config MARCH_Z990 | |
210 | bool "IBM eServer zSeries model z890 and z990" | |
211 | help | |
212 | Select this enable optimizations for model z890/z990. | |
213 | This will be slightly faster but does not work on | |
214 | older machines such as the z900. | |
215 | ||
0efa4703 CB |
216 | config MARCH_Z9_109 |
217 | bool "IBM System z9" | |
218 | help | |
219 | Select this to enable optimizations for IBM System z9-109, IBM | |
220 | System z9 Enterprise Class (z9 EC), and IBM System z9 Business | |
221 | Class (z9 BC). The kernel will be slightly faster but will not | |
222 | work on older machines such as the z990, z890, z900, and z800. | |
223 | ||
1da177e4 LT |
224 | endchoice |
225 | ||
226 | config PACK_STACK | |
227 | bool "Pack kernel stack" | |
228 | help | |
229 | This option enables the compiler option -mkernel-backchain if it | |
230 | is available. If the option is available the compiler supports | |
231 | the new stack layout which dramatically reduces the minimum stack | |
232 | frame size. With an old compiler a non-leaf function needs a | |
233 | minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With | |
234 | -mkernel-backchain the minimum size drops to 16 byte on 31 bit | |
235 | and 24 byte on 64 bit. | |
236 | ||
237 | Say Y if you are unsure. | |
238 | ||
239 | config SMALL_STACK | |
240 | bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb" | |
74f8f557 | 241 | depends on PACK_STACK && !LOCKDEP |
1da177e4 LT |
242 | help |
243 | If you say Y here and the compiler supports the -mkernel-backchain | |
244 | option the kernel will use a smaller kernel stack size. For 31 bit | |
245 | the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb | |
246 | instead of 16kb. This allows to run more thread on a system and | |
247 | reduces the pressure on the memory management for higher order | |
248 | page allocations. | |
249 | ||
250 | Say N if you are unsure. | |
251 | ||
252 | ||
253 | config CHECK_STACK | |
254 | bool "Detect kernel stack overflow" | |
255 | help | |
256 | This option enables the compiler option -mstack-guard and | |
257 | -mstack-size if they are available. If the compiler supports them | |
258 | it will emit additional code to each function prolog to trigger | |
259 | an illegal operation if the kernel stack is about to overflow. | |
260 | ||
261 | Say N if you are unsure. | |
262 | ||
263 | config STACK_GUARD | |
264 | int "Size of the guard area (128-1024)" | |
265 | range 128 1024 | |
266 | depends on CHECK_STACK | |
267 | default "256" | |
268 | help | |
269 | This allows you to specify the size of the guard area at the lower | |
270 | end of the kernel stack. If the kernel stack points into the guard | |
271 | area on function entry an illegal operation is triggered. The size | |
272 | needs to be a power of 2. Please keep in mind that the size of an | |
273 | interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. | |
274 | The minimum size for the stack guard should be 256 for 31 bit and | |
275 | 512 for 64 bit. | |
276 | ||
277 | config WARN_STACK | |
278 | bool "Emit compiler warnings for function with broken stack usage" | |
279 | help | |
280 | This option enables the compiler options -mwarn-framesize and | |
281 | -mwarn-dynamicstack. If the compiler supports these options it | |
282 | will generate warnings for function which either use alloca or | |
283 | create a stack frame bigger then CONFIG_WARN_STACK_SIZE. | |
284 | ||
285 | Say N if you are unsure. | |
286 | ||
287 | config WARN_STACK_SIZE | |
288 | int "Maximum frame size considered safe (128-2048)" | |
289 | range 128 2048 | |
290 | depends on WARN_STACK | |
291 | default "256" | |
292 | help | |
293 | This allows you to specify the maximum frame size a function may | |
294 | have without the compiler complaining about it. | |
295 | ||
39b742f9 HC |
296 | config ARCH_POPULATES_NODE_MAP |
297 | def_bool y | |
298 | ||
61d48c2c MS |
299 | comment "Kernel preemption" |
300 | ||
301 | source "kernel/Kconfig.preempt" | |
302 | ||
17f34580 HC |
303 | config ARCH_SPARSEMEM_ENABLE |
304 | def_bool y | |
305 | select SPARSEMEM_VMEMMAP_ENABLE | |
306 | select SPARSEMEM_VMEMMAP | |
148f1678 | 307 | select SPARSEMEM_STATIC if !64BIT |
17f34580 HC |
308 | |
309 | config ARCH_SPARSEMEM_DEFAULT | |
310 | def_bool y | |
311 | ||
97195d6b HJP |
312 | config ARCH_SELECT_MEMORY_MODEL |
313 | def_bool y | |
314 | ||
3f22ab27 DH |
315 | source "mm/Kconfig" |
316 | ||
1da177e4 LT |
317 | comment "I/O subsystem configuration" |
318 | ||
319 | config MACHCHK_WARNING | |
320 | bool "Process warning machine checks" | |
321 | help | |
322 | Select this option if you want the machine check handler on IBM S/390 or | |
323 | zSeries to process warning machine checks (e.g. on power failures). | |
324 | If unsure, say "Y". | |
325 | ||
326 | config QDIO | |
327 | tristate "QDIO support" | |
328 | ---help--- | |
8129ee16 | 329 | This driver provides the Queued Direct I/O base support for |
efca13bc | 330 | IBM System z. |
1da177e4 LT |
331 | |
332 | To compile this driver as a module, choose M here: the | |
333 | module will be called qdio. | |
334 | ||
335 | If unsure, say Y. | |
336 | ||
1da177e4 LT |
337 | config QDIO_DEBUG |
338 | bool "Extended debugging information" | |
339 | depends on QDIO | |
340 | help | |
8129ee16 FP |
341 | Say Y here to get extended debugging output in |
342 | /sys/kernel/debug/s390dbf/qdio... | |
1da177e4 LT |
343 | Warning: this option reduces the performance of the QDIO module. |
344 | ||
345 | If unsure, say N. | |
346 | ||
347 | comment "Misc" | |
348 | ||
1da177e4 LT |
349 | config IPL |
350 | bool "Builtin IPL record support" | |
351 | help | |
352 | If you want to use the produced kernel to IPL directly from a | |
353 | device, you have to merge a bootsector specific to the device | |
354 | into the first bytes of the kernel. You will have to select the | |
355 | IPL device. | |
356 | ||
357 | choice | |
358 | prompt "IPL method generated into head.S" | |
359 | depends on IPL | |
360 | default IPL_TAPE | |
361 | help | |
362 | Select "tape" if you want to IPL the image from a Tape. | |
363 | ||
364 | Select "vm_reader" if you are running under VM/ESA and want | |
365 | to IPL the image from the emulated card reader. | |
366 | ||
367 | config IPL_TAPE | |
368 | bool "tape" | |
369 | ||
370 | config IPL_VM | |
371 | bool "vm_reader" | |
372 | ||
373 | endchoice | |
374 | ||
375 | source "fs/Kconfig.binfmt" | |
376 | ||
684de39b HC |
377 | config FORCE_MAX_ZONEORDER |
378 | int | |
379 | default "9" | |
380 | ||
1da177e4 LT |
381 | config PROCESS_DEBUG |
382 | bool "Show crashed user process info" | |
383 | help | |
384 | Say Y to print all process fault locations to the console. This is | |
385 | a debugging option; you probably do not want to set it unless you | |
386 | are an S390 port maintainer. | |
387 | ||
388 | config PFAULT | |
389 | bool "Pseudo page fault support" | |
390 | help | |
391 | Select this option, if you want to use PFAULT pseudo page fault | |
392 | handling under VM. If running native or in LPAR, this option | |
393 | has no effect. If your VM does not support PFAULT, PAGEEX | |
394 | pseudo page fault handling will be used. | |
395 | Note that VM 4.2 supports PFAULT but has a bug in its | |
396 | implementation that causes some problems. | |
397 | Everybody who wants to run Linux under VM != VM4.2 should select | |
398 | this option. | |
399 | ||
400 | config SHARED_KERNEL | |
401 | bool "VM shared kernel support" | |
402 | help | |
403 | Select this option, if you want to share the text segment of the | |
404 | Linux kernel between different VM guests. This reduces memory | |
405 | usage with lots of guests but greatly increases kernel size. | |
9c9c1761 HC |
406 | Also if a kernel was IPL'ed from a shared segment the kexec system |
407 | call will not work. | |
1da177e4 LT |
408 | You should only select this option if you know what you are |
409 | doing and want to exploit this feature. | |
410 | ||
411 | config CMM | |
412 | tristate "Cooperative memory management" | |
413 | help | |
414 | Select this option, if you want to enable the kernel interface | |
415 | to reduce the memory size of the system. This is accomplished | |
416 | by allocating pages of memory and put them "on hold". This only | |
417 | makes sense for a system running under VM where the unused pages | |
418 | will be reused by VM for other guest systems. The interface | |
419 | allows an external monitor to balance memory of many systems. | |
420 | Everybody who wants to run Linux under VM should select this | |
421 | option. | |
422 | ||
423 | config CMM_PROC | |
424 | bool "/proc interface to cooperative memory management" | |
425 | depends on CMM | |
426 | help | |
427 | Select this option to enable the /proc interface to the | |
428 | cooperative memory management. | |
429 | ||
430 | config CMM_IUCV | |
431 | bool "IUCV special message interface to cooperative memory management" | |
432 | depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) | |
433 | help | |
434 | Select this option to enable the special message interface to | |
435 | the cooperative memory management. | |
436 | ||
45e576b1 MS |
437 | config PAGE_STATES |
438 | bool "Unused page notification" | |
439 | help | |
440 | This enables the notification of unused pages to the | |
441 | hypervisor. The ESSA instruction is used to do the states | |
442 | changes between a page that has content and the unused state. | |
443 | ||
1da177e4 LT |
444 | config VIRT_TIMER |
445 | bool "Virtual CPU timer support" | |
446 | help | |
447 | This provides a kernel interface for virtual CPU timers. | |
448 | Default is disabled. | |
449 | ||
450 | config VIRT_CPU_ACCOUNTING | |
451 | bool "Base user process accounting on virtual cpu timer" | |
452 | depends on VIRT_TIMER | |
453 | help | |
454 | Select this option to use CPU timer deltas to do user | |
455 | process accounting. | |
456 | ||
457 | config APPLDATA_BASE | |
458 | bool "Linux - VM Monitor Stream, base infrastructure" | |
459 | depends on PROC_FS && VIRT_TIMER=y | |
460 | help | |
461 | This provides a kernel interface for creating and updating z/VM APPLDATA | |
462 | monitor records. The monitor records are updated at certain time | |
463 | intervals, once the timer is started. | |
464 | Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, | |
465 | i.e. enables or disables monitoring on the Linux side. | |
466 | A custom interval value (in seconds) can be written to | |
467 | /proc/appldata/interval. | |
468 | ||
469 | Defaults are 60 seconds interval and timer off. | |
470 | The /proc entries can also be read from, showing the current settings. | |
471 | ||
472 | config APPLDATA_MEM | |
473 | tristate "Monitor memory management statistics" | |
62fb2ba3 | 474 | depends on APPLDATA_BASE && VM_EVENT_COUNTERS |
1da177e4 LT |
475 | help |
476 | This provides memory management related data to the Linux - VM Monitor | |
477 | Stream, like paging/swapping rate, memory utilisation, etc. | |
478 | Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM | |
479 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
480 | on the z/VM side. | |
481 | ||
482 | Default is disabled. | |
483 | The /proc entry can also be read from, showing the current settings. | |
484 | ||
485 | This can also be compiled as a module, which will be called | |
486 | appldata_mem.o. | |
487 | ||
488 | config APPLDATA_OS | |
489 | tristate "Monitor OS statistics" | |
490 | depends on APPLDATA_BASE | |
491 | help | |
492 | This provides OS related data to the Linux - VM Monitor Stream, like | |
493 | CPU utilisation, etc. | |
494 | Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM | |
495 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
496 | on the z/VM side. | |
497 | ||
498 | Default is disabled. | |
499 | This can also be compiled as a module, which will be called | |
500 | appldata_os.o. | |
501 | ||
502 | config APPLDATA_NET_SUM | |
503 | tristate "Monitor overall network statistics" | |
504 | depends on APPLDATA_BASE | |
505 | help | |
506 | This provides network related data to the Linux - VM Monitor Stream, | |
507 | currently there is only a total sum of network I/O statistics, no | |
508 | per-interface data. | |
509 | Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM | |
510 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
511 | on the z/VM side. | |
512 | ||
513 | Default is disabled. | |
514 | This can also be compiled as a module, which will be called | |
515 | appldata_net_sum.o. | |
516 | ||
61d48c2c MS |
517 | source kernel/Kconfig.hz |
518 | ||
24bbb1fa MH |
519 | config S390_HYPFS_FS |
520 | bool "s390 hypervisor file system support" | |
521 | select SYS_HYPERVISOR | |
522 | default y | |
523 | help | |
524 | This is a virtual file system intended to provide accounting | |
525 | information in an s390 hypervisor environment. | |
526 | ||
cf13f0ea | 527 | config KEXEC |
07d43ce6 | 528 | bool "kexec system call" |
cf13f0ea HC |
529 | help |
530 | kexec is a system call that implements the ability to shutdown your | |
531 | current kernel, and to start another kernel. It is like a reboot | |
532 | but is independent of hardware/microcode support. | |
533 | ||
411ed322 MH |
534 | config ZFCPDUMP |
535 | tristate "zfcpdump support" | |
536 | select SMP | |
537 | default n | |
538 | help | |
539 | Select this option if you want to build an zfcpdump enabled kernel. | |
e403149c | 540 | Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this. |
411ed322 | 541 | |
fa587743 CO |
542 | config S390_GUEST |
543 | bool "s390 guest support (EXPERIMENTAL)" | |
544 | depends on 64BIT && EXPERIMENTAL | |
545 | select VIRTIO | |
546 | select VIRTIO_RING | |
547 | help | |
548 | Select this option if you want to run the kernel under s390 linux | |
1da177e4 LT |
549 | endmenu |
550 | ||
d5950b43 SR |
551 | source "net/Kconfig" |
552 | ||
1da177e4 | 553 | config PCMCIA |
61d48c2c | 554 | def_bool n |
1da177e4 | 555 | |
61d48c2c MS |
556 | config CCW |
557 | def_bool y | |
1da177e4 | 558 | |
61d48c2c | 559 | source "drivers/Kconfig" |
1da177e4 LT |
560 | |
561 | source "fs/Kconfig" | |
562 | ||
1da177e4 LT |
563 | source "arch/s390/Kconfig.debug" |
564 | ||
565 | source "security/Kconfig" | |
566 | ||
567 | source "crypto/Kconfig" | |
568 | ||
569 | source "lib/Kconfig" | |
77b455f1 CB |
570 | |
571 | source "arch/s390/kvm/Kconfig" |