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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 | ||
23db764d | 44 | config NO_IOMEM |
5ea81769 AV |
45 | def_bool y |
46 | ||
1da177e4 LT |
47 | mainmenu "Linux Kernel Configuration" |
48 | ||
347a8dc3 | 49 | config S390 |
1da177e4 LT |
50 | bool |
51 | default y | |
52 | ||
1da177e4 LT |
53 | source "init/Kconfig" |
54 | ||
55 | menu "Base setup" | |
56 | ||
57 | comment "Processor type and features" | |
58 | ||
347a8dc3 | 59 | config 64BIT |
1da177e4 LT |
60 | bool "64 bit kernel" |
61 | help | |
62 | Select this option if you have a 64 bit IBM zSeries machine | |
63 | and want to use the 64 bit addressing mode. | |
64 | ||
d9f7a745 MS |
65 | config 32BIT |
66 | bool | |
67 | default y if !64BIT | |
68 | ||
1da177e4 LT |
69 | config SMP |
70 | bool "Symmetric multi-processing support" | |
71 | ---help--- | |
72 | This enables support for systems with more than one CPU. If you have | |
73 | a system with only one CPU, like most personal computers, say N. If | |
74 | you have a system with more than one CPU, say Y. | |
75 | ||
76 | If you say N here, the kernel will run on single and multiprocessor | |
77 | machines, but will use only one CPU of a multiprocessor machine. If | |
78 | you say Y here, the kernel will run on many, but not all, | |
79 | singleprocessor machines. On a singleprocessor machine, the kernel | |
80 | will run faster if you say N here. | |
81 | ||
82 | See also the <file:Documentation/smp.txt> and the SMP-HOWTO | |
83 | available at <http://www.tldp.org/docs.html#howto>. | |
84 | ||
85 | Even if you don't know what to do here, say Y. | |
86 | ||
87 | config NR_CPUS | |
88 | int "Maximum number of CPUs (2-64)" | |
89 | range 2 64 | |
90 | depends on SMP | |
91 | default "32" | |
92 | help | |
93 | This allows you to specify the maximum number of CPUs which this | |
94 | kernel will support. The maximum supported value is 64 and the | |
95 | minimum value which makes sense is 2. | |
96 | ||
97 | This is purely to save memory - each supported CPU adds | |
98 | approximately sixteen kilobytes to the kernel image. | |
99 | ||
100 | config HOTPLUG_CPU | |
101 | bool "Support for hot-pluggable CPUs" | |
102 | depends on SMP | |
103 | select HOTPLUG | |
104 | default n | |
105 | help | |
106 | Say Y here to be able to turn CPUs off and on. CPUs | |
107 | can be controlled through /sys/devices/system/cpu/cpu#. | |
108 | Say N if you want to disable CPU hotplug. | |
109 | ||
4bbf39c2 IM |
110 | config DEFAULT_MIGRATION_COST |
111 | int | |
112 | default "1000000" | |
113 | ||
1da177e4 LT |
114 | config MATHEMU |
115 | bool "IEEE FPU emulation" | |
116 | depends on MARCH_G5 | |
117 | help | |
118 | This option is required for IEEE compliant floating point arithmetic | |
119 | on older S/390 machines. Say Y unless you know your machine doesn't | |
120 | need this. | |
121 | ||
347a8dc3 | 122 | config COMPAT |
1da177e4 | 123 | bool "Kernel support for 31 bit emulation" |
347a8dc3 | 124 | depends on 64BIT |
1da177e4 LT |
125 | help |
126 | Select this option if you want to enable your system kernel to | |
127 | handle system-calls from ELF binaries for 31 bit ESA. This option | |
128 | (and some other stuff like libraries and such) is needed for | |
129 | executing 31 bit applications. It is safe to say "Y". | |
130 | ||
1da177e4 LT |
131 | config SYSVIPC_COMPAT |
132 | bool | |
133 | depends on COMPAT && SYSVIPC | |
134 | default y | |
135 | ||
e65e1fc2 AV |
136 | config AUDIT_ARCH |
137 | bool | |
138 | default y | |
139 | ||
c1821c2e GS |
140 | config S390_SWITCH_AMODE |
141 | bool "Switch kernel/user addressing modes" | |
142 | help | |
143 | This option allows to switch the addressing modes of kernel and user | |
144 | space. The kernel parameter switch_amode=on will enable this feature, | |
145 | default is disabled. Enabling this (via kernel parameter) on machines | |
146 | earlier than IBM System z9-109 EC/BC will reduce system performance. | |
147 | ||
148 | Note that this option will also be selected by selecting the execute | |
149 | protection option below. Enabling the execute protection via the | |
150 | noexec kernel parameter will also switch the addressing modes, | |
151 | independent of the switch_amode kernel parameter. | |
152 | ||
153 | ||
154 | config S390_EXEC_PROTECT | |
155 | bool "Data execute protection" | |
156 | select S390_SWITCH_AMODE | |
157 | help | |
158 | This option allows to enable a buffer overflow protection for user | |
159 | space programs and it also selects the addressing mode option above. | |
160 | The kernel parameter noexec=on will enable this feature and also | |
161 | switch the addressing modes, default is disabled. Enabling this (via | |
162 | kernel parameter) on machines earlier than IBM System z9-109 EC/BC | |
163 | will reduce system performance. | |
164 | ||
1da177e4 LT |
165 | comment "Code generation options" |
166 | ||
167 | choice | |
168 | prompt "Processor type" | |
169 | default MARCH_G5 | |
170 | ||
171 | config MARCH_G5 | |
172 | bool "S/390 model G5 and G6" | |
347a8dc3 | 173 | depends on !64BIT |
1da177e4 LT |
174 | help |
175 | Select this to build a 31 bit kernel that works | |
176 | on all S/390 and zSeries machines. | |
177 | ||
178 | config MARCH_Z900 | |
179 | bool "IBM eServer zSeries model z800 and z900" | |
180 | help | |
181 | Select this to optimize for zSeries machines. This | |
182 | will enable some optimizations that are not available | |
183 | on older 31 bit only CPUs. | |
184 | ||
185 | config MARCH_Z990 | |
186 | bool "IBM eServer zSeries model z890 and z990" | |
187 | help | |
188 | Select this enable optimizations for model z890/z990. | |
189 | This will be slightly faster but does not work on | |
190 | older machines such as the z900. | |
191 | ||
0efa4703 CB |
192 | config MARCH_Z9_109 |
193 | bool "IBM System z9" | |
194 | help | |
195 | Select this to enable optimizations for IBM System z9-109, IBM | |
196 | System z9 Enterprise Class (z9 EC), and IBM System z9 Business | |
197 | Class (z9 BC). The kernel will be slightly faster but will not | |
198 | work on older machines such as the z990, z890, z900, and z800. | |
199 | ||
1da177e4 LT |
200 | endchoice |
201 | ||
202 | config PACK_STACK | |
203 | bool "Pack kernel stack" | |
204 | help | |
205 | This option enables the compiler option -mkernel-backchain if it | |
206 | is available. If the option is available the compiler supports | |
207 | the new stack layout which dramatically reduces the minimum stack | |
208 | frame size. With an old compiler a non-leaf function needs a | |
209 | minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With | |
210 | -mkernel-backchain the minimum size drops to 16 byte on 31 bit | |
211 | and 24 byte on 64 bit. | |
212 | ||
213 | Say Y if you are unsure. | |
214 | ||
215 | config SMALL_STACK | |
216 | bool "Use 4kb/8kb for kernel stack instead of 8kb/16kb" | |
74f8f557 | 217 | depends on PACK_STACK && !LOCKDEP |
1da177e4 LT |
218 | help |
219 | If you say Y here and the compiler supports the -mkernel-backchain | |
220 | option the kernel will use a smaller kernel stack size. For 31 bit | |
221 | the reduced size is 4kb instead of 8kb and for 64 bit it is 8kb | |
222 | instead of 16kb. This allows to run more thread on a system and | |
223 | reduces the pressure on the memory management for higher order | |
224 | page allocations. | |
225 | ||
226 | Say N if you are unsure. | |
227 | ||
228 | ||
229 | config CHECK_STACK | |
230 | bool "Detect kernel stack overflow" | |
231 | help | |
232 | This option enables the compiler option -mstack-guard and | |
233 | -mstack-size if they are available. If the compiler supports them | |
234 | it will emit additional code to each function prolog to trigger | |
235 | an illegal operation if the kernel stack is about to overflow. | |
236 | ||
237 | Say N if you are unsure. | |
238 | ||
239 | config STACK_GUARD | |
240 | int "Size of the guard area (128-1024)" | |
241 | range 128 1024 | |
242 | depends on CHECK_STACK | |
243 | default "256" | |
244 | help | |
245 | This allows you to specify the size of the guard area at the lower | |
246 | end of the kernel stack. If the kernel stack points into the guard | |
247 | area on function entry an illegal operation is triggered. The size | |
248 | needs to be a power of 2. Please keep in mind that the size of an | |
249 | interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. | |
250 | The minimum size for the stack guard should be 256 for 31 bit and | |
251 | 512 for 64 bit. | |
252 | ||
253 | config WARN_STACK | |
254 | bool "Emit compiler warnings for function with broken stack usage" | |
255 | help | |
256 | This option enables the compiler options -mwarn-framesize and | |
257 | -mwarn-dynamicstack. If the compiler supports these options it | |
258 | will generate warnings for function which either use alloca or | |
259 | create a stack frame bigger then CONFIG_WARN_STACK_SIZE. | |
260 | ||
261 | Say N if you are unsure. | |
262 | ||
263 | config WARN_STACK_SIZE | |
264 | int "Maximum frame size considered safe (128-2048)" | |
265 | range 128 2048 | |
266 | depends on WARN_STACK | |
267 | default "256" | |
268 | help | |
269 | This allows you to specify the maximum frame size a function may | |
270 | have without the compiler complaining about it. | |
271 | ||
39b742f9 HC |
272 | config ARCH_POPULATES_NODE_MAP |
273 | def_bool y | |
274 | ||
3f22ab27 DH |
275 | source "mm/Kconfig" |
276 | ||
f4eb07c1 HC |
277 | config HOLES_IN_ZONE |
278 | def_bool y | |
279 | ||
1da177e4 LT |
280 | comment "I/O subsystem configuration" |
281 | ||
282 | config MACHCHK_WARNING | |
283 | bool "Process warning machine checks" | |
284 | help | |
285 | Select this option if you want the machine check handler on IBM S/390 or | |
286 | zSeries to process warning machine checks (e.g. on power failures). | |
287 | If unsure, say "Y". | |
288 | ||
289 | config QDIO | |
290 | tristate "QDIO support" | |
291 | ---help--- | |
8129ee16 FP |
292 | This driver provides the Queued Direct I/O base support for |
293 | IBM mainframes. | |
1da177e4 LT |
294 | |
295 | For details please refer to the documentation provided by IBM at | |
296 | <http://www10.software.ibm.com/developerworks/opensource/linux390> | |
297 | ||
298 | To compile this driver as a module, choose M here: the | |
299 | module will be called qdio. | |
300 | ||
301 | If unsure, say Y. | |
302 | ||
1da177e4 LT |
303 | config QDIO_DEBUG |
304 | bool "Extended debugging information" | |
305 | depends on QDIO | |
306 | help | |
8129ee16 FP |
307 | Say Y here to get extended debugging output in |
308 | /sys/kernel/debug/s390dbf/qdio... | |
1da177e4 LT |
309 | Warning: this option reduces the performance of the QDIO module. |
310 | ||
311 | If unsure, say N. | |
312 | ||
313 | comment "Misc" | |
314 | ||
315 | config PREEMPT | |
316 | bool "Preemptible Kernel" | |
317 | help | |
318 | This option reduces the latency of the kernel when reacting to | |
319 | real-time or interactive events by allowing a low priority process to | |
320 | be preempted even if it is in kernel mode executing a system call. | |
321 | This allows applications to run more reliably even when the system is | |
322 | under load. | |
323 | ||
324 | Say N if you are unsure. | |
325 | ||
326 | config IPL | |
327 | bool "Builtin IPL record support" | |
328 | help | |
329 | If you want to use the produced kernel to IPL directly from a | |
330 | device, you have to merge a bootsector specific to the device | |
331 | into the first bytes of the kernel. You will have to select the | |
332 | IPL device. | |
333 | ||
334 | choice | |
335 | prompt "IPL method generated into head.S" | |
336 | depends on IPL | |
337 | default IPL_TAPE | |
338 | help | |
339 | Select "tape" if you want to IPL the image from a Tape. | |
340 | ||
341 | Select "vm_reader" if you are running under VM/ESA and want | |
342 | to IPL the image from the emulated card reader. | |
343 | ||
344 | config IPL_TAPE | |
345 | bool "tape" | |
346 | ||
347 | config IPL_VM | |
348 | bool "vm_reader" | |
349 | ||
350 | endchoice | |
351 | ||
352 | source "fs/Kconfig.binfmt" | |
353 | ||
354 | config PROCESS_DEBUG | |
355 | bool "Show crashed user process info" | |
356 | help | |
357 | Say Y to print all process fault locations to the console. This is | |
358 | a debugging option; you probably do not want to set it unless you | |
359 | are an S390 port maintainer. | |
360 | ||
361 | config PFAULT | |
362 | bool "Pseudo page fault support" | |
363 | help | |
364 | Select this option, if you want to use PFAULT pseudo page fault | |
365 | handling under VM. If running native or in LPAR, this option | |
366 | has no effect. If your VM does not support PFAULT, PAGEEX | |
367 | pseudo page fault handling will be used. | |
368 | Note that VM 4.2 supports PFAULT but has a bug in its | |
369 | implementation that causes some problems. | |
370 | Everybody who wants to run Linux under VM != VM4.2 should select | |
371 | this option. | |
372 | ||
373 | config SHARED_KERNEL | |
374 | bool "VM shared kernel support" | |
375 | help | |
376 | Select this option, if you want to share the text segment of the | |
377 | Linux kernel between different VM guests. This reduces memory | |
378 | usage with lots of guests but greatly increases kernel size. | |
379 | You should only select this option if you know what you are | |
380 | doing and want to exploit this feature. | |
381 | ||
382 | config CMM | |
383 | tristate "Cooperative memory management" | |
384 | help | |
385 | Select this option, if you want to enable the kernel interface | |
386 | to reduce the memory size of the system. This is accomplished | |
387 | by allocating pages of memory and put them "on hold". This only | |
388 | makes sense for a system running under VM where the unused pages | |
389 | will be reused by VM for other guest systems. The interface | |
390 | allows an external monitor to balance memory of many systems. | |
391 | Everybody who wants to run Linux under VM should select this | |
392 | option. | |
393 | ||
394 | config CMM_PROC | |
395 | bool "/proc interface to cooperative memory management" | |
396 | depends on CMM | |
397 | help | |
398 | Select this option to enable the /proc interface to the | |
399 | cooperative memory management. | |
400 | ||
401 | config CMM_IUCV | |
402 | bool "IUCV special message interface to cooperative memory management" | |
403 | depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) | |
404 | help | |
405 | Select this option to enable the special message interface to | |
406 | the cooperative memory management. | |
407 | ||
408 | config VIRT_TIMER | |
409 | bool "Virtual CPU timer support" | |
410 | help | |
411 | This provides a kernel interface for virtual CPU timers. | |
412 | Default is disabled. | |
413 | ||
414 | config VIRT_CPU_ACCOUNTING | |
415 | bool "Base user process accounting on virtual cpu timer" | |
416 | depends on VIRT_TIMER | |
417 | help | |
418 | Select this option to use CPU timer deltas to do user | |
419 | process accounting. | |
420 | ||
421 | config APPLDATA_BASE | |
422 | bool "Linux - VM Monitor Stream, base infrastructure" | |
423 | depends on PROC_FS && VIRT_TIMER=y | |
424 | help | |
425 | This provides a kernel interface for creating and updating z/VM APPLDATA | |
426 | monitor records. The monitor records are updated at certain time | |
427 | intervals, once the timer is started. | |
428 | Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, | |
429 | i.e. enables or disables monitoring on the Linux side. | |
430 | A custom interval value (in seconds) can be written to | |
431 | /proc/appldata/interval. | |
432 | ||
433 | Defaults are 60 seconds interval and timer off. | |
434 | The /proc entries can also be read from, showing the current settings. | |
435 | ||
436 | config APPLDATA_MEM | |
437 | tristate "Monitor memory management statistics" | |
62fb2ba3 | 438 | depends on APPLDATA_BASE && VM_EVENT_COUNTERS |
1da177e4 LT |
439 | help |
440 | This provides memory management related data to the Linux - VM Monitor | |
441 | Stream, like paging/swapping rate, memory utilisation, etc. | |
442 | Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM | |
443 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
444 | on the z/VM side. | |
445 | ||
446 | Default is disabled. | |
447 | The /proc entry can also be read from, showing the current settings. | |
448 | ||
449 | This can also be compiled as a module, which will be called | |
450 | appldata_mem.o. | |
451 | ||
452 | config APPLDATA_OS | |
453 | tristate "Monitor OS statistics" | |
454 | depends on APPLDATA_BASE | |
455 | help | |
456 | This provides OS related data to the Linux - VM Monitor Stream, like | |
457 | CPU utilisation, etc. | |
458 | Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM | |
459 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
460 | on the z/VM side. | |
461 | ||
462 | Default is disabled. | |
463 | This can also be compiled as a module, which will be called | |
464 | appldata_os.o. | |
465 | ||
466 | config APPLDATA_NET_SUM | |
467 | tristate "Monitor overall network statistics" | |
468 | depends on APPLDATA_BASE | |
469 | help | |
470 | This provides network related data to the Linux - VM Monitor Stream, | |
471 | currently there is only a total sum of network I/O statistics, no | |
472 | per-interface data. | |
473 | Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM | |
474 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
475 | on the z/VM side. | |
476 | ||
477 | Default is disabled. | |
478 | This can also be compiled as a module, which will be called | |
479 | appldata_net_sum.o. | |
480 | ||
481 | config NO_IDLE_HZ | |
482 | bool "No HZ timer ticks in idle" | |
483 | help | |
484 | Switches the regular HZ timer off when the system is going idle. | |
485 | This helps z/VM to detect that the Linux system is idle. VM can | |
486 | then "swap-out" this guest which reduces memory usage. It also | |
487 | reduces the overhead of idle systems. | |
488 | ||
489 | The HZ timer can be switched on/off via /proc/sys/kernel/hz_timer. | |
490 | hz_timer=0 means HZ timer is disabled. hz_timer=1 means HZ | |
491 | timer is active. | |
492 | ||
493 | config NO_IDLE_HZ_INIT | |
494 | bool "HZ timer in idle off by default" | |
495 | depends on NO_IDLE_HZ | |
496 | help | |
497 | The HZ timer is switched off in idle by default. That means the | |
498 | HZ timer is already disabled at boot time. | |
499 | ||
24bbb1fa MH |
500 | config S390_HYPFS_FS |
501 | bool "s390 hypervisor file system support" | |
502 | select SYS_HYPERVISOR | |
503 | default y | |
504 | help | |
505 | This is a virtual file system intended to provide accounting | |
506 | information in an s390 hypervisor environment. | |
507 | ||
cf13f0ea | 508 | config KEXEC |
07d43ce6 | 509 | bool "kexec system call" |
cf13f0ea HC |
510 | help |
511 | kexec is a system call that implements the ability to shutdown your | |
512 | current kernel, and to start another kernel. It is like a reboot | |
513 | but is independent of hardware/microcode support. | |
514 | ||
1da177e4 LT |
515 | endmenu |
516 | ||
d5950b43 SR |
517 | source "net/Kconfig" |
518 | ||
1da177e4 LT |
519 | config PCMCIA |
520 | bool | |
521 | default n | |
522 | ||
523 | source "drivers/base/Kconfig" | |
524 | ||
61d3ad0e MS |
525 | source "drivers/connector/Kconfig" |
526 | ||
1da177e4 LT |
527 | source "drivers/scsi/Kconfig" |
528 | ||
529 | source "drivers/s390/Kconfig" | |
530 | ||
d5950b43 | 531 | source "drivers/net/Kconfig" |
1da177e4 LT |
532 | |
533 | source "fs/Kconfig" | |
534 | ||
4ba069b8 MG |
535 | menu "Instrumentation Support" |
536 | ||
1da177e4 LT |
537 | source "arch/s390/oprofile/Kconfig" |
538 | ||
4ba069b8 MG |
539 | config KPROBES |
540 | bool "Kprobes (EXPERIMENTAL)" | |
541 | depends on EXPERIMENTAL && MODULES | |
542 | help | |
543 | Kprobes allows you to trap at almost any kernel address and | |
544 | execute a callback function. register_kprobe() establishes | |
545 | a probepoint and specifies the callback. Kprobes is useful | |
546 | for kernel debugging, non-intrusive instrumentation and testing. | |
547 | If in doubt, say "N". | |
548 | ||
549 | endmenu | |
550 | ||
1da177e4 LT |
551 | source "arch/s390/Kconfig.debug" |
552 | ||
553 | source "security/Kconfig" | |
554 | ||
555 | source "crypto/Kconfig" | |
556 | ||
557 | source "lib/Kconfig" |