Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | config MMU |
61d48c2c | 3 | def_bool y |
1da177e4 | 4 | |
66701b14 | 5 | config ZONE_DMA |
69dbb2f7 | 6 | def_bool y |
66701b14 | 7 | |
2fd92273 HC |
8 | config CPU_BIG_ENDIAN |
9 | def_bool y | |
10 | ||
2b105ff9 | 11 | config LOCKDEP_SUPPORT |
61d48c2c | 12 | def_bool y |
2b105ff9 | 13 | |
5bdc9b44 | 14 | config STACKTRACE_SUPPORT |
61d48c2c | 15 | def_bool y |
5bdc9b44 | 16 | |
1da177e4 LT |
17 | config RWSEM_GENERIC_SPINLOCK |
18 | bool | |
19 | ||
20 | config RWSEM_XCHGADD_ALGORITHM | |
61d48c2c | 21 | def_bool y |
1da177e4 | 22 | |
f0d1b0b3 | 23 | config ARCH_HAS_ILOG2_U32 |
6f9a3c33 | 24 | def_bool n |
f0d1b0b3 DH |
25 | |
26 | config ARCH_HAS_ILOG2_U64 | |
6f9a3c33 | 27 | def_bool n |
f0d1b0b3 | 28 | |
7e33db4e | 29 | config GENERIC_HWEIGHT |
61d48c2c | 30 | def_bool y |
7e33db4e | 31 | |
c0007f1a | 32 | config GENERIC_BUG |
6f9a3c33 | 33 | def_bool y if BUG |
c0007f1a | 34 | |
52499f40 HC |
35 | config GENERIC_BUG_RELATIVE_POINTERS |
36 | def_bool y | |
37 | ||
b6b40c53 | 38 | config GENERIC_LOCKBREAK |
6f9a3c33 | 39 | def_bool y if SMP && PREEMPT |
b6b40c53 | 40 | |
402b0862 | 41 | config PGSTE |
6f9a3c33 | 42 | def_bool y if KVM |
402b0862 | 43 | |
6a11f75b AM |
44 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
45 | def_bool y | |
46 | ||
843c48fd JG |
47 | config AUDIT_ARCH |
48 | def_bool y | |
49 | ||
ce816fa8 | 50 | config NO_IOPORT_MAP |
c8717a3d JG |
51 | def_bool y |
52 | ||
53 | config PCI_QUIRKS | |
54 | def_bool n | |
55 | ||
2a0a5b22 | 56 | config ARCH_SUPPORTS_UPROBES |
5a79859a | 57 | def_bool y |
2a0a5b22 | 58 | |
5e785963 VG |
59 | config KASAN_SHADOW_OFFSET |
60 | hex | |
61 | depends on KASAN | |
5dff0381 | 62 | default 0x18000000000000 if KASAN_S390_4_LEVEL_PAGING |
5e785963 VG |
63 | default 0x30000000000 |
64 | ||
347a8dc3 | 65 | config S390 |
61d48c2c | 66 | def_bool y |
23fefe11 | 67 | select ARCH_BINFMT_ELF_STATE |
21266be9 | 68 | select ARCH_HAS_DEVMEM_IS_ALLOWED |
2b68f6ca | 69 | select ARCH_HAS_ELF_RANDOMIZE |
79962038 | 70 | select ARCH_HAS_FORTIFY_SOURCE |
957e3fac | 71 | select ARCH_HAS_GCOV_PROFILE_ALL |
e1073d1e | 72 | select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA |
907fa061 | 73 | select ARCH_HAS_KCOV |
3010a5ea | 74 | select ARCH_HAS_PTE_SPECIAL |
d2852a22 | 75 | select ARCH_HAS_SET_MEMORY |
47523c98 | 76 | select ARCH_HAS_SG_CHAIN |
ad21fc4f LA |
77 | select ARCH_HAS_STRICT_KERNEL_RWX |
78 | select ARCH_HAS_STRICT_MODULE_RWX | |
c42d8c7d | 79 | select ARCH_HAS_UBSAN_SANITIZE_ALL |
0e0d04a8 | 80 | select ARCH_HAVE_NMI_SAFE_CMPXCHG |
6beb0009 TG |
81 | select ARCH_INLINE_READ_LOCK |
82 | select ARCH_INLINE_READ_LOCK_BH | |
83 | select ARCH_INLINE_READ_LOCK_IRQ | |
84 | select ARCH_INLINE_READ_LOCK_IRQSAVE | |
0e0d04a8 | 85 | select ARCH_INLINE_READ_TRYLOCK |
6beb0009 TG |
86 | select ARCH_INLINE_READ_UNLOCK |
87 | select ARCH_INLINE_READ_UNLOCK_BH | |
88 | select ARCH_INLINE_READ_UNLOCK_IRQ | |
89 | select ARCH_INLINE_READ_UNLOCK_IRQRESTORE | |
0e0d04a8 HC |
90 | select ARCH_INLINE_SPIN_LOCK |
91 | select ARCH_INLINE_SPIN_LOCK_BH | |
92 | select ARCH_INLINE_SPIN_LOCK_IRQ | |
93 | select ARCH_INLINE_SPIN_LOCK_IRQSAVE | |
94 | select ARCH_INLINE_SPIN_TRYLOCK | |
95 | select ARCH_INLINE_SPIN_TRYLOCK_BH | |
96 | select ARCH_INLINE_SPIN_UNLOCK | |
97 | select ARCH_INLINE_SPIN_UNLOCK_BH | |
98 | select ARCH_INLINE_SPIN_UNLOCK_IRQ | |
99 | select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE | |
6beb0009 TG |
100 | select ARCH_INLINE_WRITE_LOCK |
101 | select ARCH_INLINE_WRITE_LOCK_BH | |
102 | select ARCH_INLINE_WRITE_LOCK_IRQ | |
103 | select ARCH_INLINE_WRITE_LOCK_IRQSAVE | |
0e0d04a8 | 104 | select ARCH_INLINE_WRITE_TRYLOCK |
6beb0009 TG |
105 | select ARCH_INLINE_WRITE_UNLOCK |
106 | select ARCH_INLINE_WRITE_UNLOCK_BH | |
107 | select ARCH_INLINE_WRITE_UNLOCK_IRQ | |
108 | select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE | |
0e0d04a8 | 109 | select ARCH_SAVE_PAGE_KEYS if HIBERNATION |
36e7fdaa | 110 | select ARCH_SUPPORTS_ATOMIC_RMW |
a763bc8b | 111 | select ARCH_SUPPORTS_NUMA_BALANCING |
295d8fa9 | 112 | select ARCH_USE_BUILTIN_BSWAP |
efc1d23b | 113 | select ARCH_USE_CMPXCHG_LOCKREF |
3f6813b9 | 114 | select ARCH_WANTS_DYNAMIC_TASK_STRUCT |
c1d7e01d | 115 | select ARCH_WANT_IPC_PARSE_VERSION |
0e0d04a8 HC |
116 | select BUILDTIME_EXTABLE_SORT |
117 | select CLONE_BACKWARDS2 | |
5d6a0163 | 118 | select DYNAMIC_FTRACE if FUNCTION_TRACER |
0e0d04a8 | 119 | select GENERIC_CLOCKEVENTS |
8f00b3e2 | 120 | select GENERIC_CPU_AUTOPROBE |
0e0d04a8 | 121 | select GENERIC_CPU_DEVICES if !SMP |
d424986f | 122 | select GENERIC_CPU_VULNERABILITIES |
746479cd | 123 | select GENERIC_FIND_FIRST_BIT |
e80e7813 | 124 | select GENERIC_SMP_IDLE_THREAD |
79c74ecb | 125 | select GENERIC_TIME_VSYSCALL |
0e0d04a8 | 126 | select HAVE_ALIGNED_STRUCT_PAGE if SLUB |
7a017721 | 127 | select HAVE_ARCH_AUDITSYSCALL |
5a79859a | 128 | select HAVE_ARCH_JUMP_LABEL |
13ddb52c | 129 | select HAVE_ARCH_JUMP_LABEL_RELATIVE |
42db5ed8 | 130 | select HAVE_ARCH_KASAN |
fff7fb0b | 131 | select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES |
c63cb468 | 132 | select HAVE_ARCH_SECCOMP_FILTER |
5614dd92 | 133 | select HAVE_ARCH_SOFT_DIRTY |
0e0d04a8 | 134 | select HAVE_ARCH_TRACEHOOK |
5a79859a | 135 | select HAVE_ARCH_TRANSPARENT_HUGEPAGE |
ce3dc447 | 136 | select HAVE_ARCH_VMAP_STACK |
6077776b | 137 | select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES |
0e0d04a8 HC |
138 | select HAVE_CMPXCHG_DOUBLE |
139 | select HAVE_CMPXCHG_LOCAL | |
f50c0e63 | 140 | select HAVE_COPY_THREAD_TLS |
0e0d04a8 | 141 | select HAVE_DEBUG_KMEMLEAK |
e1231b0e | 142 | select HAVE_DMA_CONTIGUOUS |
002e6745 | 143 | select DMA_DIRECT_OPS |
5a79859a HC |
144 | select HAVE_DYNAMIC_FTRACE |
145 | select HAVE_DYNAMIC_FTRACE_WITH_REGS | |
9078a549 | 146 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
d983c89c | 147 | select HAVE_FENTRY |
0e0d04a8 | 148 | select HAVE_FTRACE_MCOUNT_RECORD |
5a79859a HC |
149 | select HAVE_FUNCTION_GRAPH_TRACER |
150 | select HAVE_FUNCTION_TRACER | |
03b8c7b6 | 151 | select HAVE_FUTEX_CMPXCHG if FUTEX |
bc00b3ec | 152 | select HAVE_GCC_PLUGINS |
0e0d04a8 HC |
153 | select HAVE_KERNEL_BZIP2 |
154 | select HAVE_KERNEL_GZIP | |
8e2872ce | 155 | select HAVE_KERNEL_LZ4 |
0e0d04a8 HC |
156 | select HAVE_KERNEL_LZMA |
157 | select HAVE_KERNEL_LZO | |
89b5202e | 158 | select HAVE_KERNEL_UNCOMPRESSED |
0e0d04a8 HC |
159 | select HAVE_KERNEL_XZ |
160 | select HAVE_KPROBES | |
161 | select HAVE_KRETPROBES | |
5a79859a | 162 | select HAVE_KVM |
21042d43 | 163 | select HAVE_LIVEPATCH |
c33eff60 HC |
164 | select HAVE_PERF_REGS |
165 | select HAVE_PERF_USER_STACK_DUMP | |
0e0d04a8 HC |
166 | select HAVE_MEMBLOCK |
167 | select HAVE_MEMBLOCK_NODE_MAP | |
50be6345 | 168 | select HAVE_MEMBLOCK_PHYS_MAP |
786d35d4 | 169 | select HAVE_MOD_ARCH_SPECIFIC |
d983c89c | 170 | select HAVE_NOP_MCOUNT |
0e0d04a8 HC |
171 | select HAVE_OPROFILE |
172 | select HAVE_PERF_EVENTS | |
173 | select HAVE_REGS_AND_STACK_ACCESS_API | |
9d6d99e3 | 174 | select HAVE_RSEQ |
0e0d04a8 | 175 | select HAVE_SYSCALL_TRACEPOINTS |
0e0d04a8 | 176 | select HAVE_VIRT_CPU_ACCOUNTING |
786d35d4 | 177 | select MODULES_USE_ELF_RELA |
7eddd99c | 178 | select OLD_SIGACTION |
93bead43 | 179 | select OLD_SIGSUSPEND3 |
bb98f396 | 180 | select SPARSE_IRQ |
0e0d04a8 | 181 | select SYSCTL_EXCEPTION_TRACE |
d5c352cd | 182 | select THREAD_INFO_IN_TASK |
0563416b | 183 | select TTY |
0e0d04a8 | 184 | select VIRT_CPU_ACCOUNTING |
40565b5a | 185 | select ARCH_HAS_SCALED_CPUTIME |
93bead43 | 186 | select VIRT_TO_BUS |
42a0bb3f | 187 | select HAVE_NMI |
3a368f74 | 188 | |
1da177e4 | 189 | |
fca3e357 | 190 | config SCHED_OMIT_FRAME_POINTER |
6f9a3c33 | 191 | def_bool y |
fca3e357 | 192 | |
c81956c9 KS |
193 | config PGTABLE_LEVELS |
194 | int | |
1aea9b3f | 195 | default 5 |
c81956c9 | 196 | |
21042d43 JS |
197 | source "kernel/livepatch/Kconfig" |
198 | ||
843c48fd JG |
199 | menu "Processor type and features" |
200 | ||
201 | config HAVE_MARCH_Z900_FEATURES | |
202 | def_bool n | |
203 | ||
204 | config HAVE_MARCH_Z990_FEATURES | |
205 | def_bool n | |
206 | select HAVE_MARCH_Z900_FEATURES | |
207 | ||
208 | config HAVE_MARCH_Z9_109_FEATURES | |
209 | def_bool n | |
210 | select HAVE_MARCH_Z990_FEATURES | |
211 | ||
212 | config HAVE_MARCH_Z10_FEATURES | |
213 | def_bool n | |
214 | select HAVE_MARCH_Z9_109_FEATURES | |
215 | ||
216 | config HAVE_MARCH_Z196_FEATURES | |
217 | def_bool n | |
218 | select HAVE_MARCH_Z10_FEATURES | |
219 | ||
991c1505 HC |
220 | config HAVE_MARCH_ZEC12_FEATURES |
221 | def_bool n | |
222 | select HAVE_MARCH_Z196_FEATURES | |
223 | ||
f8b2dcbd MS |
224 | config HAVE_MARCH_Z13_FEATURES |
225 | def_bool n | |
226 | select HAVE_MARCH_ZEC12_FEATURES | |
227 | ||
6997c323 MS |
228 | config HAVE_MARCH_Z14_FEATURES |
229 | def_bool n | |
230 | select HAVE_MARCH_Z13_FEATURES | |
231 | ||
843c48fd JG |
232 | choice |
233 | prompt "Processor type" | |
7072276e | 234 | default MARCH_Z196 |
1da177e4 | 235 | |
843c48fd JG |
236 | config MARCH_Z900 |
237 | bool "IBM zSeries model z800 and z900" | |
5a79859a | 238 | select HAVE_MARCH_Z900_FEATURES |
843c48fd JG |
239 | help |
240 | Select this to enable optimizations for model z800/z900 (2064 and | |
241 | 2066 series). This will enable some optimizations that are not | |
242 | available on older ESA/390 (31 Bit) only CPUs. | |
243 | ||
244 | config MARCH_Z990 | |
245 | bool "IBM zSeries model z890 and z990" | |
5a79859a | 246 | select HAVE_MARCH_Z990_FEATURES |
843c48fd JG |
247 | help |
248 | Select this to enable optimizations for model z890/z990 (2084 and | |
249 | 2086 series). The kernel will be slightly faster but will not work | |
250 | on older machines. | |
251 | ||
252 | config MARCH_Z9_109 | |
253 | bool "IBM System z9" | |
5a79859a | 254 | select HAVE_MARCH_Z9_109_FEATURES |
843c48fd JG |
255 | help |
256 | Select this to enable optimizations for IBM System z9 (2094 and | |
257 | 2096 series). The kernel will be slightly faster but will not work | |
258 | on older machines. | |
259 | ||
260 | config MARCH_Z10 | |
261 | bool "IBM System z10" | |
5a79859a | 262 | select HAVE_MARCH_Z10_FEATURES |
843c48fd JG |
263 | help |
264 | Select this to enable optimizations for IBM System z10 (2097 and | |
265 | 2098 series). The kernel will be slightly faster but will not work | |
266 | on older machines. | |
267 | ||
268 | config MARCH_Z196 | |
269 | bool "IBM zEnterprise 114 and 196" | |
5a79859a | 270 | select HAVE_MARCH_Z196_FEATURES |
843c48fd JG |
271 | help |
272 | Select this to enable optimizations for IBM zEnterprise 114 and 196 | |
273 | (2818 and 2817 series). The kernel will be slightly faster but will | |
274 | not work on older machines. | |
1da177e4 | 275 | |
991c1505 | 276 | config MARCH_ZEC12 |
59471227 | 277 | bool "IBM zBC12 and zEC12" |
5a79859a | 278 | select HAVE_MARCH_ZEC12_FEATURES |
991c1505 | 279 | help |
59471227 HC |
280 | Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and |
281 | 2827 series). The kernel will be slightly faster but will not work on | |
282 | older machines. | |
991c1505 | 283 | |
f8b2dcbd | 284 | config MARCH_Z13 |
bb3aa614 | 285 | bool "IBM z13s and z13" |
5a79859a | 286 | select HAVE_MARCH_Z13_FEATURES |
f8b2dcbd | 287 | help |
bb3aa614 HC |
288 | Select this to enable optimizations for IBM z13s and z13 (2965 and |
289 | 2964 series). The kernel will be slightly faster but will not work on | |
290 | older machines. | |
f8b2dcbd | 291 | |
6997c323 | 292 | config MARCH_Z14 |
451239eb | 293 | bool "IBM z14 ZR1 and z14" |
6997c323 MS |
294 | select HAVE_MARCH_Z14_FEATURES |
295 | help | |
451239eb HC |
296 | Select this to enable optimizations for IBM z14 ZR1 and z14 (3907 |
297 | and 3906 series). The kernel will be slightly faster but will not | |
298 | work on older machines. | |
6997c323 | 299 | |
843c48fd | 300 | endchoice |
1da177e4 | 301 | |
1db9e051 HC |
302 | config MARCH_Z900_TUNE |
303 | def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT | |
304 | ||
305 | config MARCH_Z990_TUNE | |
306 | def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT | |
307 | ||
308 | config MARCH_Z9_109_TUNE | |
309 | def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT | |
310 | ||
311 | config MARCH_Z10_TUNE | |
312 | def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT | |
313 | ||
314 | config MARCH_Z196_TUNE | |
315 | def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT | |
316 | ||
317 | config MARCH_ZEC12_TUNE | |
318 | def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT | |
319 | ||
f8b2dcbd MS |
320 | config MARCH_Z13_TUNE |
321 | def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT | |
322 | ||
6997c323 MS |
323 | config MARCH_Z14_TUNE |
324 | def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT | |
325 | ||
1db9e051 HC |
326 | choice |
327 | prompt "Tune code generation" | |
328 | default TUNE_DEFAULT | |
329 | help | |
330 | Cause the compiler to tune (-mtune) the generated code for a machine. | |
331 | This will make the code run faster on the selected machine but | |
332 | somewhat slower on other machines. | |
333 | This option only changes how the compiler emits instructions, not the | |
334 | selection of instructions itself, so the resulting kernel will run on | |
335 | all other machines. | |
336 | ||
337 | config TUNE_DEFAULT | |
338 | bool "Default" | |
339 | help | |
340 | Tune the generated code for the target processor for which the kernel | |
341 | will be compiled. | |
342 | ||
1db9e051 HC |
343 | config TUNE_Z900 |
344 | bool "IBM zSeries model z800 and z900" | |
345 | ||
346 | config TUNE_Z990 | |
347 | bool "IBM zSeries model z890 and z990" | |
348 | ||
349 | config TUNE_Z9_109 | |
350 | bool "IBM System z9" | |
351 | ||
352 | config TUNE_Z10 | |
353 | bool "IBM System z10" | |
354 | ||
355 | config TUNE_Z196 | |
356 | bool "IBM zEnterprise 114 and 196" | |
357 | ||
358 | config TUNE_ZEC12 | |
359 | bool "IBM zBC12 and zEC12" | |
360 | ||
f8b2dcbd MS |
361 | config TUNE_Z13 |
362 | bool "IBM z13" | |
363 | ||
6997c323 MS |
364 | config TUNE_Z14 |
365 | bool "IBM z14" | |
366 | ||
1db9e051 HC |
367 | endchoice |
368 | ||
347a8dc3 | 369 | config 64BIT |
6f9a3c33 | 370 | def_bool y |
d9f7a745 | 371 | |
843c48fd JG |
372 | config COMPAT |
373 | def_bool y | |
374 | prompt "Kernel support for 31 bit emulation" | |
843c48fd JG |
375 | select COMPAT_BINFMT_ELF if BINFMT_ELF |
376 | select ARCH_WANT_OLD_COMPAT_IPC | |
7eddd99c | 377 | select COMPAT_OLD_SIGACTION |
2813893f | 378 | depends on MULTIUSER |
843c48fd JG |
379 | help |
380 | Select this option if you want to enable your system kernel to | |
381 | handle system-calls from ELF binaries for 31 bit ESA. This option | |
382 | (and some other stuff like libraries and such) is needed for | |
383 | executing 31 bit applications. It is safe to say "Y". | |
384 | ||
385 | config SYSVIPC_COMPAT | |
386 | def_bool y if COMPAT && SYSVIPC | |
387 | ||
1da177e4 | 388 | config SMP |
6f9a3c33 MS |
389 | def_bool y |
390 | prompt "Symmetric multi-processing support" | |
1da177e4 LT |
391 | ---help--- |
392 | This enables support for systems with more than one CPU. If you have | |
393 | a system with only one CPU, like most personal computers, say N. If | |
394 | you have a system with more than one CPU, say Y. | |
395 | ||
4a474157 | 396 | If you say N here, the kernel will run on uni- and multiprocessor |
1da177e4 LT |
397 | machines, but will use only one CPU of a multiprocessor machine. If |
398 | you say Y here, the kernel will run on many, but not all, | |
4a474157 | 399 | uniprocessor machines. On a uniprocessor machine, the kernel |
1da177e4 LT |
400 | will run faster if you say N here. |
401 | ||
03502faa AB |
402 | See also the SMP-HOWTO available at |
403 | <http://www.tldp.org/docs.html#howto>. | |
1da177e4 LT |
404 | |
405 | Even if you don't know what to do here, say Y. | |
406 | ||
407 | config NR_CPUS | |
5c75a0da HC |
408 | int "Maximum number of CPUs (2-512)" |
409 | range 2 512 | |
1da177e4 | 410 | depends on SMP |
5a79859a | 411 | default "64" |
1da177e4 LT |
412 | help |
413 | This allows you to specify the maximum number of CPUs which this | |
5c75a0da | 414 | kernel will support. The maximum supported value is 512 and the |
1da177e4 LT |
415 | minimum value which makes sense is 2. |
416 | ||
417 | This is purely to save memory - each supported CPU adds | |
418 | approximately sixteen kilobytes to the kernel image. | |
419 | ||
420 | config HOTPLUG_CPU | |
6f9a3c33 MS |
421 | def_bool y |
422 | prompt "Support for hot-pluggable CPUs" | |
1da177e4 | 423 | depends on SMP |
1da177e4 LT |
424 | help |
425 | Say Y here to be able to turn CPUs off and on. CPUs | |
426 | can be controlled through /sys/devices/system/cpu/cpu#. | |
427 | Say N if you want to disable CPU hotplug. | |
428 | ||
3a368f74 PH |
429 | # Some NUMA nodes have memory ranges that span |
430 | # other nodes. Even though a pfn is valid and | |
431 | # between a node's start and end pfns, it may not | |
432 | # reside on that node. See memmap_init_zone() | |
433 | # for details. <- They meant memory holes! | |
434 | config NODES_SPAN_OTHER_NODES | |
435 | def_bool NUMA | |
436 | ||
437 | config NUMA | |
438 | bool "NUMA support" | |
c095a949 | 439 | depends on SMP && SCHED_TOPOLOGY |
3a368f74 PH |
440 | default n |
441 | help | |
442 | Enable NUMA support | |
443 | ||
444 | This option adds NUMA support to the kernel. | |
445 | ||
446 | An operation mode can be selected by appending | |
447 | numa=<method> to the kernel command line. | |
448 | ||
449 | The default behaviour is identical to appending numa=plain to | |
450 | the command line. This will create just one node with all | |
451 | available memory and all CPUs in it. | |
452 | ||
453 | config NODES_SHIFT | |
454 | int "Maximum NUMA nodes (as a power of 2)" | |
455 | range 1 10 | |
456 | depends on NUMA | |
457 | default "4" | |
458 | help | |
459 | Specify the maximum number of NUMA nodes available on the target | |
460 | system. Increases memory reserved to accommodate various tables. | |
461 | ||
c29a7baf MH |
462 | menu "Select NUMA modes" |
463 | depends on NUMA | |
464 | ||
465 | config NUMA_EMU | |
466 | bool "NUMA emulation" | |
467 | default y | |
468 | help | |
469 | Numa emulation mode will split the available system memory into | |
470 | equal chunks which then are distributed over the configured number | |
471 | of nodes in a round-robin manner. | |
472 | ||
473 | The number of fake nodes is limited by the number of available memory | |
474 | chunks (i.e. memory size / fake size) and the number of supported | |
475 | nodes in the kernel. | |
476 | ||
477 | The CPUs are assigned to the nodes in a way that partially respects | |
478 | the original machine topology (if supported by the machine). | |
479 | Fair distribution of the CPUs is not guaranteed. | |
480 | ||
481 | config EMU_SIZE | |
482 | hex "NUMA emulation memory chunk size" | |
483 | default 0x10000000 | |
484 | range 0x400000 0x100000000 | |
485 | depends on NUMA_EMU | |
486 | help | |
487 | Select the default size by which the memory is chopped and then | |
488 | assigned to emulated NUMA nodes. | |
489 | ||
490 | This can be overridden by specifying | |
491 | ||
492 | emu_size=<n> | |
493 | ||
494 | on the kernel command line where also suffixes K, M, G, and T are | |
495 | supported. | |
496 | ||
497 | endmenu | |
9236b4dd HC |
498 | |
499 | config SCHED_SMT | |
500 | def_bool n | |
c29a7baf | 501 | |
8d11e021 | 502 | config SCHED_MC |
83a24e32 | 503 | def_bool n |
8d11e021 | 504 | |
4cb14bc8 | 505 | config SCHED_BOOK |
10ad34bc MS |
506 | def_bool n |
507 | ||
adac0f1e HC |
508 | config SCHED_DRAWER |
509 | def_bool n | |
510 | ||
10ad34bc | 511 | config SCHED_TOPOLOGY |
6f9a3c33 | 512 | def_bool y |
10ad34bc | 513 | prompt "Topology scheduler support" |
83a24e32 | 514 | depends on SMP |
10ad34bc | 515 | select SCHED_SMT |
83a24e32 | 516 | select SCHED_MC |
10ad34bc | 517 | select SCHED_BOOK |
adac0f1e | 518 | select SCHED_DRAWER |
4cb14bc8 | 519 | help |
10ad34bc MS |
520 | Topology scheduler support improves the CPU scheduler's decision |
521 | making when dealing with machines that have multi-threading, | |
522 | multiple cores or multiple books. | |
4cb14bc8 | 523 | |
843c48fd | 524 | source kernel/Kconfig.hz |
1da177e4 | 525 | |
bdea9f6f PR |
526 | config KEXEC |
527 | def_bool y | |
528 | select KEXEC_CORE | |
529 | ||
530 | config KEXEC_FILE | |
531 | bool "kexec file based system call" | |
532 | select KEXEC_CORE | |
533 | select BUILD_BIN2C | |
534 | depends on CRYPTO | |
535 | depends on CRYPTO_SHA256 | |
536 | depends on CRYPTO_SHA256_S390 | |
537 | help | |
538 | Enable the kexec file based system call. In contrast to the normal | |
539 | kexec system call this system call takes file descriptors for the | |
540 | kernel and initramfs as arguments. | |
541 | ||
542 | config ARCH_HAS_KEXEC_PURGATORY | |
543 | def_bool y | |
544 | depends on KEXEC_FILE | |
545 | ||
4c637cd8 HF |
546 | config ARCH_RANDOM |
547 | def_bool y | |
548 | prompt "s390 architectural random number generation API" | |
549 | help | |
550 | Enable the s390 architectural random number generation API | |
551 | to provide random data for all consumers within the Linux | |
552 | kernel. | |
553 | ||
554 | When enabled the arch_random_* functions declared in linux/random.h | |
555 | are implemented. The implementation is based on the s390 CPACF | |
556 | instruction subfunction TRNG which provides a real true random | |
557 | number generator. | |
558 | ||
559 | If unsure, say Y. | |
560 | ||
d768bd89 MS |
561 | config KERNEL_NOBP |
562 | def_bool n | |
563 | prompt "Enable modified branch prediction for the kernel by default" | |
564 | help | |
565 | If this option is selected the kernel will switch to a modified | |
566 | branch prediction mode if the firmware interface is available. | |
567 | The modified branch prediction mode improves the behaviour in | |
568 | regard to speculative execution. | |
569 | ||
570 | With the option enabled the kernel parameter "nobp=0" or "nospec" | |
571 | can be used to run the kernel in the normal branch prediction mode. | |
572 | ||
573 | With the option disabled the modified branch prediction mode is | |
574 | enabled with the "nobp=1" kernel parameter. | |
575 | ||
576 | If unsure, say N. | |
577 | ||
f19fbd5e MS |
578 | config EXPOLINE |
579 | def_bool n | |
580 | prompt "Avoid speculative indirect branches in the kernel" | |
581 | help | |
582 | Compile the kernel with the expoline compiler options to guard | |
583 | against kernel-to-user data leaks by avoiding speculative indirect | |
584 | branches. | |
585 | Requires a compiler with -mindirect-branch=thunk support for full | |
586 | protection. The kernel may run slower. | |
587 | ||
588 | If unsure, say N. | |
589 | ||
590 | choice | |
591 | prompt "Expoline default" | |
592 | depends on EXPOLINE | |
593 | default EXPOLINE_FULL | |
594 | ||
595 | config EXPOLINE_OFF | |
596 | bool "spectre_v2=off" | |
597 | ||
6e179d64 | 598 | config EXPOLINE_AUTO |
f19fbd5e MS |
599 | bool "spectre_v2=auto" |
600 | ||
601 | config EXPOLINE_FULL | |
602 | bool "spectre_v2=on" | |
603 | ||
604 | endchoice | |
605 | ||
843c48fd | 606 | endmenu |
1da177e4 | 607 | |
843c48fd | 608 | menu "Memory setup" |
1d057720 | 609 | |
843c48fd | 610 | config ARCH_SPARSEMEM_ENABLE |
6f9a3c33 | 611 | def_bool y |
843c48fd JG |
612 | select SPARSEMEM_VMEMMAP_ENABLE |
613 | select SPARSEMEM_VMEMMAP | |
e65e1fc2 | 614 | |
843c48fd JG |
615 | config ARCH_SPARSEMEM_DEFAULT |
616 | def_bool y | |
1da177e4 | 617 | |
843c48fd JG |
618 | config ARCH_SELECT_MEMORY_MODEL |
619 | def_bool y | |
1da177e4 | 620 | |
843c48fd JG |
621 | config ARCH_ENABLE_MEMORY_HOTPLUG |
622 | def_bool y if SPARSEMEM | |
0efa4703 | 623 | |
843c48fd JG |
624 | config ARCH_ENABLE_MEMORY_HOTREMOVE |
625 | def_bool y | |
e37f50e1 | 626 | |
ec66ad66 MS |
627 | config ARCH_ENABLE_SPLIT_PMD_PTLOCK |
628 | def_bool y | |
ec66ad66 | 629 | |
843c48fd JG |
630 | config FORCE_MAX_ZONEORDER |
631 | int | |
632 | default "9" | |
f861e405 | 633 | |
b8402b95 HC |
634 | config MAX_PHYSMEM_BITS |
635 | int "Maximum size of supported physical memory in bits (42-53)" | |
636 | range 42 53 | |
637 | default "46" | |
638 | help | |
639 | This option specifies the maximum supported size of physical memory | |
640 | in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB). | |
641 | Increasing the number of bits also increases the kernel image size. | |
642 | By default 46 bits (64TB) are supported. | |
643 | ||
1da177e4 | 644 | config PACK_STACK |
6f9a3c33 MS |
645 | def_bool y |
646 | prompt "Pack kernel stack" | |
1da177e4 LT |
647 | help |
648 | This option enables the compiler option -mkernel-backchain if it | |
649 | is available. If the option is available the compiler supports | |
650 | the new stack layout which dramatically reduces the minimum stack | |
651 | frame size. With an old compiler a non-leaf function needs a | |
652 | minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With | |
653 | -mkernel-backchain the minimum size drops to 16 byte on 31 bit | |
654 | and 24 byte on 64 bit. | |
655 | ||
656 | Say Y if you are unsure. | |
657 | ||
1da177e4 | 658 | config CHECK_STACK |
6f9a3c33 | 659 | def_bool y |
ce3dc447 | 660 | depends on !VMAP_STACK |
6f9a3c33 | 661 | prompt "Detect kernel stack overflow" |
1da177e4 LT |
662 | help |
663 | This option enables the compiler option -mstack-guard and | |
664 | -mstack-size if they are available. If the compiler supports them | |
665 | it will emit additional code to each function prolog to trigger | |
666 | an illegal operation if the kernel stack is about to overflow. | |
667 | ||
668 | Say N if you are unsure. | |
669 | ||
670 | config STACK_GUARD | |
671 | int "Size of the guard area (128-1024)" | |
672 | range 128 1024 | |
673 | depends on CHECK_STACK | |
674 | default "256" | |
675 | help | |
676 | This allows you to specify the size of the guard area at the lower | |
677 | end of the kernel stack. If the kernel stack points into the guard | |
678 | area on function entry an illegal operation is triggered. The size | |
679 | needs to be a power of 2. Please keep in mind that the size of an | |
680 | interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. | |
681 | The minimum size for the stack guard should be 256 for 31 bit and | |
682 | 512 for 64 bit. | |
683 | ||
2c190da4 | 684 | config WARN_DYNAMIC_STACK |
6f9a3c33 | 685 | def_bool n |
2c190da4 | 686 | prompt "Emit compiler warnings for function with dynamic stack usage" |
1da177e4 | 687 | help |
2c190da4 JG |
688 | This option enables the compiler option -mwarn-dynamicstack. If the |
689 | compiler supports this options generates warnings for functions | |
690 | that dynamically allocate stack space using alloca. | |
1da177e4 LT |
691 | |
692 | Say N if you are unsure. | |
693 | ||
843c48fd | 694 | endmenu |
3f22ab27 | 695 | |
843c48fd | 696 | menu "I/O subsystem" |
1da177e4 | 697 | |
1da177e4 | 698 | config QDIO |
6f9a3c33 MS |
699 | def_tristate y |
700 | prompt "QDIO support" | |
1da177e4 | 701 | ---help--- |
8129ee16 | 702 | This driver provides the Queued Direct I/O base support for |
efca13bc | 703 | IBM System z. |
1da177e4 LT |
704 | |
705 | To compile this driver as a module, choose M here: the | |
706 | module will be called qdio. | |
707 | ||
708 | If unsure, say Y. | |
709 | ||
c8717a3d JG |
710 | menuconfig PCI |
711 | bool "PCI support" | |
c8717a3d | 712 | select PCI_MSI |
a4ce5a48 | 713 | select IOMMU_HELPER |
8128f23c | 714 | select IOMMU_SUPPORT |
f616ab59 | 715 | select NEED_DMA_MAP_STATE |
86596f0a | 716 | select NEED_SG_DMA_LENGTH |
a4ce5a48 | 717 | |
c8717a3d JG |
718 | help |
719 | Enable PCI support. | |
720 | ||
721 | if PCI | |
722 | ||
723 | config PCI_NR_FUNCTIONS | |
724 | int "Maximum number of PCI functions (1-4096)" | |
725 | range 1 4096 | |
b18601b0 | 726 | default "128" |
c8717a3d JG |
727 | help |
728 | This allows you to specify the maximum number of PCI functions which | |
729 | this kernel will support. | |
730 | ||
731 | source "drivers/pci/Kconfig" | |
c8717a3d JG |
732 | |
733 | endif # PCI | |
734 | ||
735 | config PCI_DOMAINS | |
736 | def_bool PCI | |
737 | ||
738 | config HAS_IOMEM | |
739 | def_bool PCI | |
740 | ||
9d92a7e1 | 741 | config CHSC_SCH |
d9c11b1e | 742 | def_tristate m |
6f9a3c33 | 743 | prompt "Support for CHSC subchannels" |
9d92a7e1 CH |
744 | help |
745 | This driver allows usage of CHSC subchannels. A CHSC subchannel | |
746 | is usually present on LPAR only. | |
747 | The driver creates a device /dev/chsc, which may be used to | |
748 | obtain I/O configuration information about the machine and | |
749 | to issue asynchronous chsc commands (DANGEROUS). | |
750 | You will usually only want to use this interface on a special | |
751 | LPAR designated for system management. | |
752 | ||
753 | To compile this driver as a module, choose M here: the | |
754 | module will be called chsc_sch. | |
755 | ||
756 | If unsure, say N. | |
757 | ||
1d1c8f78 SO |
758 | config SCM_BUS |
759 | def_bool y | |
1d1c8f78 SO |
760 | prompt "SCM bus driver" |
761 | help | |
762 | Bus driver for Storage Class Memory. | |
763 | ||
eadb86ab SO |
764 | config EADM_SCH |
765 | def_tristate m | |
766 | prompt "Support for EADM subchannels" | |
767 | depends on SCM_BUS | |
768 | help | |
769 | This driver allows usage of EADM subchannels. EADM subchannels act | |
770 | as a communication vehicle for SCM increments. | |
771 | ||
772 | To compile this driver as a module, choose M here: the | |
773 | module will be called eadm_sch. | |
774 | ||
63f1934d DJS |
775 | config VFIO_CCW |
776 | def_tristate n | |
777 | prompt "Support for VFIO-CCW subchannels" | |
84cd8fc4 | 778 | depends on S390_CCW_IOMMU && VFIO_MDEV |
63f1934d DJS |
779 | help |
780 | This driver allows usage of I/O subchannels via VFIO-CCW. | |
781 | ||
782 | To compile this driver as a module, choose M here: the | |
783 | module will be called vfio_ccw. | |
784 | ||
1fde5734 TK |
785 | config VFIO_AP |
786 | def_tristate n | |
787 | prompt "VFIO support for AP devices" | |
788 | depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM | |
789 | help | |
790 | This driver grants access to Adjunct Processor (AP) devices | |
791 | via the VFIO mediated device interface. | |
792 | ||
793 | To compile this driver as a module, choose M here: the module | |
794 | will be called vfio_ap. | |
795 | ||
843c48fd JG |
796 | endmenu |
797 | ||
798 | menu "Dump support" | |
799 | ||
800 | config CRASH_DUMP | |
801 | bool "kernel crash dumps" | |
5a79859a | 802 | depends on SMP |
843c48fd JG |
803 | select KEXEC |
804 | help | |
805 | Generate crash dump after being started by kexec. | |
806 | Crash dump kernels are loaded in the main kernel with kexec-tools | |
807 | into a specially reserved region and then later executed after | |
808 | a crash by kdump/kexec. | |
843c48fd | 809 | Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this. |
bf28a597 MH |
810 | This option also enables s390 zfcpdump. |
811 | See also <file:Documentation/s390/zfcpdump.txt> | |
843c48fd JG |
812 | |
813 | endmenu | |
814 | ||
843c48fd JG |
815 | config SECCOMP |
816 | def_bool y | |
817 | prompt "Enable seccomp to safely compute untrusted bytecode" | |
818 | depends on PROC_FS | |
819 | help | |
820 | This kernel feature is useful for number crunching applications | |
821 | that may need to compute untrusted bytecode during their | |
822 | execution. By using pipes or other transports made available to | |
823 | the process as file descriptors supporting the read/write | |
824 | syscalls, it's possible to isolate those applications in | |
825 | their own address space using seccomp. Once seccomp is | |
826 | enabled via /proc/<pid>/seccomp, it cannot be disabled | |
827 | and the task is only allowed to execute a few safe syscalls | |
828 | defined by each seccomp mode. | |
829 | ||
830 | If unsure, say Y. | |
831 | ||
843c48fd JG |
832 | menu "Power Management" |
833 | ||
834 | config ARCH_HIBERNATION_POSSIBLE | |
5a79859a | 835 | def_bool y |
843c48fd JG |
836 | |
837 | source "kernel/power/Kconfig" | |
838 | ||
839 | endmenu | |
840 | ||
843c48fd JG |
841 | config PCMCIA |
842 | def_bool n | |
843 | ||
844 | config CCW | |
845 | def_bool y | |
846 | ||
b6ef86e9 UB |
847 | config HAVE_PNETID |
848 | tristate | |
849 | default (SMC || CCWGROUP) | |
850 | ||
843c48fd | 851 | menu "Virtualization" |
684de39b | 852 | |
1da177e4 | 853 | config PFAULT |
6f9a3c33 MS |
854 | def_bool y |
855 | prompt "Pseudo page fault support" | |
1da177e4 LT |
856 | help |
857 | Select this option, if you want to use PFAULT pseudo page fault | |
858 | handling under VM. If running native or in LPAR, this option | |
859 | has no effect. If your VM does not support PFAULT, PAGEEX | |
860 | pseudo page fault handling will be used. | |
861 | Note that VM 4.2 supports PFAULT but has a bug in its | |
862 | implementation that causes some problems. | |
863 | Everybody who wants to run Linux under VM != VM4.2 should select | |
864 | this option. | |
865 | ||
1da177e4 | 866 | config CMM |
6f9a3c33 MS |
867 | def_tristate n |
868 | prompt "Cooperative memory management" | |
1da177e4 LT |
869 | help |
870 | Select this option, if you want to enable the kernel interface | |
871 | to reduce the memory size of the system. This is accomplished | |
872 | by allocating pages of memory and put them "on hold". This only | |
873 | makes sense for a system running under VM where the unused pages | |
874 | will be reused by VM for other guest systems. The interface | |
875 | allows an external monitor to balance memory of many systems. | |
876 | Everybody who wants to run Linux under VM should select this | |
877 | option. | |
878 | ||
1da177e4 | 879 | config CMM_IUCV |
6f9a3c33 MS |
880 | def_bool y |
881 | prompt "IUCV special message interface to cooperative memory management" | |
1da177e4 LT |
882 | depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) |
883 | help | |
884 | Select this option to enable the special message interface to | |
885 | the cooperative memory management. | |
886 | ||
1da177e4 | 887 | config APPLDATA_BASE |
6f9a3c33 MS |
888 | def_bool n |
889 | prompt "Linux - VM Monitor Stream, base infrastructure" | |
c185b783 | 890 | depends on PROC_FS |
1da177e4 LT |
891 | help |
892 | This provides a kernel interface for creating and updating z/VM APPLDATA | |
893 | monitor records. The monitor records are updated at certain time | |
894 | intervals, once the timer is started. | |
895 | Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, | |
896 | i.e. enables or disables monitoring on the Linux side. | |
897 | A custom interval value (in seconds) can be written to | |
898 | /proc/appldata/interval. | |
899 | ||
900 | Defaults are 60 seconds interval and timer off. | |
901 | The /proc entries can also be read from, showing the current settings. | |
902 | ||
903 | config APPLDATA_MEM | |
6f9a3c33 MS |
904 | def_tristate m |
905 | prompt "Monitor memory management statistics" | |
62fb2ba3 | 906 | depends on APPLDATA_BASE && VM_EVENT_COUNTERS |
1da177e4 LT |
907 | help |
908 | This provides memory management related data to the Linux - VM Monitor | |
909 | Stream, like paging/swapping rate, memory utilisation, etc. | |
910 | Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM | |
911 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
912 | on the z/VM side. | |
913 | ||
914 | Default is disabled. | |
915 | The /proc entry can also be read from, showing the current settings. | |
916 | ||
917 | This can also be compiled as a module, which will be called | |
918 | appldata_mem.o. | |
919 | ||
920 | config APPLDATA_OS | |
6f9a3c33 MS |
921 | def_tristate m |
922 | prompt "Monitor OS statistics" | |
1da177e4 LT |
923 | depends on APPLDATA_BASE |
924 | help | |
925 | This provides OS related data to the Linux - VM Monitor Stream, like | |
926 | CPU utilisation, etc. | |
927 | Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM | |
928 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
929 | on the z/VM side. | |
930 | ||
931 | Default is disabled. | |
932 | This can also be compiled as a module, which will be called | |
933 | appldata_os.o. | |
934 | ||
935 | config APPLDATA_NET_SUM | |
6f9a3c33 MS |
936 | def_tristate m |
937 | prompt "Monitor overall network statistics" | |
70193af9 | 938 | depends on APPLDATA_BASE && NET |
1da177e4 LT |
939 | help |
940 | This provides network related data to the Linux - VM Monitor Stream, | |
941 | currently there is only a total sum of network I/O statistics, no | |
942 | per-interface data. | |
943 | Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM | |
944 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
945 | on the z/VM side. | |
946 | ||
947 | Default is disabled. | |
948 | This can also be compiled as a module, which will be called | |
949 | appldata_net_sum.o. | |
950 | ||
24bbb1fa | 951 | config S390_HYPFS_FS |
6f9a3c33 MS |
952 | def_bool y |
953 | prompt "s390 hypervisor file system support" | |
24bbb1fa | 954 | select SYS_HYPERVISOR |
24bbb1fa MH |
955 | help |
956 | This is a virtual file system intended to provide accounting | |
957 | information in an s390 hypervisor environment. | |
958 | ||
843c48fd | 959 | source "arch/s390/kvm/Kconfig" |
411ed322 | 960 | |
fa587743 | 961 | config S390_GUEST |
6f9a3c33 | 962 | def_bool y |
510cf5a6 | 963 | prompt "s390 support for virtio devices" |
79b6f7fb | 964 | select TTY |
80629b0b | 965 | select VIRTUALIZATION |
fa587743 | 966 | select VIRTIO |
faeba830 | 967 | select VIRTIO_CONSOLE |
fa587743 | 968 | help |
bdd1fc27 CH |
969 | Enabling this option adds support for virtio based paravirtual device |
970 | drivers on s390. | |
1da177e4 | 971 | |
20766c08 | 972 | Select this option if you want to run the kernel as a guest under |
bdd1fc27 | 973 | the KVM hypervisor. |
155af2f9 HJP |
974 | |
975 | endmenu |