blob: e5dac123618519051f776b78b74c869d2267d693 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001config MMU
Martin Schwidefsky61d48c22007-05-10 15:46:00 +02002 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -07003
Christoph Lameter66701b12007-02-10 01:43:09 -08004config ZONE_DMA
Heiko Carstens69dbb2f2011-05-26 09:48:31 +02005 def_bool y
Christoph Lameter66701b12007-02-10 01:43:09 -08006
Ingo Molnar2b105ff2006-07-03 00:25:02 -07007config LOCKDEP_SUPPORT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +02008 def_bool y
Ingo Molnar2b105ff2006-07-03 00:25:02 -07009
Heiko Carstens5bdc9b42006-07-03 00:24:41 -070010config STACKTRACE_SUPPORT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020011 def_bool y
Heiko Carstens5bdc9b42006-07-03 00:24:41 -070012
Heiko Carstensa3afe702008-02-05 16:50:45 +010013config HAVE_LATENCYTOP_SUPPORT
14 def_bool y
15
Linus Torvalds1da177e2005-04-16 15:20:36 -070016config RWSEM_GENERIC_SPINLOCK
17 bool
18
19config RWSEM_XCHGADD_ALGORITHM
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020020 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
David Howellsf0d1b0b2006-12-08 02:37:49 -080022config ARCH_HAS_ILOG2_U32
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010023 def_bool n
David Howellsf0d1b0b2006-12-08 02:37:49 -080024
25config ARCH_HAS_ILOG2_U64
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010026 def_bool n
David Howellsf0d1b0b2006-12-08 02:37:49 -080027
Akinobu Mita7e33db42006-03-26 01:39:34 -080028config GENERIC_HWEIGHT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020029 def_bool y
Akinobu Mita7e33db42006-03-26 01:39:34 -080030
Heiko Carstensc0007f12007-04-27 16:01:42 +020031config GENERIC_BUG
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010032 def_bool y if BUG
Heiko Carstensc0007f12007-04-27 16:01:42 +020033
Heiko Carstens52499f42010-02-26 22:37:44 +010034config GENERIC_BUG_RELATIVE_POINTERS
35 def_bool y
36
Al Viro23db7642007-02-11 18:15:29 +000037config NO_IOMEM
Al Viro5ea81762007-02-11 15:41:31 +000038 def_bool y
39
Heiko Carstens411f0f32007-05-06 14:49:09 -070040config NO_DMA
41 def_bool y
42
FUJITA Tomonorieca577e2010-10-25 16:10:50 +020043config ARCH_DMA_ADDR_T_64BIT
44 def_bool 64BIT
45
Martin Schwidefskyb6b40c52008-02-05 16:50:42 +010046config GENERIC_LOCKBREAK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010047 def_bool y if SMP && PREEMPT
Martin Schwidefskyb6b40c52008-02-05 16:50:42 +010048
Carsten Otte402b0862008-03-25 18:47:10 +010049config PGSTE
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010050 def_bool y if KVM
Carsten Otte402b0862008-03-25 18:47:10 +010051
Akinobu Mita6a11f752009-03-31 15:23:17 -070052config ARCH_SUPPORTS_DEBUG_PAGEALLOC
53 def_bool y
54
Jan Glauber843c48f2012-08-27 10:55:18 +020055config KEXEC
56 def_bool y
57
58config AUDIT_ARCH
59 def_bool y
60
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080061config S390
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020062 def_bool y
Heiko Carstensca9fc752008-12-25 13:38:39 +010063 select USE_GENERIC_SMP_HELPERS if SMP
Martin Schwidefsky5d3b56f2012-03-23 11:13:07 +010064 select GENERIC_CPU_DEVICES if !SMP
Heiko Carstensed6bb612009-01-14 14:14:01 +010065 select HAVE_SYSCALL_WRAPPERS
Heiko Carstens5d360a72008-12-25 13:38:56 +010066 select HAVE_FUNCTION_TRACER
Heiko Carstens8b4488f2009-06-12 10:26:45 +020067 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020068 select HAVE_FTRACE_MCOUNT_RECORD
Heiko Carstensb25c4772010-10-29 16:50:42 +020069 select HAVE_C_RECORDMCOUNT
Josh Stone66700002009-08-24 14:43:11 -070070 select HAVE_SYSCALL_TRACEPOINTS
Catalin Marinas7ac57a82012-10-08 16:28:16 -070071 select SYSCTL_EXCEPTION_TRACE
Heiko Carstensdfd9f7a2009-06-12 10:26:44 +020072 select HAVE_DYNAMIC_FTRACE
Heiko Carstens88dbd202009-06-12 10:26:46 +020073 select HAVE_FUNCTION_GRAPH_TRACER
Heiko Carstens952974ac62010-02-12 13:38:40 +010074 select HAVE_REGS_AND_STACK_ACCESS_API
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050075 select HAVE_OPROFILE
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050076 select HAVE_KPROBES
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080077 select HAVE_KRETPROBES
Christian Borntraeger77b455f2008-03-25 18:47:36 +010078 select HAVE_KVM if 64BIT
Martin Schwidefsky753c4dd2008-10-10 21:33:20 +020079 select HAVE_ARCH_TRACEHOOK
Rusty Russell98a79d62008-12-13 21:19:41 +103080 select INIT_ALL_POSSIBLE
Peter Zijlstrae360adb2010-10-14 14:01:34 +080081 select HAVE_IRQ_WORK
Ingo Molnarcdd6c482009-09-21 12:02:48 +020082 select HAVE_PERF_EVENTS
Huang Yingdf013ff2011-07-13 13:14:22 +080083 select ARCH_HAVE_NMI_SAFE_CMPXCHG
Catalin Marinasb69ec422012-10-08 16:28:11 -070084 select HAVE_DEBUG_KMEMLEAK
Martin Schwidefsky1844c9b2010-02-26 22:37:53 +010085 select HAVE_KERNEL_GZIP
86 select HAVE_KERNEL_BZIP2
87 select HAVE_KERNEL_LZMA
Heiko Carstenscdf56642010-05-26 23:27:12 +020088 select HAVE_KERNEL_LZO
Heiko Carstensd7b081a2011-03-15 17:08:32 +010089 select HAVE_KERNEL_XZ
Gerald Schaefer34b133f2011-01-05 12:48:14 +010090 select HAVE_ARCH_MUTEX_CPU_RELAX
Jan Glauber5373db82011-03-16 15:58:30 -040091 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
Martin Schwidefskyc10302e2012-07-31 16:23:59 +020092 select HAVE_BPF_JIT if 64BIT && PACK_STACK
Martin Schwidefsky85055dd2011-08-17 20:42:24 +020093 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
Catalin Marinas74634492012-07-30 14:41:09 -070094 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
Tejun Heoff38df32011-12-08 10:22:09 -080095 select HAVE_MEMBLOCK
96 select HAVE_MEMBLOCK_NODE_MAP
Heiko Carstens2e30db952012-05-29 11:21:27 +020097 select HAVE_CMPXCHG_LOCAL
Heiko Carstensb1d6b402012-09-17 07:37:13 +020098 select HAVE_CMPXCHG_DOUBLE
Frederic Weisbeckerb9527412012-06-16 15:39:34 +020099 select HAVE_VIRT_CPU_ACCOUNTING
100 select VIRT_CPU_ACCOUNTING
Tejun Heoff38df32011-12-08 10:22:09 -0800101 select ARCH_DISCARD_MEMBLOCK
Heiko Carstens3193a982012-07-24 14:51:34 +0200102 select BUILDTIME_EXTABLE_SORT
Thomas Gleixner6beb0002009-11-09 15:21:34 +0000103 select ARCH_INLINE_SPIN_TRYLOCK
104 select ARCH_INLINE_SPIN_TRYLOCK_BH
105 select ARCH_INLINE_SPIN_LOCK
106 select ARCH_INLINE_SPIN_LOCK_BH
107 select ARCH_INLINE_SPIN_LOCK_IRQ
108 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
109 select ARCH_INLINE_SPIN_UNLOCK
110 select ARCH_INLINE_SPIN_UNLOCK_BH
111 select ARCH_INLINE_SPIN_UNLOCK_IRQ
112 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
113 select ARCH_INLINE_READ_TRYLOCK
114 select ARCH_INLINE_READ_LOCK
115 select ARCH_INLINE_READ_LOCK_BH
116 select ARCH_INLINE_READ_LOCK_IRQ
117 select ARCH_INLINE_READ_LOCK_IRQSAVE
118 select ARCH_INLINE_READ_UNLOCK
119 select ARCH_INLINE_READ_UNLOCK_BH
120 select ARCH_INLINE_READ_UNLOCK_IRQ
121 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
122 select ARCH_INLINE_WRITE_TRYLOCK
123 select ARCH_INLINE_WRITE_LOCK
124 select ARCH_INLINE_WRITE_LOCK_BH
125 select ARCH_INLINE_WRITE_LOCK_IRQ
126 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
127 select ARCH_INLINE_WRITE_UNLOCK
128 select ARCH_INLINE_WRITE_UNLOCK_BH
129 select ARCH_INLINE_WRITE_UNLOCK_IRQ
130 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
Catalin Marinasaf1839e2012-10-08 16:28:08 -0700131 select HAVE_UID16 if 32BIT
Will Deaconc1d7e012012-07-30 14:42:46 -0700132 select ARCH_WANT_IPC_PARSE_VERSION
Thomas Gleixnere80e7812012-04-20 13:05:52 +0000133 select GENERIC_SMP_IDLE_THREAD
John Stultz70639422012-09-04 15:34:21 -0400134 select GENERIC_TIME_VSYSCALL_OLD
Anna-Maria Gleixnera6527b92012-05-18 16:45:52 +0000135 select GENERIC_CLOCKEVENTS
136 select KTIME_SCALAR if 32BIT
Heiko Carstensc63cb462012-07-31 15:37:13 +0200137 select HAVE_ARCH_SECCOMP_FILTER
Al Virof9a7e022012-09-21 20:48:32 -0400138 select GENERIC_KERNEL_THREAD
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
Martin Schwidefskyfca3e352009-07-07 16:37:10 +0200140config SCHED_OMIT_FRAME_POINTER
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100141 def_bool y
Martin Schwidefskyfca3e352009-07-07 16:37:10 +0200142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143source "init/Kconfig"
144
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700145source "kernel/Kconfig.freezer"
146
Jan Glauber843c48f2012-08-27 10:55:18 +0200147menu "Processor type and features"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Jan Glauber843c48f2012-08-27 10:55:18 +0200149config HAVE_MARCH_Z900_FEATURES
150 def_bool n
151
152config HAVE_MARCH_Z990_FEATURES
153 def_bool n
154 select HAVE_MARCH_Z900_FEATURES
155
156config HAVE_MARCH_Z9_109_FEATURES
157 def_bool n
158 select HAVE_MARCH_Z990_FEATURES
159
160config HAVE_MARCH_Z10_FEATURES
161 def_bool n
162 select HAVE_MARCH_Z9_109_FEATURES
163
164config HAVE_MARCH_Z196_FEATURES
165 def_bool n
166 select HAVE_MARCH_Z10_FEATURES
167
168choice
169 prompt "Processor type"
170 default MARCH_G5
171
172config MARCH_G5
173 bool "System/390 model G5 and G6"
174 depends on !64BIT
175 help
176 Select this to build a 31 bit kernel that works
177 on all ESA/390 and z/Architecture machines.
178
179config MARCH_Z900
180 bool "IBM zSeries model z800 and z900"
181 select HAVE_MARCH_Z900_FEATURES if 64BIT
182 help
183 Select this to enable optimizations for model z800/z900 (2064 and
184 2066 series). This will enable some optimizations that are not
185 available on older ESA/390 (31 Bit) only CPUs.
186
187config MARCH_Z990
188 bool "IBM zSeries model z890 and z990"
189 select HAVE_MARCH_Z990_FEATURES if 64BIT
190 help
191 Select this to enable optimizations for model z890/z990 (2084 and
192 2086 series). The kernel will be slightly faster but will not work
193 on older machines.
194
195config MARCH_Z9_109
196 bool "IBM System z9"
197 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
198 help
199 Select this to enable optimizations for IBM System z9 (2094 and
200 2096 series). The kernel will be slightly faster but will not work
201 on older machines.
202
203config MARCH_Z10
204 bool "IBM System z10"
205 select HAVE_MARCH_Z10_FEATURES if 64BIT
206 help
207 Select this to enable optimizations for IBM System z10 (2097 and
208 2098 series). The kernel will be slightly faster but will not work
209 on older machines.
210
211config MARCH_Z196
212 bool "IBM zEnterprise 114 and 196"
213 select HAVE_MARCH_Z196_FEATURES if 64BIT
214 help
215 Select this to enable optimizations for IBM zEnterprise 114 and 196
216 (2818 and 2817 series). The kernel will be slightly faster but will
217 not work on older machines.
218
219endchoice
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800221config 64BIT
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100222 def_bool y
223 prompt "64 bit kernel"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 help
Heiko Carstensdb81a232010-10-29 16:50:36 +0200225 Select this option if you have an IBM z/Architecture machine
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 and want to use the 64 bit addressing mode.
227
Martin Schwidefskyd9f7a742006-09-28 16:55:39 +0200228config 32BIT
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100229 def_bool y if !64BIT
Martin Schwidefskyd9f7a742006-09-28 16:55:39 +0200230
Jan Glauber843c48f2012-08-27 10:55:18 +0200231config COMPAT
232 def_bool y
233 prompt "Kernel support for 31 bit emulation"
234 depends on 64BIT
235 select COMPAT_BINFMT_ELF if BINFMT_ELF
236 select ARCH_WANT_OLD_COMPAT_IPC
237 help
238 Select this option if you want to enable your system kernel to
239 handle system-calls from ELF binaries for 31 bit ESA. This option
240 (and some other stuff like libraries and such) is needed for
241 executing 31 bit applications. It is safe to say "Y".
242
243config SYSVIPC_COMPAT
244 def_bool y if COMPAT && SYSVIPC
245
246config KEYS_COMPAT
247 def_bool y if COMPAT && KEYS
248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249config SMP
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100250 def_bool y
251 prompt "Symmetric multi-processing support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 ---help---
253 This enables support for systems with more than one CPU. If you have
254 a system with only one CPU, like most personal computers, say N. If
255 you have a system with more than one CPU, say Y.
256
257 If you say N here, the kernel will run on single and multiprocessor
258 machines, but will use only one CPU of a multiprocessor machine. If
259 you say Y here, the kernel will run on many, but not all,
260 singleprocessor machines. On a singleprocessor machine, the kernel
261 will run faster if you say N here.
262
Adrian Bunk03502fa2008-02-03 15:50:21 +0200263 See also the SMP-HOWTO available at
264 <http://www.tldp.org/docs.html#howto>.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266 Even if you don't know what to do here, say Y.
267
268config NR_CPUS
269 int "Maximum number of CPUs (2-64)"
270 range 2 64
271 depends on SMP
Heiko Carstens057c5cb2008-02-19 15:29:25 +0100272 default "32" if !64BIT
273 default "64" if 64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 help
275 This allows you to specify the maximum number of CPUs which this
276 kernel will support. The maximum supported value is 64 and the
277 minimum value which makes sense is 2.
278
279 This is purely to save memory - each supported CPU adds
280 approximately sixteen kilobytes to the kernel image.
281
282config HOTPLUG_CPU
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100283 def_bool y
284 prompt "Support for hot-pluggable CPUs"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 depends on SMP
286 select HOTPLUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 help
288 Say Y here to be able to turn CPUs off and on. CPUs
289 can be controlled through /sys/devices/system/cpu/cpu#.
290 Say N if you want to disable CPU hotplug.
291
Heiko Carstens8d11e022010-10-29 16:50:37 +0200292config SCHED_MC
Heiko Carstens83a24e32011-12-27 11:27:09 +0100293 def_bool n
Heiko Carstens8d11e022010-10-29 16:50:37 +0200294
Heiko Carstens4cb14bc2010-08-31 10:28:18 +0200295config SCHED_BOOK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100296 def_bool y
297 prompt "Book scheduler support"
Heiko Carstens83a24e32011-12-27 11:27:09 +0100298 depends on SMP
299 select SCHED_MC
Heiko Carstens4cb14bc2010-08-31 10:28:18 +0200300 help
301 Book scheduler support improves the CPU scheduler's decision making
302 when dealing with machines that have several books.
303
Jan Glauber843c48f2012-08-27 10:55:18 +0200304source kernel/Kconfig.preempt
305
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306config MATHEMU
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100307 def_bool y
308 prompt "IEEE FPU emulation"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 depends on MARCH_G5
310 help
311 This option is required for IEEE compliant floating point arithmetic
Heiko Carstensdb81a232010-10-29 16:50:36 +0200312 on older ESA/390 machines. Say Y unless you know your machine doesn't
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 need this.
314
Jan Glauber843c48f2012-08-27 10:55:18 +0200315source kernel/Kconfig.hz
316
317endmenu
318
319menu "Memory setup"
320
321config ARCH_SPARSEMEM_ENABLE
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100322 def_bool y
Jan Glauber843c48f2012-08-27 10:55:18 +0200323 select SPARSEMEM_VMEMMAP_ENABLE
324 select SPARSEMEM_VMEMMAP
325 select SPARSEMEM_STATIC if !64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Jan Glauber843c48f2012-08-27 10:55:18 +0200327config ARCH_SPARSEMEM_DEFAULT
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100328 def_bool y
Al Viroe65e1fc2006-09-12 03:04:40 -0400329
Jan Glauber843c48f2012-08-27 10:55:18 +0200330config ARCH_SELECT_MEMORY_MODEL
331 def_bool y
Heiko Carstens05445162012-05-14 10:12:41 +0200332
Jan Glauber843c48f2012-08-27 10:55:18 +0200333config ARCH_ENABLE_MEMORY_HOTPLUG
334 def_bool y if SPARSEMEM
Heiko Carstens05445162012-05-14 10:12:41 +0200335
Jan Glauber843c48f2012-08-27 10:55:18 +0200336config ARCH_ENABLE_MEMORY_HOTREMOVE
337 def_bool y
Heiko Carstens05445162012-05-14 10:12:41 +0200338
Jan Glauber843c48f2012-08-27 10:55:18 +0200339config FORCE_MAX_ZONEORDER
340 int
341 default "9"
Heiko Carstens05445162012-05-14 10:12:41 +0200342
Jan Glauber843c48f2012-08-27 10:55:18 +0200343source "mm/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
345config PACK_STACK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100346 def_bool y
347 prompt "Pack kernel stack"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 help
349 This option enables the compiler option -mkernel-backchain if it
350 is available. If the option is available the compiler supports
351 the new stack layout which dramatically reduces the minimum stack
352 frame size. With an old compiler a non-leaf function needs a
353 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
354 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
355 and 24 byte on 64 bit.
356
357 Say Y if you are unsure.
358
359config SMALL_STACK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100360 def_bool n
361 prompt "Use 8kb for kernel stack instead of 16kb"
Heiko Carstens7f5a8ba2008-10-28 11:10:21 +0100362 depends on PACK_STACK && 64BIT && !LOCKDEP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 help
364 If you say Y here and the compiler supports the -mkernel-backchain
Heiko Carstens7f5a8ba2008-10-28 11:10:21 +0100365 option the kernel will use a smaller kernel stack size. The reduced
366 size is 8kb instead of 16kb. This allows to run more threads on a
367 system and reduces the pressure on the memory management for higher
368 order page allocations.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
370 Say N if you are unsure.
371
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372config CHECK_STACK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100373 def_bool y
374 prompt "Detect kernel stack overflow"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 help
376 This option enables the compiler option -mstack-guard and
377 -mstack-size if they are available. If the compiler supports them
378 it will emit additional code to each function prolog to trigger
379 an illegal operation if the kernel stack is about to overflow.
380
381 Say N if you are unsure.
382
383config STACK_GUARD
384 int "Size of the guard area (128-1024)"
385 range 128 1024
386 depends on CHECK_STACK
387 default "256"
388 help
389 This allows you to specify the size of the guard area at the lower
390 end of the kernel stack. If the kernel stack points into the guard
391 area on function entry an illegal operation is triggered. The size
392 needs to be a power of 2. Please keep in mind that the size of an
393 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
394 The minimum size for the stack guard should be 256 for 31 bit and
395 512 for 64 bit.
396
Jan Glauber2c190da2011-03-15 17:08:19 +0100397config WARN_DYNAMIC_STACK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100398 def_bool n
Jan Glauber2c190da2011-03-15 17:08:19 +0100399 prompt "Emit compiler warnings for function with dynamic stack usage"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 help
Jan Glauber2c190da2011-03-15 17:08:19 +0100401 This option enables the compiler option -mwarn-dynamicstack. If the
402 compiler supports this options generates warnings for functions
403 that dynamically allocate stack space using alloca.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
405 Say N if you are unsure.
406
Jan Glauber843c48f2012-08-27 10:55:18 +0200407endmenu
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200408
Jan Glauber843c48f2012-08-27 10:55:18 +0200409menu "I/O subsystem"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411config QDIO
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100412 def_tristate y
413 prompt "QDIO support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 ---help---
Frank Pavlic8129ee12006-01-06 00:19:20 -0800415 This driver provides the Queued Direct I/O base support for
Ursula Braunefca13b2008-04-17 07:46:19 +0200416 IBM System z.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
418 To compile this driver as a module, choose M here: the
419 module will be called qdio.
420
421 If unsure, say Y.
422
Cornelia Huck9d92a7e2008-07-14 09:59:05 +0200423config CHSC_SCH
Sebastian Ottd9c11b12011-01-31 11:30:09 +0100424 def_tristate m
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100425 prompt "Support for CHSC subchannels"
Cornelia Huck9d92a7e2008-07-14 09:59:05 +0200426 help
427 This driver allows usage of CHSC subchannels. A CHSC subchannel
428 is usually present on LPAR only.
429 The driver creates a device /dev/chsc, which may be used to
430 obtain I/O configuration information about the machine and
431 to issue asynchronous chsc commands (DANGEROUS).
432 You will usually only want to use this interface on a special
433 LPAR designated for system management.
434
435 To compile this driver as a module, choose M here: the
436 module will be called chsc_sch.
437
438 If unsure, say N.
439
Sebastian Ott1d1c8f72012-08-28 16:46:26 +0200440config SCM_BUS
441 def_bool y
442 depends on 64BIT
443 prompt "SCM bus driver"
444 help
445 Bus driver for Storage Class Memory.
446
Sebastian Otteadb86a2012-08-28 16:48:16 +0200447config EADM_SCH
448 def_tristate m
449 prompt "Support for EADM subchannels"
450 depends on SCM_BUS
451 help
452 This driver allows usage of EADM subchannels. EADM subchannels act
453 as a communication vehicle for SCM increments.
454
455 To compile this driver as a module, choose M here: the
456 module will be called eadm_sch.
457
Jan Glauber843c48f2012-08-27 10:55:18 +0200458endmenu
459
460menu "Dump support"
461
462config CRASH_DUMP
463 bool "kernel crash dumps"
464 depends on 64BIT && SMP
465 select KEXEC
466 help
467 Generate crash dump after being started by kexec.
468 Crash dump kernels are loaded in the main kernel with kexec-tools
469 into a specially reserved region and then later executed after
470 a crash by kdump/kexec.
471 For more details see Documentation/kdump/kdump.txt
472
473config ZFCPDUMP
474 def_bool n
475 prompt "zfcpdump support"
476 select SMP
477 help
478 Select this option if you want to build an zfcpdump enabled kernel.
479 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
480
481endmenu
482
483menu "Executable file formats / Emulations"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485source "fs/Kconfig.binfmt"
486
Jan Glauber843c48f2012-08-27 10:55:18 +0200487config SECCOMP
488 def_bool y
489 prompt "Enable seccomp to safely compute untrusted bytecode"
490 depends on PROC_FS
491 help
492 This kernel feature is useful for number crunching applications
493 that may need to compute untrusted bytecode during their
494 execution. By using pipes or other transports made available to
495 the process as file descriptors supporting the read/write
496 syscalls, it's possible to isolate those applications in
497 their own address space using seccomp. Once seccomp is
498 enabled via /proc/<pid>/seccomp, it cannot be disabled
499 and the task is only allowed to execute a few safe syscalls
500 defined by each seccomp mode.
501
502 If unsure, say Y.
503
504endmenu
505
506menu "Power Management"
507
508config ARCH_HIBERNATION_POSSIBLE
509 def_bool y if 64BIT
510
511source "kernel/power/Kconfig"
512
513endmenu
514
515source "net/Kconfig"
516
517config PCMCIA
518 def_bool n
519
520config CCW
521 def_bool y
522
523source "drivers/Kconfig"
524
525source "fs/Kconfig"
526
527source "arch/s390/Kconfig.debug"
528
529source "security/Kconfig"
530
531source "crypto/Kconfig"
532
533source "lib/Kconfig"
534
535menu "Virtualization"
Heiko Carstens684de392008-03-05 12:37:14 +0100536
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537config PFAULT
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100538 def_bool y
539 prompt "Pseudo page fault support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 help
541 Select this option, if you want to use PFAULT pseudo page fault
542 handling under VM. If running native or in LPAR, this option
543 has no effect. If your VM does not support PFAULT, PAGEEX
544 pseudo page fault handling will be used.
545 Note that VM 4.2 supports PFAULT but has a bug in its
546 implementation that causes some problems.
547 Everybody who wants to run Linux under VM != VM4.2 should select
548 this option.
549
550config SHARED_KERNEL
Heiko Carstens0eccc782012-09-25 14:53:15 +0200551 bool "VM shared kernel support"
552 depends on !JUMP_LABEL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 help
554 Select this option, if you want to share the text segment of the
555 Linux kernel between different VM guests. This reduces memory
556 usage with lots of guests but greatly increases kernel size.
Heiko Carstens9c9c1762007-03-05 23:35:45 +0100557 Also if a kernel was IPL'ed from a shared segment the kexec system
558 call will not work.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 You should only select this option if you know what you are
560 doing and want to exploit this feature.
561
562config CMM
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100563 def_tristate n
564 prompt "Cooperative memory management"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 help
566 Select this option, if you want to enable the kernel interface
567 to reduce the memory size of the system. This is accomplished
568 by allocating pages of memory and put them "on hold". This only
569 makes sense for a system running under VM where the unused pages
570 will be reused by VM for other guest systems. The interface
571 allows an external monitor to balance memory of many systems.
572 Everybody who wants to run Linux under VM should select this
573 option.
574
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575config CMM_IUCV
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100576 def_bool y
577 prompt "IUCV special message interface to cooperative memory management"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
579 help
580 Select this option to enable the special message interface to
581 the cooperative memory management.
582
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583config APPLDATA_BASE
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100584 def_bool n
585 prompt "Linux - VM Monitor Stream, base infrastructure"
Martin Schwidefskyc185b782008-12-25 13:39:25 +0100586 depends on PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 help
588 This provides a kernel interface for creating and updating z/VM APPLDATA
589 monitor records. The monitor records are updated at certain time
590 intervals, once the timer is started.
591 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
592 i.e. enables or disables monitoring on the Linux side.
593 A custom interval value (in seconds) can be written to
594 /proc/appldata/interval.
595
596 Defaults are 60 seconds interval and timer off.
597 The /proc entries can also be read from, showing the current settings.
598
599config APPLDATA_MEM
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100600 def_tristate m
601 prompt "Monitor memory management statistics"
Al Viro62fb2ba2006-12-13 00:34:59 -0800602 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 help
604 This provides memory management related data to the Linux - VM Monitor
605 Stream, like paging/swapping rate, memory utilisation, etc.
606 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
607 APPLDATA monitor record, i.e. enables or disables monitoring this record
608 on the z/VM side.
609
610 Default is disabled.
611 The /proc entry can also be read from, showing the current settings.
612
613 This can also be compiled as a module, which will be called
614 appldata_mem.o.
615
616config APPLDATA_OS
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100617 def_tristate m
618 prompt "Monitor OS statistics"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 depends on APPLDATA_BASE
620 help
621 This provides OS related data to the Linux - VM Monitor Stream, like
622 CPU utilisation, etc.
623 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
624 APPLDATA monitor record, i.e. enables or disables monitoring this record
625 on the z/VM side.
626
627 Default is disabled.
628 This can also be compiled as a module, which will be called
629 appldata_os.o.
630
631config APPLDATA_NET_SUM
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100632 def_tristate m
633 prompt "Monitor overall network statistics"
Sachin Sant70193af2009-03-26 15:24:00 +0100634 depends on APPLDATA_BASE && NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 help
636 This provides network related data to the Linux - VM Monitor Stream,
637 currently there is only a total sum of network I/O statistics, no
638 per-interface data.
639 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
640 APPLDATA monitor record, i.e. enables or disables monitoring this record
641 on the z/VM side.
642
643 Default is disabled.
644 This can also be compiled as a module, which will be called
645 appldata_net_sum.o.
646
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700647config S390_HYPFS_FS
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100648 def_bool y
649 prompt "s390 hypervisor file system support"
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700650 select SYS_HYPERVISOR
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700651 help
652 This is a virtual file system intended to provide accounting
653 information in an s390 hypervisor environment.
654
Jan Glauber843c48f2012-08-27 10:55:18 +0200655source "arch/s390/kvm/Kconfig"
Michael Holzheu411ed322007-04-27 16:01:49 +0200656
Carsten Ottefa587742008-03-25 18:47:44 +0100657config S390_GUEST
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100658 def_bool y
Cornelia Huckbdd1fc22012-08-27 12:56:48 +0200659 prompt "s390 support for virtio devices (EXPERIMENTAL)"
Carsten Ottefa587742008-03-25 18:47:44 +0100660 depends on 64BIT && EXPERIMENTAL
Christian Borntraeger80629b02011-06-22 16:24:07 +0200661 select VIRTUALIZATION
Carsten Ottefa587742008-03-25 18:47:44 +0100662 select VIRTIO
Christian Borntraegerfaeba8302008-06-20 15:24:18 +0200663 select VIRTIO_CONSOLE
Carsten Ottefa587742008-03-25 18:47:44 +0100664 help
Cornelia Huckbdd1fc22012-08-27 12:56:48 +0200665 Enabling this option adds support for virtio based paravirtual device
666 drivers on s390.
667
Christian Borntraeger20766c02008-08-29 13:30:56 +0200668 Select this option if you want to run the kernel as a guest under
Cornelia Huckbdd1fc22012-08-27 12:56:48 +0200669 the KVM hypervisor.
Heiko Carstensbcf5cef2009-06-12 10:26:26 +0200670
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671endmenu