brcm2708: fix kmod-sound-soc-bcm2708-i2s config
[openwrt/svn-archive/archive.git] / config / Config-kernel.in
1 # Copyright (C) 2006-2014 OpenWrt.org
2 #
3 # This is free software, licensed under the GNU General Public License v2.
4 # See /LICENSE for more information.
5 #
6
7 config KERNEL_PRINTK
8 bool "Enable support for printk"
9 default y
10
11 config KERNEL_CRASHLOG
12 bool "Crash logging"
13 depends on !(arm || powerpc || sparc || TARGET_uml)
14 default y
15
16 config KERNEL_SWAP
17 bool "Support for paging of anonymous memory (swap)"
18 default y
19
20 config KERNEL_DEBUG_FS
21 bool "Compile the kernel with debug filesystem enabled"
22 default y
23 help
24 debugfs is a virtual file system that kernel developers use to put
25 debugging files into. Enable this option to be able to read and
26 write to these files. Many common debugging facilities, such as
27 ftrace, require the existence of debugfs.
28
29 config KERNEL_PERF_EVENTS
30 bool
31 default n
32
33 config KERNEL_PROFILING
34 bool "Compile the kernel with profiling enabled"
35 default n
36 select KERNEL_PERF_EVENTS
37 help
38 Enable the extended profiling support mechanisms used by profilers such
39 as OProfile.
40
41 config KERNEL_KALLSYMS
42 bool "Compile the kernel with symbol table information"
43 default y
44 help
45 This will give you more information in stack traces from kernel oopses.
46
47 config KERNEL_FTRACE
48 bool "Compile the kernel with tracing support"
49 depends on !TARGET_uml
50 default n
51
52 config KERNEL_FTRACE_SYSCALLS
53 bool "Trace system calls"
54 depends on KERNEL_FTRACE
55 default n
56
57 config KERNEL_ENABLE_DEFAULT_TRACERS
58 bool "Trace process context switches and events"
59 depends on KERNEL_FTRACE
60 default n
61
62 config KERNEL_FUNCTION_TRACER
63 bool "Function tracer"
64 depends on KERNEL_FTRACE
65 default n
66
67 config KERNEL_FUNCTION_GRAPH_TRACER
68 bool "Function graph tracer"
69 depends on KERNEL_FUNCTION_TRACER
70 default n
71
72 config KERNEL_DYNAMIC_FTRACE
73 bool "Enable/disable function tracing dynamically"
74 depends on KERNEL_FUNCTION_TRACER
75 default n
76
77 config KERNEL_FUNCTION_PROFILER
78 bool "Function profiler"
79 depends on KERNEL_FUNCTION_TRACER
80 default n
81
82 config KERNEL_DEBUG_KERNEL
83 bool
84 default n
85
86 config KERNEL_DEBUG_INFO
87 bool "Compile the kernel with debug information"
88 default y
89 select KERNEL_DEBUG_KERNEL
90 help
91 This will compile your kernel and modules with debug information.
92
93 config KERNEL_DEBUG_LL_UART_NONE
94 bool
95 default n
96 depends on arm
97
98 config KERNEL_DEBUG_LL
99 bool
100 default n
101 depends on arm
102 select KERNEL_DEBUG_LL_UART_NONE
103 help
104 ARM low level debugging.
105
106 config KERNEL_DYNAMIC_DEBUG
107 bool "Compile the kernel with dynamic printk"
108 select KERNEL_DEBUG_FS
109 default n
110 help
111 Compiles debug level messages into the kernel, which would not
112 otherwise be available at runtime. These messages can then be
113 enabled/disabled based on various levels of scope - per source file,
114 function, module, format string, and line number. This mechanism
115 implicitly compiles in all pr_debug() and dev_dbg() calls, which
116 enlarges the kernel text size by about 2%.
117
118 config KERNEL_EARLY_PRINTK
119 bool "Compile the kernel with early printk"
120 default y if TARGET_bcm53xx
121 default n
122 depends on arm
123 select KERNEL_DEBUG_KERNEL
124 select KERNEL_DEBUG_LL if arm
125 help
126 Compile the kernel with early printk support. This is only useful for
127 debugging purposes to send messages over the serial console in early boot.
128 Enable this to debug early boot problems.
129
130 config KERNEL_KPROBES
131 bool "Compile the kernel with kprobes support"
132 default n
133 select KERNEL_FTRACE
134 select KERNEL_PERF_EVENTS
135 help
136 Compiles the kernel with KPROBES support, which allows you to trap
137 at almost any kernel address and execute a callback function.
138 register_kprobe() establishes a probepoint and specifies the
139 callback. Kprobes is useful for kernel debugging, non-intrusive
140 instrumentation and testing.
141 If in doubt, say "N".
142
143 config KERNEL_KPROBE_EVENT
144 bool
145 default y if KERNEL_KPROBES
146
147 config KERNEL_AIO
148 bool "Compile the kernel with asynchronous IO support"
149 default n
150
151 config KERNEL_DIRECT_IO
152 bool "Compile the kernel with direct IO support"
153 default n
154
155 config KERNEL_FHANDLE
156 bool "Compile the kernel with support for fhandle syscalls"
157 default n
158
159 config KERNEL_FANOTIFY
160 bool "Compile the kernel with modern file notification support"
161 default n
162
163 config KERNEL_BLK_DEV_BSG
164 bool "Compile the kernel with SCSI generic v4 support for any block device"
165 default n
166
167 config KERNEL_MAGIC_SYSRQ
168 bool "Compile the kernel with SysRq support"
169 default y
170
171 config KERNEL_COREDUMP
172 bool
173
174 config KERNEL_ELF_CORE
175 bool "Enable process core dump support"
176 select KERNEL_COREDUMP
177 default y
178
179 config KERNEL_PROVE_LOCKING
180 bool "Enable kernel lock checking"
181 select KERNEL_DEBUG_KERNEL
182 default n
183
184 config KERNEL_PRINTK_TIME
185 bool "Enable printk timestamps"
186 default y
187
188 config KERNEL_SLUB_DEBUG
189 bool
190
191 config KERNEL_SLUB_DEBUG_ON
192 bool
193
194 config KERNEL_SLABINFO
195 select KERNEL_SLUB_DEBUG
196 select KERNEL_SLUB_DEBUG_ON
197 bool "Enable /proc slab debug info"
198
199 config KERNEL_PROC_PAGE_MONITOR
200 bool "Enable /proc page monitoring"
201
202 config KERNEL_RELAY
203 bool
204
205 config KERNEL_KEXEC
206 bool "Enable kexec support"
207
208 config USE_RFKILL
209 bool "Enable rfkill support"
210 default RFKILL_SUPPORT
211
212 config USE_SPARSE
213 bool "Enable sparse check during kernel build"
214 default n
215
216 config KERNEL_DEVTMPFS
217 bool "Compile the kernel with device tmpfs enabled"
218 default n
219 help
220 devtmpfs is a simple, kernel-managed /dev filesystem. The kernel creates
221 devices nodes for all registered devices ti simplify boot, but leaves more
222 complex tasks to userspace (e.g. udev).
223
224 if KERNEL_DEVTMPFS
225
226 config KERNEL_DEVTMPFS_MOUNT
227 bool "Automatically mount devtmpfs after root filesystem is mounted"
228 default n
229
230 endif
231
232 #
233 # CGROUP support symbols
234 #
235
236 config KERNEL_CGROUPS
237 bool "Enable kernel cgroups"
238 default n
239
240 if KERNEL_CGROUPS
241
242 config KERNEL_CGROUP_DEBUG
243 bool "Example debug cgroup subsystem"
244 default n
245 help
246 This option enables a simple cgroup subsystem that
247 exports useful debugging information about the cgroups
248 framework.
249
250 config KERNEL_FREEZER
251 bool
252 default y if KERNEL_CGROUP_FREEZER
253
254 config KERNEL_CGROUP_FREEZER
255 bool "Freezer cgroup subsystem"
256 default y
257 help
258 Provides a way to freeze and unfreeze all tasks in a
259 cgroup.
260
261 config KERNEL_CGROUP_DEVICE
262 bool "Device controller for cgroups"
263 default y
264 help
265 Provides a cgroup implementing whitelists for devices which
266 a process in the cgroup can mknod or open.
267
268 config KERNEL_CPUSETS
269 bool "Cpuset support"
270 default n
271 help
272 This option will let you create and manage CPUSETs which
273 allow dynamically partitioning a system into sets of CPUs and
274 Memory Nodes and assigning tasks to run only within those sets.
275 This is primarily useful on large SMP or NUMA systems.
276
277 config KERNEL_PROC_PID_CPUSET
278 bool "Include legacy /proc/<pid>/cpuset file"
279 default n
280 depends on KERNEL_CPUSETS
281
282 config KERNEL_CGROUP_CPUACCT
283 bool "Simple CPU accounting cgroup subsystem"
284 default n
285 help
286 Provides a simple Resource Controller for monitoring the
287 total CPU consumed by the tasks in a cgroup.
288
289 config KERNEL_RESOURCE_COUNTERS
290 bool "Resource counters"
291 default n
292 help
293 This option enables controller independent resource accounting
294 infrastructure that works with cgroups.
295
296 config KERNEL_MM_OWNER
297 bool
298 default y if KERNEL_MEMCG
299
300 config KERNEL_MEMCG
301 bool "Memory Resource Controller for Control Groups"
302 default n
303 depends on KERNEL_RESOURCE_COUNTERS || !LINUX_3_18
304 help
305 Provides a memory resource controller that manages both anonymous
306 memory and page cache. (See Documentation/cgroups/memory.txt)
307
308 Note that setting this option increases fixed memory overhead
309 associated with each page of memory in the system. By this,
310 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
311 usage tracking struct at boot. Total amount of this is printed out
312 at boot.
313
314 Only enable when you're ok with these tradeoffs and really
315 sure you need the memory resource controller. Even when you enable
316 this, you can set "cgroup_disable=memory" at your boot option to
317 disable memory resource controller and you can avoid overheads
318 (but lose benefits of memory resource controller).
319
320 This config option also selects MM_OWNER config option, which
321 could in turn add some fork/exit overhead.
322
323 config KERNEL_MEMCG_SWAP
324 bool "Memory Resource Controller Swap Extension"
325 default n
326 depends on KERNEL_MEMCG
327 help
328 Add swap management feature to memory resource controller. When you
329 enable this, you can limit mem+swap usage per cgroup. In other words,
330 when you disable this, memory resource controller has no cares to
331 usage of swap...a process can exhaust all of the swap. This extension
332 is useful when you want to avoid exhaustion swap but this itself
333 adds more overheads and consumes memory for remembering information.
334 Especially if you use 32bit system or small memory system, please
335 be careful about enabling this. When memory resource controller
336 is disabled by boot option, this will be automatically disabled and
337 there will be no overhead from this. Even when you set this config=y,
338 if boot option "swapaccount=0" is set, swap will not be accounted.
339 Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
340 size is 4096bytes, 512k per 1Gbytes of swap.
341
342 config KERNEL_MEMCG_SWAP_ENABLED
343 bool "Memory Resource Controller Swap Extension enabled by default"
344 default n
345 depends on KERNEL_MEMCG_SWAP
346 help
347 Memory Resource Controller Swap Extension comes with its price in
348 a bigger memory consumption. General purpose distribution kernels
349 which want to enable the feature but keep it disabled by default
350 and let the user enable it by swapaccount boot command line
351 parameter should have this option unselected.
352
353 Those who want to have the feature enabled by default should
354 select this option (if, for some reason, they need to disable it,
355 then swapaccount=0 does the trick).
356
357
358 config KERNEL_MEMCG_KMEM
359 bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
360 default n
361 depends on KERNEL_MEMCG
362 help
363 The Kernel Memory extension for Memory Resource Controller can limit
364 the amount of memory used by kernel objects in the system. Those are
365 fundamentally different from the entities handled by the standard
366 Memory Controller, which are page-based, and can be swapped. Users of
367 the kmem extension can use it to guarantee that no group of processes
368 will ever exhaust kernel resources alone.
369
370 config KERNEL_CGROUP_PERF
371 bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
372 select KERNEL_PERF_EVENTS
373 default n
374 help
375 This option extends the per-cpu mode to restrict monitoring to
376 threads which belong to the cgroup specified and run on the
377 designated cpu.
378
379 menuconfig KERNEL_CGROUP_SCHED
380 bool "Group CPU scheduler"
381 default n
382 help
383 This feature lets CPU scheduler recognize task groups and control CPU
384 bandwidth allocation to such task groups. It uses cgroups to group
385 tasks.
386
387 if KERNEL_CGROUP_SCHED
388
389 config KERNEL_FAIR_GROUP_SCHED
390 bool "Group scheduling for SCHED_OTHER"
391 default n
392
393 config KERNEL_CFS_BANDWIDTH
394 bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED"
395 default n
396 depends on KERNEL_FAIR_GROUP_SCHED
397 help
398 This option allows users to define CPU bandwidth rates (limits) for
399 tasks running within the fair group scheduler. Groups with no limit
400 set are considered to be unconstrained and will run with no
401 restriction.
402 See tip/Documentation/scheduler/sched-bwc.txt for more information.
403
404 config KERNEL_RT_GROUP_SCHED
405 bool "Group scheduling for SCHED_RR/FIFO"
406 default n
407 help
408 This feature lets you explicitly allocate real CPU bandwidth
409 to task groups. If enabled, it will also make it impossible to
410 schedule realtime tasks for non-root users until you allocate
411 realtime bandwidth for them.
412
413 endif
414
415 config KERNEL_BLK_CGROUP
416 bool "Block IO controller"
417 default y
418 help
419 Generic block IO controller cgroup interface. This is the common
420 cgroup interface which should be used by various IO controlling
421 policies.
422
423 Currently, CFQ IO scheduler uses it to recognize task groups and
424 control disk bandwidth allocation (proportional time slice allocation)
425 to such task groups. It is also used by bio throttling logic in
426 block layer to implement upper limit in IO rates on a device.
427
428 This option only enables generic Block IO controller infrastructure.
429 One needs to also enable actual IO controlling logic/policy. For
430 enabling proportional weight division of disk bandwidth in CFQ, set
431 CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
432 CONFIG_BLK_DEV_THROTTLING=y.
433
434 config KERNEL_DEBUG_BLK_CGROUP
435 bool "Enable Block IO controller debugging"
436 default n
437 depends on KERNEL_BLK_CGROUP
438 help
439 Enable some debugging help. Currently it exports additional stat
440 files in a cgroup which can be useful for debugging.
441
442 config KERNEL_NET_CLS_CGROUP
443 bool "Control Group Classifier"
444 default y
445
446 config KERNEL_NETPRIO_CGROUP
447 bool "Network priority cgroup"
448 default y
449
450 endif
451
452 #
453 # Namespace support symbols
454 #
455
456 config KERNEL_NAMESPACES
457 bool "Enable kernel namespaces"
458 default n
459
460 if KERNEL_NAMESPACES
461
462 config KERNEL_UTS_NS
463 bool "UTS namespace"
464 default y
465 help
466 In this namespace, tasks see different info provided
467 with the uname() system call.
468
469 config KERNEL_IPC_NS
470 bool "IPC namespace"
471 default y
472 help
473 In this namespace, tasks work with IPC ids which correspond to
474 different IPC objects in different namespaces.
475
476 config KERNEL_USER_NS
477 bool "User namespace (EXPERIMENTAL)"
478 default y
479 help
480 This allows containers, i.e. vservers, to use user namespaces
481 to provide different user info for different servers.
482
483 config KERNEL_PID_NS
484 bool "PID Namespaces"
485 default y
486 help
487 Support process id namespaces. This allows having multiple
488 processes with the same pid as long as they are in different
489 pid namespaces. This is a building block of containers.
490
491 config KERNEL_NET_NS
492 bool "Network namespace"
493 default y
494 help
495 Allow user space to create what appear to be multiple instances
496 of the network stack.
497
498 endif
499
500 #
501 # LXC related symbols
502 #
503
504 config KERNEL_LXC_MISC
505 bool "Enable miscellaneous LXC related options"
506 default n
507
508 if KERNEL_LXC_MISC
509
510 config KERNEL_DEVPTS_MULTIPLE_INSTANCES
511 bool "Support multiple instances of devpts"
512 default y
513 help
514 Enable support for multiple instances of devpts filesystem.
515 If you want to have isolated PTY namespaces (eg: in containers),
516 say Y here. Otherwise, say N. If enabled, each mount of devpts
517 filesystem with the '-o newinstance' option will create an
518 independent PTY namespace.
519
520 config KERNEL_POSIX_MQUEUE
521 bool "POSIX Message Queues"
522 default y
523 help
524 POSIX variant of message queues is a part of IPC. In POSIX message
525 queues every message has a priority which decides about succession
526 of receiving it by a process. If you want to compile and run
527 programs written e.g. for Solaris with use of its POSIX message
528 queues (functions mq_*) say Y here.
529
530 POSIX message queues are visible as a filesystem called 'mqueue'
531 and can be mounted somewhere if you want to do filesystem
532 operations on message queues.
533
534 endif
535
536 config KERNEL_SECCOMP_FILTER
537 bool
538 default n
539
540 config KERNEL_SECCOMP
541 bool "Enable seccomp support"
542 depends on !(TARGET_uml)
543 select KERNEL_SECCOMP_FILTER
544 default n
545 help
546 Build kernel with support for seccomp.