blob: f068071fcc5d952a0a6c7d745797ea094d7b3999 [file] [log] [blame]
Roman Zippel80daa562008-01-14 04:51:16 +01001config ARCH
2 string
3 option env="ARCH"
4
5config KERNELVERSION
6 string
7 option env="KERNELVERSION"
8
Roman Zippelface4372006-06-08 22:12:45 -07009config DEFCONFIG_LIST
10 string
Paolo 'Blaisorblade' Giarrussob2670eac2006-10-19 23:28:23 -070011 depends on !UML
Roman Zippelface4372006-06-08 22:12:45 -070012 option defconfig_list
13 default "/lib/modules/$UNAME_RELEASE/.config"
14 default "/etc/kernel-config"
15 default "/boot/config-$UNAME_RELEASE"
Sam Ravnborg73531902008-05-25 23:03:18 +020016 default "$ARCH_DEFCONFIG"
Roman Zippelface4372006-06-08 22:12:45 -070017 default "arch/$ARCH/defconfig"
18
Al Boldiff0cfc62007-07-31 00:39:23 -070019menu "General setup"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
21config EXPERIMENTAL
22 bool "Prompt for development and/or incomplete code/drivers"
23 ---help---
24 Some of the various things that Linux supports (such as network
25 drivers, file systems, network protocols, etc.) can be in a state
26 of development where the functionality, stability, or the level of
27 testing is not yet high enough for general use. This is usually
28 known as the "alpha-test" phase among developers. If a feature is
29 currently in alpha-test, then the developers usually discourage
30 uninformed widespread use of this feature by the general public to
31 avoid "Why doesn't this work?" type mail messages. However, active
32 testing and use of these systems is welcomed. Just be aware that it
33 may not meet the normal level of reliability or it may fail to work
34 in some special cases. Detailed bug reports from people familiar
35 with the kernel internals are usually welcomed by the developers
36 (before submitting bug reports, please read the documents
37 <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
38 <file:Documentation/BUG-HUNTING>, and
39 <file:Documentation/oops-tracing.txt> in the kernel source).
40
41 This option will also make obsoleted drivers available. These are
42 drivers that have been replaced by something else, and/or are
43 scheduled to be removed in a future kernel release.
44
45 Unless you intend to help test and develop a feature or driver that
46 falls into this category, or you have a situation that requires
47 using these features, you should probably say N here, which will
48 cause the configurator to present you with fewer choices. If
49 you say Y here, you will be offered the choice of using features or
50 drivers that are currently considered to be in the alpha-test phase.
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052config BROKEN
53 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55config BROKEN_ON_SMP
56 bool
57 depends on BROKEN || !SMP
58 default y
59
60config LOCK_KERNEL
61 bool
62 depends on SMP || PREEMPT
63 default y
64
65config INIT_ENV_ARG_LIMIT
66 int
Adrian Bunkdd673bc2006-06-30 01:55:51 -070067 default 32 if !UML
68 default 128 if UML
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 help
Randy Dunlap34ad92c2005-10-30 15:01:46 -080070 Maximum of each of the number of arguments and environment
71 variables passed to init from the kernel command line.
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74config LOCALVERSION
75 string "Local version - append to kernel release"
76 help
77 Append an extra string to the end of your kernel version.
78 This will show up when you type uname, for example.
79 The string you set here will be appended after the contents of
80 any files with a filename matching localversion* in your
81 object and source tree, in that order. Your total string can
82 be a maximum of 64 characters.
83
Ryan Andersonaaebf432005-07-31 04:57:49 -040084config LOCALVERSION_AUTO
85 bool "Automatically append version information to the version string"
86 default y
87 help
88 This will try to automatically determine if the current tree is a
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020089 release tree by looking for git tags that belong to the current
90 top of tree revision.
Ryan Andersonaaebf432005-07-31 04:57:49 -040091
92 A string of the format -gxxxxxxxx will be added to the localversion
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020093 if a git-based tree is found. The string generated by this will be
Ryan Andersonaaebf432005-07-31 04:57:49 -040094 appended after any matching localversion* files, and after the value
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020095 set in CONFIG_LOCALVERSION.
Ryan Andersonaaebf432005-07-31 04:57:49 -040096
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020097 (The actual string used here is the first eight characters produced
98 by running the command:
99
100 $ git rev-parse --verify HEAD
101
102 which is done within the script "scripts/setlocalversion".)
Ryan Andersonaaebf432005-07-31 04:57:49 -0400103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104config SWAP
105 bool "Support for paging of anonymous memory (swap)"
David Howells93614012006-09-30 20:45:40 +0200106 depends on MMU && BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 default y
108 help
109 This option allows you to choose whether you want to have support
Jesper Juhl92c35042006-01-15 02:40:08 +0100110 for so called swap devices or swap files in your kernel that are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 used to provide more virtual memory than the actual RAM present
112 in your computer. If unsure say Y.
113
114config SYSVIPC
115 bool "System V IPC"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 ---help---
117 Inter Process Communication is a suite of library functions and
118 system calls which let processes (running programs) synchronize and
119 exchange information. It is generally considered to be a good thing,
120 and some programs won't run unless you say Y here. In particular, if
121 you want to run the DOS emulator dosemu under Linux (read the
122 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
123 you'll need to say Y here.
124
125 You can find documentation about IPC with "info ipc" and also in
126 section 6.4 of the Linux Programmer's Guide, available from
127 <http://www.tldp.org/guides.html>.
128
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800129config SYSVIPC_SYSCTL
130 bool
131 depends on SYSVIPC
132 depends on SYSCTL
133 default y
134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135config POSIX_MQUEUE
136 bool "POSIX Message Queues"
137 depends on NET && EXPERIMENTAL
138 ---help---
139 POSIX variant of message queues is a part of IPC. In POSIX message
140 queues every message has a priority which decides about succession
141 of receiving it by a process. If you want to compile and run
142 programs written e.g. for Solaris with use of its POSIX message
Robert P. J. Dayb0e37652007-05-09 07:25:13 +0200143 queues (functions mq_*) say Y here.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145 POSIX message queues are visible as a filesystem called 'mqueue'
146 and can be mounted somewhere if you want to do filesystem
147 operations on message queues.
148
149 If unsure, say Y.
150
151config BSD_PROCESS_ACCT
152 bool "BSD Process Accounting"
153 help
154 If you say Y here, a user level program will be able to instruct the
155 kernel (via a special system call) to write process accounting
156 information to a file: whenever a process exits, information about
157 that process will be appended to the file by the kernel. The
158 information includes things such as creation time, owning user,
159 command name, memory usage, controlling terminal etc. (the complete
160 list is in the struct acct in <file:include/linux/acct.h>). It is
161 up to the user level program to do useful things with this
162 information. This is generally a good idea, so say Y.
163
164config BSD_PROCESS_ACCT_V3
165 bool "BSD Process Accounting version 3 file format"
166 depends on BSD_PROCESS_ACCT
167 default n
168 help
169 If you say Y here, the process accounting information is written
170 in a new file format that also logs the process IDs of each
171 process and it's parent. Note that this file format is incompatible
172 with previous v0/v1/v2 file formats, so you will need updated tools
173 for processing it. A preliminary version of these tools is available
S.Çağlar Onur37a4c942008-06-18 11:45:13 +0300174 at <http://www.gnu.org/software/acct/>.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Shailabh Nagarc7572492006-07-14 00:24:40 -0700176config TASKSTATS
177 bool "Export task/process statistics through netlink (EXPERIMENTAL)"
178 depends on NET
179 default n
180 help
181 Export selected statistics for tasks/processes through the
182 generic netlink interface. Unlike BSD process accounting, the
183 statistics are available during the lifetime of tasks/processes as
184 responses to commands. Like BSD accounting, they are sent to user
185 space on task exit.
186
187 Say N if unsure.
188
Shailabh Nagarca74e922006-07-14 00:24:36 -0700189config TASK_DELAY_ACCT
190 bool "Enable per-task delay accounting (EXPERIMENTAL)"
Shailabh Nagar6f449932006-07-14 00:24:41 -0700191 depends on TASKSTATS
Shailabh Nagarca74e922006-07-14 00:24:36 -0700192 help
193 Collect information on time spent by a task waiting for system
194 resources like cpu, synchronous block I/O completion and swapping
195 in pages. Such statistics can help in setting a task's priorities
196 relative to other tasks for cpu, io, rss limits etc.
197
198 Say N if unsure.
199
Alexey Dobriyan18f705f2007-02-10 01:46:44 -0800200config TASK_XACCT
201 bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
202 depends on TASKSTATS
203 help
204 Collect extended task accounting data and send the data
205 to userland for processing over the taskstats interface.
206
207 Say N if unsure.
208
209config TASK_IO_ACCOUNTING
210 bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
211 depends on TASK_XACCT
212 help
213 Collect information on the number of bytes of storage I/O which this
214 task has caused.
215
216 Say N if unsure.
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218config AUDIT
219 bool "Auditing support"
Chris Wright804a6a492005-05-11 10:52:45 +0100220 depends on NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 help
222 Enable auditing infrastructure that can be used with another
223 kernel subsystem, such as SELinux (which requires this for
224 logging of avc messages output). Does not do system-call
225 auditing without CONFIG_AUDITSYSCALL.
226
227config AUDITSYSCALL
228 bool "Enable system-call auditing support"
Yuichi Nakamura1322b9d2007-11-10 19:21:34 +0900229 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 default y if SECURITY_SELINUX
231 help
232 Enable low-overhead system-call auditing infrastructure that
233 can be used independently or with another kernel subsystem,
Amy Griffisf368c07d2006-04-07 16:55:56 -0400234 such as SELinux. To use audit's filesystem watch feature, please
235 ensure that INOTIFY is configured.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
Al Viro74c3cbe2007-07-22 08:04:18 -0400237config AUDIT_TREE
238 def_bool y
239 depends on AUDITSYSCALL && INOTIFY
240
Mike Travisc903ff82009-01-15 12:28:29 -0800241menu "RCU Subsystem"
242
243choice
244 prompt "RCU Implementation"
245 default CLASSIC_RCU
246
247config CLASSIC_RCU
248 bool "Classic RCU"
249 help
250 This option selects the classic RCU implementation that is
251 designed for best read-side performance on non-realtime
252 systems.
253
254 Select this option if you are unsure.
255
256config TREE_RCU
257 bool "Tree-based hierarchical RCU"
258 help
259 This option selects the RCU implementation that is
260 designed for very large SMP system with hundreds or
261 thousands of CPUs.
262
263config PREEMPT_RCU
264 bool "Preemptible RCU"
265 depends on PREEMPT
266 help
267 This option reduces the latency of the kernel by making certain
268 RCU sections preemptible. Normally RCU code is non-preemptible, if
269 this option is selected then read-only RCU sections become
270 preemptible. This helps latency, but may expose bugs due to
271 now-naive assumptions about each RCU read-side critical section
272 remaining on a given CPU through its execution.
273
274endchoice
275
276config RCU_TRACE
277 bool "Enable tracing for RCU"
278 depends on TREE_RCU || PREEMPT_RCU
279 help
280 This option provides tracing in RCU which presents stats
281 in debugfs for debugging RCU implementation.
282
283 Say Y here if you want to enable RCU tracing
284 Say N if you are unsure.
285
286config RCU_FANOUT
287 int "Tree-based hierarchical RCU fanout value"
288 range 2 64 if 64BIT
289 range 2 32 if !64BIT
290 depends on TREE_RCU
291 default 64 if 64BIT
292 default 32 if !64BIT
293 help
294 This option controls the fanout of hierarchical implementations
295 of RCU, allowing RCU to work efficiently on machines with
296 large numbers of CPUs. This value must be at least the cube
297 root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit
298 systems and up to 262,144 for 64-bit systems.
299
300 Select a specific number if testing RCU itself.
301 Take the default if unsure.
302
303config RCU_FANOUT_EXACT
304 bool "Disable tree-based hierarchical RCU auto-balancing"
305 depends on TREE_RCU
306 default n
307 help
308 This option forces use of the exact RCU_FANOUT value specified,
309 regardless of imbalances in the hierarchy. This is useful for
310 testing RCU itself, and might one day be useful on systems with
311 strong NUMA behavior.
312
313 Without RCU_FANOUT_EXACT, the code will balance the hierarchy.
314
315 Say N if unsure.
316
317config TREE_RCU_TRACE
318 def_bool RCU_TRACE && TREE_RCU
319 select DEBUG_FS
320 help
321 This option provides tracing for the TREE_RCU implementation,
322 permitting Makefile to trivially select kernel/rcutree_trace.c.
323
324config PREEMPT_RCU_TRACE
325 def_bool RCU_TRACE && PREEMPT_RCU
326 select DEBUG_FS
327 help
328 This option provides tracing for the PREEMPT_RCU implementation,
329 permitting Makefile to trivially select kernel/rcupreempt_trace.c.
330
331endmenu # "RCU Subsystem"
332
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333config IKCONFIG
Ross Birof2443ab2006-09-30 23:27:25 -0700334 tristate "Kernel .config support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 ---help---
336 This option enables the complete Linux kernel ".config" file
337 contents to be saved in the kernel. It provides documentation
338 of which kernel options are used in a running kernel or in an
339 on-disk kernel. This information can be extracted from the kernel
340 image file with the script scripts/extract-ikconfig and used as
341 input to rebuild the current kernel or to build another kernel.
342 It can also be extracted from a running kernel by reading
343 /proc/config.gz if enabled (below).
344
345config IKCONFIG_PROC
346 bool "Enable access to .config through /proc/config.gz"
347 depends on IKCONFIG && PROC_FS
348 ---help---
349 This option enables access to the kernel configuration file
350 through /proc/config.gz.
351
Alistair John Strachan794543a2007-05-08 00:31:15 -0700352config LOG_BUF_SHIFT
353 int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
354 range 12 21
Adrian Bunkf17a32e2008-04-29 00:58:58 -0700355 default 17
Alistair John Strachan794543a2007-05-08 00:31:15 -0700356 help
357 Select kernel log buffer size as a power of 2.
Adrian Bunkf17a32e2008-04-29 00:58:58 -0700358 Examples:
359 17 => 128 KB
360 16 => 64 KB
361 15 => 32 KB
362 14 => 16 KB
Alistair John Strachan794543a2007-05-08 00:31:15 -0700363 13 => 8 KB
364 12 => 4 KB
365
KAMEZAWA Hiroyuki5cdc38f2009-01-07 18:07:30 -0800366#
367# Architectures with an unreliable sched_clock() should select this:
368#
369config HAVE_UNSTABLE_SCHED_CLOCK
370 bool
371
372config GROUP_SCHED
373 bool "Group CPU scheduler"
374 depends on EXPERIMENTAL
375 default n
376 help
377 This feature lets CPU scheduler recognize task groups and control CPU
378 bandwidth allocation to such task groups.
379 In order to create a group from arbitrary set of processes, use
380 CONFIG_CGROUPS. (See Control Group support.)
381
382config FAIR_GROUP_SCHED
383 bool "Group scheduling for SCHED_OTHER"
384 depends on GROUP_SCHED
385 default GROUP_SCHED
386
387config RT_GROUP_SCHED
388 bool "Group scheduling for SCHED_RR/FIFO"
389 depends on EXPERIMENTAL
390 depends on GROUP_SCHED
391 default n
392 help
393 This feature lets you explicitly allocate real CPU bandwidth
394 to users or control groups (depending on the "Basis for grouping tasks"
395 setting below. If enabled, it will also make it impossible to
396 schedule realtime tasks for non-root users until you allocate
397 realtime bandwidth for them.
398 See Documentation/scheduler/sched-rt-group.txt for more information.
399
400choice
401 depends on GROUP_SCHED
402 prompt "Basis for grouping tasks"
403 default USER_SCHED
404
405config USER_SCHED
406 bool "user id"
407 help
408 This option will choose userid as the basis for grouping
409 tasks, thus providing equal CPU bandwidth to each user.
410
411config CGROUP_SCHED
412 bool "Control groups"
413 depends on CGROUPS
414 help
415 This option allows you to create arbitrary task groups
416 using the "cgroup" pseudo filesystem and control
417 the cpu bandwidth allocated to each such task group.
Li Zefan45ce80f2009-01-15 13:50:59 -0800418 Refer to Documentation/cgroups/cgroups.txt for more
419 information on "cgroup" pseudo filesystem.
KAMEZAWA Hiroyuki5cdc38f2009-01-07 18:07:30 -0800420
421endchoice
422
Li Zefan23964d22009-01-15 13:50:58 -0800423menuconfig CGROUPS
424 boolean "Control Group support"
Paul Menageddbcc7e2007-10-18 23:39:30 -0700425 help
Li Zefan23964d22009-01-15 13:50:58 -0800426 This option adds support for grouping sets of processes together, for
KAMEZAWA Hiroyuki5cdc38f2009-01-07 18:07:30 -0800427 use with process control subsystems such as Cpusets, CFS, memory
428 controls or device isolation.
429 See
KAMEZAWA Hiroyuki5cdc38f2009-01-07 18:07:30 -0800430 - Documentation/scheduler/sched-design-CFS.txt (CFS)
Li Zefan45ce80f2009-01-15 13:50:59 -0800431 - Documentation/cgroups/ (features for grouping, isolation
432 and resource control)
Paul Menageddbcc7e2007-10-18 23:39:30 -0700433
434 Say N if unsure.
435
Li Zefan23964d22009-01-15 13:50:58 -0800436if CGROUPS
437
Paul Menage006cb992007-10-18 23:39:43 -0700438config CGROUP_DEBUG
439 bool "Example debug cgroup subsystem"
440 depends on CGROUPS
Paul Menage418d7d82008-04-29 01:00:05 -0700441 default n
Paul Menage006cb992007-10-18 23:39:43 -0700442 help
443 This option enables a simple cgroup subsystem that
444 exports useful debugging information about the cgroups
Li Zefan23964d22009-01-15 13:50:58 -0800445 framework.
Paul Menage006cb992007-10-18 23:39:43 -0700446
Li Zefan23964d22009-01-15 13:50:58 -0800447 Say N if unsure.
Paul Menage006cb992007-10-18 23:39:43 -0700448
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700449config CGROUP_NS
Li Zefan23964d22009-01-15 13:50:58 -0800450 bool "Namespace cgroup subsystem"
451 depends on CGROUPS
452 help
453 Provides a simple namespace cgroup subsystem to
454 provide hierarchical naming of sets of namespaces,
455 for instance virtual servers and checkpoint/restart
456 jobs.
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700457
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700458config CGROUP_FREEZER
Li Zefan23964d22009-01-15 13:50:58 -0800459 bool "Freezer cgroup subsystem"
460 depends on CGROUPS
461 help
462 Provides a way to freeze and unfreeze all tasks in a
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700463 cgroup.
464
Serge E. Hallyn08ce5f12008-04-29 01:00:10 -0700465config CGROUP_DEVICE
466 bool "Device controller for cgroups"
467 depends on CGROUPS && EXPERIMENTAL
468 help
469 Provides a cgroup implementing whitelists for devices which
470 a process in the cgroup can mknod or open.
471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472config CPUSETS
473 bool "Cpuset support"
Paul Menage8793d852007-10-18 23:39:39 -0700474 depends on SMP && CGROUPS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700476 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 allow dynamically partitioning a system into sets of CPUs and
478 Memory Nodes and assigning tasks to run only within those sets.
479 This is primarily useful on large SMP or NUMA systems.
480
481 Say N if unsure.
482
Li Zefan23964d22009-01-15 13:50:58 -0800483config PROC_PID_CPUSET
484 bool "Include legacy /proc/<pid>/cpuset file"
485 depends on CPUSETS
486 default y
487
Srivatsa Vaddagirid842de82007-12-02 20:04:49 +0100488config CGROUP_CPUACCT
489 bool "Simple CPU accounting cgroup subsystem"
490 depends on CGROUPS
491 help
492 Provides a simple Resource Controller for monitoring the
Li Zefan23964d22009-01-15 13:50:58 -0800493 total CPU consumed by the tasks in a cgroup.
Srivatsa Vaddagirid842de82007-12-02 20:04:49 +0100494
Pavel Emelianove552b662008-02-07 00:13:49 -0800495config RESOURCE_COUNTERS
496 bool "Resource counters"
497 help
498 This option enables controller independent resource accounting
Li Zefan23964d22009-01-15 13:50:58 -0800499 infrastructure that works with cgroups.
Pavel Emelianove552b662008-02-07 00:13:49 -0800500 depends on CGROUPS
501
Balbir Singh00f0b822008-03-04 14:28:39 -0800502config CGROUP_MEM_RES_CTLR
503 bool "Memory Resource Controller for Control Groups"
504 depends on CGROUPS && RESOURCE_COUNTERS
Balbir Singhcf475ad2008-04-29 01:00:16 -0700505 select MM_OWNER
Balbir Singh00f0b822008-03-04 14:28:39 -0800506 help
KAMEZAWA Hiroyuki84ad6d72008-10-29 14:01:06 -0700507 Provides a memory resource controller that manages both anonymous
508 memory and page cache. (See Documentation/controllers/memory.txt)
Balbir Singh00f0b822008-03-04 14:28:39 -0800509
510 Note that setting this option increases fixed memory overhead
KAMEZAWA Hiroyuki84ad6d72008-10-29 14:01:06 -0700511 associated with each page of memory in the system. By this,
512 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
513 usage tracking struct at boot. Total amount of this is printed out
514 at boot.
Balbir Singh00f0b822008-03-04 14:28:39 -0800515
516 Only enable when you're ok with these trade offs and really
KAMEZAWA Hiroyuki84ad6d72008-10-29 14:01:06 -0700517 sure you need the memory resource controller. Even when you enable
518 this, you can set "cgroup_disable=memory" at your boot option to
519 disable memory resource controller and you can avoid overheads.
Li Zefanc9d54092009-01-07 18:07:35 -0800520 (and lose benefits of memory resource controller)
Balbir Singh00f0b822008-03-04 14:28:39 -0800521
Balbir Singhcf475ad2008-04-29 01:00:16 -0700522 This config option also selects MM_OWNER config option, which
523 could in turn add some fork/exit overhead.
524
KAMEZAWA Hiroyukic0777192009-01-07 18:07:57 -0800525config CGROUP_MEM_RES_CTLR_SWAP
526 bool "Memory Resource Controller Swap Extension(EXPERIMENTAL)"
527 depends on CGROUP_MEM_RES_CTLR && SWAP && EXPERIMENTAL
528 help
529 Add swap management feature to memory resource controller. When you
530 enable this, you can limit mem+swap usage per cgroup. In other words,
531 when you disable this, memory resource controller has no cares to
532 usage of swap...a process can exhaust all of the swap. This extension
533 is useful when you want to avoid exhaustion swap but this itself
534 adds more overheads and consumes memory for remembering information.
535 Especially if you use 32bit system or small memory system, please
536 be careful about enabling this. When memory resource controller
537 is disabled by boot option, this will be automatically disabled and
538 there will be no overhead from this. Even when you set this config=y,
539 if boot option "noswapaccount" is set, swap will not be accounted.
540
Li Zefan23964d22009-01-15 13:50:58 -0800541endif # CGROUPS
KAMEZAWA Hiroyukic0777192009-01-07 18:07:57 -0800542
Li Zefan23964d22009-01-15 13:50:58 -0800543config MM_OWNER
544 bool
KAMEZAWA Hiroyuki5cdc38f2009-01-07 18:07:30 -0800545
Kay Sievers88a22c92006-09-14 11:23:28 +0200546config SYSFS_DEPRECATED
Ingo Molnard47846c2008-03-04 14:54:47 +0100547 bool
548
549config SYSFS_DEPRECATED_V2
Kay Sieversfce3e802008-11-01 14:03:00 +0100550 bool "Create deprecated sysfs layout for older userspace tools"
Randy Dunlap9148fe82007-12-31 10:05:34 -0800551 depends on SYSFS
Kay Sievers88a22c92006-09-14 11:23:28 +0200552 default y
Ingo Molnard47846c2008-03-04 14:54:47 +0100553 select SYSFS_DEPRECATED
Kay Sievers88a22c92006-09-14 11:23:28 +0200554 help
Kay Sieversfce3e802008-11-01 14:03:00 +0100555 This option switches the layout of sysfs to the deprecated
556 version.
Kay Sievers88a22c92006-09-14 11:23:28 +0200557
Kay Sieversfce3e802008-11-01 14:03:00 +0100558 The current sysfs layout features a unified device tree at
559 /sys/devices/, which is able to express a hierarchy between
560 class devices. If the deprecated option is set to Y, the
561 unified device tree is split into a bus device tree at
562 /sys/devices/ and several individual class device trees at
563 /sys/class/. The class and bus devices will be connected by
564 "<subsystem>:<name>" and the "device" links. The "block"
565 class devices, will not show up in /sys/class/block/. Some
566 subsystems will suppress the creation of some devices which
567 depend on the unified device tree.
Kay Sievers88a22c92006-09-14 11:23:28 +0200568
Kay Sieversfce3e802008-11-01 14:03:00 +0100569 This option is not a pure compatibility option that can
570 be safely enabled on newer distributions. It will change the
571 layout of sysfs to the non-extensible deprecated version,
572 and disable some features, which can not be exported without
573 confusing older userspace tools. Since 2007/2008 all major
574 distributions do not enable this option, and ship no tools which
575 depend on the deprecated layout or this option.
576
577 If you are using a new kernel on an older distribution, or use
578 older userspace tools, you might need to say Y here. Do not say Y,
579 if the original kernel, that came with your distribution, has
580 this option set to N.
Kay Sievers88a22c92006-09-14 11:23:28 +0200581
Jens Axboeb86ff9812006-03-23 19:56:55 +0100582config RELAY
583 bool "Kernel->user space relay support (formerly relayfs)"
584 help
585 This option enables support for relay interface support in
586 certain file systems (such as debugfs).
587 It is designed to provide an efficient mechanism for tools and
588 facilities to relay large amounts of data from kernel space to
589 user space.
590
591 If unsure, say N.
592
Pavel Emelyanovc5289a62008-02-08 04:18:19 -0800593config NAMESPACES
594 bool "Namespaces support" if EMBEDDED
595 default !EMBEDDED
596 help
597 Provides the way to make tasks work with different objects using
598 the same id. For example same IPC id may refer to different objects
599 or same user id or pid may refer to different tasks when used in
600 different namespaces.
601
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -0800602config UTS_NS
603 bool "UTS namespace"
604 depends on NAMESPACES
605 help
606 In this namespace tasks see different info provided with the
607 uname() system call
608
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -0800609config IPC_NS
610 bool "IPC namespace"
611 depends on NAMESPACES && SYSVIPC
612 help
613 In this namespace tasks work with IPC ids which correspond to
614 different IPC objects in different namespaces
615
Pavel Emelyanovaee16ce2008-02-08 04:18:23 -0800616config USER_NS
617 bool "User namespace (EXPERIMENTAL)"
618 depends on NAMESPACES && EXPERIMENTAL
619 help
620 This allows containers, i.e. vservers, to use user namespaces
621 to provide different user info for different servers.
622 If unsure, say N.
623
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -0800624config PID_NS
625 bool "PID Namespaces (EXPERIMENTAL)"
626 default n
627 depends on NAMESPACES && EXPERIMENTAL
628 help
Heikki Orsila12d2b8f2008-07-06 15:48:02 +0300629 Support process id namespaces. This allows having multiple
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -0800630 process with the same pid as long as they are in different
631 pid namespaces. This is a building block of containers.
632
633 Unless you want to work with an experimental feature
634 say N here.
635
Matt Helsleyd6eb6332009-01-26 12:25:55 -0800636config NET_NS
637 bool "Network namespace"
638 default n
639 depends on NAMESPACES && EXPERIMENTAL && NET
640 help
641 Allow user space to create what appear to be multiple instances
642 of the network stack.
643
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800644config BLK_DEV_INITRD
645 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
646 depends on BROKEN || !FRV
647 help
648 The initial RAM filesystem is a ramfs which is loaded by the
649 boot loader (loadlin or lilo) and that is mounted as root
650 before the normal boot procedure. It is typically used to
651 load modules needed to mount the "real" root file system,
652 etc. See <file:Documentation/initrd.txt> for details.
653
654 If RAM disk support (BLK_DEV_RAM) is also included, this
655 also enables initial RAM disk (initrd) support and adds
656 15 Kbytes (more on some other architectures) to the kernel size.
657
658 If unsure say Y.
659
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800660if BLK_DEV_INITRD
661
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200662source "usr/Kconfig"
663
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800664endif
665
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800666config CC_OPTIMIZE_FOR_SIZE
Ingo Molnar96fffeb2008-04-28 01:39:43 +0200667 bool "Optimize for size"
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800668 default y
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800669 help
670 Enabling this option will pass "-Os" instead of "-O2" to gcc
671 resulting in a smaller kernel.
672
jkacur775a7222008-07-16 00:31:16 +0200673 If unsure, say Y.
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800674
Randy Dunlap08470622006-09-30 23:28:13 -0700675config SYSCTL
676 bool
677
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678menuconfig EMBEDDED
679 bool "Configure standard kernel features (for small systems)"
680 help
681 This option allows certain base kernel options and settings
682 to be disabled or tweaked. This is for specialized
683 environments which can tolerate a "non-standard" kernel.
684 Only use this if you really know what you are doing.
685
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700686config UID16
687 bool "Enable 16-bit UID system calls" if EMBEDDED
David S. Miller09337f52008-04-26 03:17:12 -0700688 depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION)
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700689 default y
690 help
691 This enables the legacy 16-bit UID syscall wrappers.
692
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700693config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700694 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800695 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700696 select SYSCTL
697 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800698 sys_sysctl uses binary paths that have been found challenging
699 to properly maintain and use. The interface in /proc/sys
700 using paths with ascii names is now the primary path to this
701 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700702
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800703 Almost nothing using the binary sysctl interface so if you are
704 trying to save some space it is probably safe to disable this,
705 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700706
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800707 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700708
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100710 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 default y
712 help
713 Say Y here to let the kernel print out symbolic crash information and
714 symbolic stack backtraces. This increases the size of the kernel
715 somewhat, as all symbols have to be loaded into the kernel image.
716
717config KALLSYMS_ALL
718 bool "Include all symbols in kallsyms"
719 depends on DEBUG_KERNEL && KALLSYMS
720 help
721 Normally kallsyms only contains the symbols of functions, for nicer
722 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200723 symbols too: say Y here to include all symbols, if you need them
724 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725
726 Say N.
727
728config KALLSYMS_EXTRA_PASS
729 bool "Do an extra kallsyms pass"
730 depends on KALLSYMS
731 help
732 If kallsyms is not working correctly, the build will fail with
733 inconsistent kallsyms data. If that occurs, log a bug report and
734 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
735 Always say N here unless you find a bug in kallsyms, which must be
736 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
737 you wait for kallsyms to be fixed.
738
Matt Mackalld59745c2005-05-01 08:59:02 -0700739
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800740config HOTPLUG
741 bool "Support for hot-pluggable devices" if EMBEDDED
742 default y
743 help
744 This option is provided for the case where no hotplug or uevent
745 capabilities is wanted by the kernel. You should only consider
746 disabling this option for embedded systems that do not use modules, a
747 dynamic /dev tree, or dynamic device discovery. Just say Y.
748
Matt Mackalld59745c2005-05-01 08:59:02 -0700749config PRINTK
750 default y
751 bool "Enable support for printk" if EMBEDDED
752 help
753 This option enables normal printk support. Removing it
754 eliminates most of the message strings from the kernel image
755 and makes the kernel more or less silent. As this makes it
756 very difficult to diagnose system problems, saying N here is
757 strongly discouraged.
758
Matt Mackallc8538a72005-05-01 08:59:01 -0700759config BUG
760 bool "BUG() support" if EMBEDDED
761 default y
762 help
763 Disabling this option eliminates support for BUG and WARN, reducing
764 the size of your kernel image and potentially quietly ignoring
765 numerous fatal conditions. You should only consider disabling this
766 option for embedded systems with no facilities for reporting errors.
767 Just say Y.
768
Matt Mackall708e9a72006-01-08 01:05:25 -0800769config ELF_CORE
770 default y
771 bool "Enable ELF core dumps" if EMBEDDED
772 help
773 Enable support for generating core dumps. Disabling saves about 4k.
774
Stas Sergeeve5e1d3c2008-05-07 12:39:56 +0200775config PCSPKR_PLATFORM
776 bool "Enable PC-Speaker support" if EMBEDDED
777 depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES
778 default y
779 help
780 This option allows to disable the internal PC-Speaker
781 support, saving some memory.
782
Ingo Molnar32a93232008-02-06 22:39:44 +0100783config COMPAT_BRK
784 bool "Disable heap randomization"
785 default y
786 help
787 Randomizing heap placement makes heap exploits harder, but it
788 also breaks ancient binaries (including anything libc5 based).
789 This option changes the bootup default to heap randomization
790 disabled, and can be overriden runtime by setting
791 /proc/sys/kernel/randomize_va_space to 2.
792
Ingo Molnar166124f2008-02-09 23:24:09 +0100793 On non-ancient distros (post-2000 ones) N is usually a safe choice.
Ingo Molnar32a93232008-02-06 22:39:44 +0100794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795config BASE_FULL
796 default y
797 bool "Enable full-sized data structures for core" if EMBEDDED
798 help
799 Disabling this option reduces the size of miscellaneous core
800 kernel data structures. This saves memory on small machines,
801 but may reduce performance.
802
803config FUTEX
804 bool "Enable futex support" if EMBEDDED
805 default y
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700806 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 help
808 Disabling this option will cause the kernel to be built without
809 support for "fast userspace mutexes". The resulting kernel may not
810 run glibc-based applications correctly.
811
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700812config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700813 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700814
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815config EPOLL
816 bool "Enable eventpoll support" if EMBEDDED
817 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700818 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 help
820 Disabling this option will cause the kernel to be built without
821 support for epoll family of system calls.
822
Davide Libenzifba2afa2007-05-10 22:23:13 -0700823config SIGNALFD
824 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700825 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700826 default y
827 help
828 Enable the signalfd() system call that allows to receive signals
829 on a file descriptor.
830
831 If unsure, say Y.
832
Davide Libenzib215e282007-05-10 22:23:16 -0700833config TIMERFD
834 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700835 select ANON_INODES
Davide Libenzib215e282007-05-10 22:23:16 -0700836 default y
837 help
838 Enable the timerfd() system call that allows to receive timer
839 events on a file descriptor.
840
841 If unsure, say Y.
842
Davide Libenzie1ad7462007-05-10 22:23:19 -0700843config EVENTFD
844 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700845 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700846 default y
847 help
848 Enable the eventfd() system call that allows to receive both
849 kernel notification (ie. KAIO) or userspace notifications.
850
851 If unsure, say Y.
852
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853config SHMEM
854 bool "Use full shmem filesystem" if EMBEDDED
855 default y
856 depends on MMU
857 help
858 The shmem is an internal filesystem used to manage shared memory.
859 It is backed by swap and manages resource limits. It is also exported
860 to userspace as tmpfs if TMPFS is enabled. Disabling this
861 option replaces shmem and tmpfs with the much simpler ramfs code,
862 which may be appropriate on small systems without swap.
863
Thomas Petazzoniebf3f092008-10-15 22:05:12 -0700864config AIO
865 bool "Enable AIO support" if EMBEDDED
866 default y
867 help
868 This option enables POSIX asynchronous I/O which may by used
869 by some high performance threaded applications. Disabling
870 this option saves about 7k.
871
Christoph Lameterf8891e52006-06-30 01:55:45 -0700872config VM_EVENT_COUNTERS
873 default y
874 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
875 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800876 VM event counters are needed for event counts to be shown.
877 This option allows the disabling of the VM event counters
878 on EMBEDDED systems. /proc/vmstat will only show page counts
879 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700880
Thomas Petazzoni3d137312008-08-19 10:28:24 +0200881config PCI_QUIRKS
882 default y
Geert Uytterhoeven61cfc7e2008-10-22 08:53:25 +0200883 bool "Enable PCI quirk workarounds" if EMBEDDED
884 depends on PCI
Thomas Petazzoni3d137312008-08-19 10:28:24 +0200885 help
886 This enables workarounds for various PCI chipset
887 bugs/quirks. Disable this only if your target machine is
888 unaffected by PCI quirks.
889
Christoph Lameter41ecc552007-05-09 02:32:44 -0700890config SLUB_DEBUG
891 default y
892 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterf6acb632008-04-29 16:16:06 -0700893 depends on SLUB && SYSFS
Christoph Lameter41ecc552007-05-09 02:32:44 -0700894 help
895 SLUB has extensive debug support features. Disabling these can
896 result in significant savings in code size. This also disables
897 SLUB sysfs support. /sys/slab will not exist and there will be
898 no support for cache validation etc.
899
Christoph Lameter81819f02007-05-06 14:49:36 -0700900choice
901 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700902 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700903 help
904 This option allows to select a slab allocator.
905
906config SLAB
907 bool "SLAB"
908 help
909 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700910 well in all environments. It organizes cache hot objects in
Simon Arlott02f56212008-11-05 22:18:19 +0000911 per cpu and per node queues.
Christoph Lameter81819f02007-05-06 14:49:36 -0700912
913config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700914 bool "SLUB (Unqueued Allocator)"
915 help
916 SLUB is a slab allocator that minimizes cache line usage
917 instead of managing queues of cached objects (SLAB approach).
918 Per cpu caching is realized using slabs of objects instead
919 of queues of objects. SLUB can use memory efficiently
Simon Arlott02f56212008-11-05 22:18:19 +0000920 and has enhanced diagnostics. SLUB is the default choice for
921 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700922
923config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700924 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700925 bool "SLOB (Simple Allocator)"
926 help
Matt Mackall37291452008-02-04 22:29:38 -0800927 SLOB replaces the stock allocator with a drastically simpler
928 allocator. SLOB is generally more space efficient but
929 does not perform as well on large systems.
Christoph Lameter81819f02007-05-06 14:49:36 -0700930
931endchoice
932
Mathieu Desnoyers125e5642008-02-02 15:10:36 -0500933config PROFILING
934 bool "Profiling support (EXPERIMENTAL)"
935 help
936 Say Y here to enable the extended profiling support mechanisms used
937 by profilers such as OProfile.
938
Ingo Molnar5f87f112008-07-23 14:15:22 +0200939#
940# Place an empty function call at each tracepoint site. Can be
941# dynamically changed for a probe function.
942#
Mathieu Desnoyers97e1c182008-07-18 12:16:16 -0400943config TRACEPOINTS
Ingo Molnar5f87f112008-07-23 14:15:22 +0200944 bool
Mathieu Desnoyers97e1c182008-07-18 12:16:16 -0400945
Mathieu Desnoyers125e5642008-02-02 15:10:36 -0500946config MARKERS
947 bool "Activate markers"
Mathieu Desnoyersc1df1bd2008-11-14 17:47:39 -0500948 depends on TRACEPOINTS
Mathieu Desnoyers125e5642008-02-02 15:10:36 -0500949 help
950 Place an empty function call at each marker site. Can be
951 dynamically changed for a probe function.
952
Mathieu Desnoyersfb32e032008-02-02 15:10:33 -0500953source "arch/Kconfig"
954
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955endmenu # General setup
956
Dmitry Baryshkovee7e5512008-06-29 14:18:46 +0400957config HAVE_GENERIC_DMA_COHERENT
958 bool
959 default n
960
Linus Torvalds158a9622008-01-02 13:04:48 -0800961config SLABINFO
962 bool
963 depends on PROC_FS
Christoph Lameter0f389ec2008-04-14 18:53:02 +0300964 depends on SLAB || SLUB_DEBUG
Linus Torvalds158a9622008-01-02 13:04:48 -0800965 default y
966
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700967config RT_MUTEXES
968 boolean
969 select PLIST
970
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971config BASE_SMALL
972 int
973 default 0 if BASE_FULL
974 default 1 if !BASE_FULL
975
Jan Engelhardt66da5732007-07-15 23:39:29 -0700976menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 bool "Enable loadable module support"
978 help
979 Kernel modules are small pieces of compiled code which can
980 be inserted in the running kernel, rather than being
981 permanently built into the kernel. You use the "modprobe"
982 tool to add (and sometimes remove) them. If you say Y here,
983 many parts of the kernel can be built as modules (by
984 answering M instead of Y where indicated): this is most
985 useful for infrequently used options which are not required
986 for booting. For more information, see the man pages for
987 modprobe, lsmod, modinfo, insmod and rmmod.
988
989 If you say Y here, you will need to run "make
990 modules_install" to put the modules under /lib/modules/
991 where modprobe can find them (you may need to be root to do
992 this).
993
994 If unsure, say Y.
995
Robert P. J. Day0b0de142008-08-04 13:31:32 -0400996if MODULES
997
Linus Torvalds826e4502008-05-04 17:04:16 -0700998config MODULE_FORCE_LOAD
999 bool "Forced module loading"
Linus Torvalds826e4502008-05-04 17:04:16 -07001000 default n
1001 help
Rusty Russell91e37a72008-05-09 16:25:28 +10001002 Allow loading of modules without version information (ie. modprobe
1003 --force). Forced module loading sets the 'F' (forced) taint flag and
1004 is usually a really bad idea.
Linus Torvalds826e4502008-05-04 17:04:16 -07001005
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006config MODULE_UNLOAD
1007 bool "Module unloading"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 help
1009 Without this option you will not be able to unload any
1010 modules (note that some modules may not be unloadable
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001011 anyway), which makes your kernel smaller, faster
1012 and simpler. If unsure, say Y.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013
1014config MODULE_FORCE_UNLOAD
1015 bool "Forced module unloading"
1016 depends on MODULE_UNLOAD && EXPERIMENTAL
1017 help
1018 This option allows you to force a module to unload, even if the
1019 kernel believes it is unsafe: the kernel will remove the module
1020 without waiting for anyone to stop using it (using the -f option to
1021 rmmod). This is mainly for kernel developers and desperate users.
1022 If unsure, say N.
1023
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +01001025 bool "Module versioning support"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 help
1027 Usually, you have to use modules compiled with your kernel.
1028 Saying Y here makes it sometimes possible to use modules
1029 compiled for different kernels, by adding enough information
1030 to the modules to (hopefully) spot any changes which would
1031 make them incompatible with the kernel you are running. If
1032 unsure, say N.
1033
1034config MODULE_SRCVERSION_ALL
1035 bool "Source checksum for all modules"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 help
1037 Modules which contain a MODULE_VERSION get an extra "srcversion"
1038 field inserted into their modinfo section, which contains a
1039 sum of the source files which made it. This helps maintainers
1040 see exactly which source was used to build a module (since
1041 others sometimes change the module source without updating
1042 the version). With this option, such a "srcversion" field
1043 will be created for all modules. If unsure, say N.
1044
Robert P. J. Day0b0de142008-08-04 13:31:32 -04001045endif # MODULES
1046
Rusty Russell98a79d62008-12-13 21:19:41 +10301047config INIT_ALL_POSSIBLE
1048 bool
1049 help
1050 Back when each arch used to define their own cpu_online_map and
1051 cpu_possible_map, some of them chose to initialize cpu_possible_map
1052 with all 1s, and others with all 0s. When they were centralised,
1053 it was better to provide this option than to break all the archs
1054 and have several arch maintainers persuing me down dark alleys.
1055
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056config STOP_MACHINE
1057 bool
1058 default y
1059 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
1060 help
1061 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +01001062
Jens Axboe3a65dfe2005-11-04 08:43:35 +01001063source "block/Kconfig"
Avi Kivitye98c3202007-10-16 23:27:31 -07001064
1065config PREEMPT_NOTIFIERS
1066 bool
Paul E. McKenneye260be62008-01-25 21:08:24 +01001067