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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"
16 default "arch/$ARCH/defconfig"
17
Al Boldiff0cfc62007-07-31 00:39:23 -070018menu "General setup"
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20config EXPERIMENTAL
21 bool "Prompt for development and/or incomplete code/drivers"
22 ---help---
23 Some of the various things that Linux supports (such as network
24 drivers, file systems, network protocols, etc.) can be in a state
25 of development where the functionality, stability, or the level of
26 testing is not yet high enough for general use. This is usually
27 known as the "alpha-test" phase among developers. If a feature is
28 currently in alpha-test, then the developers usually discourage
29 uninformed widespread use of this feature by the general public to
30 avoid "Why doesn't this work?" type mail messages. However, active
31 testing and use of these systems is welcomed. Just be aware that it
32 may not meet the normal level of reliability or it may fail to work
33 in some special cases. Detailed bug reports from people familiar
34 with the kernel internals are usually welcomed by the developers
35 (before submitting bug reports, please read the documents
36 <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
37 <file:Documentation/BUG-HUNTING>, and
38 <file:Documentation/oops-tracing.txt> in the kernel source).
39
40 This option will also make obsoleted drivers available. These are
41 drivers that have been replaced by something else, and/or are
42 scheduled to be removed in a future kernel release.
43
44 Unless you intend to help test and develop a feature or driver that
45 falls into this category, or you have a situation that requires
46 using these features, you should probably say N here, which will
47 cause the configurator to present you with fewer choices. If
48 you say Y here, you will be offered the choice of using features or
49 drivers that are currently considered to be in the alpha-test phase.
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051config BROKEN
52 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54config BROKEN_ON_SMP
55 bool
56 depends on BROKEN || !SMP
57 default y
58
59config LOCK_KERNEL
60 bool
61 depends on SMP || PREEMPT
62 default y
63
64config INIT_ENV_ARG_LIMIT
65 int
Adrian Bunkdd673bc2006-06-30 01:55:51 -070066 default 32 if !UML
67 default 128 if UML
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 help
Randy Dunlap34ad92c2005-10-30 15:01:46 -080069 Maximum of each of the number of arguments and environment
70 variables passed to init from the kernel command line.
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73config LOCALVERSION
74 string "Local version - append to kernel release"
75 help
76 Append an extra string to the end of your kernel version.
77 This will show up when you type uname, for example.
78 The string you set here will be appended after the contents of
79 any files with a filename matching localversion* in your
80 object and source tree, in that order. Your total string can
81 be a maximum of 64 characters.
82
Ryan Andersonaaebf432005-07-31 04:57:49 -040083config LOCALVERSION_AUTO
84 bool "Automatically append version information to the version string"
85 default y
86 help
87 This will try to automatically determine if the current tree is a
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020088 release tree by looking for git tags that belong to the current
89 top of tree revision.
Ryan Andersonaaebf432005-07-31 04:57:49 -040090
91 A string of the format -gxxxxxxxx will be added to the localversion
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020092 if a git-based tree is found. The string generated by this will be
Ryan Andersonaaebf432005-07-31 04:57:49 -040093 appended after any matching localversion* files, and after the value
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020094 set in CONFIG_LOCALVERSION.
Ryan Andersonaaebf432005-07-31 04:57:49 -040095
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020096 (The actual string used here is the first eight characters produced
97 by running the command:
98
99 $ git rev-parse --verify HEAD
100
101 which is done within the script "scripts/setlocalversion".)
Ryan Andersonaaebf432005-07-31 04:57:49 -0400102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103config SWAP
104 bool "Support for paging of anonymous memory (swap)"
David Howells93614012006-09-30 20:45:40 +0200105 depends on MMU && BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 default y
107 help
108 This option allows you to choose whether you want to have support
Jesper Juhl92c35042006-01-15 02:40:08 +0100109 for so called swap devices or swap files in your kernel that are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 used to provide more virtual memory than the actual RAM present
111 in your computer. If unsure say Y.
112
113config SYSVIPC
114 bool "System V IPC"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 ---help---
116 Inter Process Communication is a suite of library functions and
117 system calls which let processes (running programs) synchronize and
118 exchange information. It is generally considered to be a good thing,
119 and some programs won't run unless you say Y here. In particular, if
120 you want to run the DOS emulator dosemu under Linux (read the
121 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
122 you'll need to say Y here.
123
124 You can find documentation about IPC with "info ipc" and also in
125 section 6.4 of the Linux Programmer's Guide, available from
126 <http://www.tldp.org/guides.html>.
127
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800128config SYSVIPC_SYSCTL
129 bool
130 depends on SYSVIPC
131 depends on SYSCTL
132 default y
133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134config POSIX_MQUEUE
135 bool "POSIX Message Queues"
136 depends on NET && EXPERIMENTAL
137 ---help---
138 POSIX variant of message queues is a part of IPC. In POSIX message
139 queues every message has a priority which decides about succession
140 of receiving it by a process. If you want to compile and run
141 programs written e.g. for Solaris with use of its POSIX message
Robert P. J. Dayb0e37652007-05-09 07:25:13 +0200142 queues (functions mq_*) say Y here.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144 POSIX message queues are visible as a filesystem called 'mqueue'
145 and can be mounted somewhere if you want to do filesystem
146 operations on message queues.
147
148 If unsure, say Y.
149
150config BSD_PROCESS_ACCT
151 bool "BSD Process Accounting"
152 help
153 If you say Y here, a user level program will be able to instruct the
154 kernel (via a special system call) to write process accounting
155 information to a file: whenever a process exits, information about
156 that process will be appended to the file by the kernel. The
157 information includes things such as creation time, owning user,
158 command name, memory usage, controlling terminal etc. (the complete
159 list is in the struct acct in <file:include/linux/acct.h>). It is
160 up to the user level program to do useful things with this
161 information. This is generally a good idea, so say Y.
162
163config BSD_PROCESS_ACCT_V3
164 bool "BSD Process Accounting version 3 file format"
165 depends on BSD_PROCESS_ACCT
166 default n
167 help
168 If you say Y here, the process accounting information is written
169 in a new file format that also logs the process IDs of each
170 process and it's parent. Note that this file format is incompatible
171 with previous v0/v1/v2 file formats, so you will need updated tools
172 for processing it. A preliminary version of these tools is available
173 at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
174
Shailabh Nagarc7572492006-07-14 00:24:40 -0700175config TASKSTATS
176 bool "Export task/process statistics through netlink (EXPERIMENTAL)"
177 depends on NET
178 default n
179 help
180 Export selected statistics for tasks/processes through the
181 generic netlink interface. Unlike BSD process accounting, the
182 statistics are available during the lifetime of tasks/processes as
183 responses to commands. Like BSD accounting, they are sent to user
184 space on task exit.
185
186 Say N if unsure.
187
Shailabh Nagarca74e922006-07-14 00:24:36 -0700188config TASK_DELAY_ACCT
189 bool "Enable per-task delay accounting (EXPERIMENTAL)"
Shailabh Nagar6f449932006-07-14 00:24:41 -0700190 depends on TASKSTATS
Shailabh Nagarca74e922006-07-14 00:24:36 -0700191 help
192 Collect information on time spent by a task waiting for system
193 resources like cpu, synchronous block I/O completion and swapping
194 in pages. Such statistics can help in setting a task's priorities
195 relative to other tasks for cpu, io, rss limits etc.
196
197 Say N if unsure.
198
Alexey Dobriyan18f705f2007-02-10 01:46:44 -0800199config TASK_XACCT
200 bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
201 depends on TASKSTATS
202 help
203 Collect extended task accounting data and send the data
204 to userland for processing over the taskstats interface.
205
206 Say N if unsure.
207
208config TASK_IO_ACCOUNTING
209 bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
210 depends on TASK_XACCT
211 help
212 Collect information on the number of bytes of storage I/O which this
213 task has caused.
214
215 Say N if unsure.
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217config AUDIT
218 bool "Auditing support"
Chris Wright804a6a492005-05-11 10:52:45 +0100219 depends on NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 help
221 Enable auditing infrastructure that can be used with another
222 kernel subsystem, such as SELinux (which requires this for
223 logging of avc messages output). Does not do system-call
224 auditing without CONFIG_AUDITSYSCALL.
225
226config AUDITSYSCALL
227 bool "Enable system-call auditing support"
Yuichi Nakamura1322b9d2007-11-10 19:21:34 +0900228 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 default y if SECURITY_SELINUX
230 help
231 Enable low-overhead system-call auditing infrastructure that
232 can be used independently or with another kernel subsystem,
Amy Griffisf368c07d2006-04-07 16:55:56 -0400233 such as SELinux. To use audit's filesystem watch feature, please
234 ensure that INOTIFY is configured.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Al Viro74c3cbe2007-07-22 08:04:18 -0400236config AUDIT_TREE
237 def_bool y
238 depends on AUDITSYSCALL && INOTIFY
239
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240config IKCONFIG
Ross Birof2443ab2006-09-30 23:27:25 -0700241 tristate "Kernel .config support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 ---help---
243 This option enables the complete Linux kernel ".config" file
244 contents to be saved in the kernel. It provides documentation
245 of which kernel options are used in a running kernel or in an
246 on-disk kernel. This information can be extracted from the kernel
247 image file with the script scripts/extract-ikconfig and used as
248 input to rebuild the current kernel or to build another kernel.
249 It can also be extracted from a running kernel by reading
250 /proc/config.gz if enabled (below).
251
252config IKCONFIG_PROC
253 bool "Enable access to .config through /proc/config.gz"
254 depends on IKCONFIG && PROC_FS
255 ---help---
256 This option enables access to the kernel configuration file
257 through /proc/config.gz.
258
Alistair John Strachan794543a2007-05-08 00:31:15 -0700259config LOG_BUF_SHIFT
260 int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
261 range 12 21
Adrian Bunkf17a32e2008-04-29 00:58:58 -0700262 default 17
Alistair John Strachan794543a2007-05-08 00:31:15 -0700263 help
264 Select kernel log buffer size as a power of 2.
Adrian Bunkf17a32e2008-04-29 00:58:58 -0700265 Examples:
266 17 => 128 KB
267 16 => 64 KB
268 15 => 32 KB
269 14 => 16 KB
Alistair John Strachan794543a2007-05-08 00:31:15 -0700270 13 => 8 KB
271 12 => 4 KB
272
Paul Menageddbcc7e2007-10-18 23:39:30 -0700273config CGROUPS
274 bool "Control Group support"
275 help
276 This option will let you use process cgroup subsystems
277 such as Cpusets
278
279 Say N if unsure.
280
Paul Menage006cb992007-10-18 23:39:43 -0700281config CGROUP_DEBUG
282 bool "Example debug cgroup subsystem"
283 depends on CGROUPS
Paul Menage418d7d82008-04-29 01:00:05 -0700284 default n
Paul Menage006cb992007-10-18 23:39:43 -0700285 help
286 This option enables a simple cgroup subsystem that
287 exports useful debugging information about the cgroups
288 framework
289
290 Say N if unsure
291
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700292config CGROUP_NS
293 bool "Namespace cgroup subsystem"
294 depends on CGROUPS
295 help
296 Provides a simple namespace cgroup subsystem to
297 provide hierarchical naming of sets of namespaces,
298 for instance virtual servers and checkpoint/restart
299 jobs.
300
Serge E. Hallyn08ce5f12008-04-29 01:00:10 -0700301config CGROUP_DEVICE
302 bool "Device controller for cgroups"
303 depends on CGROUPS && EXPERIMENTAL
304 help
305 Provides a cgroup implementing whitelists for devices which
306 a process in the cgroup can mknod or open.
307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308config CPUSETS
309 bool "Cpuset support"
Paul Menage8793d852007-10-18 23:39:39 -0700310 depends on SMP && CGROUPS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700312 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 allow dynamically partitioning a system into sets of CPUs and
314 Memory Nodes and assigning tasks to run only within those sets.
315 This is primarily useful on large SMP or NUMA systems.
316
317 Say N if unsure.
318
Ingo Molnara5574cf2008-05-05 23:19:50 +0200319#
320# Architectures with an unreliable sched_clock() should select this:
321#
322config HAVE_UNSTABLE_SCHED_CLOCK
323 bool
324
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100325config GROUP_SCHED
326 bool "Group CPU scheduler"
Ingo Molnarde8d5852007-10-15 17:00:09 +0200327 default y
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200328 help
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200329 This feature lets CPU scheduler recognize task groups and control CPU
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +0200330 bandwidth allocation to such task groups.
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200331
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100332config FAIR_GROUP_SCHED
333 bool "Group scheduling for SCHED_OTHER"
334 depends on GROUP_SCHED
335 default y
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200336
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100337config RT_GROUP_SCHED
338 bool "Group scheduling for SCHED_RR/FIFO"
339 depends on EXPERIMENTAL
340 depends on GROUP_SCHED
341 default n
Viktor Radnaib9b158f2008-04-19 19:45:01 +0200342 help
343 This feature lets you explicitly allocate real CPU bandwidth
344 to users or control groups (depending on the "Basis for grouping tasks"
345 setting below. If enabled, it will also make it impossible to
346 schedule realtime tasks for non-root users until you allocate
347 realtime bandwidth for them.
348 See Documentation/sched-rt-group.txt for more information.
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100349
350choice
351 depends on GROUP_SCHED
352 prompt "Basis for grouping tasks"
353 default USER_SCHED
354
355config USER_SCHED
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200356 bool "user id"
357 help
358 This option will choose userid as the basis for grouping
359 tasks, thus providing equal CPU bandwidth to each user.
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200360
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100361config CGROUP_SCHED
Srivatsa Vaddagiri68318b82007-10-18 23:41:03 -0700362 bool "Control groups"
363 depends on CGROUPS
364 help
365 This option allows you to create arbitrary task groups
366 using the "cgroup" pseudo filesystem and control
367 the cpu bandwidth allocated to each such task group.
368 Refer to Documentation/cgroups.txt for more information
369 on "cgroup" pseudo filesystem.
370
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200371endchoice
372
Srivatsa Vaddagirid842de82007-12-02 20:04:49 +0100373config CGROUP_CPUACCT
374 bool "Simple CPU accounting cgroup subsystem"
375 depends on CGROUPS
376 help
377 Provides a simple Resource Controller for monitoring the
378 total CPU consumed by the tasks in a cgroup
379
Pavel Emelianove552b662008-02-07 00:13:49 -0800380config RESOURCE_COUNTERS
381 bool "Resource counters"
382 help
383 This option enables controller independent resource accounting
384 infrastructure that works with cgroups
385 depends on CGROUPS
386
Balbir Singhcf475ad2008-04-29 01:00:16 -0700387config MM_OWNER
388 bool
389
Balbir Singh00f0b822008-03-04 14:28:39 -0800390config CGROUP_MEM_RES_CTLR
391 bool "Memory Resource Controller for Control Groups"
392 depends on CGROUPS && RESOURCE_COUNTERS
Balbir Singhcf475ad2008-04-29 01:00:16 -0700393 select MM_OWNER
Balbir Singh00f0b822008-03-04 14:28:39 -0800394 help
395 Provides a memory resource controller that manages both page cache and
396 RSS memory.
397
398 Note that setting this option increases fixed memory overhead
399 associated with each page of memory in the system by 4/8 bytes
400 and also increases cache misses because struct page on many 64bit
401 systems will not fit into a single cache line anymore.
402
403 Only enable when you're ok with these trade offs and really
404 sure you need the memory resource controller.
405
Balbir Singhcf475ad2008-04-29 01:00:16 -0700406 This config option also selects MM_OWNER config option, which
407 could in turn add some fork/exit overhead.
408
Kay Sievers88a22c92006-09-14 11:23:28 +0200409config SYSFS_DEPRECATED
Ingo Molnard47846c2008-03-04 14:54:47 +0100410 bool
411
412config SYSFS_DEPRECATED_V2
Kay Sievers88a22c92006-09-14 11:23:28 +0200413 bool "Create deprecated sysfs files"
Randy Dunlap9148fe82007-12-31 10:05:34 -0800414 depends on SYSFS
Kay Sievers88a22c92006-09-14 11:23:28 +0200415 default y
Ingo Molnard47846c2008-03-04 14:54:47 +0100416 select SYSFS_DEPRECATED
Kay Sievers88a22c92006-09-14 11:23:28 +0200417 help
418 This option creates deprecated symlinks such as the
419 "device"-link, the <subsystem>:<name>-link, and the
420 "bus"-link. It may also add deprecated key in the
421 uevent environment.
422 None of these features or values should be used today, as
423 they export driver core implementation details to userspace
424 or export properties which can't be kept stable across kernel
425 releases.
426
427 If enabled, this option will also move any device structures
David Sterba3dde6ad2007-05-09 07:12:20 +0200428 that belong to a class, back into the /sys/class hierarchy, in
Greg Kroah-Hartman024440d2008-03-03 14:47:13 -0800429 order to support older versions of udev and some userspace
430 programs.
Kay Sievers88a22c92006-09-14 11:23:28 +0200431
Greg Kroah-Hartman024440d2008-03-03 14:47:13 -0800432 If you are using a distro with the most recent userspace
433 packages, it should be safe to say N here.
Kay Sievers88a22c92006-09-14 11:23:28 +0200434
Paul Menage8793d852007-10-18 23:39:39 -0700435config PROC_PID_CPUSET
436 bool "Include legacy /proc/<pid>/cpuset file"
437 depends on CPUSETS
438 default y
439
Jens Axboeb86ff9812006-03-23 19:56:55 +0100440config RELAY
441 bool "Kernel->user space relay support (formerly relayfs)"
442 help
443 This option enables support for relay interface support in
444 certain file systems (such as debugfs).
445 It is designed to provide an efficient mechanism for tools and
446 facilities to relay large amounts of data from kernel space to
447 user space.
448
449 If unsure, say N.
450
Pavel Emelyanovc5289a62008-02-08 04:18:19 -0800451config NAMESPACES
452 bool "Namespaces support" if EMBEDDED
453 default !EMBEDDED
454 help
455 Provides the way to make tasks work with different objects using
456 the same id. For example same IPC id may refer to different objects
457 or same user id or pid may refer to different tasks when used in
458 different namespaces.
459
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -0800460config UTS_NS
461 bool "UTS namespace"
462 depends on NAMESPACES
463 help
464 In this namespace tasks see different info provided with the
465 uname() system call
466
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -0800467config IPC_NS
468 bool "IPC namespace"
469 depends on NAMESPACES && SYSVIPC
470 help
471 In this namespace tasks work with IPC ids which correspond to
472 different IPC objects in different namespaces
473
Pavel Emelyanovaee16ce2008-02-08 04:18:23 -0800474config USER_NS
475 bool "User namespace (EXPERIMENTAL)"
476 depends on NAMESPACES && EXPERIMENTAL
477 help
478 This allows containers, i.e. vservers, to use user namespaces
479 to provide different user info for different servers.
480 If unsure, say N.
481
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -0800482config PID_NS
483 bool "PID Namespaces (EXPERIMENTAL)"
484 default n
485 depends on NAMESPACES && EXPERIMENTAL
486 help
487 Suport process id namespaces. This allows having multiple
488 process with the same pid as long as they are in different
489 pid namespaces. This is a building block of containers.
490
491 Unless you want to work with an experimental feature
492 say N here.
493
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800494config BLK_DEV_INITRD
495 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
496 depends on BROKEN || !FRV
497 help
498 The initial RAM filesystem is a ramfs which is loaded by the
499 boot loader (loadlin or lilo) and that is mounted as root
500 before the normal boot procedure. It is typically used to
501 load modules needed to mount the "real" root file system,
502 etc. See <file:Documentation/initrd.txt> for details.
503
504 If RAM disk support (BLK_DEV_RAM) is also included, this
505 also enables initial RAM disk (initrd) support and adds
506 15 Kbytes (more on some other architectures) to the kernel size.
507
508 If unsure say Y.
509
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800510if BLK_DEV_INITRD
511
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200512source "usr/Kconfig"
513
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800514endif
515
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800516config CC_OPTIMIZE_FOR_SIZE
Ingo Molnar96fffeb2008-04-28 01:39:43 +0200517 bool "Optimize for size"
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800518 default y
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800519 help
520 Enabling this option will pass "-Os" instead of "-O2" to gcc
521 resulting in a smaller kernel.
522
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800523 If unsure, say N.
524
Randy Dunlap08470622006-09-30 23:28:13 -0700525config SYSCTL
526 bool
527
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528menuconfig EMBEDDED
529 bool "Configure standard kernel features (for small systems)"
530 help
531 This option allows certain base kernel options and settings
532 to be disabled or tweaked. This is for specialized
533 environments which can tolerate a "non-standard" kernel.
534 Only use this if you really know what you are doing.
535
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700536config UID16
537 bool "Enable 16-bit UID system calls" if EMBEDDED
David S. Miller09337f52008-04-26 03:17:12 -0700538 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 -0700539 default y
540 help
541 This enables the legacy 16-bit UID syscall wrappers.
542
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700543config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700544 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800545 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700546 select SYSCTL
547 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800548 sys_sysctl uses binary paths that have been found challenging
549 to properly maintain and use. The interface in /proc/sys
550 using paths with ascii names is now the primary path to this
551 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700552
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800553 Almost nothing using the binary sysctl interface so if you are
554 trying to save some space it is probably safe to disable this,
555 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700556
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800557 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700558
Holger Schurig88f458e2008-04-29 01:02:36 -0700559config SYSCTL_SYSCALL_CHECK
560 bool "Sysctl checks" if EMBEDDED
561 depends on SYSCTL_SYSCALL
562 default y
563 ---help---
564 sys_sysctl uses binary paths that have been found challenging
565 to properly maintain and use. This enables checks that help
566 you to keep things correct.
567
568 If unsure say Y here.
569
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100571 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 default y
573 help
574 Say Y here to let the kernel print out symbolic crash information and
575 symbolic stack backtraces. This increases the size of the kernel
576 somewhat, as all symbols have to be loaded into the kernel image.
577
578config KALLSYMS_ALL
579 bool "Include all symbols in kallsyms"
580 depends on DEBUG_KERNEL && KALLSYMS
581 help
582 Normally kallsyms only contains the symbols of functions, for nicer
583 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200584 symbols too: say Y here to include all symbols, if you need them
585 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
587 Say N.
588
589config KALLSYMS_EXTRA_PASS
590 bool "Do an extra kallsyms pass"
591 depends on KALLSYMS
592 help
593 If kallsyms is not working correctly, the build will fail with
594 inconsistent kallsyms data. If that occurs, log a bug report and
595 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
596 Always say N here unless you find a bug in kallsyms, which must be
597 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
598 you wait for kallsyms to be fixed.
599
Matt Mackalld59745c2005-05-01 08:59:02 -0700600
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800601config HOTPLUG
602 bool "Support for hot-pluggable devices" if EMBEDDED
603 default y
604 help
605 This option is provided for the case where no hotplug or uevent
606 capabilities is wanted by the kernel. You should only consider
607 disabling this option for embedded systems that do not use modules, a
608 dynamic /dev tree, or dynamic device discovery. Just say Y.
609
Matt Mackalld59745c2005-05-01 08:59:02 -0700610config PRINTK
611 default y
612 bool "Enable support for printk" if EMBEDDED
613 help
614 This option enables normal printk support. Removing it
615 eliminates most of the message strings from the kernel image
616 and makes the kernel more or less silent. As this makes it
617 very difficult to diagnose system problems, saying N here is
618 strongly discouraged.
619
Matt Mackallc8538a72005-05-01 08:59:01 -0700620config BUG
621 bool "BUG() support" if EMBEDDED
622 default y
623 help
624 Disabling this option eliminates support for BUG and WARN, reducing
625 the size of your kernel image and potentially quietly ignoring
626 numerous fatal conditions. You should only consider disabling this
627 option for embedded systems with no facilities for reporting errors.
628 Just say Y.
629
Matt Mackall708e9a72006-01-08 01:05:25 -0800630config ELF_CORE
631 default y
632 bool "Enable ELF core dumps" if EMBEDDED
633 help
634 Enable support for generating core dumps. Disabling saves about 4k.
635
Ingo Molnar32a93232008-02-06 22:39:44 +0100636config COMPAT_BRK
637 bool "Disable heap randomization"
638 default y
639 help
640 Randomizing heap placement makes heap exploits harder, but it
641 also breaks ancient binaries (including anything libc5 based).
642 This option changes the bootup default to heap randomization
643 disabled, and can be overriden runtime by setting
644 /proc/sys/kernel/randomize_va_space to 2.
645
Ingo Molnar166124f2008-02-09 23:24:09 +0100646 On non-ancient distros (post-2000 ones) N is usually a safe choice.
Ingo Molnar32a93232008-02-06 22:39:44 +0100647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648config BASE_FULL
649 default y
650 bool "Enable full-sized data structures for core" if EMBEDDED
651 help
652 Disabling this option reduces the size of miscellaneous core
653 kernel data structures. This saves memory on small machines,
654 but may reduce performance.
655
656config FUTEX
657 bool "Enable futex support" if EMBEDDED
658 default y
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700659 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 help
661 Disabling this option will cause the kernel to be built without
662 support for "fast userspace mutexes". The resulting kernel may not
663 run glibc-based applications correctly.
664
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700665config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700666 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700667
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668config EPOLL
669 bool "Enable eventpoll support" if EMBEDDED
670 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700671 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 help
673 Disabling this option will cause the kernel to be built without
674 support for epoll family of system calls.
675
Davide Libenzifba2afa2007-05-10 22:23:13 -0700676config SIGNALFD
677 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700678 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700679 default y
680 help
681 Enable the signalfd() system call that allows to receive signals
682 on a file descriptor.
683
684 If unsure, say Y.
685
Davide Libenzib215e282007-05-10 22:23:16 -0700686config TIMERFD
687 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700688 select ANON_INODES
Davide Libenzib215e282007-05-10 22:23:16 -0700689 default y
690 help
691 Enable the timerfd() system call that allows to receive timer
692 events on a file descriptor.
693
694 If unsure, say Y.
695
Davide Libenzie1ad7462007-05-10 22:23:19 -0700696config EVENTFD
697 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700698 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700699 default y
700 help
701 Enable the eventfd() system call that allows to receive both
702 kernel notification (ie. KAIO) or userspace notifications.
703
704 If unsure, say Y.
705
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706config SHMEM
707 bool "Use full shmem filesystem" if EMBEDDED
708 default y
709 depends on MMU
710 help
711 The shmem is an internal filesystem used to manage shared memory.
712 It is backed by swap and manages resource limits. It is also exported
713 to userspace as tmpfs if TMPFS is enabled. Disabling this
714 option replaces shmem and tmpfs with the much simpler ramfs code,
715 which may be appropriate on small systems without swap.
716
Christoph Lameterf8891e52006-06-30 01:55:45 -0700717config VM_EVENT_COUNTERS
718 default y
719 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
720 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800721 VM event counters are needed for event counts to be shown.
722 This option allows the disabling of the VM event counters
723 on EMBEDDED systems. /proc/vmstat will only show page counts
724 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700725
Christoph Lameter41ecc552007-05-09 02:32:44 -0700726config SLUB_DEBUG
727 default y
728 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterf6acb632008-04-29 16:16:06 -0700729 depends on SLUB && SYSFS
Christoph Lameter41ecc552007-05-09 02:32:44 -0700730 help
731 SLUB has extensive debug support features. Disabling these can
732 result in significant savings in code size. This also disables
733 SLUB sysfs support. /sys/slab will not exist and there will be
734 no support for cache validation etc.
735
Christoph Lameter81819f02007-05-06 14:49:36 -0700736choice
737 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700738 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700739 help
740 This option allows to select a slab allocator.
741
742config SLAB
743 bool "SLAB"
744 help
745 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700746 well in all environments. It organizes cache hot objects in
Christoph Lameter81819f02007-05-06 14:49:36 -0700747 per cpu and per node queues. SLAB is the default choice for
Christoph Lameter34013882007-05-09 02:32:47 -0700748 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700749
750config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700751 bool "SLUB (Unqueued Allocator)"
752 help
753 SLUB is a slab allocator that minimizes cache line usage
754 instead of managing queues of cached objects (SLAB approach).
755 Per cpu caching is realized using slabs of objects instead
756 of queues of objects. SLUB can use memory efficiently
Christoph Lameter34013882007-05-09 02:32:47 -0700757 and has enhanced diagnostics.
Christoph Lameter81819f02007-05-06 14:49:36 -0700758
759config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700760 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700761 bool "SLOB (Simple Allocator)"
762 help
Matt Mackall37291452008-02-04 22:29:38 -0800763 SLOB replaces the stock allocator with a drastically simpler
764 allocator. SLOB is generally more space efficient but
765 does not perform as well on large systems.
Christoph Lameter81819f02007-05-06 14:49:36 -0700766
767endchoice
768
Mathieu Desnoyers125e5642008-02-02 15:10:36 -0500769config PROFILING
770 bool "Profiling support (EXPERIMENTAL)"
771 help
772 Say Y here to enable the extended profiling support mechanisms used
773 by profilers such as OProfile.
774
775config MARKERS
776 bool "Activate markers"
777 help
778 Place an empty function call at each marker site. Can be
779 dynamically changed for a probe function.
780
Mathieu Desnoyersfb32e032008-02-02 15:10:33 -0500781source "arch/Kconfig"
782
Matt Mackall1e883282008-02-04 22:29:07 -0800783config PROC_PAGE_MONITOR
784 default y
785 depends on PROC_FS && MMU
786 bool "Enable /proc page monitoring" if EMBEDDED
787 help
788 Various /proc files exist to monitor process memory utilization:
789 /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
790 /proc/kpagecount, and /proc/kpageflags. Disabling these
791 interfaces will reduce the size of the kernel by approximately 4kb.
792
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793endmenu # General setup
794
Linus Torvalds158a9622008-01-02 13:04:48 -0800795config SLABINFO
796 bool
797 depends on PROC_FS
Christoph Lameter0f389ec2008-04-14 18:53:02 +0300798 depends on SLAB || SLUB_DEBUG
Linus Torvalds158a9622008-01-02 13:04:48 -0800799 default y
800
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700801config RT_MUTEXES
802 boolean
803 select PLIST
804
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805config TINY_SHMEM
806 default !SHMEM
807 bool
808
809config BASE_SMALL
810 int
811 default 0 if BASE_FULL
812 default 1 if !BASE_FULL
813
Jan Engelhardt66da5732007-07-15 23:39:29 -0700814menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 bool "Enable loadable module support"
816 help
817 Kernel modules are small pieces of compiled code which can
818 be inserted in the running kernel, rather than being
819 permanently built into the kernel. You use the "modprobe"
820 tool to add (and sometimes remove) them. If you say Y here,
821 many parts of the kernel can be built as modules (by
822 answering M instead of Y where indicated): this is most
823 useful for infrequently used options which are not required
824 for booting. For more information, see the man pages for
825 modprobe, lsmod, modinfo, insmod and rmmod.
826
827 If you say Y here, you will need to run "make
828 modules_install" to put the modules under /lib/modules/
829 where modprobe can find them (you may need to be root to do
830 this).
831
832 If unsure, say Y.
833
Linus Torvalds826e4502008-05-04 17:04:16 -0700834config MODULE_FORCE_LOAD
835 bool "Forced module loading"
836 depends on MODULES
837 default n
838 help
839 This option allows loading of modules even if that would set the
840 'F' (forced) taint, due to lack of version info. Which is
841 usually a really bad idea.
842
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843config MODULE_UNLOAD
844 bool "Module unloading"
845 depends on MODULES
846 help
847 Without this option you will not be able to unload any
848 modules (note that some modules may not be unloadable
849 anyway), which makes your kernel slightly smaller and
850 simpler. If unsure, say Y.
851
852config MODULE_FORCE_UNLOAD
853 bool "Forced module unloading"
854 depends on MODULE_UNLOAD && EXPERIMENTAL
855 help
856 This option allows you to force a module to unload, even if the
857 kernel believes it is unsafe: the kernel will remove the module
858 without waiting for anyone to stop using it (using the -f option to
859 rmmod). This is mainly for kernel developers and desperate users.
860 If unsure, say N.
861
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100863 bool "Module versioning support"
864 depends on MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 help
866 Usually, you have to use modules compiled with your kernel.
867 Saying Y here makes it sometimes possible to use modules
868 compiled for different kernels, by adding enough information
869 to the modules to (hopefully) spot any changes which would
870 make them incompatible with the kernel you are running. If
871 unsure, say N.
872
873config MODULE_SRCVERSION_ALL
874 bool "Source checksum for all modules"
875 depends on MODULES
876 help
877 Modules which contain a MODULE_VERSION get an extra "srcversion"
878 field inserted into their modinfo section, which contains a
879 sum of the source files which made it. This helps maintainers
880 see exactly which source was used to build a module (since
881 others sometimes change the module source without updating
882 the version). With this option, such a "srcversion" field
883 will be created for all modules. If unsure, say N.
884
885config KMOD
886 bool "Automatic kernel module loading"
887 depends on MODULES
888 help
889 Normally when you have selected some parts of the kernel to
890 be created as kernel modules, you must load them (using the
891 "modprobe" command) before you can use them. If you say Y
892 here, some parts of the kernel will be able to load modules
893 automatically: when a part of the kernel needs a module, it
894 runs modprobe with the appropriate arguments, thereby
895 loading the module if it is available. If unsure, say Y.
896
897config STOP_MACHINE
898 bool
899 default y
900 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
901 help
902 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100903
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100904source "block/Kconfig"
Avi Kivitye98c3202007-10-16 23:27:31 -0700905
906config PREEMPT_NOTIFIERS
907 bool
Paul E. McKenneye260be62008-01-25 21:08:24 +0100908
Paul E. McKenneye260be62008-01-25 21:08:24 +0100909config CLASSIC_RCU
Paul E. McKenney21bbb392008-03-10 11:43:57 -0700910 def_bool !PREEMPT_RCU
Paul E. McKenneye260be62008-01-25 21:08:24 +0100911 help
912 This option selects the classic RCU implementation that is
913 designed for best read-side performance on non-realtime
Paul E. McKenney21bbb392008-03-10 11:43:57 -0700914 systems. Classic RCU is the default. Note that the
915 PREEMPT_RCU symbol is used to select/deselect this option.