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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' Giarrussob2670ea2006-10-19 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42 drivers that have been replaced by something else, and/or are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 Wright804a6a42005-05-11 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241config IKCONFIG
Ross Birof2443ab2006-09-30 23:27:25 -0700242 tristate "Kernel .config support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 ---help---
244 This option enables the complete Linux kernel ".config" file
245 contents to be saved in the kernel. It provides documentation
246 of which kernel options are used in a running kernel or in an
247 on-disk kernel. This information can be extracted from the kernel
248 image file with the script scripts/extract-ikconfig and used as
249 input to rebuild the current kernel or to build another kernel.
250 It can also be extracted from a running kernel by reading
251 /proc/config.gz if enabled (below).
252
253config IKCONFIG_PROC
254 bool "Enable access to .config through /proc/config.gz"
255 depends on IKCONFIG && PROC_FS
256 ---help---
257 This option enables access to the kernel configuration file
258 through /proc/config.gz.
259
Alistair John Strachan794543a2007-05-08 00:31:15 -0700260config LOG_BUF_SHIFT
261 int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
262 range 12 21
Adrian Bunkf17a32e2008-04-29 00:58:58 -0700263 default 17
Alistair John Strachan794543a2007-05-08 00:31:15 -0700264 help
265 Select kernel log buffer size as a power of 2.
Adrian Bunkf17a32e2008-04-29 00:58:58 -0700266 Examples:
267 17 => 128 KB
268 16 => 64 KB
269 15 => 32 KB
270 14 => 16 KB
Alistair John Strachan794543a2007-05-08 00:31:15 -0700271 13 => 8 KB
272 12 => 4 KB
273
Paul Menageddbcc7e2007-10-18 23:39:30 -0700274config CGROUPS
275 bool "Control Group support"
276 help
277 This option will let you use process cgroup subsystems
278 such as Cpusets
279
280 Say N if unsure.
281
Paul Menage006cb992007-10-18 23:39:43 -0700282config CGROUP_DEBUG
283 bool "Example debug cgroup subsystem"
284 depends on CGROUPS
Paul Menage418d7d82008-04-29 01:00:05 -0700285 default n
Paul Menage006cb992007-10-18 23:39:43 -0700286 help
287 This option enables a simple cgroup subsystem that
288 exports useful debugging information about the cgroups
289 framework
290
291 Say N if unsure
292
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700293config CGROUP_NS
294 bool "Namespace cgroup subsystem"
295 depends on CGROUPS
296 help
297 Provides a simple namespace cgroup subsystem to
298 provide hierarchical naming of sets of namespaces,
299 for instance virtual servers and checkpoint/restart
300 jobs.
301
Serge E. Hallyn08ce5f12008-04-29 01:00:10 -0700302config CGROUP_DEVICE
303 bool "Device controller for cgroups"
304 depends on CGROUPS && EXPERIMENTAL
305 help
306 Provides a cgroup implementing whitelists for devices which
307 a process in the cgroup can mknod or open.
308
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309config CPUSETS
310 bool "Cpuset support"
Paul Menage8793d852007-10-18 23:39:39 -0700311 depends on SMP && CGROUPS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700313 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 allow dynamically partitioning a system into sets of CPUs and
315 Memory Nodes and assigning tasks to run only within those sets.
316 This is primarily useful on large SMP or NUMA systems.
317
318 Say N if unsure.
319
Ingo Molnara5574cf2008-05-05 23:19:50 +0200320#
321# Architectures with an unreliable sched_clock() should select this:
322#
323config HAVE_UNSTABLE_SCHED_CLOCK
324 bool
325
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100326config GROUP_SCHED
327 bool "Group CPU scheduler"
Parag Warudkaraac6abc2008-05-03 20:42:34 -0400328 depends on EXPERIMENTAL
329 default n
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200330 help
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200331 This feature lets CPU scheduler recognize task groups and control CPU
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +0200332 bandwidth allocation to such task groups.
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200333
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100334config FAIR_GROUP_SCHED
335 bool "Group scheduling for SCHED_OTHER"
336 depends on GROUP_SCHED
Parag Warudkaraac6abc2008-05-03 20:42:34 -0400337 default GROUP_SCHED
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200338
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100339config RT_GROUP_SCHED
340 bool "Group scheduling for SCHED_RR/FIFO"
341 depends on EXPERIMENTAL
342 depends on GROUP_SCHED
343 default n
Viktor Radnaib9b158f2008-04-19 19:45:01 +0200344 help
345 This feature lets you explicitly allocate real CPU bandwidth
346 to users or control groups (depending on the "Basis for grouping tasks"
347 setting below. If enabled, it will also make it impossible to
348 schedule realtime tasks for non-root users until you allocate
349 realtime bandwidth for them.
350 See Documentation/sched-rt-group.txt for more information.
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100351
352choice
353 depends on GROUP_SCHED
354 prompt "Basis for grouping tasks"
355 default USER_SCHED
356
357config USER_SCHED
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200358 bool "user id"
359 help
360 This option will choose userid as the basis for grouping
361 tasks, thus providing equal CPU bandwidth to each user.
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200362
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100363config CGROUP_SCHED
Srivatsa Vaddagiri68318b82007-10-18 23:41:03 -0700364 bool "Control groups"
365 depends on CGROUPS
366 help
367 This option allows you to create arbitrary task groups
368 using the "cgroup" pseudo filesystem and control
369 the cpu bandwidth allocated to each such task group.
370 Refer to Documentation/cgroups.txt for more information
371 on "cgroup" pseudo filesystem.
372
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200373endchoice
374
Srivatsa Vaddagirid842de82007-12-02 20:04:49 +0100375config CGROUP_CPUACCT
376 bool "Simple CPU accounting cgroup subsystem"
377 depends on CGROUPS
378 help
379 Provides a simple Resource Controller for monitoring the
380 total CPU consumed by the tasks in a cgroup
381
Pavel Emelianove552b662008-02-07 00:13:49 -0800382config RESOURCE_COUNTERS
383 bool "Resource counters"
384 help
385 This option enables controller independent resource accounting
386 infrastructure that works with cgroups
387 depends on CGROUPS
388
Balbir Singhcf475ad2008-04-29 01:00:16 -0700389config MM_OWNER
390 bool
391
Balbir Singh00f0b822008-03-04 14:28:39 -0800392config CGROUP_MEM_RES_CTLR
393 bool "Memory Resource Controller for Control Groups"
394 depends on CGROUPS && RESOURCE_COUNTERS
Balbir Singhcf475ad2008-04-29 01:00:16 -0700395 select MM_OWNER
Balbir Singh00f0b822008-03-04 14:28:39 -0800396 help
397 Provides a memory resource controller that manages both page cache and
398 RSS memory.
399
400 Note that setting this option increases fixed memory overhead
401 associated with each page of memory in the system by 4/8 bytes
402 and also increases cache misses because struct page on many 64bit
403 systems will not fit into a single cache line anymore.
404
405 Only enable when you're ok with these trade offs and really
406 sure you need the memory resource controller.
407
Balbir Singhcf475ad2008-04-29 01:00:16 -0700408 This config option also selects MM_OWNER config option, which
409 could in turn add some fork/exit overhead.
410
Kay Sievers88a22c92006-09-14 11:23:28 +0200411config SYSFS_DEPRECATED
Ingo Molnard47846c2008-03-04 14:54:47 +0100412 bool
413
414config SYSFS_DEPRECATED_V2
Kay Sievers88a22c92006-09-14 11:23:28 +0200415 bool "Create deprecated sysfs files"
Randy Dunlap9148fe82007-12-31 10:05:34 -0800416 depends on SYSFS
Kay Sievers88a22c92006-09-14 11:23:28 +0200417 default y
Ingo Molnard47846c2008-03-04 14:54:47 +0100418 select SYSFS_DEPRECATED
Kay Sievers88a22c92006-09-14 11:23:28 +0200419 help
420 This option creates deprecated symlinks such as the
421 "device"-link, the <subsystem>:<name>-link, and the
422 "bus"-link. It may also add deprecated key in the
423 uevent environment.
424 None of these features or values should be used today, as
425 they export driver core implementation details to userspace
426 or export properties which can't be kept stable across kernel
427 releases.
428
429 If enabled, this option will also move any device structures
David Sterba3dde6ad2007-05-09 07:12:20 +0200430 that belong to a class, back into the /sys/class hierarchy, in
Greg Kroah-Hartman024440d2008-03-03 14:47:13 -0800431 order to support older versions of udev and some userspace
432 programs.
Kay Sievers88a22c92006-09-14 11:23:28 +0200433
Greg Kroah-Hartman024440d2008-03-03 14:47:13 -0800434 If you are using a distro with the most recent userspace
435 packages, it should be safe to say N here.
Kay Sievers88a22c92006-09-14 11:23:28 +0200436
Paul Menage8793d852007-10-18 23:39:39 -0700437config PROC_PID_CPUSET
438 bool "Include legacy /proc/<pid>/cpuset file"
439 depends on CPUSETS
440 default y
441
Jens Axboeb86ff982006-03-23 19:56:55 +0100442config RELAY
443 bool "Kernel->user space relay support (formerly relayfs)"
444 help
445 This option enables support for relay interface support in
446 certain file systems (such as debugfs).
447 It is designed to provide an efficient mechanism for tools and
448 facilities to relay large amounts of data from kernel space to
449 user space.
450
451 If unsure, say N.
452
Pavel Emelyanovc5289a62008-02-08 04:18:19 -0800453config NAMESPACES
454 bool "Namespaces support" if EMBEDDED
455 default !EMBEDDED
456 help
457 Provides the way to make tasks work with different objects using
458 the same id. For example same IPC id may refer to different objects
459 or same user id or pid may refer to different tasks when used in
460 different namespaces.
461
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -0800462config UTS_NS
463 bool "UTS namespace"
464 depends on NAMESPACES
465 help
466 In this namespace tasks see different info provided with the
467 uname() system call
468
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -0800469config IPC_NS
470 bool "IPC namespace"
471 depends on NAMESPACES && SYSVIPC
472 help
473 In this namespace tasks work with IPC ids which correspond to
474 different IPC objects in different namespaces
475
Pavel Emelyanovaee16ce2008-02-08 04:18:23 -0800476config USER_NS
477 bool "User namespace (EXPERIMENTAL)"
478 depends on NAMESPACES && EXPERIMENTAL
479 help
480 This allows containers, i.e. vservers, to use user namespaces
481 to provide different user info for different servers.
482 If unsure, say N.
483
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -0800484config PID_NS
485 bool "PID Namespaces (EXPERIMENTAL)"
486 default n
487 depends on NAMESPACES && EXPERIMENTAL
488 help
Heikki Orsila12d2b8f2008-07-06 15:48:02 +0300489 Support process id namespaces. This allows having multiple
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -0800490 process with the same pid as long as they are in different
491 pid namespaces. This is a building block of containers.
492
493 Unless you want to work with an experimental feature
494 say N here.
495
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800496config BLK_DEV_INITRD
497 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
498 depends on BROKEN || !FRV
499 help
500 The initial RAM filesystem is a ramfs which is loaded by the
501 boot loader (loadlin or lilo) and that is mounted as root
502 before the normal boot procedure. It is typically used to
503 load modules needed to mount the "real" root file system,
504 etc. See <file:Documentation/initrd.txt> for details.
505
506 If RAM disk support (BLK_DEV_RAM) is also included, this
507 also enables initial RAM disk (initrd) support and adds
508 15 Kbytes (more on some other architectures) to the kernel size.
509
510 If unsure say Y.
511
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800512if BLK_DEV_INITRD
513
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200514source "usr/Kconfig"
515
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800516endif
517
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800518config CC_OPTIMIZE_FOR_SIZE
Ingo Molnar96fffeb2008-04-28 01:39:43 +0200519 bool "Optimize for size"
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800520 default y
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800521 help
522 Enabling this option will pass "-Os" instead of "-O2" to gcc
523 resulting in a smaller kernel.
524
jkacur775a7222008-07-16 00:31:16 +0200525 If unsure, say Y.
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800526
Randy Dunlap08470622006-09-30 23:28:13 -0700527config SYSCTL
528 bool
529
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530menuconfig EMBEDDED
531 bool "Configure standard kernel features (for small systems)"
532 help
533 This option allows certain base kernel options and settings
534 to be disabled or tweaked. This is for specialized
535 environments which can tolerate a "non-standard" kernel.
536 Only use this if you really know what you are doing.
537
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700538config UID16
539 bool "Enable 16-bit UID system calls" if EMBEDDED
David S. Miller09337f52008-04-26 03:17:12 -0700540 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 -0700541 default y
542 help
543 This enables the legacy 16-bit UID syscall wrappers.
544
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700545config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700546 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800547 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700548 select SYSCTL
549 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800550 sys_sysctl uses binary paths that have been found challenging
551 to properly maintain and use. The interface in /proc/sys
552 using paths with ascii names is now the primary path to this
553 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700554
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800555 Almost nothing using the binary sysctl interface so if you are
556 trying to save some space it is probably safe to disable this,
557 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700558
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800559 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700560
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100562 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 default y
564 help
565 Say Y here to let the kernel print out symbolic crash information and
566 symbolic stack backtraces. This increases the size of the kernel
567 somewhat, as all symbols have to be loaded into the kernel image.
568
569config KALLSYMS_ALL
570 bool "Include all symbols in kallsyms"
571 depends on DEBUG_KERNEL && KALLSYMS
572 help
573 Normally kallsyms only contains the symbols of functions, for nicer
574 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200575 symbols too: say Y here to include all symbols, if you need them
576 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
578 Say N.
579
580config KALLSYMS_EXTRA_PASS
581 bool "Do an extra kallsyms pass"
582 depends on KALLSYMS
583 help
584 If kallsyms is not working correctly, the build will fail with
585 inconsistent kallsyms data. If that occurs, log a bug report and
586 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
587 Always say N here unless you find a bug in kallsyms, which must be
588 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
589 you wait for kallsyms to be fixed.
590
Matt Mackalld59745c2005-05-01 08:59:02 -0700591
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800592config HOTPLUG
593 bool "Support for hot-pluggable devices" if EMBEDDED
594 default y
595 help
596 This option is provided for the case where no hotplug or uevent
597 capabilities is wanted by the kernel. You should only consider
598 disabling this option for embedded systems that do not use modules, a
599 dynamic /dev tree, or dynamic device discovery. Just say Y.
600
Matt Mackalld59745c2005-05-01 08:59:02 -0700601config PRINTK
602 default y
603 bool "Enable support for printk" if EMBEDDED
604 help
605 This option enables normal printk support. Removing it
606 eliminates most of the message strings from the kernel image
607 and makes the kernel more or less silent. As this makes it
608 very difficult to diagnose system problems, saying N here is
609 strongly discouraged.
610
Matt Mackallc8538a72005-05-01 08:59:01 -0700611config BUG
612 bool "BUG() support" if EMBEDDED
613 default y
614 help
615 Disabling this option eliminates support for BUG and WARN, reducing
616 the size of your kernel image and potentially quietly ignoring
617 numerous fatal conditions. You should only consider disabling this
618 option for embedded systems with no facilities for reporting errors.
619 Just say Y.
620
Matt Mackall708e9a72006-01-08 01:05:25 -0800621config ELF_CORE
622 default y
623 bool "Enable ELF core dumps" if EMBEDDED
624 help
625 Enable support for generating core dumps. Disabling saves about 4k.
626
Stas Sergeeve5e1d3c2008-05-07 12:39:56 +0200627config PCSPKR_PLATFORM
628 bool "Enable PC-Speaker support" if EMBEDDED
629 depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES
630 default y
631 help
632 This option allows to disable the internal PC-Speaker
633 support, saving some memory.
634
Ingo Molnar32a93232008-02-06 22:39:44 +0100635config COMPAT_BRK
636 bool "Disable heap randomization"
637 default y
638 help
639 Randomizing heap placement makes heap exploits harder, but it
640 also breaks ancient binaries (including anything libc5 based).
641 This option changes the bootup default to heap randomization
642 disabled, and can be overriden runtime by setting
643 /proc/sys/kernel/randomize_va_space to 2.
644
Ingo Molnar166124f2008-02-09 23:24:09 +0100645 On non-ancient distros (post-2000 ones) N is usually a safe choice.
Ingo Molnar32a93232008-02-06 22:39:44 +0100646
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647config BASE_FULL
648 default y
649 bool "Enable full-sized data structures for core" if EMBEDDED
650 help
651 Disabling this option reduces the size of miscellaneous core
652 kernel data structures. This saves memory on small machines,
653 but may reduce performance.
654
655config FUTEX
656 bool "Enable futex support" if EMBEDDED
657 default y
Ingo Molnar23f78d42006-06-27 02:54:53 -0700658 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 help
660 Disabling this option will cause the kernel to be built without
661 support for "fast userspace mutexes". The resulting kernel may not
662 run glibc-based applications correctly.
663
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700664config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700665 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700666
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667config EPOLL
668 bool "Enable eventpoll support" if EMBEDDED
669 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700670 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 help
672 Disabling this option will cause the kernel to be built without
673 support for epoll family of system calls.
674
Davide Libenzifba2afa2007-05-10 22:23:13 -0700675config SIGNALFD
676 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700677 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700678 default y
679 help
680 Enable the signalfd() system call that allows to receive signals
681 on a file descriptor.
682
683 If unsure, say Y.
684
Davide Libenzib215e282007-05-10 22:23:16 -0700685config TIMERFD
686 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700687 select ANON_INODES
Davide Libenzib215e282007-05-10 22:23:16 -0700688 default y
689 help
690 Enable the timerfd() system call that allows to receive timer
691 events on a file descriptor.
692
693 If unsure, say Y.
694
Davide Libenzie1ad7462007-05-10 22:23:19 -0700695config EVENTFD
696 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700697 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700698 default y
699 help
700 Enable the eventfd() system call that allows to receive both
701 kernel notification (ie. KAIO) or userspace notifications.
702
703 If unsure, say Y.
704
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705config SHMEM
706 bool "Use full shmem filesystem" if EMBEDDED
707 default y
708 depends on MMU
709 help
710 The shmem is an internal filesystem used to manage shared memory.
711 It is backed by swap and manages resource limits. It is also exported
712 to userspace as tmpfs if TMPFS is enabled. Disabling this
713 option replaces shmem and tmpfs with the much simpler ramfs code,
714 which may be appropriate on small systems without swap.
715
Christoph Lameterf8891e52006-06-30 01:55:45 -0700716config VM_EVENT_COUNTERS
717 default y
718 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
719 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800720 VM event counters are needed for event counts to be shown.
721 This option allows the disabling of the VM event counters
722 on EMBEDDED systems. /proc/vmstat will only show page counts
723 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700724
Christoph Lameter41ecc552007-05-09 02:32:44 -0700725config SLUB_DEBUG
726 default y
727 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterf6acb632008-04-29 16:16:06 -0700728 depends on SLUB && SYSFS
Christoph Lameter41ecc552007-05-09 02:32:44 -0700729 help
730 SLUB has extensive debug support features. Disabling these can
731 result in significant savings in code size. This also disables
732 SLUB sysfs support. /sys/slab will not exist and there will be
733 no support for cache validation etc.
734
Christoph Lameter81819f02007-05-06 14:49:36 -0700735choice
736 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700737 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700738 help
739 This option allows to select a slab allocator.
740
741config SLAB
742 bool "SLAB"
743 help
744 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700745 well in all environments. It organizes cache hot objects in
Christoph Lameter81819f02007-05-06 14:49:36 -0700746 per cpu and per node queues. SLAB is the default choice for
Christoph Lameter34013882007-05-09 02:32:47 -0700747 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700748
749config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700750 bool "SLUB (Unqueued Allocator)"
751 help
752 SLUB is a slab allocator that minimizes cache line usage
753 instead of managing queues of cached objects (SLAB approach).
754 Per cpu caching is realized using slabs of objects instead
755 of queues of objects. SLUB can use memory efficiently
Christoph Lameter34013882007-05-09 02:32:47 -0700756 and has enhanced diagnostics.
Christoph Lameter81819f02007-05-06 14:49:36 -0700757
758config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700759 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700760 bool "SLOB (Simple Allocator)"
761 help
Matt Mackall37291452008-02-04 22:29:38 -0800762 SLOB replaces the stock allocator with a drastically simpler
763 allocator. SLOB is generally more space efficient but
764 does not perform as well on large systems.
Christoph Lameter81819f02007-05-06 14:49:36 -0700765
766endchoice
767
Mathieu Desnoyers125e5642008-02-02 15:10:36 -0500768config PROFILING
769 bool "Profiling support (EXPERIMENTAL)"
770 help
771 Say Y here to enable the extended profiling support mechanisms used
772 by profilers such as OProfile.
773
774config MARKERS
775 bool "Activate markers"
776 help
777 Place an empty function call at each marker site. Can be
778 dynamically changed for a probe function.
779
Mathieu Desnoyersfb32e032008-02-02 15:10:33 -0500780source "arch/Kconfig"
781
Matt Mackall1e883282008-02-04 22:29:07 -0800782config PROC_PAGE_MONITOR
783 default y
784 depends on PROC_FS && MMU
785 bool "Enable /proc page monitoring" if EMBEDDED
786 help
787 Various /proc files exist to monitor process memory utilization:
788 /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
789 /proc/kpagecount, and /proc/kpageflags. Disabling these
790 interfaces will reduce the size of the kernel by approximately 4kb.
791
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792endmenu # General setup
793
Dmitry Baryshkovee7e5512008-06-29 14:18:46 +0400794config HAVE_GENERIC_DMA_COHERENT
795 bool
796 default n
797
Linus Torvalds158a9622008-01-02 13:04:48 -0800798config SLABINFO
799 bool
800 depends on PROC_FS
Christoph Lameter0f389ec2008-04-14 18:53:02 +0300801 depends on SLAB || SLUB_DEBUG
Linus Torvalds158a9622008-01-02 13:04:48 -0800802 default y
803
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700804config RT_MUTEXES
805 boolean
806 select PLIST
807
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808config TINY_SHMEM
809 default !SHMEM
810 bool
811
812config BASE_SMALL
813 int
814 default 0 if BASE_FULL
815 default 1 if !BASE_FULL
816
Jan Engelhardt66da5732007-07-15 23:39:29 -0700817menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 bool "Enable loadable module support"
819 help
820 Kernel modules are small pieces of compiled code which can
821 be inserted in the running kernel, rather than being
822 permanently built into the kernel. You use the "modprobe"
823 tool to add (and sometimes remove) them. If you say Y here,
824 many parts of the kernel can be built as modules (by
825 answering M instead of Y where indicated): this is most
826 useful for infrequently used options which are not required
827 for booting. For more information, see the man pages for
828 modprobe, lsmod, modinfo, insmod and rmmod.
829
830 If you say Y here, you will need to run "make
831 modules_install" to put the modules under /lib/modules/
832 where modprobe can find them (you may need to be root to do
833 this).
834
835 If unsure, say Y.
836
Robert P. J. Day0b0de142008-08-04 13:31:32 -0400837if MODULES
838
Linus Torvalds826e4502008-05-04 17:04:16 -0700839config MODULE_FORCE_LOAD
840 bool "Forced module loading"
Linus Torvalds826e4502008-05-04 17:04:16 -0700841 default n
842 help
Rusty Russell91e37a72008-05-09 16:25:28 +1000843 Allow loading of modules without version information (ie. modprobe
844 --force). Forced module loading sets the 'F' (forced) taint flag and
845 is usually a really bad idea.
Linus Torvalds826e4502008-05-04 17:04:16 -0700846
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847config MODULE_UNLOAD
848 bool "Module unloading"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 help
850 Without this option you will not be able to unload any
851 modules (note that some modules may not be unloadable
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500852 anyway), which makes your kernel smaller, faster
853 and simpler. If unsure, say Y.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
855config MODULE_FORCE_UNLOAD
856 bool "Forced module unloading"
857 depends on MODULE_UNLOAD && EXPERIMENTAL
858 help
859 This option allows you to force a module to unload, even if the
860 kernel believes it is unsafe: the kernel will remove the module
861 without waiting for anyone to stop using it (using the -f option to
862 rmmod). This is mainly for kernel developers and desperate users.
863 If unsure, say N.
864
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100866 bool "Module versioning support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 help
868 Usually, you have to use modules compiled with your kernel.
869 Saying Y here makes it sometimes possible to use modules
870 compiled for different kernels, by adding enough information
871 to the modules to (hopefully) spot any changes which would
872 make them incompatible with the kernel you are running. If
873 unsure, say N.
874
875config MODULE_SRCVERSION_ALL
876 bool "Source checksum for all modules"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 help
878 Modules which contain a MODULE_VERSION get an extra "srcversion"
879 field inserted into their modinfo section, which contains a
880 sum of the source files which made it. This helps maintainers
881 see exactly which source was used to build a module (since
882 others sometimes change the module source without updating
883 the version). With this option, such a "srcversion" field
884 will be created for all modules. If unsure, say N.
885
886config KMOD
Johannes Bergbaabaae2008-07-08 19:00:16 +0200887 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 help
Johannes Bergbaabaae2008-07-08 19:00:16 +0200889 This is being removed soon. These days, CONFIG_MODULES
890 implies CONFIG_KMOD, so use that instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
Robert P. J. Day0b0de142008-08-04 13:31:32 -0400892endif # MODULES
893
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894config STOP_MACHINE
895 bool
896 default y
897 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
898 help
899 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100900
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100901source "block/Kconfig"
Avi Kivitye98c3202007-10-16 23:27:31 -0700902
903config PREEMPT_NOTIFIERS
904 bool
Paul E. McKenneye260be62008-01-25 21:08:24 +0100905
Paul E. McKenneye260be62008-01-25 21:08:24 +0100906config CLASSIC_RCU
Paul E. McKenney21bbb392008-03-10 11:43:57 -0700907 def_bool !PREEMPT_RCU
Paul E. McKenneye260be62008-01-25 21:08:24 +0100908 help
909 This option selects the classic RCU implementation that is
910 designed for best read-side performance on non-realtime
Paul E. McKenney21bbb392008-03-10 11:43:57 -0700911 systems. Classic RCU is the default. Note that the
912 PREEMPT_RCU symbol is used to select/deselect this option.