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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"
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42 drivers that have been replaced by something else, and/or are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
174 at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
175
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
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 Axboeb86ff9812006-03-23 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
489 Suport process id namespaces. This allows having multiple
490 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
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800525 If unsure, say N.
526
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
Holger Schurig88f458e2008-04-29 01:02:36 -0700561config SYSCTL_SYSCALL_CHECK
562 bool "Sysctl checks" if EMBEDDED
563 depends on SYSCTL_SYSCALL
564 default y
565 ---help---
566 sys_sysctl uses binary paths that have been found challenging
567 to properly maintain and use. This enables checks that help
568 you to keep things correct.
569
570 If unsure say Y here.
571
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100573 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 default y
575 help
576 Say Y here to let the kernel print out symbolic crash information and
577 symbolic stack backtraces. This increases the size of the kernel
578 somewhat, as all symbols have to be loaded into the kernel image.
579
580config KALLSYMS_ALL
581 bool "Include all symbols in kallsyms"
582 depends on DEBUG_KERNEL && KALLSYMS
583 help
584 Normally kallsyms only contains the symbols of functions, for nicer
585 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200586 symbols too: say Y here to include all symbols, if you need them
587 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
589 Say N.
590
591config KALLSYMS_EXTRA_PASS
592 bool "Do an extra kallsyms pass"
593 depends on KALLSYMS
594 help
595 If kallsyms is not working correctly, the build will fail with
596 inconsistent kallsyms data. If that occurs, log a bug report and
597 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
598 Always say N here unless you find a bug in kallsyms, which must be
599 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
600 you wait for kallsyms to be fixed.
601
Matt Mackalld59745c2005-05-01 08:59:02 -0700602
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800603config HOTPLUG
604 bool "Support for hot-pluggable devices" if EMBEDDED
605 default y
606 help
607 This option is provided for the case where no hotplug or uevent
608 capabilities is wanted by the kernel. You should only consider
609 disabling this option for embedded systems that do not use modules, a
610 dynamic /dev tree, or dynamic device discovery. Just say Y.
611
Matt Mackalld59745c2005-05-01 08:59:02 -0700612config PRINTK
613 default y
614 bool "Enable support for printk" if EMBEDDED
615 help
616 This option enables normal printk support. Removing it
617 eliminates most of the message strings from the kernel image
618 and makes the kernel more or less silent. As this makes it
619 very difficult to diagnose system problems, saying N here is
620 strongly discouraged.
621
Matt Mackallc8538a72005-05-01 08:59:01 -0700622config BUG
623 bool "BUG() support" if EMBEDDED
624 default y
625 help
626 Disabling this option eliminates support for BUG and WARN, reducing
627 the size of your kernel image and potentially quietly ignoring
628 numerous fatal conditions. You should only consider disabling this
629 option for embedded systems with no facilities for reporting errors.
630 Just say Y.
631
Matt Mackall708e9a72006-01-08 01:05:25 -0800632config ELF_CORE
633 default y
634 bool "Enable ELF core dumps" if EMBEDDED
635 help
636 Enable support for generating core dumps. Disabling saves about 4k.
637
Stas Sergeeve5e1d3c2008-05-07 12:39:56 +0200638config PCSPKR_PLATFORM
639 bool "Enable PC-Speaker support" if EMBEDDED
640 depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES
641 default y
642 help
643 This option allows to disable the internal PC-Speaker
644 support, saving some memory.
645
Ingo Molnar32a93232008-02-06 22:39:44 +0100646config COMPAT_BRK
647 bool "Disable heap randomization"
648 default y
649 help
650 Randomizing heap placement makes heap exploits harder, but it
651 also breaks ancient binaries (including anything libc5 based).
652 This option changes the bootup default to heap randomization
653 disabled, and can be overriden runtime by setting
654 /proc/sys/kernel/randomize_va_space to 2.
655
Ingo Molnar166124f2008-02-09 23:24:09 +0100656 On non-ancient distros (post-2000 ones) N is usually a safe choice.
Ingo Molnar32a93232008-02-06 22:39:44 +0100657
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658config BASE_FULL
659 default y
660 bool "Enable full-sized data structures for core" if EMBEDDED
661 help
662 Disabling this option reduces the size of miscellaneous core
663 kernel data structures. This saves memory on small machines,
664 but may reduce performance.
665
666config FUTEX
667 bool "Enable futex support" if EMBEDDED
668 default y
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700669 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 help
671 Disabling this option will cause the kernel to be built without
672 support for "fast userspace mutexes". The resulting kernel may not
673 run glibc-based applications correctly.
674
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700675config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700676 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700677
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678config EPOLL
679 bool "Enable eventpoll support" if EMBEDDED
680 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700681 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 help
683 Disabling this option will cause the kernel to be built without
684 support for epoll family of system calls.
685
Davide Libenzifba2afa2007-05-10 22:23:13 -0700686config SIGNALFD
687 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700688 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700689 default y
690 help
691 Enable the signalfd() system call that allows to receive signals
692 on a file descriptor.
693
694 If unsure, say Y.
695
Davide Libenzib215e282007-05-10 22:23:16 -0700696config TIMERFD
697 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700698 select ANON_INODES
Davide Libenzib215e282007-05-10 22:23:16 -0700699 default y
700 help
701 Enable the timerfd() system call that allows to receive timer
702 events on a file descriptor.
703
704 If unsure, say Y.
705
Davide Libenzie1ad7462007-05-10 22:23:19 -0700706config EVENTFD
707 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700708 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700709 default y
710 help
711 Enable the eventfd() system call that allows to receive both
712 kernel notification (ie. KAIO) or userspace notifications.
713
714 If unsure, say Y.
715
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716config SHMEM
717 bool "Use full shmem filesystem" if EMBEDDED
718 default y
719 depends on MMU
720 help
721 The shmem is an internal filesystem used to manage shared memory.
722 It is backed by swap and manages resource limits. It is also exported
723 to userspace as tmpfs if TMPFS is enabled. Disabling this
724 option replaces shmem and tmpfs with the much simpler ramfs code,
725 which may be appropriate on small systems without swap.
726
Christoph Lameterf8891e52006-06-30 01:55:45 -0700727config VM_EVENT_COUNTERS
728 default y
729 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
730 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800731 VM event counters are needed for event counts to be shown.
732 This option allows the disabling of the VM event counters
733 on EMBEDDED systems. /proc/vmstat will only show page counts
734 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700735
Christoph Lameter41ecc552007-05-09 02:32:44 -0700736config SLUB_DEBUG
737 default y
738 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterf6acb632008-04-29 16:16:06 -0700739 depends on SLUB && SYSFS
Christoph Lameter41ecc552007-05-09 02:32:44 -0700740 help
741 SLUB has extensive debug support features. Disabling these can
742 result in significant savings in code size. This also disables
743 SLUB sysfs support. /sys/slab will not exist and there will be
744 no support for cache validation etc.
745
Christoph Lameter81819f02007-05-06 14:49:36 -0700746choice
747 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700748 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700749 help
750 This option allows to select a slab allocator.
751
752config SLAB
753 bool "SLAB"
754 help
755 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700756 well in all environments. It organizes cache hot objects in
Christoph Lameter81819f02007-05-06 14:49:36 -0700757 per cpu and per node queues. SLAB is the default choice for
Christoph Lameter34013882007-05-09 02:32:47 -0700758 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700759
760config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700761 bool "SLUB (Unqueued Allocator)"
762 help
763 SLUB is a slab allocator that minimizes cache line usage
764 instead of managing queues of cached objects (SLAB approach).
765 Per cpu caching is realized using slabs of objects instead
766 of queues of objects. SLUB can use memory efficiently
Christoph Lameter34013882007-05-09 02:32:47 -0700767 and has enhanced diagnostics.
Christoph Lameter81819f02007-05-06 14:49:36 -0700768
769config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700770 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700771 bool "SLOB (Simple Allocator)"
772 help
Matt Mackall37291452008-02-04 22:29:38 -0800773 SLOB replaces the stock allocator with a drastically simpler
774 allocator. SLOB is generally more space efficient but
775 does not perform as well on large systems.
Christoph Lameter81819f02007-05-06 14:49:36 -0700776
777endchoice
778
Mathieu Desnoyers125e5642008-02-02 15:10:36 -0500779config PROFILING
780 bool "Profiling support (EXPERIMENTAL)"
781 help
782 Say Y here to enable the extended profiling support mechanisms used
783 by profilers such as OProfile.
784
785config MARKERS
786 bool "Activate markers"
787 help
788 Place an empty function call at each marker site. Can be
789 dynamically changed for a probe function.
790
Mathieu Desnoyersfb32e032008-02-02 15:10:33 -0500791source "arch/Kconfig"
792
Matt Mackall1e883282008-02-04 22:29:07 -0800793config PROC_PAGE_MONITOR
794 default y
795 depends on PROC_FS && MMU
796 bool "Enable /proc page monitoring" if EMBEDDED
797 help
798 Various /proc files exist to monitor process memory utilization:
799 /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
800 /proc/kpagecount, and /proc/kpageflags. Disabling these
801 interfaces will reduce the size of the kernel by approximately 4kb.
802
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803endmenu # General setup
804
Linus Torvalds158a9622008-01-02 13:04:48 -0800805config SLABINFO
806 bool
807 depends on PROC_FS
Christoph Lameter0f389ec2008-04-14 18:53:02 +0300808 depends on SLAB || SLUB_DEBUG
Linus Torvalds158a9622008-01-02 13:04:48 -0800809 default y
810
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700811config RT_MUTEXES
812 boolean
813 select PLIST
814
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815config TINY_SHMEM
816 default !SHMEM
817 bool
818
819config BASE_SMALL
820 int
821 default 0 if BASE_FULL
822 default 1 if !BASE_FULL
823
Jan Engelhardt66da5732007-07-15 23:39:29 -0700824menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 bool "Enable loadable module support"
826 help
827 Kernel modules are small pieces of compiled code which can
828 be inserted in the running kernel, rather than being
829 permanently built into the kernel. You use the "modprobe"
830 tool to add (and sometimes remove) them. If you say Y here,
831 many parts of the kernel can be built as modules (by
832 answering M instead of Y where indicated): this is most
833 useful for infrequently used options which are not required
834 for booting. For more information, see the man pages for
835 modprobe, lsmod, modinfo, insmod and rmmod.
836
837 If you say Y here, you will need to run "make
838 modules_install" to put the modules under /lib/modules/
839 where modprobe can find them (you may need to be root to do
840 this).
841
842 If unsure, say Y.
843
Linus Torvalds826e4502008-05-04 17:04:16 -0700844config MODULE_FORCE_LOAD
845 bool "Forced module loading"
846 depends on MODULES
847 default n
848 help
Rusty Russell91e37a72008-05-09 16:25:28 +1000849 Allow loading of modules without version information (ie. modprobe
850 --force). Forced module loading sets the 'F' (forced) taint flag and
851 is usually a really bad idea.
Linus Torvalds826e4502008-05-04 17:04:16 -0700852
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853config MODULE_UNLOAD
854 bool "Module unloading"
855 depends on MODULES
856 help
857 Without this option you will not be able to unload any
858 modules (note that some modules may not be unloadable
859 anyway), which makes your kernel slightly smaller and
860 simpler. If unsure, say Y.
861
862config MODULE_FORCE_UNLOAD
863 bool "Forced module unloading"
864 depends on MODULE_UNLOAD && EXPERIMENTAL
865 help
866 This option allows you to force a module to unload, even if the
867 kernel believes it is unsafe: the kernel will remove the module
868 without waiting for anyone to stop using it (using the -f option to
869 rmmod). This is mainly for kernel developers and desperate users.
870 If unsure, say N.
871
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100873 bool "Module versioning support"
874 depends on MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 help
876 Usually, you have to use modules compiled with your kernel.
877 Saying Y here makes it sometimes possible to use modules
878 compiled for different kernels, by adding enough information
879 to the modules to (hopefully) spot any changes which would
880 make them incompatible with the kernel you are running. If
881 unsure, say N.
882
883config MODULE_SRCVERSION_ALL
884 bool "Source checksum for all modules"
885 depends on MODULES
886 help
887 Modules which contain a MODULE_VERSION get an extra "srcversion"
888 field inserted into their modinfo section, which contains a
889 sum of the source files which made it. This helps maintainers
890 see exactly which source was used to build a module (since
891 others sometimes change the module source without updating
892 the version). With this option, such a "srcversion" field
893 will be created for all modules. If unsure, say N.
894
895config KMOD
896 bool "Automatic kernel module loading"
897 depends on MODULES
898 help
899 Normally when you have selected some parts of the kernel to
900 be created as kernel modules, you must load them (using the
901 "modprobe" command) before you can use them. If you say Y
902 here, some parts of the kernel will be able to load modules
903 automatically: when a part of the kernel needs a module, it
904 runs modprobe with the appropriate arguments, thereby
905 loading the module if it is available. If unsure, say Y.
906
907config STOP_MACHINE
908 bool
909 default y
910 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
911 help
912 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100913
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100914source "block/Kconfig"
Avi Kivitye98c3202007-10-16 23:27:31 -0700915
916config PREEMPT_NOTIFIERS
917 bool
Paul E. McKenneye260be62008-01-25 21:08:24 +0100918
Paul E. McKenneye260be62008-01-25 21:08:24 +0100919config CLASSIC_RCU
Paul E. McKenney21bbb392008-03-10 11:43:57 -0700920 def_bool !PREEMPT_RCU
Paul E. McKenneye260be62008-01-25 21:08:24 +0100921 help
922 This option selects the classic RCU implementation that is
923 designed for best read-side performance on non-realtime
Paul E. McKenney21bbb392008-03-10 11:43:57 -0700924 systems. Classic RCU is the default. Note that the
925 PREEMPT_RCU symbol is used to select/deselect this option.