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Roman Zippelface4372006-06-08 22:12:45 -07001config DEFCONFIG_LIST
2 string
Paolo 'Blaisorblade' Giarrussob2670eac2006-10-19 23:28:23 -07003 depends on !UML
Roman Zippelface4372006-06-08 22:12:45 -07004 option defconfig_list
5 default "/lib/modules/$UNAME_RELEASE/.config"
6 default "/etc/kernel-config"
7 default "/boot/config-$UNAME_RELEASE"
8 default "arch/$ARCH/defconfig"
9
Al Boldiff0cfc62007-07-31 00:39:23 -070010menu "General setup"
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
12config EXPERIMENTAL
13 bool "Prompt for development and/or incomplete code/drivers"
14 ---help---
15 Some of the various things that Linux supports (such as network
16 drivers, file systems, network protocols, etc.) can be in a state
17 of development where the functionality, stability, or the level of
18 testing is not yet high enough for general use. This is usually
19 known as the "alpha-test" phase among developers. If a feature is
20 currently in alpha-test, then the developers usually discourage
21 uninformed widespread use of this feature by the general public to
22 avoid "Why doesn't this work?" type mail messages. However, active
23 testing and use of these systems is welcomed. Just be aware that it
24 may not meet the normal level of reliability or it may fail to work
25 in some special cases. Detailed bug reports from people familiar
26 with the kernel internals are usually welcomed by the developers
27 (before submitting bug reports, please read the documents
28 <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
29 <file:Documentation/BUG-HUNTING>, and
30 <file:Documentation/oops-tracing.txt> in the kernel source).
31
32 This option will also make obsoleted drivers available. These are
33 drivers that have been replaced by something else, and/or are
34 scheduled to be removed in a future kernel release.
35
36 Unless you intend to help test and develop a feature or driver that
37 falls into this category, or you have a situation that requires
38 using these features, you should probably say N here, which will
39 cause the configurator to present you with fewer choices. If
40 you say Y here, you will be offered the choice of using features or
41 drivers that are currently considered to be in the alpha-test phase.
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043config BROKEN
44 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46config BROKEN_ON_SMP
47 bool
48 depends on BROKEN || !SMP
49 default y
50
51config LOCK_KERNEL
52 bool
53 depends on SMP || PREEMPT
54 default y
55
56config INIT_ENV_ARG_LIMIT
57 int
Adrian Bunkdd673bc2006-06-30 01:55:51 -070058 default 32 if !UML
59 default 128 if UML
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 help
Randy Dunlap34ad92c2005-10-30 15:01:46 -080061 Maximum of each of the number of arguments and environment
62 variables passed to init from the kernel command line.
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65config LOCALVERSION
66 string "Local version - append to kernel release"
67 help
68 Append an extra string to the end of your kernel version.
69 This will show up when you type uname, for example.
70 The string you set here will be appended after the contents of
71 any files with a filename matching localversion* in your
72 object and source tree, in that order. Your total string can
73 be a maximum of 64 characters.
74
Ryan Andersonaaebf432005-07-31 04:57:49 -040075config LOCALVERSION_AUTO
76 bool "Automatically append version information to the version string"
77 default y
78 help
79 This will try to automatically determine if the current tree is a
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020080 release tree by looking for git tags that belong to the current
81 top of tree revision.
Ryan Andersonaaebf432005-07-31 04:57:49 -040082
83 A string of the format -gxxxxxxxx will be added to the localversion
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020084 if a git-based tree is found. The string generated by this will be
Ryan Andersonaaebf432005-07-31 04:57:49 -040085 appended after any matching localversion* files, and after the value
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020086 set in CONFIG_LOCALVERSION.
Ryan Andersonaaebf432005-07-31 04:57:49 -040087
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020088 (The actual string used here is the first eight characters produced
89 by running the command:
90
91 $ git rev-parse --verify HEAD
92
93 which is done within the script "scripts/setlocalversion".)
Ryan Andersonaaebf432005-07-31 04:57:49 -040094
Linus Torvalds1da177e2005-04-16 15:20:36 -070095config SWAP
96 bool "Support for paging of anonymous memory (swap)"
David Howells93614012006-09-30 20:45:40 +020097 depends on MMU && BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 default y
99 help
100 This option allows you to choose whether you want to have support
Jesper Juhl92c35042006-01-15 02:40:08 +0100101 for so called swap devices or swap files in your kernel that are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 used to provide more virtual memory than the actual RAM present
103 in your computer. If unsure say Y.
104
105config SYSVIPC
106 bool "System V IPC"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 ---help---
108 Inter Process Communication is a suite of library functions and
109 system calls which let processes (running programs) synchronize and
110 exchange information. It is generally considered to be a good thing,
111 and some programs won't run unless you say Y here. In particular, if
112 you want to run the DOS emulator dosemu under Linux (read the
113 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
114 you'll need to say Y here.
115
116 You can find documentation about IPC with "info ipc" and also in
117 section 6.4 of the Linux Programmer's Guide, available from
118 <http://www.tldp.org/guides.html>.
119
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800120config SYSVIPC_SYSCTL
121 bool
122 depends on SYSVIPC
123 depends on SYSCTL
124 default y
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126config POSIX_MQUEUE
127 bool "POSIX Message Queues"
128 depends on NET && EXPERIMENTAL
129 ---help---
130 POSIX variant of message queues is a part of IPC. In POSIX message
131 queues every message has a priority which decides about succession
132 of receiving it by a process. If you want to compile and run
133 programs written e.g. for Solaris with use of its POSIX message
Robert P. J. Dayb0e37652007-05-09 07:25:13 +0200134 queues (functions mq_*) say Y here.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
136 POSIX message queues are visible as a filesystem called 'mqueue'
137 and can be mounted somewhere if you want to do filesystem
138 operations on message queues.
139
140 If unsure, say Y.
141
142config BSD_PROCESS_ACCT
143 bool "BSD Process Accounting"
144 help
145 If you say Y here, a user level program will be able to instruct the
146 kernel (via a special system call) to write process accounting
147 information to a file: whenever a process exits, information about
148 that process will be appended to the file by the kernel. The
149 information includes things such as creation time, owning user,
150 command name, memory usage, controlling terminal etc. (the complete
151 list is in the struct acct in <file:include/linux/acct.h>). It is
152 up to the user level program to do useful things with this
153 information. This is generally a good idea, so say Y.
154
155config BSD_PROCESS_ACCT_V3
156 bool "BSD Process Accounting version 3 file format"
157 depends on BSD_PROCESS_ACCT
158 default n
159 help
160 If you say Y here, the process accounting information is written
161 in a new file format that also logs the process IDs of each
162 process and it's parent. Note that this file format is incompatible
163 with previous v0/v1/v2 file formats, so you will need updated tools
164 for processing it. A preliminary version of these tools is available
165 at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
166
Shailabh Nagarc7572492006-07-14 00:24:40 -0700167config TASKSTATS
168 bool "Export task/process statistics through netlink (EXPERIMENTAL)"
169 depends on NET
170 default n
171 help
172 Export selected statistics for tasks/processes through the
173 generic netlink interface. Unlike BSD process accounting, the
174 statistics are available during the lifetime of tasks/processes as
175 responses to commands. Like BSD accounting, they are sent to user
176 space on task exit.
177
178 Say N if unsure.
179
Shailabh Nagarca74e922006-07-14 00:24:36 -0700180config TASK_DELAY_ACCT
181 bool "Enable per-task delay accounting (EXPERIMENTAL)"
Shailabh Nagar6f449932006-07-14 00:24:41 -0700182 depends on TASKSTATS
Shailabh Nagarca74e922006-07-14 00:24:36 -0700183 help
184 Collect information on time spent by a task waiting for system
185 resources like cpu, synchronous block I/O completion and swapping
186 in pages. Such statistics can help in setting a task's priorities
187 relative to other tasks for cpu, io, rss limits etc.
188
189 Say N if unsure.
190
Alexey Dobriyan18f705f2007-02-10 01:46:44 -0800191config TASK_XACCT
192 bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
193 depends on TASKSTATS
194 help
195 Collect extended task accounting data and send the data
196 to userland for processing over the taskstats interface.
197
198 Say N if unsure.
199
200config TASK_IO_ACCOUNTING
201 bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
202 depends on TASK_XACCT
203 help
204 Collect information on the number of bytes of storage I/O which this
205 task has caused.
206
207 Say N if unsure.
208
Cedric Le Goateracce2922007-07-15 23:40:59 -0700209config USER_NS
210 bool "User Namespaces (EXPERIMENTAL)"
211 default n
212 depends on EXPERIMENTAL
213 help
214 Support user namespaces. This allows containers, i.e.
215 vservers, to use user namespaces to provide different
216 user info for different servers. If unsure, say N.
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"
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800229 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64)
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237config IKCONFIG
Ross Birof2443ab2006-09-30 23:27:25 -0700238 tristate "Kernel .config support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 ---help---
240 This option enables the complete Linux kernel ".config" file
241 contents to be saved in the kernel. It provides documentation
242 of which kernel options are used in a running kernel or in an
243 on-disk kernel. This information can be extracted from the kernel
244 image file with the script scripts/extract-ikconfig and used as
245 input to rebuild the current kernel or to build another kernel.
246 It can also be extracted from a running kernel by reading
247 /proc/config.gz if enabled (below).
248
249config IKCONFIG_PROC
250 bool "Enable access to .config through /proc/config.gz"
251 depends on IKCONFIG && PROC_FS
252 ---help---
253 This option enables access to the kernel configuration file
254 through /proc/config.gz.
255
Alistair John Strachan794543a2007-05-08 00:31:15 -0700256config LOG_BUF_SHIFT
257 int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
258 range 12 21
259 default 17 if S390 || LOCKDEP
260 default 16 if X86_NUMAQ || IA64
261 default 15 if SMP
262 default 14
263 help
264 Select kernel log buffer size as a power of 2.
265 Defaults and Examples:
266 17 => 128 KB for S/390
267 16 => 64 KB for x86 NUMAQ or IA-64
268 15 => 32 KB for SMP
269 14 => 16 KB for uniprocessor
270 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
284 help
285 This option enables a simple cgroup subsystem that
286 exports useful debugging information about the cgroups
287 framework
288
289 Say N if unsure
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291config CPUSETS
292 bool "Cpuset support"
Paul Menage8793d852007-10-18 23:39:39 -0700293 depends on SMP && CGROUPS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700295 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 allow dynamically partitioning a system into sets of CPUs and
297 Memory Nodes and assigning tasks to run only within those sets.
298 This is primarily useful on large SMP or NUMA systems.
299
300 Say N if unsure.
301
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200302config FAIR_GROUP_SCHED
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200303 bool "Fair group CPU scheduler"
Ingo Molnarde8d5852007-10-15 17:00:09 +0200304 default y
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +0200305 depends on EXPERIMENTAL
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200306 help
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200307 This feature lets CPU scheduler recognize task groups and control CPU
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +0200308 bandwidth allocation to such task groups.
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200309
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200310choice
311 depends on FAIR_GROUP_SCHED
312 prompt "Basis for grouping tasks"
313 default FAIR_USER_SCHED
314
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200315config FAIR_USER_SCHED
316 bool "user id"
317 help
318 This option will choose userid as the basis for grouping
319 tasks, thus providing equal CPU bandwidth to each user.
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200320
321endchoice
322
Kay Sievers88a22c92006-09-14 11:23:28 +0200323config SYSFS_DEPRECATED
324 bool "Create deprecated sysfs files"
325 default y
326 help
327 This option creates deprecated symlinks such as the
328 "device"-link, the <subsystem>:<name>-link, and the
329 "bus"-link. It may also add deprecated key in the
330 uevent environment.
331 None of these features or values should be used today, as
332 they export driver core implementation details to userspace
333 or export properties which can't be kept stable across kernel
334 releases.
335
336 If enabled, this option will also move any device structures
David Sterba3dde6ad2007-05-09 07:12:20 +0200337 that belong to a class, back into the /sys/class hierarchy, in
Kay Sievers88a22c92006-09-14 11:23:28 +0200338 order to support older versions of udev.
339
340 If you are using a distro that was released in 2006 or later,
341 it should be safe to say N here.
342
Paul Menage8793d852007-10-18 23:39:39 -0700343config PROC_PID_CPUSET
344 bool "Include legacy /proc/<pid>/cpuset file"
345 depends on CPUSETS
346 default y
347
Paul Menage62d0df62007-10-18 23:39:42 -0700348config CGROUP_CPUACCT
349 bool "Simple CPU accounting cgroup subsystem"
350 depends on CGROUPS
351 help
352 Provides a simple Resource Controller for monitoring the
353 total CPU consumed by the tasks in a cgroup
354
Jens Axboeb86ff9812006-03-23 19:56:55 +0100355config RELAY
356 bool "Kernel->user space relay support (formerly relayfs)"
357 help
358 This option enables support for relay interface support in
359 certain file systems (such as debugfs).
360 It is designed to provide an efficient mechanism for tools and
361 facilities to relay large amounts of data from kernel space to
362 user space.
363
364 If unsure, say N.
365
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800366config BLK_DEV_INITRD
367 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
368 depends on BROKEN || !FRV
369 help
370 The initial RAM filesystem is a ramfs which is loaded by the
371 boot loader (loadlin or lilo) and that is mounted as root
372 before the normal boot procedure. It is typically used to
373 load modules needed to mount the "real" root file system,
374 etc. See <file:Documentation/initrd.txt> for details.
375
376 If RAM disk support (BLK_DEV_RAM) is also included, this
377 also enables initial RAM disk (initrd) support and adds
378 15 Kbytes (more on some other architectures) to the kernel size.
379
380 If unsure say Y.
381
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800382if BLK_DEV_INITRD
383
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200384source "usr/Kconfig"
385
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800386endif
387
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800388config CC_OPTIMIZE_FOR_SIZE
389 bool "Optimize for size (Look out for broken compilers!)"
390 default y
Paul Mundt32582fa2007-07-25 11:27:05 +0900391 depends on ARM || H8300 || SUPERH || EXPERIMENTAL
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800392 help
393 Enabling this option will pass "-Os" instead of "-O2" to gcc
394 resulting in a smaller kernel.
395
396 WARNING: some versions of gcc may generate incorrect code with this
397 option. If problems are observed, a gcc upgrade may be needed.
398
399 If unsure, say N.
400
Randy Dunlap08470622006-09-30 23:28:13 -0700401config SYSCTL
402 bool
403
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404menuconfig EMBEDDED
405 bool "Configure standard kernel features (for small systems)"
406 help
407 This option allows certain base kernel options and settings
408 to be disabled or tweaked. This is for specialized
409 environments which can tolerate a "non-standard" kernel.
410 Only use this if you really know what you are doing.
411
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700412config UID16
413 bool "Enable 16-bit UID system calls" if EMBEDDED
Bryan Wu1394f032007-05-06 14:50:22 -0700414 depends on ARM || BFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION)
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700415 default y
416 help
417 This enables the legacy 16-bit UID syscall wrappers.
418
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700419config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700420 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800421 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700422 select SYSCTL
423 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800424 sys_sysctl uses binary paths that have been found challenging
425 to properly maintain and use. The interface in /proc/sys
426 using paths with ascii names is now the primary path to this
427 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700428
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800429 Almost nothing using the binary sysctl interface so if you are
430 trying to save some space it is probably safe to disable this,
431 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700432
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800433 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700434
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100436 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 default y
438 help
439 Say Y here to let the kernel print out symbolic crash information and
440 symbolic stack backtraces. This increases the size of the kernel
441 somewhat, as all symbols have to be loaded into the kernel image.
442
443config KALLSYMS_ALL
444 bool "Include all symbols in kallsyms"
445 depends on DEBUG_KERNEL && KALLSYMS
446 help
447 Normally kallsyms only contains the symbols of functions, for nicer
448 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200449 symbols too: say Y here to include all symbols, if you need them
450 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451
452 Say N.
453
454config KALLSYMS_EXTRA_PASS
455 bool "Do an extra kallsyms pass"
456 depends on KALLSYMS
457 help
458 If kallsyms is not working correctly, the build will fail with
459 inconsistent kallsyms data. If that occurs, log a bug report and
460 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
461 Always say N here unless you find a bug in kallsyms, which must be
462 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
463 you wait for kallsyms to be fixed.
464
Matt Mackalld59745c2005-05-01 08:59:02 -0700465
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800466config HOTPLUG
467 bool "Support for hot-pluggable devices" if EMBEDDED
468 default y
469 help
470 This option is provided for the case where no hotplug or uevent
471 capabilities is wanted by the kernel. You should only consider
472 disabling this option for embedded systems that do not use modules, a
473 dynamic /dev tree, or dynamic device discovery. Just say Y.
474
Matt Mackalld59745c2005-05-01 08:59:02 -0700475config PRINTK
476 default y
477 bool "Enable support for printk" if EMBEDDED
478 help
479 This option enables normal printk support. Removing it
480 eliminates most of the message strings from the kernel image
481 and makes the kernel more or less silent. As this makes it
482 very difficult to diagnose system problems, saying N here is
483 strongly discouraged.
484
Matt Mackallc8538a72005-05-01 08:59:01 -0700485config BUG
486 bool "BUG() support" if EMBEDDED
487 default y
488 help
489 Disabling this option eliminates support for BUG and WARN, reducing
490 the size of your kernel image and potentially quietly ignoring
491 numerous fatal conditions. You should only consider disabling this
492 option for embedded systems with no facilities for reporting errors.
493 Just say Y.
494
Matt Mackall708e9a72006-01-08 01:05:25 -0800495config ELF_CORE
496 default y
497 bool "Enable ELF core dumps" if EMBEDDED
498 help
499 Enable support for generating core dumps. Disabling saves about 4k.
500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501config BASE_FULL
502 default y
503 bool "Enable full-sized data structures for core" if EMBEDDED
504 help
505 Disabling this option reduces the size of miscellaneous core
506 kernel data structures. This saves memory on small machines,
507 but may reduce performance.
508
509config FUTEX
510 bool "Enable futex support" if EMBEDDED
511 default y
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700512 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 help
514 Disabling this option will cause the kernel to be built without
515 support for "fast userspace mutexes". The resulting kernel may not
516 run glibc-based applications correctly.
517
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700518config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700519 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700520
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521config EPOLL
522 bool "Enable eventpoll support" if EMBEDDED
523 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700524 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 help
526 Disabling this option will cause the kernel to be built without
527 support for epoll family of system calls.
528
Davide Libenzifba2afa2007-05-10 22:23:13 -0700529config SIGNALFD
530 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700531 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700532 default y
533 help
534 Enable the signalfd() system call that allows to receive signals
535 on a file descriptor.
536
537 If unsure, say Y.
538
Davide Libenzib215e282007-05-10 22:23:16 -0700539config TIMERFD
540 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700541 select ANON_INODES
Andrew Mortone4260192007-09-18 22:46:41 -0700542 depends on BROKEN
Davide Libenzib215e282007-05-10 22:23:16 -0700543 default y
544 help
545 Enable the timerfd() system call that allows to receive timer
546 events on a file descriptor.
547
548 If unsure, say Y.
549
Davide Libenzie1ad7462007-05-10 22:23:19 -0700550config EVENTFD
551 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700552 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700553 default y
554 help
555 Enable the eventfd() system call that allows to receive both
556 kernel notification (ie. KAIO) or userspace notifications.
557
558 If unsure, say Y.
559
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560config SHMEM
561 bool "Use full shmem filesystem" if EMBEDDED
562 default y
563 depends on MMU
564 help
565 The shmem is an internal filesystem used to manage shared memory.
566 It is backed by swap and manages resource limits. It is also exported
567 to userspace as tmpfs if TMPFS is enabled. Disabling this
568 option replaces shmem and tmpfs with the much simpler ramfs code,
569 which may be appropriate on small systems without swap.
570
Christoph Lameterf8891e52006-06-30 01:55:45 -0700571config VM_EVENT_COUNTERS
572 default y
573 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
574 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800575 VM event counters are needed for event counts to be shown.
576 This option allows the disabling of the VM event counters
577 on EMBEDDED systems. /proc/vmstat will only show page counts
578 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700579
Christoph Lameter41ecc552007-05-09 02:32:44 -0700580config SLUB_DEBUG
581 default y
582 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterd4751a22007-05-10 03:15:40 -0700583 depends on SLUB
Christoph Lameter41ecc552007-05-09 02:32:44 -0700584 help
585 SLUB has extensive debug support features. Disabling these can
586 result in significant savings in code size. This also disables
587 SLUB sysfs support. /sys/slab will not exist and there will be
588 no support for cache validation etc.
589
Christoph Lameter81819f02007-05-06 14:49:36 -0700590choice
591 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700592 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700593 help
594 This option allows to select a slab allocator.
595
596config SLAB
597 bool "SLAB"
598 help
599 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700600 well in all environments. It organizes cache hot objects in
Christoph Lameter81819f02007-05-06 14:49:36 -0700601 per cpu and per node queues. SLAB is the default choice for
Christoph Lameter34013882007-05-09 02:32:47 -0700602 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700603
604config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700605 bool "SLUB (Unqueued Allocator)"
606 help
607 SLUB is a slab allocator that minimizes cache line usage
608 instead of managing queues of cached objects (SLAB approach).
609 Per cpu caching is realized using slabs of objects instead
610 of queues of objects. SLUB can use memory efficiently
Christoph Lameter34013882007-05-09 02:32:47 -0700611 and has enhanced diagnostics.
Christoph Lameter81819f02007-05-06 14:49:36 -0700612
613config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700614 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700615 bool "SLOB (Simple Allocator)"
616 help
617 SLOB replaces the SLAB allocator with a drastically simpler
Nick Pigginafc0ced2007-05-16 22:10:49 -0700618 allocator. SLOB is more space efficient than SLAB but does not
Christoph Lameter34013882007-05-09 02:32:47 -0700619 scale well (single lock for all operations) and is also highly
620 susceptible to fragmentation. SLUB can accomplish a higher object
621 density. It is usually better to use SLUB instead of SLOB.
Christoph Lameter81819f02007-05-06 14:49:36 -0700622
623endchoice
624
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625endmenu # General setup
626
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700627config RT_MUTEXES
628 boolean
629 select PLIST
630
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631config TINY_SHMEM
632 default !SHMEM
633 bool
634
635config BASE_SMALL
636 int
637 default 0 if BASE_FULL
638 default 1 if !BASE_FULL
639
Jan Engelhardt66da5732007-07-15 23:39:29 -0700640menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 bool "Enable loadable module support"
642 help
643 Kernel modules are small pieces of compiled code which can
644 be inserted in the running kernel, rather than being
645 permanently built into the kernel. You use the "modprobe"
646 tool to add (and sometimes remove) them. If you say Y here,
647 many parts of the kernel can be built as modules (by
648 answering M instead of Y where indicated): this is most
649 useful for infrequently used options which are not required
650 for booting. For more information, see the man pages for
651 modprobe, lsmod, modinfo, insmod and rmmod.
652
653 If you say Y here, you will need to run "make
654 modules_install" to put the modules under /lib/modules/
655 where modprobe can find them (you may need to be root to do
656 this).
657
658 If unsure, say Y.
659
660config MODULE_UNLOAD
661 bool "Module unloading"
662 depends on MODULES
663 help
664 Without this option you will not be able to unload any
665 modules (note that some modules may not be unloadable
666 anyway), which makes your kernel slightly smaller and
667 simpler. If unsure, say Y.
668
669config MODULE_FORCE_UNLOAD
670 bool "Forced module unloading"
671 depends on MODULE_UNLOAD && EXPERIMENTAL
672 help
673 This option allows you to force a module to unload, even if the
674 kernel believes it is unsafe: the kernel will remove the module
675 without waiting for anyone to stop using it (using the -f option to
676 rmmod). This is mainly for kernel developers and desperate users.
677 If unsure, say N.
678
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100680 bool "Module versioning support"
681 depends on MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 help
683 Usually, you have to use modules compiled with your kernel.
684 Saying Y here makes it sometimes possible to use modules
685 compiled for different kernels, by adding enough information
686 to the modules to (hopefully) spot any changes which would
687 make them incompatible with the kernel you are running. If
688 unsure, say N.
689
690config MODULE_SRCVERSION_ALL
691 bool "Source checksum for all modules"
692 depends on MODULES
693 help
694 Modules which contain a MODULE_VERSION get an extra "srcversion"
695 field inserted into their modinfo section, which contains a
696 sum of the source files which made it. This helps maintainers
697 see exactly which source was used to build a module (since
698 others sometimes change the module source without updating
699 the version). With this option, such a "srcversion" field
700 will be created for all modules. If unsure, say N.
701
702config KMOD
703 bool "Automatic kernel module loading"
704 depends on MODULES
705 help
706 Normally when you have selected some parts of the kernel to
707 be created as kernel modules, you must load them (using the
708 "modprobe" command) before you can use them. If you say Y
709 here, some parts of the kernel will be able to load modules
710 automatically: when a part of the kernel needs a module, it
711 runs modprobe with the appropriate arguments, thereby
712 loading the module if it is available. If unsure, say Y.
713
714config STOP_MACHINE
715 bool
716 default y
717 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
718 help
719 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100720
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100721source "block/Kconfig"
Avi Kivitye98c3202007-10-16 23:27:31 -0700722
723config PREEMPT_NOTIFIERS
724 bool