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Roman Zippel80daa562008-01-14 04:51:16 +01001config ARCH
2 string
3 option env="ARCH"
4
5config KERNELVERSION
6 string
7 option env="KERNELVERSION"
8
Roman Zippelface4372006-06-08 22:12:45 -07009config DEFCONFIG_LIST
10 string
Paolo 'Blaisorblade' Giarrussob2670eac2006-10-19 23:28:23 -070011 depends on !UML
Roman Zippelface4372006-06-08 22:12:45 -070012 option defconfig_list
13 default "/lib/modules/$UNAME_RELEASE/.config"
14 default "/etc/kernel-config"
15 default "/boot/config-$UNAME_RELEASE"
16 default "arch/$ARCH/defconfig"
17
Al Boldiff0cfc62007-07-31 00:39:23 -070018menu "General setup"
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20config EXPERIMENTAL
21 bool "Prompt for development and/or incomplete code/drivers"
22 ---help---
23 Some of the various things that Linux supports (such as network
24 drivers, file systems, network protocols, etc.) can be in a state
25 of development where the functionality, stability, or the level of
26 testing is not yet high enough for general use. This is usually
27 known as the "alpha-test" phase among developers. If a feature is
28 currently in alpha-test, then the developers usually discourage
29 uninformed widespread use of this feature by the general public to
30 avoid "Why doesn't this work?" type mail messages. However, active
31 testing and use of these systems is welcomed. Just be aware that it
32 may not meet the normal level of reliability or it may fail to work
33 in some special cases. Detailed bug reports from people familiar
34 with the kernel internals are usually welcomed by the developers
35 (before submitting bug reports, please read the documents
36 <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
37 <file:Documentation/BUG-HUNTING>, and
38 <file:Documentation/oops-tracing.txt> in the kernel source).
39
40 This option will also make obsoleted drivers available. These are
41 drivers that have been replaced by something else, and/or are
42 scheduled to be removed in a future kernel release.
43
44 Unless you intend to help test and develop a feature or driver that
45 falls into this category, or you have a situation that requires
46 using these features, you should probably say N here, which will
47 cause the configurator to present you with fewer choices. If
48 you say Y here, you will be offered the choice of using features or
49 drivers that are currently considered to be in the alpha-test phase.
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051config BROKEN
52 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54config BROKEN_ON_SMP
55 bool
56 depends on BROKEN || !SMP
57 default y
58
59config LOCK_KERNEL
60 bool
61 depends on SMP || PREEMPT
62 default y
63
64config INIT_ENV_ARG_LIMIT
65 int
Adrian Bunkdd673bc2006-06-30 01:55:51 -070066 default 32 if !UML
67 default 128 if UML
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 help
Randy Dunlap34ad92c2005-10-30 15:01:46 -080069 Maximum of each of the number of arguments and environment
70 variables passed to init from the kernel command line.
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73config LOCALVERSION
74 string "Local version - append to kernel release"
75 help
76 Append an extra string to the end of your kernel version.
77 This will show up when you type uname, for example.
78 The string you set here will be appended after the contents of
79 any files with a filename matching localversion* in your
80 object and source tree, in that order. Your total string can
81 be a maximum of 64 characters.
82
Ryan Andersonaaebf432005-07-31 04:57:49 -040083config LOCALVERSION_AUTO
84 bool "Automatically append version information to the version string"
85 default y
86 help
87 This will try to automatically determine if the current tree is a
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020088 release tree by looking for git tags that belong to the current
89 top of tree revision.
Ryan Andersonaaebf432005-07-31 04:57:49 -040090
91 A string of the format -gxxxxxxxx will be added to the localversion
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020092 if a git-based tree is found. The string generated by this will be
Ryan Andersonaaebf432005-07-31 04:57:49 -040093 appended after any matching localversion* files, and after the value
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020094 set in CONFIG_LOCALVERSION.
Ryan Andersonaaebf432005-07-31 04:57:49 -040095
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020096 (The actual string used here is the first eight characters produced
97 by running the command:
98
99 $ git rev-parse --verify HEAD
100
101 which is done within the script "scripts/setlocalversion".)
Ryan Andersonaaebf432005-07-31 04:57:49 -0400102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103config SWAP
104 bool "Support for paging of anonymous memory (swap)"
David Howells93614012006-09-30 20:45:40 +0200105 depends on MMU && BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 default y
107 help
108 This option allows you to choose whether you want to have support
Jesper Juhl92c35042006-01-15 02:40:08 +0100109 for so called swap devices or swap files in your kernel that are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 used to provide more virtual memory than the actual RAM present
111 in your computer. If unsure say Y.
112
113config SYSVIPC
114 bool "System V IPC"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 ---help---
116 Inter Process Communication is a suite of library functions and
117 system calls which let processes (running programs) synchronize and
118 exchange information. It is generally considered to be a good thing,
119 and some programs won't run unless you say Y here. In particular, if
120 you want to run the DOS emulator dosemu under Linux (read the
121 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
122 you'll need to say Y here.
123
124 You can find documentation about IPC with "info ipc" and also in
125 section 6.4 of the Linux Programmer's Guide, available from
126 <http://www.tldp.org/guides.html>.
127
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800128config SYSVIPC_SYSCTL
129 bool
130 depends on SYSVIPC
131 depends on SYSCTL
132 default y
133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134config POSIX_MQUEUE
135 bool "POSIX Message Queues"
136 depends on NET && EXPERIMENTAL
137 ---help---
138 POSIX variant of message queues is a part of IPC. In POSIX message
139 queues every message has a priority which decides about succession
140 of receiving it by a process. If you want to compile and run
141 programs written e.g. for Solaris with use of its POSIX message
Robert P. J. Dayb0e37652007-05-09 07:25:13 +0200142 queues (functions mq_*) say Y here.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144 POSIX message queues are visible as a filesystem called 'mqueue'
145 and can be mounted somewhere if you want to do filesystem
146 operations on message queues.
147
148 If unsure, say Y.
149
150config BSD_PROCESS_ACCT
151 bool "BSD Process Accounting"
152 help
153 If you say Y here, a user level program will be able to instruct the
154 kernel (via a special system call) to write process accounting
155 information to a file: whenever a process exits, information about
156 that process will be appended to the file by the kernel. The
157 information includes things such as creation time, owning user,
158 command name, memory usage, controlling terminal etc. (the complete
159 list is in the struct acct in <file:include/linux/acct.h>). It is
160 up to the user level program to do useful things with this
161 information. This is generally a good idea, so say Y.
162
163config BSD_PROCESS_ACCT_V3
164 bool "BSD Process Accounting version 3 file format"
165 depends on BSD_PROCESS_ACCT
166 default n
167 help
168 If you say Y here, the process accounting information is written
169 in a new file format that also logs the process IDs of each
170 process and it's parent. Note that this file format is incompatible
171 with previous v0/v1/v2 file formats, so you will need updated tools
172 for processing it. A preliminary version of these tools is available
173 at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
174
Shailabh Nagarc7572492006-07-14 00:24:40 -0700175config TASKSTATS
176 bool "Export task/process statistics through netlink (EXPERIMENTAL)"
177 depends on NET
178 default n
179 help
180 Export selected statistics for tasks/processes through the
181 generic netlink interface. Unlike BSD process accounting, the
182 statistics are available during the lifetime of tasks/processes as
183 responses to commands. Like BSD accounting, they are sent to user
184 space on task exit.
185
186 Say N if unsure.
187
Shailabh Nagarca74e922006-07-14 00:24:36 -0700188config TASK_DELAY_ACCT
189 bool "Enable per-task delay accounting (EXPERIMENTAL)"
Shailabh Nagar6f449932006-07-14 00:24:41 -0700190 depends on TASKSTATS
Shailabh Nagarca74e922006-07-14 00:24:36 -0700191 help
192 Collect information on time spent by a task waiting for system
193 resources like cpu, synchronous block I/O completion and swapping
194 in pages. Such statistics can help in setting a task's priorities
195 relative to other tasks for cpu, io, rss limits etc.
196
197 Say N if unsure.
198
Alexey Dobriyan18f705f2007-02-10 01:46:44 -0800199config TASK_XACCT
200 bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
201 depends on TASKSTATS
202 help
203 Collect extended task accounting data and send the data
204 to userland for processing over the taskstats interface.
205
206 Say N if unsure.
207
208config TASK_IO_ACCOUNTING
209 bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
210 depends on TASK_XACCT
211 help
212 Collect information on the number of bytes of storage I/O which this
213 task has caused.
214
215 Say N if unsure.
216
Cedric Le Goateracce2922007-07-15 23:40:59 -0700217config USER_NS
218 bool "User Namespaces (EXPERIMENTAL)"
219 default n
220 depends on EXPERIMENTAL
221 help
222 Support user namespaces. This allows containers, i.e.
223 vservers, to use user namespaces to provide different
224 user info for different servers. If unsure, say N.
225
Eric W. Biederman57d5f662007-11-14 17:00:13 -0800226config PID_NS
227 bool "PID Namespaces (EXPERIMENTAL)"
228 default n
229 depends on EXPERIMENTAL
230 help
231 Suport process id namespaces. This allows having multiple
232 process with the same pid as long as they are in different
233 pid namespaces. This is a building block of containers.
234
235 Unless you want to work with an experimental feature
236 say N here.
237
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238config AUDIT
239 bool "Auditing support"
Chris Wright804a6a492005-05-11 10:52:45 +0100240 depends on NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 help
242 Enable auditing infrastructure that can be used with another
243 kernel subsystem, such as SELinux (which requires this for
244 logging of avc messages output). Does not do system-call
245 auditing without CONFIG_AUDITSYSCALL.
246
247config AUDITSYSCALL
248 bool "Enable system-call auditing support"
Yuichi Nakamura1322b9d2007-11-10 19:21:34 +0900249 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 default y if SECURITY_SELINUX
251 help
252 Enable low-overhead system-call auditing infrastructure that
253 can be used independently or with another kernel subsystem,
Amy Griffisf368c07d2006-04-07 16:55:56 -0400254 such as SELinux. To use audit's filesystem watch feature, please
255 ensure that INOTIFY is configured.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Al Viro74c3cbe2007-07-22 08:04:18 -0400257config AUDIT_TREE
258 def_bool y
259 depends on AUDITSYSCALL && INOTIFY
260
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261config IKCONFIG
Ross Birof2443ab2006-09-30 23:27:25 -0700262 tristate "Kernel .config support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 ---help---
264 This option enables the complete Linux kernel ".config" file
265 contents to be saved in the kernel. It provides documentation
266 of which kernel options are used in a running kernel or in an
267 on-disk kernel. This information can be extracted from the kernel
268 image file with the script scripts/extract-ikconfig and used as
269 input to rebuild the current kernel or to build another kernel.
270 It can also be extracted from a running kernel by reading
271 /proc/config.gz if enabled (below).
272
273config IKCONFIG_PROC
274 bool "Enable access to .config through /proc/config.gz"
275 depends on IKCONFIG && PROC_FS
276 ---help---
277 This option enables access to the kernel configuration file
278 through /proc/config.gz.
279
Alistair John Strachan794543a2007-05-08 00:31:15 -0700280config LOG_BUF_SHIFT
281 int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
282 range 12 21
283 default 17 if S390 || LOCKDEP
284 default 16 if X86_NUMAQ || IA64
285 default 15 if SMP
286 default 14
287 help
288 Select kernel log buffer size as a power of 2.
289 Defaults and Examples:
290 17 => 128 KB for S/390
291 16 => 64 KB for x86 NUMAQ or IA-64
292 15 => 32 KB for SMP
293 14 => 16 KB for uniprocessor
294 13 => 8 KB
295 12 => 4 KB
296
Paul Menageddbcc7e2007-10-18 23:39:30 -0700297config CGROUPS
298 bool "Control Group support"
299 help
300 This option will let you use process cgroup subsystems
301 such as Cpusets
302
303 Say N if unsure.
304
Paul Menage006cb992007-10-18 23:39:43 -0700305config CGROUP_DEBUG
306 bool "Example debug cgroup subsystem"
307 depends on CGROUPS
308 help
309 This option enables a simple cgroup subsystem that
310 exports useful debugging information about the cgroups
311 framework
312
313 Say N if unsure
314
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700315config CGROUP_NS
316 bool "Namespace cgroup subsystem"
317 depends on CGROUPS
318 help
319 Provides a simple namespace cgroup subsystem to
320 provide hierarchical naming of sets of namespaces,
321 for instance virtual servers and checkpoint/restart
322 jobs.
323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324config CPUSETS
325 bool "Cpuset support"
Paul Menage8793d852007-10-18 23:39:39 -0700326 depends on SMP && CGROUPS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700328 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 allow dynamically partitioning a system into sets of CPUs and
330 Memory Nodes and assigning tasks to run only within those sets.
331 This is primarily useful on large SMP or NUMA systems.
332
333 Say N if unsure.
334
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200335config FAIR_GROUP_SCHED
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200336 bool "Fair group CPU scheduler"
Ingo Molnarde8d5852007-10-15 17:00:09 +0200337 default y
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200338 help
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200339 This feature lets CPU scheduler recognize task groups and control CPU
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +0200340 bandwidth allocation to such task groups.
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200341
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200342choice
343 depends on FAIR_GROUP_SCHED
344 prompt "Basis for grouping tasks"
345 default FAIR_USER_SCHED
346
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200347config FAIR_USER_SCHED
348 bool "user id"
349 help
350 This option will choose userid as the basis for grouping
351 tasks, thus providing equal CPU bandwidth to each user.
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200352
Srivatsa Vaddagiri68318b82007-10-18 23:41:03 -0700353config FAIR_CGROUP_SCHED
354 bool "Control groups"
355 depends on CGROUPS
356 help
357 This option allows you to create arbitrary task groups
358 using the "cgroup" pseudo filesystem and control
359 the cpu bandwidth allocated to each such task group.
360 Refer to Documentation/cgroups.txt for more information
361 on "cgroup" pseudo filesystem.
362
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200363endchoice
364
Srivatsa Vaddagirid842de82007-12-02 20:04:49 +0100365config CGROUP_CPUACCT
366 bool "Simple CPU accounting cgroup subsystem"
367 depends on CGROUPS
368 help
369 Provides a simple Resource Controller for monitoring the
370 total CPU consumed by the tasks in a cgroup
371
Kay Sievers88a22c92006-09-14 11:23:28 +0200372config SYSFS_DEPRECATED
373 bool "Create deprecated sysfs files"
Randy Dunlap9148fe82007-12-31 10:05:34 -0800374 depends on SYSFS
Kay Sievers88a22c92006-09-14 11:23:28 +0200375 default y
376 help
377 This option creates deprecated symlinks such as the
378 "device"-link, the <subsystem>:<name>-link, and the
379 "bus"-link. It may also add deprecated key in the
380 uevent environment.
381 None of these features or values should be used today, as
382 they export driver core implementation details to userspace
383 or export properties which can't be kept stable across kernel
384 releases.
385
386 If enabled, this option will also move any device structures
David Sterba3dde6ad2007-05-09 07:12:20 +0200387 that belong to a class, back into the /sys/class hierarchy, in
Kay Sievers88a22c92006-09-14 11:23:28 +0200388 order to support older versions of udev.
389
390 If you are using a distro that was released in 2006 or later,
391 it should be safe to say N here.
392
Paul Menage8793d852007-10-18 23:39:39 -0700393config PROC_PID_CPUSET
394 bool "Include legacy /proc/<pid>/cpuset file"
395 depends on CPUSETS
396 default y
397
Jens Axboeb86ff9812006-03-23 19:56:55 +0100398config RELAY
399 bool "Kernel->user space relay support (formerly relayfs)"
400 help
401 This option enables support for relay interface support in
402 certain file systems (such as debugfs).
403 It is designed to provide an efficient mechanism for tools and
404 facilities to relay large amounts of data from kernel space to
405 user space.
406
407 If unsure, say N.
408
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800409config BLK_DEV_INITRD
410 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
411 depends on BROKEN || !FRV
412 help
413 The initial RAM filesystem is a ramfs which is loaded by the
414 boot loader (loadlin or lilo) and that is mounted as root
415 before the normal boot procedure. It is typically used to
416 load modules needed to mount the "real" root file system,
417 etc. See <file:Documentation/initrd.txt> for details.
418
419 If RAM disk support (BLK_DEV_RAM) is also included, this
420 also enables initial RAM disk (initrd) support and adds
421 15 Kbytes (more on some other architectures) to the kernel size.
422
423 If unsure say Y.
424
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800425if BLK_DEV_INITRD
426
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200427source "usr/Kconfig"
428
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800429endif
430
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800431config CC_OPTIMIZE_FOR_SIZE
432 bool "Optimize for size (Look out for broken compilers!)"
433 default y
Paul Mundt32582fa2007-07-25 11:27:05 +0900434 depends on ARM || H8300 || SUPERH || EXPERIMENTAL
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800435 help
436 Enabling this option will pass "-Os" instead of "-O2" to gcc
437 resulting in a smaller kernel.
438
439 WARNING: some versions of gcc may generate incorrect code with this
440 option. If problems are observed, a gcc upgrade may be needed.
441
442 If unsure, say N.
443
Randy Dunlap08470622006-09-30 23:28:13 -0700444config SYSCTL
445 bool
446
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447menuconfig EMBEDDED
448 bool "Configure standard kernel features (for small systems)"
449 help
450 This option allows certain base kernel options and settings
451 to be disabled or tweaked. This is for specialized
452 environments which can tolerate a "non-standard" kernel.
453 Only use this if you really know what you are doing.
454
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700455config UID16
456 bool "Enable 16-bit UID system calls" if EMBEDDED
Mike Frysinger529a73f2007-11-23 14:28:44 +0800457 depends on ARM || BLACKFIN || 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 -0700458 default y
459 help
460 This enables the legacy 16-bit UID syscall wrappers.
461
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700462config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700463 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800464 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700465 select SYSCTL
466 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800467 sys_sysctl uses binary paths that have been found challenging
468 to properly maintain and use. The interface in /proc/sys
469 using paths with ascii names is now the primary path to this
470 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700471
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800472 Almost nothing using the binary sysctl interface so if you are
473 trying to save some space it is probably safe to disable this,
474 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700475
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800476 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700477
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100479 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 default y
481 help
482 Say Y here to let the kernel print out symbolic crash information and
483 symbolic stack backtraces. This increases the size of the kernel
484 somewhat, as all symbols have to be loaded into the kernel image.
485
486config KALLSYMS_ALL
487 bool "Include all symbols in kallsyms"
488 depends on DEBUG_KERNEL && KALLSYMS
489 help
490 Normally kallsyms only contains the symbols of functions, for nicer
491 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200492 symbols too: say Y here to include all symbols, if you need them
493 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
495 Say N.
496
497config KALLSYMS_EXTRA_PASS
498 bool "Do an extra kallsyms pass"
499 depends on KALLSYMS
500 help
501 If kallsyms is not working correctly, the build will fail with
502 inconsistent kallsyms data. If that occurs, log a bug report and
503 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
504 Always say N here unless you find a bug in kallsyms, which must be
505 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
506 you wait for kallsyms to be fixed.
507
Matt Mackalld59745c2005-05-01 08:59:02 -0700508
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800509config HOTPLUG
510 bool "Support for hot-pluggable devices" if EMBEDDED
511 default y
512 help
513 This option is provided for the case where no hotplug or uevent
514 capabilities is wanted by the kernel. You should only consider
515 disabling this option for embedded systems that do not use modules, a
516 dynamic /dev tree, or dynamic device discovery. Just say Y.
517
Matt Mackalld59745c2005-05-01 08:59:02 -0700518config PRINTK
519 default y
520 bool "Enable support for printk" if EMBEDDED
521 help
522 This option enables normal printk support. Removing it
523 eliminates most of the message strings from the kernel image
524 and makes the kernel more or less silent. As this makes it
525 very difficult to diagnose system problems, saying N here is
526 strongly discouraged.
527
Matt Mackallc8538a72005-05-01 08:59:01 -0700528config BUG
529 bool "BUG() support" if EMBEDDED
530 default y
531 help
532 Disabling this option eliminates support for BUG and WARN, reducing
533 the size of your kernel image and potentially quietly ignoring
534 numerous fatal conditions. You should only consider disabling this
535 option for embedded systems with no facilities for reporting errors.
536 Just say Y.
537
Matt Mackall708e9a72006-01-08 01:05:25 -0800538config ELF_CORE
539 default y
540 bool "Enable ELF core dumps" if EMBEDDED
541 help
542 Enable support for generating core dumps. Disabling saves about 4k.
543
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544config BASE_FULL
545 default y
546 bool "Enable full-sized data structures for core" if EMBEDDED
547 help
548 Disabling this option reduces the size of miscellaneous core
549 kernel data structures. This saves memory on small machines,
550 but may reduce performance.
551
552config FUTEX
553 bool "Enable futex support" if EMBEDDED
554 default y
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700555 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 help
557 Disabling this option will cause the kernel to be built without
558 support for "fast userspace mutexes". The resulting kernel may not
559 run glibc-based applications correctly.
560
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700561config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700562 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700563
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564config EPOLL
565 bool "Enable eventpoll support" if EMBEDDED
566 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700567 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 help
569 Disabling this option will cause the kernel to be built without
570 support for epoll family of system calls.
571
Davide Libenzifba2afa2007-05-10 22:23:13 -0700572config SIGNALFD
573 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700574 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700575 default y
576 help
577 Enable the signalfd() system call that allows to receive signals
578 on a file descriptor.
579
580 If unsure, say Y.
581
Davide Libenzib215e282007-05-10 22:23:16 -0700582config TIMERFD
583 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700584 select ANON_INODES
Andrew Mortone4260192007-09-18 22:46:41 -0700585 depends on BROKEN
Davide Libenzib215e282007-05-10 22:23:16 -0700586 default y
587 help
588 Enable the timerfd() system call that allows to receive timer
589 events on a file descriptor.
590
591 If unsure, say Y.
592
Davide Libenzie1ad7462007-05-10 22:23:19 -0700593config EVENTFD
594 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700595 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700596 default y
597 help
598 Enable the eventfd() system call that allows to receive both
599 kernel notification (ie. KAIO) or userspace notifications.
600
601 If unsure, say Y.
602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603config SHMEM
604 bool "Use full shmem filesystem" if EMBEDDED
605 default y
606 depends on MMU
607 help
608 The shmem is an internal filesystem used to manage shared memory.
609 It is backed by swap and manages resource limits. It is also exported
610 to userspace as tmpfs if TMPFS is enabled. Disabling this
611 option replaces shmem and tmpfs with the much simpler ramfs code,
612 which may be appropriate on small systems without swap.
613
Christoph Lameterf8891e52006-06-30 01:55:45 -0700614config VM_EVENT_COUNTERS
615 default y
616 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
617 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800618 VM event counters are needed for event counts to be shown.
619 This option allows the disabling of the VM event counters
620 on EMBEDDED systems. /proc/vmstat will only show page counts
621 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700622
Christoph Lameter41ecc552007-05-09 02:32:44 -0700623config SLUB_DEBUG
624 default y
625 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterd4751a22007-05-10 03:15:40 -0700626 depends on SLUB
Christoph Lameter41ecc552007-05-09 02:32:44 -0700627 help
628 SLUB has extensive debug support features. Disabling these can
629 result in significant savings in code size. This also disables
630 SLUB sysfs support. /sys/slab will not exist and there will be
631 no support for cache validation etc.
632
Christoph Lameter81819f02007-05-06 14:49:36 -0700633choice
634 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700635 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700636 help
637 This option allows to select a slab allocator.
638
639config SLAB
640 bool "SLAB"
641 help
642 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700643 well in all environments. It organizes cache hot objects in
Christoph Lameter81819f02007-05-06 14:49:36 -0700644 per cpu and per node queues. SLAB is the default choice for
Christoph Lameter34013882007-05-09 02:32:47 -0700645 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700646
647config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700648 bool "SLUB (Unqueued Allocator)"
649 help
650 SLUB is a slab allocator that minimizes cache line usage
651 instead of managing queues of cached objects (SLAB approach).
652 Per cpu caching is realized using slabs of objects instead
653 of queues of objects. SLUB can use memory efficiently
Christoph Lameter34013882007-05-09 02:32:47 -0700654 and has enhanced diagnostics.
Christoph Lameter81819f02007-05-06 14:49:36 -0700655
656config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700657 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700658 bool "SLOB (Simple Allocator)"
659 help
660 SLOB replaces the SLAB allocator with a drastically simpler
Nick Pigginafc0ced2007-05-16 22:10:49 -0700661 allocator. SLOB is more space efficient than SLAB but does not
Christoph Lameter34013882007-05-09 02:32:47 -0700662 scale well (single lock for all operations) and is also highly
663 susceptible to fragmentation. SLUB can accomplish a higher object
664 density. It is usually better to use SLUB instead of SLOB.
Christoph Lameter81819f02007-05-06 14:49:36 -0700665
666endchoice
667
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668endmenu # General setup
669
Linus Torvalds158a9622008-01-02 13:04:48 -0800670config SLABINFO
671 bool
672 depends on PROC_FS
673 depends on SLAB || SLUB
674 default y
675
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700676config RT_MUTEXES
677 boolean
678 select PLIST
679
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680config TINY_SHMEM
681 default !SHMEM
682 bool
683
684config BASE_SMALL
685 int
686 default 0 if BASE_FULL
687 default 1 if !BASE_FULL
688
Jan Engelhardt66da5732007-07-15 23:39:29 -0700689menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 bool "Enable loadable module support"
691 help
692 Kernel modules are small pieces of compiled code which can
693 be inserted in the running kernel, rather than being
694 permanently built into the kernel. You use the "modprobe"
695 tool to add (and sometimes remove) them. If you say Y here,
696 many parts of the kernel can be built as modules (by
697 answering M instead of Y where indicated): this is most
698 useful for infrequently used options which are not required
699 for booting. For more information, see the man pages for
700 modprobe, lsmod, modinfo, insmod and rmmod.
701
702 If you say Y here, you will need to run "make
703 modules_install" to put the modules under /lib/modules/
704 where modprobe can find them (you may need to be root to do
705 this).
706
707 If unsure, say Y.
708
709config MODULE_UNLOAD
710 bool "Module unloading"
711 depends on MODULES
712 help
713 Without this option you will not be able to unload any
714 modules (note that some modules may not be unloadable
715 anyway), which makes your kernel slightly smaller and
716 simpler. If unsure, say Y.
717
718config MODULE_FORCE_UNLOAD
719 bool "Forced module unloading"
720 depends on MODULE_UNLOAD && EXPERIMENTAL
721 help
722 This option allows you to force a module to unload, even if the
723 kernel believes it is unsafe: the kernel will remove the module
724 without waiting for anyone to stop using it (using the -f option to
725 rmmod). This is mainly for kernel developers and desperate users.
726 If unsure, say N.
727
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100729 bool "Module versioning support"
730 depends on MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 help
732 Usually, you have to use modules compiled with your kernel.
733 Saying Y here makes it sometimes possible to use modules
734 compiled for different kernels, by adding enough information
735 to the modules to (hopefully) spot any changes which would
736 make them incompatible with the kernel you are running. If
737 unsure, say N.
738
739config MODULE_SRCVERSION_ALL
740 bool "Source checksum for all modules"
741 depends on MODULES
742 help
743 Modules which contain a MODULE_VERSION get an extra "srcversion"
744 field inserted into their modinfo section, which contains a
745 sum of the source files which made it. This helps maintainers
746 see exactly which source was used to build a module (since
747 others sometimes change the module source without updating
748 the version). With this option, such a "srcversion" field
749 will be created for all modules. If unsure, say N.
750
751config KMOD
752 bool "Automatic kernel module loading"
753 depends on MODULES
754 help
755 Normally when you have selected some parts of the kernel to
756 be created as kernel modules, you must load them (using the
757 "modprobe" command) before you can use them. If you say Y
758 here, some parts of the kernel will be able to load modules
759 automatically: when a part of the kernel needs a module, it
760 runs modprobe with the appropriate arguments, thereby
761 loading the module if it is available. If unsure, say Y.
762
763config STOP_MACHINE
764 bool
765 default y
766 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
767 help
768 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100769
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100770source "block/Kconfig"
Avi Kivitye98c3202007-10-16 23:27:31 -0700771
772config PREEMPT_NOTIFIERS
773 bool
Paul E. McKenneye260be62008-01-25 21:08:24 +0100774
775choice
776 prompt "RCU implementation type:"
777 default CLASSIC_RCU
Paul E. McKenney09503102008-01-31 22:45:22 +0100778 help
779 This allows you to choose either the classic RCU implementation
780 that is designed for best read-side performance on non-realtime
781 systems, or the preemptible RCU implementation for best latency
782 on realtime systems. Note that some kernel preemption modes
783 will restrict your choice.
784
785 Select the default if you are unsure.
Paul E. McKenneye260be62008-01-25 21:08:24 +0100786
787config CLASSIC_RCU
788 bool "Classic RCU"
789 help
790 This option selects the classic RCU implementation that is
791 designed for best read-side performance on non-realtime
792 systems.
793
794 Say Y if you are unsure.
795
796config PREEMPT_RCU
797 bool "Preemptible RCU"
798 depends on PREEMPT
799 help
800 This option reduces the latency of the kernel by making certain
801 RCU sections preemptible. Normally RCU code is non-preemptible, if
802 this option is selected then read-only RCU sections become
803 preemptible. This helps latency, but may expose bugs due to
804 now-naive assumptions about each RCU read-side critical section
805 remaining on a given CPU through its execution.
806
807 Say N if you are unsure.
808
809endchoice