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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33 drivers that have been replaced by something else, and/or are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
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
263 default 17 if S390 || LOCKDEP
264 default 16 if X86_NUMAQ || IA64
265 default 15 if SMP
266 default 14
267 help
268 Select kernel log buffer size as a power of 2.
269 Defaults and Examples:
270 17 => 128 KB for S/390
271 16 => 64 KB for x86 NUMAQ or IA-64
272 15 => 32 KB for SMP
273 14 => 16 KB for uniprocessor
274 13 => 8 KB
275 12 => 4 KB
276
Paul Menageddbcc7e2007-10-18 23:39:30 -0700277config CGROUPS
278 bool "Control Group support"
279 help
280 This option will let you use process cgroup subsystems
281 such as Cpusets
282
283 Say N if unsure.
284
Paul Menage006cb992007-10-18 23:39:43 -0700285config CGROUP_DEBUG
286 bool "Example debug cgroup subsystem"
287 depends on CGROUPS
288 help
289 This option enables a simple cgroup subsystem that
290 exports useful debugging information about the cgroups
291 framework
292
293 Say N if unsure
294
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700295config CGROUP_NS
296 bool "Namespace cgroup subsystem"
297 depends on CGROUPS
298 help
299 Provides a simple namespace cgroup subsystem to
300 provide hierarchical naming of sets of namespaces,
301 for instance virtual servers and checkpoint/restart
302 jobs.
303
304config CGROUP_CPUACCT
305 bool "Simple CPU accounting cgroup subsystem"
306 depends on CGROUPS
307 help
308 Provides a simple Resource Controller for monitoring the
309 total CPU consumed by the tasks in a cgroup
310
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311config CPUSETS
312 bool "Cpuset support"
Paul Menage8793d852007-10-18 23:39:39 -0700313 depends on SMP && CGROUPS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700315 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 allow dynamically partitioning a system into sets of CPUs and
317 Memory Nodes and assigning tasks to run only within those sets.
318 This is primarily useful on large SMP or NUMA systems.
319
320 Say N if unsure.
321
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200322config FAIR_GROUP_SCHED
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200323 bool "Fair group CPU scheduler"
Ingo Molnarde8d5852007-10-15 17:00:09 +0200324 default y
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200325 help
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200326 This feature lets CPU scheduler recognize task groups and control CPU
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +0200327 bandwidth allocation to such task groups.
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200328
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200329choice
330 depends on FAIR_GROUP_SCHED
331 prompt "Basis for grouping tasks"
332 default FAIR_USER_SCHED
333
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200334config FAIR_USER_SCHED
335 bool "user id"
336 help
337 This option will choose userid as the basis for grouping
338 tasks, thus providing equal CPU bandwidth to each user.
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200339
Srivatsa Vaddagiri68318b82007-10-18 23:41:03 -0700340config FAIR_CGROUP_SCHED
341 bool "Control groups"
342 depends on CGROUPS
343 help
344 This option allows you to create arbitrary task groups
345 using the "cgroup" pseudo filesystem and control
346 the cpu bandwidth allocated to each such task group.
347 Refer to Documentation/cgroups.txt for more information
348 on "cgroup" pseudo filesystem.
349
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200350endchoice
351
Kay Sievers88a22c92006-09-14 11:23:28 +0200352config SYSFS_DEPRECATED
353 bool "Create deprecated sysfs files"
354 default y
355 help
356 This option creates deprecated symlinks such as the
357 "device"-link, the <subsystem>:<name>-link, and the
358 "bus"-link. It may also add deprecated key in the
359 uevent environment.
360 None of these features or values should be used today, as
361 they export driver core implementation details to userspace
362 or export properties which can't be kept stable across kernel
363 releases.
364
365 If enabled, this option will also move any device structures
David Sterba3dde6ad2007-05-09 07:12:20 +0200366 that belong to a class, back into the /sys/class hierarchy, in
Kay Sievers88a22c92006-09-14 11:23:28 +0200367 order to support older versions of udev.
368
369 If you are using a distro that was released in 2006 or later,
370 it should be safe to say N here.
371
Paul Menage8793d852007-10-18 23:39:39 -0700372config PROC_PID_CPUSET
373 bool "Include legacy /proc/<pid>/cpuset file"
374 depends on CPUSETS
375 default y
376
Jens Axboeb86ff9812006-03-23 19:56:55 +0100377config RELAY
378 bool "Kernel->user space relay support (formerly relayfs)"
379 help
380 This option enables support for relay interface support in
381 certain file systems (such as debugfs).
382 It is designed to provide an efficient mechanism for tools and
383 facilities to relay large amounts of data from kernel space to
384 user space.
385
386 If unsure, say N.
387
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800388config BLK_DEV_INITRD
389 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
390 depends on BROKEN || !FRV
391 help
392 The initial RAM filesystem is a ramfs which is loaded by the
393 boot loader (loadlin or lilo) and that is mounted as root
394 before the normal boot procedure. It is typically used to
395 load modules needed to mount the "real" root file system,
396 etc. See <file:Documentation/initrd.txt> for details.
397
398 If RAM disk support (BLK_DEV_RAM) is also included, this
399 also enables initial RAM disk (initrd) support and adds
400 15 Kbytes (more on some other architectures) to the kernel size.
401
402 If unsure say Y.
403
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800404if BLK_DEV_INITRD
405
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200406source "usr/Kconfig"
407
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800408endif
409
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800410config CC_OPTIMIZE_FOR_SIZE
411 bool "Optimize for size (Look out for broken compilers!)"
412 default y
Paul Mundt32582fa2007-07-25 11:27:05 +0900413 depends on ARM || H8300 || SUPERH || EXPERIMENTAL
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800414 help
415 Enabling this option will pass "-Os" instead of "-O2" to gcc
416 resulting in a smaller kernel.
417
418 WARNING: some versions of gcc may generate incorrect code with this
419 option. If problems are observed, a gcc upgrade may be needed.
420
421 If unsure, say N.
422
Randy Dunlap08470622006-09-30 23:28:13 -0700423config SYSCTL
424 bool
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426menuconfig EMBEDDED
427 bool "Configure standard kernel features (for small systems)"
428 help
429 This option allows certain base kernel options and settings
430 to be disabled or tweaked. This is for specialized
431 environments which can tolerate a "non-standard" kernel.
432 Only use this if you really know what you are doing.
433
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700434config UID16
435 bool "Enable 16-bit UID system calls" if EMBEDDED
Bryan Wu1394f032007-05-06 14:50:22 -0700436 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 -0700437 default y
438 help
439 This enables the legacy 16-bit UID syscall wrappers.
440
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700441config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700442 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800443 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700444 select SYSCTL
445 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800446 sys_sysctl uses binary paths that have been found challenging
447 to properly maintain and use. The interface in /proc/sys
448 using paths with ascii names is now the primary path to this
449 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700450
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800451 Almost nothing using the binary sysctl interface so if you are
452 trying to save some space it is probably safe to disable this,
453 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700454
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800455 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700456
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100458 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 default y
460 help
461 Say Y here to let the kernel print out symbolic crash information and
462 symbolic stack backtraces. This increases the size of the kernel
463 somewhat, as all symbols have to be loaded into the kernel image.
464
465config KALLSYMS_ALL
466 bool "Include all symbols in kallsyms"
467 depends on DEBUG_KERNEL && KALLSYMS
468 help
469 Normally kallsyms only contains the symbols of functions, for nicer
470 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200471 symbols too: say Y here to include all symbols, if you need them
472 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
474 Say N.
475
476config KALLSYMS_EXTRA_PASS
477 bool "Do an extra kallsyms pass"
478 depends on KALLSYMS
479 help
480 If kallsyms is not working correctly, the build will fail with
481 inconsistent kallsyms data. If that occurs, log a bug report and
482 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
483 Always say N here unless you find a bug in kallsyms, which must be
484 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
485 you wait for kallsyms to be fixed.
486
Matt Mackalld59745c2005-05-01 08:59:02 -0700487
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800488config HOTPLUG
489 bool "Support for hot-pluggable devices" if EMBEDDED
490 default y
491 help
492 This option is provided for the case where no hotplug or uevent
493 capabilities is wanted by the kernel. You should only consider
494 disabling this option for embedded systems that do not use modules, a
495 dynamic /dev tree, or dynamic device discovery. Just say Y.
496
Matt Mackalld59745c2005-05-01 08:59:02 -0700497config PRINTK
498 default y
499 bool "Enable support for printk" if EMBEDDED
500 help
501 This option enables normal printk support. Removing it
502 eliminates most of the message strings from the kernel image
503 and makes the kernel more or less silent. As this makes it
504 very difficult to diagnose system problems, saying N here is
505 strongly discouraged.
506
Matt Mackallc8538a72005-05-01 08:59:01 -0700507config BUG
508 bool "BUG() support" if EMBEDDED
509 default y
510 help
511 Disabling this option eliminates support for BUG and WARN, reducing
512 the size of your kernel image and potentially quietly ignoring
513 numerous fatal conditions. You should only consider disabling this
514 option for embedded systems with no facilities for reporting errors.
515 Just say Y.
516
Matt Mackall708e9a72006-01-08 01:05:25 -0800517config ELF_CORE
518 default y
519 bool "Enable ELF core dumps" if EMBEDDED
520 help
521 Enable support for generating core dumps. Disabling saves about 4k.
522
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523config BASE_FULL
524 default y
525 bool "Enable full-sized data structures for core" if EMBEDDED
526 help
527 Disabling this option reduces the size of miscellaneous core
528 kernel data structures. This saves memory on small machines,
529 but may reduce performance.
530
531config FUTEX
532 bool "Enable futex support" if EMBEDDED
533 default y
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700534 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 help
536 Disabling this option will cause the kernel to be built without
537 support for "fast userspace mutexes". The resulting kernel may not
538 run glibc-based applications correctly.
539
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700540config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700541 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543config EPOLL
544 bool "Enable eventpoll support" if EMBEDDED
545 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700546 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 help
548 Disabling this option will cause the kernel to be built without
549 support for epoll family of system calls.
550
Davide Libenzifba2afa2007-05-10 22:23:13 -0700551config SIGNALFD
552 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700553 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700554 default y
555 help
556 Enable the signalfd() system call that allows to receive signals
557 on a file descriptor.
558
559 If unsure, say Y.
560
Davide Libenzib215e282007-05-10 22:23:16 -0700561config TIMERFD
562 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700563 select ANON_INODES
Andrew Mortone4260192007-09-18 22:46:41 -0700564 depends on BROKEN
Davide Libenzib215e282007-05-10 22:23:16 -0700565 default y
566 help
567 Enable the timerfd() system call that allows to receive timer
568 events on a file descriptor.
569
570 If unsure, say Y.
571
Davide Libenzie1ad7462007-05-10 22:23:19 -0700572config EVENTFD
573 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700574 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700575 default y
576 help
577 Enable the eventfd() system call that allows to receive both
578 kernel notification (ie. KAIO) or userspace notifications.
579
580 If unsure, say Y.
581
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582config SHMEM
583 bool "Use full shmem filesystem" if EMBEDDED
584 default y
585 depends on MMU
586 help
587 The shmem is an internal filesystem used to manage shared memory.
588 It is backed by swap and manages resource limits. It is also exported
589 to userspace as tmpfs if TMPFS is enabled. Disabling this
590 option replaces shmem and tmpfs with the much simpler ramfs code,
591 which may be appropriate on small systems without swap.
592
Christoph Lameterf8891e52006-06-30 01:55:45 -0700593config VM_EVENT_COUNTERS
594 default y
595 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
596 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800597 VM event counters are needed for event counts to be shown.
598 This option allows the disabling of the VM event counters
599 on EMBEDDED systems. /proc/vmstat will only show page counts
600 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700601
Christoph Lameter41ecc552007-05-09 02:32:44 -0700602config SLUB_DEBUG
603 default y
604 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterd4751a22007-05-10 03:15:40 -0700605 depends on SLUB
Christoph Lameter41ecc552007-05-09 02:32:44 -0700606 help
607 SLUB has extensive debug support features. Disabling these can
608 result in significant savings in code size. This also disables
609 SLUB sysfs support. /sys/slab will not exist and there will be
610 no support for cache validation etc.
611
Christoph Lameter81819f02007-05-06 14:49:36 -0700612choice
613 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700614 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700615 help
616 This option allows to select a slab allocator.
617
618config SLAB
619 bool "SLAB"
620 help
621 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700622 well in all environments. It organizes cache hot objects in
Christoph Lameter81819f02007-05-06 14:49:36 -0700623 per cpu and per node queues. SLAB is the default choice for
Christoph Lameter34013882007-05-09 02:32:47 -0700624 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700625
626config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700627 bool "SLUB (Unqueued Allocator)"
628 help
629 SLUB is a slab allocator that minimizes cache line usage
630 instead of managing queues of cached objects (SLAB approach).
631 Per cpu caching is realized using slabs of objects instead
632 of queues of objects. SLUB can use memory efficiently
Christoph Lameter34013882007-05-09 02:32:47 -0700633 and has enhanced diagnostics.
Christoph Lameter81819f02007-05-06 14:49:36 -0700634
635config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700636 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700637 bool "SLOB (Simple Allocator)"
638 help
639 SLOB replaces the SLAB allocator with a drastically simpler
Nick Pigginafc0ced2007-05-16 22:10:49 -0700640 allocator. SLOB is more space efficient than SLAB but does not
Christoph Lameter34013882007-05-09 02:32:47 -0700641 scale well (single lock for all operations) and is also highly
642 susceptible to fragmentation. SLUB can accomplish a higher object
643 density. It is usually better to use SLUB instead of SLOB.
Christoph Lameter81819f02007-05-06 14:49:36 -0700644
645endchoice
646
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647endmenu # General setup
648
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700649config RT_MUTEXES
650 boolean
651 select PLIST
652
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653config TINY_SHMEM
654 default !SHMEM
655 bool
656
657config BASE_SMALL
658 int
659 default 0 if BASE_FULL
660 default 1 if !BASE_FULL
661
Jan Engelhardt66da5732007-07-15 23:39:29 -0700662menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 bool "Enable loadable module support"
664 help
665 Kernel modules are small pieces of compiled code which can
666 be inserted in the running kernel, rather than being
667 permanently built into the kernel. You use the "modprobe"
668 tool to add (and sometimes remove) them. If you say Y here,
669 many parts of the kernel can be built as modules (by
670 answering M instead of Y where indicated): this is most
671 useful for infrequently used options which are not required
672 for booting. For more information, see the man pages for
673 modprobe, lsmod, modinfo, insmod and rmmod.
674
675 If you say Y here, you will need to run "make
676 modules_install" to put the modules under /lib/modules/
677 where modprobe can find them (you may need to be root to do
678 this).
679
680 If unsure, say Y.
681
682config MODULE_UNLOAD
683 bool "Module unloading"
684 depends on MODULES
685 help
686 Without this option you will not be able to unload any
687 modules (note that some modules may not be unloadable
688 anyway), which makes your kernel slightly smaller and
689 simpler. If unsure, say Y.
690
691config MODULE_FORCE_UNLOAD
692 bool "Forced module unloading"
693 depends on MODULE_UNLOAD && EXPERIMENTAL
694 help
695 This option allows you to force a module to unload, even if the
696 kernel believes it is unsafe: the kernel will remove the module
697 without waiting for anyone to stop using it (using the -f option to
698 rmmod). This is mainly for kernel developers and desperate users.
699 If unsure, say N.
700
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100702 bool "Module versioning support"
703 depends on MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 help
705 Usually, you have to use modules compiled with your kernel.
706 Saying Y here makes it sometimes possible to use modules
707 compiled for different kernels, by adding enough information
708 to the modules to (hopefully) spot any changes which would
709 make them incompatible with the kernel you are running. If
710 unsure, say N.
711
712config MODULE_SRCVERSION_ALL
713 bool "Source checksum for all modules"
714 depends on MODULES
715 help
716 Modules which contain a MODULE_VERSION get an extra "srcversion"
717 field inserted into their modinfo section, which contains a
718 sum of the source files which made it. This helps maintainers
719 see exactly which source was used to build a module (since
720 others sometimes change the module source without updating
721 the version). With this option, such a "srcversion" field
722 will be created for all modules. If unsure, say N.
723
724config KMOD
725 bool "Automatic kernel module loading"
726 depends on MODULES
727 help
728 Normally when you have selected some parts of the kernel to
729 be created as kernel modules, you must load them (using the
730 "modprobe" command) before you can use them. If you say Y
731 here, some parts of the kernel will be able to load modules
732 automatically: when a part of the kernel needs a module, it
733 runs modprobe with the appropriate arguments, thereby
734 loading the module if it is available. If unsure, say Y.
735
736config STOP_MACHINE
737 bool
738 default y
739 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
740 help
741 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100742
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100743source "block/Kconfig"
Avi Kivitye98c3202007-10-16 23:27:31 -0700744
745config PREEMPT_NOTIFIERS
746 bool