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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41 drivers that have been replaced by something else, and/or are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
Eric W. Biederman57d5f662007-11-14 17:00:13 -0800217config PID_NS
218 bool "PID Namespaces (EXPERIMENTAL)"
219 default n
220 depends on EXPERIMENTAL
221 help
222 Suport process id namespaces. This allows having multiple
223 process with the same pid as long as they are in different
224 pid namespaces. This is a building block of containers.
225
226 Unless you want to work with an experimental feature
227 say N here.
228
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229config AUDIT
230 bool "Auditing support"
Chris Wright804a6a492005-05-11 10:52:45 +0100231 depends on NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 help
233 Enable auditing infrastructure that can be used with another
234 kernel subsystem, such as SELinux (which requires this for
235 logging of avc messages output). Does not do system-call
236 auditing without CONFIG_AUDITSYSCALL.
237
238config AUDITSYSCALL
239 bool "Enable system-call auditing support"
Yuichi Nakamura1322b9d2007-11-10 19:21:34 +0900240 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 default y if SECURITY_SELINUX
242 help
243 Enable low-overhead system-call auditing infrastructure that
244 can be used independently or with another kernel subsystem,
Amy Griffisf368c07d2006-04-07 16:55:56 -0400245 such as SELinux. To use audit's filesystem watch feature, please
246 ensure that INOTIFY is configured.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Al Viro74c3cbe2007-07-22 08:04:18 -0400248config AUDIT_TREE
249 def_bool y
250 depends on AUDITSYSCALL && INOTIFY
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252config IKCONFIG
Ross Birof2443ab2006-09-30 23:27:25 -0700253 tristate "Kernel .config support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 ---help---
255 This option enables the complete Linux kernel ".config" file
256 contents to be saved in the kernel. It provides documentation
257 of which kernel options are used in a running kernel or in an
258 on-disk kernel. This information can be extracted from the kernel
259 image file with the script scripts/extract-ikconfig and used as
260 input to rebuild the current kernel or to build another kernel.
261 It can also be extracted from a running kernel by reading
262 /proc/config.gz if enabled (below).
263
264config IKCONFIG_PROC
265 bool "Enable access to .config through /proc/config.gz"
266 depends on IKCONFIG && PROC_FS
267 ---help---
268 This option enables access to the kernel configuration file
269 through /proc/config.gz.
270
Alistair John Strachan794543a2007-05-08 00:31:15 -0700271config LOG_BUF_SHIFT
272 int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
273 range 12 21
274 default 17 if S390 || LOCKDEP
275 default 16 if X86_NUMAQ || IA64
276 default 15 if SMP
277 default 14
278 help
279 Select kernel log buffer size as a power of 2.
280 Defaults and Examples:
281 17 => 128 KB for S/390
282 16 => 64 KB for x86 NUMAQ or IA-64
283 15 => 32 KB for SMP
284 14 => 16 KB for uniprocessor
285 13 => 8 KB
286 12 => 4 KB
287
Paul Menageddbcc7e2007-10-18 23:39:30 -0700288config CGROUPS
289 bool "Control Group support"
290 help
291 This option will let you use process cgroup subsystems
292 such as Cpusets
293
294 Say N if unsure.
295
Paul Menage006cb992007-10-18 23:39:43 -0700296config CGROUP_DEBUG
297 bool "Example debug cgroup subsystem"
298 depends on CGROUPS
299 help
300 This option enables a simple cgroup subsystem that
301 exports useful debugging information about the cgroups
302 framework
303
304 Say N if unsure
305
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700306config CGROUP_NS
307 bool "Namespace cgroup subsystem"
308 depends on CGROUPS
309 help
310 Provides a simple namespace cgroup subsystem to
311 provide hierarchical naming of sets of namespaces,
312 for instance virtual servers and checkpoint/restart
313 jobs.
314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315config CPUSETS
316 bool "Cpuset support"
Paul Menage8793d852007-10-18 23:39:39 -0700317 depends on SMP && CGROUPS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700319 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 allow dynamically partitioning a system into sets of CPUs and
321 Memory Nodes and assigning tasks to run only within those sets.
322 This is primarily useful on large SMP or NUMA systems.
323
324 Say N if unsure.
325
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200326config FAIR_GROUP_SCHED
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200327 bool "Fair group CPU scheduler"
Ingo Molnarde8d5852007-10-15 17:00:09 +0200328 default y
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200329 help
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200330 This feature lets CPU scheduler recognize task groups and control CPU
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +0200331 bandwidth allocation to such task groups.
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200332
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200333choice
334 depends on FAIR_GROUP_SCHED
335 prompt "Basis for grouping tasks"
336 default FAIR_USER_SCHED
337
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200338config FAIR_USER_SCHED
339 bool "user id"
340 help
341 This option will choose userid as the basis for grouping
342 tasks, thus providing equal CPU bandwidth to each user.
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200343
Srivatsa Vaddagiri68318b82007-10-18 23:41:03 -0700344config FAIR_CGROUP_SCHED
345 bool "Control groups"
346 depends on CGROUPS
347 help
348 This option allows you to create arbitrary task groups
349 using the "cgroup" pseudo filesystem and control
350 the cpu bandwidth allocated to each such task group.
351 Refer to Documentation/cgroups.txt for more information
352 on "cgroup" pseudo filesystem.
353
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200354endchoice
355
Srivatsa Vaddagirid842de82007-12-02 20:04:49 +0100356config CGROUP_CPUACCT
357 bool "Simple CPU accounting cgroup subsystem"
358 depends on CGROUPS
359 help
360 Provides a simple Resource Controller for monitoring the
361 total CPU consumed by the tasks in a cgroup
362
Pavel Emelianove552b662008-02-07 00:13:49 -0800363config RESOURCE_COUNTERS
364 bool "Resource counters"
365 help
366 This option enables controller independent resource accounting
367 infrastructure that works with cgroups
368 depends on CGROUPS
369
Kay Sievers88a22c92006-09-14 11:23:28 +0200370config SYSFS_DEPRECATED
371 bool "Create deprecated sysfs files"
Randy Dunlap9148fe82007-12-31 10:05:34 -0800372 depends on SYSFS
Kay Sievers88a22c92006-09-14 11:23:28 +0200373 default y
374 help
375 This option creates deprecated symlinks such as the
376 "device"-link, the <subsystem>:<name>-link, and the
377 "bus"-link. It may also add deprecated key in the
378 uevent environment.
379 None of these features or values should be used today, as
380 they export driver core implementation details to userspace
381 or export properties which can't be kept stable across kernel
382 releases.
383
384 If enabled, this option will also move any device structures
David Sterba3dde6ad2007-05-09 07:12:20 +0200385 that belong to a class, back into the /sys/class hierarchy, in
Kay Sievers88a22c92006-09-14 11:23:28 +0200386 order to support older versions of udev.
387
388 If you are using a distro that was released in 2006 or later,
389 it should be safe to say N here.
390
Balbir Singh8cdea7c2008-02-07 00:13:50 -0800391config CGROUP_MEM_CONT
392 bool "Memory controller for cgroups"
393 depends on CGROUPS && RESOURCE_COUNTERS
394 help
395 Provides a memory controller that manages both page cache and
396 RSS memory.
397
Paul Menage8793d852007-10-18 23:39:39 -0700398config PROC_PID_CPUSET
399 bool "Include legacy /proc/<pid>/cpuset file"
400 depends on CPUSETS
401 default y
402
Jens Axboeb86ff9812006-03-23 19:56:55 +0100403config RELAY
404 bool "Kernel->user space relay support (formerly relayfs)"
405 help
406 This option enables support for relay interface support in
407 certain file systems (such as debugfs).
408 It is designed to provide an efficient mechanism for tools and
409 facilities to relay large amounts of data from kernel space to
410 user space.
411
412 If unsure, say N.
413
Pavel Emelyanovc5289a62008-02-08 04:18:19 -0800414config NAMESPACES
415 bool "Namespaces support" if EMBEDDED
416 default !EMBEDDED
417 help
418 Provides the way to make tasks work with different objects using
419 the same id. For example same IPC id may refer to different objects
420 or same user id or pid may refer to different tasks when used in
421 different namespaces.
422
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -0800423config UTS_NS
424 bool "UTS namespace"
425 depends on NAMESPACES
426 help
427 In this namespace tasks see different info provided with the
428 uname() system call
429
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -0800430config IPC_NS
431 bool "IPC namespace"
432 depends on NAMESPACES && SYSVIPC
433 help
434 In this namespace tasks work with IPC ids which correspond to
435 different IPC objects in different namespaces
436
Pavel Emelyanovaee16ce2008-02-08 04:18:23 -0800437config USER_NS
438 bool "User namespace (EXPERIMENTAL)"
439 depends on NAMESPACES && EXPERIMENTAL
440 help
441 This allows containers, i.e. vservers, to use user namespaces
442 to provide different user info for different servers.
443 If unsure, say N.
444
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800445config BLK_DEV_INITRD
446 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
447 depends on BROKEN || !FRV
448 help
449 The initial RAM filesystem is a ramfs which is loaded by the
450 boot loader (loadlin or lilo) and that is mounted as root
451 before the normal boot procedure. It is typically used to
452 load modules needed to mount the "real" root file system,
453 etc. See <file:Documentation/initrd.txt> for details.
454
455 If RAM disk support (BLK_DEV_RAM) is also included, this
456 also enables initial RAM disk (initrd) support and adds
457 15 Kbytes (more on some other architectures) to the kernel size.
458
459 If unsure say Y.
460
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800461if BLK_DEV_INITRD
462
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200463source "usr/Kconfig"
464
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800465endif
466
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800467config CC_OPTIMIZE_FOR_SIZE
468 bool "Optimize for size (Look out for broken compilers!)"
469 default y
Paul Mundt32582fa2007-07-25 11:27:05 +0900470 depends on ARM || H8300 || SUPERH || EXPERIMENTAL
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800471 help
472 Enabling this option will pass "-Os" instead of "-O2" to gcc
473 resulting in a smaller kernel.
474
475 WARNING: some versions of gcc may generate incorrect code with this
476 option. If problems are observed, a gcc upgrade may be needed.
477
478 If unsure, say N.
479
Randy Dunlap08470622006-09-30 23:28:13 -0700480config SYSCTL
481 bool
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483menuconfig EMBEDDED
484 bool "Configure standard kernel features (for small systems)"
485 help
486 This option allows certain base kernel options and settings
487 to be disabled or tweaked. This is for specialized
488 environments which can tolerate a "non-standard" kernel.
489 Only use this if you really know what you are doing.
490
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700491config UID16
492 bool "Enable 16-bit UID system calls" if EMBEDDED
Mike Frysinger529a73f2007-11-23 14:28:44 +0800493 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 -0700494 default y
495 help
496 This enables the legacy 16-bit UID syscall wrappers.
497
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700498config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700499 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800500 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700501 select SYSCTL
502 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800503 sys_sysctl uses binary paths that have been found challenging
504 to properly maintain and use. The interface in /proc/sys
505 using paths with ascii names is now the primary path to this
506 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700507
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800508 Almost nothing using the binary sysctl interface so if you are
509 trying to save some space it is probably safe to disable this,
510 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700511
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800512 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700513
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100515 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 default y
517 help
518 Say Y here to let the kernel print out symbolic crash information and
519 symbolic stack backtraces. This increases the size of the kernel
520 somewhat, as all symbols have to be loaded into the kernel image.
521
522config KALLSYMS_ALL
523 bool "Include all symbols in kallsyms"
524 depends on DEBUG_KERNEL && KALLSYMS
525 help
526 Normally kallsyms only contains the symbols of functions, for nicer
527 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200528 symbols too: say Y here to include all symbols, if you need them
529 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 Say N.
532
533config KALLSYMS_EXTRA_PASS
534 bool "Do an extra kallsyms pass"
535 depends on KALLSYMS
536 help
537 If kallsyms is not working correctly, the build will fail with
538 inconsistent kallsyms data. If that occurs, log a bug report and
539 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
540 Always say N here unless you find a bug in kallsyms, which must be
541 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
542 you wait for kallsyms to be fixed.
543
Matt Mackalld59745c2005-05-01 08:59:02 -0700544
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800545config HOTPLUG
546 bool "Support for hot-pluggable devices" if EMBEDDED
547 default y
548 help
549 This option is provided for the case where no hotplug or uevent
550 capabilities is wanted by the kernel. You should only consider
551 disabling this option for embedded systems that do not use modules, a
552 dynamic /dev tree, or dynamic device discovery. Just say Y.
553
Matt Mackalld59745c2005-05-01 08:59:02 -0700554config PRINTK
555 default y
556 bool "Enable support for printk" if EMBEDDED
557 help
558 This option enables normal printk support. Removing it
559 eliminates most of the message strings from the kernel image
560 and makes the kernel more or less silent. As this makes it
561 very difficult to diagnose system problems, saying N here is
562 strongly discouraged.
563
Matt Mackallc8538a72005-05-01 08:59:01 -0700564config BUG
565 bool "BUG() support" if EMBEDDED
566 default y
567 help
568 Disabling this option eliminates support for BUG and WARN, reducing
569 the size of your kernel image and potentially quietly ignoring
570 numerous fatal conditions. You should only consider disabling this
571 option for embedded systems with no facilities for reporting errors.
572 Just say Y.
573
Matt Mackall708e9a72006-01-08 01:05:25 -0800574config ELF_CORE
575 default y
576 bool "Enable ELF core dumps" if EMBEDDED
577 help
578 Enable support for generating core dumps. Disabling saves about 4k.
579
Ingo Molnar32a93232008-02-06 22:39:44 +0100580config COMPAT_BRK
581 bool "Disable heap randomization"
582 default y
583 help
584 Randomizing heap placement makes heap exploits harder, but it
585 also breaks ancient binaries (including anything libc5 based).
586 This option changes the bootup default to heap randomization
587 disabled, and can be overriden runtime by setting
588 /proc/sys/kernel/randomize_va_space to 2.
589
590 On non-ancient distros (post-2000 ones) Y is usually a safe choice.
591
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592config BASE_FULL
593 default y
594 bool "Enable full-sized data structures for core" if EMBEDDED
595 help
596 Disabling this option reduces the size of miscellaneous core
597 kernel data structures. This saves memory on small machines,
598 but may reduce performance.
599
600config FUTEX
601 bool "Enable futex support" if EMBEDDED
602 default y
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700603 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 help
605 Disabling this option will cause the kernel to be built without
606 support for "fast userspace mutexes". The resulting kernel may not
607 run glibc-based applications correctly.
608
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700609config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700610 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700611
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612config EPOLL
613 bool "Enable eventpoll support" if EMBEDDED
614 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700615 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 help
617 Disabling this option will cause the kernel to be built without
618 support for epoll family of system calls.
619
Davide Libenzifba2afa2007-05-10 22:23:13 -0700620config SIGNALFD
621 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700622 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700623 default y
624 help
625 Enable the signalfd() system call that allows to receive signals
626 on a file descriptor.
627
628 If unsure, say Y.
629
Davide Libenzib215e282007-05-10 22:23:16 -0700630config TIMERFD
631 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700632 select ANON_INODES
Davide Libenzib215e282007-05-10 22:23:16 -0700633 default y
634 help
635 Enable the timerfd() system call that allows to receive timer
636 events on a file descriptor.
637
638 If unsure, say Y.
639
Davide Libenzie1ad7462007-05-10 22:23:19 -0700640config EVENTFD
641 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700642 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700643 default y
644 help
645 Enable the eventfd() system call that allows to receive both
646 kernel notification (ie. KAIO) or userspace notifications.
647
648 If unsure, say Y.
649
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650config SHMEM
651 bool "Use full shmem filesystem" if EMBEDDED
652 default y
653 depends on MMU
654 help
655 The shmem is an internal filesystem used to manage shared memory.
656 It is backed by swap and manages resource limits. It is also exported
657 to userspace as tmpfs if TMPFS is enabled. Disabling this
658 option replaces shmem and tmpfs with the much simpler ramfs code,
659 which may be appropriate on small systems without swap.
660
Christoph Lameterf8891e52006-06-30 01:55:45 -0700661config VM_EVENT_COUNTERS
662 default y
663 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
664 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800665 VM event counters are needed for event counts to be shown.
666 This option allows the disabling of the VM event counters
667 on EMBEDDED systems. /proc/vmstat will only show page counts
668 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700669
Christoph Lameter41ecc552007-05-09 02:32:44 -0700670config SLUB_DEBUG
671 default y
672 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterd4751a22007-05-10 03:15:40 -0700673 depends on SLUB
Christoph Lameter41ecc552007-05-09 02:32:44 -0700674 help
675 SLUB has extensive debug support features. Disabling these can
676 result in significant savings in code size. This also disables
677 SLUB sysfs support. /sys/slab will not exist and there will be
678 no support for cache validation etc.
679
Christoph Lameter81819f02007-05-06 14:49:36 -0700680choice
681 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700682 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700683 help
684 This option allows to select a slab allocator.
685
686config SLAB
687 bool "SLAB"
688 help
689 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700690 well in all environments. It organizes cache hot objects in
Christoph Lameter81819f02007-05-06 14:49:36 -0700691 per cpu and per node queues. SLAB is the default choice for
Christoph Lameter34013882007-05-09 02:32:47 -0700692 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700693
694config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700695 bool "SLUB (Unqueued Allocator)"
696 help
697 SLUB is a slab allocator that minimizes cache line usage
698 instead of managing queues of cached objects (SLAB approach).
699 Per cpu caching is realized using slabs of objects instead
700 of queues of objects. SLUB can use memory efficiently
Christoph Lameter34013882007-05-09 02:32:47 -0700701 and has enhanced diagnostics.
Christoph Lameter81819f02007-05-06 14:49:36 -0700702
703config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700704 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700705 bool "SLOB (Simple Allocator)"
706 help
Matt Mackall37291452008-02-04 22:29:38 -0800707 SLOB replaces the stock allocator with a drastically simpler
708 allocator. SLOB is generally more space efficient but
709 does not perform as well on large systems.
Christoph Lameter81819f02007-05-06 14:49:36 -0700710
711endchoice
712
Mathieu Desnoyers125e5642008-02-02 15:10:36 -0500713config PROFILING
714 bool "Profiling support (EXPERIMENTAL)"
715 help
716 Say Y here to enable the extended profiling support mechanisms used
717 by profilers such as OProfile.
718
719config MARKERS
720 bool "Activate markers"
721 help
722 Place an empty function call at each marker site. Can be
723 dynamically changed for a probe function.
724
Mathieu Desnoyersfb32e032008-02-02 15:10:33 -0500725source "arch/Kconfig"
726
Matt Mackall1e883282008-02-04 22:29:07 -0800727config PROC_PAGE_MONITOR
728 default y
729 depends on PROC_FS && MMU
730 bool "Enable /proc page monitoring" if EMBEDDED
731 help
732 Various /proc files exist to monitor process memory utilization:
733 /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
734 /proc/kpagecount, and /proc/kpageflags. Disabling these
735 interfaces will reduce the size of the kernel by approximately 4kb.
736
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737endmenu # General setup
738
Linus Torvalds158a9622008-01-02 13:04:48 -0800739config SLABINFO
740 bool
741 depends on PROC_FS
742 depends on SLAB || SLUB
743 default y
744
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700745config RT_MUTEXES
746 boolean
747 select PLIST
748
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749config TINY_SHMEM
750 default !SHMEM
751 bool
752
753config BASE_SMALL
754 int
755 default 0 if BASE_FULL
756 default 1 if !BASE_FULL
757
Jan Engelhardt66da5732007-07-15 23:39:29 -0700758menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 bool "Enable loadable module support"
760 help
761 Kernel modules are small pieces of compiled code which can
762 be inserted in the running kernel, rather than being
763 permanently built into the kernel. You use the "modprobe"
764 tool to add (and sometimes remove) them. If you say Y here,
765 many parts of the kernel can be built as modules (by
766 answering M instead of Y where indicated): this is most
767 useful for infrequently used options which are not required
768 for booting. For more information, see the man pages for
769 modprobe, lsmod, modinfo, insmod and rmmod.
770
771 If you say Y here, you will need to run "make
772 modules_install" to put the modules under /lib/modules/
773 where modprobe can find them (you may need to be root to do
774 this).
775
776 If unsure, say Y.
777
778config MODULE_UNLOAD
779 bool "Module unloading"
780 depends on MODULES
781 help
782 Without this option you will not be able to unload any
783 modules (note that some modules may not be unloadable
784 anyway), which makes your kernel slightly smaller and
785 simpler. If unsure, say Y.
786
787config MODULE_FORCE_UNLOAD
788 bool "Forced module unloading"
789 depends on MODULE_UNLOAD && EXPERIMENTAL
790 help
791 This option allows you to force a module to unload, even if the
792 kernel believes it is unsafe: the kernel will remove the module
793 without waiting for anyone to stop using it (using the -f option to
794 rmmod). This is mainly for kernel developers and desperate users.
795 If unsure, say N.
796
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100798 bool "Module versioning support"
799 depends on MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 help
801 Usually, you have to use modules compiled with your kernel.
802 Saying Y here makes it sometimes possible to use modules
803 compiled for different kernels, by adding enough information
804 to the modules to (hopefully) spot any changes which would
805 make them incompatible with the kernel you are running. If
806 unsure, say N.
807
808config MODULE_SRCVERSION_ALL
809 bool "Source checksum for all modules"
810 depends on MODULES
811 help
812 Modules which contain a MODULE_VERSION get an extra "srcversion"
813 field inserted into their modinfo section, which contains a
814 sum of the source files which made it. This helps maintainers
815 see exactly which source was used to build a module (since
816 others sometimes change the module source without updating
817 the version). With this option, such a "srcversion" field
818 will be created for all modules. If unsure, say N.
819
820config KMOD
821 bool "Automatic kernel module loading"
822 depends on MODULES
823 help
824 Normally when you have selected some parts of the kernel to
825 be created as kernel modules, you must load them (using the
826 "modprobe" command) before you can use them. If you say Y
827 here, some parts of the kernel will be able to load modules
828 automatically: when a part of the kernel needs a module, it
829 runs modprobe with the appropriate arguments, thereby
830 loading the module if it is available. If unsure, say Y.
831
832config STOP_MACHINE
833 bool
834 default y
835 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
836 help
837 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100838
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100839source "block/Kconfig"
Avi Kivitye98c3202007-10-16 23:27:31 -0700840
841config PREEMPT_NOTIFIERS
842 bool
Paul E. McKenneye260be62008-01-25 21:08:24 +0100843
844choice
845 prompt "RCU implementation type:"
846 default CLASSIC_RCU
Paul E. McKenney09503102008-01-31 22:45:22 +0100847 help
848 This allows you to choose either the classic RCU implementation
849 that is designed for best read-side performance on non-realtime
850 systems, or the preemptible RCU implementation for best latency
851 on realtime systems. Note that some kernel preemption modes
852 will restrict your choice.
853
854 Select the default if you are unsure.
Paul E. McKenneye260be62008-01-25 21:08:24 +0100855
856config CLASSIC_RCU
857 bool "Classic RCU"
858 help
859 This option selects the classic RCU implementation that is
860 designed for best read-side performance on non-realtime
861 systems.
862
863 Say Y if you are unsure.
864
865config PREEMPT_RCU
866 bool "Preemptible RCU"
867 depends on PREEMPT
868 help
869 This option reduces the latency of the kernel by making certain
870 RCU sections preemptible. Normally RCU code is non-preemptible, if
871 this option is selected then read-only RCU sections become
872 preemptible. This helps latency, but may expose bugs due to
873 now-naive assumptions about each RCU read-side critical section
874 remaining on a given CPU through its execution.
875
876 Say N if you are unsure.
877
878endchoice