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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' Giarrussob2670ea2006-10-19 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41 drivers that have been replaced by something else, and/or are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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217config AUDIT
218 bool "Auditing support"
Chris Wright804a6a42005-05-11 10:52:45 +0100219 depends on NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 help
221 Enable auditing infrastructure that can be used with another
222 kernel subsystem, such as SELinux (which requires this for
223 logging of avc messages output). Does not do system-call
224 auditing without CONFIG_AUDITSYSCALL.
225
226config AUDITSYSCALL
227 bool "Enable system-call auditing support"
Yuichi Nakamura1322b9d2007-11-10 19:21:34 +0900228 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 default y if SECURITY_SELINUX
230 help
231 Enable low-overhead system-call auditing infrastructure that
232 can be used independently or with another kernel subsystem,
Amy Griffisf368c07d2006-04-07 16:55:56 -0400233 such as SELinux. To use audit's filesystem watch feature, please
234 ensure that INOTIFY is configured.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Al Viro74c3cbe2007-07-22 08:04:18 -0400236config AUDIT_TREE
237 def_bool y
238 depends on AUDITSYSCALL && INOTIFY
239
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240config IKCONFIG
Ross Birof2443ab2006-09-30 23:27:25 -0700241 tristate "Kernel .config support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 ---help---
243 This option enables the complete Linux kernel ".config" file
244 contents to be saved in the kernel. It provides documentation
245 of which kernel options are used in a running kernel or in an
246 on-disk kernel. This information can be extracted from the kernel
247 image file with the script scripts/extract-ikconfig and used as
248 input to rebuild the current kernel or to build another kernel.
249 It can also be extracted from a running kernel by reading
250 /proc/config.gz if enabled (below).
251
252config IKCONFIG_PROC
253 bool "Enable access to .config through /proc/config.gz"
254 depends on IKCONFIG && PROC_FS
255 ---help---
256 This option enables access to the kernel configuration file
257 through /proc/config.gz.
258
Alistair John Strachan794543a2007-05-08 00:31:15 -0700259config LOG_BUF_SHIFT
260 int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
261 range 12 21
262 default 17 if S390 || LOCKDEP
263 default 16 if X86_NUMAQ || IA64
264 default 15 if SMP
265 default 14
266 help
267 Select kernel log buffer size as a power of 2.
268 Defaults and Examples:
269 17 => 128 KB for S/390
270 16 => 64 KB for x86 NUMAQ or IA-64
271 15 => 32 KB for SMP
272 14 => 16 KB for uniprocessor
273 13 => 8 KB
274 12 => 4 KB
275
Paul Menageddbcc7e2007-10-18 23:39:30 -0700276config CGROUPS
277 bool "Control Group support"
278 help
279 This option will let you use process cgroup subsystems
280 such as Cpusets
281
282 Say N if unsure.
283
Paul Menage006cb992007-10-18 23:39:43 -0700284config CGROUP_DEBUG
285 bool "Example debug cgroup subsystem"
286 depends on CGROUPS
287 help
288 This option enables a simple cgroup subsystem that
289 exports useful debugging information about the cgroups
290 framework
291
292 Say N if unsure
293
Serge E. Hallyn858d72e2007-10-18 23:39:45 -0700294config CGROUP_NS
295 bool "Namespace cgroup subsystem"
296 depends on CGROUPS
297 help
298 Provides a simple namespace cgroup subsystem to
299 provide hierarchical naming of sets of namespaces,
300 for instance virtual servers and checkpoint/restart
301 jobs.
302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303config CPUSETS
304 bool "Cpuset support"
Paul Menage8793d852007-10-18 23:39:39 -0700305 depends on SMP && CGROUPS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700307 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 allow dynamically partitioning a system into sets of CPUs and
309 Memory Nodes and assigning tasks to run only within those sets.
310 This is primarily useful on large SMP or NUMA systems.
311
312 Say N if unsure.
313
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100314config GROUP_SCHED
315 bool "Group CPU scheduler"
Ingo Molnarde8d5852007-10-15 17:00:09 +0200316 default y
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200317 help
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200318 This feature lets CPU scheduler recognize task groups and control CPU
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +0200319 bandwidth allocation to such task groups.
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200320
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100321config FAIR_GROUP_SCHED
322 bool "Group scheduling for SCHED_OTHER"
323 depends on GROUP_SCHED
324 default y
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200325
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100326config RT_GROUP_SCHED
327 bool "Group scheduling for SCHED_RR/FIFO"
328 depends on EXPERIMENTAL
329 depends on GROUP_SCHED
330 default n
331
332choice
333 depends on GROUP_SCHED
334 prompt "Basis for grouping tasks"
335 default USER_SCHED
336
337config USER_SCHED
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200338 bool "user id"
339 help
340 This option will choose userid as the basis for grouping
341 tasks, thus providing equal CPU bandwidth to each user.
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200342
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100343config CGROUP_SCHED
Srivatsa Vaddagiri68318b82007-10-18 23:41:03 -0700344 bool "Control groups"
345 depends on CGROUPS
346 help
347 This option allows you to create arbitrary task groups
348 using the "cgroup" pseudo filesystem and control
349 the cpu bandwidth allocated to each such task group.
350 Refer to Documentation/cgroups.txt for more information
351 on "cgroup" pseudo filesystem.
352
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200353endchoice
354
Srivatsa Vaddagirid842de82007-12-02 20:04:49 +0100355config CGROUP_CPUACCT
356 bool "Simple CPU accounting cgroup subsystem"
357 depends on CGROUPS
358 help
359 Provides a simple Resource Controller for monitoring the
360 total CPU consumed by the tasks in a cgroup
361
Pavel Emelianove552b662008-02-07 00:13:49 -0800362config RESOURCE_COUNTERS
363 bool "Resource counters"
364 help
365 This option enables controller independent resource accounting
366 infrastructure that works with cgroups
367 depends on CGROUPS
368
Balbir Singh00f0b822008-03-04 14:28:39 -0800369config CGROUP_MEM_RES_CTLR
370 bool "Memory Resource Controller for Control Groups"
371 depends on CGROUPS && RESOURCE_COUNTERS
372 help
373 Provides a memory resource controller that manages both page cache and
374 RSS memory.
375
376 Note that setting this option increases fixed memory overhead
377 associated with each page of memory in the system by 4/8 bytes
378 and also increases cache misses because struct page on many 64bit
379 systems will not fit into a single cache line anymore.
380
381 Only enable when you're ok with these trade offs and really
382 sure you need the memory resource controller.
383
Kay Sievers88a22c92006-09-14 11:23:28 +0200384config SYSFS_DEPRECATED
Ingo Molnard47846c2008-03-04 14:54:47 +0100385 bool
386
387config SYSFS_DEPRECATED_V2
Kay Sievers88a22c92006-09-14 11:23:28 +0200388 bool "Create deprecated sysfs files"
Randy Dunlap9148fe82007-12-31 10:05:34 -0800389 depends on SYSFS
Kay Sievers88a22c92006-09-14 11:23:28 +0200390 default y
Ingo Molnard47846c2008-03-04 14:54:47 +0100391 select SYSFS_DEPRECATED
Kay Sievers88a22c92006-09-14 11:23:28 +0200392 help
393 This option creates deprecated symlinks such as the
394 "device"-link, the <subsystem>:<name>-link, and the
395 "bus"-link. It may also add deprecated key in the
396 uevent environment.
397 None of these features or values should be used today, as
398 they export driver core implementation details to userspace
399 or export properties which can't be kept stable across kernel
400 releases.
401
402 If enabled, this option will also move any device structures
David Sterba3dde6ad2007-05-09 07:12:20 +0200403 that belong to a class, back into the /sys/class hierarchy, in
Greg Kroah-Hartman024440d2008-03-03 14:47:13 -0800404 order to support older versions of udev and some userspace
405 programs.
Kay Sievers88a22c92006-09-14 11:23:28 +0200406
Greg Kroah-Hartman024440d2008-03-03 14:47:13 -0800407 If you are using a distro with the most recent userspace
408 packages, it should be safe to say N here.
Kay Sievers88a22c92006-09-14 11:23:28 +0200409
Paul Menage8793d852007-10-18 23:39:39 -0700410config PROC_PID_CPUSET
411 bool "Include legacy /proc/<pid>/cpuset file"
412 depends on CPUSETS
413 default y
414
Jens Axboeb86ff982006-03-23 19:56:55 +0100415config RELAY
416 bool "Kernel->user space relay support (formerly relayfs)"
417 help
418 This option enables support for relay interface support in
419 certain file systems (such as debugfs).
420 It is designed to provide an efficient mechanism for tools and
421 facilities to relay large amounts of data from kernel space to
422 user space.
423
424 If unsure, say N.
425
Pavel Emelyanovc5289a62008-02-08 04:18:19 -0800426config NAMESPACES
427 bool "Namespaces support" if EMBEDDED
428 default !EMBEDDED
429 help
430 Provides the way to make tasks work with different objects using
431 the same id. For example same IPC id may refer to different objects
432 or same user id or pid may refer to different tasks when used in
433 different namespaces.
434
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -0800435config UTS_NS
436 bool "UTS namespace"
437 depends on NAMESPACES
438 help
439 In this namespace tasks see different info provided with the
440 uname() system call
441
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -0800442config IPC_NS
443 bool "IPC namespace"
444 depends on NAMESPACES && SYSVIPC
445 help
446 In this namespace tasks work with IPC ids which correspond to
447 different IPC objects in different namespaces
448
Pavel Emelyanovaee16ce2008-02-08 04:18:23 -0800449config USER_NS
450 bool "User namespace (EXPERIMENTAL)"
451 depends on NAMESPACES && EXPERIMENTAL
452 help
453 This allows containers, i.e. vservers, to use user namespaces
454 to provide different user info for different servers.
455 If unsure, say N.
456
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -0800457config PID_NS
458 bool "PID Namespaces (EXPERIMENTAL)"
459 default n
460 depends on NAMESPACES && EXPERIMENTAL
461 help
462 Suport process id namespaces. This allows having multiple
463 process with the same pid as long as they are in different
464 pid namespaces. This is a building block of containers.
465
466 Unless you want to work with an experimental feature
467 say N here.
468
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800469config BLK_DEV_INITRD
470 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
471 depends on BROKEN || !FRV
472 help
473 The initial RAM filesystem is a ramfs which is loaded by the
474 boot loader (loadlin or lilo) and that is mounted as root
475 before the normal boot procedure. It is typically used to
476 load modules needed to mount the "real" root file system,
477 etc. See <file:Documentation/initrd.txt> for details.
478
479 If RAM disk support (BLK_DEV_RAM) is also included, this
480 also enables initial RAM disk (initrd) support and adds
481 15 Kbytes (more on some other architectures) to the kernel size.
482
483 If unsure say Y.
484
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800485if BLK_DEV_INITRD
486
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200487source "usr/Kconfig"
488
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800489endif
490
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800491config CC_OPTIMIZE_FOR_SIZE
492 bool "Optimize for size (Look out for broken compilers!)"
493 default y
Paul Mundt32582fa2007-07-25 11:27:05 +0900494 depends on ARM || H8300 || SUPERH || EXPERIMENTAL
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800495 help
496 Enabling this option will pass "-Os" instead of "-O2" to gcc
497 resulting in a smaller kernel.
498
499 WARNING: some versions of gcc may generate incorrect code with this
500 option. If problems are observed, a gcc upgrade may be needed.
501
502 If unsure, say N.
503
Randy Dunlap08470622006-09-30 23:28:13 -0700504config SYSCTL
505 bool
506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507menuconfig EMBEDDED
508 bool "Configure standard kernel features (for small systems)"
509 help
510 This option allows certain base kernel options and settings
511 to be disabled or tweaked. This is for specialized
512 environments which can tolerate a "non-standard" kernel.
513 Only use this if you really know what you are doing.
514
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700515config UID16
516 bool "Enable 16-bit UID system calls" if EMBEDDED
Mike Frysinger529a73f2007-11-23 14:28:44 +0800517 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 -0700518 default y
519 help
520 This enables the legacy 16-bit UID syscall wrappers.
521
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700522config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700523 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800524 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700525 select SYSCTL
526 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800527 sys_sysctl uses binary paths that have been found challenging
528 to properly maintain and use. The interface in /proc/sys
529 using paths with ascii names is now the primary path to this
530 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700531
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800532 Almost nothing using the binary sysctl interface so if you are
533 trying to save some space it is probably safe to disable this,
534 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700535
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800536 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100539 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 default y
541 help
542 Say Y here to let the kernel print out symbolic crash information and
543 symbolic stack backtraces. This increases the size of the kernel
544 somewhat, as all symbols have to be loaded into the kernel image.
545
546config KALLSYMS_ALL
547 bool "Include all symbols in kallsyms"
548 depends on DEBUG_KERNEL && KALLSYMS
549 help
550 Normally kallsyms only contains the symbols of functions, for nicer
551 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200552 symbols too: say Y here to include all symbols, if you need them
553 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
555 Say N.
556
557config KALLSYMS_EXTRA_PASS
558 bool "Do an extra kallsyms pass"
559 depends on KALLSYMS
560 help
561 If kallsyms is not working correctly, the build will fail with
562 inconsistent kallsyms data. If that occurs, log a bug report and
563 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
564 Always say N here unless you find a bug in kallsyms, which must be
565 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
566 you wait for kallsyms to be fixed.
567
Matt Mackalld59745c2005-05-01 08:59:02 -0700568
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800569config HOTPLUG
570 bool "Support for hot-pluggable devices" if EMBEDDED
571 default y
572 help
573 This option is provided for the case where no hotplug or uevent
574 capabilities is wanted by the kernel. You should only consider
575 disabling this option for embedded systems that do not use modules, a
576 dynamic /dev tree, or dynamic device discovery. Just say Y.
577
Matt Mackalld59745c2005-05-01 08:59:02 -0700578config PRINTK
579 default y
580 bool "Enable support for printk" if EMBEDDED
581 help
582 This option enables normal printk support. Removing it
583 eliminates most of the message strings from the kernel image
584 and makes the kernel more or less silent. As this makes it
585 very difficult to diagnose system problems, saying N here is
586 strongly discouraged.
587
Matt Mackallc8538a72005-05-01 08:59:01 -0700588config BUG
589 bool "BUG() support" if EMBEDDED
590 default y
591 help
592 Disabling this option eliminates support for BUG and WARN, reducing
593 the size of your kernel image and potentially quietly ignoring
594 numerous fatal conditions. You should only consider disabling this
595 option for embedded systems with no facilities for reporting errors.
596 Just say Y.
597
Matt Mackall708e9a72006-01-08 01:05:25 -0800598config ELF_CORE
599 default y
600 bool "Enable ELF core dumps" if EMBEDDED
601 help
602 Enable support for generating core dumps. Disabling saves about 4k.
603
Ingo Molnar32a93232008-02-06 22:39:44 +0100604config COMPAT_BRK
605 bool "Disable heap randomization"
606 default y
607 help
608 Randomizing heap placement makes heap exploits harder, but it
609 also breaks ancient binaries (including anything libc5 based).
610 This option changes the bootup default to heap randomization
611 disabled, and can be overriden runtime by setting
612 /proc/sys/kernel/randomize_va_space to 2.
613
Ingo Molnar166124f2008-02-09 23:24:09 +0100614 On non-ancient distros (post-2000 ones) N is usually a safe choice.
Ingo Molnar32a93232008-02-06 22:39:44 +0100615
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616config BASE_FULL
617 default y
618 bool "Enable full-sized data structures for core" if EMBEDDED
619 help
620 Disabling this option reduces the size of miscellaneous core
621 kernel data structures. This saves memory on small machines,
622 but may reduce performance.
623
624config FUTEX
625 bool "Enable futex support" if EMBEDDED
626 default y
Ingo Molnar23f78d42006-06-27 02:54:53 -0700627 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 help
629 Disabling this option will cause the kernel to be built without
630 support for "fast userspace mutexes". The resulting kernel may not
631 run glibc-based applications correctly.
632
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700633config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700634 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700635
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636config EPOLL
637 bool "Enable eventpoll support" if EMBEDDED
638 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700639 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 help
641 Disabling this option will cause the kernel to be built without
642 support for epoll family of system calls.
643
Davide Libenzifba2afa2007-05-10 22:23:13 -0700644config SIGNALFD
645 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700646 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700647 default y
648 help
649 Enable the signalfd() system call that allows to receive signals
650 on a file descriptor.
651
652 If unsure, say Y.
653
Davide Libenzib215e282007-05-10 22:23:16 -0700654config TIMERFD
655 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700656 select ANON_INODES
Davide Libenzib215e282007-05-10 22:23:16 -0700657 default y
658 help
659 Enable the timerfd() system call that allows to receive timer
660 events on a file descriptor.
661
662 If unsure, say Y.
663
Davide Libenzie1ad7462007-05-10 22:23:19 -0700664config EVENTFD
665 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700666 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700667 default y
668 help
669 Enable the eventfd() system call that allows to receive both
670 kernel notification (ie. KAIO) or userspace notifications.
671
672 If unsure, say Y.
673
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674config SHMEM
675 bool "Use full shmem filesystem" if EMBEDDED
676 default y
677 depends on MMU
678 help
679 The shmem is an internal filesystem used to manage shared memory.
680 It is backed by swap and manages resource limits. It is also exported
681 to userspace as tmpfs if TMPFS is enabled. Disabling this
682 option replaces shmem and tmpfs with the much simpler ramfs code,
683 which may be appropriate on small systems without swap.
684
Christoph Lameterf8891e52006-06-30 01:55:45 -0700685config VM_EVENT_COUNTERS
686 default y
687 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
688 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800689 VM event counters are needed for event counts to be shown.
690 This option allows the disabling of the VM event counters
691 on EMBEDDED systems. /proc/vmstat will only show page counts
692 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700693
Christoph Lameter41ecc552007-05-09 02:32:44 -0700694config SLUB_DEBUG
695 default y
696 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterd4751a22007-05-10 03:15:40 -0700697 depends on SLUB
Christoph Lameter41ecc552007-05-09 02:32:44 -0700698 help
699 SLUB has extensive debug support features. Disabling these can
700 result in significant savings in code size. This also disables
701 SLUB sysfs support. /sys/slab will not exist and there will be
702 no support for cache validation etc.
703
Christoph Lameter81819f02007-05-06 14:49:36 -0700704choice
705 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700706 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700707 help
708 This option allows to select a slab allocator.
709
710config SLAB
711 bool "SLAB"
712 help
713 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700714 well in all environments. It organizes cache hot objects in
Christoph Lameter81819f02007-05-06 14:49:36 -0700715 per cpu and per node queues. SLAB is the default choice for
Christoph Lameter34013882007-05-09 02:32:47 -0700716 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700717
718config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700719 bool "SLUB (Unqueued Allocator)"
720 help
721 SLUB is a slab allocator that minimizes cache line usage
722 instead of managing queues of cached objects (SLAB approach).
723 Per cpu caching is realized using slabs of objects instead
724 of queues of objects. SLUB can use memory efficiently
Christoph Lameter34013882007-05-09 02:32:47 -0700725 and has enhanced diagnostics.
Christoph Lameter81819f02007-05-06 14:49:36 -0700726
727config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700728 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700729 bool "SLOB (Simple Allocator)"
730 help
Matt Mackall37291452008-02-04 22:29:38 -0800731 SLOB replaces the stock allocator with a drastically simpler
732 allocator. SLOB is generally more space efficient but
733 does not perform as well on large systems.
Christoph Lameter81819f02007-05-06 14:49:36 -0700734
735endchoice
736
Mathieu Desnoyers125e5642008-02-02 15:10:36 -0500737config PROFILING
738 bool "Profiling support (EXPERIMENTAL)"
739 help
740 Say Y here to enable the extended profiling support mechanisms used
741 by profilers such as OProfile.
742
743config MARKERS
744 bool "Activate markers"
745 help
746 Place an empty function call at each marker site. Can be
747 dynamically changed for a probe function.
748
Mathieu Desnoyersfb32e032008-02-02 15:10:33 -0500749source "arch/Kconfig"
750
Matt Mackall1e883282008-02-04 22:29:07 -0800751config PROC_PAGE_MONITOR
752 default y
753 depends on PROC_FS && MMU
754 bool "Enable /proc page monitoring" if EMBEDDED
755 help
756 Various /proc files exist to monitor process memory utilization:
757 /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
758 /proc/kpagecount, and /proc/kpageflags. Disabling these
759 interfaces will reduce the size of the kernel by approximately 4kb.
760
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761endmenu # General setup
762
Linus Torvalds158a9622008-01-02 13:04:48 -0800763config SLABINFO
764 bool
765 depends on PROC_FS
766 depends on SLAB || SLUB
767 default y
768
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700769config RT_MUTEXES
770 boolean
771 select PLIST
772
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773config TINY_SHMEM
774 default !SHMEM
775 bool
776
777config BASE_SMALL
778 int
779 default 0 if BASE_FULL
780 default 1 if !BASE_FULL
781
Jan Engelhardt66da5732007-07-15 23:39:29 -0700782menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 bool "Enable loadable module support"
784 help
785 Kernel modules are small pieces of compiled code which can
786 be inserted in the running kernel, rather than being
787 permanently built into the kernel. You use the "modprobe"
788 tool to add (and sometimes remove) them. If you say Y here,
789 many parts of the kernel can be built as modules (by
790 answering M instead of Y where indicated): this is most
791 useful for infrequently used options which are not required
792 for booting. For more information, see the man pages for
793 modprobe, lsmod, modinfo, insmod and rmmod.
794
795 If you say Y here, you will need to run "make
796 modules_install" to put the modules under /lib/modules/
797 where modprobe can find them (you may need to be root to do
798 this).
799
800 If unsure, say Y.
801
802config MODULE_UNLOAD
803 bool "Module unloading"
804 depends on MODULES
805 help
806 Without this option you will not be able to unload any
807 modules (note that some modules may not be unloadable
808 anyway), which makes your kernel slightly smaller and
809 simpler. If unsure, say Y.
810
811config MODULE_FORCE_UNLOAD
812 bool "Forced module unloading"
813 depends on MODULE_UNLOAD && EXPERIMENTAL
814 help
815 This option allows you to force a module to unload, even if the
816 kernel believes it is unsafe: the kernel will remove the module
817 without waiting for anyone to stop using it (using the -f option to
818 rmmod). This is mainly for kernel developers and desperate users.
819 If unsure, say N.
820
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100822 bool "Module versioning support"
823 depends on MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 help
825 Usually, you have to use modules compiled with your kernel.
826 Saying Y here makes it sometimes possible to use modules
827 compiled for different kernels, by adding enough information
828 to the modules to (hopefully) spot any changes which would
829 make them incompatible with the kernel you are running. If
830 unsure, say N.
831
832config MODULE_SRCVERSION_ALL
833 bool "Source checksum for all modules"
834 depends on MODULES
835 help
836 Modules which contain a MODULE_VERSION get an extra "srcversion"
837 field inserted into their modinfo section, which contains a
838 sum of the source files which made it. This helps maintainers
839 see exactly which source was used to build a module (since
840 others sometimes change the module source without updating
841 the version). With this option, such a "srcversion" field
842 will be created for all modules. If unsure, say N.
843
844config KMOD
845 bool "Automatic kernel module loading"
846 depends on MODULES
847 help
848 Normally when you have selected some parts of the kernel to
849 be created as kernel modules, you must load them (using the
850 "modprobe" command) before you can use them. If you say Y
851 here, some parts of the kernel will be able to load modules
852 automatically: when a part of the kernel needs a module, it
853 runs modprobe with the appropriate arguments, thereby
854 loading the module if it is available. If unsure, say Y.
855
856config STOP_MACHINE
857 bool
858 default y
859 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
860 help
861 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100862
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100863source "block/Kconfig"
Avi Kivitye98c3202007-10-16 23:27:31 -0700864
865config PREEMPT_NOTIFIERS
866 bool
Paul E. McKenneye260be62008-01-25 21:08:24 +0100867
Paul E. McKenneye260be62008-01-25 21:08:24 +0100868config CLASSIC_RCU
Paul E. McKenney21bbb392008-03-10 11:43:57 -0700869 def_bool !PREEMPT_RCU
Paul E. McKenneye260be62008-01-25 21:08:24 +0100870 help
871 This option selects the classic RCU implementation that is
872 designed for best read-side performance on non-realtime
Paul E. McKenney21bbb392008-03-10 11:43:57 -0700873 systems. Classic RCU is the default. Note that the
874 PREEMPT_RCU symbol is used to select/deselect this option.