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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41 drivers that have been replaced by something else, and/or are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
Viktor Radnaib9b158f2008-04-19 19:45:01 +0200331 help
332 This feature lets you explicitly allocate real CPU bandwidth
333 to users or control groups (depending on the "Basis for grouping tasks"
334 setting below. If enabled, it will also make it impossible to
335 schedule realtime tasks for non-root users until you allocate
336 realtime bandwidth for them.
337 See Documentation/sched-rt-group.txt for more information.
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100338
339choice
340 depends on GROUP_SCHED
341 prompt "Basis for grouping tasks"
342 default USER_SCHED
343
344config USER_SCHED
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200345 bool "user id"
346 help
347 This option will choose userid as the basis for grouping
348 tasks, thus providing equal CPU bandwidth to each user.
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200349
Peter Zijlstra052f1dc2008-02-13 15:45:40 +0100350config CGROUP_SCHED
Srivatsa Vaddagiri68318b82007-10-18 23:41:03 -0700351 bool "Control groups"
352 depends on CGROUPS
353 help
354 This option allows you to create arbitrary task groups
355 using the "cgroup" pseudo filesystem and control
356 the cpu bandwidth allocated to each such task group.
357 Refer to Documentation/cgroups.txt for more information
358 on "cgroup" pseudo filesystem.
359
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200360endchoice
361
Srivatsa Vaddagirid842de82007-12-02 20:04:49 +0100362config CGROUP_CPUACCT
363 bool "Simple CPU accounting cgroup subsystem"
364 depends on CGROUPS
365 help
366 Provides a simple Resource Controller for monitoring the
367 total CPU consumed by the tasks in a cgroup
368
Pavel Emelianove552b662008-02-07 00:13:49 -0800369config RESOURCE_COUNTERS
370 bool "Resource counters"
371 help
372 This option enables controller independent resource accounting
373 infrastructure that works with cgroups
374 depends on CGROUPS
375
Balbir Singh00f0b822008-03-04 14:28:39 -0800376config CGROUP_MEM_RES_CTLR
377 bool "Memory Resource Controller for Control Groups"
378 depends on CGROUPS && RESOURCE_COUNTERS
379 help
380 Provides a memory resource controller that manages both page cache and
381 RSS memory.
382
383 Note that setting this option increases fixed memory overhead
384 associated with each page of memory in the system by 4/8 bytes
385 and also increases cache misses because struct page on many 64bit
386 systems will not fit into a single cache line anymore.
387
388 Only enable when you're ok with these trade offs and really
389 sure you need the memory resource controller.
390
Kay Sievers88a22c92006-09-14 11:23:28 +0200391config SYSFS_DEPRECATED
Ingo Molnard47846c2008-03-04 14:54:47 +0100392 bool
393
394config SYSFS_DEPRECATED_V2
Kay Sievers88a22c92006-09-14 11:23:28 +0200395 bool "Create deprecated sysfs files"
Randy Dunlap9148fe82007-12-31 10:05:34 -0800396 depends on SYSFS
Kay Sievers88a22c92006-09-14 11:23:28 +0200397 default y
Ingo Molnard47846c2008-03-04 14:54:47 +0100398 select SYSFS_DEPRECATED
Kay Sievers88a22c92006-09-14 11:23:28 +0200399 help
400 This option creates deprecated symlinks such as the
401 "device"-link, the <subsystem>:<name>-link, and the
402 "bus"-link. It may also add deprecated key in the
403 uevent environment.
404 None of these features or values should be used today, as
405 they export driver core implementation details to userspace
406 or export properties which can't be kept stable across kernel
407 releases.
408
409 If enabled, this option will also move any device structures
David Sterba3dde6ad2007-05-09 07:12:20 +0200410 that belong to a class, back into the /sys/class hierarchy, in
Greg Kroah-Hartman024440d2008-03-03 14:47:13 -0800411 order to support older versions of udev and some userspace
412 programs.
Kay Sievers88a22c92006-09-14 11:23:28 +0200413
Greg Kroah-Hartman024440d2008-03-03 14:47:13 -0800414 If you are using a distro with the most recent userspace
415 packages, it should be safe to say N here.
Kay Sievers88a22c92006-09-14 11:23:28 +0200416
Paul Menage8793d852007-10-18 23:39:39 -0700417config PROC_PID_CPUSET
418 bool "Include legacy /proc/<pid>/cpuset file"
419 depends on CPUSETS
420 default y
421
Jens Axboeb86ff982006-03-23 19:56:55 +0100422config RELAY
423 bool "Kernel->user space relay support (formerly relayfs)"
424 help
425 This option enables support for relay interface support in
426 certain file systems (such as debugfs).
427 It is designed to provide an efficient mechanism for tools and
428 facilities to relay large amounts of data from kernel space to
429 user space.
430
431 If unsure, say N.
432
Pavel Emelyanovc5289a62008-02-08 04:18:19 -0800433config NAMESPACES
434 bool "Namespaces support" if EMBEDDED
435 default !EMBEDDED
436 help
437 Provides the way to make tasks work with different objects using
438 the same id. For example same IPC id may refer to different objects
439 or same user id or pid may refer to different tasks when used in
440 different namespaces.
441
Pavel Emelyanov58bfdd6d2008-02-08 04:18:21 -0800442config UTS_NS
443 bool "UTS namespace"
444 depends on NAMESPACES
445 help
446 In this namespace tasks see different info provided with the
447 uname() system call
448
Pavel Emelyanovae5e1b22008-02-08 04:18:22 -0800449config IPC_NS
450 bool "IPC namespace"
451 depends on NAMESPACES && SYSVIPC
452 help
453 In this namespace tasks work with IPC ids which correspond to
454 different IPC objects in different namespaces
455
Pavel Emelyanovaee16ce2008-02-08 04:18:23 -0800456config USER_NS
457 bool "User namespace (EXPERIMENTAL)"
458 depends on NAMESPACES && EXPERIMENTAL
459 help
460 This allows containers, i.e. vservers, to use user namespaces
461 to provide different user info for different servers.
462 If unsure, say N.
463
Pavel Emelyanov74bd59b2008-02-08 04:18:24 -0800464config PID_NS
465 bool "PID Namespaces (EXPERIMENTAL)"
466 default n
467 depends on NAMESPACES && EXPERIMENTAL
468 help
469 Suport process id namespaces. This allows having multiple
470 process with the same pid as long as they are in different
471 pid namespaces. This is a building block of containers.
472
473 Unless you want to work with an experimental feature
474 say N here.
475
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800476config BLK_DEV_INITRD
477 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
478 depends on BROKEN || !FRV
479 help
480 The initial RAM filesystem is a ramfs which is loaded by the
481 boot loader (loadlin or lilo) and that is mounted as root
482 before the normal boot procedure. It is typically used to
483 load modules needed to mount the "real" root file system,
484 etc. See <file:Documentation/initrd.txt> for details.
485
486 If RAM disk support (BLK_DEV_RAM) is also included, this
487 also enables initial RAM disk (initrd) support and adds
488 15 Kbytes (more on some other architectures) to the kernel size.
489
490 If unsure say Y.
491
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800492if BLK_DEV_INITRD
493
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200494source "usr/Kconfig"
495
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800496endif
497
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800498config CC_OPTIMIZE_FOR_SIZE
499 bool "Optimize for size (Look out for broken compilers!)"
500 default y
Paul Mundt32582fa2007-07-25 11:27:05 +0900501 depends on ARM || H8300 || SUPERH || EXPERIMENTAL
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800502 help
503 Enabling this option will pass "-Os" instead of "-O2" to gcc
504 resulting in a smaller kernel.
505
506 WARNING: some versions of gcc may generate incorrect code with this
507 option. If problems are observed, a gcc upgrade may be needed.
508
509 If unsure, say N.
510
Randy Dunlap08470622006-09-30 23:28:13 -0700511config SYSCTL
512 bool
513
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514menuconfig EMBEDDED
515 bool "Configure standard kernel features (for small systems)"
516 help
517 This option allows certain base kernel options and settings
518 to be disabled or tweaked. This is for specialized
519 environments which can tolerate a "non-standard" kernel.
520 Only use this if you really know what you are doing.
521
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700522config UID16
523 bool "Enable 16-bit UID system calls" if EMBEDDED
Mike Frysinger529a73f2007-11-23 14:28:44 +0800524 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 -0700525 default y
526 help
527 This enables the legacy 16-bit UID syscall wrappers.
528
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700529config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700530 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800531 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700532 select SYSCTL
533 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800534 sys_sysctl uses binary paths that have been found challenging
535 to properly maintain and use. The interface in /proc/sys
536 using paths with ascii names is now the primary path to this
537 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700538
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800539 Almost nothing using the binary sysctl interface so if you are
540 trying to save some space it is probably safe to disable this,
541 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700542
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800543 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700544
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100546 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 default y
548 help
549 Say Y here to let the kernel print out symbolic crash information and
550 symbolic stack backtraces. This increases the size of the kernel
551 somewhat, as all symbols have to be loaded into the kernel image.
552
553config KALLSYMS_ALL
554 bool "Include all symbols in kallsyms"
555 depends on DEBUG_KERNEL && KALLSYMS
556 help
557 Normally kallsyms only contains the symbols of functions, for nicer
558 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200559 symbols too: say Y here to include all symbols, if you need them
560 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
562 Say N.
563
564config KALLSYMS_EXTRA_PASS
565 bool "Do an extra kallsyms pass"
566 depends on KALLSYMS
567 help
568 If kallsyms is not working correctly, the build will fail with
569 inconsistent kallsyms data. If that occurs, log a bug report and
570 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
571 Always say N here unless you find a bug in kallsyms, which must be
572 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
573 you wait for kallsyms to be fixed.
574
Matt Mackalld59745c2005-05-01 08:59:02 -0700575
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800576config HOTPLUG
577 bool "Support for hot-pluggable devices" if EMBEDDED
578 default y
579 help
580 This option is provided for the case where no hotplug or uevent
581 capabilities is wanted by the kernel. You should only consider
582 disabling this option for embedded systems that do not use modules, a
583 dynamic /dev tree, or dynamic device discovery. Just say Y.
584
Matt Mackalld59745c2005-05-01 08:59:02 -0700585config PRINTK
586 default y
587 bool "Enable support for printk" if EMBEDDED
588 help
589 This option enables normal printk support. Removing it
590 eliminates most of the message strings from the kernel image
591 and makes the kernel more or less silent. As this makes it
592 very difficult to diagnose system problems, saying N here is
593 strongly discouraged.
594
Matt Mackallc8538a72005-05-01 08:59:01 -0700595config BUG
596 bool "BUG() support" if EMBEDDED
597 default y
598 help
599 Disabling this option eliminates support for BUG and WARN, reducing
600 the size of your kernel image and potentially quietly ignoring
601 numerous fatal conditions. You should only consider disabling this
602 option for embedded systems with no facilities for reporting errors.
603 Just say Y.
604
Matt Mackall708e9a72006-01-08 01:05:25 -0800605config ELF_CORE
606 default y
607 bool "Enable ELF core dumps" if EMBEDDED
608 help
609 Enable support for generating core dumps. Disabling saves about 4k.
610
Ingo Molnar32a93232008-02-06 22:39:44 +0100611config COMPAT_BRK
612 bool "Disable heap randomization"
613 default y
614 help
615 Randomizing heap placement makes heap exploits harder, but it
616 also breaks ancient binaries (including anything libc5 based).
617 This option changes the bootup default to heap randomization
618 disabled, and can be overriden runtime by setting
619 /proc/sys/kernel/randomize_va_space to 2.
620
Ingo Molnar166124f2008-02-09 23:24:09 +0100621 On non-ancient distros (post-2000 ones) N is usually a safe choice.
Ingo Molnar32a93232008-02-06 22:39:44 +0100622
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623config BASE_FULL
624 default y
625 bool "Enable full-sized data structures for core" if EMBEDDED
626 help
627 Disabling this option reduces the size of miscellaneous core
628 kernel data structures. This saves memory on small machines,
629 but may reduce performance.
630
631config FUTEX
632 bool "Enable futex support" if EMBEDDED
633 default y
Ingo Molnar23f78d42006-06-27 02:54:53 -0700634 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 help
636 Disabling this option will cause the kernel to be built without
637 support for "fast userspace mutexes". The resulting kernel may not
638 run glibc-based applications correctly.
639
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700640config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700641 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700642
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643config EPOLL
644 bool "Enable eventpoll support" if EMBEDDED
645 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700646 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 help
648 Disabling this option will cause the kernel to be built without
649 support for epoll family of system calls.
650
Davide Libenzifba2afa2007-05-10 22:23:13 -0700651config SIGNALFD
652 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700653 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700654 default y
655 help
656 Enable the signalfd() system call that allows to receive signals
657 on a file descriptor.
658
659 If unsure, say Y.
660
Davide Libenzib215e282007-05-10 22:23:16 -0700661config TIMERFD
662 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700663 select ANON_INODES
Davide Libenzib215e282007-05-10 22:23:16 -0700664 default y
665 help
666 Enable the timerfd() system call that allows to receive timer
667 events on a file descriptor.
668
669 If unsure, say Y.
670
Davide Libenzie1ad7462007-05-10 22:23:19 -0700671config EVENTFD
672 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700673 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700674 default y
675 help
676 Enable the eventfd() system call that allows to receive both
677 kernel notification (ie. KAIO) or userspace notifications.
678
679 If unsure, say Y.
680
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681config SHMEM
682 bool "Use full shmem filesystem" if EMBEDDED
683 default y
684 depends on MMU
685 help
686 The shmem is an internal filesystem used to manage shared memory.
687 It is backed by swap and manages resource limits. It is also exported
688 to userspace as tmpfs if TMPFS is enabled. Disabling this
689 option replaces shmem and tmpfs with the much simpler ramfs code,
690 which may be appropriate on small systems without swap.
691
Christoph Lameterf8891e52006-06-30 01:55:45 -0700692config VM_EVENT_COUNTERS
693 default y
694 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
695 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800696 VM event counters are needed for event counts to be shown.
697 This option allows the disabling of the VM event counters
698 on EMBEDDED systems. /proc/vmstat will only show page counts
699 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700700
Christoph Lameter41ecc552007-05-09 02:32:44 -0700701config SLUB_DEBUG
702 default y
703 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterd4751a22007-05-10 03:15:40 -0700704 depends on SLUB
Christoph Lameter41ecc552007-05-09 02:32:44 -0700705 help
706 SLUB has extensive debug support features. Disabling these can
707 result in significant savings in code size. This also disables
708 SLUB sysfs support. /sys/slab will not exist and there will be
709 no support for cache validation etc.
710
Christoph Lameter81819f02007-05-06 14:49:36 -0700711choice
712 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700713 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700714 help
715 This option allows to select a slab allocator.
716
717config SLAB
718 bool "SLAB"
719 help
720 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700721 well in all environments. It organizes cache hot objects in
Christoph Lameter81819f02007-05-06 14:49:36 -0700722 per cpu and per node queues. SLAB is the default choice for
Christoph Lameter34013882007-05-09 02:32:47 -0700723 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700724
725config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700726 bool "SLUB (Unqueued Allocator)"
727 help
728 SLUB is a slab allocator that minimizes cache line usage
729 instead of managing queues of cached objects (SLAB approach).
730 Per cpu caching is realized using slabs of objects instead
731 of queues of objects. SLUB can use memory efficiently
Christoph Lameter34013882007-05-09 02:32:47 -0700732 and has enhanced diagnostics.
Christoph Lameter81819f02007-05-06 14:49:36 -0700733
734config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700735 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700736 bool "SLOB (Simple Allocator)"
737 help
Matt Mackall37291452008-02-04 22:29:38 -0800738 SLOB replaces the stock allocator with a drastically simpler
739 allocator. SLOB is generally more space efficient but
740 does not perform as well on large systems.
Christoph Lameter81819f02007-05-06 14:49:36 -0700741
742endchoice
743
Mathieu Desnoyers125e5642008-02-02 15:10:36 -0500744config PROFILING
745 bool "Profiling support (EXPERIMENTAL)"
746 help
747 Say Y here to enable the extended profiling support mechanisms used
748 by profilers such as OProfile.
749
750config MARKERS
751 bool "Activate markers"
752 help
753 Place an empty function call at each marker site. Can be
754 dynamically changed for a probe function.
755
Mathieu Desnoyersfb32e032008-02-02 15:10:33 -0500756source "arch/Kconfig"
757
Matt Mackall1e883282008-02-04 22:29:07 -0800758config PROC_PAGE_MONITOR
759 default y
760 depends on PROC_FS && MMU
761 bool "Enable /proc page monitoring" if EMBEDDED
762 help
763 Various /proc files exist to monitor process memory utilization:
764 /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
765 /proc/kpagecount, and /proc/kpageflags. Disabling these
766 interfaces will reduce the size of the kernel by approximately 4kb.
767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768endmenu # General setup
769
Linus Torvalds158a9622008-01-02 13:04:48 -0800770config SLABINFO
771 bool
772 depends on PROC_FS
Christoph Lameter0f389ec2008-04-14 18:53:02 +0300773 depends on SLAB || SLUB_DEBUG
Linus Torvalds158a9622008-01-02 13:04:48 -0800774 default y
775
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700776config RT_MUTEXES
777 boolean
778 select PLIST
779
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780config TINY_SHMEM
781 default !SHMEM
782 bool
783
784config BASE_SMALL
785 int
786 default 0 if BASE_FULL
787 default 1 if !BASE_FULL
788
Jan Engelhardt66da5732007-07-15 23:39:29 -0700789menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 bool "Enable loadable module support"
791 help
792 Kernel modules are small pieces of compiled code which can
793 be inserted in the running kernel, rather than being
794 permanently built into the kernel. You use the "modprobe"
795 tool to add (and sometimes remove) them. If you say Y here,
796 many parts of the kernel can be built as modules (by
797 answering M instead of Y where indicated): this is most
798 useful for infrequently used options which are not required
799 for booting. For more information, see the man pages for
800 modprobe, lsmod, modinfo, insmod and rmmod.
801
802 If you say Y here, you will need to run "make
803 modules_install" to put the modules under /lib/modules/
804 where modprobe can find them (you may need to be root to do
805 this).
806
807 If unsure, say Y.
808
809config MODULE_UNLOAD
810 bool "Module unloading"
811 depends on MODULES
812 help
813 Without this option you will not be able to unload any
814 modules (note that some modules may not be unloadable
815 anyway), which makes your kernel slightly smaller and
816 simpler. If unsure, say Y.
817
818config MODULE_FORCE_UNLOAD
819 bool "Forced module unloading"
820 depends on MODULE_UNLOAD && EXPERIMENTAL
821 help
822 This option allows you to force a module to unload, even if the
823 kernel believes it is unsafe: the kernel will remove the module
824 without waiting for anyone to stop using it (using the -f option to
825 rmmod). This is mainly for kernel developers and desperate users.
826 If unsure, say N.
827
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100829 bool "Module versioning support"
830 depends on MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 help
832 Usually, you have to use modules compiled with your kernel.
833 Saying Y here makes it sometimes possible to use modules
834 compiled for different kernels, by adding enough information
835 to the modules to (hopefully) spot any changes which would
836 make them incompatible with the kernel you are running. If
837 unsure, say N.
838
839config MODULE_SRCVERSION_ALL
840 bool "Source checksum for all modules"
841 depends on MODULES
842 help
843 Modules which contain a MODULE_VERSION get an extra "srcversion"
844 field inserted into their modinfo section, which contains a
845 sum of the source files which made it. This helps maintainers
846 see exactly which source was used to build a module (since
847 others sometimes change the module source without updating
848 the version). With this option, such a "srcversion" field
849 will be created for all modules. If unsure, say N.
850
851config KMOD
852 bool "Automatic kernel module loading"
853 depends on MODULES
854 help
855 Normally when you have selected some parts of the kernel to
856 be created as kernel modules, you must load them (using the
857 "modprobe" command) before you can use them. If you say Y
858 here, some parts of the kernel will be able to load modules
859 automatically: when a part of the kernel needs a module, it
860 runs modprobe with the appropriate arguments, thereby
861 loading the module if it is available. If unsure, say Y.
862
863config STOP_MACHINE
864 bool
865 default y
866 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
867 help
868 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100869
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100870source "block/Kconfig"
Avi Kivitye98c3202007-10-16 23:27:31 -0700871
872config PREEMPT_NOTIFIERS
873 bool
Paul E. McKenneye260be62008-01-25 21:08:24 +0100874
Paul E. McKenneye260be62008-01-25 21:08:24 +0100875config CLASSIC_RCU
Paul E. McKenney21bbb392008-03-10 11:43:57 -0700876 def_bool !PREEMPT_RCU
Paul E. McKenneye260be62008-01-25 21:08:24 +0100877 help
878 This option selects the classic RCU implementation that is
879 designed for best read-side performance on non-realtime
Paul E. McKenney21bbb392008-03-10 11:43:57 -0700880 systems. Classic RCU is the default. Note that the
881 PREEMPT_RCU symbol is used to select/deselect this option.