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Roman Zippelface4372006-06-08 22:12:45 -07001config DEFCONFIG_LIST
2 string
Paolo 'Blaisorblade' Giarrussob2670eac2006-10-19 23:28:23 -07003 depends on !UML
Roman Zippelface4372006-06-08 22:12:45 -07004 option defconfig_list
5 default "/lib/modules/$UNAME_RELEASE/.config"
6 default "/etc/kernel-config"
7 default "/boot/config-$UNAME_RELEASE"
8 default "arch/$ARCH/defconfig"
9
Linus Torvalds1da177e2005-04-16 15:20:36 -070010menu "Code maturity level options"
11
12config EXPERIMENTAL
13 bool "Prompt for development and/or incomplete code/drivers"
14 ---help---
15 Some of the various things that Linux supports (such as network
16 drivers, file systems, network protocols, etc.) can be in a state
17 of development where the functionality, stability, or the level of
18 testing is not yet high enough for general use. This is usually
19 known as the "alpha-test" phase among developers. If a feature is
20 currently in alpha-test, then the developers usually discourage
21 uninformed widespread use of this feature by the general public to
22 avoid "Why doesn't this work?" type mail messages. However, active
23 testing and use of these systems is welcomed. Just be aware that it
24 may not meet the normal level of reliability or it may fail to work
25 in some special cases. Detailed bug reports from people familiar
26 with the kernel internals are usually welcomed by the developers
27 (before submitting bug reports, please read the documents
28 <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
29 <file:Documentation/BUG-HUNTING>, and
30 <file:Documentation/oops-tracing.txt> in the kernel source).
31
32 This option will also make obsoleted drivers available. These are
33 drivers that have been replaced by something else, and/or are
34 scheduled to be removed in a future kernel release.
35
36 Unless you intend to help test and develop a feature or driver that
37 falls into this category, or you have a situation that requires
38 using these features, you should probably say N here, which will
39 cause the configurator to present you with fewer choices. If
40 you say Y here, you will be offered the choice of using features or
41 drivers that are currently considered to be in the alpha-test phase.
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043config BROKEN
44 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46config BROKEN_ON_SMP
47 bool
48 depends on BROKEN || !SMP
49 default y
50
51config LOCK_KERNEL
52 bool
53 depends on SMP || PREEMPT
54 default y
55
56config INIT_ENV_ARG_LIMIT
57 int
Adrian Bunkdd673bc2006-06-30 01:55:51 -070058 default 32 if !UML
59 default 128 if UML
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 help
Randy Dunlap34ad92c2005-10-30 15:01:46 -080061 Maximum of each of the number of arguments and environment
62 variables passed to init from the kernel command line.
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64endmenu
65
66menu "General setup"
67
68config LOCALVERSION
69 string "Local version - append to kernel release"
70 help
71 Append an extra string to the end of your kernel version.
72 This will show up when you type uname, for example.
73 The string you set here will be appended after the contents of
74 any files with a filename matching localversion* in your
75 object and source tree, in that order. Your total string can
76 be a maximum of 64 characters.
77
Ryan Andersonaaebf432005-07-31 04:57:49 -040078config LOCALVERSION_AUTO
79 bool "Automatically append version information to the version string"
80 default y
81 help
82 This will try to automatically determine if the current tree is a
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020083 release tree by looking for git tags that belong to the current
84 top of tree revision.
Ryan Andersonaaebf432005-07-31 04:57:49 -040085
86 A string of the format -gxxxxxxxx will be added to the localversion
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020087 if a git-based tree is found. The string generated by this will be
Ryan Andersonaaebf432005-07-31 04:57:49 -040088 appended after any matching localversion* files, and after the value
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020089 set in CONFIG_LOCALVERSION.
Ryan Andersonaaebf432005-07-31 04:57:49 -040090
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020091 (The actual string used here is the first eight characters produced
92 by running the command:
93
94 $ git rev-parse --verify HEAD
95
96 which is done within the script "scripts/setlocalversion".)
Ryan Andersonaaebf432005-07-31 04:57:49 -040097
Linus Torvalds1da177e2005-04-16 15:20:36 -070098config SWAP
99 bool "Support for paging of anonymous memory (swap)"
David Howells93614012006-09-30 20:45:40 +0200100 depends on MMU && BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 default y
102 help
103 This option allows you to choose whether you want to have support
Jesper Juhl92c35042006-01-15 02:40:08 +0100104 for so called swap devices or swap files in your kernel that are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 used to provide more virtual memory than the actual RAM present
106 in your computer. If unsure say Y.
107
108config SYSVIPC
109 bool "System V IPC"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 ---help---
111 Inter Process Communication is a suite of library functions and
112 system calls which let processes (running programs) synchronize and
113 exchange information. It is generally considered to be a good thing,
114 and some programs won't run unless you say Y here. In particular, if
115 you want to run the DOS emulator dosemu under Linux (read the
116 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
117 you'll need to say Y here.
118
119 You can find documentation about IPC with "info ipc" and also in
120 section 6.4 of the Linux Programmer's Guide, available from
121 <http://www.tldp.org/guides.html>.
122
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800123config SYSVIPC_SYSCTL
124 bool
125 depends on SYSVIPC
126 depends on SYSCTL
127 default y
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129config POSIX_MQUEUE
130 bool "POSIX Message Queues"
131 depends on NET && EXPERIMENTAL
132 ---help---
133 POSIX variant of message queues is a part of IPC. In POSIX message
134 queues every message has a priority which decides about succession
135 of receiving it by a process. If you want to compile and run
136 programs written e.g. for Solaris with use of its POSIX message
Robert P. J. Dayb0e37652007-05-09 07:25:13 +0200137 queues (functions mq_*) say Y here.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139 POSIX message queues are visible as a filesystem called 'mqueue'
140 and can be mounted somewhere if you want to do filesystem
141 operations on message queues.
142
143 If unsure, say Y.
144
145config BSD_PROCESS_ACCT
146 bool "BSD Process Accounting"
147 help
148 If you say Y here, a user level program will be able to instruct the
149 kernel (via a special system call) to write process accounting
150 information to a file: whenever a process exits, information about
151 that process will be appended to the file by the kernel. The
152 information includes things such as creation time, owning user,
153 command name, memory usage, controlling terminal etc. (the complete
154 list is in the struct acct in <file:include/linux/acct.h>). It is
155 up to the user level program to do useful things with this
156 information. This is generally a good idea, so say Y.
157
158config BSD_PROCESS_ACCT_V3
159 bool "BSD Process Accounting version 3 file format"
160 depends on BSD_PROCESS_ACCT
161 default n
162 help
163 If you say Y here, the process accounting information is written
164 in a new file format that also logs the process IDs of each
165 process and it's parent. Note that this file format is incompatible
166 with previous v0/v1/v2 file formats, so you will need updated tools
167 for processing it. A preliminary version of these tools is available
168 at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
169
Shailabh Nagarc7572492006-07-14 00:24:40 -0700170config TASKSTATS
171 bool "Export task/process statistics through netlink (EXPERIMENTAL)"
172 depends on NET
173 default n
174 help
175 Export selected statistics for tasks/processes through the
176 generic netlink interface. Unlike BSD process accounting, the
177 statistics are available during the lifetime of tasks/processes as
178 responses to commands. Like BSD accounting, they are sent to user
179 space on task exit.
180
181 Say N if unsure.
182
Shailabh Nagarca74e922006-07-14 00:24:36 -0700183config TASK_DELAY_ACCT
184 bool "Enable per-task delay accounting (EXPERIMENTAL)"
Shailabh Nagar6f449932006-07-14 00:24:41 -0700185 depends on TASKSTATS
Shailabh Nagarca74e922006-07-14 00:24:36 -0700186 help
187 Collect information on time spent by a task waiting for system
188 resources like cpu, synchronous block I/O completion and swapping
189 in pages. Such statistics can help in setting a task's priorities
190 relative to other tasks for cpu, io, rss limits etc.
191
192 Say N if unsure.
193
Alexey Dobriyan18f705f2007-02-10 01:46:44 -0800194config TASK_XACCT
195 bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
196 depends on TASKSTATS
197 help
198 Collect extended task accounting data and send the data
199 to userland for processing over the taskstats interface.
200
201 Say N if unsure.
202
203config TASK_IO_ACCOUNTING
204 bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
205 depends on TASK_XACCT
206 help
207 Collect information on the number of bytes of storage I/O which this
208 task has caused.
209
210 Say N if unsure.
211
Cedric Le Goateracce2922007-07-15 23:40:59 -0700212config USER_NS
213 bool "User Namespaces (EXPERIMENTAL)"
214 default n
215 depends on EXPERIMENTAL
216 help
217 Support user namespaces. This allows containers, i.e.
218 vservers, to use user namespaces to provide different
219 user info for different servers. If unsure, say N.
220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221config AUDIT
222 bool "Auditing support"
Chris Wright804a6a492005-05-11 10:52:45 +0100223 depends on NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 help
225 Enable auditing infrastructure that can be used with another
226 kernel subsystem, such as SELinux (which requires this for
227 logging of avc messages output). Does not do system-call
228 auditing without CONFIG_AUDITSYSCALL.
229
230config AUDITSYSCALL
231 bool "Enable system-call auditing support"
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800232 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 default y if SECURITY_SELINUX
234 help
235 Enable low-overhead system-call auditing infrastructure that
236 can be used independently or with another kernel subsystem,
Amy Griffisf368c07d2006-04-07 16:55:56 -0400237 such as SELinux. To use audit's filesystem watch feature, please
238 ensure that INOTIFY is configured.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276config CPUSETS
277 bool "Cpuset support"
278 depends on SMP
279 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700280 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 allow dynamically partitioning a system into sets of CPUs and
282 Memory Nodes and assigning tasks to run only within those sets.
283 This is primarily useful on large SMP or NUMA systems.
284
285 Say N if unsure.
286
Kay Sievers88a22c92006-09-14 11:23:28 +0200287config SYSFS_DEPRECATED
288 bool "Create deprecated sysfs files"
289 default y
290 help
291 This option creates deprecated symlinks such as the
292 "device"-link, the <subsystem>:<name>-link, and the
293 "bus"-link. It may also add deprecated key in the
294 uevent environment.
295 None of these features or values should be used today, as
296 they export driver core implementation details to userspace
297 or export properties which can't be kept stable across kernel
298 releases.
299
300 If enabled, this option will also move any device structures
David Sterba3dde6ad2007-05-09 07:12:20 +0200301 that belong to a class, back into the /sys/class hierarchy, in
Kay Sievers88a22c92006-09-14 11:23:28 +0200302 order to support older versions of udev.
303
304 If you are using a distro that was released in 2006 or later,
305 it should be safe to say N here.
306
Jens Axboeb86ff9812006-03-23 19:56:55 +0100307config RELAY
308 bool "Kernel->user space relay support (formerly relayfs)"
309 help
310 This option enables support for relay interface support in
311 certain file systems (such as debugfs).
312 It is designed to provide an efficient mechanism for tools and
313 facilities to relay large amounts of data from kernel space to
314 user space.
315
316 If unsure, say N.
317
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800318config BLK_DEV_INITRD
319 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
320 depends on BROKEN || !FRV
321 help
322 The initial RAM filesystem is a ramfs which is loaded by the
323 boot loader (loadlin or lilo) and that is mounted as root
324 before the normal boot procedure. It is typically used to
325 load modules needed to mount the "real" root file system,
326 etc. See <file:Documentation/initrd.txt> for details.
327
328 If RAM disk support (BLK_DEV_RAM) is also included, this
329 also enables initial RAM disk (initrd) support and adds
330 15 Kbytes (more on some other architectures) to the kernel size.
331
332 If unsure say Y.
333
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800334if BLK_DEV_INITRD
335
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200336source "usr/Kconfig"
337
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800338endif
339
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800340config CC_OPTIMIZE_FOR_SIZE
341 bool "Optimize for size (Look out for broken compilers!)"
342 default y
Paul Mundt32582fa2007-07-25 11:27:05 +0900343 depends on ARM || H8300 || SUPERH || EXPERIMENTAL
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800344 help
345 Enabling this option will pass "-Os" instead of "-O2" to gcc
346 resulting in a smaller kernel.
347
348 WARNING: some versions of gcc may generate incorrect code with this
349 option. If problems are observed, a gcc upgrade may be needed.
350
351 If unsure, say N.
352
Randy Dunlap08470622006-09-30 23:28:13 -0700353config SYSCTL
354 bool
355
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356menuconfig EMBEDDED
357 bool "Configure standard kernel features (for small systems)"
358 help
359 This option allows certain base kernel options and settings
360 to be disabled or tweaked. This is for specialized
361 environments which can tolerate a "non-standard" kernel.
362 Only use this if you really know what you are doing.
363
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700364config UID16
365 bool "Enable 16-bit UID system calls" if EMBEDDED
Bryan Wu1394f032007-05-06 14:50:22 -0700366 depends on ARM || BFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION)
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700367 default y
368 help
369 This enables the legacy 16-bit UID syscall wrappers.
370
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700371config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700372 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800373 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700374 select SYSCTL
375 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800376 sys_sysctl uses binary paths that have been found challenging
377 to properly maintain and use. The interface in /proc/sys
378 using paths with ascii names is now the primary path to this
379 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700380
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800381 Almost nothing using the binary sysctl interface so if you are
382 trying to save some space it is probably safe to disable this,
383 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700384
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800385 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700386
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100388 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 default y
390 help
391 Say Y here to let the kernel print out symbolic crash information and
392 symbolic stack backtraces. This increases the size of the kernel
393 somewhat, as all symbols have to be loaded into the kernel image.
394
395config KALLSYMS_ALL
396 bool "Include all symbols in kallsyms"
397 depends on DEBUG_KERNEL && KALLSYMS
398 help
399 Normally kallsyms only contains the symbols of functions, for nicer
400 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200401 symbols too: say Y here to include all symbols, if you need them
402 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
404 Say N.
405
406config KALLSYMS_EXTRA_PASS
407 bool "Do an extra kallsyms pass"
408 depends on KALLSYMS
409 help
410 If kallsyms is not working correctly, the build will fail with
411 inconsistent kallsyms data. If that occurs, log a bug report and
412 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
413 Always say N here unless you find a bug in kallsyms, which must be
414 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
415 you wait for kallsyms to be fixed.
416
Matt Mackalld59745c2005-05-01 08:59:02 -0700417
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800418config HOTPLUG
419 bool "Support for hot-pluggable devices" if EMBEDDED
420 default y
421 help
422 This option is provided for the case where no hotplug or uevent
423 capabilities is wanted by the kernel. You should only consider
424 disabling this option for embedded systems that do not use modules, a
425 dynamic /dev tree, or dynamic device discovery. Just say Y.
426
Matt Mackalld59745c2005-05-01 08:59:02 -0700427config PRINTK
428 default y
429 bool "Enable support for printk" if EMBEDDED
430 help
431 This option enables normal printk support. Removing it
432 eliminates most of the message strings from the kernel image
433 and makes the kernel more or less silent. As this makes it
434 very difficult to diagnose system problems, saying N here is
435 strongly discouraged.
436
Matt Mackallc8538a72005-05-01 08:59:01 -0700437config BUG
438 bool "BUG() support" if EMBEDDED
439 default y
440 help
441 Disabling this option eliminates support for BUG and WARN, reducing
442 the size of your kernel image and potentially quietly ignoring
443 numerous fatal conditions. You should only consider disabling this
444 option for embedded systems with no facilities for reporting errors.
445 Just say Y.
446
Matt Mackall708e9a72006-01-08 01:05:25 -0800447config ELF_CORE
448 default y
449 bool "Enable ELF core dumps" if EMBEDDED
450 help
451 Enable support for generating core dumps. Disabling saves about 4k.
452
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453config BASE_FULL
454 default y
455 bool "Enable full-sized data structures for core" if EMBEDDED
456 help
457 Disabling this option reduces the size of miscellaneous core
458 kernel data structures. This saves memory on small machines,
459 but may reduce performance.
460
461config FUTEX
462 bool "Enable futex support" if EMBEDDED
463 default y
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700464 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 help
466 Disabling this option will cause the kernel to be built without
467 support for "fast userspace mutexes". The resulting kernel may not
468 run glibc-based applications correctly.
469
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700470config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700471 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700472
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473config EPOLL
474 bool "Enable eventpoll support" if EMBEDDED
475 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700476 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 help
478 Disabling this option will cause the kernel to be built without
479 support for epoll family of system calls.
480
Davide Libenzifba2afa2007-05-10 22:23:13 -0700481config SIGNALFD
482 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700483 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700484 default y
485 help
486 Enable the signalfd() system call that allows to receive signals
487 on a file descriptor.
488
489 If unsure, say Y.
490
Davide Libenzib215e282007-05-10 22:23:16 -0700491config TIMERFD
492 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700493 select ANON_INODES
Davide Libenzib215e282007-05-10 22:23:16 -0700494 default y
495 help
496 Enable the timerfd() system call that allows to receive timer
497 events on a file descriptor.
498
499 If unsure, say Y.
500
Davide Libenzie1ad7462007-05-10 22:23:19 -0700501config EVENTFD
502 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700503 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700504 default y
505 help
506 Enable the eventfd() system call that allows to receive both
507 kernel notification (ie. KAIO) or userspace notifications.
508
509 If unsure, say Y.
510
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511config SHMEM
512 bool "Use full shmem filesystem" if EMBEDDED
513 default y
514 depends on MMU
515 help
516 The shmem is an internal filesystem used to manage shared memory.
517 It is backed by swap and manages resource limits. It is also exported
518 to userspace as tmpfs if TMPFS is enabled. Disabling this
519 option replaces shmem and tmpfs with the much simpler ramfs code,
520 which may be appropriate on small systems without swap.
521
Christoph Lameterf8891e52006-06-30 01:55:45 -0700522config VM_EVENT_COUNTERS
523 default y
524 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
525 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800526 VM event counters are needed for event counts to be shown.
527 This option allows the disabling of the VM event counters
528 on EMBEDDED systems. /proc/vmstat will only show page counts
529 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700530
Christoph Lameter41ecc552007-05-09 02:32:44 -0700531config SLUB_DEBUG
532 default y
533 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterd4751a22007-05-10 03:15:40 -0700534 depends on SLUB
Christoph Lameter41ecc552007-05-09 02:32:44 -0700535 help
536 SLUB has extensive debug support features. Disabling these can
537 result in significant savings in code size. This also disables
538 SLUB sysfs support. /sys/slab will not exist and there will be
539 no support for cache validation etc.
540
Christoph Lameter81819f02007-05-06 14:49:36 -0700541choice
542 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700543 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700544 help
545 This option allows to select a slab allocator.
546
547config SLAB
548 bool "SLAB"
549 help
550 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700551 well in all environments. It organizes cache hot objects in
Christoph Lameter81819f02007-05-06 14:49:36 -0700552 per cpu and per node queues. SLAB is the default choice for
Christoph Lameter34013882007-05-09 02:32:47 -0700553 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700554
555config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700556 bool "SLUB (Unqueued Allocator)"
557 help
558 SLUB is a slab allocator that minimizes cache line usage
559 instead of managing queues of cached objects (SLAB approach).
560 Per cpu caching is realized using slabs of objects instead
561 of queues of objects. SLUB can use memory efficiently
Christoph Lameter34013882007-05-09 02:32:47 -0700562 and has enhanced diagnostics.
Christoph Lameter81819f02007-05-06 14:49:36 -0700563
564config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700565 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700566 bool "SLOB (Simple Allocator)"
567 help
568 SLOB replaces the SLAB allocator with a drastically simpler
Nick Pigginafc0ced2007-05-16 22:10:49 -0700569 allocator. SLOB is more space efficient than SLAB but does not
Christoph Lameter34013882007-05-09 02:32:47 -0700570 scale well (single lock for all operations) and is also highly
571 susceptible to fragmentation. SLUB can accomplish a higher object
572 density. It is usually better to use SLUB instead of SLOB.
Christoph Lameter81819f02007-05-06 14:49:36 -0700573
574endchoice
575
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576endmenu # General setup
577
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700578config RT_MUTEXES
579 boolean
580 select PLIST
581
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582config TINY_SHMEM
583 default !SHMEM
584 bool
585
586config BASE_SMALL
587 int
588 default 0 if BASE_FULL
589 default 1 if !BASE_FULL
590
Jan Engelhardt66da5732007-07-15 23:39:29 -0700591menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 bool "Enable loadable module support"
593 help
594 Kernel modules are small pieces of compiled code which can
595 be inserted in the running kernel, rather than being
596 permanently built into the kernel. You use the "modprobe"
597 tool to add (and sometimes remove) them. If you say Y here,
598 many parts of the kernel can be built as modules (by
599 answering M instead of Y where indicated): this is most
600 useful for infrequently used options which are not required
601 for booting. For more information, see the man pages for
602 modprobe, lsmod, modinfo, insmod and rmmod.
603
604 If you say Y here, you will need to run "make
605 modules_install" to put the modules under /lib/modules/
606 where modprobe can find them (you may need to be root to do
607 this).
608
609 If unsure, say Y.
610
611config MODULE_UNLOAD
612 bool "Module unloading"
613 depends on MODULES
614 help
615 Without this option you will not be able to unload any
616 modules (note that some modules may not be unloadable
617 anyway), which makes your kernel slightly smaller and
618 simpler. If unsure, say Y.
619
620config MODULE_FORCE_UNLOAD
621 bool "Forced module unloading"
622 depends on MODULE_UNLOAD && EXPERIMENTAL
623 help
624 This option allows you to force a module to unload, even if the
625 kernel believes it is unsafe: the kernel will remove the module
626 without waiting for anyone to stop using it (using the -f option to
627 rmmod). This is mainly for kernel developers and desperate users.
628 If unsure, say N.
629
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100631 bool "Module versioning support"
632 depends on MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 help
634 Usually, you have to use modules compiled with your kernel.
635 Saying Y here makes it sometimes possible to use modules
636 compiled for different kernels, by adding enough information
637 to the modules to (hopefully) spot any changes which would
638 make them incompatible with the kernel you are running. If
639 unsure, say N.
640
641config MODULE_SRCVERSION_ALL
642 bool "Source checksum for all modules"
643 depends on MODULES
644 help
645 Modules which contain a MODULE_VERSION get an extra "srcversion"
646 field inserted into their modinfo section, which contains a
647 sum of the source files which made it. This helps maintainers
648 see exactly which source was used to build a module (since
649 others sometimes change the module source without updating
650 the version). With this option, such a "srcversion" field
651 will be created for all modules. If unsure, say N.
652
653config KMOD
654 bool "Automatic kernel module loading"
655 depends on MODULES
656 help
657 Normally when you have selected some parts of the kernel to
658 be created as kernel modules, you must load them (using the
659 "modprobe" command) before you can use them. If you say Y
660 here, some parts of the kernel will be able to load modules
661 automatically: when a part of the kernel needs a module, it
662 runs modprobe with the appropriate arguments, thereby
663 loading the module if it is available. If unsure, say Y.
664
665config STOP_MACHINE
666 bool
667 default y
668 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
669 help
670 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100671
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100672source "block/Kconfig"