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Roman Zippelface4372006-06-08 22:12:45 -07001config DEFCONFIG_LIST
2 string
Paolo 'Blaisorblade' Giarrussob2670eac2006-10-19 23:28:23 -07003 depends on !UML
Roman Zippelface4372006-06-08 22:12:45 -07004 option defconfig_list
5 default "/lib/modules/$UNAME_RELEASE/.config"
6 default "/etc/kernel-config"
7 default "/boot/config-$UNAME_RELEASE"
8 default "arch/$ARCH/defconfig"
9
Al Boldiff0cfc62007-07-31 00:39:23 -070010menu "General setup"
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
12config EXPERIMENTAL
13 bool "Prompt for development and/or incomplete code/drivers"
14 ---help---
15 Some of the various things that Linux supports (such as network
16 drivers, file systems, network protocols, etc.) can be in a state
17 of development where the functionality, stability, or the level of
18 testing is not yet high enough for general use. This is usually
19 known as the "alpha-test" phase among developers. If a feature is
20 currently in alpha-test, then the developers usually discourage
21 uninformed widespread use of this feature by the general public to
22 avoid "Why doesn't this work?" type mail messages. However, active
23 testing and use of these systems is welcomed. Just be aware that it
24 may not meet the normal level of reliability or it may fail to work
25 in some special cases. Detailed bug reports from people familiar
26 with the kernel internals are usually welcomed by the developers
27 (before submitting bug reports, please read the documents
28 <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
29 <file:Documentation/BUG-HUNTING>, and
30 <file:Documentation/oops-tracing.txt> in the kernel source).
31
32 This option will also make obsoleted drivers available. These are
33 drivers that have been replaced by something else, and/or are
34 scheduled to be removed in a future kernel release.
35
36 Unless you intend to help test and develop a feature or driver that
37 falls into this category, or you have a situation that requires
38 using these features, you should probably say N here, which will
39 cause the configurator to present you with fewer choices. If
40 you say Y here, you will be offered the choice of using features or
41 drivers that are currently considered to be in the alpha-test phase.
42
Linus Torvalds1da177e2005-04-16 15:20:36 -070043config BROKEN
44 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46config BROKEN_ON_SMP
47 bool
48 depends on BROKEN || !SMP
49 default y
50
51config LOCK_KERNEL
52 bool
53 depends on SMP || PREEMPT
54 default y
55
56config INIT_ENV_ARG_LIMIT
57 int
Adrian Bunkdd673bc2006-06-30 01:55:51 -070058 default 32 if !UML
59 default 128 if UML
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 help
Randy Dunlap34ad92c2005-10-30 15:01:46 -080061 Maximum of each of the number of arguments and environment
62 variables passed to init from the kernel command line.
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65config LOCALVERSION
66 string "Local version - append to kernel release"
67 help
68 Append an extra string to the end of your kernel version.
69 This will show up when you type uname, for example.
70 The string you set here will be appended after the contents of
71 any files with a filename matching localversion* in your
72 object and source tree, in that order. Your total string can
73 be a maximum of 64 characters.
74
Ryan Andersonaaebf432005-07-31 04:57:49 -040075config LOCALVERSION_AUTO
76 bool "Automatically append version information to the version string"
77 default y
78 help
79 This will try to automatically determine if the current tree is a
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020080 release tree by looking for git tags that belong to the current
81 top of tree revision.
Ryan Andersonaaebf432005-07-31 04:57:49 -040082
83 A string of the format -gxxxxxxxx will be added to the localversion
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020084 if a git-based tree is found. The string generated by this will be
Ryan Andersonaaebf432005-07-31 04:57:49 -040085 appended after any matching localversion* files, and after the value
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020086 set in CONFIG_LOCALVERSION.
Ryan Andersonaaebf432005-07-31 04:57:49 -040087
Robert P. J. Day6e5a5422007-05-01 23:08:11 +020088 (The actual string used here is the first eight characters produced
89 by running the command:
90
91 $ git rev-parse --verify HEAD
92
93 which is done within the script "scripts/setlocalversion".)
Ryan Andersonaaebf432005-07-31 04:57:49 -040094
Linus Torvalds1da177e2005-04-16 15:20:36 -070095config SWAP
96 bool "Support for paging of anonymous memory (swap)"
David Howells93614012006-09-30 20:45:40 +020097 depends on MMU && BLOCK
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 default y
99 help
100 This option allows you to choose whether you want to have support
Jesper Juhl92c35042006-01-15 02:40:08 +0100101 for so called swap devices or swap files in your kernel that are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 used to provide more virtual memory than the actual RAM present
103 in your computer. If unsure say Y.
104
105config SYSVIPC
106 bool "System V IPC"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 ---help---
108 Inter Process Communication is a suite of library functions and
109 system calls which let processes (running programs) synchronize and
110 exchange information. It is generally considered to be a good thing,
111 and some programs won't run unless you say Y here. In particular, if
112 you want to run the DOS emulator dosemu under Linux (read the
113 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
114 you'll need to say Y here.
115
116 You can find documentation about IPC with "info ipc" and also in
117 section 6.4 of the Linux Programmer's Guide, available from
118 <http://www.tldp.org/guides.html>.
119
Eric W. Biedermana5494dc2007-02-14 00:34:06 -0800120config SYSVIPC_SYSCTL
121 bool
122 depends on SYSVIPC
123 depends on SYSCTL
124 default y
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126config POSIX_MQUEUE
127 bool "POSIX Message Queues"
128 depends on NET && EXPERIMENTAL
129 ---help---
130 POSIX variant of message queues is a part of IPC. In POSIX message
131 queues every message has a priority which decides about succession
132 of receiving it by a process. If you want to compile and run
133 programs written e.g. for Solaris with use of its POSIX message
Robert P. J. Dayb0e37652007-05-09 07:25:13 +0200134 queues (functions mq_*) say Y here.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
136 POSIX message queues are visible as a filesystem called 'mqueue'
137 and can be mounted somewhere if you want to do filesystem
138 operations on message queues.
139
140 If unsure, say Y.
141
142config BSD_PROCESS_ACCT
143 bool "BSD Process Accounting"
144 help
145 If you say Y here, a user level program will be able to instruct the
146 kernel (via a special system call) to write process accounting
147 information to a file: whenever a process exits, information about
148 that process will be appended to the file by the kernel. The
149 information includes things such as creation time, owning user,
150 command name, memory usage, controlling terminal etc. (the complete
151 list is in the struct acct in <file:include/linux/acct.h>). It is
152 up to the user level program to do useful things with this
153 information. This is generally a good idea, so say Y.
154
155config BSD_PROCESS_ACCT_V3
156 bool "BSD Process Accounting version 3 file format"
157 depends on BSD_PROCESS_ACCT
158 default n
159 help
160 If you say Y here, the process accounting information is written
161 in a new file format that also logs the process IDs of each
162 process and it's parent. Note that this file format is incompatible
163 with previous v0/v1/v2 file formats, so you will need updated tools
164 for processing it. A preliminary version of these tools is available
165 at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
166
Shailabh Nagarc7572492006-07-14 00:24:40 -0700167config TASKSTATS
168 bool "Export task/process statistics through netlink (EXPERIMENTAL)"
169 depends on NET
170 default n
171 help
172 Export selected statistics for tasks/processes through the
173 generic netlink interface. Unlike BSD process accounting, the
174 statistics are available during the lifetime of tasks/processes as
175 responses to commands. Like BSD accounting, they are sent to user
176 space on task exit.
177
178 Say N if unsure.
179
Shailabh Nagarca74e922006-07-14 00:24:36 -0700180config TASK_DELAY_ACCT
181 bool "Enable per-task delay accounting (EXPERIMENTAL)"
Shailabh Nagar6f449932006-07-14 00:24:41 -0700182 depends on TASKSTATS
Shailabh Nagarca74e922006-07-14 00:24:36 -0700183 help
184 Collect information on time spent by a task waiting for system
185 resources like cpu, synchronous block I/O completion and swapping
186 in pages. Such statistics can help in setting a task's priorities
187 relative to other tasks for cpu, io, rss limits etc.
188
189 Say N if unsure.
190
Alexey Dobriyan18f705f2007-02-10 01:46:44 -0800191config TASK_XACCT
192 bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
193 depends on TASKSTATS
194 help
195 Collect extended task accounting data and send the data
196 to userland for processing over the taskstats interface.
197
198 Say N if unsure.
199
200config TASK_IO_ACCOUNTING
201 bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
202 depends on TASK_XACCT
203 help
204 Collect information on the number of bytes of storage I/O which this
205 task has caused.
206
207 Say N if unsure.
208
Cedric Le Goateracce2922007-07-15 23:40:59 -0700209config USER_NS
210 bool "User Namespaces (EXPERIMENTAL)"
211 default n
212 depends on EXPERIMENTAL
213 help
214 Support user namespaces. This allows containers, i.e.
215 vservers, to use user namespaces to provide different
216 user info for different servers. If unsure, say N.
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218config AUDIT
219 bool "Auditing support"
Chris Wright804a6a492005-05-11 10:52:45 +0100220 depends on NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 help
222 Enable auditing infrastructure that can be used with another
223 kernel subsystem, such as SELinux (which requires this for
224 logging of avc messages output). Does not do system-call
225 auditing without CONFIG_AUDITSYSCALL.
226
227config AUDITSYSCALL
228 bool "Enable system-call auditing support"
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800229 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 default y if SECURITY_SELINUX
231 help
232 Enable low-overhead system-call auditing infrastructure that
233 can be used independently or with another kernel subsystem,
Amy Griffisf368c07d2006-04-07 16:55:56 -0400234 such as SELinux. To use audit's filesystem watch feature, please
235 ensure that INOTIFY is configured.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237config IKCONFIG
Ross Birof2443ab2006-09-30 23:27:25 -0700238 tristate "Kernel .config support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 ---help---
240 This option enables the complete Linux kernel ".config" file
241 contents to be saved in the kernel. It provides documentation
242 of which kernel options are used in a running kernel or in an
243 on-disk kernel. This information can be extracted from the kernel
244 image file with the script scripts/extract-ikconfig and used as
245 input to rebuild the current kernel or to build another kernel.
246 It can also be extracted from a running kernel by reading
247 /proc/config.gz if enabled (below).
248
249config IKCONFIG_PROC
250 bool "Enable access to .config through /proc/config.gz"
251 depends on IKCONFIG && PROC_FS
252 ---help---
253 This option enables access to the kernel configuration file
254 through /proc/config.gz.
255
Alistair John Strachan794543a2007-05-08 00:31:15 -0700256config LOG_BUF_SHIFT
257 int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
258 range 12 21
259 default 17 if S390 || LOCKDEP
260 default 16 if X86_NUMAQ || IA64
261 default 15 if SMP
262 default 14
263 help
264 Select kernel log buffer size as a power of 2.
265 Defaults and Examples:
266 17 => 128 KB for S/390
267 16 => 64 KB for x86 NUMAQ or IA-64
268 15 => 32 KB for SMP
269 14 => 16 KB for uniprocessor
270 13 => 8 KB
271 12 => 4 KB
272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273config CPUSETS
274 bool "Cpuset support"
275 depends on SMP
276 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700277 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 allow dynamically partitioning a system into sets of CPUs and
279 Memory Nodes and assigning tasks to run only within those sets.
280 This is primarily useful on large SMP or NUMA systems.
281
282 Say N if unsure.
283
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200284config FAIR_GROUP_SCHED
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200285 bool "Fair group CPU scheduler"
Ingo Molnarde8d5852007-10-15 17:00:09 +0200286 default y
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +0200287 depends on EXPERIMENTAL
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200288 help
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200289 This feature lets CPU scheduler recognize task groups and control CPU
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +0200290 bandwidth allocation to such task groups.
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200291
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200292choice
293 depends on FAIR_GROUP_SCHED
294 prompt "Basis for grouping tasks"
295 default FAIR_USER_SCHED
296
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200297config FAIR_USER_SCHED
298 bool "user id"
299 help
300 This option will choose userid as the basis for grouping
301 tasks, thus providing equal CPU bandwidth to each user.
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200302
303endchoice
304
Kay Sievers88a22c92006-09-14 11:23:28 +0200305config SYSFS_DEPRECATED
306 bool "Create deprecated sysfs files"
307 default y
308 help
309 This option creates deprecated symlinks such as the
310 "device"-link, the <subsystem>:<name>-link, and the
311 "bus"-link. It may also add deprecated key in the
312 uevent environment.
313 None of these features or values should be used today, as
314 they export driver core implementation details to userspace
315 or export properties which can't be kept stable across kernel
316 releases.
317
318 If enabled, this option will also move any device structures
David Sterba3dde6ad2007-05-09 07:12:20 +0200319 that belong to a class, back into the /sys/class hierarchy, in
Kay Sievers88a22c92006-09-14 11:23:28 +0200320 order to support older versions of udev.
321
322 If you are using a distro that was released in 2006 or later,
323 it should be safe to say N here.
324
Jens Axboeb86ff9812006-03-23 19:56:55 +0100325config RELAY
326 bool "Kernel->user space relay support (formerly relayfs)"
327 help
328 This option enables support for relay interface support in
329 certain file systems (such as debugfs).
330 It is designed to provide an efficient mechanism for tools and
331 facilities to relay large amounts of data from kernel space to
332 user space.
333
334 If unsure, say N.
335
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800336config BLK_DEV_INITRD
337 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
338 depends on BROKEN || !FRV
339 help
340 The initial RAM filesystem is a ramfs which is loaded by the
341 boot loader (loadlin or lilo) and that is mounted as root
342 before the normal boot procedure. It is typically used to
343 load modules needed to mount the "real" root file system,
344 etc. See <file:Documentation/initrd.txt> for details.
345
346 If RAM disk support (BLK_DEV_RAM) is also included, this
347 also enables initial RAM disk (initrd) support and adds
348 15 Kbytes (more on some other architectures) to the kernel size.
349
350 If unsure say Y.
351
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800352if BLK_DEV_INITRD
353
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200354source "usr/Kconfig"
355
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800356endif
357
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800358config CC_OPTIMIZE_FOR_SIZE
359 bool "Optimize for size (Look out for broken compilers!)"
360 default y
Paul Mundt32582fa2007-07-25 11:27:05 +0900361 depends on ARM || H8300 || SUPERH || EXPERIMENTAL
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800362 help
363 Enabling this option will pass "-Os" instead of "-O2" to gcc
364 resulting in a smaller kernel.
365
366 WARNING: some versions of gcc may generate incorrect code with this
367 option. If problems are observed, a gcc upgrade may be needed.
368
369 If unsure, say N.
370
Randy Dunlap08470622006-09-30 23:28:13 -0700371config SYSCTL
372 bool
373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374menuconfig EMBEDDED
375 bool "Configure standard kernel features (for small systems)"
376 help
377 This option allows certain base kernel options and settings
378 to be disabled or tweaked. This is for specialized
379 environments which can tolerate a "non-standard" kernel.
380 Only use this if you really know what you are doing.
381
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700382config UID16
383 bool "Enable 16-bit UID system calls" if EMBEDDED
Bryan Wu1394f032007-05-06 14:50:22 -0700384 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 -0700385 default y
386 help
387 This enables the legacy 16-bit UID syscall wrappers.
388
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700389config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700390 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800391 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700392 select SYSCTL
393 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800394 sys_sysctl uses binary paths that have been found challenging
395 to properly maintain and use. The interface in /proc/sys
396 using paths with ascii names is now the primary path to this
397 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700398
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800399 Almost nothing using the binary sysctl interface so if you are
400 trying to save some space it is probably safe to disable this,
401 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700402
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800403 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100406 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 default y
408 help
409 Say Y here to let the kernel print out symbolic crash information and
410 symbolic stack backtraces. This increases the size of the kernel
411 somewhat, as all symbols have to be loaded into the kernel image.
412
413config KALLSYMS_ALL
414 bool "Include all symbols in kallsyms"
415 depends on DEBUG_KERNEL && KALLSYMS
416 help
417 Normally kallsyms only contains the symbols of functions, for nicer
418 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200419 symbols too: say Y here to include all symbols, if you need them
420 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
422 Say N.
423
424config KALLSYMS_EXTRA_PASS
425 bool "Do an extra kallsyms pass"
426 depends on KALLSYMS
427 help
428 If kallsyms is not working correctly, the build will fail with
429 inconsistent kallsyms data. If that occurs, log a bug report and
430 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
431 Always say N here unless you find a bug in kallsyms, which must be
432 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
433 you wait for kallsyms to be fixed.
434
Matt Mackalld59745c2005-05-01 08:59:02 -0700435
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800436config HOTPLUG
437 bool "Support for hot-pluggable devices" if EMBEDDED
438 default y
439 help
440 This option is provided for the case where no hotplug or uevent
441 capabilities is wanted by the kernel. You should only consider
442 disabling this option for embedded systems that do not use modules, a
443 dynamic /dev tree, or dynamic device discovery. Just say Y.
444
Matt Mackalld59745c2005-05-01 08:59:02 -0700445config PRINTK
446 default y
447 bool "Enable support for printk" if EMBEDDED
448 help
449 This option enables normal printk support. Removing it
450 eliminates most of the message strings from the kernel image
451 and makes the kernel more or less silent. As this makes it
452 very difficult to diagnose system problems, saying N here is
453 strongly discouraged.
454
Matt Mackallc8538a72005-05-01 08:59:01 -0700455config BUG
456 bool "BUG() support" if EMBEDDED
457 default y
458 help
459 Disabling this option eliminates support for BUG and WARN, reducing
460 the size of your kernel image and potentially quietly ignoring
461 numerous fatal conditions. You should only consider disabling this
462 option for embedded systems with no facilities for reporting errors.
463 Just say Y.
464
Matt Mackall708e9a72006-01-08 01:05:25 -0800465config ELF_CORE
466 default y
467 bool "Enable ELF core dumps" if EMBEDDED
468 help
469 Enable support for generating core dumps. Disabling saves about 4k.
470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471config BASE_FULL
472 default y
473 bool "Enable full-sized data structures for core" if EMBEDDED
474 help
475 Disabling this option reduces the size of miscellaneous core
476 kernel data structures. This saves memory on small machines,
477 but may reduce performance.
478
479config FUTEX
480 bool "Enable futex support" if EMBEDDED
481 default y
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700482 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 help
484 Disabling this option will cause the kernel to be built without
485 support for "fast userspace mutexes". The resulting kernel may not
486 run glibc-based applications correctly.
487
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700488config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700489 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700490
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491config EPOLL
492 bool "Enable eventpoll support" if EMBEDDED
493 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700494 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 help
496 Disabling this option will cause the kernel to be built without
497 support for epoll family of system calls.
498
Davide Libenzifba2afa2007-05-10 22:23:13 -0700499config SIGNALFD
500 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700501 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700502 default y
503 help
504 Enable the signalfd() system call that allows to receive signals
505 on a file descriptor.
506
507 If unsure, say Y.
508
Davide Libenzib215e282007-05-10 22:23:16 -0700509config TIMERFD
510 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700511 select ANON_INODES
Andrew Mortone4260192007-09-18 22:46:41 -0700512 depends on BROKEN
Davide Libenzib215e282007-05-10 22:23:16 -0700513 default y
514 help
515 Enable the timerfd() system call that allows to receive timer
516 events on a file descriptor.
517
518 If unsure, say Y.
519
Davide Libenzie1ad7462007-05-10 22:23:19 -0700520config EVENTFD
521 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700522 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700523 default y
524 help
525 Enable the eventfd() system call that allows to receive both
526 kernel notification (ie. KAIO) or userspace notifications.
527
528 If unsure, say Y.
529
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530config SHMEM
531 bool "Use full shmem filesystem" if EMBEDDED
532 default y
533 depends on MMU
534 help
535 The shmem is an internal filesystem used to manage shared memory.
536 It is backed by swap and manages resource limits. It is also exported
537 to userspace as tmpfs if TMPFS is enabled. Disabling this
538 option replaces shmem and tmpfs with the much simpler ramfs code,
539 which may be appropriate on small systems without swap.
540
Christoph Lameterf8891e52006-06-30 01:55:45 -0700541config VM_EVENT_COUNTERS
542 default y
543 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
544 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800545 VM event counters are needed for event counts to be shown.
546 This option allows the disabling of the VM event counters
547 on EMBEDDED systems. /proc/vmstat will only show page counts
548 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700549
Christoph Lameter41ecc552007-05-09 02:32:44 -0700550config SLUB_DEBUG
551 default y
552 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterd4751a22007-05-10 03:15:40 -0700553 depends on SLUB
Christoph Lameter41ecc552007-05-09 02:32:44 -0700554 help
555 SLUB has extensive debug support features. Disabling these can
556 result in significant savings in code size. This also disables
557 SLUB sysfs support. /sys/slab will not exist and there will be
558 no support for cache validation etc.
559
Christoph Lameter81819f02007-05-06 14:49:36 -0700560choice
561 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700562 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700563 help
564 This option allows to select a slab allocator.
565
566config SLAB
567 bool "SLAB"
568 help
569 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700570 well in all environments. It organizes cache hot objects in
Christoph Lameter81819f02007-05-06 14:49:36 -0700571 per cpu and per node queues. SLAB is the default choice for
Christoph Lameter34013882007-05-09 02:32:47 -0700572 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700573
574config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700575 bool "SLUB (Unqueued Allocator)"
576 help
577 SLUB is a slab allocator that minimizes cache line usage
578 instead of managing queues of cached objects (SLAB approach).
579 Per cpu caching is realized using slabs of objects instead
580 of queues of objects. SLUB can use memory efficiently
Christoph Lameter34013882007-05-09 02:32:47 -0700581 and has enhanced diagnostics.
Christoph Lameter81819f02007-05-06 14:49:36 -0700582
583config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700584 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700585 bool "SLOB (Simple Allocator)"
586 help
587 SLOB replaces the SLAB allocator with a drastically simpler
Nick Pigginafc0ced2007-05-16 22:10:49 -0700588 allocator. SLOB is more space efficient than SLAB but does not
Christoph Lameter34013882007-05-09 02:32:47 -0700589 scale well (single lock for all operations) and is also highly
590 susceptible to fragmentation. SLUB can accomplish a higher object
591 density. It is usually better to use SLUB instead of SLOB.
Christoph Lameter81819f02007-05-06 14:49:36 -0700592
593endchoice
594
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595endmenu # General setup
596
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700597config RT_MUTEXES
598 boolean
599 select PLIST
600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601config TINY_SHMEM
602 default !SHMEM
603 bool
604
605config BASE_SMALL
606 int
607 default 0 if BASE_FULL
608 default 1 if !BASE_FULL
609
Jan Engelhardt66da5732007-07-15 23:39:29 -0700610menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 bool "Enable loadable module support"
612 help
613 Kernel modules are small pieces of compiled code which can
614 be inserted in the running kernel, rather than being
615 permanently built into the kernel. You use the "modprobe"
616 tool to add (and sometimes remove) them. If you say Y here,
617 many parts of the kernel can be built as modules (by
618 answering M instead of Y where indicated): this is most
619 useful for infrequently used options which are not required
620 for booting. For more information, see the man pages for
621 modprobe, lsmod, modinfo, insmod and rmmod.
622
623 If you say Y here, you will need to run "make
624 modules_install" to put the modules under /lib/modules/
625 where modprobe can find them (you may need to be root to do
626 this).
627
628 If unsure, say Y.
629
630config MODULE_UNLOAD
631 bool "Module unloading"
632 depends on MODULES
633 help
634 Without this option you will not be able to unload any
635 modules (note that some modules may not be unloadable
636 anyway), which makes your kernel slightly smaller and
637 simpler. If unsure, say Y.
638
639config MODULE_FORCE_UNLOAD
640 bool "Forced module unloading"
641 depends on MODULE_UNLOAD && EXPERIMENTAL
642 help
643 This option allows you to force a module to unload, even if the
644 kernel believes it is unsafe: the kernel will remove the module
645 without waiting for anyone to stop using it (using the -f option to
646 rmmod). This is mainly for kernel developers and desperate users.
647 If unsure, say N.
648
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100650 bool "Module versioning support"
651 depends on MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 help
653 Usually, you have to use modules compiled with your kernel.
654 Saying Y here makes it sometimes possible to use modules
655 compiled for different kernels, by adding enough information
656 to the modules to (hopefully) spot any changes which would
657 make them incompatible with the kernel you are running. If
658 unsure, say N.
659
660config MODULE_SRCVERSION_ALL
661 bool "Source checksum for all modules"
662 depends on MODULES
663 help
664 Modules which contain a MODULE_VERSION get an extra "srcversion"
665 field inserted into their modinfo section, which contains a
666 sum of the source files which made it. This helps maintainers
667 see exactly which source was used to build a module (since
668 others sometimes change the module source without updating
669 the version). With this option, such a "srcversion" field
670 will be created for all modules. If unsure, say N.
671
672config KMOD
673 bool "Automatic kernel module loading"
674 depends on MODULES
675 help
676 Normally when you have selected some parts of the kernel to
677 be created as kernel modules, you must load them (using the
678 "modprobe" command) before you can use them. If you say Y
679 here, some parts of the kernel will be able to load modules
680 automatically: when a part of the kernel needs a module, it
681 runs modprobe with the appropriate arguments, thereby
682 loading the module if it is available. If unsure, say Y.
683
684config STOP_MACHINE
685 bool
686 default y
687 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
688 help
689 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100690
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100691source "block/Kconfig"