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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33 drivers that have been replaced by something else, and/or are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
Paul Menageddbcc7e2007-10-18 23:39:30 -0700273config CGROUPS
274 bool "Control Group support"
275 help
276 This option will let you use process cgroup subsystems
277 such as Cpusets
278
279 Say N if unsure.
280
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281config CPUSETS
282 bool "Cpuset support"
283 depends on SMP
284 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700285 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 allow dynamically partitioning a system into sets of CPUs and
287 Memory Nodes and assigning tasks to run only within those sets.
288 This is primarily useful on large SMP or NUMA systems.
289
290 Say N if unsure.
291
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200292config FAIR_GROUP_SCHED
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200293 bool "Fair group CPU scheduler"
Ingo Molnarde8d5852007-10-15 17:00:09 +0200294 default y
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +0200295 depends on EXPERIMENTAL
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200296 help
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200297 This feature lets CPU scheduler recognize task groups and control CPU
Srivatsa Vaddagiri9b5b7752007-10-15 17:00:09 +0200298 bandwidth allocation to such task groups.
Srivatsa Vaddagiri29f59db2007-10-15 17:00:07 +0200299
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200300choice
301 depends on FAIR_GROUP_SCHED
302 prompt "Basis for grouping tasks"
303 default FAIR_USER_SCHED
304
Srivatsa Vaddagirifb615582007-10-15 17:00:12 +0200305config FAIR_USER_SCHED
306 bool "user id"
307 help
308 This option will choose userid as the basis for grouping
309 tasks, thus providing equal CPU bandwidth to each user.
Srivatsa Vaddagiri24e377a2007-10-15 17:00:09 +0200310
311endchoice
312
Kay Sievers88a22c92006-09-14 11:23:28 +0200313config SYSFS_DEPRECATED
314 bool "Create deprecated sysfs files"
315 default y
316 help
317 This option creates deprecated symlinks such as the
318 "device"-link, the <subsystem>:<name>-link, and the
319 "bus"-link. It may also add deprecated key in the
320 uevent environment.
321 None of these features or values should be used today, as
322 they export driver core implementation details to userspace
323 or export properties which can't be kept stable across kernel
324 releases.
325
326 If enabled, this option will also move any device structures
David Sterba3dde6ad2007-05-09 07:12:20 +0200327 that belong to a class, back into the /sys/class hierarchy, in
Kay Sievers88a22c92006-09-14 11:23:28 +0200328 order to support older versions of udev.
329
330 If you are using a distro that was released in 2006 or later,
331 it should be safe to say N here.
332
Jens Axboeb86ff9812006-03-23 19:56:55 +0100333config RELAY
334 bool "Kernel->user space relay support (formerly relayfs)"
335 help
336 This option enables support for relay interface support in
337 certain file systems (such as debugfs).
338 It is designed to provide an efficient mechanism for tools and
339 facilities to relay large amounts of data from kernel space to
340 user space.
341
342 If unsure, say N.
343
Dimitri Gorokhovikf9916332007-03-06 01:42:17 -0800344config BLK_DEV_INITRD
345 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
346 depends on BROKEN || !FRV
347 help
348 The initial RAM filesystem is a ramfs which is loaded by the
349 boot loader (loadlin or lilo) and that is mounted as root
350 before the normal boot procedure. It is typically used to
351 load modules needed to mount the "real" root file system,
352 etc. See <file:Documentation/initrd.txt> for details.
353
354 If RAM disk support (BLK_DEV_RAM) is also included, this
355 also enables initial RAM disk (initrd) support and adds
356 15 Kbytes (more on some other architectures) to the kernel size.
357
358 If unsure say Y.
359
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800360if BLK_DEV_INITRD
361
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200362source "usr/Kconfig"
363
Jean-Paul Samanc33df4e2007-02-10 01:44:43 -0800364endif
365
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800366config CC_OPTIMIZE_FOR_SIZE
367 bool "Optimize for size (Look out for broken compilers!)"
368 default y
Paul Mundt32582fa2007-07-25 11:27:05 +0900369 depends on ARM || H8300 || SUPERH || EXPERIMENTAL
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800370 help
371 Enabling this option will pass "-Os" instead of "-O2" to gcc
372 resulting in a smaller kernel.
373
374 WARNING: some versions of gcc may generate incorrect code with this
375 option. If problems are observed, a gcc upgrade may be needed.
376
377 If unsure, say N.
378
Randy Dunlap08470622006-09-30 23:28:13 -0700379config SYSCTL
380 bool
381
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382menuconfig EMBEDDED
383 bool "Configure standard kernel features (for small systems)"
384 help
385 This option allows certain base kernel options and settings
386 to be disabled or tweaked. This is for specialized
387 environments which can tolerate a "non-standard" kernel.
388 Only use this if you really know what you are doing.
389
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700390config UID16
391 bool "Enable 16-bit UID system calls" if EMBEDDED
Bryan Wu1394f032007-05-06 14:50:22 -0700392 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 -0700393 default y
394 help
395 This enables the legacy 16-bit UID syscall wrappers.
396
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700397config SYSCTL_SYSCALL
Randy Dunlap08470622006-09-30 23:28:13 -0700398 bool "Sysctl syscall support" if EMBEDDED
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800399 default y
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700400 select SYSCTL
401 ---help---
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800402 sys_sysctl uses binary paths that have been found challenging
403 to properly maintain and use. The interface in /proc/sys
404 using paths with ascii names is now the primary path to this
405 information.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700406
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800407 Almost nothing using the binary sysctl interface so if you are
408 trying to save some space it is probably safe to disable this,
409 making your kernel marginally smaller.
Eric W. Biedermanb89a8172006-09-27 01:51:04 -0700410
Eric W. Biederman13bb7e32006-11-08 17:44:51 -0800411 If unsure say Y here.
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413config KALLSYMS
Jesper Juhl979c6a12006-12-12 19:25:11 +0100414 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 default y
416 help
417 Say Y here to let the kernel print out symbolic crash information and
418 symbolic stack backtraces. This increases the size of the kernel
419 somewhat, as all symbols have to be loaded into the kernel image.
420
421config KALLSYMS_ALL
422 bool "Include all symbols in kallsyms"
423 depends on DEBUG_KERNEL && KALLSYMS
424 help
425 Normally kallsyms only contains the symbols of functions, for nicer
426 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200427 symbols too: say Y here to include all symbols, if you need them
428 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
430 Say N.
431
432config KALLSYMS_EXTRA_PASS
433 bool "Do an extra kallsyms pass"
434 depends on KALLSYMS
435 help
436 If kallsyms is not working correctly, the build will fail with
437 inconsistent kallsyms data. If that occurs, log a bug report and
438 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
439 Always say N here unless you find a bug in kallsyms, which must be
440 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
441 you wait for kallsyms to be fixed.
442
Matt Mackalld59745c2005-05-01 08:59:02 -0700443
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800444config HOTPLUG
445 bool "Support for hot-pluggable devices" if EMBEDDED
446 default y
447 help
448 This option is provided for the case where no hotplug or uevent
449 capabilities is wanted by the kernel. You should only consider
450 disabling this option for embedded systems that do not use modules, a
451 dynamic /dev tree, or dynamic device discovery. Just say Y.
452
Matt Mackalld59745c2005-05-01 08:59:02 -0700453config PRINTK
454 default y
455 bool "Enable support for printk" if EMBEDDED
456 help
457 This option enables normal printk support. Removing it
458 eliminates most of the message strings from the kernel image
459 and makes the kernel more or less silent. As this makes it
460 very difficult to diagnose system problems, saying N here is
461 strongly discouraged.
462
Matt Mackallc8538a72005-05-01 08:59:01 -0700463config BUG
464 bool "BUG() support" if EMBEDDED
465 default y
466 help
467 Disabling this option eliminates support for BUG and WARN, reducing
468 the size of your kernel image and potentially quietly ignoring
469 numerous fatal conditions. You should only consider disabling this
470 option for embedded systems with no facilities for reporting errors.
471 Just say Y.
472
Matt Mackall708e9a72006-01-08 01:05:25 -0800473config ELF_CORE
474 default y
475 bool "Enable ELF core dumps" if EMBEDDED
476 help
477 Enable support for generating core dumps. Disabling saves about 4k.
478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479config BASE_FULL
480 default y
481 bool "Enable full-sized data structures for core" if EMBEDDED
482 help
483 Disabling this option reduces the size of miscellaneous core
484 kernel data structures. This saves memory on small machines,
485 but may reduce performance.
486
487config FUTEX
488 bool "Enable futex support" if EMBEDDED
489 default y
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700490 select RT_MUTEXES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 help
492 Disabling this option will cause the kernel to be built without
493 support for "fast userspace mutexes". The resulting kernel may not
494 run glibc-based applications correctly.
495
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700496config ANON_INODES
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700497 bool
Davide Libenzi5dc8bf82007-05-10 22:23:11 -0700498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499config EPOLL
500 bool "Enable eventpoll support" if EMBEDDED
501 default y
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700502 select ANON_INODES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 help
504 Disabling this option will cause the kernel to be built without
505 support for epoll family of system calls.
506
Davide Libenzifba2afa2007-05-10 22:23:13 -0700507config SIGNALFD
508 bool "Enable signalfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700509 select ANON_INODES
Davide Libenzifba2afa2007-05-10 22:23:13 -0700510 default y
511 help
512 Enable the signalfd() system call that allows to receive signals
513 on a file descriptor.
514
515 If unsure, say Y.
516
Davide Libenzib215e282007-05-10 22:23:16 -0700517config TIMERFD
518 bool "Enable timerfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700519 select ANON_INODES
Andrew Mortone4260192007-09-18 22:46:41 -0700520 depends on BROKEN
Davide Libenzib215e282007-05-10 22:23:16 -0700521 default y
522 help
523 Enable the timerfd() system call that allows to receive timer
524 events on a file descriptor.
525
526 If unsure, say Y.
527
Davide Libenzie1ad7462007-05-10 22:23:19 -0700528config EVENTFD
529 bool "Enable eventfd() system call" if EMBEDDED
Adrian Bunk448e3ce2007-07-31 00:39:10 -0700530 select ANON_INODES
Davide Libenzie1ad7462007-05-10 22:23:19 -0700531 default y
532 help
533 Enable the eventfd() system call that allows to receive both
534 kernel notification (ie. KAIO) or userspace notifications.
535
536 If unsure, say Y.
537
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538config SHMEM
539 bool "Use full shmem filesystem" if EMBEDDED
540 default y
541 depends on MMU
542 help
543 The shmem is an internal filesystem used to manage shared memory.
544 It is backed by swap and manages resource limits. It is also exported
545 to userspace as tmpfs if TMPFS is enabled. Disabling this
546 option replaces shmem and tmpfs with the much simpler ramfs code,
547 which may be appropriate on small systems without swap.
548
Christoph Lameterf8891e52006-06-30 01:55:45 -0700549config VM_EVENT_COUNTERS
550 default y
551 bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
552 help
Paul Jackson2aea4fb2006-12-22 01:06:10 -0800553 VM event counters are needed for event counts to be shown.
554 This option allows the disabling of the VM event counters
555 on EMBEDDED systems. /proc/vmstat will only show page counts
556 if VM event counters are disabled.
Christoph Lameterf8891e52006-06-30 01:55:45 -0700557
Christoph Lameter41ecc552007-05-09 02:32:44 -0700558config SLUB_DEBUG
559 default y
560 bool "Enable SLUB debugging support" if EMBEDDED
Christoph Lameterd4751a22007-05-10 03:15:40 -0700561 depends on SLUB
Christoph Lameter41ecc552007-05-09 02:32:44 -0700562 help
563 SLUB has extensive debug support features. Disabling these can
564 result in significant savings in code size. This also disables
565 SLUB sysfs support. /sys/slab will not exist and there will be
566 no support for cache validation etc.
567
Christoph Lameter81819f02007-05-06 14:49:36 -0700568choice
569 prompt "Choose SLAB allocator"
Christoph Lametera0acd822007-07-17 04:03:32 -0700570 default SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700571 help
572 This option allows to select a slab allocator.
573
574config SLAB
575 bool "SLAB"
576 help
577 The regular slab allocator that is established and known to work
Christoph Lameter34013882007-05-09 02:32:47 -0700578 well in all environments. It organizes cache hot objects in
Christoph Lameter81819f02007-05-06 14:49:36 -0700579 per cpu and per node queues. SLAB is the default choice for
Christoph Lameter34013882007-05-09 02:32:47 -0700580 a slab allocator.
Christoph Lameter81819f02007-05-06 14:49:36 -0700581
582config SLUB
Christoph Lameter81819f02007-05-06 14:49:36 -0700583 bool "SLUB (Unqueued Allocator)"
584 help
585 SLUB is a slab allocator that minimizes cache line usage
586 instead of managing queues of cached objects (SLAB approach).
587 Per cpu caching is realized using slabs of objects instead
588 of queues of objects. SLUB can use memory efficiently
Christoph Lameter34013882007-05-09 02:32:47 -0700589 and has enhanced diagnostics.
Christoph Lameter81819f02007-05-06 14:49:36 -0700590
591config SLOB
Paul Mundt84a01c22007-07-15 23:38:24 -0700592 depends on EMBEDDED
Christoph Lameter81819f02007-05-06 14:49:36 -0700593 bool "SLOB (Simple Allocator)"
594 help
595 SLOB replaces the SLAB allocator with a drastically simpler
Nick Pigginafc0ced2007-05-16 22:10:49 -0700596 allocator. SLOB is more space efficient than SLAB but does not
Christoph Lameter34013882007-05-09 02:32:47 -0700597 scale well (single lock for all operations) and is also highly
598 susceptible to fragmentation. SLUB can accomplish a higher object
599 density. It is usually better to use SLUB instead of SLOB.
Christoph Lameter81819f02007-05-06 14:49:36 -0700600
601endchoice
602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603endmenu # General setup
604
Chuck Ebbertae81f9e2006-09-16 12:15:53 -0700605config RT_MUTEXES
606 boolean
607 select PLIST
608
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609config TINY_SHMEM
610 default !SHMEM
611 bool
612
613config BASE_SMALL
614 int
615 default 0 if BASE_FULL
616 default 1 if !BASE_FULL
617
Jan Engelhardt66da5732007-07-15 23:39:29 -0700618menuconfig MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 bool "Enable loadable module support"
620 help
621 Kernel modules are small pieces of compiled code which can
622 be inserted in the running kernel, rather than being
623 permanently built into the kernel. You use the "modprobe"
624 tool to add (and sometimes remove) them. If you say Y here,
625 many parts of the kernel can be built as modules (by
626 answering M instead of Y where indicated): this is most
627 useful for infrequently used options which are not required
628 for booting. For more information, see the man pages for
629 modprobe, lsmod, modinfo, insmod and rmmod.
630
631 If you say Y here, you will need to run "make
632 modules_install" to put the modules under /lib/modules/
633 where modprobe can find them (you may need to be root to do
634 this).
635
636 If unsure, say Y.
637
638config MODULE_UNLOAD
639 bool "Module unloading"
640 depends on MODULES
641 help
642 Without this option you will not be able to unload any
643 modules (note that some modules may not be unloadable
644 anyway), which makes your kernel slightly smaller and
645 simpler. If unsure, say Y.
646
647config MODULE_FORCE_UNLOAD
648 bool "Forced module unloading"
649 depends on MODULE_UNLOAD && EXPERIMENTAL
650 help
651 This option allows you to force a module to unload, even if the
652 kernel believes it is unsafe: the kernel will remove the module
653 without waiting for anyone to stop using it (using the -f option to
654 rmmod). This is mainly for kernel developers and desperate users.
655 If unsure, say N.
656
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100658 bool "Module versioning support"
659 depends on MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 help
661 Usually, you have to use modules compiled with your kernel.
662 Saying Y here makes it sometimes possible to use modules
663 compiled for different kernels, by adding enough information
664 to the modules to (hopefully) spot any changes which would
665 make them incompatible with the kernel you are running. If
666 unsure, say N.
667
668config MODULE_SRCVERSION_ALL
669 bool "Source checksum for all modules"
670 depends on MODULES
671 help
672 Modules which contain a MODULE_VERSION get an extra "srcversion"
673 field inserted into their modinfo section, which contains a
674 sum of the source files which made it. This helps maintainers
675 see exactly which source was used to build a module (since
676 others sometimes change the module source without updating
677 the version). With this option, such a "srcversion" field
678 will be created for all modules. If unsure, say N.
679
680config KMOD
681 bool "Automatic kernel module loading"
682 depends on MODULES
683 help
684 Normally when you have selected some parts of the kernel to
685 be created as kernel modules, you must load them (using the
686 "modprobe" command) before you can use them. If you say Y
687 here, some parts of the kernel will be able to load modules
688 automatically: when a part of the kernel needs a module, it
689 runs modprobe with the appropriate arguments, thereby
690 loading the module if it is available. If unsure, say Y.
691
692config STOP_MACHINE
693 bool
694 default y
695 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
696 help
697 Need stop_machine() primitive.
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100698
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100699source "block/Kconfig"
Avi Kivitye98c3202007-10-16 23:27:31 -0700700
701config PREEMPT_NOTIFIERS
702 bool