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Linus Torvalds1da177e2005-04-16 15:20:36 -07001menu "Code maturity level options"
2
3config EXPERIMENTAL
4 bool "Prompt for development and/or incomplete code/drivers"
5 ---help---
6 Some of the various things that Linux supports (such as network
7 drivers, file systems, network protocols, etc.) can be in a state
8 of development where the functionality, stability, or the level of
9 testing is not yet high enough for general use. This is usually
10 known as the "alpha-test" phase among developers. If a feature is
11 currently in alpha-test, then the developers usually discourage
12 uninformed widespread use of this feature by the general public to
13 avoid "Why doesn't this work?" type mail messages. However, active
14 testing and use of these systems is welcomed. Just be aware that it
15 may not meet the normal level of reliability or it may fail to work
16 in some special cases. Detailed bug reports from people familiar
17 with the kernel internals are usually welcomed by the developers
18 (before submitting bug reports, please read the documents
19 <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
20 <file:Documentation/BUG-HUNTING>, and
21 <file:Documentation/oops-tracing.txt> in the kernel source).
22
23 This option will also make obsoleted drivers available. These are
24 drivers that have been replaced by something else, and/or are
25 scheduled to be removed in a future kernel release.
26
27 Unless you intend to help test and develop a feature or driver that
28 falls into this category, or you have a situation that requires
29 using these features, you should probably say N here, which will
30 cause the configurator to present you with fewer choices. If
31 you say Y here, you will be offered the choice of using features or
32 drivers that are currently considered to be in the alpha-test phase.
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034config BROKEN
35 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37config BROKEN_ON_SMP
38 bool
39 depends on BROKEN || !SMP
40 default y
41
42config LOCK_KERNEL
43 bool
44 depends on SMP || PREEMPT
45 default y
46
47config INIT_ENV_ARG_LIMIT
48 int
49 default 32 if !USERMODE
50 default 128 if USERMODE
51 help
Randy Dunlap34ad92c2005-10-30 15:01:46 -080052 Maximum of each of the number of arguments and environment
53 variables passed to init from the kernel command line.
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55endmenu
56
57menu "General setup"
58
59config LOCALVERSION
60 string "Local version - append to kernel release"
61 help
62 Append an extra string to the end of your kernel version.
63 This will show up when you type uname, for example.
64 The string you set here will be appended after the contents of
65 any files with a filename matching localversion* in your
66 object and source tree, in that order. Your total string can
67 be a maximum of 64 characters.
68
Ryan Andersonaaebf432005-07-31 04:57:49 -040069config LOCALVERSION_AUTO
70 bool "Automatically append version information to the version string"
71 default y
72 help
73 This will try to automatically determine if the current tree is a
74 release tree by looking for git tags that
75 belong to the current top of tree revision.
76
77 A string of the format -gxxxxxxxx will be added to the localversion
78 if a git based tree is found. The string generated by this will be
79 appended after any matching localversion* files, and after the value
80 set in CONFIG_LOCALVERSION
81
82 Note: This requires Perl, and a git repository, but not necessarily
83 the git or cogito tools to be installed.
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085config SWAP
86 bool "Support for paging of anonymous memory (swap)"
87 depends on MMU
88 default y
89 help
90 This option allows you to choose whether you want to have support
Jesper Juhl92c35042006-01-15 02:40:08 +010091 for so called swap devices or swap files in your kernel that are
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 used to provide more virtual memory than the actual RAM present
93 in your computer. If unsure say Y.
94
95config SYSVIPC
96 bool "System V IPC"
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 ---help---
98 Inter Process Communication is a suite of library functions and
99 system calls which let processes (running programs) synchronize and
100 exchange information. It is generally considered to be a good thing,
101 and some programs won't run unless you say Y here. In particular, if
102 you want to run the DOS emulator dosemu under Linux (read the
103 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
104 you'll need to say Y here.
105
106 You can find documentation about IPC with "info ipc" and also in
107 section 6.4 of the Linux Programmer's Guide, available from
108 <http://www.tldp.org/guides.html>.
109
110config POSIX_MQUEUE
111 bool "POSIX Message Queues"
112 depends on NET && EXPERIMENTAL
113 ---help---
114 POSIX variant of message queues is a part of IPC. In POSIX message
115 queues every message has a priority which decides about succession
116 of receiving it by a process. If you want to compile and run
117 programs written e.g. for Solaris with use of its POSIX message
118 queues (functions mq_*) say Y here. To use this feature you will
119 also need mqueue library, available from
120 <http://www.mat.uni.torun.pl/~wrona/posix_ipc/>
121
122 POSIX message queues are visible as a filesystem called 'mqueue'
123 and can be mounted somewhere if you want to do filesystem
124 operations on message queues.
125
126 If unsure, say Y.
127
128config BSD_PROCESS_ACCT
129 bool "BSD Process Accounting"
130 help
131 If you say Y here, a user level program will be able to instruct the
132 kernel (via a special system call) to write process accounting
133 information to a file: whenever a process exits, information about
134 that process will be appended to the file by the kernel. The
135 information includes things such as creation time, owning user,
136 command name, memory usage, controlling terminal etc. (the complete
137 list is in the struct acct in <file:include/linux/acct.h>). It is
138 up to the user level program to do useful things with this
139 information. This is generally a good idea, so say Y.
140
141config BSD_PROCESS_ACCT_V3
142 bool "BSD Process Accounting version 3 file format"
143 depends on BSD_PROCESS_ACCT
144 default n
145 help
146 If you say Y here, the process accounting information is written
147 in a new file format that also logs the process IDs of each
148 process and it's parent. Note that this file format is incompatible
149 with previous v0/v1/v2 file formats, so you will need updated tools
150 for processing it. A preliminary version of these tools is available
151 at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
152
153config SYSCTL
154 bool "Sysctl support"
155 ---help---
156 The sysctl interface provides a means of dynamically changing
157 certain kernel parameters and variables on the fly without requiring
158 a recompile of the kernel or reboot of the system. The primary
159 interface consists of a system call, but if you say Y to "/proc
160 file system support", a tree of modifiable sysctl entries will be
161 generated beneath the /proc/sys directory. They are explained in the
162 files in <file:Documentation/sysctl/>. Note that enabling this
163 option will enlarge the kernel by at least 8 KB.
164
165 As it is generally a good thing, you should say Y here unless
166 building a kernel for install/rescue disks or your system is very
167 limited in memory.
168
169config AUDIT
170 bool "Auditing support"
Chris Wright804a6a42005-05-11 10:52:45 +0100171 depends on NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 help
173 Enable auditing infrastructure that can be used with another
174 kernel subsystem, such as SELinux (which requires this for
175 logging of avc messages output). Does not do system-call
176 auditing without CONFIG_AUDITSYSCALL.
177
178config AUDITSYSCALL
179 bool "Enable system-call auditing support"
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800180 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 default y if SECURITY_SELINUX
182 help
183 Enable low-overhead system-call auditing infrastructure that
184 can be used independently or with another kernel subsystem,
185 such as SELinux.
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187config IKCONFIG
188 bool "Kernel .config support"
189 ---help---
190 This option enables the complete Linux kernel ".config" file
191 contents to be saved in the kernel. It provides documentation
192 of which kernel options are used in a running kernel or in an
193 on-disk kernel. This information can be extracted from the kernel
194 image file with the script scripts/extract-ikconfig and used as
195 input to rebuild the current kernel or to build another kernel.
196 It can also be extracted from a running kernel by reading
197 /proc/config.gz if enabled (below).
198
199config IKCONFIG_PROC
200 bool "Enable access to .config through /proc/config.gz"
201 depends on IKCONFIG && PROC_FS
202 ---help---
203 This option enables access to the kernel configuration file
204 through /proc/config.gz.
205
206config CPUSETS
207 bool "Cpuset support"
208 depends on SMP
209 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700210 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 allow dynamically partitioning a system into sets of CPUs and
212 Memory Nodes and assigning tasks to run only within those sets.
213 This is primarily useful on large SMP or NUMA systems.
214
215 Say N if unsure.
216
Jens Axboeb86ff982006-03-23 19:56:55 +0100217config RELAY
218 bool "Kernel->user space relay support (formerly relayfs)"
219 help
220 This option enables support for relay interface support in
221 certain file systems (such as debugfs).
222 It is designed to provide an efficient mechanism for tools and
223 facilities to relay large amounts of data from kernel space to
224 user space.
225
226 If unsure, say N.
227
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200228source "usr/Kconfig"
229
Matt Mackalle585e472006-01-08 01:05:24 -0800230config UID16
231 bool "Enable 16-bit UID system calls" if EMBEDDED
Adrian Bunk2308acc2006-01-09 20:51:26 -0800232 depends on ARM || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION)
Matt Mackalle585e472006-01-08 01:05:24 -0800233 default y
234 help
235 This enables the legacy 16-bit UID syscall wrappers.
236
Matt Mackall64ca9002006-01-08 01:05:26 -0800237config VM86
238 depends X86
239 default y
240 bool "Enable VM86 support" if EMBEDDED
241 help
242 This option is required by programs like DOSEMU to run 16-bit legacy
243 code on X86 processors. It also may be needed by software like
244 XFree86 to initialize some video cards via BIOS. Disabling this
245 option saves about 6k.
246
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800247config CC_OPTIMIZE_FOR_SIZE
248 bool "Optimize for size (Look out for broken compilers!)"
249 default y
250 depends on ARM || H8300 || EXPERIMENTAL
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800251 help
252 Enabling this option will pass "-Os" instead of "-O2" to gcc
253 resulting in a smaller kernel.
254
255 WARNING: some versions of gcc may generate incorrect code with this
256 option. If problems are observed, a gcc upgrade may be needed.
257
258 If unsure, say N.
259
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260menuconfig EMBEDDED
261 bool "Configure standard kernel features (for small systems)"
262 help
263 This option allows certain base kernel options and settings
264 to be disabled or tweaked. This is for specialized
265 environments which can tolerate a "non-standard" kernel.
266 Only use this if you really know what you are doing.
267
268config KALLSYMS
269 bool "Load all symbols for debugging/kksymoops" if EMBEDDED
270 default y
271 help
272 Say Y here to let the kernel print out symbolic crash information and
273 symbolic stack backtraces. This increases the size of the kernel
274 somewhat, as all symbols have to be loaded into the kernel image.
275
276config KALLSYMS_ALL
277 bool "Include all symbols in kallsyms"
278 depends on DEBUG_KERNEL && KALLSYMS
279 help
280 Normally kallsyms only contains the symbols of functions, for nicer
281 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200282 symbols too: say Y here to include all symbols, if you need them
283 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285 Say N.
286
287config KALLSYMS_EXTRA_PASS
288 bool "Do an extra kallsyms pass"
289 depends on KALLSYMS
290 help
291 If kallsyms is not working correctly, the build will fail with
292 inconsistent kallsyms data. If that occurs, log a bug report and
293 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
294 Always say N here unless you find a bug in kallsyms, which must be
295 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
296 you wait for kallsyms to be fixed.
297
Matt Mackalld59745c2005-05-01 08:59:02 -0700298
Greg Kroah-Hartman712f47c2005-11-16 11:27:07 -0800299config HOTPLUG
300 bool "Support for hot-pluggable devices" if EMBEDDED
301 default y
302 help
303 This option is provided for the case where no hotplug or uevent
304 capabilities is wanted by the kernel. You should only consider
305 disabling this option for embedded systems that do not use modules, a
306 dynamic /dev tree, or dynamic device discovery. Just say Y.
307
Matt Mackalld59745c2005-05-01 08:59:02 -0700308config PRINTK
309 default y
310 bool "Enable support for printk" if EMBEDDED
311 help
312 This option enables normal printk support. Removing it
313 eliminates most of the message strings from the kernel image
314 and makes the kernel more or less silent. As this makes it
315 very difficult to diagnose system problems, saying N here is
316 strongly discouraged.
317
Matt Mackallc8538a72005-05-01 08:59:01 -0700318config BUG
319 bool "BUG() support" if EMBEDDED
320 default y
321 help
322 Disabling this option eliminates support for BUG and WARN, reducing
323 the size of your kernel image and potentially quietly ignoring
324 numerous fatal conditions. You should only consider disabling this
325 option for embedded systems with no facilities for reporting errors.
326 Just say Y.
327
Matt Mackall708e9a72006-01-08 01:05:25 -0800328config ELF_CORE
329 default y
330 bool "Enable ELF core dumps" if EMBEDDED
331 help
332 Enable support for generating core dumps. Disabling saves about 4k.
333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334config BASE_FULL
335 default y
336 bool "Enable full-sized data structures for core" if EMBEDDED
337 help
338 Disabling this option reduces the size of miscellaneous core
339 kernel data structures. This saves memory on small machines,
340 but may reduce performance.
341
342config FUTEX
343 bool "Enable futex support" if EMBEDDED
344 default y
345 help
346 Disabling this option will cause the kernel to be built without
347 support for "fast userspace mutexes". The resulting kernel may not
348 run glibc-based applications correctly.
349
350config EPOLL
351 bool "Enable eventpoll support" if EMBEDDED
352 default y
353 help
354 Disabling this option will cause the kernel to be built without
355 support for epoll family of system calls.
356
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357config SHMEM
358 bool "Use full shmem filesystem" if EMBEDDED
359 default y
360 depends on MMU
361 help
362 The shmem is an internal filesystem used to manage shared memory.
363 It is backed by swap and manages resource limits. It is also exported
364 to userspace as tmpfs if TMPFS is enabled. Disabling this
365 option replaces shmem and tmpfs with the much simpler ramfs code,
366 which may be appropriate on small systems without swap.
367
368config CC_ALIGN_FUNCTIONS
369 int "Function alignment" if EMBEDDED
370 default 0
371 help
372 Align the start of functions to the next power-of-two greater than n,
373 skipping up to n bytes. For instance, 32 aligns functions
374 to the next 32-byte boundary, but 24 would align to the next
375 32-byte boundary only if this can be done by skipping 23 bytes or less.
376 Zero means use compiler's default.
377
378config CC_ALIGN_LABELS
379 int "Label alignment" if EMBEDDED
380 default 0
381 help
382 Align all branch targets to a power-of-two boundary, skipping
383 up to n bytes like ALIGN_FUNCTIONS. This option can easily
384 make code slower, because it must insert dummy operations for
385 when the branch target is reached in the usual flow of the code.
386 Zero means use compiler's default.
387
388config CC_ALIGN_LOOPS
389 int "Loop alignment" if EMBEDDED
390 default 0
391 help
392 Align loops to a power-of-two boundary, skipping up to n bytes.
393 Zero means use compiler's default.
394
395config CC_ALIGN_JUMPS
396 int "Jump alignment" if EMBEDDED
397 default 0
398 help
399 Align branch targets to a power-of-two boundary, for branch
400 targets where the targets can only be reached by jumping,
401 skipping up to n bytes like ALIGN_FUNCTIONS. In this case,
402 no dummy operations need be executed.
403 Zero means use compiler's default.
404
Matt Mackall10cef602006-01-08 01:01:45 -0800405config SLAB
406 default y
407 bool "Use full SLAB allocator" if EMBEDDED
408 help
409 Disabling this replaces the advanced SLAB allocator and
410 kmalloc support with the drastically simpler SLOB allocator.
411 SLOB is more space efficient but does not scale well and is
412 more susceptible to fragmentation.
413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414endmenu # General setup
415
416config TINY_SHMEM
417 default !SHMEM
418 bool
419
420config BASE_SMALL
421 int
422 default 0 if BASE_FULL
423 default 1 if !BASE_FULL
424
Matt Mackall10cef602006-01-08 01:01:45 -0800425config SLOB
426 default !SLAB
427 bool
428
Adrian Bunkfd279192006-01-16 22:13:59 -0800429config OBSOLETE_INTERMODULE
430 tristate
431
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432menu "Loadable module support"
433
434config MODULES
435 bool "Enable loadable module support"
436 help
437 Kernel modules are small pieces of compiled code which can
438 be inserted in the running kernel, rather than being
439 permanently built into the kernel. You use the "modprobe"
440 tool to add (and sometimes remove) them. If you say Y here,
441 many parts of the kernel can be built as modules (by
442 answering M instead of Y where indicated): this is most
443 useful for infrequently used options which are not required
444 for booting. For more information, see the man pages for
445 modprobe, lsmod, modinfo, insmod and rmmod.
446
447 If you say Y here, you will need to run "make
448 modules_install" to put the modules under /lib/modules/
449 where modprobe can find them (you may need to be root to do
450 this).
451
452 If unsure, say Y.
453
454config MODULE_UNLOAD
455 bool "Module unloading"
456 depends on MODULES
457 help
458 Without this option you will not be able to unload any
459 modules (note that some modules may not be unloadable
460 anyway), which makes your kernel slightly smaller and
461 simpler. If unsure, say Y.
462
463config MODULE_FORCE_UNLOAD
464 bool "Forced module unloading"
465 depends on MODULE_UNLOAD && EXPERIMENTAL
466 help
467 This option allows you to force a module to unload, even if the
468 kernel believes it is unsafe: the kernel will remove the module
469 without waiting for anyone to stop using it (using the -f option to
470 rmmod). This is mainly for kernel developers and desperate users.
471 If unsure, say N.
472
473config OBSOLETE_MODPARM
474 bool
475 default y
476 depends on MODULES
477 help
478 You need this option to use module parameters on modules which
479 have not been converted to the new module parameter system yet.
480 If unsure, say Y.
481
482config MODVERSIONS
Sam Ravnborg0d541642005-12-26 23:04:02 +0100483 bool "Module versioning support"
484 depends on MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 help
486 Usually, you have to use modules compiled with your kernel.
487 Saying Y here makes it sometimes possible to use modules
488 compiled for different kernels, by adding enough information
489 to the modules to (hopefully) spot any changes which would
490 make them incompatible with the kernel you are running. If
491 unsure, say N.
492
493config MODULE_SRCVERSION_ALL
494 bool "Source checksum for all modules"
495 depends on MODULES
496 help
497 Modules which contain a MODULE_VERSION get an extra "srcversion"
498 field inserted into their modinfo section, which contains a
499 sum of the source files which made it. This helps maintainers
500 see exactly which source was used to build a module (since
501 others sometimes change the module source without updating
502 the version). With this option, such a "srcversion" field
503 will be created for all modules. If unsure, say N.
504
505config KMOD
506 bool "Automatic kernel module loading"
507 depends on MODULES
508 help
509 Normally when you have selected some parts of the kernel to
510 be created as kernel modules, you must load them (using the
511 "modprobe" command) before you can use them. If you say Y
512 here, some parts of the kernel will be able to load modules
513 automatically: when a part of the kernel needs a module, it
514 runs modprobe with the appropriate arguments, thereby
515 loading the module if it is available. If unsure, say Y.
516
517config STOP_MACHINE
518 bool
519 default y
520 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
521 help
522 Need stop_machine() primitive.
523endmenu
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100524
525menu "Block layer"
526source "block/Kconfig"
527endmenu