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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24 drivers that have been replaced by something else, and/or are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
34config CLEAN_COMPILE
35 bool "Select only drivers expected to compile cleanly" if EXPERIMENTAL
36 default y
37 help
38 Select this option if you don't even want to see the option
39 to configure known-broken drivers.
40
41 If unsure, say Y
42
43config BROKEN
44 bool
45 depends on !CLEAN_COMPILE
46 default y
47
48config BROKEN_ON_SMP
49 bool
50 depends on BROKEN || !SMP
51 default y
52
53config LOCK_KERNEL
54 bool
55 depends on SMP || PREEMPT
56 default y
57
58config INIT_ENV_ARG_LIMIT
59 int
60 default 32 if !USERMODE
61 default 128 if USERMODE
62 help
Randy Dunlap34ad92c2005-10-30 15:01:46 -080063 Maximum of each of the number of arguments and environment
64 variables passed to init from the kernel command line.
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66endmenu
67
68menu "General setup"
69
70config LOCALVERSION
71 string "Local version - append to kernel release"
72 help
73 Append an extra string to the end of your kernel version.
74 This will show up when you type uname, for example.
75 The string you set here will be appended after the contents of
76 any files with a filename matching localversion* in your
77 object and source tree, in that order. Your total string can
78 be a maximum of 64 characters.
79
Ryan Andersonaaebf432005-07-31 04:57:49 -040080config LOCALVERSION_AUTO
81 bool "Automatically append version information to the version string"
82 default y
83 help
84 This will try to automatically determine if the current tree is a
85 release tree by looking for git tags that
86 belong to the current top of tree revision.
87
88 A string of the format -gxxxxxxxx will be added to the localversion
89 if a git based tree is found. The string generated by this will be
90 appended after any matching localversion* files, and after the value
91 set in CONFIG_LOCALVERSION
92
93 Note: This requires Perl, and a git repository, but not necessarily
94 the git or cogito tools to be installed.
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096config SWAP
97 bool "Support for paging of anonymous memory (swap)"
98 depends on MMU
99 default y
100 help
101 This option allows you to choose whether you want to have support
102 for socalled swap devices or swap files in your kernel that are
103 used to provide more virtual memory than the actual RAM present
104 in your computer. If unsure say Y.
105
106config SYSVIPC
107 bool "System V IPC"
108 depends on MMU
109 ---help---
110 Inter Process Communication is a suite of library functions and
111 system calls which let processes (running programs) synchronize and
112 exchange information. It is generally considered to be a good thing,
113 and some programs won't run unless you say Y here. In particular, if
114 you want to run the DOS emulator dosemu under Linux (read the
115 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
116 you'll need to say Y here.
117
118 You can find documentation about IPC with "info ipc" and also in
119 section 6.4 of the Linux Programmer's Guide, available from
120 <http://www.tldp.org/guides.html>.
121
122config POSIX_MQUEUE
123 bool "POSIX Message Queues"
124 depends on NET && EXPERIMENTAL
125 ---help---
126 POSIX variant of message queues is a part of IPC. In POSIX message
127 queues every message has a priority which decides about succession
128 of receiving it by a process. If you want to compile and run
129 programs written e.g. for Solaris with use of its POSIX message
130 queues (functions mq_*) say Y here. To use this feature you will
131 also need mqueue library, available from
132 <http://www.mat.uni.torun.pl/~wrona/posix_ipc/>
133
134 POSIX message queues are visible as a filesystem called 'mqueue'
135 and can be mounted somewhere if you want to do filesystem
136 operations on message queues.
137
138 If unsure, say Y.
139
140config BSD_PROCESS_ACCT
141 bool "BSD Process Accounting"
142 help
143 If you say Y here, a user level program will be able to instruct the
144 kernel (via a special system call) to write process accounting
145 information to a file: whenever a process exits, information about
146 that process will be appended to the file by the kernel. The
147 information includes things such as creation time, owning user,
148 command name, memory usage, controlling terminal etc. (the complete
149 list is in the struct acct in <file:include/linux/acct.h>). It is
150 up to the user level program to do useful things with this
151 information. This is generally a good idea, so say Y.
152
153config BSD_PROCESS_ACCT_V3
154 bool "BSD Process Accounting version 3 file format"
155 depends on BSD_PROCESS_ACCT
156 default n
157 help
158 If you say Y here, the process accounting information is written
159 in a new file format that also logs the process IDs of each
160 process and it's parent. Note that this file format is incompatible
161 with previous v0/v1/v2 file formats, so you will need updated tools
162 for processing it. A preliminary version of these tools is available
163 at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
164
165config SYSCTL
166 bool "Sysctl support"
167 ---help---
168 The sysctl interface provides a means of dynamically changing
169 certain kernel parameters and variables on the fly without requiring
170 a recompile of the kernel or reboot of the system. The primary
171 interface consists of a system call, but if you say Y to "/proc
172 file system support", a tree of modifiable sysctl entries will be
173 generated beneath the /proc/sys directory. They are explained in the
174 files in <file:Documentation/sysctl/>. Note that enabling this
175 option will enlarge the kernel by at least 8 KB.
176
177 As it is generally a good thing, you should say Y here unless
178 building a kernel for install/rescue disks or your system is very
179 limited in memory.
180
181config AUDIT
182 bool "Auditing support"
Chris Wright804a6a492005-05-11 10:52:45 +0100183 depends on NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 default y if SECURITY_SELINUX
185 help
186 Enable auditing infrastructure that can be used with another
187 kernel subsystem, such as SELinux (which requires this for
188 logging of avc messages output). Does not do system-call
189 auditing without CONFIG_AUDITSYSCALL.
190
191config AUDITSYSCALL
192 bool "Enable system-call auditing support"
David S. Millerf7ceba32005-07-10 19:29:45 -0700193 depends on AUDIT && (X86 || PPC || PPC64 || ARCH_S390 || IA64 || UML || SPARC64)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 default y if SECURITY_SELINUX
195 help
196 Enable low-overhead system-call auditing infrastructure that
197 can be used independently or with another kernel subsystem,
198 such as SELinux.
199
200config HOTPLUG
201 bool "Support for hot-pluggable devices" if !ARCH_S390
202 default ARCH_S390
203 help
204 This option is provided for the case where no in-kernel-tree
205 modules require HOTPLUG functionality, but a module built
206 outside the kernel tree does. Such modules require Y here.
207
208config KOBJECT_UEVENT
Adrian Bunk83bab9a2005-12-13 02:58:07 +0100209 bool "Kernel Userspace Events" if EMBEDDED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 depends on NET
211 default y
212 help
213 This option enables the kernel userspace event layer, which is a
214 simple mechanism for kernel-to-user communication over a netlink
215 socket.
216 The goal of the kernel userspace events layer is to provide a simple
217 and efficient events system, that notifies userspace about kobject
218 state changes. This will enable applications to just listen for
219 events instead of polling system devices and files.
220 Hotplug events (kobject addition and removal) are also available on
221 the netlink socket in addition to the execution of /sbin/hotplug if
222 CONFIG_HOTPLUG is enabled.
223
224 Say Y, unless you are building a system requiring minimal memory
225 consumption.
226
227config IKCONFIG
228 bool "Kernel .config support"
229 ---help---
230 This option enables the complete Linux kernel ".config" file
231 contents to be saved in the kernel. It provides documentation
232 of which kernel options are used in a running kernel or in an
233 on-disk kernel. This information can be extracted from the kernel
234 image file with the script scripts/extract-ikconfig and used as
235 input to rebuild the current kernel or to build another kernel.
236 It can also be extracted from a running kernel by reading
237 /proc/config.gz if enabled (below).
238
239config IKCONFIG_PROC
240 bool "Enable access to .config through /proc/config.gz"
241 depends on IKCONFIG && PROC_FS
242 ---help---
243 This option enables access to the kernel configuration file
244 through /proc/config.gz.
245
246config CPUSETS
247 bool "Cpuset support"
248 depends on SMP
249 help
Randy Dunlapd9fd8a62005-07-27 11:45:11 -0700250 This option will let you create and manage CPUSETs which
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 allow dynamically partitioning a system into sets of CPUs and
252 Memory Nodes and assigning tasks to run only within those sets.
253 This is primarily useful on large SMP or NUMA systems.
254
255 Say N if unsure.
256
Sam Ravnborgdbec4862005-08-10 20:44:50 +0200257source "usr/Kconfig"
258
Linus Torvaldsc45b4f12005-12-14 18:52:21 -0800259config CC_OPTIMIZE_FOR_SIZE
260 bool "Optimize for size (Look out for broken compilers!)"
261 default y
262 depends on ARM || H8300 || EXPERIMENTAL
263 depends on !SPARC64
264 help
265 Enabling this option will pass "-Os" instead of "-O2" to gcc
266 resulting in a smaller kernel.
267
268 WARNING: some versions of gcc may generate incorrect code with this
269 option. If problems are observed, a gcc upgrade may be needed.
270
271 If unsure, say N.
272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273menuconfig EMBEDDED
274 bool "Configure standard kernel features (for small systems)"
275 help
276 This option allows certain base kernel options and settings
277 to be disabled or tweaked. This is for specialized
278 environments which can tolerate a "non-standard" kernel.
279 Only use this if you really know what you are doing.
280
281config KALLSYMS
282 bool "Load all symbols for debugging/kksymoops" if EMBEDDED
283 default y
284 help
285 Say Y here to let the kernel print out symbolic crash information and
286 symbolic stack backtraces. This increases the size of the kernel
287 somewhat, as all symbols have to be loaded into the kernel image.
288
289config KALLSYMS_ALL
290 bool "Include all symbols in kallsyms"
291 depends on DEBUG_KERNEL && KALLSYMS
292 help
293 Normally kallsyms only contains the symbols of functions, for nicer
294 OOPS messages. Some debuggers can use kallsyms for other
Jesper Juhlf9f97bc2005-07-20 05:43:05 +0200295 symbols too: say Y here to include all symbols, if you need them
296 and you don't care about adding 300k to the size of your kernel.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
298 Say N.
299
300config KALLSYMS_EXTRA_PASS
301 bool "Do an extra kallsyms pass"
302 depends on KALLSYMS
303 help
304 If kallsyms is not working correctly, the build will fail with
305 inconsistent kallsyms data. If that occurs, log a bug report and
306 turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
307 Always say N here unless you find a bug in kallsyms, which must be
308 reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
309 you wait for kallsyms to be fixed.
310
Matt Mackalld59745c2005-05-01 08:59:02 -0700311
312config PRINTK
313 default y
314 bool "Enable support for printk" if EMBEDDED
315 help
316 This option enables normal printk support. Removing it
317 eliminates most of the message strings from the kernel image
318 and makes the kernel more or less silent. As this makes it
319 very difficult to diagnose system problems, saying N here is
320 strongly discouraged.
321
Matt Mackallc8538a72005-05-01 08:59:01 -0700322config BUG
323 bool "BUG() support" if EMBEDDED
324 default y
325 help
326 Disabling this option eliminates support for BUG and WARN, reducing
327 the size of your kernel image and potentially quietly ignoring
328 numerous fatal conditions. You should only consider disabling this
329 option for embedded systems with no facilities for reporting errors.
330 Just say Y.
331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332config BASE_FULL
333 default y
334 bool "Enable full-sized data structures for core" if EMBEDDED
335 help
336 Disabling this option reduces the size of miscellaneous core
337 kernel data structures. This saves memory on small machines,
338 but may reduce performance.
339
340config FUTEX
341 bool "Enable futex support" if EMBEDDED
342 default y
343 help
344 Disabling this option will cause the kernel to be built without
345 support for "fast userspace mutexes". The resulting kernel may not
346 run glibc-based applications correctly.
347
348config EPOLL
349 bool "Enable eventpoll support" if EMBEDDED
350 default y
351 help
352 Disabling this option will cause the kernel to be built without
353 support for epoll family of system calls.
354
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355config SHMEM
356 bool "Use full shmem filesystem" if EMBEDDED
357 default y
358 depends on MMU
359 help
360 The shmem is an internal filesystem used to manage shared memory.
361 It is backed by swap and manages resource limits. It is also exported
362 to userspace as tmpfs if TMPFS is enabled. Disabling this
363 option replaces shmem and tmpfs with the much simpler ramfs code,
364 which may be appropriate on small systems without swap.
365
366config CC_ALIGN_FUNCTIONS
367 int "Function alignment" if EMBEDDED
368 default 0
369 help
370 Align the start of functions to the next power-of-two greater than n,
371 skipping up to n bytes. For instance, 32 aligns functions
372 to the next 32-byte boundary, but 24 would align to the next
373 32-byte boundary only if this can be done by skipping 23 bytes or less.
374 Zero means use compiler's default.
375
376config CC_ALIGN_LABELS
377 int "Label alignment" if EMBEDDED
378 default 0
379 help
380 Align all branch targets to a power-of-two boundary, skipping
381 up to n bytes like ALIGN_FUNCTIONS. This option can easily
382 make code slower, because it must insert dummy operations for
383 when the branch target is reached in the usual flow of the code.
384 Zero means use compiler's default.
385
386config CC_ALIGN_LOOPS
387 int "Loop alignment" if EMBEDDED
388 default 0
389 help
390 Align loops to a power-of-two boundary, skipping up to n bytes.
391 Zero means use compiler's default.
392
393config CC_ALIGN_JUMPS
394 int "Jump alignment" if EMBEDDED
395 default 0
396 help
397 Align branch targets to a power-of-two boundary, for branch
398 targets where the targets can only be reached by jumping,
399 skipping up to n bytes like ALIGN_FUNCTIONS. In this case,
400 no dummy operations need be executed.
401 Zero means use compiler's default.
402
403endmenu # General setup
404
405config TINY_SHMEM
406 default !SHMEM
407 bool
408
409config BASE_SMALL
410 int
411 default 0 if BASE_FULL
412 default 1 if !BASE_FULL
413
414menu "Loadable module support"
415
416config MODULES
417 bool "Enable loadable module support"
418 help
419 Kernel modules are small pieces of compiled code which can
420 be inserted in the running kernel, rather than being
421 permanently built into the kernel. You use the "modprobe"
422 tool to add (and sometimes remove) them. If you say Y here,
423 many parts of the kernel can be built as modules (by
424 answering M instead of Y where indicated): this is most
425 useful for infrequently used options which are not required
426 for booting. For more information, see the man pages for
427 modprobe, lsmod, modinfo, insmod and rmmod.
428
429 If you say Y here, you will need to run "make
430 modules_install" to put the modules under /lib/modules/
431 where modprobe can find them (you may need to be root to do
432 this).
433
434 If unsure, say Y.
435
436config MODULE_UNLOAD
437 bool "Module unloading"
438 depends on MODULES
439 help
440 Without this option you will not be able to unload any
441 modules (note that some modules may not be unloadable
442 anyway), which makes your kernel slightly smaller and
443 simpler. If unsure, say Y.
444
445config MODULE_FORCE_UNLOAD
446 bool "Forced module unloading"
447 depends on MODULE_UNLOAD && EXPERIMENTAL
448 help
449 This option allows you to force a module to unload, even if the
450 kernel believes it is unsafe: the kernel will remove the module
451 without waiting for anyone to stop using it (using the -f option to
452 rmmod). This is mainly for kernel developers and desperate users.
453 If unsure, say N.
454
455config OBSOLETE_MODPARM
456 bool
457 default y
458 depends on MODULES
459 help
460 You need this option to use module parameters on modules which
461 have not been converted to the new module parameter system yet.
462 If unsure, say Y.
463
464config MODVERSIONS
465 bool "Module versioning support (EXPERIMENTAL)"
Paolo 'Blaisorblade' Giarrusso34a1a632005-05-28 15:51:57 -0700466 depends on MODULES && EXPERIMENTAL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 help
468 Usually, you have to use modules compiled with your kernel.
469 Saying Y here makes it sometimes possible to use modules
470 compiled for different kernels, by adding enough information
471 to the modules to (hopefully) spot any changes which would
472 make them incompatible with the kernel you are running. If
473 unsure, say N.
474
475config MODULE_SRCVERSION_ALL
476 bool "Source checksum for all modules"
477 depends on MODULES
478 help
479 Modules which contain a MODULE_VERSION get an extra "srcversion"
480 field inserted into their modinfo section, which contains a
481 sum of the source files which made it. This helps maintainers
482 see exactly which source was used to build a module (since
483 others sometimes change the module source without updating
484 the version). With this option, such a "srcversion" field
485 will be created for all modules. If unsure, say N.
486
487config KMOD
488 bool "Automatic kernel module loading"
489 depends on MODULES
490 help
491 Normally when you have selected some parts of the kernel to
492 be created as kernel modules, you must load them (using the
493 "modprobe" command) before you can use them. If you say Y
494 here, some parts of the kernel will be able to load modules
495 automatically: when a part of the kernel needs a module, it
496 runs modprobe with the appropriate arguments, thereby
497 loading the module if it is available. If unsure, say Y.
498
499config STOP_MACHINE
500 bool
501 default y
502 depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
503 help
504 Need stop_machine() primitive.
505endmenu
Jens Axboe3a65dfe2005-11-04 08:43:35 +0100506
507menu "Block layer"
508source "block/Kconfig"
509endmenu