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1 | config DEFCONFIG_LIST |
2 | string | |
3 | option defconfig_list | |
4 | default "/lib/modules/$UNAME_RELEASE/.config" | |
5 | default "/etc/kernel-config" | |
6 | default "/boot/config-$UNAME_RELEASE" | |
7 | default "arch/$ARCH/defconfig" | |
8 | ||
1da177e4 LT |
9 | menu "Code maturity level options" |
10 | ||
11 | config EXPERIMENTAL | |
12 | bool "Prompt for development and/or incomplete code/drivers" | |
13 | ---help--- | |
14 | Some of the various things that Linux supports (such as network | |
15 | drivers, file systems, network protocols, etc.) can be in a state | |
16 | of development where the functionality, stability, or the level of | |
17 | testing is not yet high enough for general use. This is usually | |
18 | known as the "alpha-test" phase among developers. If a feature is | |
19 | currently in alpha-test, then the developers usually discourage | |
20 | uninformed widespread use of this feature by the general public to | |
21 | avoid "Why doesn't this work?" type mail messages. However, active | |
22 | testing and use of these systems is welcomed. Just be aware that it | |
23 | may not meet the normal level of reliability or it may fail to work | |
24 | in some special cases. Detailed bug reports from people familiar | |
25 | with the kernel internals are usually welcomed by the developers | |
26 | (before submitting bug reports, please read the documents | |
27 | <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>, | |
28 | <file:Documentation/BUG-HUNTING>, and | |
29 | <file:Documentation/oops-tracing.txt> in the kernel source). | |
30 | ||
31 | This option will also make obsoleted drivers available. These are | |
32 | drivers that have been replaced by something else, and/or are | |
33 | scheduled to be removed in a future kernel release. | |
34 | ||
35 | Unless you intend to help test and develop a feature or driver that | |
36 | falls into this category, or you have a situation that requires | |
37 | using these features, you should probably say N here, which will | |
38 | cause the configurator to present you with fewer choices. If | |
39 | you say Y here, you will be offered the choice of using features or | |
40 | drivers that are currently considered to be in the alpha-test phase. | |
41 | ||
1da177e4 LT |
42 | config BROKEN |
43 | bool | |
1da177e4 LT |
44 | |
45 | config BROKEN_ON_SMP | |
46 | bool | |
47 | depends on BROKEN || !SMP | |
48 | default y | |
49 | ||
50 | config LOCK_KERNEL | |
51 | bool | |
52 | depends on SMP || PREEMPT | |
53 | default y | |
54 | ||
55 | config INIT_ENV_ARG_LIMIT | |
56 | int | |
dd673bca AB |
57 | default 32 if !UML |
58 | default 128 if UML | |
1da177e4 | 59 | help |
34ad92c2 RD |
60 | Maximum of each of the number of arguments and environment |
61 | variables passed to init from the kernel command line. | |
1da177e4 LT |
62 | |
63 | endmenu | |
64 | ||
65 | menu "General setup" | |
66 | ||
67 | config LOCALVERSION | |
68 | string "Local version - append to kernel release" | |
69 | help | |
70 | Append an extra string to the end of your kernel version. | |
71 | This will show up when you type uname, for example. | |
72 | The string you set here will be appended after the contents of | |
73 | any files with a filename matching localversion* in your | |
74 | object and source tree, in that order. Your total string can | |
75 | be a maximum of 64 characters. | |
76 | ||
aaebf433 RA |
77 | config LOCALVERSION_AUTO |
78 | bool "Automatically append version information to the version string" | |
79 | default y | |
80 | help | |
81 | This will try to automatically determine if the current tree is a | |
82 | release tree by looking for git tags that | |
83 | belong to the current top of tree revision. | |
84 | ||
85 | A string of the format -gxxxxxxxx will be added to the localversion | |
86 | if a git based tree is found. The string generated by this will be | |
87 | appended after any matching localversion* files, and after the value | |
88 | set in CONFIG_LOCALVERSION | |
89 | ||
90 | Note: This requires Perl, and a git repository, but not necessarily | |
91 | the git or cogito tools to be installed. | |
92 | ||
1da177e4 LT |
93 | config SWAP |
94 | bool "Support for paging of anonymous memory (swap)" | |
9361401e | 95 | depends on MMU && BLOCK |
1da177e4 LT |
96 | default y |
97 | help | |
98 | This option allows you to choose whether you want to have support | |
92c3504e | 99 | for so called swap devices or swap files in your kernel that are |
1da177e4 LT |
100 | used to provide more virtual memory than the actual RAM present |
101 | in your computer. If unsure say Y. | |
102 | ||
103 | config SYSVIPC | |
104 | bool "System V IPC" | |
1da177e4 LT |
105 | ---help--- |
106 | Inter Process Communication is a suite of library functions and | |
107 | system calls which let processes (running programs) synchronize and | |
108 | exchange information. It is generally considered to be a good thing, | |
109 | and some programs won't run unless you say Y here. In particular, if | |
110 | you want to run the DOS emulator dosemu under Linux (read the | |
111 | DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>), | |
112 | you'll need to say Y here. | |
113 | ||
114 | You can find documentation about IPC with "info ipc" and also in | |
115 | section 6.4 of the Linux Programmer's Guide, available from | |
116 | <http://www.tldp.org/guides.html>. | |
117 | ||
25b21cb2 KK |
118 | config IPC_NS |
119 | bool "IPC Namespaces" | |
120 | depends on SYSVIPC | |
121 | default n | |
122 | help | |
123 | Support ipc namespaces. This allows containers, i.e. virtual | |
124 | environments, to use ipc namespaces to provide different ipc | |
125 | objects for different servers. If unsure, say N. | |
126 | ||
1da177e4 LT |
127 | config POSIX_MQUEUE |
128 | bool "POSIX Message Queues" | |
129 | depends on NET && EXPERIMENTAL | |
130 | ---help--- | |
131 | POSIX variant of message queues is a part of IPC. In POSIX message | |
132 | queues every message has a priority which decides about succession | |
133 | of receiving it by a process. If you want to compile and run | |
134 | programs written e.g. for Solaris with use of its POSIX message | |
135 | queues (functions mq_*) say Y here. To use this feature you will | |
136 | also need mqueue library, available from | |
137 | <http://www.mat.uni.torun.pl/~wrona/posix_ipc/> | |
138 | ||
139 | POSIX message queues are visible as a filesystem called 'mqueue' | |
140 | and can be mounted somewhere if you want to do filesystem | |
141 | operations on message queues. | |
142 | ||
143 | If unsure, say Y. | |
144 | ||
145 | config BSD_PROCESS_ACCT | |
146 | bool "BSD Process Accounting" | |
147 | help | |
148 | If you say Y here, a user level program will be able to instruct the | |
149 | kernel (via a special system call) to write process accounting | |
150 | information to a file: whenever a process exits, information about | |
151 | that process will be appended to the file by the kernel. The | |
152 | information includes things such as creation time, owning user, | |
153 | command name, memory usage, controlling terminal etc. (the complete | |
154 | list is in the struct acct in <file:include/linux/acct.h>). It is | |
155 | up to the user level program to do useful things with this | |
156 | information. This is generally a good idea, so say Y. | |
157 | ||
158 | config BSD_PROCESS_ACCT_V3 | |
159 | bool "BSD Process Accounting version 3 file format" | |
160 | depends on BSD_PROCESS_ACCT | |
161 | default n | |
162 | help | |
163 | If you say Y here, the process accounting information is written | |
164 | in a new file format that also logs the process IDs of each | |
165 | process and it's parent. Note that this file format is incompatible | |
166 | with previous v0/v1/v2 file formats, so you will need updated tools | |
167 | for processing it. A preliminary version of these tools is available | |
168 | at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>. | |
169 | ||
c757249a SN |
170 | config TASKSTATS |
171 | bool "Export task/process statistics through netlink (EXPERIMENTAL)" | |
172 | depends on NET | |
173 | default n | |
174 | help | |
175 | Export selected statistics for tasks/processes through the | |
176 | generic netlink interface. Unlike BSD process accounting, the | |
177 | statistics are available during the lifetime of tasks/processes as | |
178 | responses to commands. Like BSD accounting, they are sent to user | |
179 | space on task exit. | |
180 | ||
181 | Say N if unsure. | |
182 | ||
ca74e92b SN |
183 | config TASK_DELAY_ACCT |
184 | bool "Enable per-task delay accounting (EXPERIMENTAL)" | |
6f44993f | 185 | depends on TASKSTATS |
ca74e92b SN |
186 | help |
187 | Collect information on time spent by a task waiting for system | |
188 | resources like cpu, synchronous block I/O completion and swapping | |
189 | in pages. Such statistics can help in setting a task's priorities | |
190 | relative to other tasks for cpu, io, rss limits etc. | |
191 | ||
192 | Say N if unsure. | |
193 | ||
4865ecf1 SH |
194 | config UTS_NS |
195 | bool "UTS Namespaces" | |
196 | default n | |
197 | help | |
198 | Support uts namespaces. This allows containers, i.e. | |
199 | vservers, to use uts namespaces to provide different | |
200 | uts info for different servers. If unsure, say N. | |
201 | ||
1da177e4 LT |
202 | config AUDIT |
203 | bool "Auditing support" | |
804a6a49 | 204 | depends on NET |
1da177e4 LT |
205 | help |
206 | Enable auditing infrastructure that can be used with another | |
207 | kernel subsystem, such as SELinux (which requires this for | |
208 | logging of avc messages output). Does not do system-call | |
209 | auditing without CONFIG_AUDITSYSCALL. | |
210 | ||
211 | config AUDITSYSCALL | |
212 | bool "Enable system-call auditing support" | |
347a8dc3 | 213 | depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64) |
1da177e4 LT |
214 | default y if SECURITY_SELINUX |
215 | help | |
216 | Enable low-overhead system-call auditing infrastructure that | |
217 | can be used independently or with another kernel subsystem, | |
f368c07d AG |
218 | such as SELinux. To use audit's filesystem watch feature, please |
219 | ensure that INOTIFY is configured. | |
1da177e4 | 220 | |
1da177e4 | 221 | config IKCONFIG |
f2443ab6 | 222 | tristate "Kernel .config support" |
1da177e4 LT |
223 | ---help--- |
224 | This option enables the complete Linux kernel ".config" file | |
225 | contents to be saved in the kernel. It provides documentation | |
226 | of which kernel options are used in a running kernel or in an | |
227 | on-disk kernel. This information can be extracted from the kernel | |
228 | image file with the script scripts/extract-ikconfig and used as | |
229 | input to rebuild the current kernel or to build another kernel. | |
230 | It can also be extracted from a running kernel by reading | |
231 | /proc/config.gz if enabled (below). | |
232 | ||
233 | config IKCONFIG_PROC | |
234 | bool "Enable access to .config through /proc/config.gz" | |
235 | depends on IKCONFIG && PROC_FS | |
236 | ---help--- | |
237 | This option enables access to the kernel configuration file | |
238 | through /proc/config.gz. | |
239 | ||
240 | config CPUSETS | |
241 | bool "Cpuset support" | |
242 | depends on SMP | |
243 | help | |
d9fd8a6d | 244 | This option will let you create and manage CPUSETs which |
1da177e4 LT |
245 | allow dynamically partitioning a system into sets of CPUs and |
246 | Memory Nodes and assigning tasks to run only within those sets. | |
247 | This is primarily useful on large SMP or NUMA systems. | |
248 | ||
249 | Say N if unsure. | |
250 | ||
b86ff981 JA |
251 | config RELAY |
252 | bool "Kernel->user space relay support (formerly relayfs)" | |
253 | help | |
254 | This option enables support for relay interface support in | |
255 | certain file systems (such as debugfs). | |
256 | It is designed to provide an efficient mechanism for tools and | |
257 | facilities to relay large amounts of data from kernel space to | |
258 | user space. | |
259 | ||
260 | If unsure, say N. | |
261 | ||
dbec4866 SR |
262 | source "usr/Kconfig" |
263 | ||
c45b4f1f LT |
264 | config CC_OPTIMIZE_FOR_SIZE |
265 | bool "Optimize for size (Look out for broken compilers!)" | |
266 | default y | |
267 | depends on ARM || H8300 || EXPERIMENTAL | |
c45b4f1f LT |
268 | help |
269 | Enabling this option will pass "-Os" instead of "-O2" to gcc | |
270 | resulting in a smaller kernel. | |
271 | ||
272 | WARNING: some versions of gcc may generate incorrect code with this | |
273 | option. If problems are observed, a gcc upgrade may be needed. | |
274 | ||
275 | If unsure, say N. | |
276 | ||
9acc1853 JL |
277 | config TASK_XACCT |
278 | bool "Enable extended accounting over taskstats (EXPERIMENTAL)" | |
279 | depends on TASKSTATS | |
280 | help | |
281 | Collect extended task accounting data and send the data | |
282 | to userland for processing over the taskstats interface. | |
283 | ||
284 | Say N if unsure. | |
285 | ||
0847062a RD |
286 | config SYSCTL |
287 | bool | |
288 | ||
1da177e4 LT |
289 | menuconfig EMBEDDED |
290 | bool "Configure standard kernel features (for small systems)" | |
291 | help | |
292 | This option allows certain base kernel options and settings | |
293 | to be disabled or tweaked. This is for specialized | |
294 | environments which can tolerate a "non-standard" kernel. | |
295 | Only use this if you really know what you are doing. | |
296 | ||
ae81f9e3 CE |
297 | config UID16 |
298 | bool "Enable 16-bit UID system calls" if EMBEDDED | |
299 | depends on ARM || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION) | |
300 | default y | |
301 | help | |
302 | This enables the legacy 16-bit UID syscall wrappers. | |
303 | ||
b89a8171 | 304 | config SYSCTL_SYSCALL |
0847062a | 305 | bool "Sysctl syscall support" if EMBEDDED |
b89a8171 EB |
306 | default n |
307 | select SYSCTL | |
ae81f9e3 | 308 | ---help--- |
b89a8171 EB |
309 | Enable the deprecated sysctl system call. sys_sysctl uses |
310 | binary paths that have been found to be a major pain to maintain | |
311 | and use. The interface in /proc/sys is now the primary and what | |
312 | everyone uses. | |
313 | ||
0847062a | 314 | Nothing has been using the binary sysctl interface for some |
b89a8171 | 315 | time now so nothing should break if you disable sysctl syscall |
0847062a | 316 | support, and your kernel will get marginally smaller. |
b89a8171 | 317 | |
0847062a | 318 | Unless you have an application that uses the sys_sysctl interface |
b89a8171 | 319 | you should probably say N here. |
ae81f9e3 | 320 | |
1da177e4 LT |
321 | config KALLSYMS |
322 | bool "Load all symbols for debugging/kksymoops" if EMBEDDED | |
323 | default y | |
324 | help | |
325 | Say Y here to let the kernel print out symbolic crash information and | |
326 | symbolic stack backtraces. This increases the size of the kernel | |
327 | somewhat, as all symbols have to be loaded into the kernel image. | |
328 | ||
329 | config KALLSYMS_ALL | |
330 | bool "Include all symbols in kallsyms" | |
331 | depends on DEBUG_KERNEL && KALLSYMS | |
332 | help | |
333 | Normally kallsyms only contains the symbols of functions, for nicer | |
334 | OOPS messages. Some debuggers can use kallsyms for other | |
f9f97bc0 JJ |
335 | symbols too: say Y here to include all symbols, if you need them |
336 | and you don't care about adding 300k to the size of your kernel. | |
1da177e4 LT |
337 | |
338 | Say N. | |
339 | ||
340 | config KALLSYMS_EXTRA_PASS | |
341 | bool "Do an extra kallsyms pass" | |
342 | depends on KALLSYMS | |
343 | help | |
344 | If kallsyms is not working correctly, the build will fail with | |
345 | inconsistent kallsyms data. If that occurs, log a bug report and | |
346 | turn on KALLSYMS_EXTRA_PASS which should result in a stable build. | |
347 | Always say N here unless you find a bug in kallsyms, which must be | |
348 | reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while | |
349 | you wait for kallsyms to be fixed. | |
350 | ||
d59745ce | 351 | |
712f47ce GKH |
352 | config HOTPLUG |
353 | bool "Support for hot-pluggable devices" if EMBEDDED | |
354 | default y | |
355 | help | |
356 | This option is provided for the case where no hotplug or uevent | |
357 | capabilities is wanted by the kernel. You should only consider | |
358 | disabling this option for embedded systems that do not use modules, a | |
359 | dynamic /dev tree, or dynamic device discovery. Just say Y. | |
360 | ||
d59745ce MM |
361 | config PRINTK |
362 | default y | |
363 | bool "Enable support for printk" if EMBEDDED | |
364 | help | |
365 | This option enables normal printk support. Removing it | |
366 | eliminates most of the message strings from the kernel image | |
367 | and makes the kernel more or less silent. As this makes it | |
368 | very difficult to diagnose system problems, saying N here is | |
369 | strongly discouraged. | |
370 | ||
c8538a7a MM |
371 | config BUG |
372 | bool "BUG() support" if EMBEDDED | |
373 | default y | |
374 | help | |
375 | Disabling this option eliminates support for BUG and WARN, reducing | |
376 | the size of your kernel image and potentially quietly ignoring | |
377 | numerous fatal conditions. You should only consider disabling this | |
378 | option for embedded systems with no facilities for reporting errors. | |
379 | Just say Y. | |
380 | ||
708e9a79 MM |
381 | config ELF_CORE |
382 | default y | |
383 | bool "Enable ELF core dumps" if EMBEDDED | |
384 | help | |
385 | Enable support for generating core dumps. Disabling saves about 4k. | |
386 | ||
1da177e4 LT |
387 | config BASE_FULL |
388 | default y | |
389 | bool "Enable full-sized data structures for core" if EMBEDDED | |
390 | help | |
391 | Disabling this option reduces the size of miscellaneous core | |
392 | kernel data structures. This saves memory on small machines, | |
393 | but may reduce performance. | |
394 | ||
395 | config FUTEX | |
396 | bool "Enable futex support" if EMBEDDED | |
397 | default y | |
23f78d4a | 398 | select RT_MUTEXES |
1da177e4 LT |
399 | help |
400 | Disabling this option will cause the kernel to be built without | |
401 | support for "fast userspace mutexes". The resulting kernel may not | |
402 | run glibc-based applications correctly. | |
403 | ||
404 | config EPOLL | |
405 | bool "Enable eventpoll support" if EMBEDDED | |
406 | default y | |
407 | help | |
408 | Disabling this option will cause the kernel to be built without | |
409 | support for epoll family of system calls. | |
410 | ||
1da177e4 LT |
411 | config SHMEM |
412 | bool "Use full shmem filesystem" if EMBEDDED | |
413 | default y | |
414 | depends on MMU | |
415 | help | |
416 | The shmem is an internal filesystem used to manage shared memory. | |
417 | It is backed by swap and manages resource limits. It is also exported | |
418 | to userspace as tmpfs if TMPFS is enabled. Disabling this | |
419 | option replaces shmem and tmpfs with the much simpler ramfs code, | |
420 | which may be appropriate on small systems without swap. | |
421 | ||
10cef602 MM |
422 | config SLAB |
423 | default y | |
424 | bool "Use full SLAB allocator" if EMBEDDED | |
425 | help | |
426 | Disabling this replaces the advanced SLAB allocator and | |
427 | kmalloc support with the drastically simpler SLOB allocator. | |
428 | SLOB is more space efficient but does not scale well and is | |
429 | more susceptible to fragmentation. | |
430 | ||
f8891e5e CL |
431 | config VM_EVENT_COUNTERS |
432 | default y | |
433 | bool "Enable VM event counters for /proc/vmstat" if EMBEDDED | |
434 | help | |
435 | VM event counters are only needed to for event counts to be | |
436 | shown. They have no function for the kernel itself. This | |
437 | option allows the disabling of the VM event counters. | |
438 | /proc/vmstat will only show page counts. | |
439 | ||
1da177e4 LT |
440 | endmenu # General setup |
441 | ||
ae81f9e3 CE |
442 | config RT_MUTEXES |
443 | boolean | |
444 | select PLIST | |
445 | ||
1da177e4 LT |
446 | config TINY_SHMEM |
447 | default !SHMEM | |
448 | bool | |
449 | ||
450 | config BASE_SMALL | |
451 | int | |
452 | default 0 if BASE_FULL | |
453 | default 1 if !BASE_FULL | |
454 | ||
10cef602 MM |
455 | config SLOB |
456 | default !SLAB | |
457 | bool | |
458 | ||
1da177e4 LT |
459 | menu "Loadable module support" |
460 | ||
461 | config MODULES | |
462 | bool "Enable loadable module support" | |
463 | help | |
464 | Kernel modules are small pieces of compiled code which can | |
465 | be inserted in the running kernel, rather than being | |
466 | permanently built into the kernel. You use the "modprobe" | |
467 | tool to add (and sometimes remove) them. If you say Y here, | |
468 | many parts of the kernel can be built as modules (by | |
469 | answering M instead of Y where indicated): this is most | |
470 | useful for infrequently used options which are not required | |
471 | for booting. For more information, see the man pages for | |
472 | modprobe, lsmod, modinfo, insmod and rmmod. | |
473 | ||
474 | If you say Y here, you will need to run "make | |
475 | modules_install" to put the modules under /lib/modules/ | |
476 | where modprobe can find them (you may need to be root to do | |
477 | this). | |
478 | ||
479 | If unsure, say Y. | |
480 | ||
481 | config MODULE_UNLOAD | |
482 | bool "Module unloading" | |
483 | depends on MODULES | |
484 | help | |
485 | Without this option you will not be able to unload any | |
486 | modules (note that some modules may not be unloadable | |
487 | anyway), which makes your kernel slightly smaller and | |
488 | simpler. If unsure, say Y. | |
489 | ||
490 | config MODULE_FORCE_UNLOAD | |
491 | bool "Forced module unloading" | |
492 | depends on MODULE_UNLOAD && EXPERIMENTAL | |
493 | help | |
494 | This option allows you to force a module to unload, even if the | |
495 | kernel believes it is unsafe: the kernel will remove the module | |
496 | without waiting for anyone to stop using it (using the -f option to | |
497 | rmmod). This is mainly for kernel developers and desperate users. | |
498 | If unsure, say N. | |
499 | ||
1da177e4 | 500 | config MODVERSIONS |
0d541643 SR |
501 | bool "Module versioning support" |
502 | depends on MODULES | |
1da177e4 LT |
503 | help |
504 | Usually, you have to use modules compiled with your kernel. | |
505 | Saying Y here makes it sometimes possible to use modules | |
506 | compiled for different kernels, by adding enough information | |
507 | to the modules to (hopefully) spot any changes which would | |
508 | make them incompatible with the kernel you are running. If | |
509 | unsure, say N. | |
510 | ||
511 | config MODULE_SRCVERSION_ALL | |
512 | bool "Source checksum for all modules" | |
513 | depends on MODULES | |
514 | help | |
515 | Modules which contain a MODULE_VERSION get an extra "srcversion" | |
516 | field inserted into their modinfo section, which contains a | |
517 | sum of the source files which made it. This helps maintainers | |
518 | see exactly which source was used to build a module (since | |
519 | others sometimes change the module source without updating | |
520 | the version). With this option, such a "srcversion" field | |
521 | will be created for all modules. If unsure, say N. | |
522 | ||
523 | config KMOD | |
524 | bool "Automatic kernel module loading" | |
525 | depends on MODULES | |
526 | help | |
527 | Normally when you have selected some parts of the kernel to | |
528 | be created as kernel modules, you must load them (using the | |
529 | "modprobe" command) before you can use them. If you say Y | |
530 | here, some parts of the kernel will be able to load modules | |
531 | automatically: when a part of the kernel needs a module, it | |
532 | runs modprobe with the appropriate arguments, thereby | |
533 | loading the module if it is available. If unsure, say Y. | |
534 | ||
535 | config STOP_MACHINE | |
536 | bool | |
537 | default y | |
538 | depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU | |
539 | help | |
540 | Need stop_machine() primitive. | |
541 | endmenu | |
3a65dfe8 JA |
542 | |
543 | menu "Block layer" | |
544 | source "block/Kconfig" | |
545 | endmenu |