| blob | 176f7e5136c74d2db3923c69751121cdb460d451 |
1 config DEFCONFIG_LIST
2 string
3 depends on !UML
4 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"
10 menu "Code maturity level options"
12 config 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).
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33 drivers that have been replaced by something else, and/or are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.
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.
43 config BROKEN
44 bool
46 config BROKEN_ON_SMP
47 bool
48 depends on BROKEN || !SMP
49 default y
51 config LOCK_KERNEL
52 bool
53 depends on SMP || PREEMPT
54 default y
56 config INIT_ENV_ARG_LIMIT
57 int
58 default 32 if !UML
59 default 128 if UML
60 help
61 Maximum of each of the number of arguments and environment
62 variables passed to init from the kernel command line.
64 endmenu
66 menu "General setup"
68 config LOCALVERSION
69 string "Local version - append to kernel release"
70 help
71 Append an extra string to the end of your kernel version.
72 This will show up when you type uname, for example.
73 The string you set here will be appended after the contents of
74 any files with a filename matching localversion* in your
75 object and source tree, in that order. Your total string can
76 be a maximum of 64 characters.
78 config LOCALVERSION_AUTO
79 bool "Automatically append version information to the version string"
80 default y
81 help
82 This will try to automatically determine if the current tree is a
83 release tree by looking for git tags that
84 belong to the current top of tree revision.
86 A string of the format -gxxxxxxxx will be added to the localversion
87 if a git based tree is found. The string generated by this will be
88 appended after any matching localversion* files, and after the value
89 set in CONFIG_LOCALVERSION
91 Note: This requires Perl, and a git repository, but not necessarily
92 the git or cogito tools to be installed.
94 config SWAP
95 bool "Support for paging of anonymous memory (swap)"
96 depends on MMU && BLOCK
97 default y
98 help
99 This option allows you to choose whether you want to have support
100 for so called swap devices or swap files in your kernel that are
101 used to provide more virtual memory than the actual RAM present
102 in your computer. If unsure say Y.
104 config SYSVIPC
105 bool "System V IPC"
106 ---help---
107 Inter Process Communication is a suite of library functions and
108 system calls which let processes (running programs) synchronize and
109 exchange information. It is generally considered to be a good thing,
110 and some programs won't run unless you say Y here. In particular, if
111 you want to run the DOS emulator dosemu under Linux (read the
112 DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
113 you'll need to say Y here.
115 You can find documentation about IPC with "info ipc" and also in
116 section 6.4 of the Linux Programmer's Guide, available from
117 <http://www.tldp.org/guides.html>.
119 config IPC_NS
120 bool "IPC Namespaces"
121 depends on SYSVIPC
122 default n
123 help
124 Support ipc namespaces. This allows containers, i.e. virtual
125 environments, to use ipc namespaces to provide different ipc
126 objects for different servers. If unsure, say N.
128 config POSIX_MQUEUE
129 bool "POSIX Message Queues"
130 depends on NET && EXPERIMENTAL
131 ---help---
132 POSIX variant of message queues is a part of IPC. In POSIX message
133 queues every message has a priority which decides about succession
134 of receiving it by a process. If you want to compile and run
135 programs written e.g. for Solaris with use of its POSIX message
136 queues (functions mq_*) say Y here. To use this feature you will
137 also need mqueue library, available from
138 <http://www.mat.uni.torun.pl/~wrona/posix_ipc/>
140 POSIX message queues are visible as a filesystem called 'mqueue'
141 and can be mounted somewhere if you want to do filesystem
142 operations on message queues.
144 If unsure, say Y.
146 config BSD_PROCESS_ACCT
147 bool "BSD Process Accounting"
148 help
149 If you say Y here, a user level program will be able to instruct the
150 kernel (via a special system call) to write process accounting
151 information to a file: whenever a process exits, information about
152 that process will be appended to the file by the kernel. The
153 information includes things such as creation time, owning user,
154 command name, memory usage, controlling terminal etc. (the complete
155 list is in the struct acct in <file:include/linux/acct.h>). It is
156 up to the user level program to do useful things with this
157 information. This is generally a good idea, so say Y.
159 config BSD_PROCESS_ACCT_V3
160 bool "BSD Process Accounting version 3 file format"
161 depends on BSD_PROCESS_ACCT
162 default n
163 help
164 If you say Y here, the process accounting information is written
165 in a new file format that also logs the process IDs of each
166 process and it's parent. Note that this file format is incompatible
167 with previous v0/v1/v2 file formats, so you will need updated tools
168 for processing it. A preliminary version of these tools is available
169 at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
171 config TASKSTATS
172 bool "Export task/process statistics through netlink (EXPERIMENTAL)"
173 depends on NET
174 default n
175 help
176 Export selected statistics for tasks/processes through the
177 generic netlink interface. Unlike BSD process accounting, the
178 statistics are available during the lifetime of tasks/processes as
179 responses to commands. Like BSD accounting, they are sent to user
180 space on task exit.
182 Say N if unsure.
184 config TASK_DELAY_ACCT
185 bool "Enable per-task delay accounting (EXPERIMENTAL)"
186 depends on TASKSTATS
187 help
188 Collect information on time spent by a task waiting for system
189 resources like cpu, synchronous block I/O completion and swapping
190 in pages. Such statistics can help in setting a task's priorities
191 relative to other tasks for cpu, io, rss limits etc.
193 Say N if unsure.
195 config UTS_NS
196 bool "UTS Namespaces"
197 default n
198 help
199 Support uts namespaces. This allows containers, i.e.
200 vservers, to use uts namespaces to provide different
201 uts info for different servers. If unsure, say N.
203 config AUDIT
204 bool "Auditing support"
205 depends on NET
206 help
207 Enable auditing infrastructure that can be used with another
208 kernel subsystem, such as SELinux (which requires this for
209 logging of avc messages output). Does not do system-call
210 auditing without CONFIG_AUDITSYSCALL.
212 config AUDITSYSCALL
213 bool "Enable system-call auditing support"
214 depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64)
215 default y if SECURITY_SELINUX
216 help
217 Enable low-overhead system-call auditing infrastructure that
218 can be used independently or with another kernel subsystem,
219 such as SELinux. To use audit's filesystem watch feature, please
220 ensure that INOTIFY is configured.
222 config IKCONFIG
223 tristate "Kernel .config support"
224 ---help---
225 This option enables the complete Linux kernel ".config" file
226 contents to be saved in the kernel. It provides documentation
227 of which kernel options are used in a running kernel or in an
228 on-disk kernel. This information can be extracted from the kernel
229 image file with the script scripts/extract-ikconfig and used as
230 input to rebuild the current kernel or to build another kernel.
231 It can also be extracted from a running kernel by reading
232 /proc/config.gz if enabled (below).
234 config IKCONFIG_PROC
235 bool "Enable access to .config through /proc/config.gz"
236 depends on IKCONFIG && PROC_FS
237 ---help---
238 This option enables access to the kernel configuration file
239 through /proc/config.gz.
241 config CPUSETS
242 bool "Cpuset support"
243 depends on SMP
244 help
245 This option will let you create and manage CPUSETs which
246 allow dynamically partitioning a system into sets of CPUs and
247 Memory Nodes and assigning tasks to run only within those sets.
248 This is primarily useful on large SMP or NUMA systems.
250 Say N if unsure.
252 config RELAY
253 bool "Kernel->user space relay support (formerly relayfs)"
254 help
255 This option enables support for relay interface support in
256 certain file systems (such as debugfs).
257 It is designed to provide an efficient mechanism for tools and
258 facilities to relay large amounts of data from kernel space to
259 user space.
261 If unsure, say N.
263 source "usr/Kconfig"
265 config CC_OPTIMIZE_FOR_SIZE
266 bool "Optimize for size (Look out for broken compilers!)"
267 default y
268 depends on ARM || H8300 || EXPERIMENTAL
269 help
270 Enabling this option will pass "-Os" instead of "-O2" to gcc
271 resulting in a smaller kernel.
273 WARNING: some versions of gcc may generate incorrect code with this
274 option. If problems are observed, a gcc upgrade may be needed.
276 If unsure, say N.
278 config TASK_XACCT
279 bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
280 depends on TASKSTATS
281 help
282 Collect extended task accounting data and send the data
283 to userland for processing over the taskstats interface.
285 Say N if unsure.
287 config SYSCTL
288 bool
290 menuconfig EMBEDDED
291 bool "Configure standard kernel features (for small systems)"
292 help
293 This option allows certain base kernel options and settings
294 to be disabled or tweaked. This is for specialized
295 environments which can tolerate a "non-standard" kernel.
296 Only use this if you really know what you are doing.
298 config UID16
299 bool "Enable 16-bit UID system calls" if EMBEDDED
300 depends on ARM || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION)
301 default y
302 help
303 This enables the legacy 16-bit UID syscall wrappers.
305 config SYSCTL_SYSCALL
306 bool "Sysctl syscall support" if EMBEDDED
307 default y
308 select SYSCTL
309 ---help---
310 sys_sysctl uses binary paths that have been found challenging
311 to properly maintain and use. The interface in /proc/sys
312 using paths with ascii names is now the primary path to this
313 information.
315 Almost nothing using the binary sysctl interface so if you are
316 trying to save some space it is probably safe to disable this,
317 making your kernel marginally smaller.
319 If unsure say Y here.
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.
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
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.
338 Say N.
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.
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.
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.
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.
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.
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.
395 config FUTEX
396 bool "Enable futex support" if EMBEDDED
397 default y
398 select RT_MUTEXES
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.
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.
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.
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.
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.
440 endmenu # General setup
442 config RT_MUTEXES
443 boolean
444 select PLIST
446 config TINY_SHMEM
447 default !SHMEM
448 bool
450 config BASE_SMALL
451 int
452 default 0 if BASE_FULL
453 default 1 if !BASE_FULL
455 config SLOB
456 default !SLAB
457 bool
459 menu "Loadable module support"
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.
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).
479 If unsure, say Y.
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.
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.
500 config MODVERSIONS
501 bool "Module versioning support"
502 depends on MODULES
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.
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.
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.
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
543 menu "Block layer"
544 source "block/Kconfig"
545 endmenu