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80daa560 RZ |
1 | config ARCH |
2 | string | |
3 | option env="ARCH" | |
4 | ||
5 | config KERNELVERSION | |
6 | string | |
7 | option env="KERNELVERSION" | |
8 | ||
face4374 RZ |
9 | config DEFCONFIG_LIST |
10 | string | |
b2670eac | 11 | depends on !UML |
face4374 RZ |
12 | option defconfig_list |
13 | default "/lib/modules/$UNAME_RELEASE/.config" | |
14 | default "/etc/kernel-config" | |
15 | default "/boot/config-$UNAME_RELEASE" | |
73531905 | 16 | default "$ARCH_DEFCONFIG" |
face4374 RZ |
17 | default "arch/$ARCH/defconfig" |
18 | ||
ff0cfc66 | 19 | menu "General setup" |
1da177e4 LT |
20 | |
21 | config EXPERIMENTAL | |
22 | bool "Prompt for development and/or incomplete code/drivers" | |
23 | ---help--- | |
24 | Some of the various things that Linux supports (such as network | |
25 | drivers, file systems, network protocols, etc.) can be in a state | |
26 | of development where the functionality, stability, or the level of | |
27 | testing is not yet high enough for general use. This is usually | |
28 | known as the "alpha-test" phase among developers. If a feature is | |
29 | currently in alpha-test, then the developers usually discourage | |
30 | uninformed widespread use of this feature by the general public to | |
31 | avoid "Why doesn't this work?" type mail messages. However, active | |
32 | testing and use of these systems is welcomed. Just be aware that it | |
33 | may not meet the normal level of reliability or it may fail to work | |
34 | in some special cases. Detailed bug reports from people familiar | |
35 | with the kernel internals are usually welcomed by the developers | |
36 | (before submitting bug reports, please read the documents | |
37 | <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>, | |
38 | <file:Documentation/BUG-HUNTING>, and | |
39 | <file:Documentation/oops-tracing.txt> in the kernel source). | |
40 | ||
41 | This option will also make obsoleted drivers available. These are | |
42 | drivers that have been replaced by something else, and/or are | |
43 | scheduled to be removed in a future kernel release. | |
44 | ||
45 | Unless you intend to help test and develop a feature or driver that | |
46 | falls into this category, or you have a situation that requires | |
47 | using these features, you should probably say N here, which will | |
48 | cause the configurator to present you with fewer choices. If | |
49 | you say Y here, you will be offered the choice of using features or | |
50 | drivers that are currently considered to be in the alpha-test phase. | |
51 | ||
1da177e4 LT |
52 | config BROKEN |
53 | bool | |
1da177e4 LT |
54 | |
55 | config BROKEN_ON_SMP | |
56 | bool | |
57 | depends on BROKEN || !SMP | |
58 | default y | |
59 | ||
60 | config LOCK_KERNEL | |
61 | bool | |
62 | depends on SMP || PREEMPT | |
63 | default y | |
64 | ||
65 | config INIT_ENV_ARG_LIMIT | |
66 | int | |
dd673bca AB |
67 | default 32 if !UML |
68 | default 128 if UML | |
1da177e4 | 69 | help |
34ad92c2 RD |
70 | Maximum of each of the number of arguments and environment |
71 | variables passed to init from the kernel command line. | |
1da177e4 | 72 | |
1da177e4 LT |
73 | |
74 | config LOCALVERSION | |
75 | string "Local version - append to kernel release" | |
76 | help | |
77 | Append an extra string to the end of your kernel version. | |
78 | This will show up when you type uname, for example. | |
79 | The string you set here will be appended after the contents of | |
80 | any files with a filename matching localversion* in your | |
81 | object and source tree, in that order. Your total string can | |
82 | be a maximum of 64 characters. | |
83 | ||
aaebf433 RA |
84 | config LOCALVERSION_AUTO |
85 | bool "Automatically append version information to the version string" | |
86 | default y | |
87 | help | |
88 | This will try to automatically determine if the current tree is a | |
6e5a5420 RD |
89 | release tree by looking for git tags that belong to the current |
90 | top of tree revision. | |
aaebf433 RA |
91 | |
92 | A string of the format -gxxxxxxxx will be added to the localversion | |
6e5a5420 | 93 | if a git-based tree is found. The string generated by this will be |
aaebf433 | 94 | appended after any matching localversion* files, and after the value |
6e5a5420 | 95 | set in CONFIG_LOCALVERSION. |
aaebf433 | 96 | |
6e5a5420 RD |
97 | (The actual string used here is the first eight characters produced |
98 | by running the command: | |
99 | ||
100 | $ git rev-parse --verify HEAD | |
101 | ||
102 | which is done within the script "scripts/setlocalversion".) | |
aaebf433 | 103 | |
1da177e4 LT |
104 | config SWAP |
105 | bool "Support for paging of anonymous memory (swap)" | |
9361401e | 106 | depends on MMU && BLOCK |
1da177e4 LT |
107 | default y |
108 | help | |
109 | This option allows you to choose whether you want to have support | |
92c3504e | 110 | for so called swap devices or swap files in your kernel that are |
1da177e4 LT |
111 | used to provide more virtual memory than the actual RAM present |
112 | in your computer. If unsure say Y. | |
113 | ||
114 | config SYSVIPC | |
115 | bool "System V IPC" | |
1da177e4 LT |
116 | ---help--- |
117 | Inter Process Communication is a suite of library functions and | |
118 | system calls which let processes (running programs) synchronize and | |
119 | exchange information. It is generally considered to be a good thing, | |
120 | and some programs won't run unless you say Y here. In particular, if | |
121 | you want to run the DOS emulator dosemu under Linux (read the | |
122 | DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>), | |
123 | you'll need to say Y here. | |
124 | ||
125 | You can find documentation about IPC with "info ipc" and also in | |
126 | section 6.4 of the Linux Programmer's Guide, available from | |
127 | <http://www.tldp.org/guides.html>. | |
128 | ||
a5494dcd EB |
129 | config SYSVIPC_SYSCTL |
130 | bool | |
131 | depends on SYSVIPC | |
132 | depends on SYSCTL | |
133 | default y | |
134 | ||
1da177e4 LT |
135 | config POSIX_MQUEUE |
136 | bool "POSIX Message Queues" | |
137 | depends on NET && EXPERIMENTAL | |
138 | ---help--- | |
139 | POSIX variant of message queues is a part of IPC. In POSIX message | |
140 | queues every message has a priority which decides about succession | |
141 | of receiving it by a process. If you want to compile and run | |
142 | programs written e.g. for Solaris with use of its POSIX message | |
b0e37650 | 143 | queues (functions mq_*) say Y here. |
1da177e4 LT |
144 | |
145 | POSIX message queues are visible as a filesystem called 'mqueue' | |
146 | and can be mounted somewhere if you want to do filesystem | |
147 | operations on message queues. | |
148 | ||
149 | If unsure, say Y. | |
150 | ||
151 | config BSD_PROCESS_ACCT | |
152 | bool "BSD Process Accounting" | |
153 | help | |
154 | If you say Y here, a user level program will be able to instruct the | |
155 | kernel (via a special system call) to write process accounting | |
156 | information to a file: whenever a process exits, information about | |
157 | that process will be appended to the file by the kernel. The | |
158 | information includes things such as creation time, owning user, | |
159 | command name, memory usage, controlling terminal etc. (the complete | |
160 | list is in the struct acct in <file:include/linux/acct.h>). It is | |
161 | up to the user level program to do useful things with this | |
162 | information. This is generally a good idea, so say Y. | |
163 | ||
164 | config BSD_PROCESS_ACCT_V3 | |
165 | bool "BSD Process Accounting version 3 file format" | |
166 | depends on BSD_PROCESS_ACCT | |
167 | default n | |
168 | help | |
169 | If you say Y here, the process accounting information is written | |
170 | in a new file format that also logs the process IDs of each | |
171 | process and it's parent. Note that this file format is incompatible | |
172 | with previous v0/v1/v2 file formats, so you will need updated tools | |
173 | for processing it. A preliminary version of these tools is available | |
37a4c940 | 174 | at <http://www.gnu.org/software/acct/>. |
1da177e4 | 175 | |
c757249a SN |
176 | config TASKSTATS |
177 | bool "Export task/process statistics through netlink (EXPERIMENTAL)" | |
178 | depends on NET | |
179 | default n | |
180 | help | |
181 | Export selected statistics for tasks/processes through the | |
182 | generic netlink interface. Unlike BSD process accounting, the | |
183 | statistics are available during the lifetime of tasks/processes as | |
184 | responses to commands. Like BSD accounting, they are sent to user | |
185 | space on task exit. | |
186 | ||
187 | Say N if unsure. | |
188 | ||
ca74e92b SN |
189 | config TASK_DELAY_ACCT |
190 | bool "Enable per-task delay accounting (EXPERIMENTAL)" | |
6f44993f | 191 | depends on TASKSTATS |
ca74e92b SN |
192 | help |
193 | Collect information on time spent by a task waiting for system | |
194 | resources like cpu, synchronous block I/O completion and swapping | |
195 | in pages. Such statistics can help in setting a task's priorities | |
196 | relative to other tasks for cpu, io, rss limits etc. | |
197 | ||
198 | Say N if unsure. | |
199 | ||
18f705f4 AD |
200 | config TASK_XACCT |
201 | bool "Enable extended accounting over taskstats (EXPERIMENTAL)" | |
202 | depends on TASKSTATS | |
203 | help | |
204 | Collect extended task accounting data and send the data | |
205 | to userland for processing over the taskstats interface. | |
206 | ||
207 | Say N if unsure. | |
208 | ||
209 | config TASK_IO_ACCOUNTING | |
210 | bool "Enable per-task storage I/O accounting (EXPERIMENTAL)" | |
211 | depends on TASK_XACCT | |
212 | help | |
213 | Collect information on the number of bytes of storage I/O which this | |
214 | task has caused. | |
215 | ||
216 | Say N if unsure. | |
217 | ||
1da177e4 LT |
218 | config AUDIT |
219 | bool "Auditing support" | |
804a6a49 | 220 | depends on NET |
1da177e4 LT |
221 | 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 | ||
227 | config AUDITSYSCALL | |
228 | bool "Enable system-call auditing support" | |
1322b9de | 229 | depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH) |
1da177e4 LT |
230 | 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, | |
f368c07d AG |
234 | such as SELinux. To use audit's filesystem watch feature, please |
235 | ensure that INOTIFY is configured. | |
1da177e4 | 236 | |
74c3cbe3 AV |
237 | config AUDIT_TREE |
238 | def_bool y | |
239 | depends on AUDITSYSCALL && INOTIFY | |
240 | ||
1da177e4 | 241 | config IKCONFIG |
f2443ab6 | 242 | tristate "Kernel .config support" |
1da177e4 LT |
243 | ---help--- |
244 | This option enables the complete Linux kernel ".config" file | |
245 | contents to be saved in the kernel. It provides documentation | |
246 | of which kernel options are used in a running kernel or in an | |
247 | on-disk kernel. This information can be extracted from the kernel | |
248 | image file with the script scripts/extract-ikconfig and used as | |
249 | input to rebuild the current kernel or to build another kernel. | |
250 | It can also be extracted from a running kernel by reading | |
251 | /proc/config.gz if enabled (below). | |
252 | ||
253 | config IKCONFIG_PROC | |
254 | bool "Enable access to .config through /proc/config.gz" | |
255 | depends on IKCONFIG && PROC_FS | |
256 | ---help--- | |
257 | This option enables access to the kernel configuration file | |
258 | through /proc/config.gz. | |
259 | ||
794543a2 AJS |
260 | config LOG_BUF_SHIFT |
261 | int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" | |
262 | range 12 21 | |
f17a32e9 | 263 | default 17 |
794543a2 AJS |
264 | help |
265 | Select kernel log buffer size as a power of 2. | |
f17a32e9 AB |
266 | Examples: |
267 | 17 => 128 KB | |
268 | 16 => 64 KB | |
269 | 15 => 32 KB | |
270 | 14 => 16 KB | |
794543a2 AJS |
271 | 13 => 8 KB |
272 | 12 => 4 KB | |
273 | ||
ddbcc7e8 PM |
274 | config CGROUPS |
275 | bool "Control Group support" | |
276 | help | |
277 | This option will let you use process cgroup subsystems | |
278 | such as Cpusets | |
279 | ||
280 | Say N if unsure. | |
281 | ||
006cb992 PM |
282 | config CGROUP_DEBUG |
283 | bool "Example debug cgroup subsystem" | |
284 | depends on CGROUPS | |
418d7d87 | 285 | default n |
006cb992 PM |
286 | help |
287 | This option enables a simple cgroup subsystem that | |
288 | exports useful debugging information about the cgroups | |
289 | framework | |
290 | ||
291 | Say N if unsure | |
292 | ||
858d72ea SH |
293 | config CGROUP_NS |
294 | bool "Namespace cgroup subsystem" | |
295 | depends on CGROUPS | |
296 | help | |
297 | Provides a simple namespace cgroup subsystem to | |
298 | provide hierarchical naming of sets of namespaces, | |
299 | for instance virtual servers and checkpoint/restart | |
300 | jobs. | |
301 | ||
dc52ddc0 MH |
302 | config CGROUP_FREEZER |
303 | bool "control group freezer subsystem" | |
304 | depends on CGROUPS | |
305 | help | |
306 | Provides a way to freeze and unfreeze all tasks in a | |
307 | cgroup. | |
308 | ||
08ce5f16 SH |
309 | config CGROUP_DEVICE |
310 | bool "Device controller for cgroups" | |
311 | depends on CGROUPS && EXPERIMENTAL | |
312 | help | |
313 | Provides a cgroup implementing whitelists for devices which | |
314 | a process in the cgroup can mknod or open. | |
315 | ||
1da177e4 LT |
316 | config CPUSETS |
317 | bool "Cpuset support" | |
8793d854 | 318 | depends on SMP && CGROUPS |
1da177e4 | 319 | help |
d9fd8a6d | 320 | This option will let you create and manage CPUSETs which |
1da177e4 LT |
321 | allow dynamically partitioning a system into sets of CPUs and |
322 | Memory Nodes and assigning tasks to run only within those sets. | |
323 | This is primarily useful on large SMP or NUMA systems. | |
324 | ||
325 | Say N if unsure. | |
326 | ||
a5574cf6 IM |
327 | # |
328 | # Architectures with an unreliable sched_clock() should select this: | |
329 | # | |
330 | config HAVE_UNSTABLE_SCHED_CLOCK | |
331 | bool | |
332 | ||
052f1dc7 PZ |
333 | config GROUP_SCHED |
334 | bool "Group CPU scheduler" | |
aac6abca PW |
335 | depends on EXPERIMENTAL |
336 | default n | |
29f59db3 | 337 | help |
fb615581 | 338 | This feature lets CPU scheduler recognize task groups and control CPU |
9b5b7751 | 339 | bandwidth allocation to such task groups. |
29f59db3 | 340 | |
052f1dc7 PZ |
341 | config FAIR_GROUP_SCHED |
342 | bool "Group scheduling for SCHED_OTHER" | |
343 | depends on GROUP_SCHED | |
aac6abca | 344 | default GROUP_SCHED |
052f1dc7 PZ |
345 | |
346 | config RT_GROUP_SCHED | |
347 | bool "Group scheduling for SCHED_RR/FIFO" | |
348 | depends on EXPERIMENTAL | |
349 | depends on GROUP_SCHED | |
350 | default n | |
b9b158fe VR |
351 | help |
352 | This feature lets you explicitly allocate real CPU bandwidth | |
353 | to users or control groups (depending on the "Basis for grouping tasks" | |
354 | setting below. If enabled, it will also make it impossible to | |
355 | schedule realtime tasks for non-root users until you allocate | |
356 | realtime bandwidth for them. | |
357 | See Documentation/sched-rt-group.txt for more information. | |
052f1dc7 | 358 | |
24e377a8 | 359 | choice |
052f1dc7 | 360 | depends on GROUP_SCHED |
24e377a8 | 361 | prompt "Basis for grouping tasks" |
052f1dc7 | 362 | default USER_SCHED |
24e377a8 | 363 | |
052f1dc7 | 364 | config USER_SCHED |
fb615581 SV |
365 | bool "user id" |
366 | help | |
367 | This option will choose userid as the basis for grouping | |
368 | tasks, thus providing equal CPU bandwidth to each user. | |
24e377a8 | 369 | |
052f1dc7 | 370 | config CGROUP_SCHED |
68318b8e SV |
371 | bool "Control groups" |
372 | depends on CGROUPS | |
373 | help | |
374 | This option allows you to create arbitrary task groups | |
375 | using the "cgroup" pseudo filesystem and control | |
376 | the cpu bandwidth allocated to each such task group. | |
377 | Refer to Documentation/cgroups.txt for more information | |
378 | on "cgroup" pseudo filesystem. | |
379 | ||
24e377a8 SV |
380 | endchoice |
381 | ||
d842de87 SV |
382 | config CGROUP_CPUACCT |
383 | bool "Simple CPU accounting cgroup subsystem" | |
384 | depends on CGROUPS | |
385 | help | |
386 | Provides a simple Resource Controller for monitoring the | |
387 | total CPU consumed by the tasks in a cgroup | |
388 | ||
e552b661 PE |
389 | config RESOURCE_COUNTERS |
390 | bool "Resource counters" | |
391 | help | |
392 | This option enables controller independent resource accounting | |
393 | infrastructure that works with cgroups | |
394 | depends on CGROUPS | |
395 | ||
cf475ad2 BS |
396 | config MM_OWNER |
397 | bool | |
398 | ||
00f0b825 BS |
399 | config CGROUP_MEM_RES_CTLR |
400 | bool "Memory Resource Controller for Control Groups" | |
401 | depends on CGROUPS && RESOURCE_COUNTERS | |
cf475ad2 | 402 | select MM_OWNER |
00f0b825 | 403 | help |
84ad6d70 KH |
404 | Provides a memory resource controller that manages both anonymous |
405 | memory and page cache. (See Documentation/controllers/memory.txt) | |
00f0b825 BS |
406 | |
407 | Note that setting this option increases fixed memory overhead | |
84ad6d70 KH |
408 | associated with each page of memory in the system. By this, |
409 | 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory | |
410 | usage tracking struct at boot. Total amount of this is printed out | |
411 | at boot. | |
00f0b825 BS |
412 | |
413 | Only enable when you're ok with these trade offs and really | |
84ad6d70 KH |
414 | sure you need the memory resource controller. Even when you enable |
415 | this, you can set "cgroup_disable=memory" at your boot option to | |
416 | disable memory resource controller and you can avoid overheads. | |
417 | (and lose benefits of memory resource contoller) | |
00f0b825 | 418 | |
cf475ad2 BS |
419 | This config option also selects MM_OWNER config option, which |
420 | could in turn add some fork/exit overhead. | |
421 | ||
88a22c98 | 422 | config SYSFS_DEPRECATED |
d47846c5 IM |
423 | bool |
424 | ||
425 | config SYSFS_DEPRECATED_V2 | |
88a22c98 | 426 | bool "Create deprecated sysfs files" |
9148fe87 | 427 | depends on SYSFS |
88a22c98 | 428 | default y |
d47846c5 | 429 | select SYSFS_DEPRECATED |
88a22c98 KS |
430 | help |
431 | This option creates deprecated symlinks such as the | |
432 | "device"-link, the <subsystem>:<name>-link, and the | |
433 | "bus"-link. It may also add deprecated key in the | |
434 | uevent environment. | |
435 | None of these features or values should be used today, as | |
436 | they export driver core implementation details to userspace | |
437 | or export properties which can't be kept stable across kernel | |
438 | releases. | |
439 | ||
440 | If enabled, this option will also move any device structures | |
3dde6ad8 | 441 | that belong to a class, back into the /sys/class hierarchy, in |
024440d2 GKH |
442 | order to support older versions of udev and some userspace |
443 | programs. | |
88a22c98 | 444 | |
024440d2 GKH |
445 | If you are using a distro with the most recent userspace |
446 | packages, it should be safe to say N here. | |
88a22c98 | 447 | |
8793d854 PM |
448 | config PROC_PID_CPUSET |
449 | bool "Include legacy /proc/<pid>/cpuset file" | |
450 | depends on CPUSETS | |
451 | default y | |
452 | ||
b86ff981 JA |
453 | config RELAY |
454 | bool "Kernel->user space relay support (formerly relayfs)" | |
455 | help | |
456 | This option enables support for relay interface support in | |
457 | certain file systems (such as debugfs). | |
458 | It is designed to provide an efficient mechanism for tools and | |
459 | facilities to relay large amounts of data from kernel space to | |
460 | user space. | |
461 | ||
462 | If unsure, say N. | |
463 | ||
c5289a69 PE |
464 | config NAMESPACES |
465 | bool "Namespaces support" if EMBEDDED | |
466 | default !EMBEDDED | |
467 | help | |
468 | Provides the way to make tasks work with different objects using | |
469 | the same id. For example same IPC id may refer to different objects | |
470 | or same user id or pid may refer to different tasks when used in | |
471 | different namespaces. | |
472 | ||
58bfdd6d PE |
473 | config UTS_NS |
474 | bool "UTS namespace" | |
475 | depends on NAMESPACES | |
476 | help | |
477 | In this namespace tasks see different info provided with the | |
478 | uname() system call | |
479 | ||
ae5e1b22 PE |
480 | config IPC_NS |
481 | bool "IPC namespace" | |
482 | depends on NAMESPACES && SYSVIPC | |
483 | help | |
484 | In this namespace tasks work with IPC ids which correspond to | |
485 | different IPC objects in different namespaces | |
486 | ||
aee16ce7 PE |
487 | config USER_NS |
488 | bool "User namespace (EXPERIMENTAL)" | |
489 | depends on NAMESPACES && EXPERIMENTAL | |
490 | help | |
491 | This allows containers, i.e. vservers, to use user namespaces | |
492 | to provide different user info for different servers. | |
493 | If unsure, say N. | |
494 | ||
74bd59bb PE |
495 | config PID_NS |
496 | bool "PID Namespaces (EXPERIMENTAL)" | |
497 | default n | |
498 | depends on NAMESPACES && EXPERIMENTAL | |
499 | help | |
12d2b8f9 | 500 | Support process id namespaces. This allows having multiple |
74bd59bb PE |
501 | process with the same pid as long as they are in different |
502 | pid namespaces. This is a building block of containers. | |
503 | ||
504 | Unless you want to work with an experimental feature | |
505 | say N here. | |
506 | ||
f991633d DG |
507 | config BLK_DEV_INITRD |
508 | bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support" | |
509 | depends on BROKEN || !FRV | |
510 | help | |
511 | The initial RAM filesystem is a ramfs which is loaded by the | |
512 | boot loader (loadlin or lilo) and that is mounted as root | |
513 | before the normal boot procedure. It is typically used to | |
514 | load modules needed to mount the "real" root file system, | |
515 | etc. See <file:Documentation/initrd.txt> for details. | |
516 | ||
517 | If RAM disk support (BLK_DEV_RAM) is also included, this | |
518 | also enables initial RAM disk (initrd) support and adds | |
519 | 15 Kbytes (more on some other architectures) to the kernel size. | |
520 | ||
521 | If unsure say Y. | |
522 | ||
c33df4ea JPS |
523 | if BLK_DEV_INITRD |
524 | ||
dbec4866 SR |
525 | source "usr/Kconfig" |
526 | ||
c33df4ea JPS |
527 | endif |
528 | ||
c45b4f1f | 529 | config CC_OPTIMIZE_FOR_SIZE |
96fffeb4 | 530 | bool "Optimize for size" |
c45b4f1f | 531 | default y |
c45b4f1f LT |
532 | help |
533 | Enabling this option will pass "-Os" instead of "-O2" to gcc | |
534 | resulting in a smaller kernel. | |
535 | ||
775a7229 | 536 | If unsure, say Y. |
c45b4f1f | 537 | |
0847062a RD |
538 | config SYSCTL |
539 | bool | |
540 | ||
1da177e4 LT |
541 | menuconfig EMBEDDED |
542 | bool "Configure standard kernel features (for small systems)" | |
543 | help | |
544 | This option allows certain base kernel options and settings | |
545 | to be disabled or tweaked. This is for specialized | |
546 | environments which can tolerate a "non-standard" kernel. | |
547 | Only use this if you really know what you are doing. | |
548 | ||
ae81f9e3 CE |
549 | config UID16 |
550 | bool "Enable 16-bit UID system calls" if EMBEDDED | |
09337f50 | 551 | depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION) |
ae81f9e3 CE |
552 | default y |
553 | help | |
554 | This enables the legacy 16-bit UID syscall wrappers. | |
555 | ||
b89a8171 | 556 | config SYSCTL_SYSCALL |
0847062a | 557 | bool "Sysctl syscall support" if EMBEDDED |
13bb7e37 | 558 | default y |
b89a8171 | 559 | select SYSCTL |
ae81f9e3 | 560 | ---help--- |
13bb7e37 EB |
561 | sys_sysctl uses binary paths that have been found challenging |
562 | to properly maintain and use. The interface in /proc/sys | |
563 | using paths with ascii names is now the primary path to this | |
564 | information. | |
b89a8171 | 565 | |
13bb7e37 EB |
566 | Almost nothing using the binary sysctl interface so if you are |
567 | trying to save some space it is probably safe to disable this, | |
568 | making your kernel marginally smaller. | |
b89a8171 | 569 | |
13bb7e37 | 570 | If unsure say Y here. |
ae81f9e3 | 571 | |
1da177e4 | 572 | config KALLSYMS |
979c6a1e | 573 | bool "Load all symbols for debugging/ksymoops" if EMBEDDED |
1da177e4 LT |
574 | default y |
575 | help | |
576 | Say Y here to let the kernel print out symbolic crash information and | |
577 | symbolic stack backtraces. This increases the size of the kernel | |
578 | somewhat, as all symbols have to be loaded into the kernel image. | |
579 | ||
580 | config KALLSYMS_ALL | |
581 | bool "Include all symbols in kallsyms" | |
582 | depends on DEBUG_KERNEL && KALLSYMS | |
583 | help | |
584 | Normally kallsyms only contains the symbols of functions, for nicer | |
585 | OOPS messages. Some debuggers can use kallsyms for other | |
f9f97bc0 JJ |
586 | symbols too: say Y here to include all symbols, if you need them |
587 | and you don't care about adding 300k to the size of your kernel. | |
1da177e4 LT |
588 | |
589 | Say N. | |
590 | ||
591 | config KALLSYMS_EXTRA_PASS | |
592 | bool "Do an extra kallsyms pass" | |
593 | depends on KALLSYMS | |
594 | help | |
595 | If kallsyms is not working correctly, the build will fail with | |
596 | inconsistent kallsyms data. If that occurs, log a bug report and | |
597 | turn on KALLSYMS_EXTRA_PASS which should result in a stable build. | |
598 | Always say N here unless you find a bug in kallsyms, which must be | |
599 | reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while | |
600 | you wait for kallsyms to be fixed. | |
601 | ||
d59745ce | 602 | |
712f47ce GKH |
603 | config HOTPLUG |
604 | bool "Support for hot-pluggable devices" if EMBEDDED | |
605 | default y | |
606 | help | |
607 | This option is provided for the case where no hotplug or uevent | |
608 | capabilities is wanted by the kernel. You should only consider | |
609 | disabling this option for embedded systems that do not use modules, a | |
610 | dynamic /dev tree, or dynamic device discovery. Just say Y. | |
611 | ||
d59745ce MM |
612 | config PRINTK |
613 | default y | |
614 | bool "Enable support for printk" if EMBEDDED | |
615 | help | |
616 | This option enables normal printk support. Removing it | |
617 | eliminates most of the message strings from the kernel image | |
618 | and makes the kernel more or less silent. As this makes it | |
619 | very difficult to diagnose system problems, saying N here is | |
620 | strongly discouraged. | |
621 | ||
c8538a7a MM |
622 | config BUG |
623 | bool "BUG() support" if EMBEDDED | |
624 | default y | |
625 | help | |
626 | Disabling this option eliminates support for BUG and WARN, reducing | |
627 | the size of your kernel image and potentially quietly ignoring | |
628 | numerous fatal conditions. You should only consider disabling this | |
629 | option for embedded systems with no facilities for reporting errors. | |
630 | Just say Y. | |
631 | ||
708e9a79 MM |
632 | config ELF_CORE |
633 | default y | |
634 | bool "Enable ELF core dumps" if EMBEDDED | |
635 | help | |
636 | Enable support for generating core dumps. Disabling saves about 4k. | |
637 | ||
e5e1d3cb SS |
638 | config PCSPKR_PLATFORM |
639 | bool "Enable PC-Speaker support" if EMBEDDED | |
640 | depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES | |
641 | default y | |
642 | help | |
643 | This option allows to disable the internal PC-Speaker | |
644 | support, saving some memory. | |
645 | ||
32a93233 IM |
646 | config COMPAT_BRK |
647 | bool "Disable heap randomization" | |
648 | default y | |
649 | help | |
650 | Randomizing heap placement makes heap exploits harder, but it | |
651 | also breaks ancient binaries (including anything libc5 based). | |
652 | This option changes the bootup default to heap randomization | |
653 | disabled, and can be overriden runtime by setting | |
654 | /proc/sys/kernel/randomize_va_space to 2. | |
655 | ||
166124fd | 656 | On non-ancient distros (post-2000 ones) N is usually a safe choice. |
32a93233 | 657 | |
1da177e4 LT |
658 | config BASE_FULL |
659 | default y | |
660 | bool "Enable full-sized data structures for core" if EMBEDDED | |
661 | help | |
662 | Disabling this option reduces the size of miscellaneous core | |
663 | kernel data structures. This saves memory on small machines, | |
664 | but may reduce performance. | |
665 | ||
666 | config FUTEX | |
667 | bool "Enable futex support" if EMBEDDED | |
668 | default y | |
23f78d4a | 669 | select RT_MUTEXES |
1da177e4 LT |
670 | help |
671 | Disabling this option will cause the kernel to be built without | |
672 | support for "fast userspace mutexes". The resulting kernel may not | |
673 | run glibc-based applications correctly. | |
674 | ||
5dc8bf81 | 675 | config ANON_INODES |
448e3cee | 676 | bool |
5dc8bf81 | 677 | |
1da177e4 LT |
678 | config EPOLL |
679 | bool "Enable eventpoll support" if EMBEDDED | |
680 | default y | |
448e3cee | 681 | select ANON_INODES |
1da177e4 LT |
682 | help |
683 | Disabling this option will cause the kernel to be built without | |
684 | support for epoll family of system calls. | |
685 | ||
fba2afaa DL |
686 | config SIGNALFD |
687 | bool "Enable signalfd() system call" if EMBEDDED | |
448e3cee | 688 | select ANON_INODES |
fba2afaa DL |
689 | default y |
690 | help | |
691 | Enable the signalfd() system call that allows to receive signals | |
692 | on a file descriptor. | |
693 | ||
694 | If unsure, say Y. | |
695 | ||
b215e283 DL |
696 | config TIMERFD |
697 | bool "Enable timerfd() system call" if EMBEDDED | |
448e3cee | 698 | select ANON_INODES |
b215e283 DL |
699 | default y |
700 | help | |
701 | Enable the timerfd() system call that allows to receive timer | |
702 | events on a file descriptor. | |
703 | ||
704 | If unsure, say Y. | |
705 | ||
e1ad7468 DL |
706 | config EVENTFD |
707 | bool "Enable eventfd() system call" if EMBEDDED | |
448e3cee | 708 | select ANON_INODES |
e1ad7468 DL |
709 | default y |
710 | help | |
711 | Enable the eventfd() system call that allows to receive both | |
712 | kernel notification (ie. KAIO) or userspace notifications. | |
713 | ||
714 | If unsure, say Y. | |
715 | ||
1da177e4 LT |
716 | config SHMEM |
717 | bool "Use full shmem filesystem" if EMBEDDED | |
718 | default y | |
719 | depends on MMU | |
720 | help | |
721 | The shmem is an internal filesystem used to manage shared memory. | |
722 | It is backed by swap and manages resource limits. It is also exported | |
723 | to userspace as tmpfs if TMPFS is enabled. Disabling this | |
724 | option replaces shmem and tmpfs with the much simpler ramfs code, | |
725 | which may be appropriate on small systems without swap. | |
726 | ||
ebf3f09c TP |
727 | config AIO |
728 | bool "Enable AIO support" if EMBEDDED | |
729 | default y | |
730 | help | |
731 | This option enables POSIX asynchronous I/O which may by used | |
732 | by some high performance threaded applications. Disabling | |
733 | this option saves about 7k. | |
734 | ||
f8891e5e CL |
735 | config VM_EVENT_COUNTERS |
736 | default y | |
737 | bool "Enable VM event counters for /proc/vmstat" if EMBEDDED | |
738 | help | |
2aea4fb6 PJ |
739 | VM event counters are needed for event counts to be shown. |
740 | This option allows the disabling of the VM event counters | |
741 | on EMBEDDED systems. /proc/vmstat will only show page counts | |
742 | if VM event counters are disabled. | |
f8891e5e | 743 | |
3d137310 TP |
744 | config PCI_QUIRKS |
745 | default y | |
61cfc7e4 GU |
746 | bool "Enable PCI quirk workarounds" if EMBEDDED |
747 | depends on PCI | |
3d137310 TP |
748 | help |
749 | This enables workarounds for various PCI chipset | |
750 | bugs/quirks. Disable this only if your target machine is | |
751 | unaffected by PCI quirks. | |
752 | ||
41ecc55b CL |
753 | config SLUB_DEBUG |
754 | default y | |
755 | bool "Enable SLUB debugging support" if EMBEDDED | |
f6acb635 | 756 | depends on SLUB && SYSFS |
41ecc55b CL |
757 | help |
758 | SLUB has extensive debug support features. Disabling these can | |
759 | result in significant savings in code size. This also disables | |
760 | SLUB sysfs support. /sys/slab will not exist and there will be | |
761 | no support for cache validation etc. | |
762 | ||
81819f0f CL |
763 | choice |
764 | prompt "Choose SLAB allocator" | |
a0acd820 | 765 | default SLUB |
81819f0f CL |
766 | help |
767 | This option allows to select a slab allocator. | |
768 | ||
769 | config SLAB | |
770 | bool "SLAB" | |
771 | help | |
772 | The regular slab allocator that is established and known to work | |
34013886 | 773 | well in all environments. It organizes cache hot objects in |
81819f0f | 774 | per cpu and per node queues. SLAB is the default choice for |
34013886 | 775 | a slab allocator. |
81819f0f CL |
776 | |
777 | config SLUB | |
81819f0f CL |
778 | bool "SLUB (Unqueued Allocator)" |
779 | help | |
780 | SLUB is a slab allocator that minimizes cache line usage | |
781 | instead of managing queues of cached objects (SLAB approach). | |
782 | Per cpu caching is realized using slabs of objects instead | |
783 | of queues of objects. SLUB can use memory efficiently | |
34013886 | 784 | and has enhanced diagnostics. |
81819f0f CL |
785 | |
786 | config SLOB | |
84a01c2f | 787 | depends on EMBEDDED |
81819f0f CL |
788 | bool "SLOB (Simple Allocator)" |
789 | help | |
37291458 MM |
790 | SLOB replaces the stock allocator with a drastically simpler |
791 | allocator. SLOB is generally more space efficient but | |
792 | does not perform as well on large systems. | |
81819f0f CL |
793 | |
794 | endchoice | |
795 | ||
125e5645 MD |
796 | config PROFILING |
797 | bool "Profiling support (EXPERIMENTAL)" | |
798 | help | |
799 | Say Y here to enable the extended profiling support mechanisms used | |
800 | by profilers such as OProfile. | |
801 | ||
5f87f112 IM |
802 | # |
803 | # Place an empty function call at each tracepoint site. Can be | |
804 | # dynamically changed for a probe function. | |
805 | # | |
97e1c18e | 806 | config TRACEPOINTS |
5f87f112 | 807 | bool |
97e1c18e | 808 | |
125e5645 MD |
809 | config MARKERS |
810 | bool "Activate markers" | |
811 | help | |
812 | Place an empty function call at each marker site. Can be | |
813 | dynamically changed for a probe function. | |
814 | ||
fb32e03f MD |
815 | source "arch/Kconfig" |
816 | ||
1da177e4 LT |
817 | endmenu # General setup |
818 | ||
ee7e5516 DB |
819 | config HAVE_GENERIC_DMA_COHERENT |
820 | bool | |
821 | default n | |
822 | ||
158a9624 LT |
823 | config SLABINFO |
824 | bool | |
825 | depends on PROC_FS | |
0f389ec6 | 826 | depends on SLAB || SLUB_DEBUG |
158a9624 LT |
827 | default y |
828 | ||
ae81f9e3 CE |
829 | config RT_MUTEXES |
830 | boolean | |
831 | select PLIST | |
832 | ||
1da177e4 LT |
833 | config TINY_SHMEM |
834 | default !SHMEM | |
835 | bool | |
836 | ||
837 | config BASE_SMALL | |
838 | int | |
839 | default 0 if BASE_FULL | |
840 | default 1 if !BASE_FULL | |
841 | ||
66da5733 | 842 | menuconfig MODULES |
1da177e4 LT |
843 | bool "Enable loadable module support" |
844 | help | |
845 | Kernel modules are small pieces of compiled code which can | |
846 | be inserted in the running kernel, rather than being | |
847 | permanently built into the kernel. You use the "modprobe" | |
848 | tool to add (and sometimes remove) them. If you say Y here, | |
849 | many parts of the kernel can be built as modules (by | |
850 | answering M instead of Y where indicated): this is most | |
851 | useful for infrequently used options which are not required | |
852 | for booting. For more information, see the man pages for | |
853 | modprobe, lsmod, modinfo, insmod and rmmod. | |
854 | ||
855 | If you say Y here, you will need to run "make | |
856 | modules_install" to put the modules under /lib/modules/ | |
857 | where modprobe can find them (you may need to be root to do | |
858 | this). | |
859 | ||
860 | If unsure, say Y. | |
861 | ||
0b0de144 RD |
862 | if MODULES |
863 | ||
826e4506 LT |
864 | config MODULE_FORCE_LOAD |
865 | bool "Forced module loading" | |
826e4506 LT |
866 | default n |
867 | help | |
91e37a79 RR |
868 | Allow loading of modules without version information (ie. modprobe |
869 | --force). Forced module loading sets the 'F' (forced) taint flag and | |
870 | is usually a really bad idea. | |
826e4506 | 871 | |
1da177e4 LT |
872 | config MODULE_UNLOAD |
873 | bool "Module unloading" | |
1da177e4 LT |
874 | help |
875 | Without this option you will not be able to unload any | |
876 | modules (note that some modules may not be unloadable | |
f7f5b675 DV |
877 | anyway), which makes your kernel smaller, faster |
878 | and simpler. If unsure, say Y. | |
1da177e4 LT |
879 | |
880 | config MODULE_FORCE_UNLOAD | |
881 | bool "Forced module unloading" | |
882 | depends on MODULE_UNLOAD && EXPERIMENTAL | |
883 | help | |
884 | This option allows you to force a module to unload, even if the | |
885 | kernel believes it is unsafe: the kernel will remove the module | |
886 | without waiting for anyone to stop using it (using the -f option to | |
887 | rmmod). This is mainly for kernel developers and desperate users. | |
888 | If unsure, say N. | |
889 | ||
1da177e4 | 890 | config MODVERSIONS |
0d541643 | 891 | bool "Module versioning support" |
1da177e4 LT |
892 | help |
893 | Usually, you have to use modules compiled with your kernel. | |
894 | Saying Y here makes it sometimes possible to use modules | |
895 | compiled for different kernels, by adding enough information | |
896 | to the modules to (hopefully) spot any changes which would | |
897 | make them incompatible with the kernel you are running. If | |
898 | unsure, say N. | |
899 | ||
900 | config MODULE_SRCVERSION_ALL | |
901 | bool "Source checksum for all modules" | |
1da177e4 LT |
902 | help |
903 | Modules which contain a MODULE_VERSION get an extra "srcversion" | |
904 | field inserted into their modinfo section, which contains a | |
905 | sum of the source files which made it. This helps maintainers | |
906 | see exactly which source was used to build a module (since | |
907 | others sometimes change the module source without updating | |
908 | the version). With this option, such a "srcversion" field | |
909 | will be created for all modules. If unsure, say N. | |
910 | ||
911 | config KMOD | |
baabaae9 | 912 | def_bool y |
1da177e4 | 913 | help |
baabaae9 JB |
914 | This is being removed soon. These days, CONFIG_MODULES |
915 | implies CONFIG_KMOD, so use that instead. | |
1da177e4 | 916 | |
0b0de144 RD |
917 | endif # MODULES |
918 | ||
1da177e4 LT |
919 | config STOP_MACHINE |
920 | bool | |
921 | default y | |
922 | depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU | |
923 | help | |
924 | Need stop_machine() primitive. | |
3a65dfe8 | 925 | |
3a65dfe8 | 926 | source "block/Kconfig" |
e98c3202 AK |
927 | |
928 | config PREEMPT_NOTIFIERS | |
929 | bool | |
e260be67 | 930 | |
e260be67 | 931 | config CLASSIC_RCU |
21bbb39c | 932 | def_bool !PREEMPT_RCU |
e260be67 PM |
933 | help |
934 | This option selects the classic RCU implementation that is | |
935 | designed for best read-side performance on non-realtime | |
21bbb39c PM |
936 | systems. Classic RCU is the default. Note that the |
937 | PREEMPT_RCU symbol is used to select/deselect this option. |