Roman Zippel | 80daa56 | 2008-01-14 04:51:16 +0100 | [diff] [blame] | 1 | config ARCH |
| 2 | string |
| 3 | option env="ARCH" |
| 4 | |
| 5 | config KERNELVERSION |
| 6 | string |
| 7 | option env="KERNELVERSION" |
| 8 | |
Roman Zippel | face437 | 2006-06-08 22:12:45 -0700 | [diff] [blame] | 9 | config DEFCONFIG_LIST |
| 10 | string |
Paolo 'Blaisorblade' Giarrusso | b2670ea | 2006-10-19 23:28:23 -0700 | [diff] [blame] | 11 | depends on !UML |
Roman Zippel | face437 | 2006-06-08 22:12:45 -0700 | [diff] [blame] | 12 | option defconfig_list |
| 13 | default "/lib/modules/$UNAME_RELEASE/.config" |
| 14 | default "/etc/kernel-config" |
| 15 | default "/boot/config-$UNAME_RELEASE" |
| 16 | default "arch/$ARCH/defconfig" |
| 17 | |
Al Boldi | ff0cfc6 | 2007-07-31 00:39:23 -0700 | [diff] [blame] | 18 | menu "General setup" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | config EXPERIMENTAL |
| 21 | bool "Prompt for development and/or incomplete code/drivers" |
| 22 | ---help--- |
| 23 | Some of the various things that Linux supports (such as network |
| 24 | drivers, file systems, network protocols, etc.) can be in a state |
| 25 | of development where the functionality, stability, or the level of |
| 26 | testing is not yet high enough for general use. This is usually |
| 27 | known as the "alpha-test" phase among developers. If a feature is |
| 28 | currently in alpha-test, then the developers usually discourage |
| 29 | uninformed widespread use of this feature by the general public to |
| 30 | avoid "Why doesn't this work?" type mail messages. However, active |
| 31 | testing and use of these systems is welcomed. Just be aware that it |
| 32 | may not meet the normal level of reliability or it may fail to work |
| 33 | in some special cases. Detailed bug reports from people familiar |
| 34 | with the kernel internals are usually welcomed by the developers |
| 35 | (before submitting bug reports, please read the documents |
| 36 | <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>, |
| 37 | <file:Documentation/BUG-HUNTING>, and |
| 38 | <file:Documentation/oops-tracing.txt> in the kernel source). |
| 39 | |
| 40 | This option will also make obsoleted drivers available. These are |
| 41 | drivers that have been replaced by something else, and/or are |
| 42 | scheduled to be removed in a future kernel release. |
| 43 | |
| 44 | Unless you intend to help test and develop a feature or driver that |
| 45 | falls into this category, or you have a situation that requires |
| 46 | using these features, you should probably say N here, which will |
| 47 | cause the configurator to present you with fewer choices. If |
| 48 | you say Y here, you will be offered the choice of using features or |
| 49 | drivers that are currently considered to be in the alpha-test phase. |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | config BROKEN |
| 52 | bool |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
| 54 | config BROKEN_ON_SMP |
| 55 | bool |
| 56 | depends on BROKEN || !SMP |
| 57 | default y |
| 58 | |
| 59 | config LOCK_KERNEL |
| 60 | bool |
| 61 | depends on SMP || PREEMPT |
| 62 | default y |
| 63 | |
| 64 | config INIT_ENV_ARG_LIMIT |
| 65 | int |
Adrian Bunk | dd673bc | 2006-06-30 01:55:51 -0700 | [diff] [blame] | 66 | default 32 if !UML |
| 67 | default 128 if UML |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | help |
Randy Dunlap | 34ad92c | 2005-10-30 15:01:46 -0800 | [diff] [blame] | 69 | Maximum of each of the number of arguments and environment |
| 70 | variables passed to init from the kernel command line. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | config LOCALVERSION |
| 74 | string "Local version - append to kernel release" |
| 75 | help |
| 76 | Append an extra string to the end of your kernel version. |
| 77 | This will show up when you type uname, for example. |
| 78 | The string you set here will be appended after the contents of |
| 79 | any files with a filename matching localversion* in your |
| 80 | object and source tree, in that order. Your total string can |
| 81 | be a maximum of 64 characters. |
| 82 | |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 83 | config LOCALVERSION_AUTO |
| 84 | bool "Automatically append version information to the version string" |
| 85 | default y |
| 86 | help |
| 87 | This will try to automatically determine if the current tree is a |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 88 | release tree by looking for git tags that belong to the current |
| 89 | top of tree revision. |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 90 | |
| 91 | A string of the format -gxxxxxxxx will be added to the localversion |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 92 | if a git-based tree is found. The string generated by this will be |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 93 | appended after any matching localversion* files, and after the value |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 94 | set in CONFIG_LOCALVERSION. |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 95 | |
Robert P. J. Day | 6e5a542 | 2007-05-01 23:08:11 +0200 | [diff] [blame] | 96 | (The actual string used here is the first eight characters produced |
| 97 | by running the command: |
| 98 | |
| 99 | $ git rev-parse --verify HEAD |
| 100 | |
| 101 | which is done within the script "scripts/setlocalversion".) |
Ryan Anderson | aaebf43 | 2005-07-31 04:57:49 -0400 | [diff] [blame] | 102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | config SWAP |
| 104 | bool "Support for paging of anonymous memory (swap)" |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 105 | depends on MMU && BLOCK |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | default y |
| 107 | help |
| 108 | This option allows you to choose whether you want to have support |
Jesper Juhl | 92c3504 | 2006-01-15 02:40:08 +0100 | [diff] [blame] | 109 | for so called swap devices or swap files in your kernel that are |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | used to provide more virtual memory than the actual RAM present |
| 111 | in your computer. If unsure say Y. |
| 112 | |
| 113 | config SYSVIPC |
| 114 | bool "System V IPC" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | ---help--- |
| 116 | Inter Process Communication is a suite of library functions and |
| 117 | system calls which let processes (running programs) synchronize and |
| 118 | exchange information. It is generally considered to be a good thing, |
| 119 | and some programs won't run unless you say Y here. In particular, if |
| 120 | you want to run the DOS emulator dosemu under Linux (read the |
| 121 | DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>), |
| 122 | you'll need to say Y here. |
| 123 | |
| 124 | You can find documentation about IPC with "info ipc" and also in |
| 125 | section 6.4 of the Linux Programmer's Guide, available from |
| 126 | <http://www.tldp.org/guides.html>. |
| 127 | |
Eric W. Biederman | a5494dc | 2007-02-14 00:34:06 -0800 | [diff] [blame] | 128 | config SYSVIPC_SYSCTL |
| 129 | bool |
| 130 | depends on SYSVIPC |
| 131 | depends on SYSCTL |
| 132 | default y |
| 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | config POSIX_MQUEUE |
| 135 | bool "POSIX Message Queues" |
| 136 | depends on NET && EXPERIMENTAL |
| 137 | ---help--- |
| 138 | POSIX variant of message queues is a part of IPC. In POSIX message |
| 139 | queues every message has a priority which decides about succession |
| 140 | of receiving it by a process. If you want to compile and run |
| 141 | programs written e.g. for Solaris with use of its POSIX message |
Robert P. J. Day | b0e3765 | 2007-05-09 07:25:13 +0200 | [diff] [blame] | 142 | queues (functions mq_*) say Y here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
| 144 | POSIX message queues are visible as a filesystem called 'mqueue' |
| 145 | and can be mounted somewhere if you want to do filesystem |
| 146 | operations on message queues. |
| 147 | |
| 148 | If unsure, say Y. |
| 149 | |
| 150 | config BSD_PROCESS_ACCT |
| 151 | bool "BSD Process Accounting" |
| 152 | help |
| 153 | If you say Y here, a user level program will be able to instruct the |
| 154 | kernel (via a special system call) to write process accounting |
| 155 | information to a file: whenever a process exits, information about |
| 156 | that process will be appended to the file by the kernel. The |
| 157 | information includes things such as creation time, owning user, |
| 158 | command name, memory usage, controlling terminal etc. (the complete |
| 159 | list is in the struct acct in <file:include/linux/acct.h>). It is |
| 160 | up to the user level program to do useful things with this |
| 161 | information. This is generally a good idea, so say Y. |
| 162 | |
| 163 | config BSD_PROCESS_ACCT_V3 |
| 164 | bool "BSD Process Accounting version 3 file format" |
| 165 | depends on BSD_PROCESS_ACCT |
| 166 | default n |
| 167 | help |
| 168 | If you say Y here, the process accounting information is written |
| 169 | in a new file format that also logs the process IDs of each |
| 170 | process and it's parent. Note that this file format is incompatible |
| 171 | with previous v0/v1/v2 file formats, so you will need updated tools |
| 172 | for processing it. A preliminary version of these tools is available |
| 173 | at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>. |
| 174 | |
Shailabh Nagar | c757249 | 2006-07-14 00:24:40 -0700 | [diff] [blame] | 175 | config TASKSTATS |
| 176 | bool "Export task/process statistics through netlink (EXPERIMENTAL)" |
| 177 | depends on NET |
| 178 | default n |
| 179 | help |
| 180 | Export selected statistics for tasks/processes through the |
| 181 | generic netlink interface. Unlike BSD process accounting, the |
| 182 | statistics are available during the lifetime of tasks/processes as |
| 183 | responses to commands. Like BSD accounting, they are sent to user |
| 184 | space on task exit. |
| 185 | |
| 186 | Say N if unsure. |
| 187 | |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 188 | config TASK_DELAY_ACCT |
| 189 | bool "Enable per-task delay accounting (EXPERIMENTAL)" |
Shailabh Nagar | 6f44993 | 2006-07-14 00:24:41 -0700 | [diff] [blame] | 190 | depends on TASKSTATS |
Shailabh Nagar | ca74e92 | 2006-07-14 00:24:36 -0700 | [diff] [blame] | 191 | help |
| 192 | Collect information on time spent by a task waiting for system |
| 193 | resources like cpu, synchronous block I/O completion and swapping |
| 194 | in pages. Such statistics can help in setting a task's priorities |
| 195 | relative to other tasks for cpu, io, rss limits etc. |
| 196 | |
| 197 | Say N if unsure. |
| 198 | |
Alexey Dobriyan | 18f705f | 2007-02-10 01:46:44 -0800 | [diff] [blame] | 199 | config TASK_XACCT |
| 200 | bool "Enable extended accounting over taskstats (EXPERIMENTAL)" |
| 201 | depends on TASKSTATS |
| 202 | help |
| 203 | Collect extended task accounting data and send the data |
| 204 | to userland for processing over the taskstats interface. |
| 205 | |
| 206 | Say N if unsure. |
| 207 | |
| 208 | config TASK_IO_ACCOUNTING |
| 209 | bool "Enable per-task storage I/O accounting (EXPERIMENTAL)" |
| 210 | depends on TASK_XACCT |
| 211 | help |
| 212 | Collect information on the number of bytes of storage I/O which this |
| 213 | task has caused. |
| 214 | |
| 215 | Say N if unsure. |
| 216 | |
Cedric Le Goater | acce292 | 2007-07-15 23:40:59 -0700 | [diff] [blame] | 217 | config USER_NS |
| 218 | bool "User Namespaces (EXPERIMENTAL)" |
| 219 | default n |
| 220 | depends on EXPERIMENTAL |
| 221 | help |
| 222 | Support user namespaces. This allows containers, i.e. |
| 223 | vservers, to use user namespaces to provide different |
| 224 | user info for different servers. If unsure, say N. |
| 225 | |
Eric W. Biederman | 57d5f66 | 2007-11-14 17:00:13 -0800 | [diff] [blame] | 226 | config PID_NS |
| 227 | bool "PID Namespaces (EXPERIMENTAL)" |
| 228 | default n |
| 229 | depends on EXPERIMENTAL |
| 230 | help |
| 231 | Suport process id namespaces. This allows having multiple |
| 232 | process with the same pid as long as they are in different |
| 233 | pid namespaces. This is a building block of containers. |
| 234 | |
| 235 | Unless you want to work with an experimental feature |
| 236 | say N here. |
| 237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | config AUDIT |
| 239 | bool "Auditing support" |
Chris Wright | 804a6a4 | 2005-05-11 10:52:45 +0100 | [diff] [blame] | 240 | depends on NET |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | help |
| 242 | Enable auditing infrastructure that can be used with another |
| 243 | kernel subsystem, such as SELinux (which requires this for |
| 244 | logging of avc messages output). Does not do system-call |
| 245 | auditing without CONFIG_AUDITSYSCALL. |
| 246 | |
| 247 | config AUDITSYSCALL |
| 248 | bool "Enable system-call auditing support" |
Yuichi Nakamura | 1322b9d | 2007-11-10 19:21:34 +0900 | [diff] [blame] | 249 | depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | default y if SECURITY_SELINUX |
| 251 | help |
| 252 | Enable low-overhead system-call auditing infrastructure that |
| 253 | can be used independently or with another kernel subsystem, |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 254 | such as SELinux. To use audit's filesystem watch feature, please |
| 255 | ensure that INOTIFY is configured. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 257 | config AUDIT_TREE |
| 258 | def_bool y |
| 259 | depends on AUDITSYSCALL && INOTIFY |
| 260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | config IKCONFIG |
Ross Biro | f2443ab | 2006-09-30 23:27:25 -0700 | [diff] [blame] | 262 | tristate "Kernel .config support" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | ---help--- |
| 264 | This option enables the complete Linux kernel ".config" file |
| 265 | contents to be saved in the kernel. It provides documentation |
| 266 | of which kernel options are used in a running kernel or in an |
| 267 | on-disk kernel. This information can be extracted from the kernel |
| 268 | image file with the script scripts/extract-ikconfig and used as |
| 269 | input to rebuild the current kernel or to build another kernel. |
| 270 | It can also be extracted from a running kernel by reading |
| 271 | /proc/config.gz if enabled (below). |
| 272 | |
| 273 | config IKCONFIG_PROC |
| 274 | bool "Enable access to .config through /proc/config.gz" |
| 275 | depends on IKCONFIG && PROC_FS |
| 276 | ---help--- |
| 277 | This option enables access to the kernel configuration file |
| 278 | through /proc/config.gz. |
| 279 | |
Alistair John Strachan | 794543a | 2007-05-08 00:31:15 -0700 | [diff] [blame] | 280 | config LOG_BUF_SHIFT |
| 281 | int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" |
| 282 | range 12 21 |
| 283 | default 17 if S390 || LOCKDEP |
| 284 | default 16 if X86_NUMAQ || IA64 |
| 285 | default 15 if SMP |
| 286 | default 14 |
| 287 | help |
| 288 | Select kernel log buffer size as a power of 2. |
| 289 | Defaults and Examples: |
| 290 | 17 => 128 KB for S/390 |
| 291 | 16 => 64 KB for x86 NUMAQ or IA-64 |
| 292 | 15 => 32 KB for SMP |
| 293 | 14 => 16 KB for uniprocessor |
| 294 | 13 => 8 KB |
| 295 | 12 => 4 KB |
| 296 | |
Paul Menage | ddbcc7e | 2007-10-18 23:39:30 -0700 | [diff] [blame] | 297 | config CGROUPS |
| 298 | bool "Control Group support" |
| 299 | help |
| 300 | This option will let you use process cgroup subsystems |
| 301 | such as Cpusets |
| 302 | |
| 303 | Say N if unsure. |
| 304 | |
Paul Menage | 006cb99 | 2007-10-18 23:39:43 -0700 | [diff] [blame] | 305 | config CGROUP_DEBUG |
| 306 | bool "Example debug cgroup subsystem" |
| 307 | depends on CGROUPS |
| 308 | help |
| 309 | This option enables a simple cgroup subsystem that |
| 310 | exports useful debugging information about the cgroups |
| 311 | framework |
| 312 | |
| 313 | Say N if unsure |
| 314 | |
Serge E. Hallyn | 858d72e | 2007-10-18 23:39:45 -0700 | [diff] [blame] | 315 | config CGROUP_NS |
| 316 | bool "Namespace cgroup subsystem" |
| 317 | depends on CGROUPS |
| 318 | help |
| 319 | Provides a simple namespace cgroup subsystem to |
| 320 | provide hierarchical naming of sets of namespaces, |
| 321 | for instance virtual servers and checkpoint/restart |
| 322 | jobs. |
| 323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | config CPUSETS |
| 325 | bool "Cpuset support" |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 326 | depends on SMP && CGROUPS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | help |
Randy Dunlap | d9fd8a6 | 2005-07-27 11:45:11 -0700 | [diff] [blame] | 328 | This option will let you create and manage CPUSETs which |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | allow dynamically partitioning a system into sets of CPUs and |
| 330 | Memory Nodes and assigning tasks to run only within those sets. |
| 331 | This is primarily useful on large SMP or NUMA systems. |
| 332 | |
| 333 | Say N if unsure. |
| 334 | |
Srivatsa Vaddagiri | 29f59db | 2007-10-15 17:00:07 +0200 | [diff] [blame] | 335 | config FAIR_GROUP_SCHED |
Srivatsa Vaddagiri | fb61558 | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 336 | bool "Fair group CPU scheduler" |
Ingo Molnar | de8d585 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 337 | default y |
Srivatsa Vaddagiri | 29f59db | 2007-10-15 17:00:07 +0200 | [diff] [blame] | 338 | help |
Srivatsa Vaddagiri | fb61558 | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 339 | This feature lets CPU scheduler recognize task groups and control CPU |
Srivatsa Vaddagiri | 9b5b775 | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 340 | bandwidth allocation to such task groups. |
Srivatsa Vaddagiri | 29f59db | 2007-10-15 17:00:07 +0200 | [diff] [blame] | 341 | |
Srivatsa Vaddagiri | 24e377a | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 342 | choice |
| 343 | depends on FAIR_GROUP_SCHED |
| 344 | prompt "Basis for grouping tasks" |
| 345 | default FAIR_USER_SCHED |
| 346 | |
Srivatsa Vaddagiri | fb61558 | 2007-10-15 17:00:12 +0200 | [diff] [blame] | 347 | config FAIR_USER_SCHED |
| 348 | bool "user id" |
| 349 | help |
| 350 | This option will choose userid as the basis for grouping |
| 351 | tasks, thus providing equal CPU bandwidth to each user. |
Srivatsa Vaddagiri | 24e377a | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 352 | |
Srivatsa Vaddagiri | 68318b8 | 2007-10-18 23:41:03 -0700 | [diff] [blame] | 353 | config FAIR_CGROUP_SCHED |
| 354 | bool "Control groups" |
| 355 | depends on CGROUPS |
| 356 | help |
| 357 | This option allows you to create arbitrary task groups |
| 358 | using the "cgroup" pseudo filesystem and control |
| 359 | the cpu bandwidth allocated to each such task group. |
| 360 | Refer to Documentation/cgroups.txt for more information |
| 361 | on "cgroup" pseudo filesystem. |
| 362 | |
Srivatsa Vaddagiri | 24e377a | 2007-10-15 17:00:09 +0200 | [diff] [blame] | 363 | endchoice |
| 364 | |
Srivatsa Vaddagiri | d842de8 | 2007-12-02 20:04:49 +0100 | [diff] [blame] | 365 | config CGROUP_CPUACCT |
| 366 | bool "Simple CPU accounting cgroup subsystem" |
| 367 | depends on CGROUPS |
| 368 | help |
| 369 | Provides a simple Resource Controller for monitoring the |
| 370 | total CPU consumed by the tasks in a cgroup |
| 371 | |
Kay Sievers | 88a22c9 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 372 | config SYSFS_DEPRECATED |
| 373 | bool "Create deprecated sysfs files" |
Randy Dunlap | 9148fe8 | 2007-12-31 10:05:34 -0800 | [diff] [blame] | 374 | depends on SYSFS |
Kay Sievers | 88a22c9 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 375 | default y |
| 376 | help |
| 377 | This option creates deprecated symlinks such as the |
| 378 | "device"-link, the <subsystem>:<name>-link, and the |
| 379 | "bus"-link. It may also add deprecated key in the |
| 380 | uevent environment. |
| 381 | None of these features or values should be used today, as |
| 382 | they export driver core implementation details to userspace |
| 383 | or export properties which can't be kept stable across kernel |
| 384 | releases. |
| 385 | |
| 386 | If enabled, this option will also move any device structures |
David Sterba | 3dde6ad | 2007-05-09 07:12:20 +0200 | [diff] [blame] | 387 | that belong to a class, back into the /sys/class hierarchy, in |
Kay Sievers | 88a22c9 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 388 | order to support older versions of udev. |
| 389 | |
| 390 | If you are using a distro that was released in 2006 or later, |
| 391 | it should be safe to say N here. |
| 392 | |
Paul Menage | 8793d85 | 2007-10-18 23:39:39 -0700 | [diff] [blame] | 393 | config PROC_PID_CPUSET |
| 394 | bool "Include legacy /proc/<pid>/cpuset file" |
| 395 | depends on CPUSETS |
| 396 | default y |
| 397 | |
Jens Axboe | b86ff98 | 2006-03-23 19:56:55 +0100 | [diff] [blame] | 398 | config RELAY |
| 399 | bool "Kernel->user space relay support (formerly relayfs)" |
| 400 | help |
| 401 | This option enables support for relay interface support in |
| 402 | certain file systems (such as debugfs). |
| 403 | It is designed to provide an efficient mechanism for tools and |
| 404 | facilities to relay large amounts of data from kernel space to |
| 405 | user space. |
| 406 | |
| 407 | If unsure, say N. |
| 408 | |
Dimitri Gorokhovik | f991633 | 2007-03-06 01:42:17 -0800 | [diff] [blame] | 409 | config BLK_DEV_INITRD |
| 410 | bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support" |
| 411 | depends on BROKEN || !FRV |
| 412 | help |
| 413 | The initial RAM filesystem is a ramfs which is loaded by the |
| 414 | boot loader (loadlin or lilo) and that is mounted as root |
| 415 | before the normal boot procedure. It is typically used to |
| 416 | load modules needed to mount the "real" root file system, |
| 417 | etc. See <file:Documentation/initrd.txt> for details. |
| 418 | |
| 419 | If RAM disk support (BLK_DEV_RAM) is also included, this |
| 420 | also enables initial RAM disk (initrd) support and adds |
| 421 | 15 Kbytes (more on some other architectures) to the kernel size. |
| 422 | |
| 423 | If unsure say Y. |
| 424 | |
Jean-Paul Saman | c33df4e | 2007-02-10 01:44:43 -0800 | [diff] [blame] | 425 | if BLK_DEV_INITRD |
| 426 | |
Sam Ravnborg | dbec486 | 2005-08-10 20:44:50 +0200 | [diff] [blame] | 427 | source "usr/Kconfig" |
| 428 | |
Jean-Paul Saman | c33df4e | 2007-02-10 01:44:43 -0800 | [diff] [blame] | 429 | endif |
| 430 | |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 431 | config CC_OPTIMIZE_FOR_SIZE |
| 432 | bool "Optimize for size (Look out for broken compilers!)" |
| 433 | default y |
Paul Mundt | 32582fa | 2007-07-25 11:27:05 +0900 | [diff] [blame] | 434 | depends on ARM || H8300 || SUPERH || EXPERIMENTAL |
Linus Torvalds | c45b4f1 | 2005-12-14 18:52:21 -0800 | [diff] [blame] | 435 | help |
| 436 | Enabling this option will pass "-Os" instead of "-O2" to gcc |
| 437 | resulting in a smaller kernel. |
| 438 | |
| 439 | WARNING: some versions of gcc may generate incorrect code with this |
| 440 | option. If problems are observed, a gcc upgrade may be needed. |
| 441 | |
| 442 | If unsure, say N. |
| 443 | |
Randy Dunlap | 0847062 | 2006-09-30 23:28:13 -0700 | [diff] [blame] | 444 | config SYSCTL |
| 445 | bool |
| 446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | menuconfig EMBEDDED |
| 448 | bool "Configure standard kernel features (for small systems)" |
| 449 | help |
| 450 | This option allows certain base kernel options and settings |
| 451 | to be disabled or tweaked. This is for specialized |
| 452 | environments which can tolerate a "non-standard" kernel. |
| 453 | Only use this if you really know what you are doing. |
| 454 | |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 455 | config UID16 |
| 456 | bool "Enable 16-bit UID system calls" if EMBEDDED |
Mike Frysinger | 529a73f | 2007-11-23 14:28:44 +0800 | [diff] [blame] | 457 | depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION) |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 458 | default y |
| 459 | help |
| 460 | This enables the legacy 16-bit UID syscall wrappers. |
| 461 | |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 462 | config SYSCTL_SYSCALL |
Randy Dunlap | 0847062 | 2006-09-30 23:28:13 -0700 | [diff] [blame] | 463 | bool "Sysctl syscall support" if EMBEDDED |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 464 | default y |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 465 | select SYSCTL |
| 466 | ---help--- |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 467 | sys_sysctl uses binary paths that have been found challenging |
| 468 | to properly maintain and use. The interface in /proc/sys |
| 469 | using paths with ascii names is now the primary path to this |
| 470 | information. |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 471 | |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 472 | Almost nothing using the binary sysctl interface so if you are |
| 473 | trying to save some space it is probably safe to disable this, |
| 474 | making your kernel marginally smaller. |
Eric W. Biederman | b89a817 | 2006-09-27 01:51:04 -0700 | [diff] [blame] | 475 | |
Eric W. Biederman | 13bb7e3 | 2006-11-08 17:44:51 -0800 | [diff] [blame] | 476 | If unsure say Y here. |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 477 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | config KALLSYMS |
Jesper Juhl | 979c6a1 | 2006-12-12 19:25:11 +0100 | [diff] [blame] | 479 | bool "Load all symbols for debugging/ksymoops" if EMBEDDED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | default y |
| 481 | help |
| 482 | Say Y here to let the kernel print out symbolic crash information and |
| 483 | symbolic stack backtraces. This increases the size of the kernel |
| 484 | somewhat, as all symbols have to be loaded into the kernel image. |
| 485 | |
| 486 | config KALLSYMS_ALL |
| 487 | bool "Include all symbols in kallsyms" |
| 488 | depends on DEBUG_KERNEL && KALLSYMS |
| 489 | help |
| 490 | Normally kallsyms only contains the symbols of functions, for nicer |
| 491 | OOPS messages. Some debuggers can use kallsyms for other |
Jesper Juhl | f9f97bc | 2005-07-20 05:43:05 +0200 | [diff] [blame] | 492 | symbols too: say Y here to include all symbols, if you need them |
| 493 | and you don't care about adding 300k to the size of your kernel. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | |
| 495 | Say N. |
| 496 | |
| 497 | config KALLSYMS_EXTRA_PASS |
| 498 | bool "Do an extra kallsyms pass" |
| 499 | depends on KALLSYMS |
| 500 | help |
| 501 | If kallsyms is not working correctly, the build will fail with |
| 502 | inconsistent kallsyms data. If that occurs, log a bug report and |
| 503 | turn on KALLSYMS_EXTRA_PASS which should result in a stable build. |
| 504 | Always say N here unless you find a bug in kallsyms, which must be |
| 505 | reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while |
| 506 | you wait for kallsyms to be fixed. |
| 507 | |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 508 | |
Greg Kroah-Hartman | 712f47c | 2005-11-16 11:27:07 -0800 | [diff] [blame] | 509 | config HOTPLUG |
| 510 | bool "Support for hot-pluggable devices" if EMBEDDED |
| 511 | default y |
| 512 | help |
| 513 | This option is provided for the case where no hotplug or uevent |
| 514 | capabilities is wanted by the kernel. You should only consider |
| 515 | disabling this option for embedded systems that do not use modules, a |
| 516 | dynamic /dev tree, or dynamic device discovery. Just say Y. |
| 517 | |
Matt Mackall | d59745c | 2005-05-01 08:59:02 -0700 | [diff] [blame] | 518 | config PRINTK |
| 519 | default y |
| 520 | bool "Enable support for printk" if EMBEDDED |
| 521 | help |
| 522 | This option enables normal printk support. Removing it |
| 523 | eliminates most of the message strings from the kernel image |
| 524 | and makes the kernel more or less silent. As this makes it |
| 525 | very difficult to diagnose system problems, saying N here is |
| 526 | strongly discouraged. |
| 527 | |
Matt Mackall | c8538a7 | 2005-05-01 08:59:01 -0700 | [diff] [blame] | 528 | config BUG |
| 529 | bool "BUG() support" if EMBEDDED |
| 530 | default y |
| 531 | help |
| 532 | Disabling this option eliminates support for BUG and WARN, reducing |
| 533 | the size of your kernel image and potentially quietly ignoring |
| 534 | numerous fatal conditions. You should only consider disabling this |
| 535 | option for embedded systems with no facilities for reporting errors. |
| 536 | Just say Y. |
| 537 | |
Matt Mackall | 708e9a7 | 2006-01-08 01:05:25 -0800 | [diff] [blame] | 538 | config ELF_CORE |
| 539 | default y |
| 540 | bool "Enable ELF core dumps" if EMBEDDED |
| 541 | help |
| 542 | Enable support for generating core dumps. Disabling saves about 4k. |
| 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | config BASE_FULL |
| 545 | default y |
| 546 | bool "Enable full-sized data structures for core" if EMBEDDED |
| 547 | help |
| 548 | Disabling this option reduces the size of miscellaneous core |
| 549 | kernel data structures. This saves memory on small machines, |
| 550 | but may reduce performance. |
| 551 | |
| 552 | config FUTEX |
| 553 | bool "Enable futex support" if EMBEDDED |
| 554 | default y |
Ingo Molnar | 23f78d4 | 2006-06-27 02:54:53 -0700 | [diff] [blame] | 555 | select RT_MUTEXES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | help |
| 557 | Disabling this option will cause the kernel to be built without |
| 558 | support for "fast userspace mutexes". The resulting kernel may not |
| 559 | run glibc-based applications correctly. |
| 560 | |
Davide Libenzi | 5dc8bf8 | 2007-05-10 22:23:11 -0700 | [diff] [blame] | 561 | config ANON_INODES |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 562 | bool |
Davide Libenzi | 5dc8bf8 | 2007-05-10 22:23:11 -0700 | [diff] [blame] | 563 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | config EPOLL |
| 565 | bool "Enable eventpoll support" if EMBEDDED |
| 566 | default y |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 567 | select ANON_INODES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | help |
| 569 | Disabling this option will cause the kernel to be built without |
| 570 | support for epoll family of system calls. |
| 571 | |
Davide Libenzi | fba2afa | 2007-05-10 22:23:13 -0700 | [diff] [blame] | 572 | config SIGNALFD |
| 573 | bool "Enable signalfd() system call" if EMBEDDED |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 574 | select ANON_INODES |
Davide Libenzi | fba2afa | 2007-05-10 22:23:13 -0700 | [diff] [blame] | 575 | default y |
| 576 | help |
| 577 | Enable the signalfd() system call that allows to receive signals |
| 578 | on a file descriptor. |
| 579 | |
| 580 | If unsure, say Y. |
| 581 | |
Davide Libenzi | b215e28 | 2007-05-10 22:23:16 -0700 | [diff] [blame] | 582 | config TIMERFD |
| 583 | bool "Enable timerfd() system call" if EMBEDDED |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 584 | select ANON_INODES |
Davide Libenzi | b215e28 | 2007-05-10 22:23:16 -0700 | [diff] [blame] | 585 | default y |
| 586 | help |
| 587 | Enable the timerfd() system call that allows to receive timer |
| 588 | events on a file descriptor. |
| 589 | |
| 590 | If unsure, say Y. |
| 591 | |
Davide Libenzi | e1ad746 | 2007-05-10 22:23:19 -0700 | [diff] [blame] | 592 | config EVENTFD |
| 593 | bool "Enable eventfd() system call" if EMBEDDED |
Adrian Bunk | 448e3ce | 2007-07-31 00:39:10 -0700 | [diff] [blame] | 594 | select ANON_INODES |
Davide Libenzi | e1ad746 | 2007-05-10 22:23:19 -0700 | [diff] [blame] | 595 | default y |
| 596 | help |
| 597 | Enable the eventfd() system call that allows to receive both |
| 598 | kernel notification (ie. KAIO) or userspace notifications. |
| 599 | |
| 600 | If unsure, say Y. |
| 601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | config SHMEM |
| 603 | bool "Use full shmem filesystem" if EMBEDDED |
| 604 | default y |
| 605 | depends on MMU |
| 606 | help |
| 607 | The shmem is an internal filesystem used to manage shared memory. |
| 608 | It is backed by swap and manages resource limits. It is also exported |
| 609 | to userspace as tmpfs if TMPFS is enabled. Disabling this |
| 610 | option replaces shmem and tmpfs with the much simpler ramfs code, |
| 611 | which may be appropriate on small systems without swap. |
| 612 | |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 613 | config VM_EVENT_COUNTERS |
| 614 | default y |
| 615 | bool "Enable VM event counters for /proc/vmstat" if EMBEDDED |
| 616 | help |
Paul Jackson | 2aea4fb | 2006-12-22 01:06:10 -0800 | [diff] [blame] | 617 | VM event counters are needed for event counts to be shown. |
| 618 | This option allows the disabling of the VM event counters |
| 619 | on EMBEDDED systems. /proc/vmstat will only show page counts |
| 620 | if VM event counters are disabled. |
Christoph Lameter | f8891e5 | 2006-06-30 01:55:45 -0700 | [diff] [blame] | 621 | |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 622 | config SLUB_DEBUG |
| 623 | default y |
| 624 | bool "Enable SLUB debugging support" if EMBEDDED |
Christoph Lameter | d4751a2 | 2007-05-10 03:15:40 -0700 | [diff] [blame] | 625 | depends on SLUB |
Christoph Lameter | 41ecc55 | 2007-05-09 02:32:44 -0700 | [diff] [blame] | 626 | help |
| 627 | SLUB has extensive debug support features. Disabling these can |
| 628 | result in significant savings in code size. This also disables |
| 629 | SLUB sysfs support. /sys/slab will not exist and there will be |
| 630 | no support for cache validation etc. |
| 631 | |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 632 | choice |
| 633 | prompt "Choose SLAB allocator" |
Christoph Lameter | a0acd82 | 2007-07-17 04:03:32 -0700 | [diff] [blame] | 634 | default SLUB |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 635 | help |
| 636 | This option allows to select a slab allocator. |
| 637 | |
| 638 | config SLAB |
| 639 | bool "SLAB" |
| 640 | help |
| 641 | The regular slab allocator that is established and known to work |
Christoph Lameter | 3401388 | 2007-05-09 02:32:47 -0700 | [diff] [blame] | 642 | well in all environments. It organizes cache hot objects in |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 643 | per cpu and per node queues. SLAB is the default choice for |
Christoph Lameter | 3401388 | 2007-05-09 02:32:47 -0700 | [diff] [blame] | 644 | a slab allocator. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 645 | |
| 646 | config SLUB |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 647 | bool "SLUB (Unqueued Allocator)" |
| 648 | help |
| 649 | SLUB is a slab allocator that minimizes cache line usage |
| 650 | instead of managing queues of cached objects (SLAB approach). |
| 651 | Per cpu caching is realized using slabs of objects instead |
| 652 | of queues of objects. SLUB can use memory efficiently |
Christoph Lameter | 3401388 | 2007-05-09 02:32:47 -0700 | [diff] [blame] | 653 | and has enhanced diagnostics. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 654 | |
| 655 | config SLOB |
Paul Mundt | 84a01c2 | 2007-07-15 23:38:24 -0700 | [diff] [blame] | 656 | depends on EMBEDDED |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 657 | bool "SLOB (Simple Allocator)" |
| 658 | help |
Matt Mackall | 3729145 | 2008-02-04 22:29:38 -0800 | [diff] [blame] | 659 | SLOB replaces the stock allocator with a drastically simpler |
| 660 | allocator. SLOB is generally more space efficient but |
| 661 | does not perform as well on large systems. |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 662 | |
| 663 | endchoice |
| 664 | |
Mathieu Desnoyers | 125e564 | 2008-02-02 15:10:36 -0500 | [diff] [blame] | 665 | config PROFILING |
| 666 | bool "Profiling support (EXPERIMENTAL)" |
| 667 | help |
| 668 | Say Y here to enable the extended profiling support mechanisms used |
| 669 | by profilers such as OProfile. |
| 670 | |
| 671 | config MARKERS |
| 672 | bool "Activate markers" |
| 673 | help |
| 674 | Place an empty function call at each marker site. Can be |
| 675 | dynamically changed for a probe function. |
| 676 | |
Mathieu Desnoyers | fb32e03 | 2008-02-02 15:10:33 -0500 | [diff] [blame] | 677 | source "arch/Kconfig" |
| 678 | |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 679 | config PROC_PAGE_MONITOR |
| 680 | default y |
| 681 | depends on PROC_FS && MMU |
| 682 | bool "Enable /proc page monitoring" if EMBEDDED |
| 683 | help |
| 684 | Various /proc files exist to monitor process memory utilization: |
| 685 | /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap, |
| 686 | /proc/kpagecount, and /proc/kpageflags. Disabling these |
| 687 | interfaces will reduce the size of the kernel by approximately 4kb. |
| 688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | endmenu # General setup |
| 690 | |
Linus Torvalds | 158a962 | 2008-01-02 13:04:48 -0800 | [diff] [blame] | 691 | config SLABINFO |
| 692 | bool |
| 693 | depends on PROC_FS |
| 694 | depends on SLAB || SLUB |
| 695 | default y |
| 696 | |
Chuck Ebbert | ae81f9e | 2006-09-16 12:15:53 -0700 | [diff] [blame] | 697 | config RT_MUTEXES |
| 698 | boolean |
| 699 | select PLIST |
| 700 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | config TINY_SHMEM |
| 702 | default !SHMEM |
| 703 | bool |
| 704 | |
| 705 | config BASE_SMALL |
| 706 | int |
| 707 | default 0 if BASE_FULL |
| 708 | default 1 if !BASE_FULL |
| 709 | |
Jan Engelhardt | 66da573 | 2007-07-15 23:39:29 -0700 | [diff] [blame] | 710 | menuconfig MODULES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | bool "Enable loadable module support" |
| 712 | help |
| 713 | Kernel modules are small pieces of compiled code which can |
| 714 | be inserted in the running kernel, rather than being |
| 715 | permanently built into the kernel. You use the "modprobe" |
| 716 | tool to add (and sometimes remove) them. If you say Y here, |
| 717 | many parts of the kernel can be built as modules (by |
| 718 | answering M instead of Y where indicated): this is most |
| 719 | useful for infrequently used options which are not required |
| 720 | for booting. For more information, see the man pages for |
| 721 | modprobe, lsmod, modinfo, insmod and rmmod. |
| 722 | |
| 723 | If you say Y here, you will need to run "make |
| 724 | modules_install" to put the modules under /lib/modules/ |
| 725 | where modprobe can find them (you may need to be root to do |
| 726 | this). |
| 727 | |
| 728 | If unsure, say Y. |
| 729 | |
| 730 | config MODULE_UNLOAD |
| 731 | bool "Module unloading" |
| 732 | depends on MODULES |
| 733 | help |
| 734 | Without this option you will not be able to unload any |
| 735 | modules (note that some modules may not be unloadable |
| 736 | anyway), which makes your kernel slightly smaller and |
| 737 | simpler. If unsure, say Y. |
| 738 | |
| 739 | config MODULE_FORCE_UNLOAD |
| 740 | bool "Forced module unloading" |
| 741 | depends on MODULE_UNLOAD && EXPERIMENTAL |
| 742 | help |
| 743 | This option allows you to force a module to unload, even if the |
| 744 | kernel believes it is unsafe: the kernel will remove the module |
| 745 | without waiting for anyone to stop using it (using the -f option to |
| 746 | rmmod). This is mainly for kernel developers and desperate users. |
| 747 | If unsure, say N. |
| 748 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | config MODVERSIONS |
Sam Ravnborg | 0d54164 | 2005-12-26 23:04:02 +0100 | [diff] [blame] | 750 | bool "Module versioning support" |
| 751 | depends on MODULES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | help |
| 753 | Usually, you have to use modules compiled with your kernel. |
| 754 | Saying Y here makes it sometimes possible to use modules |
| 755 | compiled for different kernels, by adding enough information |
| 756 | to the modules to (hopefully) spot any changes which would |
| 757 | make them incompatible with the kernel you are running. If |
| 758 | unsure, say N. |
| 759 | |
| 760 | config MODULE_SRCVERSION_ALL |
| 761 | bool "Source checksum for all modules" |
| 762 | depends on MODULES |
| 763 | help |
| 764 | Modules which contain a MODULE_VERSION get an extra "srcversion" |
| 765 | field inserted into their modinfo section, which contains a |
| 766 | sum of the source files which made it. This helps maintainers |
| 767 | see exactly which source was used to build a module (since |
| 768 | others sometimes change the module source without updating |
| 769 | the version). With this option, such a "srcversion" field |
| 770 | will be created for all modules. If unsure, say N. |
| 771 | |
| 772 | config KMOD |
| 773 | bool "Automatic kernel module loading" |
| 774 | depends on MODULES |
| 775 | help |
| 776 | Normally when you have selected some parts of the kernel to |
| 777 | be created as kernel modules, you must load them (using the |
| 778 | "modprobe" command) before you can use them. If you say Y |
| 779 | here, some parts of the kernel will be able to load modules |
| 780 | automatically: when a part of the kernel needs a module, it |
| 781 | runs modprobe with the appropriate arguments, thereby |
| 782 | loading the module if it is available. If unsure, say Y. |
| 783 | |
| 784 | config STOP_MACHINE |
| 785 | bool |
| 786 | default y |
| 787 | depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU |
| 788 | help |
| 789 | Need stop_machine() primitive. |
Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 790 | |
Jens Axboe | 3a65dfe | 2005-11-04 08:43:35 +0100 | [diff] [blame] | 791 | source "block/Kconfig" |
Avi Kivity | e98c320 | 2007-10-16 23:27:31 -0700 | [diff] [blame] | 792 | |
| 793 | config PREEMPT_NOTIFIERS |
| 794 | bool |
Paul E. McKenney | e260be6 | 2008-01-25 21:08:24 +0100 | [diff] [blame] | 795 | |
| 796 | choice |
| 797 | prompt "RCU implementation type:" |
| 798 | default CLASSIC_RCU |
Paul E. McKenney | 0950310 | 2008-01-31 22:45:22 +0100 | [diff] [blame] | 799 | help |
| 800 | This allows you to choose either the classic RCU implementation |
| 801 | that is designed for best read-side performance on non-realtime |
| 802 | systems, or the preemptible RCU implementation for best latency |
| 803 | on realtime systems. Note that some kernel preemption modes |
| 804 | will restrict your choice. |
| 805 | |
| 806 | Select the default if you are unsure. |
Paul E. McKenney | e260be6 | 2008-01-25 21:08:24 +0100 | [diff] [blame] | 807 | |
| 808 | config CLASSIC_RCU |
| 809 | bool "Classic RCU" |
| 810 | help |
| 811 | This option selects the classic RCU implementation that is |
| 812 | designed for best read-side performance on non-realtime |
| 813 | systems. |
| 814 | |
| 815 | Say Y if you are unsure. |
| 816 | |
| 817 | config PREEMPT_RCU |
| 818 | bool "Preemptible RCU" |
| 819 | depends on PREEMPT |
| 820 | help |
| 821 | This option reduces the latency of the kernel by making certain |
| 822 | RCU sections preemptible. Normally RCU code is non-preemptible, if |
| 823 | this option is selected then read-only RCU sections become |
| 824 | preemptible. This helps latency, but may expose bugs due to |
| 825 | now-naive assumptions about each RCU read-side critical section |
| 826 | remaining on a given CPU through its execution. |
| 827 | |
| 828 | Say N if you are unsure. |
| 829 | |
| 830 | endchoice |