Kconfig 23 KB

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  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"
  9. menu "General setup"
  10. config EXPERIMENTAL
  11. bool "Prompt for development and/or incomplete code/drivers"
  12. ---help---
  13. Some of the various things that Linux supports (such as network
  14. drivers, file systems, network protocols, etc.) can be in a state
  15. of development where the functionality, stability, or the level of
  16. testing is not yet high enough for general use. This is usually
  17. known as the "alpha-test" phase among developers. If a feature is
  18. currently in alpha-test, then the developers usually discourage
  19. uninformed widespread use of this feature by the general public to
  20. avoid "Why doesn't this work?" type mail messages. However, active
  21. testing and use of these systems is welcomed. Just be aware that it
  22. may not meet the normal level of reliability or it may fail to work
  23. in some special cases. Detailed bug reports from people familiar
  24. with the kernel internals are usually welcomed by the developers
  25. (before submitting bug reports, please read the documents
  26. <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
  27. <file:Documentation/BUG-HUNTING>, and
  28. <file:Documentation/oops-tracing.txt> in the kernel source).
  29. This option will also make obsoleted drivers available. These are
  30. drivers that have been replaced by something else, and/or are
  31. scheduled to be removed in a future kernel release.
  32. Unless you intend to help test and develop a feature or driver that
  33. falls into this category, or you have a situation that requires
  34. using these features, you should probably say N here, which will
  35. cause the configurator to present you with fewer choices. If
  36. you say Y here, you will be offered the choice of using features or
  37. drivers that are currently considered to be in the alpha-test phase.
  38. config BROKEN
  39. bool
  40. config BROKEN_ON_SMP
  41. bool
  42. depends on BROKEN || !SMP
  43. default y
  44. config LOCK_KERNEL
  45. bool
  46. depends on SMP || PREEMPT
  47. default y
  48. config INIT_ENV_ARG_LIMIT
  49. int
  50. default 32 if !UML
  51. default 128 if UML
  52. help
  53. Maximum of each of the number of arguments and environment
  54. variables passed to init from the kernel command line.
  55. config LOCALVERSION
  56. string "Local version - append to kernel release"
  57. help
  58. Append an extra string to the end of your kernel version.
  59. This will show up when you type uname, for example.
  60. The string you set here will be appended after the contents of
  61. any files with a filename matching localversion* in your
  62. object and source tree, in that order. Your total string can
  63. be a maximum of 64 characters.
  64. config LOCALVERSION_AUTO
  65. bool "Automatically append version information to the version string"
  66. default y
  67. help
  68. This will try to automatically determine if the current tree is a
  69. release tree by looking for git tags that belong to the current
  70. top of tree revision.
  71. A string of the format -gxxxxxxxx will be added to the localversion
  72. if a git-based tree is found. The string generated by this will be
  73. appended after any matching localversion* files, and after the value
  74. set in CONFIG_LOCALVERSION.
  75. (The actual string used here is the first eight characters produced
  76. by running the command:
  77. $ git rev-parse --verify HEAD
  78. which is done within the script "scripts/setlocalversion".)
  79. config SWAP
  80. bool "Support for paging of anonymous memory (swap)"
  81. depends on MMU && BLOCK
  82. default y
  83. help
  84. This option allows you to choose whether you want to have support
  85. for so called swap devices or swap files in your kernel that are
  86. used to provide more virtual memory than the actual RAM present
  87. in your computer. If unsure say Y.
  88. config SYSVIPC
  89. bool "System V IPC"
  90. ---help---
  91. Inter Process Communication is a suite of library functions and
  92. system calls which let processes (running programs) synchronize and
  93. exchange information. It is generally considered to be a good thing,
  94. and some programs won't run unless you say Y here. In particular, if
  95. you want to run the DOS emulator dosemu under Linux (read the
  96. DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
  97. you'll need to say Y here.
  98. You can find documentation about IPC with "info ipc" and also in
  99. section 6.4 of the Linux Programmer's Guide, available from
  100. <http://www.tldp.org/guides.html>.
  101. config SYSVIPC_SYSCTL
  102. bool
  103. depends on SYSVIPC
  104. depends on SYSCTL
  105. default y
  106. config POSIX_MQUEUE
  107. bool "POSIX Message Queues"
  108. depends on NET && EXPERIMENTAL
  109. ---help---
  110. POSIX variant of message queues is a part of IPC. In POSIX message
  111. queues every message has a priority which decides about succession
  112. of receiving it by a process. If you want to compile and run
  113. programs written e.g. for Solaris with use of its POSIX message
  114. queues (functions mq_*) say Y here.
  115. POSIX message queues are visible as a filesystem called 'mqueue'
  116. and can be mounted somewhere if you want to do filesystem
  117. operations on message queues.
  118. If unsure, say Y.
  119. config BSD_PROCESS_ACCT
  120. bool "BSD Process Accounting"
  121. help
  122. If you say Y here, a user level program will be able to instruct the
  123. kernel (via a special system call) to write process accounting
  124. information to a file: whenever a process exits, information about
  125. that process will be appended to the file by the kernel. The
  126. information includes things such as creation time, owning user,
  127. command name, memory usage, controlling terminal etc. (the complete
  128. list is in the struct acct in <file:include/linux/acct.h>). It is
  129. up to the user level program to do useful things with this
  130. information. This is generally a good idea, so say Y.
  131. config BSD_PROCESS_ACCT_V3
  132. bool "BSD Process Accounting version 3 file format"
  133. depends on BSD_PROCESS_ACCT
  134. default n
  135. help
  136. If you say Y here, the process accounting information is written
  137. in a new file format that also logs the process IDs of each
  138. process and it's parent. Note that this file format is incompatible
  139. with previous v0/v1/v2 file formats, so you will need updated tools
  140. for processing it. A preliminary version of these tools is available
  141. at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
  142. config TASKSTATS
  143. bool "Export task/process statistics through netlink (EXPERIMENTAL)"
  144. depends on NET
  145. default n
  146. help
  147. Export selected statistics for tasks/processes through the
  148. generic netlink interface. Unlike BSD process accounting, the
  149. statistics are available during the lifetime of tasks/processes as
  150. responses to commands. Like BSD accounting, they are sent to user
  151. space on task exit.
  152. Say N if unsure.
  153. config TASK_DELAY_ACCT
  154. bool "Enable per-task delay accounting (EXPERIMENTAL)"
  155. depends on TASKSTATS
  156. help
  157. Collect information on time spent by a task waiting for system
  158. resources like cpu, synchronous block I/O completion and swapping
  159. in pages. Such statistics can help in setting a task's priorities
  160. relative to other tasks for cpu, io, rss limits etc.
  161. Say N if unsure.
  162. config TASK_XACCT
  163. bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
  164. depends on TASKSTATS
  165. help
  166. Collect extended task accounting data and send the data
  167. to userland for processing over the taskstats interface.
  168. Say N if unsure.
  169. config TASK_IO_ACCOUNTING
  170. bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
  171. depends on TASK_XACCT
  172. help
  173. Collect information on the number of bytes of storage I/O which this
  174. task has caused.
  175. Say N if unsure.
  176. config USER_NS
  177. bool "User Namespaces (EXPERIMENTAL)"
  178. default n
  179. depends on EXPERIMENTAL
  180. help
  181. Support user namespaces. This allows containers, i.e.
  182. vservers, to use user namespaces to provide different
  183. user info for different servers. If unsure, say N.
  184. config AUDIT
  185. bool "Auditing support"
  186. depends on NET
  187. help
  188. Enable auditing infrastructure that can be used with another
  189. kernel subsystem, such as SELinux (which requires this for
  190. logging of avc messages output). Does not do system-call
  191. auditing without CONFIG_AUDITSYSCALL.
  192. config AUDITSYSCALL
  193. bool "Enable system-call auditing support"
  194. depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64)
  195. default y if SECURITY_SELINUX
  196. help
  197. Enable low-overhead system-call auditing infrastructure that
  198. can be used independently or with another kernel subsystem,
  199. such as SELinux. To use audit's filesystem watch feature, please
  200. ensure that INOTIFY is configured.
  201. config IKCONFIG
  202. tristate "Kernel .config support"
  203. ---help---
  204. This option enables the complete Linux kernel ".config" file
  205. contents to be saved in the kernel. It provides documentation
  206. of which kernel options are used in a running kernel or in an
  207. on-disk kernel. This information can be extracted from the kernel
  208. image file with the script scripts/extract-ikconfig and used as
  209. input to rebuild the current kernel or to build another kernel.
  210. It can also be extracted from a running kernel by reading
  211. /proc/config.gz if enabled (below).
  212. config IKCONFIG_PROC
  213. bool "Enable access to .config through /proc/config.gz"
  214. depends on IKCONFIG && PROC_FS
  215. ---help---
  216. This option enables access to the kernel configuration file
  217. through /proc/config.gz.
  218. config LOG_BUF_SHIFT
  219. int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
  220. range 12 21
  221. default 17 if S390 || LOCKDEP
  222. default 16 if X86_NUMAQ || IA64
  223. default 15 if SMP
  224. default 14
  225. help
  226. Select kernel log buffer size as a power of 2.
  227. Defaults and Examples:
  228. 17 => 128 KB for S/390
  229. 16 => 64 KB for x86 NUMAQ or IA-64
  230. 15 => 32 KB for SMP
  231. 14 => 16 KB for uniprocessor
  232. 13 => 8 KB
  233. 12 => 4 KB
  234. config CGROUPS
  235. bool "Control Group support"
  236. help
  237. This option will let you use process cgroup subsystems
  238. such as Cpusets
  239. Say N if unsure.
  240. config CPUSETS
  241. bool "Cpuset support"
  242. depends on SMP && CGROUPS
  243. help
  244. This option will let you create and manage CPUSETs which
  245. allow dynamically partitioning a system into sets of CPUs and
  246. Memory Nodes and assigning tasks to run only within those sets.
  247. This is primarily useful on large SMP or NUMA systems.
  248. Say N if unsure.
  249. config FAIR_GROUP_SCHED
  250. bool "Fair group CPU scheduler"
  251. default y
  252. depends on EXPERIMENTAL
  253. help
  254. This feature lets CPU scheduler recognize task groups and control CPU
  255. bandwidth allocation to such task groups.
  256. choice
  257. depends on FAIR_GROUP_SCHED
  258. prompt "Basis for grouping tasks"
  259. default FAIR_USER_SCHED
  260. config FAIR_USER_SCHED
  261. bool "user id"
  262. help
  263. This option will choose userid as the basis for grouping
  264. tasks, thus providing equal CPU bandwidth to each user.
  265. endchoice
  266. config SYSFS_DEPRECATED
  267. bool "Create deprecated sysfs files"
  268. default y
  269. help
  270. This option creates deprecated symlinks such as the
  271. "device"-link, the <subsystem>:<name>-link, and the
  272. "bus"-link. It may also add deprecated key in the
  273. uevent environment.
  274. None of these features or values should be used today, as
  275. they export driver core implementation details to userspace
  276. or export properties which can't be kept stable across kernel
  277. releases.
  278. If enabled, this option will also move any device structures
  279. that belong to a class, back into the /sys/class hierarchy, in
  280. order to support older versions of udev.
  281. If you are using a distro that was released in 2006 or later,
  282. it should be safe to say N here.
  283. config PROC_PID_CPUSET
  284. bool "Include legacy /proc/<pid>/cpuset file"
  285. depends on CPUSETS
  286. default y
  287. config RELAY
  288. bool "Kernel->user space relay support (formerly relayfs)"
  289. help
  290. This option enables support for relay interface support in
  291. certain file systems (such as debugfs).
  292. It is designed to provide an efficient mechanism for tools and
  293. facilities to relay large amounts of data from kernel space to
  294. user space.
  295. If unsure, say N.
  296. config BLK_DEV_INITRD
  297. bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
  298. depends on BROKEN || !FRV
  299. help
  300. The initial RAM filesystem is a ramfs which is loaded by the
  301. boot loader (loadlin or lilo) and that is mounted as root
  302. before the normal boot procedure. It is typically used to
  303. load modules needed to mount the "real" root file system,
  304. etc. See <file:Documentation/initrd.txt> for details.
  305. If RAM disk support (BLK_DEV_RAM) is also included, this
  306. also enables initial RAM disk (initrd) support and adds
  307. 15 Kbytes (more on some other architectures) to the kernel size.
  308. If unsure say Y.
  309. if BLK_DEV_INITRD
  310. source "usr/Kconfig"
  311. endif
  312. config CC_OPTIMIZE_FOR_SIZE
  313. bool "Optimize for size (Look out for broken compilers!)"
  314. default y
  315. depends on ARM || H8300 || SUPERH || EXPERIMENTAL
  316. help
  317. Enabling this option will pass "-Os" instead of "-O2" to gcc
  318. resulting in a smaller kernel.
  319. WARNING: some versions of gcc may generate incorrect code with this
  320. option. If problems are observed, a gcc upgrade may be needed.
  321. If unsure, say N.
  322. config SYSCTL
  323. bool
  324. menuconfig EMBEDDED
  325. bool "Configure standard kernel features (for small systems)"
  326. help
  327. This option allows certain base kernel options and settings
  328. to be disabled or tweaked. This is for specialized
  329. environments which can tolerate a "non-standard" kernel.
  330. Only use this if you really know what you are doing.
  331. config UID16
  332. bool "Enable 16-bit UID system calls" if EMBEDDED
  333. depends on ARM || BFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION)
  334. default y
  335. help
  336. This enables the legacy 16-bit UID syscall wrappers.
  337. config SYSCTL_SYSCALL
  338. bool "Sysctl syscall support" if EMBEDDED
  339. default y
  340. select SYSCTL
  341. ---help---
  342. sys_sysctl uses binary paths that have been found challenging
  343. to properly maintain and use. The interface in /proc/sys
  344. using paths with ascii names is now the primary path to this
  345. information.
  346. Almost nothing using the binary sysctl interface so if you are
  347. trying to save some space it is probably safe to disable this,
  348. making your kernel marginally smaller.
  349. If unsure say Y here.
  350. config KALLSYMS
  351. bool "Load all symbols for debugging/ksymoops" if EMBEDDED
  352. default y
  353. help
  354. Say Y here to let the kernel print out symbolic crash information and
  355. symbolic stack backtraces. This increases the size of the kernel
  356. somewhat, as all symbols have to be loaded into the kernel image.
  357. config KALLSYMS_ALL
  358. bool "Include all symbols in kallsyms"
  359. depends on DEBUG_KERNEL && KALLSYMS
  360. help
  361. Normally kallsyms only contains the symbols of functions, for nicer
  362. OOPS messages. Some debuggers can use kallsyms for other
  363. symbols too: say Y here to include all symbols, if you need them
  364. and you don't care about adding 300k to the size of your kernel.
  365. Say N.
  366. config KALLSYMS_EXTRA_PASS
  367. bool "Do an extra kallsyms pass"
  368. depends on KALLSYMS
  369. help
  370. If kallsyms is not working correctly, the build will fail with
  371. inconsistent kallsyms data. If that occurs, log a bug report and
  372. turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
  373. Always say N here unless you find a bug in kallsyms, which must be
  374. reported. KALLSYMS_EXTRA_PASS is only a temporary workaround while
  375. you wait for kallsyms to be fixed.
  376. config HOTPLUG
  377. bool "Support for hot-pluggable devices" if EMBEDDED
  378. default y
  379. help
  380. This option is provided for the case where no hotplug or uevent
  381. capabilities is wanted by the kernel. You should only consider
  382. disabling this option for embedded systems that do not use modules, a
  383. dynamic /dev tree, or dynamic device discovery. Just say Y.
  384. config PRINTK
  385. default y
  386. bool "Enable support for printk" if EMBEDDED
  387. help
  388. This option enables normal printk support. Removing it
  389. eliminates most of the message strings from the kernel image
  390. and makes the kernel more or less silent. As this makes it
  391. very difficult to diagnose system problems, saying N here is
  392. strongly discouraged.
  393. config BUG
  394. bool "BUG() support" if EMBEDDED
  395. default y
  396. help
  397. Disabling this option eliminates support for BUG and WARN, reducing
  398. the size of your kernel image and potentially quietly ignoring
  399. numerous fatal conditions. You should only consider disabling this
  400. option for embedded systems with no facilities for reporting errors.
  401. Just say Y.
  402. config ELF_CORE
  403. default y
  404. bool "Enable ELF core dumps" if EMBEDDED
  405. help
  406. Enable support for generating core dumps. Disabling saves about 4k.
  407. config BASE_FULL
  408. default y
  409. bool "Enable full-sized data structures for core" if EMBEDDED
  410. help
  411. Disabling this option reduces the size of miscellaneous core
  412. kernel data structures. This saves memory on small machines,
  413. but may reduce performance.
  414. config FUTEX
  415. bool "Enable futex support" if EMBEDDED
  416. default y
  417. select RT_MUTEXES
  418. help
  419. Disabling this option will cause the kernel to be built without
  420. support for "fast userspace mutexes". The resulting kernel may not
  421. run glibc-based applications correctly.
  422. config ANON_INODES
  423. bool
  424. config EPOLL
  425. bool "Enable eventpoll support" if EMBEDDED
  426. default y
  427. select ANON_INODES
  428. help
  429. Disabling this option will cause the kernel to be built without
  430. support for epoll family of system calls.
  431. config SIGNALFD
  432. bool "Enable signalfd() system call" if EMBEDDED
  433. select ANON_INODES
  434. default y
  435. help
  436. Enable the signalfd() system call that allows to receive signals
  437. on a file descriptor.
  438. If unsure, say Y.
  439. config TIMERFD
  440. bool "Enable timerfd() system call" if EMBEDDED
  441. select ANON_INODES
  442. depends on BROKEN
  443. default y
  444. help
  445. Enable the timerfd() system call that allows to receive timer
  446. events on a file descriptor.
  447. If unsure, say Y.
  448. config EVENTFD
  449. bool "Enable eventfd() system call" if EMBEDDED
  450. select ANON_INODES
  451. default y
  452. help
  453. Enable the eventfd() system call that allows to receive both
  454. kernel notification (ie. KAIO) or userspace notifications.
  455. If unsure, say Y.
  456. config SHMEM
  457. bool "Use full shmem filesystem" if EMBEDDED
  458. default y
  459. depends on MMU
  460. help
  461. The shmem is an internal filesystem used to manage shared memory.
  462. It is backed by swap and manages resource limits. It is also exported
  463. to userspace as tmpfs if TMPFS is enabled. Disabling this
  464. option replaces shmem and tmpfs with the much simpler ramfs code,
  465. which may be appropriate on small systems without swap.
  466. config VM_EVENT_COUNTERS
  467. default y
  468. bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
  469. help
  470. VM event counters are needed for event counts to be shown.
  471. This option allows the disabling of the VM event counters
  472. on EMBEDDED systems. /proc/vmstat will only show page counts
  473. if VM event counters are disabled.
  474. config SLUB_DEBUG
  475. default y
  476. bool "Enable SLUB debugging support" if EMBEDDED
  477. depends on SLUB
  478. help
  479. SLUB has extensive debug support features. Disabling these can
  480. result in significant savings in code size. This also disables
  481. SLUB sysfs support. /sys/slab will not exist and there will be
  482. no support for cache validation etc.
  483. choice
  484. prompt "Choose SLAB allocator"
  485. default SLUB
  486. help
  487. This option allows to select a slab allocator.
  488. config SLAB
  489. bool "SLAB"
  490. help
  491. The regular slab allocator that is established and known to work
  492. well in all environments. It organizes cache hot objects in
  493. per cpu and per node queues. SLAB is the default choice for
  494. a slab allocator.
  495. config SLUB
  496. bool "SLUB (Unqueued Allocator)"
  497. help
  498. SLUB is a slab allocator that minimizes cache line usage
  499. instead of managing queues of cached objects (SLAB approach).
  500. Per cpu caching is realized using slabs of objects instead
  501. of queues of objects. SLUB can use memory efficiently
  502. and has enhanced diagnostics.
  503. config SLOB
  504. depends on EMBEDDED
  505. bool "SLOB (Simple Allocator)"
  506. help
  507. SLOB replaces the SLAB allocator with a drastically simpler
  508. allocator. SLOB is more space efficient than SLAB but does not
  509. scale well (single lock for all operations) and is also highly
  510. susceptible to fragmentation. SLUB can accomplish a higher object
  511. density. It is usually better to use SLUB instead of SLOB.
  512. endchoice
  513. endmenu # General setup
  514. config RT_MUTEXES
  515. boolean
  516. select PLIST
  517. config TINY_SHMEM
  518. default !SHMEM
  519. bool
  520. config BASE_SMALL
  521. int
  522. default 0 if BASE_FULL
  523. default 1 if !BASE_FULL
  524. menuconfig MODULES
  525. bool "Enable loadable module support"
  526. help
  527. Kernel modules are small pieces of compiled code which can
  528. be inserted in the running kernel, rather than being
  529. permanently built into the kernel. You use the "modprobe"
  530. tool to add (and sometimes remove) them. If you say Y here,
  531. many parts of the kernel can be built as modules (by
  532. answering M instead of Y where indicated): this is most
  533. useful for infrequently used options which are not required
  534. for booting. For more information, see the man pages for
  535. modprobe, lsmod, modinfo, insmod and rmmod.
  536. If you say Y here, you will need to run "make
  537. modules_install" to put the modules under /lib/modules/
  538. where modprobe can find them (you may need to be root to do
  539. this).
  540. If unsure, say Y.
  541. config MODULE_UNLOAD
  542. bool "Module unloading"
  543. depends on MODULES
  544. help
  545. Without this option you will not be able to unload any
  546. modules (note that some modules may not be unloadable
  547. anyway), which makes your kernel slightly smaller and
  548. simpler. If unsure, say Y.
  549. config MODULE_FORCE_UNLOAD
  550. bool "Forced module unloading"
  551. depends on MODULE_UNLOAD && EXPERIMENTAL
  552. help
  553. This option allows you to force a module to unload, even if the
  554. kernel believes it is unsafe: the kernel will remove the module
  555. without waiting for anyone to stop using it (using the -f option to
  556. rmmod). This is mainly for kernel developers and desperate users.
  557. If unsure, say N.
  558. config MODVERSIONS
  559. bool "Module versioning support"
  560. depends on MODULES
  561. help
  562. Usually, you have to use modules compiled with your kernel.
  563. Saying Y here makes it sometimes possible to use modules
  564. compiled for different kernels, by adding enough information
  565. to the modules to (hopefully) spot any changes which would
  566. make them incompatible with the kernel you are running. If
  567. unsure, say N.
  568. config MODULE_SRCVERSION_ALL
  569. bool "Source checksum for all modules"
  570. depends on MODULES
  571. help
  572. Modules which contain a MODULE_VERSION get an extra "srcversion"
  573. field inserted into their modinfo section, which contains a
  574. sum of the source files which made it. This helps maintainers
  575. see exactly which source was used to build a module (since
  576. others sometimes change the module source without updating
  577. the version). With this option, such a "srcversion" field
  578. will be created for all modules. If unsure, say N.
  579. config KMOD
  580. bool "Automatic kernel module loading"
  581. depends on MODULES
  582. help
  583. Normally when you have selected some parts of the kernel to
  584. be created as kernel modules, you must load them (using the
  585. "modprobe" command) before you can use them. If you say Y
  586. here, some parts of the kernel will be able to load modules
  587. automatically: when a part of the kernel needs a module, it
  588. runs modprobe with the appropriate arguments, thereby
  589. loading the module if it is available. If unsure, say Y.
  590. config STOP_MACHINE
  591. bool
  592. default y
  593. depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
  594. help
  595. Need stop_machine() primitive.
  596. source "block/Kconfig"
  597. config PREEMPT_NOTIFIERS
  598. bool