init/Kconfig

   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
  10 menu "General setup"
  11
  12 config EXPERIMENTAL
  13         bool "Prompt for development and/or incomplete code/drivers"
  14         ---help---
  15           Some of the various things that Linux supports (such as network
  16           drivers, file systems, network protocols, etc.) can be in a state
  17           of development where the functionality, stability, or the level of
  18           testing is not yet high enough for general use. This is usually
  19           known as the "alpha-test" phase among developers. If a feature is
  20           currently in alpha-test, then the developers usually discourage
  21           uninformed widespread use of this feature by the general public to
  22           avoid "Why doesn't this work?" type mail messages. However, active
  23           testing and use of these systems is welcomed. Just be aware that it
  24           may not meet the normal level of reliability or it may fail to work
  25           in some special cases. Detailed bug reports from people familiar
  26           with the kernel internals are usually welcomed by the developers
  27           (before submitting bug reports, please read the documents
  28           <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
  29           <file:Documentation/BUG-HUNTING>, and
  30           <file:Documentation/oops-tracing.txt> in the kernel source).
  31
  32           This option will also make obsoleted drivers available. These are
  33           drivers that have been replaced by something else, and/or are
  34           scheduled to be removed in a future kernel release.
  35
  36           Unless you intend to help test and develop a feature or driver that
  37           falls into this category, or you have a situation that requires
  38           using these features, you should probably say N here, which will
  39           cause the configurator to present you with fewer choices. If
  40           you say Y here, you will be offered the choice of using features or
  41           drivers that are currently considered to be in the alpha-test phase.
  42
  43 config BROKEN
  44         bool
  45
  46 config BROKEN_ON_SMP
  47         bool
  48         depends on BROKEN || !SMP
  49         default y
  50
  51 config LOCK_KERNEL
  52         bool
  53         depends on SMP || PREEMPT
  54         default y
  55
  56 config INIT_ENV_ARG_LIMIT
  57         int
  58         default 32 if !UML
  59         default 128 if UML
  60         help
  61           Maximum of each of the number of arguments and environment
  62           variables passed to init from the kernel command line.
  63
  64
  65 config LOCALVERSION
  66         string "Local version - append to kernel release"
  67         help
  68           Append an extra string to the end of your kernel version.
  69           This will show up when you type uname, for example.
  70           The string you set here will be appended after the contents of
  71           any files with a filename matching localversion* in your
  72           object and source tree, in that order.  Your total string can
  73           be a maximum of 64 characters.
  74
  75 config LOCALVERSION_AUTO
  76         bool "Automatically append version information to the version string"
  77         default y
  78         help
  79           This will try to automatically determine if the current tree is a
  80           release tree by looking for git tags that belong to the current
  81           top of tree revision.
  82
  83           A string of the format -gxxxxxxxx will be added to the localversion
  84           if a git-based tree is found.  The string generated by this will be
  85           appended after any matching localversion* files, and after the value
  86           set in CONFIG_LOCALVERSION.
  87
  88           (The actual string used here is the first eight characters produced
  89           by running the command:
  90
  91             $ git rev-parse --verify HEAD
  92
  93           which is done within the script "scripts/setlocalversion".)
  94
  95 config SWAP
  96         bool "Support for paging of anonymous memory (swap)"
  97         depends on MMU && BLOCK
  98         default y
  99         help
 100           This option allows you to choose whether you want to have support
 101           for so called swap devices or swap files in your kernel that are
 102           used to provide more virtual memory than the actual RAM present
 103           in your computer.  If unsure say Y.
 104
 105 config SYSVIPC
 106         bool "System V IPC"
 107         ---help---
 108           Inter Process Communication is a suite of library functions and
 109           system calls which let processes (running programs) synchronize and
 110           exchange information. It is generally considered to be a good thing,
 111           and some programs won't run unless you say Y here. In particular, if
 112           you want to run the DOS emulator dosemu under Linux (read the
 113           DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
 114           you'll need to say Y here.
 115
 116           You can find documentation about IPC with "info ipc" and also in
 117           section 6.4 of the Linux Programmer's Guide, available from
 118           <http://www.tldp.org/guides.html>.
 119
 120 config SYSVIPC_SYSCTL
 121         bool
 122         depends on SYSVIPC
 123         depends on SYSCTL
 124         default y
 125
 126 config POSIX_MQUEUE
 127         bool "POSIX Message Queues"
 128         depends on NET && EXPERIMENTAL
 129         ---help---
 130           POSIX variant of message queues is a part of IPC. In POSIX message
 131           queues every message has a priority which decides about succession
 132           of receiving it by a process. If you want to compile and run
 133           programs written e.g. for Solaris with use of its POSIX message
 134           queues (functions mq_*) say Y here.
 135
 136           POSIX message queues are visible as a filesystem called 'mqueue'
 137           and can be mounted somewhere if you want to do filesystem
 138           operations on message queues.
 139
 140           If unsure, say Y.
 141
 142 config BSD_PROCESS_ACCT
 143         bool "BSD Process Accounting"
 144         help
 145           If you say Y here, a user level program will be able to instruct the
 146           kernel (via a special system call) to write process accounting
 147           information to a file: whenever a process exits, information about
 148           that process will be appended to the file by the kernel.  The
 149           information includes things such as creation time, owning user,
 150           command name, memory usage, controlling terminal etc. (the complete
 151           list is in the struct acct in <file:include/linux/acct.h>).  It is
 152           up to the user level program to do useful things with this
 153           information.  This is generally a good idea, so say Y.
 154
 155 config BSD_PROCESS_ACCT_V3
 156         bool "BSD Process Accounting version 3 file format"
 157         depends on BSD_PROCESS_ACCT
 158         default n
 159         help
 160           If you say Y here, the process accounting information is written
 161           in a new file format that also logs the process IDs of each
 162           process and it's parent. Note that this file format is incompatible
 163           with previous v0/v1/v2 file formats, so you will need updated tools
 164           for processing it. A preliminary version of these tools is available
 165           at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.
 166
 167 config TASKSTATS
 168         bool "Export task/process statistics through netlink (EXPERIMENTAL)"
 169         depends on NET
 170         default n
 171         help
 172           Export selected statistics for tasks/processes through the
 173           generic netlink interface. Unlike BSD process accounting, the
 174           statistics are available during the lifetime of tasks/processes as
 175           responses to commands. Like BSD accounting, they are sent to user
 176           space on task exit.
 177
 178           Say N if unsure.
 179
 180 config TASK_DELAY_ACCT
 181         bool "Enable per-task delay accounting (EXPERIMENTAL)"
 182         depends on TASKSTATS
 183         help
 184           Collect information on time spent by a task waiting for system
 185           resources like cpu, synchronous block I/O completion and swapping
 186           in pages. Such statistics can help in setting a task's priorities
 187           relative to other tasks for cpu, io, rss limits etc.
 188
 189           Say N if unsure.
 190
 191 config TASK_XACCT
 192         bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
 193         depends on TASKSTATS
 194         help
 195           Collect extended task accounting data and send the data
 196           to userland for processing over the taskstats interface.
 197
 198           Say N if unsure.
 199
 200 config TASK_IO_ACCOUNTING
 201         bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
 202         depends on TASK_XACCT
 203         help
 204           Collect information on the number of bytes of storage I/O which this
 205           task has caused.
 206
 207           Say N if unsure.
 208
 209 config USER_NS
 210         bool "User Namespaces (EXPERIMENTAL)"
 211         default n
 212         depends on EXPERIMENTAL
 213         help
 214           Support user namespaces.  This allows containers, i.e.
 215           vservers, to use user namespaces to provide different
 216           user info for different servers.  If unsure, say N.
 217
 218 config AUDIT
 219         bool "Auditing support"
 220         depends on NET
 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"
 229         depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64)
 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,
 234           such as SELinux.  To use audit's filesystem watch feature, please
 235           ensure that INOTIFY is configured.
 236
 237 config IKCONFIG
 238         tristate "Kernel .config support"
 239         ---help---
 240           This option enables the complete Linux kernel ".config" file
 241           contents to be saved in the kernel. It provides documentation
 242           of which kernel options are used in a running kernel or in an
 243           on-disk kernel.  This information can be extracted from the kernel
 244           image file with the script scripts/extract-ikconfig and used as
 245           input to rebuild the current kernel or to build another kernel.
 246           It can also be extracted from a running kernel by reading
 247           /proc/config.gz if enabled (below).
 248
 249 config IKCONFIG_PROC
 250         bool "Enable access to .config through /proc/config.gz"
 251         depends on IKCONFIG && PROC_FS
 252         ---help---
 253           This option enables access to the kernel configuration file
 254           through /proc/config.gz.
 255
 256 config LOG_BUF_SHIFT
 257         int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
 258         range 12 21
 259         default 17 if S390 || LOCKDEP
 260         default 16 if X86_NUMAQ || IA64
 261         default 15 if SMP
 262         default 14
 263         help
 264           Select kernel log buffer size as a power of 2.
 265           Defaults and Examples:
 266                      17 => 128 KB for S/390
 267                      16 => 64 KB for x86 NUMAQ or IA-64
 268                      15 => 32 KB for SMP
 269                      14 => 16 KB for uniprocessor
 270                      13 =>  8 KB
 271                      12 =>  4 KB
 272
 273 config CGROUPS
 274         bool "Control Group support"
 275         help
 276           This option will let you use process cgroup subsystems
 277           such as Cpusets
 278
 279           Say N if unsure.
 280
 281 config CPUSETS
 282         bool "Cpuset support"
 283         depends on SMP && CGROUPS
 284         help
 285           This option will let you create and manage CPUSETs which
 286           allow dynamically partitioning a system into sets of CPUs and
 287           Memory Nodes and assigning tasks to run only within those sets.
 288           This is primarily useful on large SMP or NUMA systems.
 289
 290           Say N if unsure.
 291
 292 config FAIR_GROUP_SCHED
 293         bool "Fair group CPU scheduler"
 294         default y
 295         depends on EXPERIMENTAL
 296         help
 297           This feature lets CPU scheduler recognize task groups and control CPU
 298           bandwidth allocation to such task groups.
 299
 300 choice
 301         depends on FAIR_GROUP_SCHED
 302         prompt "Basis for grouping tasks"
 303         default FAIR_USER_SCHED
 304
 305 config FAIR_USER_SCHED
 306         bool "user id"
 307         help
 308           This option will choose userid as the basis for grouping
 309           tasks, thus providing equal CPU bandwidth to each user.
 310
 311 endchoice
 312
 313 config SYSFS_DEPRECATED
 314         bool "Create deprecated sysfs files"
 315         default y
 316         help
 317           This option creates deprecated symlinks such as the
 318           "device"-link, the <subsystem>:<name>-link, and the
 319           "bus"-link. It may also add deprecated key in the
 320           uevent environment.
 321           None of these features or values should be used today, as
 322           they export driver core implementation details to userspace
 323           or export properties which can't be kept stable across kernel
 324           releases.
 325
 326           If enabled, this option will also move any device structures
 327           that belong to a class, back into the /sys/class hierarchy, in
 328           order to support older versions of udev.
 329
 330           If you are using a distro that was released in 2006 or later,
 331           it should be safe to say N here.
 332
 333 config PROC_PID_CPUSET
 334         bool "Include legacy /proc/<pid>/cpuset file"
 335         depends on CPUSETS
 336         default y
 337
 338 config CGROUP_CPUACCT
 339         bool "Simple CPU accounting cgroup subsystem"
 340         depends on CGROUPS
 341         help
 342           Provides a simple Resource Controller for monitoring the
 343           total CPU consumed by the tasks in a cgroup
 344
 345 config RELAY
 346         bool "Kernel->user space relay support (formerly relayfs)"
 347         help
 348           This option enables support for relay interface support in
 349           certain file systems (such as debugfs).
 350           It is designed to provide an efficient mechanism for tools and
 351           facilities to relay large amounts of data from kernel space to
 352           user space.
 353
 354           If unsure, say N.
 355
 356 config BLK_DEV_INITRD
 357         bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
 358         depends on BROKEN || !FRV
 359         help
 360           The initial RAM filesystem is a ramfs which is loaded by the
 361           boot loader (loadlin or lilo) and that is mounted as root
 362           before the normal boot procedure. It is typically used to
 363           load modules needed to mount the "real" root file system,
 364           etc. See <file:Documentation/initrd.txt> for details.
 365
 366           If RAM disk support (BLK_DEV_RAM) is also included, this
 367           also enables initial RAM disk (initrd) support and adds
 368           15 Kbytes (more on some other architectures) to the kernel size.
 369
 370           If unsure say Y.
 371
 372 if BLK_DEV_INITRD
 373
 374 source "usr/Kconfig"
 375
 376 endif
 377
 378 config CC_OPTIMIZE_FOR_SIZE
 379         bool "Optimize for size (Look out for broken compilers!)"
 380         default y
 381         depends on ARM || H8300 || SUPERH || EXPERIMENTAL
 382         help
 383           Enabling this option will pass "-Os" instead of "-O2" to gcc
 384           resulting in a smaller kernel.
 385
 386           WARNING: some versions of gcc may generate incorrect code with this
 387           option.  If problems are observed, a gcc upgrade may be needed.
 388
 389           If unsure, say N.
 390
 391 config SYSCTL
 392         bool
 393
 394 menuconfig EMBEDDED
 395         bool "Configure standard kernel features (for small systems)"
 396         help
 397           This option allows certain base kernel options and settings
 398           to be disabled or tweaked. This is for specialized
 399           environments which can tolerate a "non-standard" kernel.
 400           Only use this if you really know what you are doing.
 401
 402 config UID16
 403         bool "Enable 16-bit UID system calls" if EMBEDDED
 404         depends on ARM || BFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION)
 405         default y
 406         help
 407           This enables the legacy 16-bit UID syscall wrappers.
 408
 409 config SYSCTL_SYSCALL
 410         bool "Sysctl syscall support" if EMBEDDED
 411         default y
 412         select SYSCTL
 413         ---help---
 414           sys_sysctl uses binary paths that have been found challenging
 415           to properly maintain and use.  The interface in /proc/sys
 416           using paths with ascii names is now the primary path to this
 417           information.
 418
 419           Almost nothing using the binary sysctl interface so if you are
 420           trying to save some space it is probably safe to disable this,
 421           making your kernel marginally smaller.
 422
 423           If unsure say Y here.
 424
 425 config KALLSYMS
 426          bool "Load all symbols for debugging/ksymoops" if EMBEDDED
 427          default y
 428          help
 429            Say Y here to let the kernel print out symbolic crash information and
 430            symbolic stack backtraces. This increases the size of the kernel
 431            somewhat, as all symbols have to be loaded into the kernel image.
 432
 433 config KALLSYMS_ALL
 434         bool "Include all symbols in kallsyms"
 435         depends on DEBUG_KERNEL && KALLSYMS
 436         help
 437            Normally kallsyms only contains the symbols of functions, for nicer
 438            OOPS messages.  Some debuggers can use kallsyms for other
 439            symbols too: say Y here to include all symbols, if you need them
 440            and you don't care about adding 300k to the size of your kernel.
 441
 442            Say N.
 443
 444 config KALLSYMS_EXTRA_PASS
 445         bool "Do an extra kallsyms pass"
 446         depends on KALLSYMS
 447         help
 448            If kallsyms is not working correctly, the build will fail with
 449            inconsistent kallsyms data.  If that occurs, log a bug report and
 450            turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
 451            Always say N here unless you find a bug in kallsyms, which must be
 452            reported.  KALLSYMS_EXTRA_PASS is only a temporary workaround while
 453            you wait for kallsyms to be fixed.
 454
 455
 456 config HOTPLUG
 457         bool "Support for hot-pluggable devices" if EMBEDDED
 458         default y
 459         help
 460           This option is provided for the case where no hotplug or uevent
 461           capabilities is wanted by the kernel.  You should only consider
 462           disabling this option for embedded systems that do not use modules, a
 463           dynamic /dev tree, or dynamic device discovery.  Just say Y.
 464
 465 config PRINTK
 466         default y
 467         bool "Enable support for printk" if EMBEDDED
 468         help
 469           This option enables normal printk support. Removing it
 470           eliminates most of the message strings from the kernel image
 471           and makes the kernel more or less silent. As this makes it
 472           very difficult to diagnose system problems, saying N here is
 473           strongly discouraged.
 474
 475 config BUG
 476         bool "BUG() support" if EMBEDDED
 477         default y
 478         help
 479           Disabling this option eliminates support for BUG and WARN, reducing
 480           the size of your kernel image and potentially quietly ignoring
 481           numerous fatal conditions. You should only consider disabling this
 482           option for embedded systems with no facilities for reporting errors.
 483           Just say Y.
 484
 485 config ELF_CORE
 486         default y
 487         bool "Enable ELF core dumps" if EMBEDDED
 488         help
 489           Enable support for generating core dumps. Disabling saves about 4k.
 490
 491 config BASE_FULL
 492         default y
 493         bool "Enable full-sized data structures for core" if EMBEDDED
 494         help
 495           Disabling this option reduces the size of miscellaneous core
 496           kernel data structures. This saves memory on small machines,
 497           but may reduce performance.
 498
 499 config FUTEX
 500         bool "Enable futex support" if EMBEDDED
 501         default y
 502         select RT_MUTEXES
 503         help
 504           Disabling this option will cause the kernel to be built without
 505           support for "fast userspace mutexes".  The resulting kernel may not
 506           run glibc-based applications correctly.
 507
 508 config ANON_INODES
 509         bool
 510
 511 config EPOLL
 512         bool "Enable eventpoll support" if EMBEDDED
 513         default y
 514         select ANON_INODES
 515         help
 516           Disabling this option will cause the kernel to be built without
 517           support for epoll family of system calls.
 518
 519 config SIGNALFD
 520         bool "Enable signalfd() system call" if EMBEDDED
 521         select ANON_INODES
 522         default y
 523         help
 524           Enable the signalfd() system call that allows to receive signals
 525           on a file descriptor.
 526
 527           If unsure, say Y.
 528
 529 config TIMERFD
 530         bool "Enable timerfd() system call" if EMBEDDED
 531         select ANON_INODES
 532         depends on BROKEN
 533         default y
 534         help
 535           Enable the timerfd() system call that allows to receive timer
 536           events on a file descriptor.
 537
 538           If unsure, say Y.
 539
 540 config EVENTFD
 541         bool "Enable eventfd() system call" if EMBEDDED
 542         select ANON_INODES
 543         default y
 544         help
 545           Enable the eventfd() system call that allows to receive both
 546           kernel notification (ie. KAIO) or userspace notifications.
 547
 548           If unsure, say Y.
 549
 550 config SHMEM
 551         bool "Use full shmem filesystem" if EMBEDDED
 552         default y
 553         depends on MMU
 554         help
 555           The shmem is an internal filesystem used to manage shared memory.
 556           It is backed by swap and manages resource limits. It is also exported
 557           to userspace as tmpfs if TMPFS is enabled. Disabling this
 558           option replaces shmem and tmpfs with the much simpler ramfs code,
 559           which may be appropriate on small systems without swap.
 560
 561 config VM_EVENT_COUNTERS
 562         default y
 563         bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
 564         help
 565           VM event counters are needed for event counts to be shown.
 566           This option allows the disabling of the VM event counters
 567           on EMBEDDED systems.  /proc/vmstat will only show page counts
 568           if VM event counters are disabled.
 569
 570 config SLUB_DEBUG
 571         default y
 572         bool "Enable SLUB debugging support" if EMBEDDED
 573         depends on SLUB
 574         help
 575           SLUB has extensive debug support features. Disabling these can
 576           result in significant savings in code size. This also disables
 577           SLUB sysfs support. /sys/slab will not exist and there will be
 578           no support for cache validation etc.
 579
 580 choice
 581         prompt "Choose SLAB allocator"
 582         default SLUB
 583         help
 584            This option allows to select a slab allocator.
 585
 586 config SLAB
 587         bool "SLAB"
 588         help
 589           The regular slab allocator that is established and known to work
 590           well in all environments. It organizes cache hot objects in
 591           per cpu and per node queues. SLAB is the default choice for
 592           a slab allocator.
 593
 594 config SLUB
 595         bool "SLUB (Unqueued Allocator)"
 596         help
 597            SLUB is a slab allocator that minimizes cache line usage
 598            instead of managing queues of cached objects (SLAB approach).
 599            Per cpu caching is realized using slabs of objects instead
 600            of queues of objects. SLUB can use memory efficiently
 601            and has enhanced diagnostics.
 602
 603 config SLOB
 604         depends on EMBEDDED
 605         bool "SLOB (Simple Allocator)"
 606         help
 607            SLOB replaces the SLAB allocator with a drastically simpler
 608            allocator.  SLOB is more space efficient than SLAB but does not
 609            scale well (single lock for all operations) and is also highly
 610            susceptible to fragmentation. SLUB can accomplish a higher object
 611            density. It is usually better to use SLUB instead of SLOB.
 612
 613 endchoice
 614
 615 endmenu         # General setup
 616
 617 config RT_MUTEXES
 618         boolean
 619         select PLIST
 620
 621 config TINY_SHMEM
 622         default !SHMEM
 623         bool
 624
 625 config BASE_SMALL
 626         int
 627         default 0 if BASE_FULL
 628         default 1 if !BASE_FULL
 629
 630 menuconfig MODULES
 631         bool "Enable loadable module support"
 632         help
 633           Kernel modules are small pieces of compiled code which can
 634           be inserted in the running kernel, rather than being
 635           permanently built into the kernel.  You use the "modprobe"
 636           tool to add (and sometimes remove) them.  If you say Y here,
 637           many parts of the kernel can be built as modules (by
 638           answering M instead of Y where indicated): this is most
 639           useful for infrequently used options which are not required
 640           for booting.  For more information, see the man pages for
 641           modprobe, lsmod, modinfo, insmod and rmmod.
 642
 643           If you say Y here, you will need to run "make
 644           modules_install" to put the modules under /lib/modules/
 645           where modprobe can find them (you may need to be root to do
 646           this).
 647
 648           If unsure, say Y.
 649
 650 config MODULE_UNLOAD
 651         bool "Module unloading"
 652         depends on MODULES
 653         help
 654           Without this option you will not be able to unload any
 655           modules (note that some modules may not be unloadable
 656           anyway), which makes your kernel slightly smaller and
 657           simpler.  If unsure, say Y.
 658
 659 config MODULE_FORCE_UNLOAD
 660         bool "Forced module unloading"
 661         depends on MODULE_UNLOAD && EXPERIMENTAL
 662         help
 663           This option allows you to force a module to unload, even if the
 664           kernel believes it is unsafe: the kernel will remove the module
 665           without waiting for anyone to stop using it (using the -f option to
 666           rmmod).  This is mainly for kernel developers and desperate users.
 667           If unsure, say N.
 668
 669 config MODVERSIONS
 670         bool "Module versioning support"
 671         depends on MODULES
 672         help
 673           Usually, you have to use modules compiled with your kernel.
 674           Saying Y here makes it sometimes possible to use modules
 675           compiled for different kernels, by adding enough information
 676           to the modules to (hopefully) spot any changes which would
 677           make them incompatible with the kernel you are running.  If
 678           unsure, say N.
 679
 680 config MODULE_SRCVERSION_ALL
 681         bool "Source checksum for all modules"
 682         depends on MODULES
 683         help
 684           Modules which contain a MODULE_VERSION get an extra "srcversion"
 685           field inserted into their modinfo section, which contains a
 686           sum of the source files which made it.  This helps maintainers
 687           see exactly which source was used to build a module (since
 688           others sometimes change the module source without updating
 689           the version).  With this option, such a "srcversion" field
 690           will be created for all modules.  If unsure, say N.
 691
 692 config KMOD
 693         bool "Automatic kernel module loading"
 694         depends on MODULES
 695         help
 696           Normally when you have selected some parts of the kernel to
 697           be created as kernel modules, you must load them (using the
 698           "modprobe" command) before you can use them. If you say Y
 699           here, some parts of the kernel will be able to load modules
 700           automatically: when a part of the kernel needs a module, it
 701           runs modprobe with the appropriate arguments, thereby
 702           loading the module if it is available.  If unsure, say Y.
 703
 704 config STOP_MACHINE
 705         bool
 706         default y
 707         depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
 708         help
 709           Need stop_machine() primitive.
 710
 711 source "block/Kconfig"
 712
 713 config PREEMPT_NOTIFIERS
 714         bool