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init/Kconfig 36.4 KB
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  config ARCH
  	string
  	option env="ARCH"
  
  config KERNELVERSION
  	string
  	option env="KERNELVERSION"
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  config DEFCONFIG_LIST
  	string
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  	depends on !UML
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  	option defconfig_list
  	default "/lib/modules/$UNAME_RELEASE/.config"
  	default "/etc/kernel-config"
  	default "/boot/config-$UNAME_RELEASE"
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  	default "$ARCH_DEFCONFIG"
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  	default "arch/$ARCH/defconfig"
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  menu "General setup"
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  config EXPERIMENTAL
  	bool "Prompt for development and/or incomplete code/drivers"
  	---help---
  	  Some of the various things that Linux supports (such as network
  	  drivers, file systems, network protocols, etc.) can be in a state
  	  of development where the functionality, stability, or the level of
  	  testing is not yet high enough for general use. This is usually
  	  known as the "alpha-test" phase among developers. If a feature is
  	  currently in alpha-test, then the developers usually discourage
  	  uninformed widespread use of this feature by the general public to
  	  avoid "Why doesn't this work?" type mail messages. However, active
  	  testing and use of these systems is welcomed. Just be aware that it
  	  may not meet the normal level of reliability or it may fail to work
  	  in some special cases. Detailed bug reports from people familiar
  	  with the kernel internals are usually welcomed by the developers
  	  (before submitting bug reports, please read the documents
  	  <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>,
  	  <file:Documentation/BUG-HUNTING>, and
  	  <file:Documentation/oops-tracing.txt> in the kernel source).
  
  	  This option will also make obsoleted drivers available. These are
  	  drivers that have been replaced by something else, and/or are
  	  scheduled to be removed in a future kernel release.
  
  	  Unless you intend to help test and develop a feature or driver that
  	  falls into this category, or you have a situation that requires
  	  using these features, you should probably say N here, which will
  	  cause the configurator to present you with fewer choices. If
  	  you say Y here, you will be offered the choice of using features or
  	  drivers that are currently considered to be in the alpha-test phase.
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  config BROKEN
  	bool
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  config BROKEN_ON_SMP
  	bool
  	depends on BROKEN || !SMP
  	default y
  
  config LOCK_KERNEL
  	bool
  	depends on SMP || PREEMPT
  	default y
  
  config INIT_ENV_ARG_LIMIT
  	int
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  	default 32 if !UML
  	default 128 if UML
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  	help
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  	  Maximum of each of the number of arguments and environment
  	  variables passed to init from the kernel command line.
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  config LOCALVERSION
  	string "Local version - append to kernel release"
  	help
  	  Append an extra string to the end of your kernel version.
  	  This will show up when you type uname, for example.
  	  The string you set here will be appended after the contents of
  	  any files with a filename matching localversion* in your
  	  object and source tree, in that order.  Your total string can
  	  be a maximum of 64 characters.
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  config LOCALVERSION_AUTO
  	bool "Automatically append version information to the version string"
  	default y
  	help
  	  This will try to automatically determine if the current tree is a
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  	  release tree by looking for git tags that belong to the current
  	  top of tree revision.
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  	  A string of the format -gxxxxxxxx will be added to the localversion
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  	  if a git-based tree is found.  The string generated by this will be
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  	  appended after any matching localversion* files, and after the value
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  	  set in CONFIG_LOCALVERSION.
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  	  (The actual string used here is the first eight characters produced
  	  by running the command:
  
  	    $ git rev-parse --verify HEAD
  
  	  which is done within the script "scripts/setlocalversion".)
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  config HAVE_KERNEL_GZIP
  	bool
  
  config HAVE_KERNEL_BZIP2
  	bool
  
  config HAVE_KERNEL_LZMA
  	bool
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  choice
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  	prompt "Kernel compression mode"
  	default KERNEL_GZIP
  	depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA
  	help
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  	  The linux kernel is a kind of self-extracting executable.
  	  Several compression algorithms are available, which differ
  	  in efficiency, compression and decompression speed.
  	  Compression speed is only relevant when building a kernel.
  	  Decompression speed is relevant at each boot.
  
  	  If you have any problems with bzip2 or lzma compressed
  	  kernels, mail me (Alain Knaff) <alain@knaff.lu>. (An older
  	  version of this functionality (bzip2 only), for 2.4, was
  	  supplied by Christian Ludwig)
  
  	  High compression options are mostly useful for users, who
  	  are low on disk space (embedded systems), but for whom ram
  	  size matters less.
  
  	  If in doubt, select 'gzip'
  
  config KERNEL_GZIP
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  	bool "Gzip"
  	depends on HAVE_KERNEL_GZIP
  	help
  	  The old and tried gzip compression. Its compression ratio is
  	  the poorest among the 3 choices; however its speed (both
  	  compression and decompression) is the fastest.
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  config KERNEL_BZIP2
  	bool "Bzip2"
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  	depends on HAVE_KERNEL_BZIP2
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  	help
  	  Its compression ratio and speed is intermediate.
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  	  Decompression speed is slowest among the three.  The kernel
  	  size is about 10% smaller with bzip2, in comparison to gzip.
  	  Bzip2 uses a large amount of memory. For modern kernels you
  	  will need at least 8MB RAM or more for booting.
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  config KERNEL_LZMA
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  	bool "LZMA"
  	depends on HAVE_KERNEL_LZMA
  	help
  	  The most recent compression algorithm.
  	  Its ratio is best, decompression speed is between the other
  	  two. Compression is slowest.	The kernel size is about 33%
  	  smaller with LZMA in comparison to gzip.
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  endchoice
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  config SWAP
  	bool "Support for paging of anonymous memory (swap)"
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  	depends on MMU && BLOCK
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  	default y
  	help
  	  This option allows you to choose whether you want to have support
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  	  for so called swap devices or swap files in your kernel that are
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  	  used to provide more virtual memory than the actual RAM present
  	  in your computer.  If unsure say Y.
  
  config SYSVIPC
  	bool "System V IPC"
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  	---help---
  	  Inter Process Communication is a suite of library functions and
  	  system calls which let processes (running programs) synchronize and
  	  exchange information. It is generally considered to be a good thing,
  	  and some programs won't run unless you say Y here. In particular, if
  	  you want to run the DOS emulator dosemu under Linux (read the
  	  DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>),
  	  you'll need to say Y here.
  
  	  You can find documentation about IPC with "info ipc" and also in
  	  section 6.4 of the Linux Programmer's Guide, available from
  	  <http://www.tldp.org/guides.html>.
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  config SYSVIPC_SYSCTL
  	bool
  	depends on SYSVIPC
  	depends on SYSCTL
  	default y
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  config POSIX_MQUEUE
  	bool "POSIX Message Queues"
  	depends on NET && EXPERIMENTAL
  	---help---
  	  POSIX variant of message queues is a part of IPC. In POSIX message
  	  queues every message has a priority which decides about succession
  	  of receiving it by a process. If you want to compile and run
  	  programs written e.g. for Solaris with use of its POSIX message
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  	  queues (functions mq_*) say Y here.
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  	  POSIX message queues are visible as a filesystem called 'mqueue'
  	  and can be mounted somewhere if you want to do filesystem
  	  operations on message queues.
  
  	  If unsure, say Y.
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  config POSIX_MQUEUE_SYSCTL
  	bool
  	depends on POSIX_MQUEUE
  	depends on SYSCTL
  	default y
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  config BSD_PROCESS_ACCT
  	bool "BSD Process Accounting"
  	help
  	  If you say Y here, a user level program will be able to instruct the
  	  kernel (via a special system call) to write process accounting
  	  information to a file: whenever a process exits, information about
  	  that process will be appended to the file by the kernel.  The
  	  information includes things such as creation time, owning user,
  	  command name, memory usage, controlling terminal etc. (the complete
  	  list is in the struct acct in <file:include/linux/acct.h>).  It is
  	  up to the user level program to do useful things with this
  	  information.  This is generally a good idea, so say Y.
  
  config BSD_PROCESS_ACCT_V3
  	bool "BSD Process Accounting version 3 file format"
  	depends on BSD_PROCESS_ACCT
  	default n
  	help
  	  If you say Y here, the process accounting information is written
  	  in a new file format that also logs the process IDs of each
  	  process and it's parent. Note that this file format is incompatible
  	  with previous v0/v1/v2 file formats, so you will need updated tools
  	  for processing it. A preliminary version of these tools is available
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  	  at <http://www.gnu.org/software/acct/>.
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  config TASKSTATS
  	bool "Export task/process statistics through netlink (EXPERIMENTAL)"
  	depends on NET
  	default n
  	help
  	  Export selected statistics for tasks/processes through the
  	  generic netlink interface. Unlike BSD process accounting, the
  	  statistics are available during the lifetime of tasks/processes as
  	  responses to commands. Like BSD accounting, they are sent to user
  	  space on task exit.
  
  	  Say N if unsure.
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  config TASK_DELAY_ACCT
  	bool "Enable per-task delay accounting (EXPERIMENTAL)"
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  	depends on TASKSTATS
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  	help
  	  Collect information on time spent by a task waiting for system
  	  resources like cpu, synchronous block I/O completion and swapping
  	  in pages. Such statistics can help in setting a task's priorities
  	  relative to other tasks for cpu, io, rss limits etc.
  
  	  Say N if unsure.
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  config TASK_XACCT
  	bool "Enable extended accounting over taskstats (EXPERIMENTAL)"
  	depends on TASKSTATS
  	help
  	  Collect extended task accounting data and send the data
  	  to userland for processing over the taskstats interface.
  
  	  Say N if unsure.
  
  config TASK_IO_ACCOUNTING
  	bool "Enable per-task storage I/O accounting (EXPERIMENTAL)"
  	depends on TASK_XACCT
  	help
  	  Collect information on the number of bytes of storage I/O which this
  	  task has caused.
  
  	  Say N if unsure.
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  config AUDIT
  	bool "Auditing support"
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  	depends on NET
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  	help
  	  Enable auditing infrastructure that can be used with another
  	  kernel subsystem, such as SELinux (which requires this for
  	  logging of avc messages output).  Does not do system-call
  	  auditing without CONFIG_AUDITSYSCALL.
  
  config AUDITSYSCALL
  	bool "Enable system-call auditing support"
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  	depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64|| SUPERH)
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  	default y if SECURITY_SELINUX
  	help
  	  Enable low-overhead system-call auditing infrastructure that
  	  can be used independently or with another kernel subsystem,
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  	  such as SELinux.  To use audit's filesystem watch feature, please
  	  ensure that INOTIFY is configured.
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  config AUDIT_TREE
  	def_bool y
  	depends on AUDITSYSCALL && INOTIFY
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  menu "RCU Subsystem"
  
  choice
  	prompt "RCU Implementation"
  	default CLASSIC_RCU
  
  config CLASSIC_RCU
  	bool "Classic RCU"
  	help
  	  This option selects the classic RCU implementation that is
  	  designed for best read-side performance on non-realtime
  	  systems.
  
  	  Select this option if you are unsure.
  
  config TREE_RCU
  	bool "Tree-based hierarchical RCU"
  	help
  	  This option selects the RCU implementation that is
  	  designed for very large SMP system with hundreds or
  	  thousands of CPUs.
  
  config PREEMPT_RCU
  	bool "Preemptible RCU"
  	depends on PREEMPT
  	help
  	  This option reduces the latency of the kernel by making certain
  	  RCU sections preemptible. Normally RCU code is non-preemptible, if
  	  this option is selected then read-only RCU sections become
  	  preemptible. This helps latency, but may expose bugs due to
  	  now-naive assumptions about each RCU read-side critical section
  	  remaining on a given CPU through its execution.
  
  endchoice
  
  config RCU_TRACE
  	bool "Enable tracing for RCU"
  	depends on TREE_RCU || PREEMPT_RCU
  	help
  	  This option provides tracing in RCU which presents stats
  	  in debugfs for debugging RCU implementation.
  
  	  Say Y here if you want to enable RCU tracing
  	  Say N if you are unsure.
  
  config RCU_FANOUT
  	int "Tree-based hierarchical RCU fanout value"
  	range 2 64 if 64BIT
  	range 2 32 if !64BIT
  	depends on TREE_RCU
  	default 64 if 64BIT
  	default 32 if !64BIT
  	help
  	  This option controls the fanout of hierarchical implementations
  	  of RCU, allowing RCU to work efficiently on machines with
  	  large numbers of CPUs.  This value must be at least the cube
  	  root of NR_CPUS, which allows NR_CPUS up to 32,768 for 32-bit
  	  systems and up to 262,144 for 64-bit systems.
  
  	  Select a specific number if testing RCU itself.
  	  Take the default if unsure.
  
  config RCU_FANOUT_EXACT
  	bool "Disable tree-based hierarchical RCU auto-balancing"
  	depends on TREE_RCU
  	default n
  	help
  	  This option forces use of the exact RCU_FANOUT value specified,
  	  regardless of imbalances in the hierarchy.  This is useful for
  	  testing RCU itself, and might one day be useful on systems with
  	  strong NUMA behavior.
  
  	  Without RCU_FANOUT_EXACT, the code will balance the hierarchy.
  
  	  Say N if unsure.
  
  config TREE_RCU_TRACE
  	def_bool RCU_TRACE && TREE_RCU
  	select DEBUG_FS
  	help
  	  This option provides tracing for the TREE_RCU implementation,
  	  permitting Makefile to trivially select kernel/rcutree_trace.c.
  
  config PREEMPT_RCU_TRACE
  	def_bool RCU_TRACE && PREEMPT_RCU
  	select DEBUG_FS
  	help
  	  This option provides tracing for the PREEMPT_RCU implementation,
  	  permitting Makefile to trivially select kernel/rcupreempt_trace.c.
  
  endmenu # "RCU Subsystem"
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  config IKCONFIG
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  	tristate "Kernel .config support"
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  	---help---
  	  This option enables the complete Linux kernel ".config" file
  	  contents to be saved in the kernel. It provides documentation
  	  of which kernel options are used in a running kernel or in an
  	  on-disk kernel.  This information can be extracted from the kernel
  	  image file with the script scripts/extract-ikconfig and used as
  	  input to rebuild the current kernel or to build another kernel.
  	  It can also be extracted from a running kernel by reading
  	  /proc/config.gz if enabled (below).
  
  config IKCONFIG_PROC
  	bool "Enable access to .config through /proc/config.gz"
  	depends on IKCONFIG && PROC_FS
  	---help---
  	  This option enables access to the kernel configuration file
  	  through /proc/config.gz.
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  config LOG_BUF_SHIFT
  	int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"
  	range 12 21
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  	default 17
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  	help
  	  Select kernel log buffer size as a power of 2.
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  	  Examples:
  	  	     17 => 128 KB
  		     16 => 64 KB
  	             15 => 32 KB
  	             14 => 16 KB
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  		     13 =>  8 KB
  		     12 =>  4 KB
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  #
  # Architectures with an unreliable sched_clock() should select this:
  #
  config HAVE_UNSTABLE_SCHED_CLOCK
  	bool
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  config GROUP_SCHED
  	bool "Group CPU scheduler"
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  	depends on EXPERIMENTAL
  	default n
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  	help
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  	  This feature lets CPU scheduler recognize task groups and control CPU
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  	  bandwidth allocation to such task groups.
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  	  In order to create a group from arbitrary set of processes, use
  	  CONFIG_CGROUPS. (See Control Group support.)
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429

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  config FAIR_GROUP_SCHED
  	bool "Group scheduling for SCHED_OTHER"
  	depends on GROUP_SCHED
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433
  	default GROUP_SCHED
052f1dc7e   Peter Zijlstra   sched: rt-group: ...
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  config RT_GROUP_SCHED
  	bool "Group scheduling for SCHED_RR/FIFO"
  	depends on EXPERIMENTAL
  	depends on GROUP_SCHED
  	default n
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  	help
  	  This feature lets you explicitly allocate real CPU bandwidth
  	  to users or control groups (depending on the "Basis for grouping tasks"
  	  setting below. If enabled, it will also make it impossible to
  	  schedule realtime tasks for non-root users until you allocate
  	  realtime bandwidth for them.
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446
  	  See Documentation/scheduler/sched-rt-group.txt for more information.
052f1dc7e   Peter Zijlstra   sched: rt-group: ...
447

24e377a83   Srivatsa Vaddagiri   sched: add fair-u...
448
  choice
052f1dc7e   Peter Zijlstra   sched: rt-group: ...
449
  	depends on GROUP_SCHED
24e377a83   Srivatsa Vaddagiri   sched: add fair-u...
450
  	prompt "Basis for grouping tasks"
052f1dc7e   Peter Zijlstra   sched: rt-group: ...
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  	default USER_SCHED
24e377a83   Srivatsa Vaddagiri   sched: add fair-u...
452

052f1dc7e   Peter Zijlstra   sched: rt-group: ...
453
  config USER_SCHED
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  	bool "user id"
  	help
  	  This option will choose userid as the basis for grouping
  	  tasks, thus providing equal CPU bandwidth to each user.
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458

052f1dc7e   Peter Zijlstra   sched: rt-group: ...
459
  config CGROUP_SCHED
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  	bool "Control groups"
   	depends on CGROUPS
   	help
  	  This option allows you to create arbitrary task groups
  	  using the "cgroup" pseudo filesystem and control
  	  the cpu bandwidth allocated to each such task group.
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  	  Refer to Documentation/cgroups/cgroups.txt for more
  	  information on "cgroup" pseudo filesystem.
68318b8e0   Srivatsa Vaddagiri   Hook up group sch...
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24e377a83   Srivatsa Vaddagiri   sched: add fair-u...
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  endchoice
23964d2d0   Li Zefan   cgroups: clean up...
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  menuconfig CGROUPS
  	boolean "Control Group support"
5cdc38f98   KAMEZAWA Hiroyuki   cgroups: make cgr...
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  	help
23964d2d0   Li Zefan   cgroups: clean up...
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  	  This option adds support for grouping sets of processes together, for
5cdc38f98   KAMEZAWA Hiroyuki   cgroups: make cgr...
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  	  use with process control subsystems such as Cpusets, CFS, memory
  	  controls or device isolation.
  	  See
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477
  		- Documentation/scheduler/sched-design-CFS.txt	(CFS)
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  		- Documentation/cgroups/ (features for grouping, isolation
  					  and resource control)
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  	  Say N if unsure.
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  if CGROUPS
5cdc38f98   KAMEZAWA Hiroyuki   cgroups: make cgr...
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  config CGROUP_DEBUG
  	bool "Example debug cgroup subsystem"
  	depends on CGROUPS
  	default n
  	help
  	  This option enables a simple cgroup subsystem that
  	  exports useful debugging information about the cgroups
23964d2d0   Li Zefan   cgroups: clean up...
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  	  framework.
5cdc38f98   KAMEZAWA Hiroyuki   cgroups: make cgr...
491

23964d2d0   Li Zefan   cgroups: clean up...
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  	  Say N if unsure.
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  config CGROUP_NS
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  	bool "Namespace cgroup subsystem"
  	depends on CGROUPS
  	help
  	  Provides a simple namespace cgroup subsystem to
  	  provide hierarchical naming of sets of namespaces,
  	  for instance virtual servers and checkpoint/restart
  	  jobs.
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  config CGROUP_FREEZER
23964d2d0   Li Zefan   cgroups: clean up...
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  	bool "Freezer cgroup subsystem"
  	depends on CGROUPS
  	help
  	  Provides a way to freeze and unfreeze all tasks in a
5cdc38f98   KAMEZAWA Hiroyuki   cgroups: make cgr...
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  	  cgroup.
  
  config CGROUP_DEVICE
  	bool "Device controller for cgroups"
  	depends on CGROUPS && EXPERIMENTAL
  	help
  	  Provides a cgroup implementing whitelists for devices which
  	  a process in the cgroup can mknod or open.
  
  config CPUSETS
  	bool "Cpuset support"
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  	depends on CGROUPS
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  	help
  	  This option will let you create and manage CPUSETs which
  	  allow dynamically partitioning a system into sets of CPUs and
  	  Memory Nodes and assigning tasks to run only within those sets.
  	  This is primarily useful on large SMP or NUMA systems.
  
  	  Say N if unsure.
23964d2d0   Li Zefan   cgroups: clean up...
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  config PROC_PID_CPUSET
  	bool "Include legacy /proc/<pid>/cpuset file"
  	depends on CPUSETS
  	default y
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  config CGROUP_CPUACCT
  	bool "Simple CPU accounting cgroup subsystem"
  	depends on CGROUPS
  	help
  	  Provides a simple Resource Controller for monitoring the
23964d2d0   Li Zefan   cgroups: clean up...
536
  	  total CPU consumed by the tasks in a cgroup.
d842de871   Srivatsa Vaddagiri   sched: cpu accoun...
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e552b6617   Pavel Emelianov   Memory controller...
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  config RESOURCE_COUNTERS
  	bool "Resource counters"
  	help
  	  This option enables controller independent resource accounting
23964d2d0   Li Zefan   cgroups: clean up...
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  	  infrastructure that works with cgroups.
e552b6617   Pavel Emelianov   Memory controller...
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  	depends on CGROUPS
00f0b8259   Balbir Singh   Memory controller...
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  config CGROUP_MEM_RES_CTLR
  	bool "Memory Resource Controller for Control Groups"
  	depends on CGROUPS && RESOURCE_COUNTERS
cf475ad28   Balbir Singh   cgroups: add an o...
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  	select MM_OWNER
00f0b8259   Balbir Singh   Memory controller...
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  	help
84ad6d700   KAMEZAWA Hiroyuki   memcg: update men...
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  	  Provides a memory resource controller that manages both anonymous
21acb9caa   Thadeu Lima de Souza Cascardo   trivial: fix wher...
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  	  memory and page cache. (See Documentation/cgroups/memory.txt)
00f0b8259   Balbir Singh   Memory controller...
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552
  
  	  Note that setting this option increases fixed memory overhead
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  	  associated with each page of memory in the system. By this,
  	  20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
  	  usage tracking struct at boot. Total amount of this is printed out
  	  at boot.
00f0b8259   Balbir Singh   Memory controller...
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  	  Only enable when you're ok with these trade offs and really
84ad6d700   KAMEZAWA Hiroyuki   memcg: update men...
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  	  sure you need the memory resource controller. Even when you enable
  	  this, you can set "cgroup_disable=memory" at your boot option to
  	  disable memory resource controller and you can avoid overheads.
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  	  (and lose benefits of memory resource controller)
00f0b8259   Balbir Singh   Memory controller...
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cf475ad28   Balbir Singh   cgroups: add an o...
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  	  This config option also selects MM_OWNER config option, which
  	  could in turn add some fork/exit overhead.
c077719be   KAMEZAWA Hiroyuki   memcg: mem+swap c...
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  config CGROUP_MEM_RES_CTLR_SWAP
  	bool "Memory Resource Controller Swap Extension(EXPERIMENTAL)"
  	depends on CGROUP_MEM_RES_CTLR && SWAP && EXPERIMENTAL
  	help
  	  Add swap management feature to memory resource controller. When you
  	  enable this, you can limit mem+swap usage per cgroup. In other words,
  	  when you disable this, memory resource controller has no cares to
  	  usage of swap...a process can exhaust all of the swap. This extension
  	  is useful when you want to avoid exhaustion swap but this itself
  	  adds more overheads and consumes memory for remembering information.
  	  Especially if you use 32bit system or small memory system, please
  	  be careful about enabling this. When memory resource controller
  	  is disabled by boot option, this will be automatically disabled and
  	  there will be no overhead from this. Even when you set this config=y,
  	  if boot option "noswapaccount" is set, swap will not be accounted.
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  	  Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
  	  size is 4096bytes, 512k per 1Gbytes of swap.
c077719be   KAMEZAWA Hiroyuki   memcg: mem+swap c...
583

23964d2d0   Li Zefan   cgroups: clean up...
584
  endif # CGROUPS
c077719be   KAMEZAWA Hiroyuki   memcg: mem+swap c...
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23964d2d0   Li Zefan   cgroups: clean up...
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  config MM_OWNER
  	bool
5cdc38f98   KAMEZAWA Hiroyuki   cgroups: make cgr...
588

88a22c985   Kay Sievers   CONFIG_SYSFS_DEPR...
589
  config SYSFS_DEPRECATED
d47846c58   Ingo Molnar   sysfs: CONFIG_SYS...
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  	bool
  
  config SYSFS_DEPRECATED_V2
fce3e804c   Kay Sievers   sysfs: clarify SY...
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  	bool "Create deprecated sysfs layout for older userspace tools"
9148fe876   Randy Dunlap   sysfs: make SYSFS...
594
  	depends on SYSFS
88a22c985   Kay Sievers   CONFIG_SYSFS_DEPR...
595
  	default y
d47846c58   Ingo Molnar   sysfs: CONFIG_SYS...
596
  	select SYSFS_DEPRECATED
88a22c985   Kay Sievers   CONFIG_SYSFS_DEPR...
597
  	help
fce3e804c   Kay Sievers   sysfs: clarify SY...
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  	  This option switches the layout of sysfs to the deprecated
  	  version.
  
  	  The current sysfs layout features a unified device tree at
  	  /sys/devices/, which is able to express a hierarchy between
  	  class devices. If the deprecated option is set to Y, the
  	  unified device tree is split into a bus device tree at
  	  /sys/devices/ and several individual class device trees at
  	  /sys/class/. The class and bus devices will be connected by
  	  "<subsystem>:<name>" and the "device" links. The "block"
  	  class devices, will not show up in /sys/class/block/. Some
  	  subsystems will suppress the creation of some devices which
  	  depend on the unified device tree.
  
  	  This option is not a pure compatibility option that can
  	  be safely enabled on newer distributions. It will change the
  	  layout of sysfs to the non-extensible deprecated version,
  	  and disable some features, which can not be exported without
  	  confusing older userspace tools. Since 2007/2008 all major
  	  distributions do not enable this option, and ship no tools which
  	  depend on the deprecated layout or this option.
  
  	  If you are using a new kernel on an older distribution, or use
  	  older userspace tools, you might need to say Y here. Do not say Y,
  	  if the original kernel, that came with your distribution, has
  	  this option set to N.
88a22c985   Kay Sievers   CONFIG_SYSFS_DEPR...
624

b86ff981a   Jens Axboe   [PATCH] relay: mi...
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  config RELAY
  	bool "Kernel->user space relay support (formerly relayfs)"
  	help
  	  This option enables support for relay interface support in
  	  certain file systems (such as debugfs).
  	  It is designed to provide an efficient mechanism for tools and
  	  facilities to relay large amounts of data from kernel space to
  	  user space.
  
  	  If unsure, say N.
c5289a694   Pavel Emelyanov   namespaces: add t...
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  config NAMESPACES
  	bool "Namespaces support" if EMBEDDED
  	default !EMBEDDED
  	help
  	  Provides the way to make tasks work with different objects using
  	  the same id. For example same IPC id may refer to different objects
  	  or same user id or pid may refer to different tasks when used in
  	  different namespaces.
58bfdd6de   Pavel Emelyanov   namespaces: move ...
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  config UTS_NS
  	bool "UTS namespace"
  	depends on NAMESPACES
  	help
  	  In this namespace tasks see different info provided with the
  	  uname() system call
ae5e1b22f   Pavel Emelyanov   namespaces: move ...
649
650
  config IPC_NS
  	bool "IPC namespace"
614b84cf4   Serge E. Hallyn   namespaces: mqueu...
651
  	depends on NAMESPACES && (SYSVIPC || POSIX_MQUEUE)
ae5e1b22f   Pavel Emelyanov   namespaces: move ...
652
653
  	help
  	  In this namespace tasks work with IPC ids which correspond to
614b84cf4   Serge E. Hallyn   namespaces: mqueu...
654
  	  different IPC objects in different namespaces.
ae5e1b22f   Pavel Emelyanov   namespaces: move ...
655

aee16ce73   Pavel Emelyanov   namespaces: clean...
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  config USER_NS
  	bool "User namespace (EXPERIMENTAL)"
  	depends on NAMESPACES && EXPERIMENTAL
  	help
  	  This allows containers, i.e. vservers, to use user namespaces
  	  to provide different user info for different servers.
  	  If unsure, say N.
74bd59bb3   Pavel Emelyanov   namespaces: clean...
663
664
665
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  config PID_NS
  	bool "PID Namespaces (EXPERIMENTAL)"
  	default n
  	depends on NAMESPACES && EXPERIMENTAL
  	help
12d2b8f95   Heikki Orsila   kconfig: fix typo...
668
  	  Support process id namespaces.  This allows having multiple
692105b8a   Matt LaPlante   trivial: fix typo...
669
  	  processes with the same pid as long as they are in different
74bd59bb3   Pavel Emelyanov   namespaces: clean...
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  	  pid namespaces.  This is a building block of containers.
  
  	  Unless you want to work with an experimental feature
  	  say N here.
d6eb633fe   Matt Helsley   net: Move config ...
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  config NET_NS
  	bool "Network namespace"
  	default n
  	depends on NAMESPACES && EXPERIMENTAL && NET
  	help
  	  Allow user space to create what appear to be multiple instances
  	  of the network stack.
f991633de   Dimitri Gorokhovik   [PATCH] initramfs...
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  config BLK_DEV_INITRD
  	bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
  	depends on BROKEN || !FRV
  	help
  	  The initial RAM filesystem is a ramfs which is loaded by the
  	  boot loader (loadlin or lilo) and that is mounted as root
  	  before the normal boot procedure. It is typically used to
  	  load modules needed to mount the "real" root file system,
  	  etc. See <file:Documentation/initrd.txt> for details.
  
  	  If RAM disk support (BLK_DEV_RAM) is also included, this
  	  also enables initial RAM disk (initrd) support and adds
  	  15 Kbytes (more on some other architectures) to the kernel size.
  
  	  If unsure say Y.
c33df4eaa   Jean-Paul Saman   [PATCH] disable i...
696
  if BLK_DEV_INITRD
dbec48663   Sam Ravnborg   kconfig: move ini...
697
  source "usr/Kconfig"
c33df4eaa   Jean-Paul Saman   [PATCH] disable i...
698
  endif
c45b4f1f1   Linus Torvalds   Move size optimiz...
699
  config CC_OPTIMIZE_FOR_SIZE
96fffeb4b   Ingo Molnar   make CC_OPTIMIZE_...
700
  	bool "Optimize for size"
c45b4f1f1   Linus Torvalds   Move size optimiz...
701
  	default y
c45b4f1f1   Linus Torvalds   Move size optimiz...
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703
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  	help
  	  Enabling this option will pass "-Os" instead of "-O2" to gcc
  	  resulting in a smaller kernel.
775a7229a   jkacur   Kconfig/init: cha...
705
  	  If unsure, say Y.
c45b4f1f1   Linus Torvalds   Move size optimiz...
706

0847062ad   Randy Dunlap   [PATCH] fix EMBED...
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  config SYSCTL
  	bool
b943c460f   Randy Dunlap   menu: fix embedde...
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  config ANON_INODES
  	bool
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
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  menuconfig EMBEDDED
  	bool "Configure standard kernel features (for small systems)"
  	help
  	  This option allows certain base kernel options and settings
            to be disabled or tweaked. This is for specialized
            environments which can tolerate a "non-standard" kernel.
            Only use this if you really know what you are doing.
ae81f9e37   Chuck Ebbert   [PATCH] Kconfig: ...
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  config UID16
  	bool "Enable 16-bit UID system calls" if EMBEDDED
09337f501   David S. Miller   sparc64: Kill CON...
720
  	depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION)
ae81f9e37   Chuck Ebbert   [PATCH] Kconfig: ...
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723
  	default y
  	help
  	  This enables the legacy 16-bit UID syscall wrappers.
b89a81712   Eric W. Biederman   [PATCH] sysctl: A...
724
  config SYSCTL_SYSCALL
0847062ad   Randy Dunlap   [PATCH] fix EMBED...
725
  	bool "Sysctl syscall support" if EMBEDDED
13bb7e37e   Eric W. Biederman   [PATCH] sysctl: U...
726
  	default y
b89a81712   Eric W. Biederman   [PATCH] sysctl: A...
727
  	select SYSCTL
ae81f9e37   Chuck Ebbert   [PATCH] Kconfig: ...
728
  	---help---
13bb7e37e   Eric W. Biederman   [PATCH] sysctl: U...
729
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  	  sys_sysctl uses binary paths that have been found challenging
  	  to properly maintain and use.  The interface in /proc/sys
  	  using paths with ascii names is now the primary path to this
  	  information.
b89a81712   Eric W. Biederman   [PATCH] sysctl: A...
733

13bb7e37e   Eric W. Biederman   [PATCH] sysctl: U...
734
735
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  	  Almost nothing using the binary sysctl interface so if you are
  	  trying to save some space it is probably safe to disable this,
  	  making your kernel marginally smaller.
b89a81712   Eric W. Biederman   [PATCH] sysctl: A...
737

13bb7e37e   Eric W. Biederman   [PATCH] sysctl: U...
738
  	  If unsure say Y here.
ae81f9e37   Chuck Ebbert   [PATCH] Kconfig: ...
739

1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
740
  config KALLSYMS
979c6a1e4   Jesper Juhl   Kconfig: fix spel...
741
  	 bool "Load all symbols for debugging/ksymoops" if EMBEDDED
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
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  	 default y
  	 help
  	   Say Y here to let the kernel print out symbolic crash information and
  	   symbolic stack backtraces. This increases the size of the kernel
  	   somewhat, as all symbols have to be loaded into the kernel image.
  
  config KALLSYMS_ALL
  	bool "Include all symbols in kallsyms"
  	depends on DEBUG_KERNEL && KALLSYMS
  	help
  	   Normally kallsyms only contains the symbols of functions, for nicer
  	   OOPS messages.  Some debuggers can use kallsyms for other
f9f97bc01   Jesper Juhl   [PATCH] kallsyms:...
754
755
  	   symbols too: say Y here to include all symbols, if you need them 
  	   and you don't care about adding 300k to the size of your kernel.
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
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  	   Say N.
  
  config KALLSYMS_EXTRA_PASS
  	bool "Do an extra kallsyms pass"
  	depends on KALLSYMS
  	help
  	   If kallsyms is not working correctly, the build will fail with
  	   inconsistent kallsyms data.  If that occurs, log a bug report and
  	   turn on KALLSYMS_EXTRA_PASS which should result in a stable build.
  	   Always say N here unless you find a bug in kallsyms, which must be
  	   reported.  KALLSYMS_EXTRA_PASS is only a temporary workaround while
  	   you wait for kallsyms to be fixed.
d59745ce3   Matt Mackall   [PATCH] clean up ...
769

5d7d18f5b   David Howells   kbuild: make it p...
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  config STRIP_ASM_SYMS
  	bool "Strip assembler-generated symbols during link"
  	default n
  	help
  	  Strip internal assembler-generated symbols during a link (symbols
  	  that look like '.Lxxx') so they don't pollute the output of
  	  get_wchan() and suchlike.
712f47cea   Greg Kroah-Hartman   [PATCH] HOTPLUG: ...
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  config HOTPLUG
  	bool "Support for hot-pluggable devices" if EMBEDDED
  	default y
  	help
  	  This option is provided for the case where no hotplug or uevent
  	  capabilities is wanted by the kernel.  You should only consider
  	  disabling this option for embedded systems that do not use modules, a
  	  dynamic /dev tree, or dynamic device discovery.  Just say Y.
d59745ce3   Matt Mackall   [PATCH] clean up ...
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  config PRINTK
  	default y
  	bool "Enable support for printk" if EMBEDDED
  	help
  	  This option enables normal printk support. Removing it
  	  eliminates most of the message strings from the kernel image
  	  and makes the kernel more or less silent. As this makes it
  	  very difficult to diagnose system problems, saying N here is
  	  strongly discouraged.
c8538a7aa   Matt Mackall   [PATCH] remove al...
794
795
796
797
798
799
800
801
802
  config BUG
  	bool "BUG() support" if EMBEDDED
  	default y
  	help
            Disabling this option eliminates support for BUG and WARN, reducing
            the size of your kernel image and potentially quietly ignoring
            numerous fatal conditions. You should only consider disabling this
            option for embedded systems with no facilities for reporting errors.
            Just say Y.
708e9a794   Matt Mackall   [PATCH] tiny: Con...
803
804
805
806
807
  config ELF_CORE
  	default y
  	bool "Enable ELF core dumps" if EMBEDDED
  	help
  	  Enable support for generating core dumps. Disabling saves about 4k.
e5e1d3cb2   Stas Sergeev   pcspkr: fix depen...
808
809
810
811
812
813
814
  config PCSPKR_PLATFORM
  	bool "Enable PC-Speaker support" if EMBEDDED
  	depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES
  	default y
  	help
            This option allows to disable the internal PC-Speaker
            support, saving some memory.
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
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818
819
820
821
822
823
824
825
  config BASE_FULL
  	default y
  	bool "Enable full-sized data structures for core" if EMBEDDED
  	help
  	  Disabling this option reduces the size of miscellaneous core
  	  kernel data structures. This saves memory on small machines,
  	  but may reduce performance.
  
  config FUTEX
  	bool "Enable futex support" if EMBEDDED
  	default y
23f78d4a0   Ingo Molnar   [PATCH] pi-futex:...
826
  	select RT_MUTEXES
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
827
828
829
830
831
832
833
834
  	help
  	  Disabling this option will cause the kernel to be built without
  	  support for "fast userspace mutexes".  The resulting kernel may not
  	  run glibc-based applications correctly.
  
  config EPOLL
  	bool "Enable eventpoll support" if EMBEDDED
  	default y
448e3cee8   Adrian Bunk   ANON_INODES shoul...
835
  	select ANON_INODES
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
836
837
838
  	help
  	  Disabling this option will cause the kernel to be built without
  	  support for epoll family of system calls.
fba2afaae   Davide Libenzi   signal/timer/even...
839
840
  config SIGNALFD
  	bool "Enable signalfd() system call" if EMBEDDED
448e3cee8   Adrian Bunk   ANON_INODES shoul...
841
  	select ANON_INODES
fba2afaae   Davide Libenzi   signal/timer/even...
842
843
844
845
846
847
  	default y
  	help
  	  Enable the signalfd() system call that allows to receive signals
  	  on a file descriptor.
  
  	  If unsure, say Y.
b215e2839   Davide Libenzi   signal/timer/even...
848
849
  config TIMERFD
  	bool "Enable timerfd() system call" if EMBEDDED
448e3cee8   Adrian Bunk   ANON_INODES shoul...
850
  	select ANON_INODES
b215e2839   Davide Libenzi   signal/timer/even...
851
852
853
854
855
856
  	default y
  	help
  	  Enable the timerfd() system call that allows to receive timer
  	  events on a file descriptor.
  
  	  If unsure, say Y.
e1ad7468c   Davide Libenzi   signal/timer/even...
857
858
  config EVENTFD
  	bool "Enable eventfd() system call" if EMBEDDED
448e3cee8   Adrian Bunk   ANON_INODES shoul...
859
  	select ANON_INODES
e1ad7468c   Davide Libenzi   signal/timer/even...
860
861
862
863
864
865
  	default y
  	help
  	  Enable the eventfd() system call that allows to receive both
  	  kernel notification (ie. KAIO) or userspace notifications.
  
  	  If unsure, say Y.
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
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870
871
872
873
874
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  config SHMEM
  	bool "Use full shmem filesystem" if EMBEDDED
  	default y
  	depends on MMU
  	help
  	  The shmem is an internal filesystem used to manage shared memory.
  	  It is backed by swap and manages resource limits. It is also exported
  	  to userspace as tmpfs if TMPFS is enabled. Disabling this
  	  option replaces shmem and tmpfs with the much simpler ramfs code,
  	  which may be appropriate on small systems without swap.
ebf3f09c6   Thomas Petazzoni   Configure out AIO...
876
877
878
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880
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882
  config AIO
  	bool "Enable AIO support" if EMBEDDED
  	default y
  	help
  	  This option enables POSIX asynchronous I/O which may by used
            by some high performance threaded applications. Disabling
            this option saves about 7k.
f8891e5e1   Christoph Lameter   [PATCH] Light wei...
883
884
885
886
  config VM_EVENT_COUNTERS
  	default y
  	bool "Enable VM event counters for /proc/vmstat" if EMBEDDED
  	help
2aea4fb61   Paul Jackson   [PATCH] CONFIG_VM...
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888
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  	  VM event counters are needed for event counts to be shown.
  	  This option allows the disabling of the VM event counters
  	  on EMBEDDED systems.  /proc/vmstat will only show page counts
  	  if VM event counters are disabled.
f8891e5e1   Christoph Lameter   [PATCH] Light wei...
891

3d1373102   Thomas Petazzoni   PCI: allow quirks...
892
893
  config PCI_QUIRKS
  	default y
61cfc7e44   Geert Uytterhoeven   PCI: PCI_QUIRKS d...
894
895
  	bool "Enable PCI quirk workarounds" if EMBEDDED
  	depends on PCI
3d1373102   Thomas Petazzoni   PCI: allow quirks...
896
897
898
899
  	help
  	  This enables workarounds for various PCI chipset
            bugs/quirks. Disable this only if your target machine is
            unaffected by PCI quirks.
41ecc55b8   Christoph Lameter   SLUB: add CONFIG_...
900
901
902
  config SLUB_DEBUG
  	default y
  	bool "Enable SLUB debugging support" if EMBEDDED
f6acb6350   Christoph Lameter   slub: #ifdef simp...
903
  	depends on SLUB && SYSFS
41ecc55b8   Christoph Lameter   SLUB: add CONFIG_...
904
905
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907
908
  	help
  	  SLUB has extensive debug support features. Disabling these can
  	  result in significant savings in code size. This also disables
  	  SLUB sysfs support. /sys/slab will not exist and there will be
  	  no support for cache validation etc.
b943c460f   Randy Dunlap   menu: fix embedde...
909
910
911
912
913
914
915
  config COMPAT_BRK
  	bool "Disable heap randomization"
  	default y
  	help
  	  Randomizing heap placement makes heap exploits harder, but it
  	  also breaks ancient binaries (including anything libc5 based).
  	  This option changes the bootup default to heap randomization
692105b8a   Matt LaPlante   trivial: fix typo...
916
  	  disabled, and can be overridden at runtime by setting
b943c460f   Randy Dunlap   menu: fix embedde...
917
918
919
  	  /proc/sys/kernel/randomize_va_space to 2.
  
  	  On non-ancient distros (post-2000 ones) N is usually a safe choice.
81819f0fc   Christoph Lameter   SLUB core
920
921
  choice
  	prompt "Choose SLAB allocator"
a0acd8208   Christoph Lameter   Make SLUB the def...
922
  	default SLUB
81819f0fc   Christoph Lameter   SLUB core
923
924
925
926
927
928
929
  	help
  	   This option allows to select a slab allocator.
  
  config SLAB
  	bool "SLAB"
  	help
  	  The regular slab allocator that is established and known to work
34013886e   Christoph Lameter   Fix spellings of ...
930
  	  well in all environments. It organizes cache hot objects in
02f562104   Simon Arlott   Kconfig: SLUB is ...
931
  	  per cpu and per node queues.
81819f0fc   Christoph Lameter   SLUB core
932
933
  
  config SLUB
81819f0fc   Christoph Lameter   SLUB core
934
935
936
937
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939
  	bool "SLUB (Unqueued Allocator)"
  	help
  	   SLUB is a slab allocator that minimizes cache line usage
  	   instead of managing queues of cached objects (SLAB approach).
  	   Per cpu caching is realized using slabs of objects instead
  	   of queues of objects. SLUB can use memory efficiently
02f562104   Simon Arlott   Kconfig: SLUB is ...
940
941
  	   and has enhanced diagnostics. SLUB is the default choice for
  	   a slab allocator.
81819f0fc   Christoph Lameter   SLUB core
942
943
  
  config SLOB
84a01c2f8   Paul Mundt   slob: sparsemem s...
944
  	depends on EMBEDDED
81819f0fc   Christoph Lameter   SLUB core
945
946
  	bool "SLOB (Simple Allocator)"
  	help
372914582   Matt Mackall   slob: correct Kco...
947
948
949
  	   SLOB replaces the stock allocator with a drastically simpler
  	   allocator. SLOB is generally more space efficient but
  	   does not perform as well on large systems.
81819f0fc   Christoph Lameter   SLUB core
950
951
  
  endchoice
125e56458   Mathieu Desnoyers   Move Kconfig.inst...
952
953
954
955
956
  config PROFILING
  	bool "Profiling support (EXPERIMENTAL)"
  	help
  	  Say Y here to enable the extended profiling support mechanisms used
  	  by profilers such as OProfile.
5f87f1121   Ingo Molnar   tracing: clean up...
957
958
959
960
  #
  # Place an empty function call at each tracepoint site. Can be
  # dynamically changed for a probe function.
  #
97e1c18e8   Mathieu Desnoyers   tracing: Kernel T...
961
  config TRACEPOINTS
5f87f1121   Ingo Molnar   tracing: clean up...
962
  	bool
97e1c18e8   Mathieu Desnoyers   tracing: Kernel T...
963

125e56458   Mathieu Desnoyers   Move Kconfig.inst...
964
965
  config MARKERS
  	bool "Activate markers"
91f73f90d   Frederic Weisbecker   tracing/markers: ...
966
  	select TRACEPOINTS
125e56458   Mathieu Desnoyers   Move Kconfig.inst...
967
968
969
  	help
  	  Place an empty function call at each marker site. Can be
  	  dynamically changed for a probe function.
fb32e03fd   Mathieu Desnoyers   Create arch/Kconfig
970
  source "arch/Kconfig"
07fe7cb7c   David Howells   Create a dynamica...
971
972
  config SLOW_WORK
  	default n
1c2d008c9   David Howells   Make CONFIG_SLOW_...
973
  	bool
07fe7cb7c   David Howells   Create a dynamica...
974
975
976
977
978
979
980
981
  	help
  	  The slow work thread pool provides a number of dynamically allocated
  	  threads that can be used by the kernel to perform operations that
  	  take a relatively long time.
  
  	  An example of this would be CacheFiles doing a path lookup followed
  	  by a series of mkdirs and a create call, all of which have to touch
  	  disk.
1c2d008c9   David Howells   Make CONFIG_SLOW_...
982
  	  See Documentation/slow-work.txt.
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
983
  endmenu		# General setup
ee7e5516b   Dmitry Eremin-Solenikov   generic: per-devi...
984
985
986
  config HAVE_GENERIC_DMA_COHERENT
  	bool
  	default n
158a96242   Linus Torvalds   Unify /proc/slabi...
987
988
989
  config SLABINFO
  	bool
  	depends on PROC_FS
0f389ec63   Christoph Lameter   slub: No need for...
990
  	depends on SLAB || SLUB_DEBUG
158a96242   Linus Torvalds   Unify /proc/slabi...
991
  	default y
ae81f9e37   Chuck Ebbert   [PATCH] Kconfig: ...
992
993
  config RT_MUTEXES
  	boolean
ae81f9e37   Chuck Ebbert   [PATCH] Kconfig: ...
994

1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
995
996
997
998
  config BASE_SMALL
  	int
  	default 0 if BASE_FULL
  	default 1 if !BASE_FULL
66da57332   Jan Engelhardt   Use menuconfig ob...
999
  menuconfig MODULES
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
  	bool "Enable loadable module support"
  	help
  	  Kernel modules are small pieces of compiled code which can
  	  be inserted in the running kernel, rather than being
  	  permanently built into the kernel.  You use the "modprobe"
  	  tool to add (and sometimes remove) them.  If you say Y here,
  	  many parts of the kernel can be built as modules (by
  	  answering M instead of Y where indicated): this is most
  	  useful for infrequently used options which are not required
  	  for booting.  For more information, see the man pages for
  	  modprobe, lsmod, modinfo, insmod and rmmod.
  
  	  If you say Y here, you will need to run "make
  	  modules_install" to put the modules under /lib/modules/
  	  where modprobe can find them (you may need to be root to do
  	  this).
  
  	  If unsure, say Y.
0b0de1443   Robert P. J. Day   Kconfig: Extend "...
1018
  if MODULES
826e4506a   Linus Torvalds   Make forced modul...
1019
1020
  config MODULE_FORCE_LOAD
  	bool "Forced module loading"
826e4506a   Linus Torvalds   Make forced modul...
1021
1022
  	default n
  	help
91e37a793   Rusty Russell   module: don't ign...
1023
1024
1025
  	  Allow loading of modules without version information (ie. modprobe
  	  --force).  Forced module loading sets the 'F' (forced) taint flag and
  	  is usually a really bad idea.
826e4506a   Linus Torvalds   Make forced modul...
1026

1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
1027
1028
  config MODULE_UNLOAD
  	bool "Module unloading"
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
1029
1030
1031
  	help
  	  Without this option you will not be able to unload any
  	  modules (note that some modules may not be unloadable
f7f5b6755   Denys Vlasenko   Shrink struct mod...
1032
1033
  	  anyway), which makes your kernel smaller, faster
  	  and simpler.  If unsure, say Y.
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
  
  config MODULE_FORCE_UNLOAD
  	bool "Forced module unloading"
  	depends on MODULE_UNLOAD && EXPERIMENTAL
  	help
  	  This option allows you to force a module to unload, even if the
  	  kernel believes it is unsafe: the kernel will remove the module
  	  without waiting for anyone to stop using it (using the -f option to
  	  rmmod).  This is mainly for kernel developers and desperate users.
  	  If unsure, say N.
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
1044
  config MODVERSIONS
0d5416433   Sam Ravnborg   kbuild: remove EX...
1045
  	bool "Module versioning support"
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
  	help
  	  Usually, you have to use modules compiled with your kernel.
  	  Saying Y here makes it sometimes possible to use modules
  	  compiled for different kernels, by adding enough information
  	  to the modules to (hopefully) spot any changes which would
  	  make them incompatible with the kernel you are running.  If
  	  unsure, say N.
  
  config MODULE_SRCVERSION_ALL
  	bool "Source checksum for all modules"
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
1056
1057
1058
1059
1060
1061
1062
1063
  	help
  	  Modules which contain a MODULE_VERSION get an extra "srcversion"
  	  field inserted into their modinfo section, which contains a
      	  sum of the source files which made it.  This helps maintainers
  	  see exactly which source was used to build a module (since
  	  others sometimes change the module source without updating
  	  the version).  With this option, such a "srcversion" field
  	  will be created for all modules.  If unsure, say N.
0b0de1443   Robert P. J. Day   Kconfig: Extend "...
1064
  endif # MODULES
98a79d6a5   Rusty Russell   cpumask: centrali...
1065
1066
1067
1068
1069
1070
1071
  config INIT_ALL_POSSIBLE
  	bool
  	help
  	  Back when each arch used to define their own cpu_online_map and
  	  cpu_possible_map, some of them chose to initialize cpu_possible_map
  	  with all 1s, and others with all 0s.  When they were centralised,
  	  it was better to provide this option than to break all the archs
692105b8a   Matt LaPlante   trivial: fix typo...
1072
  	  and have several arch maintainers pursuing me down dark alleys.
98a79d6a5   Rusty Russell   cpumask: centrali...
1073

1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
1074
1075
1076
1077
1078
1079
  config STOP_MACHINE
  	bool
  	default y
  	depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU
  	help
  	  Need stop_machine() primitive.
3a65dfe8c   Jens Axboe   [BLOCK] Move all ...
1080

3a65dfe8c   Jens Axboe   [BLOCK] Move all ...
1081
  source "block/Kconfig"
e98c32029   Avi Kivity   Move PREEMPT_NOTI...
1082
1083
1084
  
  config PREEMPT_NOTIFIERS
  	bool
e260be673   Paul E. McKenney   Preempt-RCU: impl...
1085