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config DEFCONFIG_LIST

        string

        depends on !UML

        option defconfig_list

        default "/lib/modules/$UNAME_RELEASE/.config"

        default "/etc/kernel-config"

        default "/boot/config-$UNAME_RELEASE"

        default "arch/$ARCH/defconfig"

menu "General setup"

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

          , , ,

          , and

           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          drivers that have been replaced by something else, and/or are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.

config BROKEN

        bool

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

        default 32 if !UML

        default 128 if UML

        help

          Maximum of each of the number of arguments and environment

          variables passed to init from the kernel command line.

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.

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

          release tree by looking for git tags that belong to the current

          top of tree revision.

          A string of the format -gxxxxxxxx will be added to the localversion

          if a git-based tree is found.  The string generated by this will be

          appended after any matching localversion* files, and after the value

          set in CONFIG_LOCALVERSION.

          (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".)

config SWAP

        bool "Support for paging of anonymous memory (swap)"

        depends on MMU && BLOCK

        default y

        help

          This option allows you to choose whether you want to have support

          for so called swap devices or swap files in your kernel that are

          used to provide more virtual memory than the actual RAM present

          in your computer.  If unsure say Y.

config SYSVIPC

        bool "System V IPC"

        ---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 ),

          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

          .

config SYSVIPC_SYSCTL

        bool

        depends on SYSVIPC

        depends on SYSCTL

        default y

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

          queues (functions mq_*) say Y here.

          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.

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 ).  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

          at .

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.

config TASK_DELAY_ACCT

        bool "Enable per-task delay accounting (EXPERIMENTAL)"

        depends on TASKSTATS

        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.

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.

config USER_NS

        bool "User Namespaces (EXPERIMENTAL)"

        default n

        depends on EXPERIMENTAL

        help

          Support user namespaces.  This allows containers, i.e.

          vservers, to use user namespaces to provide different

          user info for different servers.  If unsure, say N.

config PID_NS

        bool "PID Namespaces (EXPERIMENTAL)"

        default n

        depends on EXPERIMENTAL

        help

          Suport process id namespaces.  This allows having multiple

          process with the same pid as long as they are in different

          pid namespaces.  This is a building block of containers.

          Unless you want to work with an experimental feature

          say N here.

config AUDIT

        bool "Auditing support"

        depends on NET

        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"

        depends on AUDIT && (X86 || PPC || PPC64 || S390 || IA64 || UML || SPARC64)

        default y if SECURITY_SELINUX

        help

          Enable low-overhead system-call auditing infrastructure that

          can be used independently or with another kernel subsystem,

          such as SELinux.  To use audit's filesystem watch feature, please

          ensure that INOTIFY is configured.

config AUDIT_TREE

        def_bool y

        depends on AUDITSYSCALL && INOTIFY

config IKCONFIG

        tristate "Kernel .config support"

        ---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.

config LOG_BUF_SHIFT

        int "Kernel log buffer size (16 => 64KB, 17 => 128KB)"

        range 12 21

        default 17 if S390 || LOCKDEP

        default 16 if X86_NUMAQ || IA64

        default 15 if SMP

        default 14

        help

          Select kernel log buffer size as a power of 2.

          Defaults and Examples:

                     17 => 128 KB for S/390

                     16 => 64 KB for x86 NUMAQ or IA-64

                     15 => 32 KB for SMP

                     14 => 16 KB for uniprocessor

                     13 =>  8 KB

                     12 =>  4 KB

config CGROUPS

        bool "Control Group support"

        help

          This option will let you use process cgroup subsystems

          such as Cpusets

          Say N if unsure.

config CGROUP_DEBUG

        bool "Example debug cgroup subsystem"

        depends on CGROUPS

        help

          This option enables a simple cgroup subsystem that

          exports useful debugging information about the cgroups

          framework

          Say N if unsure

config CGROUP_NS

        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.

config CPUSETS

        bool "Cpuset support"

        depends on SMP && CGROUPS

        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.

config FAIR_GROUP_SCHED

        bool "Fair group CPU scheduler"

        default y

        help

          This feature lets CPU scheduler recognize task groups and control CPU

          bandwidth allocation to such task groups.

choice

        depends on FAIR_GROUP_SCHED

        prompt "Basis for grouping tasks"

        default FAIR_USER_SCHED

config FAIR_USER_SCHED

        bool "user id"

        help

          This option will choose userid as the basis for grouping

          tasks, thus providing equal CPU bandwidth to each user.

config FAIR_CGROUP_SCHED

        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.

          Refer to Documentation/cgroups.txt for more information

          on "cgroup" pseudo filesystem.

endchoice

config CGROUP_CPUACCT

        bool "Simple CPU accounting cgroup subsystem"

        depends on CGROUPS

        help

          Provides a simple Resource Controller for monitoring the

          total CPU consumed by the tasks in a cgroup

config SYSFS_DEPRECATED

        bool "Create deprecated sysfs files"

        default y

        help

          This option creates deprecated symlinks such as the

          "device"-link, the :-link, and the

          "bus"-link. It may also add deprecated key in the

          uevent environment.

          None of these features or values should be used today, as

          they export driver core implementation details to userspace

          or export properties which can't be kept stable across kernel

          releases.

          If enabled, this option will also move any device structures

          that belong to a class, back into the /sys/class hierarchy, in

          order to support older versions of udev.

          If you are using a distro that was released in 2006 or later,

          it should be safe to say N here.

config PROC_PID_CPUSET

        bool "Include legacy /proc//cpuset file"

        depends on CPUSETS

        default y

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.

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  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.

if BLK_DEV_INITRD

source "usr/Kconfig"

endif

config CC_OPTIMIZE_FOR_SIZE

        bool "Optimize for size (Look out for broken compilers!)"

        default y

        depends on ARM || H8300 || SUPERH || EXPERIMENTAL

        help

          Enabling this option will pass "-Os" instead of "-O2" to gcc

          resulting in a smaller kernel.

          WARNING: some versions of gcc may generate incorrect code with this

          option.  If problems are observed, a gcc upgrade may be needed.

          If unsure, say N.

config SYSCTL

        bool

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.

config UID16

        bool "Enable 16-bit UID system calls" if EMBEDDED

        depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && SPARC32_COMPAT) || UML || (X86_64 && IA32_EMULATION)

        default y

        help

          This enables the legacy 16-bit UID syscall wrappers.

config SYSCTL_SYSCALL

        bool "Sysctl syscall support" if EMBEDDED

        default y

        select SYSCTL

        ---help---

          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.

          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.

          If unsure say Y here.

config KALLSYMS

         bool "Load all symbols for debugging/ksymoops" if EMBEDDED

         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

           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.

           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.

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.

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.

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.

config ELF_CORE

        default y

        bool "Enable ELF core dumps" if EMBEDDED

        help

          Enable support for generating core dumps. Disabling saves about 4k.

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

        select RT_MUTEXES

        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 ANON_INODES

        bool

config EPOLL

        bool "Enable eventpoll support" if EMBEDDED

        default y

        select ANON_INODES

        help

          Disabling this option will cause the kernel to be built without

          support for epoll family of system calls.

config SIGNALFD

        bool "Enable signalfd() system call" if EMBEDDED

        select ANON_INODES

        default y

        help

          Enable the signalfd() system call that allows to receive signals

          on a file descriptor.

          If unsure, say Y.

config TIMERFD

        bool "Enable timerfd() system call" if EMBEDDED

        select ANON_INODES

        depends on BROKEN

        default y

        help

          Enable the timerfd() system call that allows to receive timer

          events on a file descriptor.

          If unsure, say Y.

config EVENTFD

        bool "Enable eventfd() system call" if EMBEDDED

        select ANON_INODES

        default y

        help

          Enable the eventfd() system call that allows to receive both

          kernel notification (ie. KAIO) or userspace notifications.

          If unsure, say Y.

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.

config VM_EVENT_COUNTERS

        default y

        bool "Enable VM event counters for /proc/vmstat" if EMBEDDED

        help

          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.

config SLUB_DEBUG

        default y

        bool "Enable SLUB debugging support" if EMBEDDED

        depends on SLUB

        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.

choice

        prompt "Choose SLAB allocator"

        default SLUB

        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

          well in all environments. It organizes cache hot objects in

          per cpu and per node queues. SLAB is the default choice for

          a slab allocator.

config SLUB

        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

           and has enhanced diagnostics.

config SLOB

        depends on EMBEDDED

        bool "SLOB (Simple Allocator)"

        help

           SLOB replaces the SLAB allocator with a drastically simpler

           allocator.  SLOB is more space efficient than SLAB but does not

           scale well (single lock for all operations) and is also highly

           susceptible to fragmentation. SLUB can accomplish a higher object

           density. It is usually better to use SLUB instead of SLOB.

endchoice

endmenu         # General setup

config SLABINFO

        bool

        depends on PROC_FS

        depends on SLAB || SLUB

        default y

config RT_MUTEXES

        boolean

        select PLIST

config TINY_SHMEM

        default !SHMEM

        bool

config BASE_SMALL

        int

        default 0 if BASE_FULL

        default 1 if !BASE_FULL

menuconfig MODULES

        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.

config MODULE_UNLOAD

        bool "Module unloading"

        depends on MODULES

        help

          Without this option you will not be able to unload any

          modules (note that some modules may not be unloadable

          anyway), which makes your kernel slightly smaller and

          simpler.  If unsure, say Y.

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.

config MODVERSIONS

        bool "Module versioning support"

        depends on MODULES

        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"

        depends on MODULES

        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.

config KMOD

        bool "Automatic kernel module loading"

        depends on MODULES

        help

          Normally when you have selected some parts of the kernel to

          be created as kernel modules, you must load them (using the

          "modprobe" command) before you can use them. If you say Y

          here, some parts of the kernel will be able to load modules

          automatically: when a part of the kernel needs a module, it

          runs modprobe with the appropriate arguments, thereby

          loading the module if it is available.  If unsure, say Y.

config STOP_MACHINE

        bool

        default y

        depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU

        help

          Need stop_machine() primitive.

source "block/Kconfig"

config PREEMPT_NOTIFIERS

        bool