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          drivers that have been replaced by something else, and/or are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

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 <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>.

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 <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
          at <http://www.physik3.uni-rostock.de/tim/kernel/utils/acct/>.

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 <subsystem>:<name>-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/<pid>/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 <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.

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