config ARCH
  	string
  	option env="ARCH"
  
  config KERNELVERSION
  	string
  	option env="KERNELVERSION"

  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_DEFCONFIG"

  	default "arch/$ARCH/defconfig"

  config CONSTRUCTORS
  	bool
  	depends on !UML

  config IRQ_WORK
  	bool

  config BUILDTIME_EXTABLE_SORT
  	bool

  menu "General setup"

  config BROKEN
  	bool

  
  config BROKEN_ON_SMP
  	bool
  	depends on BROKEN || !SMP
  	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 CROSS_COMPILE
  	string "Cross-compiler tool prefix"
  	help
  	  Same as running 'make CROSS_COMPILE=prefix-' but stored for
  	  default make runs in this kernel build directory.  You don't
  	  need to set this unless you want the configured kernel build
  	  directory to select the cross-compiler automatically.

  config COMPILE_TEST
  	bool "Compile also drivers which will not load"

  	depends on !UML

  	default n
  	help
  	  Some drivers can be compiled on a different platform than they are
  	  intended to be run on. Despite they cannot be loaded there (or even
  	  when they load they cannot be used due to missing HW support),
  	  developers still, opposing to distributors, might want to build such
  	  drivers to compile-test them.
  
  	  If you are a developer and want to build everything available, say Y
  	  here. If you are a user/distributor, say N here to exclude useless
  	  drivers to be distributed.

  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

  	depends on !COMPILE_TEST

  	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 HAVE_KERNEL_GZIP
  	bool
  
  config HAVE_KERNEL_BZIP2
  	bool
  
  config HAVE_KERNEL_LZMA
  	bool

  config HAVE_KERNEL_XZ
  	bool

  config HAVE_KERNEL_LZO
  	bool

  config HAVE_KERNEL_LZ4
  	bool

  choice

  	prompt "Kernel compression mode"
  	default KERNEL_GZIP

  	depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4

  	help

  	  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

  	bool "Gzip"
  	depends on HAVE_KERNEL_GZIP
  	help

  	  The old and tried gzip compression. It provides a good balance
  	  between compression ratio and decompression speed.

  
  config KERNEL_BZIP2
  	bool "Bzip2"

  	depends on HAVE_KERNEL_BZIP2

  	help
  	  Its compression ratio and speed is intermediate.

  	  Decompression speed is slowest among the choices.  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.

  
  config KERNEL_LZMA

  	bool "LZMA"
  	depends on HAVE_KERNEL_LZMA
  	help

  	  This compression algorithm's ratio is best.  Decompression speed
  	  is between gzip and bzip2.  Compression is slowest.
  	  The kernel size is about 33% smaller with LZMA in comparison to gzip.

  config KERNEL_XZ
  	bool "XZ"
  	depends on HAVE_KERNEL_XZ
  	help
  	  XZ uses the LZMA2 algorithm and instruction set specific
  	  BCJ filters which can improve compression ratio of executable
  	  code. The size of the kernel is about 30% smaller with XZ in
  	  comparison to gzip. On architectures for which there is a BCJ
  	  filter (i386, x86_64, ARM, IA-64, PowerPC, and SPARC), XZ
  	  will create a few percent smaller kernel than plain LZMA.
  
  	  The speed is about the same as with LZMA: The decompression
  	  speed of XZ is better than that of bzip2 but worse than gzip
  	  and LZO. Compression is slow.

  config KERNEL_LZO
  	bool "LZO"
  	depends on HAVE_KERNEL_LZO
  	help

  	  Its compression ratio is the poorest among the choices. The kernel

  	  size is about 10% bigger than gzip; however its speed

  	  (both compression and decompression) is the fastest.

  config KERNEL_LZ4
  	bool "LZ4"
  	depends on HAVE_KERNEL_LZ4
  	help
  	  LZ4 is an LZ77-type compressor with a fixed, byte-oriented encoding.
  	  A preliminary version of LZ4 de/compression tool is available at
  	  <https://code.google.com/p/lz4/>.
  
  	  Its compression ratio is worse than LZO. The size of the kernel
  	  is about 8% bigger than LZO. But the decompression speed is
  	  faster than LZO.

  endchoice

  config DEFAULT_HOSTNAME
  	string "Default hostname"
  	default "(none)"
  	help
  	  This option determines the default system hostname before userspace
  	  calls sethostname(2). The kernel traditionally uses "(none)" here,
  	  but you may wish to use a different default here to make a minimal
  	  system more usable with less configuration.

  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

  	---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 POSIX_MQUEUE_SYSCTL
  	bool
  	depends on POSIX_MQUEUE
  	depends on SYSCTL
  	default y

  config CROSS_MEMORY_ATTACH
  	bool "Enable process_vm_readv/writev syscalls"
  	depends on MMU
  	default y
  	help
  	  Enabling this option adds the system calls process_vm_readv and
  	  process_vm_writev which allow a process with the correct privileges

  	  to directly read from or write to another process' address space.

  	  See the man page for more details.

  config FHANDLE

  	bool "open by fhandle syscalls" if EXPERT

  	select EXPORTFS

  	default y

  	help
  	  If you say Y here, a user level program will be able to map
  	  file names to handle and then later use the handle for
  	  different file system operations. This is useful in implementing
  	  userspace file servers, which now track files using handles instead
  	  of names. The handle would remain the same even if file names
  	  get renamed. Enables open_by_handle_at(2) and name_to_handle_at(2)
  	  syscalls.

  config USELIB
  	bool "uselib syscall"

  	def_bool ALPHA || M68K || SPARC || X86_32 || IA32_EMULATION

  	help
  	  This option enables the uselib syscall, a system call used in the
  	  dynamic linker from libc5 and earlier.  glibc does not use this
  	  system call.  If you intend to run programs built on libc5 or
  	  earlier, you may need to enable this syscall.  Current systems
  	  running glibc can safely disable this.

  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).  System call auditing is included
  	  on architectures which support it.

  config HAVE_ARCH_AUDITSYSCALL
  	bool

  config AUDITSYSCALL

  	def_bool y

  	depends on AUDIT && HAVE_ARCH_AUDITSYSCALL

  
  config AUDIT_WATCH
  	def_bool y
  	depends on AUDITSYSCALL
  	select FSNOTIFY
  
  config AUDIT_TREE
  	def_bool y
  	depends on AUDITSYSCALL
  	select FSNOTIFY

  source "kernel/irq/Kconfig"
  source "kernel/time/Kconfig"
  
  menu "CPU/Task time and stats accounting"

  config VIRT_CPU_ACCOUNTING
  	bool

  choice
  	prompt "Cputime accounting"
  	default TICK_CPU_ACCOUNTING if !PPC64

  	default VIRT_CPU_ACCOUNTING_NATIVE if PPC64

  
  # Kind of a stub config for the pure tick based cputime accounting
  config TICK_CPU_ACCOUNTING
  	bool "Simple tick based cputime accounting"

  	depends on !S390 && !NO_HZ_FULL

  	help
  	  This is the basic tick based cputime accounting that maintains
  	  statistics about user, system and idle time spent on per jiffies
  	  granularity.
  
  	  If unsure, say Y.

  config VIRT_CPU_ACCOUNTING_NATIVE

  	bool "Deterministic task and CPU time accounting"

  	depends on HAVE_VIRT_CPU_ACCOUNTING && !NO_HZ_FULL

  	select VIRT_CPU_ACCOUNTING

  	help
  	  Select this option to enable more accurate task and CPU time
  	  accounting.  This is done by reading a CPU counter on each
  	  kernel entry and exit and on transitions within the kernel
  	  between system, softirq and hardirq state, so there is a
  	  small performance impact.  In the case of s390 or IBM POWER > 5,
  	  this also enables accounting of stolen time on logically-partitioned
  	  systems.

  config VIRT_CPU_ACCOUNTING_GEN
  	bool "Full dynticks CPU time accounting"

  	depends on HAVE_CONTEXT_TRACKING

  	depends on HAVE_VIRT_CPU_ACCOUNTING_GEN

  	select VIRT_CPU_ACCOUNTING
  	select CONTEXT_TRACKING
  	help
  	  Select this option to enable task and CPU time accounting on full
  	  dynticks systems. This accounting is implemented by watching every
  	  kernel-user boundaries using the context tracking subsystem.
  	  The accounting is thus performed at the expense of some significant
  	  overhead.
  
  	  For now this is only useful if you are working on the full
  	  dynticks subsystem development.
  
  	  If unsure, say N.

  endchoice

  config IRQ_TIME_ACCOUNTING
  	bool "Fine granularity task level IRQ time accounting"

  	depends on HAVE_IRQ_TIME_ACCOUNTING && !VIRT_CPU_ACCOUNTING_NATIVE

  	help
  	  Select this option to enable fine granularity task irq time
  	  accounting. This is done by reading a timestamp on each
  	  transitions between softirq and hardirq state, so there can be a
  	  small performance impact.
  
  	  If in doubt, say N here.

  config BSD_PROCESS_ACCT
  	bool "BSD Process Accounting"

  	depends on MULTIUSER

  	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.gnu.org/software/acct/>.

  config TASKSTATS

  	bool "Export task/process statistics through netlink"

  	depends on NET

  	depends on MULTIUSER

  	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"

  	depends on TASKSTATS

  	select SCHED_INFO

  	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"

  	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"

  	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.

  endmenu # "CPU/Task time and stats accounting"

  menu "RCU Subsystem"

  config TREE_RCU

  	bool
  	default y if !PREEMPT && SMP

  	help
  	  This option selects the RCU implementation that is
  	  designed for very large SMP system with hundreds or

  	  thousands of CPUs.  It also scales down nicely to
  	  smaller systems.

  config PREEMPT_RCU

  	bool
  	default y if PREEMPT

  	help
  	  This option selects the RCU implementation that is
  	  designed for very large SMP systems with hundreds or
  	  thousands of CPUs, but for which real-time response

  	  is also required.  It also scales down nicely to
  	  smaller systems.

  	  Select this option if you are unsure.

  config TINY_RCU

  	bool
  	default y if !PREEMPT && !SMP

  	help
  	  This option selects the RCU implementation that is
  	  designed for UP systems from which real-time response
  	  is not required.  This option greatly reduces the
  	  memory footprint of RCU.

  config RCU_EXPERT
  	bool "Make expert-level adjustments to RCU configuration"
  	default n
  	help
  	  This option needs to be enabled if you wish to make
  	  expert-level adjustments to RCU configuration.  By default,
  	  no such adjustments can be made, which has the often-beneficial
  	  side-effect of preventing "make oldconfig" from asking you all
  	  sorts of detailed questions about how you would like numerous
  	  obscure RCU options to be set up.
  
  	  Say Y if you need to make expert-level adjustments to RCU.
  
  	  Say N if you are unsure.

  config SRCU
  	bool
  	help
  	  This option selects the sleepable version of RCU. This version
  	  permits arbitrary sleeping or blocking within RCU read-side critical
  	  sections.

  config TASKS_RCU

  	bool

  	default n

  	depends on !UML

  	select SRCU

  	help
  	  This option enables a task-based RCU implementation that uses
  	  only voluntary context switch (not preemption!), idle, and
  	  user-mode execution as quiescent states.

  config RCU_STALL_COMMON

  	def_bool ( TREE_RCU || PREEMPT_RCU || RCU_TRACE )

  	help
  	  This option enables RCU CPU stall code that is common between
  	  the TINY and TREE variants of RCU.  The purpose is to allow
  	  the tiny variants to disable RCU CPU stall warnings, while
  	  making these warnings mandatory for the tree variants.

  config CONTEXT_TRACKING
         bool

  config CONTEXT_TRACKING_FORCE
  	bool "Force context tracking"
  	depends on CONTEXT_TRACKING

  	default y if !NO_HZ_FULL

  	help

  	  The major pre-requirement for full dynticks to work is to
  	  support the context tracking subsystem. But there are also
  	  other dependencies to provide in order to make the full
  	  dynticks working.
  
  	  This option stands for testing when an arch implements the
  	  context tracking backend but doesn't yet fullfill all the
  	  requirements to make the full dynticks feature working.
  	  Without the full dynticks, there is no way to test the support
  	  for context tracking and the subsystems that rely on it: RCU
  	  userspace extended quiescent state and tickless cputime
  	  accounting. This option copes with the absence of the full
  	  dynticks subsystem by forcing the context tracking on all
  	  CPUs in the system.

  	  Say Y only if you're working on the development of an

  	  architecture backend for the context tracking.
  
  	  Say N otherwise, this option brings an overhead that you
  	  don't want in production.

  config RCU_FANOUT
  	int "Tree-based hierarchical RCU fanout value"
  	range 2 64 if 64BIT
  	range 2 32 if !64BIT

  	depends on (TREE_RCU || PREEMPT_RCU) && RCU_EXPERT

  	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 fourth
  	  root of NR_CPUS, which allows NR_CPUS to be insanely large.
  	  The default value of RCU_FANOUT should be used for production
  	  systems, but if you are stress-testing the RCU implementation
  	  itself, small RCU_FANOUT values allow you to test large-system
  	  code paths on small(er) systems.

  
  	  Select a specific number if testing RCU itself.
  	  Take the default if unsure.

  config RCU_FANOUT_LEAF
  	int "Tree-based hierarchical RCU leaf-level fanout value"

  	range 2 64 if 64BIT
  	range 2 32 if !64BIT

  	depends on (TREE_RCU || PREEMPT_RCU) && RCU_EXPERT

  	default 16
  	help
  	  This option controls the leaf-level fanout of hierarchical
  	  implementations of RCU, and allows trading off cache misses
  	  against lock contention.  Systems that synchronize their
  	  scheduling-clock interrupts for energy-efficiency reasons will
  	  want the default because the smaller leaf-level fanout keeps
  	  lock contention levels acceptably low.  Very large systems
  	  (hundreds or thousands of CPUs) will instead want to set this
  	  value to the maximum value possible in order to reduce the
  	  number of cache misses incurred during RCU's grace-period
  	  initialization.  These systems tend to run CPU-bound, and thus
  	  are not helped by synchronized interrupts, and thus tend to
  	  skew them, which reduces lock contention enough that large
  	  leaf-level fanouts work well.
  
  	  Select a specific number if testing RCU itself.
  
  	  Select the maximum permissible value for large systems.
  
  	  Take the default if unsure.

  config RCU_FAST_NO_HZ
  	bool "Accelerate last non-dyntick-idle CPU's grace periods"

  	depends on NO_HZ_COMMON && SMP && RCU_EXPERT

  	default n
  	help

  	  This option permits CPUs to enter dynticks-idle state even if
  	  they have RCU callbacks queued, and prevents RCU from waking
  	  these CPUs up more than roughly once every four jiffies (by
  	  default, you can adjust this using the rcutree.rcu_idle_gp_delay
  	  parameter), thus improving energy efficiency.  On the other
  	  hand, this option increases the duration of RCU grace periods,
  	  for example, slowing down synchronize_rcu().

  	  Say Y if energy efficiency is critically important, and you
  	  	don't care about increased grace-period durations.

  
  	  Say N if you are unsure.

  config TREE_RCU_TRACE

  	def_bool RCU_TRACE && ( TREE_RCU || PREEMPT_RCU )

  	select DEBUG_FS
  	help

  	  This option provides tracing for the TREE_RCU and

  	  PREEMPT_RCU implementations, permitting Makefile to

  	  trivially select kernel/rcutree_trace.c.

  config RCU_BOOST
  	bool "Enable RCU priority boosting"

  	depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT

  	default n
  	help
  	  This option boosts the priority of preempted RCU readers that
  	  block the current preemptible RCU grace period for too long.
  	  This option also prevents heavy loads from blocking RCU
  	  callback invocation for all flavors of RCU.
  
  	  Say Y here if you are working with real-time apps or heavy loads
  	  Say N here if you are unsure.

  config RCU_KTHREAD_PRIO
  	int "Real-time priority to use for RCU worker threads"

  	range 1 99 if RCU_BOOST
  	range 0 99 if !RCU_BOOST
  	default 1 if RCU_BOOST
  	default 0 if !RCU_BOOST

  	depends on RCU_EXPERT

  	help

  	  This option specifies the SCHED_FIFO priority value that will be
  	  assigned to the rcuc/n and rcub/n threads and is also the value
  	  used for RCU_BOOST (if enabled). If you are working with a
  	  real-time application that has one or more CPU-bound threads
  	  running at a real-time priority level, you should set
  	  RCU_KTHREAD_PRIO to a priority higher than the highest-priority
  	  real-time CPU-bound application thread.  The default RCU_KTHREAD_PRIO
  	  value of 1 is appropriate in the common case, which is real-time

  	  applications that do not have any CPU-bound threads.
  
  	  Some real-time applications might not have a single real-time
  	  thread that saturates a given CPU, but instead might have
  	  multiple real-time threads that, taken together, fully utilize

  	  that CPU.  In this case, you should set RCU_KTHREAD_PRIO to

  	  a priority higher than the lowest-priority thread that is
  	  conspiring to prevent the CPU from running any non-real-time
  	  tasks.  For example, if one thread at priority 10 and another
  	  thread at priority 5 are between themselves fully consuming

  	  the CPU time on a given CPU, then RCU_KTHREAD_PRIO should be

  	  set to priority 6 or higher.

  
  	  Specify the real-time priority, or take the default if unsure.
  
  config RCU_BOOST_DELAY
  	int "Milliseconds to delay boosting after RCU grace-period start"
  	range 0 3000
  	depends on RCU_BOOST
  	default 500
  	help
  	  This option specifies the time to wait after the beginning of
  	  a given grace period before priority-boosting preempted RCU
  	  readers blocking that grace period.  Note that any RCU reader
  	  blocking an expedited RCU grace period is boosted immediately.
  
  	  Accept the default if unsure.

  config RCU_NOCB_CPU

  	bool "Offload RCU callback processing from boot-selected CPUs"

  	depends on TREE_RCU || PREEMPT_RCU

  	depends on RCU_EXPERT || NO_HZ_FULL

  	default n
  	help
  	  Use this option to reduce OS jitter for aggressive HPC or
  	  real-time workloads.	It can also be used to offload RCU
  	  callback invocation to energy-efficient CPUs in battery-powered
  	  asymmetric multiprocessors.
  
  	  This option offloads callback invocation from the set of
  	  CPUs specified at boot time by the rcu_nocbs parameter.

  	  For each such CPU, a kthread ("rcuox/N") will be created to
  	  invoke callbacks, where the "N" is the CPU being offloaded,
  	  and where the "x" is "b" for RCU-bh, "p" for RCU-preempt, and
  	  "s" for RCU-sched.  Nothing prevents this kthread from running
  	  on the specified CPUs, but (1) the kthreads may be preempted
  	  between each callback, and (2) affinity or cgroups can be used
  	  to force the kthreads to run on whatever set of CPUs is desired.

  	  Say Y here if you want to help to debug reduced OS jitter.

  	  Say N here if you are unsure.

  choice
  	prompt "Build-forced no-CBs CPUs"
  	default RCU_NOCB_CPU_NONE

  	depends on RCU_NOCB_CPU

  	help

  	  This option allows no-CBs CPUs (whose RCU callbacks are invoked
  	  from kthreads rather than from softirq context) to be specified
  	  at build time.  Additional no-CBs CPUs may be specified by
  	  the rcu_nocbs= boot parameter.

  
  config RCU_NOCB_CPU_NONE
  	bool "No build_forced no-CBs CPUs"

  	help
  	  This option does not force any of the CPUs to be no-CBs CPUs.
  	  Only CPUs designated by the rcu_nocbs= boot parameter will be

  	  no-CBs CPUs, whose RCU callbacks will be invoked by per-CPU
  	  kthreads whose names begin with "rcuo".  All other CPUs will
  	  invoke their own RCU callbacks in softirq context.
  
  	  Select this option if you want to choose no-CBs CPUs at
  	  boot time, for example, to allow testing of different no-CBs
  	  configurations without having to rebuild the kernel each time.

  
  config RCU_NOCB_CPU_ZERO
  	bool "CPU 0 is a build_forced no-CBs CPU"

  	help

  	  This option forces CPU 0 to be a no-CBs CPU, so that its RCU
  	  callbacks are invoked by a per-CPU kthread whose name begins
  	  with "rcuo".	Additional CPUs may be designated as no-CBs
  	  CPUs using the rcu_nocbs= boot parameter will be no-CBs CPUs.
  	  All other CPUs will invoke their own RCU callbacks in softirq
  	  context.

  
  	  Select this if CPU 0 needs to be a no-CBs CPU for real-time

  	  or energy-efficiency reasons, but the real reason it exists
  	  is to ensure that randconfig testing covers mixed systems.

  
  config RCU_NOCB_CPU_ALL
  	bool "All CPUs are build_forced no-CBs CPUs"

  	help
  	  This option forces all CPUs to be no-CBs CPUs.  The rcu_nocbs=

  	  boot parameter will be ignored.  All CPUs' RCU callbacks will
  	  be executed in the context of per-CPU rcuo kthreads created for
  	  this purpose.  Assuming that the kthreads whose names start with
  	  "rcuo" are bound to "housekeeping" CPUs, this reduces OS jitter
  	  on the remaining CPUs, but might decrease memory locality during
  	  RCU-callback invocation, thus potentially degrading throughput.

  
  	  Select this if all CPUs need to be no-CBs CPUs for real-time
  	  or energy-efficiency reasons.
  
  endchoice

  config RCU_EXPEDITE_BOOT
  	bool
  	default n
  	help
  	  This option enables expedited grace periods at boot time,
  	  as if rcu_expedite_gp() had been invoked early in boot.
  	  The corresponding rcu_unexpedite_gp() is invoked from
  	  rcu_end_inkernel_boot(), which is intended to be invoked
  	  at the end of the kernel-only boot sequence, just before
  	  init is exec'ed.
  
  	  Accept the default if unsure.

  endmenu # "RCU Subsystem"

  config BUILD_BIN2C
  	bool
  	default n

  config IKCONFIG

  	tristate "Kernel .config support"

  	select BUILD_BIN2C

  	---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 25

  	default 17

  	depends on PRINTK

  	help

  	  Select the minimal kernel log buffer size as a power of 2.
  	  The final size is affected by LOG_CPU_MAX_BUF_SHIFT config
  	  parameter, see below. Any higher size also might be forced
  	  by "log_buf_len" boot parameter.

  	  Examples:

  		     17 => 128 KB

  		     16 => 64 KB

  		     15 => 32 KB
  		     14 => 16 KB

  		     13 =>  8 KB
  		     12 =>  4 KB

  config LOG_CPU_MAX_BUF_SHIFT
  	int "CPU kernel log buffer size contribution (13 => 8 KB, 17 => 128KB)"

  	depends on SMP

  	range 0 21
  	default 12 if !BASE_SMALL
  	default 0 if BASE_SMALL

  	depends on PRINTK

  	help
  	  This option allows to increase the default ring buffer size
  	  according to the number of CPUs. The value defines the contribution
  	  of each CPU as a power of 2. The used space is typically only few
  	  lines however it might be much more when problems are reported,
  	  e.g. backtraces.
  
  	  The increased size means that a new buffer has to be allocated and
  	  the original static one is unused. It makes sense only on systems
  	  with more CPUs. Therefore this value is used only when the sum of
  	  contributions is greater than the half of the default kernel ring
  	  buffer as defined by LOG_BUF_SHIFT. The default values are set
  	  so that more than 64 CPUs are needed to trigger the allocation.
  
  	  Also this option is ignored when "log_buf_len" kernel parameter is
  	  used as it forces an exact (power of two) size of the ring buffer.
  
  	  The number of possible CPUs is used for this computation ignoring

  	  hotplugging making the computation optimal for the worst case
  	  scenario while allowing a simple algorithm to be used from bootup.

  
  	  Examples shift values and their meaning:
  		     17 => 128 KB for each CPU
  		     16 =>  64 KB for each CPU
  		     15 =>  32 KB for each CPU
  		     14 =>  16 KB for each CPU
  		     13 =>   8 KB for each CPU
  		     12 =>   4 KB for each CPU

  config NMI_LOG_BUF_SHIFT
  	int "Temporary per-CPU NMI log buffer size (12 => 4KB, 13 => 8KB)"
  	range 10 21
  	default 13
  	depends on PRINTK_NMI
  	help
  	  Select the size of a per-CPU buffer where NMI messages are temporary
  	  stored. They are copied to the main log buffer in a safe context
  	  to avoid a deadlock. The value defines the size as a power of 2.
  
  	  NMI messages are rare and limited. The largest one is when
  	  a backtrace is printed. It usually fits into 4KB. Select
  	  8KB if you want to be on the safe side.
  
  	  Examples:
  		     17 => 128 KB for each CPU
  		     16 =>  64 KB for each CPU
  		     15 =>  32 KB for each CPU
  		     14 =>  16 KB for each CPU
  		     13 =>   8 KB for each CPU
  		     12 =>   4 KB for each CPU

  #
  # Architectures with an unreliable sched_clock() should select this:
  #
  config HAVE_UNSTABLE_SCHED_CLOCK
  	bool

  config GENERIC_SCHED_CLOCK
  	bool

  #
  # For architectures that want to enable the support for NUMA-affine scheduler
  # balancing logic:
  #
  config ARCH_SUPPORTS_NUMA_BALANCING
  	bool

  #

  # For architectures that prefer to flush all TLBs after a number of pages
  # are unmapped instead of sending one IPI per page to flush. The architecture
  # must provide guarantees on what happens if a clean TLB cache entry is
  # written after the unmap. Details are in mm/rmap.c near the check for
  # should_defer_flush. The architecture should also consider if the full flush
  # and the refill costs are offset by the savings of sending fewer IPIs.
  config ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
  	bool
  
  #

  # For architectures that know their GCC __int128 support is sound
  #
  config ARCH_SUPPORTS_INT128
  	bool

  # For architectures that (ab)use NUMA to represent different memory regions
  # all cpu-local but of different latencies, such as SuperH.
  #
  config ARCH_WANT_NUMA_VARIABLE_LOCALITY
  	bool

  config NUMA_BALANCING
  	bool "Memory placement aware NUMA scheduler"

  	depends on ARCH_SUPPORTS_NUMA_BALANCING
  	depends on !ARCH_WANT_NUMA_VARIABLE_LOCALITY
  	depends on SMP && NUMA && MIGRATION
  	help
  	  This option adds support for automatic NUMA aware memory/task placement.
  	  The mechanism is quite primitive and is based on migrating memory when

  	  it has references to the node the task is running on.

  
  	  This system will be inactive on UMA systems.

  config NUMA_BALANCING_DEFAULT_ENABLED
  	bool "Automatically enable NUMA aware memory/task placement"
  	default y
  	depends on NUMA_BALANCING
  	help
  	  If set, automatic NUMA balancing will be enabled if running on a NUMA
  	  machine.

  menuconfig CGROUPS

  	bool "Control Group support"

  	select KERNFS

  	help

  	  This option adds support for grouping sets of processes together, for

  	  use with process control subsystems such as Cpusets, CFS, memory
  	  controls or device isolation.
  	  See

  		- Documentation/scheduler/sched-design-CFS.txt	(CFS)

  		- Documentation/cgroup-v1/ (features for grouping, isolation

  					  and resource control)

  
  	  Say N if unsure.

  if CGROUPS

  config PAGE_COUNTER
         bool

  config MEMCG

  	bool "Memory controller"

  	select PAGE_COUNTER

  	select EVENTFD

  	help

  	  Provides control over the memory footprint of tasks in a cgroup.

  config MEMCG_SWAP

  	bool "Swap controller"

  	depends on MEMCG && SWAP

  	help

  	  Provides control over the swap space consumed by tasks in a cgroup.

  config MEMCG_SWAP_ENABLED

  	bool "Swap controller enabled by default"

  	depends on MEMCG_SWAP

  	default y
  	help
  	  Memory Resource Controller Swap Extension comes with its price in
  	  a bigger memory consumption. General purpose distribution kernels

  	  which want to enable the feature but keep it disabled by default

  	  and let the user enable it by swapaccount=1 boot command line

  	  parameter should have this option unselected.
  	  For those who want to have the feature enabled by default should
  	  select this option (if, for some reason, they need to disable it

  	  then swapaccount=0 does the trick).

  config BLK_CGROUP
  	bool "IO controller"
  	depends on BLOCK

  	default n

  	---help---
  	Generic block IO controller cgroup interface. This is the common
  	cgroup interface which should be used by various IO controlling
  	policies.

  	Currently, CFQ IO scheduler uses it to recognize task groups and
  	control disk bandwidth allocation (proportional time slice allocation)
  	to such task groups. It is also used by bio throttling logic in
  	block layer to implement upper limit in IO rates on a device.

  	This option only enables generic Block IO controller infrastructure.
  	One needs to also enable actual IO controlling logic/policy. For
  	enabling proportional weight division of disk bandwidth in CFQ, set
  	CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
  	CONFIG_BLK_DEV_THROTTLING=y.

  	See Documentation/cgroup-v1/blkio-controller.txt for more information.

  
  config DEBUG_BLK_CGROUP
  	bool "IO controller debugging"
  	depends on BLK_CGROUP
  	default n
  	---help---
  	Enable some debugging help. Currently it exports additional stat
  	files in a cgroup which can be useful for debugging.
  
  config CGROUP_WRITEBACK
  	bool
  	depends on MEMCG && BLK_CGROUP
  	default y

  menuconfig CGROUP_SCHED

  	bool "CPU controller"

  	default n
  	help
  	  This feature lets CPU scheduler recognize task groups and control CPU
  	  bandwidth allocation to such task groups. It uses cgroups to group
  	  tasks.
  
  if CGROUP_SCHED
  config FAIR_GROUP_SCHED
  	bool "Group scheduling for SCHED_OTHER"
  	depends on CGROUP_SCHED
  	default CGROUP_SCHED

  config CFS_BANDWIDTH
  	bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED"

  	depends on FAIR_GROUP_SCHED
  	default n
  	help
  	  This option allows users to define CPU bandwidth rates (limits) for
  	  tasks running within the fair group scheduler.  Groups with no limit
  	  set are considered to be unconstrained and will run with no
  	  restriction.
  	  See tip/Documentation/scheduler/sched-bwc.txt for more information.

  config RT_GROUP_SCHED
  	bool "Group scheduling for SCHED_RR/FIFO"

  	depends on CGROUP_SCHED
  	default n
  	help
  	  This feature lets you explicitly allocate real CPU bandwidth

  	  to task groups. If enabled, it will also make it impossible to

  	  schedule realtime tasks for non-root users until you allocate
  	  realtime bandwidth for them.
  	  See Documentation/scheduler/sched-rt-group.txt for more information.
  
  endif #CGROUP_SCHED

  config CGROUP_PIDS
  	bool "PIDs controller"
  	help
  	  Provides enforcement of process number limits in the scope of a
  	  cgroup. Any attempt to fork more processes than is allowed in the
  	  cgroup will fail. PIDs are fundamentally a global resource because it
  	  is fairly trivial to reach PID exhaustion before you reach even a
  	  conservative kmemcg limit. As a result, it is possible to grind a
  	  system to halt without being limited by other cgroup policies. The

  	  PIDs controller is designed to stop this from happening.

  
  	  It should be noted that organisational operations (such as attaching

  	  to a cgroup hierarchy will *not* be blocked by the PIDs controller),

  	  since the PIDs limit only affects a process's ability to fork, not to
  	  attach to a cgroup.
  
  config CGROUP_FREEZER
  	bool "Freezer controller"
  	help
  	  Provides a way to freeze and unfreeze all tasks in a
  	  cgroup.

  	  This option affects the ORIGINAL cgroup interface. The cgroup2 memory
  	  controller includes important in-kernel memory consumers per default.
  
  	  If you're using cgroup2, say N.

  config CGROUP_HUGETLB
  	bool "HugeTLB controller"
  	depends on HUGETLB_PAGE
  	select PAGE_COUNTER

  	default n

  	help
  	  Provides a cgroup controller for HugeTLB pages.
  	  When you enable this, you can put a per cgroup limit on HugeTLB usage.
  	  The limit is enforced during page fault. Since HugeTLB doesn't
  	  support page reclaim, enforcing the limit at page fault time implies
  	  that, the application will get SIGBUS signal if it tries to access
  	  HugeTLB pages beyond its limit. This requires the application to know
  	  beforehand how much HugeTLB pages it would require for its use. The
  	  control group is tracked in the third page lru pointer. This means
  	  that we cannot use the controller with huge page less than 3 pages.

  config CPUSETS
  	bool "Cpuset controller"
  	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 PROC_PID_CPUSET
  	bool "Include legacy /proc/<pid>/cpuset file"
  	depends on CPUSETS
  	default y

  config CGROUP_DEVICE
  	bool "Device controller"
  	help
  	  Provides a cgroup controller implementing whitelists for
  	  devices which a process in the cgroup can mknod or open.
  
  config CGROUP_CPUACCT
  	bool "Simple CPU accounting controller"
  	help
  	  Provides a simple controller for monitoring the
  	  total CPU consumed by the tasks in a cgroup.
  
  config CGROUP_PERF
  	bool "Perf controller"
  	depends on PERF_EVENTS
  	help
  	  This option extends the perf per-cpu mode to restrict monitoring
  	  to threads which belong to the cgroup specified and run on the
  	  designated cpu.
  
  	  Say N if unsure.
  
  config CGROUP_DEBUG
  	bool "Example controller"

  	default n

  	help
  	  This option enables a simple controller that exports
  	  debugging information about the cgroups framework.

  	  Say N.

  endif # CGROUPS

  config CHECKPOINT_RESTORE
  	bool "Checkpoint/restore support" if EXPERT

  	select PROC_CHILDREN

  	default n
  	help
  	  Enables additional kernel features in a sake of checkpoint/restore.
  	  In particular it adds auxiliary prctl codes to setup process text,
  	  data and heap segment sizes, and a few additional /proc filesystem
  	  entries.
  
  	  If unsure, say N here.

  menuconfig NAMESPACES

  	bool "Namespaces support" if EXPERT

  	depends on MULTIUSER

  	default !EXPERT

  	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.

  if NAMESPACES

  config UTS_NS
  	bool "UTS namespace"

  	default y

  	help
  	  In this namespace tasks see different info provided with the
  	  uname() system call

  config IPC_NS
  	bool "IPC namespace"

  	depends on (SYSVIPC || POSIX_MQUEUE)

  	default y

  	help
  	  In this namespace tasks work with IPC ids which correspond to

  	  different IPC objects in different namespaces.

  config USER_NS

  	bool "User namespace"

  	default n

  	help
  	  This allows containers, i.e. vservers, to use user namespaces
  	  to provide different user info for different servers.

  
  	  When user namespaces are enabled in the kernel it is

  	  recommended that the MEMCG option also be enabled and that
  	  user-space use the memory control groups to limit the amount
  	  of memory a memory unprivileged users can use.

  	  If unsure, say N.

  config PID_NS

  	bool "PID Namespaces"

  	default y

  	help

  	  Support process id namespaces.  This allows having multiple

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

  	  pid namespaces.  This is a building block of containers.

  config NET_NS
  	bool "Network namespace"

  	depends on NET

  	default y

  	help
  	  Allow user space to create what appear to be multiple instances
  	  of the network stack.

  endif # NAMESPACES

  config SCHED_AUTOGROUP
  	bool "Automatic process group scheduling"

  	select CGROUPS
  	select CGROUP_SCHED
  	select FAIR_GROUP_SCHED
  	help
  	  This option optimizes the scheduler for common desktop workloads by
  	  automatically creating and populating task groups.  This separation
  	  of workloads isolates aggressive CPU burners (like build jobs) from
  	  desktop applications.  Task group autogeneration is currently based
  	  upon task session.

  config SYSFS_DEPRECATED

  	bool "Enable deprecated sysfs features to support old userspace tools"

  	depends on SYSFS
  	default n
  	help
  	  This option adds code that switches the layout of the "block" class
  	  devices, to not show up in /sys/class/block/, but only in
  	  /sys/block/.
  
  	  This switch is only active when the sysfs.deprecated=1 boot option is
  	  passed or the SYSFS_DEPRECATED_V2 option is set.
  
  	  This option allows new kernels to run on old distributions and tools,
  	  which might get confused by /sys/class/block/. Since 2007/2008 all
  	  major distributions and tools handle this just fine.
  
  	  Recent distributions and userspace tools after 2009/2010 depend on
  	  the existence of /sys/class/block/, and will not work with this
  	  option enabled.
  
  	  Only if you are using a new kernel on an old distribution, you might
  	  need to say Y here.
  
  config SYSFS_DEPRECATED_V2

  	bool "Enable deprecated sysfs features by default"

  	default n
  	depends on SYSFS
  	depends on SYSFS_DEPRECATED
  	help
  	  Enable deprecated sysfs by default.
  
  	  See the CONFIG_SYSFS_DEPRECATED option for more details about this
  	  option.
  
  	  Only if you are using a new kernel on an old distribution, you might
  	  need to say Y here. Even then, odds are you would not need it
  	  enabled, you can always pass the boot option if absolutely necessary.
  
  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

  choice
  	prompt "Compiler optimization level"
  	default CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
  
  config CC_OPTIMIZE_FOR_PERFORMANCE
  	bool "Optimize for performance"
  	help
  	  This is the default optimization level for the kernel, building
  	  with the "-O2" compiler flag for best performance and most
  	  helpful compile-time warnings.

  config CC_OPTIMIZE_FOR_SIZE

  	bool "Optimize for size"

  	help

  	  Enabling this option will pass "-Os" instead of "-O2" to
  	  your compiler resulting in a smaller kernel.

  	  If unsure, say N.

  endchoice

  config SYSCTL
  	bool

  config ANON_INODES
  	bool

  config HAVE_UID16
  	bool
  
  config SYSCTL_EXCEPTION_TRACE
  	bool
  	help
  	  Enable support for /proc/sys/debug/exception-trace.
  
  config SYSCTL_ARCH_UNALIGN_NO_WARN
  	bool
  	help
  	  Enable support for /proc/sys/kernel/ignore-unaligned-usertrap
  	  Allows arch to define/use @no_unaligned_warning to possibly warn
  	  about unaligned access emulation going on under the hood.
  
  config SYSCTL_ARCH_UNALIGN_ALLOW
  	bool
  	help
  	  Enable support for /proc/sys/kernel/unaligned-trap
  	  Allows arches to define/use @unaligned_enabled to runtime toggle
  	  the unaligned access emulation.
  	  see arch/parisc/kernel/unaligned.c for reference

  config HAVE_PCSPKR_PLATFORM
  	bool

  # interpreter that classic socket filters depend on
  config BPF
  	bool

  menuconfig EXPERT
  	bool "Configure standard kernel features (expert users)"

  	# Unhide debug options, to make the on-by-default options visible
  	select DEBUG_KERNEL

  	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 EXPERT

  	depends on HAVE_UID16 && MULTIUSER

  	default y
  	help
  	  This enables the legacy 16-bit UID syscall wrappers.

  config MULTIUSER
  	bool "Multiple users, groups and capabilities support" if EXPERT
  	default y
  	help
  	  This option enables support for non-root users, groups and
  	  capabilities.
  
  	  If you say N here, all processes will run with UID 0, GID 0, and all
  	  possible capabilities.  Saying N here also compiles out support for
  	  system calls related to UIDs, GIDs, and capabilities, such as setuid,
  	  setgid, and capset.
  
  	  If unsure, say Y here.

  config SGETMASK_SYSCALL
  	bool "sgetmask/ssetmask syscalls support" if EXPERT
  	def_bool PARISC || MN10300 || BLACKFIN || M68K || PPC || MIPS || X86 || SPARC || CRIS || MICROBLAZE || SUPERH
  	---help---
  	  sys_sgetmask and sys_ssetmask are obsolete system calls
  	  no longer supported in libc but still enabled by default in some
  	  architectures.
  
  	  If unsure, leave the default option here.

  config SYSFS_SYSCALL
  	bool "Sysfs syscall support" if EXPERT
  	default y
  	---help---
  	  sys_sysfs is an obsolete system call no longer supported in libc.
  	  Note that disabling this option is more secure but might break
  	  compatibility with some systems.
  
  	  If unsure say Y here.

  config SYSCTL_SYSCALL

  	bool "Sysctl syscall support" if EXPERT

  	depends on PROC_SYSCTL

  	default n

  	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 N here.

  config KALLSYMS

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

  	 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 and backtraces (i.e., symbols from the text and inittext
  	   sections). This is sufficient for most cases. And only in very rare
  	   cases (e.g., when a debugger is used) all symbols are required (e.g.,
  	   names of variables from the data sections, etc).
  
  	   This option makes sure that all symbols are loaded into the kernel
  	   image (i.e., symbols from all sections) in cost of increased kernel
  	   size (depending on the kernel configuration, it may be 300KiB or
  	   something like this).
  
  	   Say N unless you really need all symbols.

  config KALLSYMS_ABSOLUTE_PERCPU
  	bool

  	depends on KALLSYMS

  	default X86_64 && SMP

  config KALLSYMS_BASE_RELATIVE
  	bool
  	depends on KALLSYMS
  	default !IA64 && !(TILE && 64BIT)
  	help
  	  Instead of emitting them as absolute values in the native word size,
  	  emit the symbol references in the kallsyms table as 32-bit entries,
  	  each containing a relative value in the range [base, base + U32_MAX]
  	  or, when KALLSYMS_ABSOLUTE_PERCPU is in effect, each containing either
  	  an absolute value in the range [0, S32_MAX] or a relative value in the
  	  range [base, base + S32_MAX], where base is the lowest relative symbol
  	  address encountered in the image.
  
  	  On 64-bit builds, this reduces the size of the address table by 50%,
  	  but more importantly, it results in entries whose values are build
  	  time constants, and no relocation pass is required at runtime to fix
  	  up the entries based on the runtime load address of the kernel.

  config PRINTK
  	default y

  	bool "Enable support for printk" if EXPERT

  	select IRQ_WORK

  	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 PRINTK_NMI
  	def_bool y
  	depends on PRINTK
  	depends on HAVE_NMI

  config BUG

  	bool "BUG() support" if EXPERT

  	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

  	depends on COREDUMP

  	default y

  	bool "Enable ELF core dumps" if EXPERT

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

  config PCSPKR_PLATFORM

  	bool "Enable PC-Speaker support" if EXPERT

  	depends on HAVE_PCSPKR_PLATFORM

  	select I8253_LOCK

  	default y
  	help
            This option allows to disable the internal PC-Speaker
            support, saving some memory.

  config BASE_FULL
  	default y

  	bool "Enable full-sized data structures for core" if EXPERT

  	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 EXPERT

  	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 HAVE_FUTEX_CMPXCHG
  	bool

  	depends on FUTEX

  	help
  	  Architectures should select this if futex_atomic_cmpxchg_inatomic()
  	  is implemented and always working. This removes a couple of runtime
  	  checks.

  config EPOLL

  	bool "Enable eventpoll support" if EXPERT

  	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 EXPERT

  	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 EXPERT

  	select ANON_INODES

  	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 EXPERT

  	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.

  # syscall, maps, verifier
  config BPF_SYSCALL

  	bool "Enable bpf() system call"

  	select ANON_INODES
  	select BPF
  	default n
  	help
  	  Enable the bpf() system call that allows to manipulate eBPF
  	  programs and maps via file descriptors.

  config SHMEM

  	bool "Use full shmem filesystem" if EXPERT

  	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 AIO

  	bool "Enable AIO support" if EXPERT

  	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.

  config ADVISE_SYSCALLS
  	bool "Enable madvise/fadvise syscalls" if EXPERT
  	default y
  	help
  	  This option enables the madvise and fadvise syscalls, used by
  	  applications to advise the kernel about their future memory or file
  	  usage, improving performance. If building an embedded system where no
  	  applications use these syscalls, you can disable this option to save
  	  space.

  config USERFAULTFD
  	bool "Enable userfaultfd() system call"
  	select ANON_INODES

  	depends on MMU
  	help
  	  Enable the userfaultfd() system call that allows to intercept and
  	  handle page faults in userland.

  config PCI_QUIRKS
  	default y
  	bool "Enable PCI quirk workarounds" if EXPERT
  	depends on PCI
  	help
  	  This enables workarounds for various PCI chipset
  	  bugs/quirks. Disable this only if your target machine is
  	  unaffected by PCI quirks.

  config MEMBARRIER
  	bool "Enable membarrier() system call" if EXPERT
  	default y
  	help
  	  Enable the membarrier() system call that allows issuing memory
  	  barriers across all running threads, which can be used to distribute
  	  the cost of user-space memory barriers asymmetrically by transforming
  	  pairs of memory barriers into pairs consisting of membarrier() and a
  	  compiler barrier.
  
  	  If unsure, say Y.

  config EMBEDDED
  	bool "Embedded system"

  	option allnoconfig_y

  	select EXPERT
  	help
  	  This option should be enabled if compiling the kernel for
  	  an embedded system so certain expert options are available
  	  for configuration.

  config HAVE_PERF_EVENTS

  	bool

  	help
  	  See tools/perf/design.txt for details.

  config PERF_USE_VMALLOC
  	bool
  	help
  	  See tools/perf/design.txt for details

  menu "Kernel Performance Events And Counters"

  config PERF_EVENTS

  	bool "Kernel performance events and counters"

  	default y if PROFILING

  	depends on HAVE_PERF_EVENTS

  	select ANON_INODES

  	select IRQ_WORK

  	select SRCU

  	help

  	  Enable kernel support for various performance events provided
  	  by software and hardware.

  	  Software events are supported either built-in or via the

  	  use of generic tracepoints.

  	  Most modern CPUs support performance events via performance
  	  counter registers. These registers count the number of certain

  	  types of hw events: such as instructions executed, cachemisses
  	  suffered, or branches mis-predicted - without slowing down the
  	  kernel or applications. These registers can also trigger interrupts
  	  when a threshold number of events have passed - and can thus be
  	  used to profile the code that runs on that CPU.

  	  The Linux Performance Event subsystem provides an abstraction of

  	  these software and hardware event capabilities, available via a

  	  system call and used by the "perf" utility in tools/perf/. It

  	  provides per task and per CPU counters, and it provides event
  	  capabilities on top of those.
  
  	  Say Y if unsure.

  config DEBUG_PERF_USE_VMALLOC
  	default n
  	bool "Debug: use vmalloc to back perf mmap() buffers"

  	depends on PERF_EVENTS && DEBUG_KERNEL && !PPC

  	select PERF_USE_VMALLOC
  	help
  	 Use vmalloc memory to back perf mmap() buffers.
  
  	 Mostly useful for debugging the vmalloc code on platforms
  	 that don't require it.
  
  	 Say N if unsure.

  endmenu

  config VM_EVENT_COUNTERS
  	default y

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

  	help

  	  VM event counters are needed for event counts to be shown.
  	  This option allows the disabling of the VM event counters

  	  on EXPERT 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 EXPERT

  	depends on SLUB && SYSFS

  	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.

  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

  	  disabled, and can be overridden at runtime by setting

  	  /proc/sys/kernel/randomize_va_space to 2.
  
  	  On non-ancient distros (post-2000 ones) N is usually a safe choice.

  choice
  	prompt "Choose SLAB allocator"

  	default SLUB

  	help
  	   This option allows to select a slab allocator.
  
  config SLAB
  	bool "SLAB"

  	select HAVE_HARDENED_USERCOPY_ALLOCATOR

  	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.

  
  config SLUB

  	bool "SLUB (Unqueued Allocator)"

  	select HAVE_HARDENED_USERCOPY_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. SLUB is the default choice for
  	   a slab allocator.

  
  config SLOB

  	depends on EXPERT

  	bool "SLOB (Simple Allocator)"
  	help

  	   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.

  
  endchoice

  config SLAB_FREELIST_RANDOM
  	default n

  	depends on SLAB || SLUB

  	bool "SLAB freelist randomization"
  	help

  	  Randomizes the freelist order used on creating new pages. This

  	  security feature reduces the predictability of the kernel slab
  	  allocator against heap overflows.

  config SLUB_CPU_PARTIAL
  	default y

  	depends on SLUB && SMP

  	bool "SLUB per cpu partial cache"
  	help
  	  Per cpu partial caches accellerate objects allocation and freeing
  	  that is local to a processor at the price of more indeterminism
  	  in the latency of the free. On overflow these caches will be cleared
  	  which requires the taking of locks that may cause latency spikes.
  	  Typically one would choose no for a realtime system.

  config MMAP_ALLOW_UNINITIALIZED
  	bool "Allow mmapped anonymous memory to be uninitialized"

  	depends on EXPERT && !MMU

  	default n
  	help
  	  Normally, and according to the Linux spec, anonymous memory obtained
  	  from mmap() has it's contents cleared before it is passed to
  	  userspace.  Enabling this config option allows you to request that
  	  mmap() skip that if it is given an MAP_UNINITIALIZED flag, thus
  	  providing a huge performance boost.  If this option is not enabled,
  	  then the flag will be ignored.
  
  	  This is taken advantage of by uClibc's malloc(), and also by
  	  ELF-FDPIC binfmt's brk and stack allocator.
  
  	  Because of the obvious security issues, this option should only be
  	  enabled on embedded devices where you control what is run in
  	  userspace.  Since that isn't generally a problem on no-MMU systems,
  	  it is normally safe to say Y here.
  
  	  See Documentation/nommu-mmap.txt for more information.

  config SYSTEM_DATA_VERIFICATION
  	def_bool n
  	select SYSTEM_TRUSTED_KEYRING
  	select KEYS
  	select CRYPTO

  	select CRYPTO_RSA

  	select ASYMMETRIC_KEY_TYPE
  	select ASYMMETRIC_PUBLIC_KEY_SUBTYPE

  	select ASN1
  	select OID_REGISTRY
  	select X509_CERTIFICATE_PARSER
  	select PKCS7_MESSAGE_PARSER

  	help

  	  Provide PKCS#7 message verification using the contents of the system
  	  trusted keyring to provide public keys.  This then can be used for
  	  module verification, kexec image verification and firmware blob
  	  verification.

  config PROFILING

  	bool "Profiling support"

  	help
  	  Say Y here to enable the extended profiling support mechanisms used
  	  by profilers such as OProfile.

  #
  # Place an empty function call at each tracepoint site. Can be
  # dynamically changed for a probe function.
  #

  config TRACEPOINTS

  	bool

  source "arch/Kconfig"

  endmenu		# General setup

  config HAVE_GENERIC_DMA_COHERENT
  	bool
  	default n

  config SLABINFO
  	bool
  	depends on PROC_FS

  	depends on SLAB || SLUB_DEBUG

  	default y

  config RT_MUTEXES

  	bool

  config BASE_SMALL
  	int
  	default 0 if BASE_FULL
  	default 1 if !BASE_FULL

  menuconfig MODULES

  	bool "Enable loadable module support"

  	option modules

  	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.

  if MODULES

  config MODULE_FORCE_LOAD
  	bool "Forced module loading"

  	default n
  	help

  	  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.

  config MODULE_UNLOAD
  	bool "Module unloading"

  	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 smaller, faster
  	  and simpler.  If unsure, say Y.

  
  config MODULE_FORCE_UNLOAD
  	bool "Forced module unloading"

  	depends on MODULE_UNLOAD

  	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"

  	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"

  	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 MODULE_SIG
  	bool "Module signature verification"
  	depends on MODULES

  	select SYSTEM_DATA_VERIFICATION

  	help
  	  Check modules for valid signatures upon load: the signature
  	  is simply appended to the module. For more information see
  	  Documentation/module-signing.txt.

  	  Note that this option adds the OpenSSL development packages as a
  	  kernel build dependency so that the signing tool can use its crypto
  	  library.

  	  !!!WARNING!!!  If you enable this option, you MUST make sure that the
  	  module DOES NOT get stripped after being signed.  This includes the
  	  debuginfo strip done by some packagers (such as rpmbuild) and
  	  inclusion into an initramfs that wants the module size reduced.

  config MODULE_SIG_FORCE
  	bool "Require modules to be validly signed"
  	depends on MODULE_SIG
  	help
  	  Reject unsigned modules or signed modules for which we don't have a
  	  key.  Without this, such modules will simply taint the kernel.

  config MODULE_SIG_ALL
  	bool "Automatically sign all modules"
  	default y
  	depends on MODULE_SIG
  	help
  	  Sign all modules during make modules_install. Without this option,
  	  modules must be signed manually, using the scripts/sign-file tool.
  
  comment "Do not forget to sign required modules with scripts/sign-file"
  	depends on MODULE_SIG_FORCE && !MODULE_SIG_ALL

  choice
  	prompt "Which hash algorithm should modules be signed with?"
  	depends on MODULE_SIG
  	help
  	  This determines which sort of hashing algorithm will be used during
  	  signature generation.  This algorithm _must_ be built into the kernel
  	  directly so that signature verification can take place.  It is not
  	  possible to load a signed module containing the algorithm to check
  	  the signature on that module.
  
  config MODULE_SIG_SHA1
  	bool "Sign modules with SHA-1"
  	select CRYPTO_SHA1
  
  config MODULE_SIG_SHA224
  	bool "Sign modules with SHA-224"
  	select CRYPTO_SHA256
  
  config MODULE_SIG_SHA256
  	bool "Sign modules with SHA-256"
  	select CRYPTO_SHA256
  
  config MODULE_SIG_SHA384
  	bool "Sign modules with SHA-384"
  	select CRYPTO_SHA512
  
  config MODULE_SIG_SHA512
  	bool "Sign modules with SHA-512"
  	select CRYPTO_SHA512
  
  endchoice

  config MODULE_SIG_HASH
  	string
  	depends on MODULE_SIG
  	default "sha1" if MODULE_SIG_SHA1
  	default "sha224" if MODULE_SIG_SHA224
  	default "sha256" if MODULE_SIG_SHA256
  	default "sha384" if MODULE_SIG_SHA384
  	default "sha512" if MODULE_SIG_SHA512

  config MODULE_COMPRESS
  	bool "Compress modules on installation"
  	depends on MODULES
  	help

  	  Compresses kernel modules when 'make modules_install' is run; gzip or
  	  xz depending on "Compression algorithm" below.

  	  module-init-tools MAY support gzip, and kmod MAY support gzip and xz.

  	  Out-of-tree kernel modules installed using Kbuild will also be
  	  compressed upon installation.

  	  Note: for modules inside an initrd or initramfs, it's more efficient
  	  to compress the whole initrd or initramfs instead.

  	  Note: This is fully compatible with signed modules.
  
  	  If in doubt, say N.

  
  choice
  	prompt "Compression algorithm"
  	depends on MODULE_COMPRESS
  	default MODULE_COMPRESS_GZIP
  	help
  	  This determines which sort of compression will be used during
  	  'make modules_install'.
  
  	  GZIP (default) and XZ are supported.
  
  config MODULE_COMPRESS_GZIP
  	bool "GZIP"
  
  config MODULE_COMPRESS_XZ
  	bool "XZ"
  
  endchoice

  config TRIM_UNUSED_KSYMS
  	bool "Trim unused exported kernel symbols"
  	depends on MODULES && !UNUSED_SYMBOLS
  	help
  	  The kernel and some modules make many symbols available for
  	  other modules to use via EXPORT_SYMBOL() and variants. Depending
  	  on the set of modules being selected in your kernel configuration,
  	  many of those exported symbols might never be used.
  
  	  This option allows for unused exported symbols to be dropped from
  	  the build. In turn, this provides the compiler more opportunities
  	  (especially when using LTO) for optimizing the code and reducing
  	  binary size.  This might have some security advantages as well.

  	  If unsure, or if you need to build out-of-tree modules, say N.

  endif # MODULES

  config MODULES_TREE_LOOKUP
  	def_bool y
  	depends on PERF_EVENTS || TRACING

  config INIT_ALL_POSSIBLE
  	bool
  	help

  	  Back when each arch used to define their own cpu_online_mask and
  	  cpu_possible_mask, some of them chose to initialize cpu_possible_mask

  	  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

  	  and have several arch maintainers pursuing me down dark alleys.

  source "block/Kconfig"

  
  config PREEMPT_NOTIFIERS
  	bool

  config PADATA
  	depends on SMP
  	bool

  # Can be selected by architectures with broken toolchains
  # that get confused by correct const<->read_only section
  # mappings
  config BROKEN_RODATA
  	bool

  config ASN1
  	tristate
  	help
  	  Build a simple ASN.1 grammar compiler that produces a bytecode output
  	  that can be interpreted by the ASN.1 stream decoder and used to
  	  inform it as to what tags are to be expected in a stream and what
  	  functions to call on what tags.

  source "kernel/Kconfig.locks"