config PRINTK_TIME
  	bool "Show timing information on printks"

  	depends on PRINTK

  	help
  	  Selecting this option causes timing information to be
  	  included in printk output.  This allows you to measure
  	  the interval between kernel operations, including bootup
  	  operations.  This is useful for identifying long delays

  	  in kernel startup.  Or add printk.time=1 at boot-time.
  	  See Documentation/kernel-parameters.txt

  config DEFAULT_MESSAGE_LOGLEVEL
  	int "Default message log level (1-7)"
  	range 1 7
  	default "4"
  	help
  	  Default log level for printk statements with no specified priority.
  
  	  This was hard-coded to KERN_WARNING since at least 2.6.10 but folks
  	  that are auditing their logs closely may want to set it to a lower
  	  priority.

  config ENABLE_WARN_DEPRECATED
  	bool "Enable __deprecated logic"
  	default y
  	help
  	  Enable the __deprecated logic in the kernel build.
  	  Disable this to suppress the "warning: 'foo' is deprecated
  	  (declared at kernel/power/somefile.c:1234)" messages.

  config ENABLE_MUST_CHECK
  	bool "Enable __must_check logic"
  	default y
  	help
  	  Enable the __must_check logic in the kernel build.  Disable this to
  	  suppress the "warning: ignoring return value of 'foo', declared with
  	  attribute warn_unused_result" messages.

  config FRAME_WARN
  	int "Warn for stack frames larger than (needs gcc 4.4)"
  	range 0 8192
  	default 1024 if !64BIT
  	default 2048 if 64BIT
  	help
  	  Tell gcc to warn at build time for stack frames larger than this.
  	  Setting this too low will cause a lot of warnings.
  	  Setting it to 0 disables the warning.
  	  Requires gcc 4.4

  config MAGIC_SYSRQ
  	bool "Magic SysRq key"

  	depends on !UML

  	help
  	  If you say Y here, you will have some control over the system even
  	  if the system crashes for example during kernel debugging (e.g., you
  	  will be able to flush the buffer cache to disk, reboot the system
  	  immediately or dump some status information). This is accomplished
  	  by pressing various keys while holding SysRq (Alt+PrintScreen). It
  	  also works on a serial console (on PC hardware at least), if you
  	  send a BREAK and then within 5 seconds a command keypress. The
  	  keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
  	  unless you really know what this hack does.

  config STRIP_ASM_SYMS
  	bool "Strip assembler-generated symbols during link"
  	default n
  	help
  	  Strip internal assembler-generated symbols during a link (symbols
  	  that look like '.Lxxx') so they don't pollute the output of
  	  get_wchan() and suchlike.

  config UNUSED_SYMBOLS
  	bool "Enable unused/obsolete exported symbols"
  	default y if X86
  	help
  	  Unused but exported symbols make the kernel needlessly bigger.  For
  	  that reason most of these unused exports will soon be removed.  This
  	  option is provided temporarily to provide a transition period in case
  	  some external kernel module needs one of these symbols anyway. If you
  	  encounter such a case in your module, consider if you are actually
  	  using the right API.  (rationale: since nobody in the kernel is using
  	  this in a module, there is a pretty good chance it's actually the
  	  wrong interface to use).  If you really need the symbol, please send a
  	  mail to the linux kernel mailing list mentioning the symbol and why
  	  you really need it, and what the merge plan to the mainline kernel for
  	  your module is.

  config DEBUG_FS
  	bool "Debug Filesystem"

  	help
  	  debugfs is a virtual file system that kernel developers use to put
  	  debugging files into.  Enable this option to be able to read and
  	  write to these files.

  	  For detailed documentation on the debugfs API, see
  	  Documentation/DocBook/filesystems.

  	  If unsure, say N.
  
  config HEADERS_CHECK
  	bool "Run 'make headers_check' when building vmlinux"
  	depends on !UML
  	help
  	  This option will extract the user-visible kernel headers whenever
  	  building the kernel, and will run basic sanity checks on them to
  	  ensure that exported files do not attempt to include files which
  	  were not exported, etc.
  
  	  If you're making modifications to header files which are
  	  relevant for userspace, say 'Y', and check the headers
  	  exported to $(INSTALL_HDR_PATH) (usually 'usr/include' in
  	  your build tree), to make sure they're suitable.

  config DEBUG_SECTION_MISMATCH
  	bool "Enable full Section mismatch analysis"

  	help
  	  The section mismatch analysis checks if there are illegal
  	  references from one section to another section.

  	  During linktime or runtime, some sections are dropped;
  	  any use of code/data previously in these sections would

  	  most likely result in an oops.

  	  In the code, functions and variables are annotated with
  	  __init, __devinit, etc. (see the full list in include/linux/init.h),

  	  which results in the code/data being placed in specific sections.

  	  The section mismatch analysis is always performed after a full
  	  kernel build, and enabling this option causes the following
  	  additional steps to occur:
  	  - Add the option -fno-inline-functions-called-once to gcc commands.
  	    When inlining a function annotated with __init in a non-init
  	    function, we would lose the section information and thus

  	    the analysis would not catch the illegal reference.

  	    This option tells gcc to inline less (but it does result in
  	    a larger kernel).
  	  - Run the section mismatch analysis for each module/built-in.o file.
  	    When we run the section mismatch analysis on vmlinux.o, we

  	    lose valueble information about where the mismatch was

  	    introduced.
  	    Running the analysis for each module/built-in.o file

  	    tells where the mismatch happens much closer to the
  	    source. The drawback is that the same mismatch is
  	    reported at least twice.
  	  - Enable verbose reporting from modpost in order to help resolve
  	    the section mismatches that are reported.

  config DEBUG_KERNEL
  	bool "Kernel debugging"
  	help
  	  Say Y here if you are developing drivers or trying to debug and
  	  identify kernel problems.

  config DEBUG_SHIRQ
  	bool "Debug shared IRQ handlers"
  	depends on DEBUG_KERNEL && GENERIC_HARDIRQS
  	help
  	  Enable this to generate a spurious interrupt as soon as a shared
  	  interrupt handler is registered, and just before one is deregistered.
  	  Drivers ought to be able to handle interrupts coming in at those
  	  points; some don't and need to be caught.

  config LOCKUP_DETECTOR
  	bool "Detect Hard and Soft Lockups"

  	depends on DEBUG_KERNEL && !S390

  	help

  	  Say Y here to enable the kernel to act as a watchdog to detect
  	  hard and soft lockups.
  
  	  Softlockups are bugs that cause the kernel to loop in kernel

  	  mode for more than 60 seconds, without giving other tasks a

  	  chance to run.  The current stack trace is displayed upon
  	  detection and the system will stay locked up.

  	  Hardlockups are bugs that cause the CPU to loop in kernel mode
  	  for more than 60 seconds, without letting other interrupts have a
  	  chance to run.  The current stack trace is displayed upon detection
  	  and the system will stay locked up.

  	  The overhead should be minimal.  A periodic hrtimer runs to
  	  generate interrupts and kick the watchdog task every 10-12 seconds.
  	  An NMI is generated every 60 seconds or so to check for hardlockups.

  config HARDLOCKUP_DETECTOR

  	def_bool LOCKUP_DETECTOR && PERF_EVENTS && HAVE_PERF_EVENTS_NMI && \
  		 !ARCH_HAS_NMI_WATCHDOG

  config BOOTPARAM_HARDLOCKUP_PANIC
  	bool "Panic (Reboot) On Hard Lockups"
  	depends on LOCKUP_DETECTOR
  	help
  	  Say Y here to enable the kernel to panic on "hard lockups",
  	  which are bugs that cause the kernel to loop in kernel
  	  mode with interrupts disabled for more than 60 seconds.
  
  	  Say N if unsure.
  
  config BOOTPARAM_HARDLOCKUP_PANIC_VALUE
  	int
  	depends on LOCKUP_DETECTOR
  	range 0 1
  	default 0 if !BOOTPARAM_HARDLOCKUP_PANIC
  	default 1 if BOOTPARAM_HARDLOCKUP_PANIC

  config BOOTPARAM_SOFTLOCKUP_PANIC
  	bool "Panic (Reboot) On Soft Lockups"

  	depends on LOCKUP_DETECTOR

  	help
  	  Say Y here to enable the kernel to panic on "soft lockups",
  	  which are bugs that cause the kernel to loop in kernel
  	  mode for more than 60 seconds, without giving other tasks a
  	  chance to run.
  
  	  The panic can be used in combination with panic_timeout,
  	  to cause the system to reboot automatically after a
  	  lockup has been detected. This feature is useful for
  	  high-availability systems that have uptime guarantees and
  	  where a lockup must be resolved ASAP.
  
  	  Say N if unsure.
  
  config BOOTPARAM_SOFTLOCKUP_PANIC_VALUE
  	int

  	depends on LOCKUP_DETECTOR

  	range 0 1
  	default 0 if !BOOTPARAM_SOFTLOCKUP_PANIC
  	default 1 if BOOTPARAM_SOFTLOCKUP_PANIC

  config DETECT_HUNG_TASK
  	bool "Detect Hung Tasks"
  	depends on DEBUG_KERNEL

  	default LOCKUP_DETECTOR

  	help
  	  Say Y here to enable the kernel to detect "hung tasks",
  	  which are bugs that cause the task to be stuck in
  	  uninterruptible "D" state indefinitiley.
  
  	  When a hung task is detected, the kernel will print the
  	  current stack trace (which you should report), but the
  	  task will stay in uninterruptible state. If lockdep is
  	  enabled then all held locks will also be reported. This
  	  feature has negligible overhead.

  config DEFAULT_HUNG_TASK_TIMEOUT
  	int "Default timeout for hung task detection (in seconds)"
  	depends on DETECT_HUNG_TASK
  	default 120
  	help
  	  This option controls the default timeout (in seconds) used
  	  to determine when a task has become non-responsive and should
  	  be considered hung.

  	  It can be adjusted at runtime via the kernel.hung_task_timeout_secs
  	  sysctl or by writing a value to
  	  /proc/sys/kernel/hung_task_timeout_secs.

  
  	  A timeout of 0 disables the check.  The default is two minutes.
  	  Keeping the default should be fine in most cases.

  config BOOTPARAM_HUNG_TASK_PANIC
  	bool "Panic (Reboot) On Hung Tasks"
  	depends on DETECT_HUNG_TASK
  	help
  	  Say Y here to enable the kernel to panic on "hung tasks",
  	  which are bugs that cause the kernel to leave a task stuck
  	  in uninterruptible "D" state.
  
  	  The panic can be used in combination with panic_timeout,
  	  to cause the system to reboot automatically after a
  	  hung task has been detected. This feature is useful for
  	  high-availability systems that have uptime guarantees and
  	  where a hung tasks must be resolved ASAP.
  
  	  Say N if unsure.
  
  config BOOTPARAM_HUNG_TASK_PANIC_VALUE
  	int
  	depends on DETECT_HUNG_TASK
  	range 0 1
  	default 0 if !BOOTPARAM_HUNG_TASK_PANIC
  	default 1 if BOOTPARAM_HUNG_TASK_PANIC

  config SCHED_DEBUG
  	bool "Collect scheduler debugging info"
  	depends on DEBUG_KERNEL && PROC_FS
  	default y
  	help
  	  If you say Y here, the /proc/sched_debug file will be provided
  	  that can help debug the scheduler. The runtime overhead of this
  	  option is minimal.

  config SCHEDSTATS
  	bool "Collect scheduler statistics"
  	depends on DEBUG_KERNEL && PROC_FS
  	help
  	  If you say Y here, additional code will be inserted into the
  	  scheduler and related routines to collect statistics about
  	  scheduler behavior and provide them in /proc/schedstat.  These
  	  stats may be useful for both tuning and debugging the scheduler
  	  If you aren't debugging the scheduler or trying to tune a specific
  	  application, you can say N to avoid the very slight overhead
  	  this adds.

  config TIMER_STATS
  	bool "Collect kernel timers statistics"
  	depends on DEBUG_KERNEL && PROC_FS
  	help
  	  If you say Y here, additional code will be inserted into the
  	  timer routines to collect statistics about kernel timers being
  	  reprogrammed. The statistics can be read from /proc/timer_stats.
  	  The statistics collection is started by writing 1 to /proc/timer_stats,
  	  writing 0 stops it. This feature is useful to collect information

  	  about timer usage patterns in kernel and userspace. This feature
  	  is lightweight if enabled in the kernel config but not activated
  	  (it defaults to deactivated on bootup and will only be activated
  	  if some application like powertop activates it explicitly).

  config DEBUG_OBJECTS
  	bool "Debug object operations"
  	depends on DEBUG_KERNEL
  	help
  	  If you say Y here, additional code will be inserted into the
  	  kernel to track the life time of various objects and validate
  	  the operations on those objects.
  
  config DEBUG_OBJECTS_SELFTEST
  	bool "Debug objects selftest"
  	depends on DEBUG_OBJECTS
  	help
  	  This enables the selftest of the object debug code.
  
  config DEBUG_OBJECTS_FREE
  	bool "Debug objects in freed memory"
  	depends on DEBUG_OBJECTS
  	help
  	  This enables checks whether a k/v free operation frees an area
  	  which contains an object which has not been deactivated
  	  properly. This can make kmalloc/kfree-intensive workloads
  	  much slower.

  config DEBUG_OBJECTS_TIMERS
  	bool "Debug timer objects"
  	depends on DEBUG_OBJECTS
  	help
  	  If you say Y here, additional code will be inserted into the
  	  timer routines to track the life time of timer objects and
  	  validate the timer operations.

  config DEBUG_OBJECTS_WORK
  	bool "Debug work objects"
  	depends on DEBUG_OBJECTS
  	help
  	  If you say Y here, additional code will be inserted into the
  	  work queue routines to track the life time of work objects and
  	  validate the work operations.

  config DEBUG_OBJECTS_RCU_HEAD
  	bool "Debug RCU callbacks objects"

  	depends on DEBUG_OBJECTS

  	help
  	  Enable this to turn on debugging of RCU list heads (call_rcu() usage).

  config DEBUG_OBJECTS_PERCPU_COUNTER
  	bool "Debug percpu counter objects"
  	depends on DEBUG_OBJECTS
  	help
  	  If you say Y here, additional code will be inserted into the
  	  percpu counter routines to track the life time of percpu counter
  	  objects and validate the percpu counter operations.

  config DEBUG_OBJECTS_ENABLE_DEFAULT
  	int "debug_objects bootup default value (0-1)"
          range 0 1
          default "1"
          depends on DEBUG_OBJECTS
          help
            Debug objects boot parameter default value

  config DEBUG_SLAB

  	bool "Debug slab memory allocations"

  	depends on DEBUG_KERNEL && SLAB && !KMEMCHECK

  	help
  	  Say Y here to have the kernel do limited verification on memory
  	  allocation as well as poisoning memory on free to catch use of freed
  	  memory. This can make kmalloc/kfree-intensive workloads much slower.

  config DEBUG_SLAB_LEAK
  	bool "Memory leak debugging"
  	depends on DEBUG_SLAB

  config SLUB_DEBUG_ON
  	bool "SLUB debugging on by default"

  	depends on SLUB && SLUB_DEBUG && !KMEMCHECK

  	default n
  	help
  	  Boot with debugging on by default. SLUB boots by default with
  	  the runtime debug capabilities switched off. Enabling this is
  	  equivalent to specifying the "slub_debug" parameter on boot.
  	  There is no support for more fine grained debug control like
  	  possible with slub_debug=xxx. SLUB debugging may be switched
  	  off in a kernel built with CONFIG_SLUB_DEBUG_ON by specifying
  	  "slub_debug=-".

  config SLUB_STATS
  	default n
  	bool "Enable SLUB performance statistics"

  	depends on SLUB && SYSFS

  	help
  	  SLUB statistics are useful to debug SLUBs allocation behavior in
  	  order find ways to optimize the allocator. This should never be
  	  enabled for production use since keeping statistics slows down
  	  the allocator by a few percentage points. The slabinfo command
  	  supports the determination of the most active slabs to figure
  	  out which slabs are relevant to a particular load.
  	  Try running: slabinfo -DA

  config DEBUG_KMEMLEAK
  	bool "Kernel memory leak detector"

  	depends on DEBUG_KERNEL && EXPERIMENTAL && \

  		(X86 || ARM || PPC || MIPS || S390 || SPARC64 || SUPERH || MICROBLAZE || TILE)

  	select DEBUG_FS

  	select STACKTRACE if STACKTRACE_SUPPORT
  	select KALLSYMS

  	select CRC32

  	help
  	  Say Y here if you want to enable the memory leak
  	  detector. The memory allocation/freeing is traced in a way
  	  similar to the Boehm's conservative garbage collector, the
  	  difference being that the orphan objects are not freed but
  	  only shown in /sys/kernel/debug/kmemleak. Enabling this
  	  feature will introduce an overhead to memory
  	  allocations. See Documentation/kmemleak.txt for more
  	  details.

  	  Enabling DEBUG_SLAB or SLUB_DEBUG may increase the chances
  	  of finding leaks due to the slab objects poisoning.

  	  In order to access the kmemleak file, debugfs needs to be
  	  mounted (usually at /sys/kernel/debug).

  config DEBUG_KMEMLEAK_EARLY_LOG_SIZE
  	int "Maximum kmemleak early log entries"
  	depends on DEBUG_KMEMLEAK

  	range 200 40000

  	default 400
  	help
  	  Kmemleak must track all the memory allocations to avoid
  	  reporting false positives. Since memory may be allocated or
  	  freed before kmemleak is initialised, an early log buffer is
  	  used to store these actions. If kmemleak reports "early log
  	  buffer exceeded", please increase this value.

  config DEBUG_KMEMLEAK_TEST
  	tristate "Simple test for the kernel memory leak detector"

  	depends on DEBUG_KMEMLEAK && m

  	help

  	  This option enables a module that explicitly leaks memory.

  
  	  If unsure, say N.

  config DEBUG_KMEMLEAK_DEFAULT_OFF
  	bool "Default kmemleak to off"
  	depends on DEBUG_KMEMLEAK
  	help
  	  Say Y here to disable kmemleak by default. It can then be enabled
  	  on the command line via kmemleak=on.

  config DEBUG_PREEMPT
  	bool "Debug preemptible kernel"

  	depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT

  	default y
  	help
  	  If you say Y here then the kernel will use a debug variant of the
  	  commonly used smp_processor_id() function and will print warnings
  	  if kernel code uses it in a preemption-unsafe way. Also, the kernel
  	  will detect preemption count underflows.

  config DEBUG_RT_MUTEXES
  	bool "RT Mutex debugging, deadlock detection"

  	depends on DEBUG_KERNEL && RT_MUTEXES
  	help
  	 This allows rt mutex semantics violations and rt mutex related
  	 deadlocks (lockups) to be detected and reported automatically.
  
  config DEBUG_PI_LIST
  	bool
  	default y
  	depends on DEBUG_RT_MUTEXES

  config RT_MUTEX_TESTER
  	bool "Built-in scriptable tester for rt-mutexes"

  	depends on DEBUG_KERNEL && RT_MUTEXES

  	help
  	  This option enables a rt-mutex tester.

  config DEBUG_SPINLOCK

  	bool "Spinlock and rw-lock debugging: basic checks"

  	depends on DEBUG_KERNEL
  	help
  	  Say Y here and build SMP to catch missing spinlock initialization
  	  and certain other kinds of spinlock errors commonly made.  This is
  	  best used in conjunction with the NMI watchdog so that spinlock
  	  deadlocks are also debuggable.

  config DEBUG_MUTEXES
  	bool "Mutex debugging: basic checks"
  	depends on DEBUG_KERNEL
  	help
  	 This feature allows mutex semantics violations to be detected and
  	 reported.

  config DEBUG_LOCK_ALLOC
  	bool "Lock debugging: detect incorrect freeing of live locks"

  	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT

  	select DEBUG_SPINLOCK
  	select DEBUG_MUTEXES

  	select LOCKDEP
  	help
  	 This feature will check whether any held lock (spinlock, rwlock,
  	 mutex or rwsem) is incorrectly freed by the kernel, via any of the
  	 memory-freeing routines (kfree(), kmem_cache_free(), free_pages(),
  	 vfree(), etc.), whether a live lock is incorrectly reinitialized via
  	 spin_lock_init()/mutex_init()/etc., or whether there is any lock
  	 held during task exit.
  
  config PROVE_LOCKING
  	bool "Lock debugging: prove locking correctness"

  	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT

  	select LOCKDEP
  	select DEBUG_SPINLOCK
  	select DEBUG_MUTEXES

  	select DEBUG_LOCK_ALLOC

  	select TRACE_IRQFLAGS

  	default n
  	help
  	 This feature enables the kernel to prove that all locking
  	 that occurs in the kernel runtime is mathematically
  	 correct: that under no circumstance could an arbitrary (and
  	 not yet triggered) combination of observed locking
  	 sequences (on an arbitrary number of CPUs, running an
  	 arbitrary number of tasks and interrupt contexts) cause a
  	 deadlock.
  
  	 In short, this feature enables the kernel to report locking
  	 related deadlocks before they actually occur.
  
  	 The proof does not depend on how hard and complex a
  	 deadlock scenario would be to trigger: how many
  	 participant CPUs, tasks and irq-contexts would be needed
  	 for it to trigger. The proof also does not depend on
  	 timing: if a race and a resulting deadlock is possible
  	 theoretically (no matter how unlikely the race scenario
  	 is), it will be proven so and will immediately be
  	 reported by the kernel (once the event is observed that
  	 makes the deadlock theoretically possible).
  
  	 If a deadlock is impossible (i.e. the locking rules, as
  	 observed by the kernel, are mathematically correct), the
  	 kernel reports nothing.
  
  	 NOTE: this feature can also be enabled for rwlocks, mutexes
  	 and rwsems - in which case all dependencies between these
  	 different locking variants are observed and mapped too, and
  	 the proof of observed correctness is also maintained for an
  	 arbitrary combination of these separate locking variants.
  
  	 For more details, see Documentation/lockdep-design.txt.

  config PROVE_RCU
  	bool "RCU debugging: prove RCU correctness"
  	depends on PROVE_LOCKING
  	default n
  	help
  	 This feature enables lockdep extensions that check for correct
  	 use of RCU APIs.  This is currently under development.  Say Y
  	 if you want to debug RCU usage or help work on the PROVE_RCU
  	 feature.
  
  	 Say N if you are unsure.

  config PROVE_RCU_REPEATEDLY
  	bool "RCU debugging: don't disable PROVE_RCU on first splat"
  	depends on PROVE_RCU
  	default n
  	help
  	 By itself, PROVE_RCU will disable checking upon issuing the
  	 first warning (or "splat").  This feature prevents such
  	 disabling, allowing multiple RCU-lockdep warnings to be printed
  	 on a single reboot.

  	 Say Y to allow multiple RCU-lockdep warnings per boot.
  
  	 Say N if you are unsure.

  config SPARSE_RCU_POINTER
  	bool "RCU debugging: sparse-based checks for pointer usage"
  	default n
  	help
  	 This feature enables the __rcu sparse annotation for
  	 RCU-protected pointers.  This annotation will cause sparse
  	 to flag any non-RCU used of annotated pointers.  This can be
  	 helpful when debugging RCU usage.  Please note that this feature
  	 is not intended to enforce code cleanliness; it is instead merely
  	 a debugging aid.
  
  	 Say Y to make sparse flag questionable use of RCU-protected pointers

  	 Say N if you are unsure.

  config LOCKDEP
  	bool

  	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT

  	select STACKTRACE

  	select FRAME_POINTER if !MIPS && !PPC && !ARM_UNWIND && !S390 && !MICROBLAZE

  	select KALLSYMS
  	select KALLSYMS_ALL

  config LOCK_STAT

  	bool "Lock usage statistics"

  	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
  	select LOCKDEP
  	select DEBUG_SPINLOCK
  	select DEBUG_MUTEXES
  	select DEBUG_LOCK_ALLOC
  	default n
  	help
  	 This feature enables tracking lock contention points

  	 For more details, see Documentation/lockstat.txt

  	 This also enables lock events required by "perf lock",
  	 subcommand of perf.
  	 If you want to use "perf lock", you also need to turn on
  	 CONFIG_EVENT_TRACING.

  
  	 CONFIG_LOCK_STAT defines "contended" and "acquired" lock events.

  	 (CONFIG_LOCKDEP defines "acquire" and "release" events.)

  config DEBUG_LOCKDEP
  	bool "Lock dependency engine debugging"

  	depends on DEBUG_KERNEL && LOCKDEP

  	help
  	  If you say Y here, the lock dependency engine will do
  	  additional runtime checks to debug itself, at the price
  	  of more runtime overhead.
  
  config TRACE_IRQFLAGS
  	bool

  	help
  	  Enables hooks to interrupt enabling and disabling for
  	  either tracing or lock debugging.

  config DEBUG_ATOMIC_SLEEP
  	bool "Sleep inside atomic section checking"

  	select PREEMPT_COUNT

  	depends on DEBUG_KERNEL
  	help
  	  If you say Y here, various routines which may sleep will become very

  	  noisy if they are called inside atomic sections: when a spinlock is
  	  held, inside an rcu read side critical section, inside preempt disabled
  	  sections, inside an interrupt, etc...

  config DEBUG_LOCKING_API_SELFTESTS
  	bool "Locking API boot-time self-tests"
  	depends on DEBUG_KERNEL
  	help
  	  Say Y here if you want the kernel to run a short self-test during
  	  bootup. The self-test checks whether common types of locking bugs
  	  are detected by debugging mechanisms or not. (if you disable
  	  lock debugging then those bugs wont be detected of course.)
  	  The following locking APIs are covered: spinlocks, rwlocks,
  	  mutexes and rwsems.

  config STACKTRACE
  	bool
  	depends on STACKTRACE_SUPPORT

  config DEBUG_STACK_USAGE
  	bool "Stack utilization instrumentation"
  	depends on DEBUG_KERNEL
  	help
  	  Enables the display of the minimum amount of free stack which each
  	  task has ever had available in the sysrq-T and sysrq-P debug output.
  
  	  This option will slow down process creation somewhat.

  config DEBUG_KOBJECT
  	bool "kobject debugging"
  	depends on DEBUG_KERNEL
  	help
  	  If you say Y here, some extra kobject debugging messages will be sent
  	  to the syslog. 
  
  config DEBUG_HIGHMEM
  	bool "Highmem debugging"
  	depends on DEBUG_KERNEL && HIGHMEM
  	help
  	  This options enables addition error checking for high memory systems.
  	  Disable for production systems.
  
  config DEBUG_BUGVERBOSE

  	bool "Verbose BUG() reporting (adds 70K)" if DEBUG_KERNEL && EXPERT

  	depends on BUG

  	depends on ARM || AVR32 || M32R || M68K || SPARC32 || SPARC64 || \

  		   FRV || SUPERH || GENERIC_BUG || BLACKFIN || MN10300 || TILE

  	default y

  	help
  	  Say Y here to make BUG() panics output the file name and line number
  	  of the BUG call as well as the EIP and oops trace.  This aids
  	  debugging but costs about 70-100K of memory.
  
  config DEBUG_INFO
  	bool "Compile the kernel with debug info"
  	depends on DEBUG_KERNEL
  	help
            If you say Y here the resulting kernel image will include
  	  debugging info resulting in a larger kernel image.

  	  This adds debug symbols to the kernel and modules (gcc -g), and
  	  is needed if you intend to use kernel crashdump or binary object
  	  tools like crash, kgdb, LKCD, gdb, etc on the kernel.

  	  Say Y here only if you plan to debug the kernel.
  
  	  If unsure, say N.

  config DEBUG_INFO_REDUCED
  	bool "Reduce debugging information"
  	depends on DEBUG_INFO
  	help
  	  If you say Y here gcc is instructed to generate less debugging
  	  information for structure types. This means that tools that
  	  need full debugging information (like kgdb or systemtap) won't
  	  be happy. But if you merely need debugging information to
  	  resolve line numbers there is no loss. Advantage is that
  	  build directory object sizes shrink dramatically over a full
  	  DEBUG_INFO build and compile times are reduced too.
  	  Only works with newer gcc versions.

  config DEBUG_VM
  	bool "Debug VM"
  	depends on DEBUG_KERNEL
  	help

  	  Enable this to turn on extended checks in the virtual-memory system
            that may impact performance.

  
  	  If unsure, say N.

  config DEBUG_VIRTUAL
  	bool "Debug VM translations"
  	depends on DEBUG_KERNEL && X86
  	help
  	  Enable some costly sanity checks in virtual to page code. This can
  	  catch mistakes with virt_to_page() and friends.
  
  	  If unsure, say N.

  config DEBUG_NOMMU_REGIONS
  	bool "Debug the global anon/private NOMMU mapping region tree"
  	depends on DEBUG_KERNEL && !MMU
  	help
  	  This option causes the global tree of anonymous and private mapping
  	  regions to be regularly checked for invalid topology.

  config DEBUG_WRITECOUNT
  	bool "Debug filesystem writers count"
  	depends on DEBUG_KERNEL
  	help
  	  Enable this to catch wrong use of the writers count in struct
  	  vfsmount.  This will increase the size of each file struct by
  	  32 bits.
  
  	  If unsure, say N.

  config DEBUG_MEMORY_INIT

  	bool "Debug memory initialisation" if EXPERT
  	default !EXPERT

  	help
  	  Enable this for additional checks during memory initialisation.
  	  The sanity checks verify aspects of the VM such as the memory model
  	  and other information provided by the architecture. Verbose
  	  information will be printed at KERN_DEBUG loglevel depending
  	  on the mminit_loglevel= command-line option.
  
  	  If unsure, say Y

  config DEBUG_LIST
  	bool "Debug linked list manipulation"
  	depends on DEBUG_KERNEL
  	help
  	  Enable this to turn on extended checks in the linked-list
  	  walking routines.
  
  	  If unsure, say N.

  config TEST_LIST_SORT
  	bool "Linked list sorting test"
  	depends on DEBUG_KERNEL
  	help
  	  Enable this to turn on 'list_sort()' function test. This test is
  	  executed only once during system boot, so affects only boot time.
  
  	  If unsure, say N.

  config DEBUG_SG
  	bool "Debug SG table operations"
  	depends on DEBUG_KERNEL
  	help
  	  Enable this to turn on checks on scatter-gather tables. This can
  	  help find problems with drivers that do not properly initialize
  	  their sg tables.
  
  	  If unsure, say N.

  config DEBUG_NOTIFIERS
  	bool "Debug notifier call chains"
  	depends on DEBUG_KERNEL
  	help
  	  Enable this to turn on sanity checking for notifier call chains.
  	  This is most useful for kernel developers to make sure that
  	  modules properly unregister themselves from notifier chains.
  	  This is a relatively cheap check but if you care about maximum
  	  performance, say N.

  config DEBUG_CREDENTIALS
  	bool "Debug credential management"
  	depends on DEBUG_KERNEL
  	help
  	  Enable this to turn on some debug checking for credential
  	  management.  The additional code keeps track of the number of
  	  pointers from task_structs to any given cred struct, and checks to
  	  see that this number never exceeds the usage count of the cred
  	  struct.
  
  	  Furthermore, if SELinux is enabled, this also checks that the
  	  security pointer in the cred struct is never seen to be invalid.
  
  	  If unsure, say N.

  #
  # Select this config option from the architecture Kconfig, if it

  # is preferred to always offer frame pointers as a config

  # option on the architecture (regardless of KERNEL_DEBUG):
  #
  config ARCH_WANT_FRAME_POINTERS
  	bool
  	help

  config FRAME_POINTER
  	bool "Compile the kernel with frame pointers"

  	depends on DEBUG_KERNEL && \

  		(CRIS || M68K || FRV || UML || \

  		 AVR32 || SUPERH || BLACKFIN || MN10300) || \
  		ARCH_WANT_FRAME_POINTERS
  	default y if (DEBUG_INFO && UML) || ARCH_WANT_FRAME_POINTERS
  	help
  	  If you say Y here the resulting kernel image will be slightly
  	  larger and slower, but it gives very useful debugging information
  	  in case of kernel bugs. (precise oopses/stacktraces/warnings)

  config BOOT_PRINTK_DELAY
  	bool "Delay each boot printk message by N milliseconds"
  	depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY
  	help
  	  This build option allows you to read kernel boot messages
  	  by inserting a short delay after each one.  The delay is
  	  specified in milliseconds on the kernel command line,
  	  using "boot_delay=N".
  
  	  It is likely that you would also need to use "lpj=M" to preset
  	  the "loops per jiffie" value.
  	  See a previous boot log for the "lpj" value to use for your
  	  system, and then set "lpj=M" before setting "boot_delay=N".
  	  NOTE:  Using this option may adversely affect SMP systems.
  	  I.e., processors other than the first one may not boot up.

  	  BOOT_PRINTK_DELAY also may cause LOCKUP_DETECTOR to detect

  	  what it believes to be lockup conditions.

  config RCU_TORTURE_TEST
  	tristate "torture tests for RCU"
  	depends on DEBUG_KERNEL
  	default n
  	help
  	  This option provides a kernel module that runs torture tests
  	  on the RCU infrastructure.  The kernel module may be built
  	  after the fact on the running kernel to be tested, if desired.

  	  Say Y here if you want RCU torture tests to be built into
  	  the kernel.

  	  Say M if you want the RCU torture tests to build as a module.
  	  Say N if you are unsure.

  config RCU_TORTURE_TEST_RUNNABLE
  	bool "torture tests for RCU runnable by default"
  	depends on RCU_TORTURE_TEST = y
  	default n
  	help
  	  This option provides a way to build the RCU torture tests
  	  directly into the kernel without them starting up at boot
  	  time.  You can use /proc/sys/kernel/rcutorture_runnable
  	  to manually override this setting.  This /proc file is
  	  available only when the RCU torture tests have been built
  	  into the kernel.
  
  	  Say Y here if you want the RCU torture tests to start during
  	  boot (you probably don't).
  	  Say N here if you want the RCU torture tests to start only
  	  after being manually enabled via /proc.

  config RCU_CPU_STALL_TIMEOUT
  	int "RCU CPU stall timeout in seconds"

  	depends on TREE_RCU || TREE_PREEMPT_RCU

  	range 3 300
  	default 60
  	help
  	  If a given RCU grace period extends more than the specified
  	  number of seconds, a CPU stall warning is printed.  If the
  	  RCU grace period persists, additional CPU stall warnings are
  	  printed at more widely spaced intervals.

  config RCU_CPU_STALL_VERBOSE
  	bool "Print additional per-task information for RCU_CPU_STALL_DETECTOR"

  	depends on TREE_PREEMPT_RCU

  	default y

  	help
  	  This option causes RCU to printk detailed per-task information
  	  for any tasks that are stalling the current RCU grace period.

  
  	  Say N if you are unsure.

  	  Say Y if you want to enable such checks.

  config KPROBES_SANITY_TEST
  	bool "Kprobes sanity tests"
  	depends on DEBUG_KERNEL
  	depends on KPROBES
  	default n
  	help
  	  This option provides for testing basic kprobes functionality on
  	  boot. A sample kprobe, jprobe and kretprobe are inserted and
  	  verified for functionality.
  
  	  Say N if you are unsure.

  config BACKTRACE_SELF_TEST
  	tristate "Self test for the backtrace code"
  	depends on DEBUG_KERNEL
  	default n
  	help
  	  This option provides a kernel module that can be used to test
  	  the kernel stack backtrace code. This option is not useful
  	  for distributions or general kernels, but only for kernel
  	  developers working on architecture code.

  	  Note that if you want to also test saved backtraces, you will
  	  have to enable STACKTRACE as well.

  	  Say N if you are unsure.

  config DEBUG_BLOCK_EXT_DEVT
          bool "Force extended block device numbers and spread them"
  	depends on DEBUG_KERNEL
  	depends on BLOCK

  	default n

  	help

  	  BIG FAT WARNING: ENABLING THIS OPTION MIGHT BREAK BOOTING ON
  	  SOME DISTRIBUTIONS.  DO NOT ENABLE THIS UNLESS YOU KNOW WHAT
  	  YOU ARE DOING.  Distros, please enable this and fix whatever
  	  is broken.

  	  Conventionally, block device numbers are allocated from
  	  predetermined contiguous area.  However, extended block area
  	  may introduce non-contiguous block device numbers.  This
  	  option forces most block device numbers to be allocated from
  	  the extended space and spreads them to discover kernel or
  	  userland code paths which assume predetermined contiguous
  	  device number allocation.

  	  Note that turning on this debug option shuffles all the
  	  device numbers for all IDE and SCSI devices including libata
  	  ones, so root partition specified using device number
  	  directly (via rdev or root=MAJ:MIN) won't work anymore.
  	  Textual device names (root=/dev/sdXn) will continue to work.

  	  Say N if you are unsure.

  config DEBUG_FORCE_WEAK_PER_CPU
  	bool "Force weak per-cpu definitions"
  	depends on DEBUG_KERNEL
  	help
  	  s390 and alpha require percpu variables in modules to be
  	  defined weak to work around addressing range issue which
  	  puts the following two restrictions on percpu variable
  	  definitions.
  
  	  1. percpu symbols must be unique whether static or not
  	  2. percpu variables can't be defined inside a function
  
  	  To ensure that generic code follows the above rules, this
  	  option forces all percpu variables to be defined as weak.

  config DEBUG_PER_CPU_MAPS
  	bool "Debug access to per_cpu maps"
  	depends on DEBUG_KERNEL
  	depends on SMP
  	help
  	  Say Y to verify that the per_cpu map being accessed has
  	  been set up. This adds a fair amount of code to kernel memory
  	  and decreases performance.
  
  	  Say N if unsure.

  config LKDTM
  	tristate "Linux Kernel Dump Test Tool Module"

  	depends on DEBUG_FS

  	depends on BLOCK

  	default n
  	help
  	This module enables testing of the different dumping mechanisms by
  	inducing system failures at predefined crash points.
  	If you don't need it: say N
  	Choose M here to compile this code as a module. The module will be
  	called lkdtm.
  
  	Documentation on how to use the module can be found in

  	Documentation/fault-injection/provoke-crashes.txt

  config CPU_NOTIFIER_ERROR_INJECT
  	tristate "CPU notifier error injection module"
  	depends on HOTPLUG_CPU && DEBUG_KERNEL
  	help
  	  This option provides a kernel module that can be used to test
  	  the error handling of the cpu notifiers
  
  	  To compile this code as a module, choose M here: the module will
  	  be called cpu-notifier-error-inject.
  
  	  If unsure, say N.

  config FAULT_INJECTION

  	bool "Fault-injection framework"
  	depends on DEBUG_KERNEL

  	help
  	  Provide fault-injection framework.
  	  For more details, see Documentation/fault-injection/.

  config FAILSLAB

  	bool "Fault-injection capability for kmalloc"
  	depends on FAULT_INJECTION

  	depends on SLAB || SLUB

  	help

  	  Provide fault-injection capability for kmalloc.

  config FAIL_PAGE_ALLOC
  	bool "Fault-injection capabilitiy for alloc_pages()"

  	depends on FAULT_INJECTION

  	help

  	  Provide fault-injection capability for alloc_pages().

  config FAIL_MAKE_REQUEST

  	bool "Fault-injection capability for disk IO"

  	depends on FAULT_INJECTION && BLOCK

  	help

  	  Provide fault-injection capability for disk IO.

  config FAIL_IO_TIMEOUT

  	bool "Fault-injection capability for faking disk interrupts"

  	depends on FAULT_INJECTION && BLOCK
  	help
  	  Provide fault-injection capability on end IO handling. This
  	  will make the block layer "forget" an interrupt as configured,
  	  thus exercising the error handling.
  
  	  Only works with drivers that use the generic timeout handling,
  	  for others it wont do anything.

  config FAIL_MMC_REQUEST
  	bool "Fault-injection capability for MMC IO"
  	select DEBUG_FS
  	depends on FAULT_INJECTION && MMC
  	help
  	  Provide fault-injection capability for MMC IO.
  	  This will make the mmc core return data errors. This is
  	  useful to test the error handling in the mmc block device
  	  and to test how the mmc host driver handles retries from
  	  the block device.

  config FAULT_INJECTION_DEBUG_FS
  	bool "Debugfs entries for fault-injection capabilities"

  	depends on FAULT_INJECTION && SYSFS && DEBUG_FS

  	help

  	  Enable configuration of fault-injection capabilities via debugfs.

  
  config FAULT_INJECTION_STACKTRACE_FILTER
  	bool "stacktrace filter for fault-injection capabilities"
  	depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT

  	depends on !X86_64

  	select STACKTRACE

  	select FRAME_POINTER if !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND

  	help
  	  Provide stacktrace filter for fault-injection capabilities

  config LATENCYTOP
  	bool "Latency measuring infrastructure"

  	depends on HAVE_LATENCYTOP_SUPPORT
  	depends on DEBUG_KERNEL
  	depends on STACKTRACE_SUPPORT
  	depends on PROC_FS

  	select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND

  	select KALLSYMS
  	select KALLSYMS_ALL
  	select STACKTRACE
  	select SCHEDSTATS
  	select SCHED_DEBUG

  	help
  	  Enable this option if you want to use the LatencyTOP tool
  	  to find out which userspace is blocking on what kernel operations.

  config SYSCTL_SYSCALL_CHECK
  	bool "Sysctl checks"

  	depends on SYSCTL

  	---help---
  	  sys_sysctl uses binary paths that have been found challenging
  	  to properly maintain and use. This enables checks that help
  	  you to keep things correct.

  source mm/Kconfig.debug

  source kernel/trace/Kconfig

  config PROVIDE_OHCI1394_DMA_INIT

  	bool "Remote debugging over FireWire early on boot"

  	depends on PCI && X86
  	help
  	  If you want to debug problems which hang or crash the kernel early
  	  on boot and the crashing machine has a FireWire port, you can use
  	  this feature to remotely access the memory of the crashed machine
  	  over FireWire. This employs remote DMA as part of the OHCI1394
  	  specification which is now the standard for FireWire controllers.
  
  	  With remote DMA, you can monitor the printk buffer remotely using
  	  firescope and access all memory below 4GB using fireproxy from gdb.
  	  Even controlling a kernel debugger is possible using remote DMA.
  
  	  Usage:
  
  	  If ohci1394_dma=early is used as boot parameter, it will initialize
  	  all OHCI1394 controllers which are found in the PCI config space.
  
  	  As all changes to the FireWire bus such as enabling and disabling
  	  devices cause a bus reset and thereby disable remote DMA for all
  	  devices, be sure to have the cable plugged and FireWire enabled on
  	  the debugging host before booting the debug target for debugging.
  
  	  This code (~1k) is freed after boot. By then, the firewire stack
  	  in charge of the OHCI-1394 controllers should be used instead.
  
  	  See Documentation/debugging-via-ohci1394.txt for more information.

  config FIREWIRE_OHCI_REMOTE_DMA
  	bool "Remote debugging over FireWire with firewire-ohci"
  	depends on FIREWIRE_OHCI
  	help
  	  This option lets you use the FireWire bus for remote debugging
  	  with help of the firewire-ohci driver. It enables unfiltered
  	  remote DMA in firewire-ohci.
  	  See Documentation/debugging-via-ohci1394.txt for more information.
  
  	  If unsure, say N.

  config BUILD_DOCSRC

  	bool "Build targets in Documentation/ tree"
  	depends on HEADERS_CHECK
  	help
  	  This option attempts to build objects from the source files in the
  	  kernel Documentation/ tree.
  
  	  Say N if you are unsure.

  config DYNAMIC_DEBUG

  	bool "Enable dynamic printk() support"

  	default n
  	depends on PRINTK

  	depends on DEBUG_FS

  	help
  
  	  Compiles debug level messages into the kernel, which would not
  	  otherwise be available at runtime. These messages can then be

  	  enabled/disabled based on various levels of scope - per source file,
  	  function, module, format string, and line number. This mechanism
  	  implicitly enables all pr_debug() and dev_dbg() calls. The impact of
  	  this compile option is a larger kernel text size of about 2%.

  
  	  Usage:

  	  Dynamic debugging is controlled via the 'dynamic_debug/control' file,

  	  which is contained in the 'debugfs' filesystem. Thus, the debugfs
  	  filesystem must first be mounted before making use of this feature.

  	  We refer the control file as: <debugfs>/dynamic_debug/control. This

  	  file contains a list of the debug statements that can be enabled. The
  	  format for each line of the file is:

  		filename:lineno [module]function flags format

  	  filename : source file of the debug statement
  	  lineno : line number of the debug statement
  	  module : module that contains the debug statement
  	  function : function that contains the debug statement
            flags : 'p' means the line is turned 'on' for printing
            format : the format used for the debug statement

  
  	  From a live system:

  		nullarbor:~ # cat <debugfs>/dynamic_debug/control

  		# filename:lineno [module]function flags format
  		fs/aio.c:222 [aio]__put_ioctx - "__put_ioctx:\040freeing\040%p\012"
  		fs/aio.c:248 [aio]ioctx_alloc - "ENOMEM:\040nr_events\040too\040high\012"
  		fs/aio.c:1770 [aio]sys_io_cancel - "calling\040cancel\012"

  	  Example usage:

  		// enable the message at line 1603 of file svcsock.c
  		nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >

  						<debugfs>/dynamic_debug/control

  		// enable all the messages in file svcsock.c
  		nullarbor:~ # echo -n 'file svcsock.c +p' >

  						<debugfs>/dynamic_debug/control

  		// enable all the messages in the NFS server module
  		nullarbor:~ # echo -n 'module nfsd +p' >

  						<debugfs>/dynamic_debug/control

  		// enable all 12 messages in the function svc_process()
  		nullarbor:~ # echo -n 'func svc_process +p' >

  						<debugfs>/dynamic_debug/control

  		// disable all 12 messages in the function svc_process()
  		nullarbor:~ # echo -n 'func svc_process -p' >

  						<debugfs>/dynamic_debug/control

  	  See Documentation/dynamic-debug-howto.txt for additional information.

  config DMA_API_DEBUG
  	bool "Enable debugging of DMA-API usage"
  	depends on HAVE_DMA_API_DEBUG
  	help
  	  Enable this option to debug the use of the DMA API by device drivers.
  	  With this option you will be able to detect common bugs in device
  	  drivers like double-freeing of DMA mappings or freeing mappings that
  	  were never allocated.
  	  This option causes a performance degredation.  Use only if you want
  	  to debug device drivers. If unsure, say N.

  config ATOMIC64_SELFTEST
  	bool "Perform an atomic64_t self-test at boot"
  	help
  	  Enable this option to test the atomic64_t functions at boot.
  
  	  If unsure, say N.

  config ASYNC_RAID6_TEST
  	tristate "Self test for hardware accelerated raid6 recovery"
  	depends on ASYNC_RAID6_RECOV
  	select ASYNC_MEMCPY
  	---help---
  	  This is a one-shot self test that permutes through the
  	  recovery of all the possible two disk failure scenarios for a
  	  N-disk array.  Recovery is performed with the asynchronous
  	  raid6 recovery routines, and will optionally use an offload
  	  engine if one is available.
  
  	  If unsure, say N.

  source "samples/Kconfig"

  
  source "lib/Kconfig.kgdb"

  
  source "lib/Kconfig.kmemcheck"

  
  config TEST_KSTRTOX
  	tristate "Test kstrto*() family of functions at runtime"