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lib/Kconfig.debug 23.5 KB
1da177e4c   Linus Torvalds   Linux-2.6.12-rc2
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  config PRINTK_TIME
  	bool "Show timing information on printks"
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  	depends on PRINTK
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  	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.
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  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.
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  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.
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  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
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  config MAGIC_SYSRQ
  	bool "Magic SysRq key"
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  	depends on !UML
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  	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.
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  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.
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  config DEBUG_FS
  	bool "Debug Filesystem"
  	depends on SYSFS
  	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.
  
  	  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.
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  config DEBUG_SECTION_MISMATCH
  	bool "Enable full Section mismatch analysis"
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  	depends on UNDEFINED
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  	# This option is on purpose disabled for now.
  	# It will be enabled when we are down to a resonable number
  	# of section mismatch warnings (< 10 for an allyesconfig build)
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  	help
  	  The section mismatch analysis checks if there are illegal
  	  references from one section to another section.
  	  Linux will during link or during runtime drop some sections
  	  and any use of code/data previously in these sections will
  	  most likely result in an oops.
  	  In the code functions and variables are annotated with
  	  __init, __devinit etc. (see full list in include/linux/init.h)
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  	  which results in the code/data being placed in specific sections.
  	  The section mismatch analysis is always done after a full
  	  kernel build but enabling this option will in addition
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  	  do the following:
  	  - Add the option -fno-inline-functions-called-once to gcc
  	    When inlining a function annotated __init in a non-init
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  	    function we would lose the section information and thus
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  	    the analysis would not catch the illegal reference.
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  	    This option tells gcc to inline less but will also
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  	    result in a larger kernel.
  	  - Run the section mismatch analysis for each module/built-in.o
  	    When we run the section mismatch analysis on vmlinux.o we
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  	    lose valueble information about where the mismatch was
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  	    introduced.
  	    Running the analysis for each module/built-in.o file
  	    will tell where the mismatch happens much closer to the
  	    source. The drawback is that we will report the same
  	    mismatch at least twice.
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  	  - Enable verbose reporting from modpost to help solving
  	    the section mismatches reported.
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  config DEBUG_KERNEL
  	bool "Kernel debugging"
  	help
  	  Say Y here if you are developing drivers or trying to debug and
  	  identify kernel problems.
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  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.
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  config DETECT_SOFTLOCKUP
  	bool "Detect Soft Lockups"
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  	depends on DEBUG_KERNEL && !S390
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  	default y
  	help
  	  Say Y here to enable the kernel to detect "soft lockups",
  	  which are bugs that cause the kernel to loop in kernel
  	  mode for more than 10 seconds, without giving other tasks a
  	  chance to run.
  
  	  When a soft-lockup is detected, the kernel will print the
  	  current stack trace (which you should report), but the
  	  system will stay locked up. This feature has negligible
  	  overhead.
  
  	  (Note that "hard lockups" are separate type of bugs that
  	   can be detected via the NMI-watchdog, on platforms that
  	   support it.)
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  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.
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  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.
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  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
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  	  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).
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  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.
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  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.
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  config DEBUG_SLAB
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  	bool "Debug slab memory allocations"
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  	depends on DEBUG_KERNEL && SLAB
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  	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.
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  config DEBUG_SLAB_LEAK
  	bool "Memory leak debugging"
  	depends on DEBUG_SLAB
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  config SLUB_DEBUG_ON
  	bool "SLUB debugging on by default"
  	depends on SLUB && SLUB_DEBUG
  	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=-".
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  config SLUB_STATS
  	default n
  	bool "Enable SLUB performance statistics"
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  	depends on SLUB && SLUB_DEBUG && SYSFS
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  	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
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  config DEBUG_PREEMPT
  	bool "Debug preemptible kernel"
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  	depends on DEBUG_KERNEL && PREEMPT && (TRACE_IRQFLAGS_SUPPORT || PPC64)
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  	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.
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  config DEBUG_RT_MUTEXES
  	bool "RT Mutex debugging, deadlock detection"
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  	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
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  config RT_MUTEX_TESTER
  	bool "Built-in scriptable tester for rt-mutexes"
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  	depends on DEBUG_KERNEL && RT_MUTEXES
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  	help
  	  This option enables a rt-mutex tester.
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  config DEBUG_SPINLOCK
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  	bool "Spinlock and rw-lock debugging: basic checks"
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  	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.
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  config DEBUG_MUTEXES
  	bool "Mutex debugging: basic checks"
  	depends on DEBUG_KERNEL
  	help
  	 This feature allows mutex semantics violations to be detected and
  	 reported.
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  config DEBUG_LOCK_ALLOC
  	bool "Lock debugging: detect incorrect freeing of live locks"
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  	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
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  	select DEBUG_SPINLOCK
  	select DEBUG_MUTEXES
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  	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"
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  	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
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  	select LOCKDEP
  	select DEBUG_SPINLOCK
  	select DEBUG_MUTEXES
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  	select DEBUG_LOCK_ALLOC
  	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 LOCKDEP
  	bool
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  	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
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  	select STACKTRACE
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  	select FRAME_POINTER if !X86 && !MIPS
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  	select KALLSYMS
  	select KALLSYMS_ALL
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  config LOCK_STAT
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  	bool "Lock usage statistics"
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  	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
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  	 For more details, see Documentation/lockstat.txt
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  config DEBUG_LOCKDEP
  	bool "Lock dependency engine debugging"
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  	depends on DEBUG_KERNEL && LOCKDEP
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  	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
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  	depends on DEBUG_KERNEL
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  	bool
  	default y
  	depends on TRACE_IRQFLAGS_SUPPORT
  	depends on PROVE_LOCKING
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  config DEBUG_SPINLOCK_SLEEP
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  	bool "Spinlock debugging: sleep-inside-spinlock checking"
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  	depends on DEBUG_KERNEL
  	help
  	  If you say Y here, various routines which may sleep will become very
  	  noisy if they are called with a spinlock held.
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  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.
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  config STACKTRACE
  	bool
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  	depends on DEBUG_KERNEL
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  	depends on STACKTRACE_SUPPORT
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  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 && EMBEDDED
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  	depends on BUG
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  	depends on ARM || AVR32 || M32R || M68K || SPARC32 || SPARC64 || \
  		   FRV || SUPERH || GENERIC_BUG || BLACKFIN || MN10300
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  	default !EMBEDDED
  	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.
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  	  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.
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  	  Say Y here only if you plan to debug the kernel.
  
  	  If unsure, say N.
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  config DEBUG_VM
  	bool "Debug VM"
  	depends on DEBUG_KERNEL
  	help
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  	  Enable this to turn on extended checks in the virtual-memory system
            that may impact performance.
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  	  If unsure, say N.
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  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.
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  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.
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  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.
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  config FRAME_POINTER
  	bool "Compile the kernel with frame pointers"
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  	depends on DEBUG_KERNEL && \
  		(X86 || CRIS || M68K || M68KNOMMU || FRV || UML || S390 || \
  		 AVR32 || SUPERH || BLACKFIN || MN10300)
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  	default y if DEBUG_INFO && UML
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  	help
  	  If you say Y here the resulting kernel image will be slightly larger
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  	  and slower, but it might give very useful debugging information on
  	  some architectures or if you use external debuggers.
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  	  If you don't debug the kernel, you can say N.
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  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 DETECT_SOFTLOCKUP to detect
  	  what it believes to be lockup conditions.
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  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.
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  	  Say Y here if you want RCU torture tests to start automatically
  	  at boot time (you probably don't).
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  	  Say M if you want the RCU torture tests to build as a module.
  	  Say N if you are unsure.
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  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.
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  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.
  
  	  Say N if you are unsure.
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  config LKDTM
  	tristate "Linux Kernel Dump Test Tool Module"
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  	depends on DEBUG_KERNEL
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  	depends on KPROBES
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  	depends on BLOCK
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  	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
  	drivers/misc/lkdtm.c
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  config FAULT_INJECTION
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  	bool "Fault-injection framework"
  	depends on DEBUG_KERNEL
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  	help
  	  Provide fault-injection framework.
  	  For more details, see Documentation/fault-injection/.
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  config FAILSLAB
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  	bool "Fault-injection capability for kmalloc"
  	depends on FAULT_INJECTION
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  	help
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  	  Provide fault-injection capability for kmalloc.
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  config FAIL_PAGE_ALLOC
  	bool "Fault-injection capabilitiy for alloc_pages()"
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  	depends on FAULT_INJECTION
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  	help
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  	  Provide fault-injection capability for alloc_pages().
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  config FAIL_MAKE_REQUEST
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  	bool "Fault-injection capability for disk IO"
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  	depends on FAULT_INJECTION
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  	help
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  	  Provide fault-injection capability for disk IO.
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  config FAULT_INJECTION_DEBUG_FS
  	bool "Debugfs entries for fault-injection capabilities"
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  	depends on FAULT_INJECTION && SYSFS && DEBUG_FS
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  	help
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  	  Enable configuration of fault-injection capabilities via debugfs.
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  config FAULT_INJECTION_STACKTRACE_FILTER
  	bool "stacktrace filter for fault-injection capabilities"
  	depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
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  	depends on !X86_64
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  	select STACKTRACE
  	select FRAME_POINTER
  	help
  	  Provide stacktrace filter for fault-injection capabilities
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  config LATENCYTOP
  	bool "Latency measuring infrastructure"
  	select FRAME_POINTER if !MIPS
  	select KALLSYMS
  	select KALLSYMS_ALL
  	select STACKTRACE
  	select SCHEDSTATS
  	select SCHED_DEBUG
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  	depends on HAVE_LATENCYTOP_SUPPORT
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  	help
  	  Enable this option if you want to use the LatencyTOP tool
  	  to find out which userspace is blocking on what kernel operations.
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  config PROVIDE_OHCI1394_DMA_INIT
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  	bool "Remote debugging over FireWire early on boot"
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  	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.
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  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.
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  source "samples/Kconfig"
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  source "lib/Kconfig.kgdb"