kconfig.debug

Lib files of linux kernel

	 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
	depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
	select STACKTRACE
	select FRAME_POINTER if !X86 && !MIPS && !PPC
	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

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
	depends on DEBUG_KERNEL
	bool
	default y
	depends on TRACE_IRQFLAGS_SUPPORT
	depends on PROVE_LOCKING

config DEBUG_SPINLOCK_SLEEP
	bool "Spinlock debugging: sleep-inside-spinlock checking"
	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.

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_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
	depends on BUG
	depends on ARM || AVR32 || M32R || M68K || SPARC32 || SPARC64 || \
		   FRV || SUPERH || GENERIC_BUG || BLACKFIN || MN10300
	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.
	  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_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_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 EMBEDDED
	default !EMBEDDED
	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 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 FRAME_POINTER
	bool "Compile the kernel with frame pointers"
	depends on DEBUG_KERNEL && \
		(X86 || CRIS || M68K || M68KNOMMU || FRV || UML || S390 || \
		 AVR32 || SUPERH || BLACKFIN || MN10300)
	default y if DEBUG_INFO && UML
	help
	  If you say Y here the resulting kernel image will be slightly larger
	  and slower, but it might give very useful debugging information on
	  some architectures or if you use external debuggers.
	  If you don't debug the kernel, you can say N.

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.

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 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 LKDTM
	tristate "Linux Kernel Dump Test Tool Module"
	depends on DEBUG_KERNEL
	depends on KPROBES
	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
	drivers/misc/lkdtm.c

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
	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
	help
	  Provide fault-injection capability for disk IO.

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
	help
	  Provide stacktrace filter for fault-injection capabilities

config LATENCYTOP
	bool "Latency measuring infrastructure"
	select FRAME_POINTER if !MIPS && !PPC
	select KALLSYMS
	select KALLSYMS_ALL
	select STACKTRACE
	select SCHEDSTATS
	select SCHED_DEBUG
	depends on HAVE_LATENCYTOP_SUPPORT
	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_SYSCALL
	---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 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.

menuconfig 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.

source "samples/Kconfig"

source "lib/Kconfig.kgdb"