rb_tree: remove redundant if()-condition in rb_erase()

[safe/jmp/linux-2.6] / lib / Kconfig.debug

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index d0a32aa..116a350 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -186,6 +186,44 @@ config BOOTPARAM_SOFTLOCKUP_PANIC_VALUE
        default 0 if !BOOTPARAM_SOFTLOCKUP_PANIC
        default 1 if BOOTPARAM_SOFTLOCKUP_PANIC
 
        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 DETECT_SOFTLOCKUP
+       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 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
 config SCHED_DEBUG
        bool "Collect scheduler debugging info"
        depends on DEBUG_KERNEL && PROC_FS


@@ -298,6 +336,38 @@ config SLUB_STATS
          out which slabs are relevant to a particular load.
          Try running: slabinfo -DA
 
          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) && \
+               !MEMORY_HOTPLUG
+       select DEBUG_SLAB if SLAB
+       select SLUB_DEBUG if SLUB
+       select DEBUG_FS if SYSFS
+       select STACKTRACE if STACKTRACE_SUPPORT
+       select KALLSYMS
+       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.
+
+         In order to access the kmemleak file, debugfs needs to be
+         mounted (usually at /sys/kernel/debug).
+
+config DEBUG_KMEMLEAK_TEST
+       tristate "Simple test for the kernel memory leak detector"
+       depends on DEBUG_KMEMLEAK
+       help
+         Say Y or M here to build a test for the kernel memory leak
+         detector. This option enables a module that explicitly leaks
+         memory.
+
+         If unsure, say N.
+

 config DEBUG_PREEMPT
        bool "Debug preemptible kernel"
        depends on DEBUG_KERNEL && PREEMPT && (TRACE_IRQFLAGS_SUPPORT || PPC64)
 config DEBUG_PREEMPT
        bool "Debug preemptible kernel"
        depends on DEBUG_KERNEL && PREEMPT && (TRACE_IRQFLAGS_SUPPORT || PPC64)


@@ -402,7 +472,7 @@ config LOCKDEP
        bool
        depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
        select STACKTRACE
        bool
        depends on DEBUG_KERNEL && TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
        select STACKTRACE

-       select FRAME_POINTER if !X86 && !MIPS && !PPC
+       select FRAME_POINTER if !X86 && !MIPS && !PPC && !ARM_UNWIND && !S390

        select KALLSYMS
        select KALLSYMS_ALL
 
        select KALLSYMS
        select KALLSYMS_ALL
 


@@ -570,17 +640,26 @@ config DEBUG_NOTIFIERS
          This is a relatively cheap check but if you care about maximum
          performance, say N.
 
          This is a relatively cheap check but if you care about maximum
          performance, say N.
 

+#
+# Select this config option from the architecture Kconfig, if it
+# 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 && \
 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
+               (CRIS || M68K || M68KNOMMU || FRV || UML || \
+                AVR32 || SUPERH || BLACKFIN || MN10300) || \
+               ARCH_WANT_FRAME_POINTERS
+       default y if (DEBUG_INFO && UML) || ARCH_WANT_FRAME_POINTERS

        help
        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.
+         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"
 
 config BOOT_PRINTK_DELAY
        bool "Delay each boot printk message by N milliseconds"


@@ -633,19 +712,6 @@ config RCU_TORTURE_TEST_RUNNABLE
 
 config RCU_CPU_STALL_DETECTOR
        bool "Check for stalled CPUs delaying RCU grace periods"
 
 config RCU_CPU_STALL_DETECTOR
        bool "Check for stalled CPUs delaying RCU grace periods"

-       depends on CLASSIC_RCU
-       default n
-       help
-         This option causes RCU to printk information on which
-         CPUs are delaying the current grace period, but only when
-         the grace period extends for excessive time periods.
-
-         Say Y if you want RCU to perform such checks.
-
-         Say N if you are unsure.
-
-config RCU_CPU_STALL_DETECTOR
-       bool "Check for stalled CPUs delaying RCU grace periods"

        depends on CLASSIC_RCU || TREE_RCU
        default n
        help
        depends on CLASSIC_RCU || TREE_RCU
        default n
        help


@@ -775,13 +841,13 @@ config FAULT_INJECTION_STACKTRACE_FILTER
        depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
        depends on !X86_64
        select STACKTRACE
        depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
        depends on !X86_64
        select STACKTRACE

-       select FRAME_POINTER if !PPC
+       select FRAME_POINTER if !PPC && !S390

        help
          Provide stacktrace filter for fault-injection capabilities
 
 config LATENCYTOP
        bool "Latency measuring infrastructure"
        help
          Provide stacktrace filter for fault-injection capabilities
 
 config LATENCYTOP
        bool "Latency measuring infrastructure"

-       select FRAME_POINTER if !MIPS && !PPC
+       select FRAME_POINTER if !MIPS && !PPC && !S390

        select KALLSYMS
        select KALLSYMS_ALL
        select STACKTRACE
        select KALLSYMS
        select KALLSYMS_ALL
        select STACKTRACE


@@ -800,6 +866,7 @@ config SYSCTL_SYSCALL_CHECK
          to properly maintain and use. This enables checks that help
          you to keep things correct.
 
          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
 source kernel/trace/Kconfig
 
 config PROVIDE_OHCI1394_DMA_INIT


@@ -842,7 +909,7 @@ config FIREWIRE_OHCI_REMOTE_DMA
 
          If unsure, say N.
 
 
          If unsure, say N.
 

-menuconfig BUILD_DOCSRC
+config BUILD_DOCSRC

        bool "Build targets in Documentation/ tree"
        depends on HEADERS_CHECK
        help
        bool "Build targets in Documentation/ tree"
        depends on HEADERS_CHECK
        help


@@ -851,60 +918,80 @@ menuconfig BUILD_DOCSRC
 
          Say N if you are unsure.
 
 
          Say N if you are unsure.
 

-config DYNAMIC_PRINTK_DEBUG
-       bool "Enable dynamic printk() call support"
+config DYNAMIC_DEBUG
+       bool "Enable dynamic printk() support"

        default n
        depends on PRINTK
        default n
        depends on PRINTK

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

-         enabled/disabled on a per module basis. 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%.
+         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:
 
 
          Usage:
 

-         Dynamic debugging is controlled by the debugfs file,
-         dynamic_printk/modules. This file contains a list of the modules that
-         can be enabled. The format of the file is the module name, followed
-         by a set of flags that can be enabled. The first flag is always the
-         'enabled' flag. For example:
+         Dynamic debugging is controlled via the 'dynamic_debug/ddebug' 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/ddebug. This
+         file contains a list of the debug statements that can be enabled. The
+         format for each line of the file is:

 
 

-               <module_name> <enabled=0/1>
-                               .
-                               .
-                               .
+               filename:lineno [module]function flags format

 
 

-         <module_name> : Name of the module in which the debug call resides
-         <enabled=0/1> : whether the messages are enabled or not
+         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:
 
 
          From a live system:
 

-               snd_hda_intel enabled=0
-               fixup enabled=0
-               driver enabled=0
+               nullarbor:~ # cat <debugfs>/dynamic_debug/ddebug
+               # 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"

 
 

-         Enable a module:
+         Example usage:

 
 

-               $echo "set enabled=1 <module_name>" > dynamic_printk/modules
+               // enable the message at line 1603 of file svcsock.c
+               nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
+                                               <debugfs>/dynamic_debug/ddebug

 
 

-         Disable a module:
+               // enable all the messages in file svcsock.c
+               nullarbor:~ # echo -n 'file svcsock.c +p' >
+                                               <debugfs>/dynamic_debug/ddebug

 
 

-               $echo "set enabled=0 <module_name>" > dynamic_printk/modules
+               // enable all the messages in the NFS server module
+               nullarbor:~ # echo -n 'module nfsd +p' >
+                                               <debugfs>/dynamic_debug/ddebug

 
 

-         Enable all modules:
+               // enable all 12 messages in the function svc_process()
+               nullarbor:~ # echo -n 'func svc_process +p' >
+                                               <debugfs>/dynamic_debug/ddebug

 
 

-               $echo "set enabled=1 all" > dynamic_printk/modules
+               // disable all 12 messages in the function svc_process()
+               nullarbor:~ # echo -n 'func svc_process -p' >
+                                               <debugfs>/dynamic_debug/ddebug

 
 

-         Disable all modules:
+         See Documentation/dynamic-debug-howto.txt for additional information.

 
 

-               $echo "set enabled=0 all" > dynamic_printk/modules
-
-         Finally, passing "dynamic_printk" at the command line enables
-         debugging for all modules. This mode can be turned off via the above
-         disable command.
+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.

 
 source "samples/Kconfig"
 
 
 source "samples/Kconfig"