1 files changed, 95 insertions, 35 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1bcf9cd4baa0..812c28207baf 100644
--- 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
 
+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
@@ -402,7 +440,7 @@ config LOCKDEP
         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
 
@@ -582,7 +620,7 @@ config ARCH_WANT_FRAME_POINTERS
 config FRAME_POINTER
         bool "Compile the kernel with frame pointers"
         depends on DEBUG_KERNEL && \
-                (CRIS || M68K || M68KNOMMU || FRV || UML || S390 || \
+                (CRIS || M68K || M68KNOMMU || FRV || UML || \
                  AVR32 || SUPERH || BLACKFIN || MN10300) || \
                 ARCH_WANT_FRAME_POINTERS
         default y if (DEBUG_INFO && UML) || ARCH_WANT_FRAME_POINTERS
@@ -771,13 +809,13 @@ config FAULT_INJECTION_STACKTRACE_FILTER
         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"
-        select FRAME_POINTER if !MIPS && !PPC
+        select FRAME_POINTER if !MIPS && !PPC && !S390
         select KALLSYMS
         select KALLSYMS_ALL
         select STACKTRACE
@@ -796,6 +834,7 @@ config SYSCTL_SYSCALL_CHECK
           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
@@ -847,60 +886,81 @@ config BUILD_DOCSRC
 
           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
+        depends on DEBUG_FS
         select PRINTK_DEBUG
         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:
 
-          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:
 
-                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"