1 files changed, 43 insertions, 20 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index e722e9d62221..79e0dff1cdcb 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -76,7 +76,6 @@ config UNUSED_SYMBOLS
 
 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
@@ -152,28 +151,33 @@ config DEBUG_SHIRQ
           Drivers ought to be able to handle interrupts coming in at those
           points; some don't and need to be caught.
 
-config DETECT_SOFTLOCKUP
-        bool "Detect Soft Lockups"
+config LOCKUP_DETECTOR
+        bool "Detect Hard and Soft Lockups"
         depends on DEBUG_KERNEL && !S390
-        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
+          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.
+          chance to run.  The current stack trace is displayed upon
+          detection and the system will stay locked up.
 
-          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.
+          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.
 
-          (Note that "hard lockups" are separate type of bugs that
-           can be detected via the NMI-watchdog, on platforms that
-           support it.)
+          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
 
 config BOOTPARAM_SOFTLOCKUP_PANIC
         bool "Panic (Reboot) On Soft Lockups"
-        depends on DETECT_SOFTLOCKUP
+        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
@@ -190,7 +194,7 @@ config BOOTPARAM_SOFTLOCKUP_PANIC
 
 config BOOTPARAM_SOFTLOCKUP_PANIC_VALUE
         int
-        depends on DETECT_SOFTLOCKUP
+        depends on LOCKUP_DETECTOR
         range 0 1
         default 0 if !BOOTPARAM_SOFTLOCKUP_PANIC
         default 1 if BOOTPARAM_SOFTLOCKUP_PANIC
@@ -307,6 +311,12 @@ config DEBUG_OBJECTS_WORK
           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 && PREEMPT
+        help
+          Enable this to turn on debugging of RCU list heads (call_rcu() usage).
+
 config DEBUG_OBJECTS_ENABLE_DEFAULT
         int "debug_objects bootup default value (0-1)"
         range 0 1
@@ -528,7 +538,7 @@ 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
+        select FRAME_POINTER if !MIPS && !PPC && !ARM_UNWIND && !S390 && !MICROBLAZE
         select KALLSYMS
         select KALLSYMS_ALL
 
@@ -628,6 +638,19 @@ config DEBUG_INFO
 
           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
@@ -937,7 +960,7 @@ config FAIL_MAKE_REQUEST
           Provide fault-injection capability for disk IO.
 
 config FAIL_IO_TIMEOUT
-        bool "Faul-injection capability for faking disk interrupts"
+        bool "Fault-injection capability for faking disk interrupts"
         depends on FAULT_INJECTION && BLOCK
         help
           Provide fault-injection capability on end IO handling. This
@@ -958,13 +981,13 @@ config FAULT_INJECTION_STACKTRACE_FILTER
         depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
         depends on !X86_64
         select STACKTRACE
-        select FRAME_POINTER if !PPC && !S390
+        select FRAME_POINTER if !PPC && !S390 && !MICROBLAZE
         help
           Provide stacktrace filter for fault-injection capabilities
 
 config LATENCYTOP
         bool "Latency measuring infrastructure"
-        select FRAME_POINTER if !MIPS && !PPC && !S390
+        select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE
         select KALLSYMS
         select KALLSYMS_ALL
         select STACKTRACE