Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (162 commits)
  tracing/kprobes: unregister_trace_probe needs to be called under mutex
  perf: expose event__process function
  perf events: Fix mmap offset determination
  perf, powerpc: fsl_emb: Restore setting perf_sample_data.period
  perf, powerpc: Convert the FSL driver to use local64_t
  perf tools: Don't keep unreferenced maps when unmaps are detected
  perf session: Invalidate last_match when removing threads from rb_tree
  perf session: Free the ref_reloc_sym memory at the right place
  x86,mmiotrace: Add support for tracing STOS instruction
  perf, sched migration: Librarize task states and event headers helpers
  perf, sched migration: Librarize the GUI class
  perf, sched migration: Make the GUI class client agnostic
  perf, sched migration: Make it vertically scrollable
  perf, sched migration: Parameterize cpu height and spacing
  perf, sched migration: Fix key bindings
  perf, sched migration: Ignore unhandled task states
  perf, sched migration: Handle ignored migrate out events
  perf: New migration tool overview
  tracing: Drop cpparg() macro
  perf: Use tracepoint_synchronize_unregister() to flush any pending tracepoint call
  ...

Fix up trivial conflicts in Makefile and drivers/cpufreq/cpufreq.c

1 files changed, 20 insertions, 15 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index e80d6bf1c43d..ff87ddc4cbd5 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -152,28 +152,33 @@ 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.
+
+          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.
 
-          (Note that "hard lockups" are separate type of bugs that
-           can be detected via the NMI-watchdog, on platforms that
-           support it.)
+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 +195,7 @@ 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