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authorPeter Zijlstra <peterz@infradead.org>2017-09-12 21:36:55 +0200
committerIngo Molnar <mingo@kernel.org>2017-09-14 11:41:03 +0200
commitd0b6e0a8ef24b1b07078ababe5d91bcdf4f4264a (patch)
tree9ffb417f5f94d319352b8e54f94165b82c645762 /include
parentMerge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/ke... (diff)
downloadlinux-d0b6e0a8ef24b1b07078ababe5d91bcdf4f4264a.tar.xz
linux-d0b6e0a8ef24b1b07078ababe5d91bcdf4f4264a.zip
watchdog/hardlockup: Provide interface to stop/restart perf events
Provide an interface to stop and restart perf NMI watchdog events on all CPUs. This is only usable during init and especially for handling the perf HT bug on Intel machines. It's safe to use it this way as nothing can start/stop the NMI watchdog in parallel. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Don Zickus <dzickus@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Chris Metcalf <cmetcalf@mellanox.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Ulrich Obergfell <uobergfe@redhat.com> Link: http://lkml.kernel.org/r/20170912194146.167649596@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/nmi.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/nmi.h b/include/linux/nmi.h
index a36abe2da13e..b24d4a58674a 100644
--- a/include/linux/nmi.h
+++ b/include/linux/nmi.h
@@ -75,7 +75,11 @@ static inline void hardlockup_detector_disable(void) {}
#if defined(CONFIG_HARDLOCKUP_DETECTOR_PERF)
extern void arch_touch_nmi_watchdog(void);
+extern void hardlockup_detector_perf_stop(void);
+extern void hardlockup_detector_perf_restart(void);
#else
+static inline void hardlockup_detector_perf_stop(void) { }
+static inline void hardlockup_detector_perf_restart(void) { }
#if !defined(CONFIG_HAVE_NMI_WATCHDOG)
static inline void arch_touch_nmi_watchdog(void) {}
#endif