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| author |   Peter Zijlstra <peterz@infradead.org> | 2017-09-12 21:36:55 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2017-09-14 11:41:03 +0200 |
| commit | d0b6e0a8ef24b1b07078ababe5d91bcdf4f4264a (patch) | |
| tree | 9ffb417f5f94d319352b8e54f94165b82c645762 /include/linux/nmi.h | |
| parent | Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (diff) | |
| download | linux-dev-d0b6e0a8ef24b1b07078ababe5d91bcdf4f4264a.tar.xz linux-dev-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/linux/nmi.h')
| -rw-r--r-- | include/linux/nmi.h | 4 |
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 |