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watchdog/hardlockup/perf: Implement CPU enable replacement

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watchdog_nmi_enable() is an unparseable mess, Provide a clean perf specific
implementation, which will be used when the existing setup/teardown mess is
replaced.

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: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Ulrich Obergfell <uobergfe@redhat.com>
Link: http://lkml.kernel.org/r/20170912194148.180215498@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner
2017-09-12 21:37:20 +02:00
committed by Ingo Molnar
parent a994a3147e
commit 2a1b8ee4f5
2 changed files with 13 additions and 0 deletions
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11
kernel/watchdog_hld.c
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@@ -259,6 +259,17 @@ static int hardlockup_detector_event_create(void)
return 0;
}
/**
* hardlockup_detector_perf_enable - Enable the local event
*/
void hardlockup_detector_perf_enable(void)
{
if (hardlockup_detector_event_create())
return;
perf_event_enable(this_cpu_read(watchdog_ev));
}
/**
* hardlockup_detector_perf_disable - Disable the local event
*/