sched/clock, clocksource: Add optional cs::mark_unstable() method

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PeterZ reported that we'd fail to mark the TSC unstable when the
clocksource watchdog finds it unsuitable.

Allow a clocksource to run a custom action when its being marked
unstable and hook up the TSC unstable code.

Reported-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

...

This commit is contained in:

Thomas Gleixner 2016-12-15 11:44:28 +01:00 • committed by Ingo Molnar

parent cb42c9a3eb

commit 12907fbb1a

3 changed files with 18 additions and 0 deletions

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11

arch/x86/kernel/tsc.c

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3

include/linux/clocksource.h

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4

kernel/time/clocksource.c

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