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authorThomas Gleixner <tglx@linutronix.de>2016-12-15 11:44:28 +0100
committerIngo Molnar <mingo@kernel.org>2017-01-14 11:29:43 +0100
commit12907fbb1a691807bb0420a27126e15934cb7954 (patch)
tree14ba1797a6e24d566513b368c59b13948130dc40 /kernel/time
parentcb42c9a3ebbbb23448c3f9a25417fae6309b1a92 (diff)
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sched/clock, clocksource: Add optional cs::mark_unstable() method
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>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/clocksource.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 665985b0a89a..93621ae718d3 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -141,6 +141,10 @@ static void __clocksource_unstable(struct clocksource *cs)
{
cs->flags &= ~(CLOCK_SOURCE_VALID_FOR_HRES | CLOCK_SOURCE_WATCHDOG);
cs->flags |= CLOCK_SOURCE_UNSTABLE;
+
+ if (cs->mark_unstable)
+ cs->mark_unstable(cs);
+
if (finished_booting)
schedule_work(&watchdog_work);
}