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[PATCH] clocksource: Fix thinko in watchdog selection 

The watchdog implementation excludes low res / non continuous
clocksources from being selected as a watchdog reference
unintentionally.

Allow using jiffies/PIT as a watchdog reference as long as no better
clocksource is available. This is necessary to detect TSC breakage on
systems, which have no pmtimer/hpet.

The main goal of the initial patch (preventing to switch to highres/nohz
when no reliable fallback clocksource is available) is still guaranteed
by the checks in clocksource_watchdog().

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Thomas Gleixner 2007-03-25 14:42:51 +02:00 committed by Linus Torvalds
parent 9501b6cf55
commit 948ac6d71c
1 changed files with 2 additions and 1 deletions
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3
kernel/time/clocksource.c
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@ -151,7 +151,8 @@ static void clocksource_check_watchdog(struct clocksource *cs)
watchdog_timer.expires = jiffies + WATCHDOG_INTERVAL;
add_timer(&watchdog_timer);
}
} else if (cs->flags & CLOCK_SOURCE_IS_CONTINUOUS) {
} else {
if (cs->flags & CLOCK_SOURCE_IS_CONTINUOUS)
cs->flags |= CLOCK_SOURCE_VALID_FOR_HRES;
if (!watchdog || cs->rating > watchdog->rating) {