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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-08-14 17:47:23 +0400 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2009-08-15 12:55:46 +0400 |
| commit | 0f8e8ef7c204988246da5a42d576b7fa5277a8e4 (patch) | |
| tree | 390bcd20b76bfa331e029c731ade1b6263e14684 /kernel/time/clocksource.c | |
| parent | 8cf4e750f8459d51c2e8a035a201da4bf7aa996a (diff) | |
| download | linux-0f8e8ef7c204988246da5a42d576b7fa5277a8e4.tar.xz | |
clocksource: Simplify clocksource watchdog resume logic
To resume the clocksource watchdog just remove the CLOCK_SOURCE_WATCHDOG
bit from the watched clocksource.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: John Stultz <johnstul@us.ibm.com>
Cc: Daniel Walker <dwalker@fifo99.com>
LKML-Reference: <20090814134808.880925790@de.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/time/clocksource.c')
| -rw-r--r-- | kernel/time/clocksource.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index 76256c5aecb8..89a7b91bfbdd 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -145,7 +145,6 @@ static struct clocksource *watchdog; static struct timer_list watchdog_timer; static DEFINE_SPINLOCK(watchdog_lock); static cycle_t watchdog_last; -static unsigned long watchdog_resumed; /* * Interval: 0.5sec Threshold: 0.0625s @@ -167,12 +166,9 @@ static void clocksource_watchdog(unsigned long data) struct clocksource *cs, *tmp; cycle_t csnow, wdnow; int64_t wd_nsec, cs_nsec; - int resumed; spin_lock(&watchdog_lock); - resumed = test_and_clear_bit(0, &watchdog_resumed); - wdnow = watchdog->read(watchdog); wd_nsec = cyc2ns(watchdog, (wdnow - watchdog_last) & watchdog->mask); watchdog_last = wdnow; @@ -223,14 +219,26 @@ static void clocksource_watchdog(unsigned long data) } spin_unlock(&watchdog_lock); } + +static inline void clocksource_reset_watchdog(void) +{ + struct clocksource *cs; + + list_for_each_entry(cs, &watchdog_list, wd_list) + cs->flags &= ~CLOCK_SOURCE_WATCHDOG; +} + static void clocksource_resume_watchdog(void) { - set_bit(0, &watchdog_resumed); + unsigned long flags; + + spin_lock_irqsave(&watchdog_lock, flags); + clocksource_reset_watchdog(); + spin_unlock_irqrestore(&watchdog_lock, flags); } static void clocksource_check_watchdog(struct clocksource *cs) { - struct clocksource *cse; unsigned long flags; spin_lock_irqsave(&watchdog_lock, flags); @@ -256,8 +264,7 @@ static void clocksource_check_watchdog(struct clocksource *cs) watchdog_timer.function = clocksource_watchdog; /* Reset watchdog cycles */ - list_for_each_entry(cse, &watchdog_list, wd_list) - cse->flags &= ~CLOCK_SOURCE_WATCHDOG; + clocksource_reset_watchdog(); /* Start if list is not empty */ if (!list_empty(&watchdog_list)) { watchdog_last = watchdog->read(watchdog); |