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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>
This commit is contained in:
Martin Schwidefsky 2009-08-14 15:47:23 +02:00 committed by Thomas Gleixner
parent 8cf4e750f8
commit 0f8e8ef7c2
1 changed files with 15 additions and 8 deletions
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23
kernel/time/clocksource.c
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@ -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);