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clocksource: add unregister function to disable unusable clocksources

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On x86 the PIT might become an unusable clocksource. Add an unregister
function to provide a possibilty to remove the PIT from the list of
available clock sources.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner
2008-01-30 13:30:02 +01:00
committed by Ingo Molnar
parent 316da3b3fc
commit 4713e22ce8
3 changed files with 17 additions and 0 deletions
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15
kernel/time/clocksource.c
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@ -337,6 +337,21 @@ void clocksource_change_rating(struct clocksource *cs, int rating)
spin_unlock_irqrestore(&clocksource_lock, flags);
}
/**
* clocksource_unregister - remove a registered clocksource
*/
void clocksource_unregister(struct clocksource *cs)
{
unsigned long flags;
spin_lock_irqsave(&clocksource_lock, flags);
list_del(&cs->list);
if (clocksource_override == cs)
clocksource_override = NULL;
next_clocksource = select_clocksource();
spin_unlock_irqrestore(&clocksource_lock, flags);
}
#ifdef CONFIG_SYSFS
/**
* sysfs_show_current_clocksources - sysfs interface for current clocksource