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authorThomas Gleixner <tglx@linutronix.de>2008-01-30 13:30:02 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:30:02 +0100
commit4713e22ce81eb8b3353e16435362eb3d0ec95640 (patch)
tree6f96151bd9b182d6b9d706d3ad3b4fe8c99e7f7e /kernel/time
parent316da3b3fc8efa9a5d2c99e0d449f01ff38c6aba (diff)
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clocksource: add unregister function to disable unusable clocksources
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>
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/clocksource.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index edd5ef8..6e9259a 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -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