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authorThomas Gleixner <tglx@linutronix.de>2007-05-09 13:35:15 +0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-09 23:30:56 +0400
commitb52f52a093bb1e841e014c2087b5bee7162da413 (patch)
tree7b7135897195fc9d14473d3ab824d59a4b65e5ad /include/linux/clocksource.h
parent4037d452202e34214e8a939fa5621b2b3bbb45b7 (diff)
downloadlinux-b52f52a093bb1e841e014c2087b5bee7162da413.tar.xz
clocksource: fix resume logic
We need to make sure that the clocksources are resumed, when timekeeping is resumed. The current resume logic does not guarantee this. Add a resume function pointer to the clocksource struct, so clocksource drivers which need to reinitialize the clocksource can provide a resume function. Add a resume function, which calls the maybe available clocksource resume functions and resets the watchdog function, so a stable TSC can be used accross suspend/resume. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: john stultz <johnstul@us.ibm.com> Cc: Andi Kleen <ak@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/clocksource.h')
-rw-r--r--include/linux/clocksource.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 2665ca04cf8f..bf297b03a4e4 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -49,6 +49,7 @@ struct clocksource;
* @shift: cycle to nanosecond divisor (power of two)
* @flags: flags describing special properties
* @vread: vsyscall based read
+ * @resume: resume function for the clocksource, if necessary
* @cycle_interval: Used internally by timekeeping core, please ignore.
* @xtime_interval: Used internally by timekeeping core, please ignore.
*/
@@ -65,6 +66,7 @@ struct clocksource {
u32 shift;
unsigned long flags;
cycle_t (*vread)(void);
+ void (*resume)(void);
/* timekeeping specific data, ignore */
cycle_t cycle_interval;
@@ -209,6 +211,7 @@ static inline void clocksource_calculate_interval(struct clocksource *c,
extern int clocksource_register(struct clocksource*);
extern struct clocksource* clocksource_get_next(void);
extern void clocksource_change_rating(struct clocksource *cs, int rating);
+extern void clocksource_resume(void);
#ifdef CONFIG_GENERIC_TIME_VSYSCALL
extern void update_vsyscall(struct timespec *ts, struct clocksource *c);