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-rw-r--r--include/linux/clocksource.h2
-rw-r--r--kernel/time/clocksource.c6
-rw-r--r--kernel/time/timekeeping.c5
3 files changed, 7 insertions, 6 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 7279b94c01da..aa6ba44e75d5 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -321,7 +321,7 @@ static inline void __clocksource_updatefreq_khz(struct clocksource *cs, u32 khz)
}
-extern void timekeeping_notify(struct clocksource *clock);
+extern int timekeeping_notify(struct clocksource *clock);
extern cycle_t clocksource_mmio_readl_up(struct clocksource *);
extern cycle_t clocksource_mmio_readl_down(struct clocksource *);
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index dda5c7130d93..1923a340bd91 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -611,10 +611,10 @@ static void clocksource_select(void)
best = cs;
break;
}
- if (curr_clocksource != best) {
- printk(KERN_INFO "Switching to clocksource %s\n", best->name);
+
+ if (curr_clocksource != best && !timekeeping_notify(best)) {
+ pr_info("Switched to clocksource %s\n", best->name);
curr_clocksource = best;
- timekeeping_notify(curr_clocksource);
}
}
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 98cd470bbe49..da6e10c7a378 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -648,14 +648,15 @@ static int change_clocksource(void *data)
* This function is called from clocksource.c after a new, better clock
* source has been registered. The caller holds the clocksource_mutex.
*/
-void timekeeping_notify(struct clocksource *clock)
+int timekeeping_notify(struct clocksource *clock)
{
struct timekeeper *tk = &timekeeper;
if (tk->clock == clock)
- return;
+ return 0;
stop_machine(change_clocksource, clock, NULL);
tick_clock_notify();
+ return tk->clock == clock ? 0 : -1;
}
/**