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-rw-r--r--kernel/time/clocksource.c28
1 files changed, 18 insertions, 10 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 2c2e5ba1453d..09113347d328 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -121,6 +121,7 @@ static struct clocksource *curr_clocksource;
static LIST_HEAD(clocksource_list);
static DEFINE_MUTEX(clocksource_mutex);
static char override_name[32];
+static int finished_booting;
#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
static void clocksource_watchdog_work(struct work_struct *work);
@@ -155,7 +156,8 @@ static void __clocksource_unstable(struct clocksource *cs)
{
cs->flags &= ~(CLOCK_SOURCE_VALID_FOR_HRES | CLOCK_SOURCE_WATCHDOG);
cs->flags |= CLOCK_SOURCE_UNSTABLE;
- schedule_work(&watchdog_work);
+ if (finished_booting)
+ schedule_work(&watchdog_work);
}
static void clocksource_unstable(struct clocksource *cs, int64_t delta)
@@ -207,7 +209,8 @@ static void clocksource_watchdog(unsigned long data)
/* Clocksource already marked unstable? */
if (cs->flags & CLOCK_SOURCE_UNSTABLE) {
- schedule_work(&watchdog_work);
+ if (finished_booting)
+ schedule_work(&watchdog_work);
continue;
}
@@ -380,6 +383,7 @@ static void clocksource_enqueue_watchdog(struct clocksource *cs)
static inline void clocksource_dequeue_watchdog(struct clocksource *cs) { }
static inline void clocksource_resume_watchdog(void) { }
+static inline int clocksource_watchdog_kthread(void *data) { return 0; }
#endif /* CONFIG_CLOCKSOURCE_WATCHDOG */
@@ -415,8 +419,6 @@ void clocksource_touch_watchdog(void)
#ifdef CONFIG_GENERIC_TIME
-static int finished_booting;
-
/**
* clocksource_select - Select the best clocksource available
*
@@ -461,6 +463,12 @@ static void clocksource_select(void)
}
}
+#else /* CONFIG_GENERIC_TIME */
+
+static inline void clocksource_select(void) { }
+
+#endif
+
/*
* clocksource_done_booting - Called near the end of core bootup
*
@@ -471,6 +479,12 @@ static void clocksource_select(void)
static int __init clocksource_done_booting(void)
{
finished_booting = 1;
+
+ /*
+ * Run the watchdog first to eliminate unstable clock sources
+ */
+ clocksource_watchdog_kthread(NULL);
+
mutex_lock(&clocksource_mutex);
clocksource_select();
mutex_unlock(&clocksource_mutex);
@@ -478,12 +492,6 @@ static int __init clocksource_done_booting(void)
}
fs_initcall(clocksource_done_booting);
-#else /* CONFIG_GENERIC_TIME */
-
-static inline void clocksource_select(void) { }
-
-#endif
-
/*
* Enqueue the clocksource sorted by rating
*/
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