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
  */