1 files changed, 18 insertions, 12 deletions

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index d8b23a929e66..846d0a1f235e 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -29,6 +29,7 @@
 
 #define TK_CLEAR_NTP            (1 << 0)
 #define TK_MIRROR               (1 << 1)
+#define TK_CLOCK_WAS_SET        (1 << 2)
 
 static struct timekeeper timekeeper;
 static DEFINE_RAW_SPINLOCK(timekeeper_lock);
@@ -204,9 +205,9 @@ static inline s64 timekeeping_get_ns_raw(struct timekeeper *tk)
 
 static RAW_NOTIFIER_HEAD(pvclock_gtod_chain);
 
-static void update_pvclock_gtod(struct timekeeper *tk)
+static void update_pvclock_gtod(struct timekeeper *tk, bool was_set)
 {
-        raw_notifier_call_chain(&pvclock_gtod_chain, 0, tk);
+        raw_notifier_call_chain(&pvclock_gtod_chain, was_set, tk);
 }
 
 /**
@@ -220,7 +221,7 @@ int pvclock_gtod_register_notifier(struct notifier_block *nb)
 
         raw_spin_lock_irqsave(&timekeeper_lock, flags);
         ret = raw_notifier_chain_register(&pvclock_gtod_chain, nb);
-        update_pvclock_gtod(tk);
+        update_pvclock_gtod(tk, true);
         raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
 
         return ret;
@@ -252,7 +253,7 @@ static void timekeeping_update(struct timekeeper *tk, unsigned int action)
                 ntp_clear();
         }
         update_vsyscall(tk);
-        update_pvclock_gtod(tk);
+        update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET);
 
         if (action & TK_MIRROR)
                 memcpy(&shadow_timekeeper, &timekeeper, sizeof(timekeeper));
@@ -512,7 +513,7 @@ int do_settimeofday(const struct timespec *tv)
 
         tk_set_xtime(tk, tv);
 
-        timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR);
+        timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
 
         write_seqcount_end(&timekeeper_seq);
         raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
@@ -556,7 +557,7 @@ int timekeeping_inject_offset(struct timespec *ts)
         tk_set_wall_to_mono(tk, timespec_sub(tk->wall_to_monotonic, *ts));
 
 error: /* even if we error out, we forwarded the time, so call update */
-        timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR);
+        timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
 
         write_seqcount_end(&timekeeper_seq);
         raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
@@ -646,7 +647,7 @@ static int change_clocksource(void *data)
                         module_put(new->owner);
                 }
         }
-        timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR);
+        timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
 
         write_seqcount_end(&timekeeper_seq);
         raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
@@ -887,7 +888,7 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
 
         __timekeeping_inject_sleeptime(tk, delta);
 
-        timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR);
+        timekeeping_update(tk, TK_CLEAR_NTP | TK_MIRROR | TK_CLOCK_WAS_SET);
 
         write_seqcount_end(&timekeeper_seq);
         raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
@@ -969,7 +970,7 @@ static void timekeeping_resume(void)
         tk->cycle_last = clock->cycle_last = cycle_now;
         tk->ntp_error = 0;
         timekeeping_suspended = 0;
-        timekeeping_update(tk, TK_MIRROR);
+        timekeeping_update(tk, TK_MIRROR | TK_CLOCK_WAS_SET);
         write_seqcount_end(&timekeeper_seq);
         raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
 
@@ -1243,9 +1244,10 @@ out_adjust:
  * It also calls into the NTP code to handle leapsecond processing.
  *
  */
-static inline void accumulate_nsecs_to_secs(struct timekeeper *tk)
+static inline unsigned int accumulate_nsecs_to_secs(struct timekeeper *tk)
 {
         u64 nsecps = (u64)NSEC_PER_SEC << tk->shift;
+        unsigned int action = 0;
 
         while (tk->xtime_nsec >= nsecps) {
                 int leap;
@@ -1268,8 +1270,10 @@ static inline void accumulate_nsecs_to_secs(struct timekeeper *tk)
                         __timekeeping_set_tai_offset(tk, tk->tai_offset - leap);
 
                         clock_was_set_delayed();
+                        action = TK_CLOCK_WAS_SET;
                 }
         }
+        return action;
 }
 
 /**
@@ -1354,6 +1358,7 @@ static void update_wall_time(void)
         struct timekeeper *tk = &shadow_timekeeper;
         cycle_t offset;
         int shift = 0, maxshift;
+        unsigned int action;
         unsigned long flags;
 
         raw_spin_lock_irqsave(&timekeeper_lock, flags);
@@ -1406,7 +1411,7 @@ static void update_wall_time(void)
          * Finally, make sure that after the rounding
          * xtime_nsec isn't larger than NSEC_PER_SEC
          */
-        accumulate_nsecs_to_secs(tk);
+        action = accumulate_nsecs_to_secs(tk);
 
         write_seqcount_begin(&timekeeper_seq);
         /* Update clock->cycle_last with the new value */
@@ -1422,7 +1427,7 @@ static void update_wall_time(void)
          * updating.
          */
         memcpy(real_tk, tk, sizeof(*tk));
-        timekeeping_update(real_tk, 0);
+        timekeeping_update(real_tk, action);
         write_seqcount_end(&timekeeper_seq);
 out:
         raw_spin_unlock_irqrestore(&timekeeper_lock, flags);
@@ -1684,6 +1689,7 @@ int do_adjtimex(struct timex *txc)
 
         if (tai != orig_tai) {
                 __timekeeping_set_tai_offset(tk, tai);
+                update_pvclock_gtod(tk, true);
                 clock_was_set_delayed();
         }
         write_seqcount_end(&timekeeper_seq);