2 files changed, 12 insertions, 11 deletions

diff --git a/include/linux/timekeeper_internal.h b/include/linux/timekeeper_internal.h
index e9834ada4d0c..f7043ccca81c 100644
--- a/include/linux/timekeeper_internal.h
+++ b/include/linux/timekeeper_internal.h
@@ -57,7 +57,7 @@ struct tk_read_base {
  *                      interval.
  * @xtime_remainder:    Shifted nano seconds left over when rounding
  *                      @cycle_interval
- * @raw_interval:       Raw nano seconds accumulated per NTP interval.
+ * @raw_interval:       Shifted raw nano seconds accumulated per NTP interval.
  * @ntp_error:          Difference between accumulated time and NTP time in ntp
  *                      shifted nano seconds.
  * @ntp_error_shift:    Shift conversion between clock shifted nano seconds and
@@ -99,7 +99,7 @@ struct timekeeper {
         u64                     cycle_interval;
         u64                     xtime_interval;
         s64                     xtime_remainder;
-        u32                     raw_interval;
+        u64                     raw_interval;
         /* The ntp_tick_length() value currently being used.
          * This cached copy ensures we consistently apply the tick
          * length for an entire tick, as ntp_tick_length may change
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index eff94cb8e89e..b602c48cb841 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -280,7 +280,7 @@ static void tk_setup_internals(struct timekeeper *tk, struct clocksource *clock)
         /* Go back from cycles -> shifted ns */
         tk->xtime_interval = interval * clock->mult;
         tk->xtime_remainder = ntpinterval - tk->xtime_interval;
-        tk->raw_interval = (interval * clock->mult) >> clock->shift;
+        tk->raw_interval = interval * clock->mult;
 
          /* if changing clocks, convert xtime_nsec shift units */
         if (old_clock) {
@@ -1996,7 +1996,7 @@ static u64 logarithmic_accumulation(struct timekeeper *tk, u64 offset,
                                     u32 shift, unsigned int *clock_set)
 {
         u64 interval = tk->cycle_interval << shift;
-        u64 raw_nsecs;
+        u64 snsec_per_sec;
 
         /* If the offset is smaller than a shifted interval, do nothing */
         if (offset < interval)
@@ -2011,14 +2011,15 @@ static u64 logarithmic_accumulation(struct timekeeper *tk, u64 offset,
         *clock_set |= accumulate_nsecs_to_secs(tk);
 
         /* Accumulate raw time */
-        raw_nsecs = (u64)tk->raw_interval << shift;
-        raw_nsecs += tk->raw_time.tv_nsec;
-        if (raw_nsecs >= NSEC_PER_SEC) {
-                u64 raw_secs = raw_nsecs;
-                raw_nsecs = do_div(raw_secs, NSEC_PER_SEC);
-                tk->raw_time.tv_sec += raw_secs;
+        tk->tkr_raw.xtime_nsec += (u64)tk->raw_time.tv_nsec << tk->tkr_raw.shift;
+        tk->tkr_raw.xtime_nsec += tk->raw_interval << shift;
+        snsec_per_sec = (u64)NSEC_PER_SEC << tk->tkr_raw.shift;
+        while (tk->tkr_raw.xtime_nsec >= snsec_per_sec) {
+                tk->tkr_raw.xtime_nsec -= snsec_per_sec;
+                tk->raw_time.tv_sec++;
         }
-        tk->raw_time.tv_nsec = raw_nsecs;
+        tk->raw_time.tv_nsec = tk->tkr_raw.xtime_nsec >> tk->tkr_raw.shift;
+        tk->tkr_raw.xtime_nsec -= (u64)tk->raw_time.tv_nsec << tk->tkr_raw.shift;
 
         /* Accumulate error between NTP and clock interval */
         tk->ntp_error += tk->ntp_tick << shift;