1 files changed, 6 insertions, 0 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 6c9e7c8735bf..a24d6d5d83f6 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1254,6 +1254,12 @@ static void sched_avg_update(struct rq *rq)
         s64 period = sched_avg_period();
 
         while ((s64)(rq->clock - rq->age_stamp) > period) {
+                /*
+                 * Inline assembly required to prevent the compiler
+                 * optimising this loop into a divmod call.
+                 * See __iter_div_u64_rem() for another example of this.
+                 */
+                asm("" : "+rm" (rq->age_stamp));
                 rq->age_stamp += period;
                 rq->rt_avg /= 2;
         }