diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index a07c3a4..6d32618 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -666,10 +666,11 @@
 
        rq = this_rq();
 
-       /* Make sure rq->nr_running update is visible after the IPI */
-       smp_rmb();
-
-       /* More than one running task need preemption */
+       /*
+	* More than one running task need preemption.
+	* nr_running update is assumed to be visible
+	* after IPI is sent from wakers.
+	*/
        if (rq->nr_running > 1)
                return false;
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 3b165c1..ec248dc 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1231,8 +1231,14 @@
 #ifdef CONFIG_NO_HZ_FULL
 	if (rq->nr_running == 2) {
 		if (tick_nohz_full_cpu(rq->cpu)) {
-			/* Order rq->nr_running write against the IPI */
-			smp_wmb();
+			/*
+			 * Tick is needed if more than one task runs on a CPU.
+			 * Send the target an IPI to kick it out of nohz mode.
+			 *
+			 * We assume that IPI implies full memory barrier and the
+			 * new value of rq->nr_running is visible on reception
+			 * from the target.
+			 */
 			tick_nohz_full_kick_cpu(rq->cpu);
 		}
        }