+
+ /*
+ * If this cpu is the one which updates jiffies, then
+ * give up the assignment and let it be taken by the
+ * cpu which runs the tick timer next, which might be
+ * this cpu as well. If we don't drop this here the
+ * jiffies might be stale and do_timer() never
+ * invoked.
+ */
+ if (cpu == tick_do_timer_cpu)
+ tick_do_timer_cpu = -1;
+
+ ts->idle_sleeps++;
+
+ /*
+ * delta_jiffies >= NEXT_TIMER_MAX_DELTA signals that
+ * there is no timer pending or at least extremly far
+ * into the future (12 days for HZ=1000). In this case
+ * we simply stop the tick timer:
+ */
+ if (unlikely(delta_jiffies >= NEXT_TIMER_MAX_DELTA)) {
+ ts->idle_expires.tv64 = KTIME_MAX;
+ if (ts->nohz_mode == NOHZ_MODE_HIGHRES)
+ hrtimer_cancel(&ts->sched_timer);
+ goto out;
+ }
+