clockevents: prevent stale tick_next_period for onlining CPUs

Impact: possible hang on CPU onlining in timer one shot mode. The tick_next_period variable is only used during boot on nohz/highres enabled systems, but for CPU onlining it needs to be maintained when the per cpu clock events device operates in one shot mode. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

clockevents: prevent stale tick_next_period for onlining CPUs
Impact: possible hang on CPU onlining in timer one shot mode. The tick_next_period variable is only used during boot on nohz/highres enabled systems, but for CPU onlining it needs to be maintained when the per cpu clock events device operates in one shot mode. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Thomas Gleixner
1 parent 4faac97d44
Showing 1 changed file with 3 additions and 0 deletions Side-by-side Diff
kernel/time/tick-sched.c
@@ -75,6 +75,9 @@
 							   incr * ticks);
 		}
 		do_timer(++ticks);
+
+		/* Keep the tick_next_period variable up to date */
+		tick_next_period = ktime_add(last_jiffies_update, tick_period);
 	}
 	write_sequnlock(&xtime_lock);
 }
...	...	@@ -75,6 +75,9 @@
75	75	incr * ticks);
76	76	}
77	77	do_timer(++ticks);
	78	+
	79	+ /* Keep the tick_next_period variable up to date */
	80	+ tick_next_period = ktime_add(last_jiffies_update, tick_period);
78	81	}
79	82	write_sequnlock(&xtime_lock);
80	83	}