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Commit a7901766 authored by Karsten Wiese's avatar Karsten Wiese Committed by Thomas Gleixner
Browse files

time: don't touch an offlined CPU's ts->tick_stopped in tick_cancel_sched_timer()



Silences WARN_ONs in rcu_enter_nohz() and rcu_exit_nohz(), which appeared
before caused by (repeated) calls to:
        $ echo 0 > /sys/devices/system/cpu/cpu1/online
        $ echo 1 > /sys/devices/system/cpu/cpu1/online

Signed-off-by: default avatarKarsten Wiese <fzu@wemgehoertderstaat.de>
Cc: johnstul@us.ibm.com
Cc: Rafael Wysocki <rjw@sisk.pl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 38332cb9
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+1 −1
Original line number Original line Diff line number Diff line
@@ -640,7 +640,7 @@ void tick_cancel_sched_timer(int cpu)


	if (ts->sched_timer.base)
	if (ts->sched_timer.base)
		hrtimer_cancel(&ts->sched_timer);
		hrtimer_cancel(&ts->sched_timer);
	ts->tick_stopped = 0;

	ts->nohz_mode = NOHZ_MODE_INACTIVE;
	ts->nohz_mode = NOHZ_MODE_INACTIVE;
}
}
#endif /* HIGH_RES_TIMERS */
#endif /* HIGH_RES_TIMERS */