Commit d3938204 authored Nov 28, 2007 by Thomas Gleixner Committed by Ingo Molnar Nov 28, 2007

softlockup: fix false positives on CONFIG_NOHZ

David Miller reported soft lockup false-positives that trigger
on NOHZ due to CPUs idling for more than 10 seconds.

The solution is touch the softlockup watchdog when we return from
idle. (by definition we are not 'locked up' when we were idle)

 http://bugzilla.kernel.org/show_bug.cgi?id=9409



Reported-by: David Miller <davem@davemloft.net>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent a531a141

kernel/time/tick-sched.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -133,6 +133,8 @@ void tick_nohz_update_jiffies(void)
		if (!ts->tick_stopped)
		return;

		touch_softlockup_watchdog();

		cpu_clear(cpu, nohz_cpu_mask);
		now = ktime_get();

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