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authorThomas Gleixner <tglx@linutronix.de>2007-11-28 15:52:56 +0100
committerIngo Molnar <mingo@elte.hu>2007-11-28 15:52:56 +0100
commitd3938204468dccae16be0099a2abf53db4ed0505 (patch)
treec38797ab6c6f0ef19e1da713da2c079c691affc7
parenta531a141089714efe39eca89593524fdf05104f2 (diff)
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>
-rw-r--r--kernel/time/tick-sched.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 27a2338deb4..cb89fa8db11 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -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();