Commit b24efdfd authored Jan 12, 2011 by Paul E. McKenney Committed by Paul E. McKenney Jan 14, 2011

rcu: avoid pointless blocked-task warnings



If the RCU callback-processing kthread has nothing to do, it parks in
a wait_event().  If RCU remains idle for more than two minutes, the
kernel complains about this.  This commit changes from wait_event()
to wait_event_interruptible() to prevent the kernel from complaining
just because RCU is idle.

Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Thomas Weber <weber@corscience.de>
Tested-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent c072a388

kernel/rcutiny.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -189,7 +189,8 @@ static int rcu_kthread(void *arg)
		unsigned long flags;

		for (;;) {
		wait_event(rcu_kthread_wq, have_rcu_kthread_work != 0);
		wait_event_interruptible(rcu_kthread_wq,
		have_rcu_kthread_work != 0);
		morework = rcu_boost();
		local_irq_save(flags);
		work = have_rcu_kthread_work;

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