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rcu: avoid pointless blocked-task warnings

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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>
This commit is contained in:
Paul E. McKenney 2011-01-12 14:18:11 -08:00 committed by Paul E. McKenney
parent c072a388d5
commit b24efdfdf6
1 changed files with 2 additions and 1 deletions
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3
kernel/rcutiny.c
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@ -189,7 +189,8 @@ static int rcu_kthread(void *arg)
unsigned long flags; unsigned long flags;
for (;;) { 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(); morework = rcu_boost();
local_irq_save(flags); local_irq_save(flags);
work = have_rcu_kthread_work; work = have_rcu_kthread_work;