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rcu: Prevent soft-lockup complaints about no-CBs CPUs
The wait_event() at the head of the rcu_nocb_kthread() can result in soft-lockup complaints if the CPU in question does not register RCU callbacks for an extended period. This commit therefore changes the wait_event() to a wait_event_interruptible(). Reported-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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1 changed files with 2 additions and 1 deletions
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@ -2366,10 +2366,11 @@ static int rcu_nocb_kthread(void *arg)
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for (;;) {
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/* If not polling, wait for next batch of callbacks. */
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if (!rcu_nocb_poll)
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wait_event(rdp->nocb_wq, rdp->nocb_head);
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wait_event_interruptible(rdp->nocb_wq, rdp->nocb_head);
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list = ACCESS_ONCE(rdp->nocb_head);
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if (!list) {
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schedule_timeout_interruptible(1);
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flush_signals(current);
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continue;
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}
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