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authorPaul Gortmaker <paul.gortmaker@windriver.com>2012-12-20 09:35:02 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-01-08 14:12:18 -0800
commit353af9c9a866b07492b15a4efd18ec93123d3a1d (patch)
treea514865e4134796a7a1b2cf1ae85e5c89e821eee /kernel
parentd1c3ed669a2d452cacfb48c2d171a1f364dae2ed (diff)
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/rcutree_plugin.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index f6e5ec2932b..43dba2d798a 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -2366,10 +2366,11 @@ static int rcu_nocb_kthread(void *arg)
for (;;) {
/* If not polling, wait for next batch of callbacks. */
if (!rcu_nocb_poll)
- wait_event(rdp->nocb_wq, rdp->nocb_head);
+ wait_event_interruptible(rdp->nocb_wq, rdp->nocb_head);
list = ACCESS_ONCE(rdp->nocb_head);
if (!list) {
schedule_timeout_interruptible(1);
+ flush_signals(current);
continue;
}