Commit e11f1335 authored Nov 04, 2015 by Peter Zijlstra Committed by Paul E. McKenney Dec 07, 2015

rcu: Move wakeup out from under rnp->lock



This patch removes a potential deadlock hazard by moving the
wake_up_process() in rcu_spawn_gp_kthread() out from under rnp->lock.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

parent f039f0af

kernel/rcu/tree.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -4319,8 +4319,8 @@ static int __init rcu_spawn_gp_kthread(void)
		sp.sched_priority = kthread_prio;
		sched_setscheduler_nocheck(t, SCHED_FIFO, &sp);
		}
		wake_up_process(t);
		raw_spin_unlock_irqrestore(&rnp->lock, flags);
		wake_up_process(t);
		}
		rcu_spawn_nocb_kthreads();
		rcu_spawn_boost_kthreads();