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>

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 40940b0d0310..87b604d0b0d2 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -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();