linux-kernel - [PATCH 05/10] rcu: Remove useless conditional nocb unlock

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Date:   Wed, 13 May 2020 18:47:09 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Paul E . McKenney" <paulmck@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Josh Triplett <josh@...htriplett.org>
Subject: [PATCH 05/10] rcu: Remove useless conditional nocb unlock

Not only is it in the bad order (rdp->nocb_lock should be unlocked after
rnp) but it's also dead code as we are in the !offloaded path.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
Cc: Paul E. McKenney <paulmck@...nel.org>
Cc: Josh Triplett <josh@...htriplett.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Lai Jiangshan <jiangshanlai@...il.com>
Cc: Joel Fernandes <joel@...lfernandes.org>
---
 kernel/rcu/tree.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 804cf7dfff03..cc95419f6491 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3680,7 +3680,6 @@ void rcutree_migrate_callbacks(int cpu)
 		raw_spin_unlock_rcu_node(my_rnp); /* irqs remain disabled. */
 		__call_rcu_nocb_wake(my_rdp, true, flags);
 	} else {
-		rcu_nocb_unlock(my_rdp); /* irqs remain disabled. */
 		raw_spin_unlock_irqrestore_rcu_node(my_rnp, flags);
 	}
 	if (needwake)
-- 
2.25.0