linux-kernel - [tip: core/rcu] rcu/nocb: Add missing annotation for rcu_nocb_bypass

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Date:   Tue, 24 Mar 2020 09:16:47 -0000
From:   "tip-bot2 for Jules Irenge" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Jules Irenge <jbi.octave@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: core/rcu] rcu/nocb: Add missing annotation for rcu_nocb_bypass_unlock()

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     92c0b889f2ff6898710d49458b6eae1de50895c6
Gitweb:        https://git.kernel.org/tip/92c0b889f2ff6898710d49458b6eae1de50895c6
Author:        Jules Irenge <jbi.octave@...il.com>
AuthorDate:    Thu, 30 Jan 2020 00:30:09 
Committer:     Paul E. McKenney <paulmck@...nel.org>
CommitterDate: Thu, 20 Feb 2020 15:58:23 -08:00

rcu/nocb: Add missing annotation for rcu_nocb_bypass_unlock()

Sparse reports warning at rcu_nocb_bypass_unlock()

warning: context imbalance in rcu_nocb_bypass_unlock() - unexpected unlock

The root cause is a missing annotation of rcu_nocb_bypass_unlock()
which causes the warning.

This commit therefore adds the missing __releases(&rdp->nocb_bypass_lock)
annotation.

Signed-off-by: Jules Irenge <jbi.octave@...il.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Acked-by: Boqun Feng <boqun.feng@...il.com>
---
 kernel/rcu/tree_plugin.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 6db2cad..3846519 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1530,6 +1530,7 @@ static bool rcu_nocb_bypass_trylock(struct rcu_data *rdp)
  * Release the specified rcu_data structure's ->nocb_bypass_lock.
  */
 static void rcu_nocb_bypass_unlock(struct rcu_data *rdp)
+	__releases(&rdp->nocb_bypass_lock)
 {
 	lockdep_assert_irqs_disabled();
 	raw_spin_unlock(&rdp->nocb_bypass_lock);