linux-kernel - [PATCH 12/27] afs: security: Replace rcu_assign_pointer() with RCU_INIT

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Message-ID: <148908583031.16794.3148860885485623069.stgit@warthog.procyon.org.uk>
Date:   Thu, 09 Mar 2017 18:57:10 +0000
From:   David Howells <dhowells@...hat.com>
To:     viro@...IV.linux.org.uk
Cc:     dhowells@...hat.com,
        Andreea-Cristina Bernat <bernat.ada@...il.com>,
        linux-fsdevel@...r.kernel.org, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 12/27] afs: security: Replace rcu_assign_pointer() with
 RCU_INIT_POINTER()

From: Andreea-Cristina Bernat <bernat.ada@...il.com>

The use of "rcu_assign_pointer()" is NULLing out the pointer.
According to RCU_INIT_POINTER()'s block comment:
"1.   This use of RCU_INIT_POINTER() is NULLing out the pointer"
it is better to use it instead of rcu_assign_pointer() because it has a
smaller overhead.

The following Coccinelle semantic patch was used:
@@
@@

- rcu_assign_pointer
+ RCU_INIT_POINTER
  (..., NULL)

Signed-off-by: Andreea-Cristina Bernat <bernat.ada@...il.com>
Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/afs/security.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/afs/security.c b/fs/afs/security.c
index bfa9d3428383..ecb86a670180 100644
--- a/fs/afs/security.c
+++ b/fs/afs/security.c
@@ -114,7 +114,7 @@ void afs_clear_permits(struct afs_vnode *vnode)
 
 	mutex_lock(&vnode->permits_lock);
 	permits = vnode->permits;
-	rcu_assign_pointer(vnode->permits, NULL);
+	RCU_INIT_POINTER(vnode->permits, NULL);
 	mutex_unlock(&vnode->permits_lock);
 
 	if (permits)