[PATCH 12/27] afs: security: Replace rcu_assign_pointer() with RCU_INIT_POINTER()

From: David Howells
Date: Thu Mar 09 2017 - 13:57:23 EST


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

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@xxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

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)