afs: inode: Replace rcu_assign_pointer() with RCU_INIT_POINTER()

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)

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

index 2946712..6457621 100644
@@ -445,7 +445,7 @@ void afs_evict_inode(struct inode *inode)
 
 	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)
 		call_rcu(&permits->rcu, afs_zap_permits);

1.9.1

I've applied these two patches, but one of them throws up a problem in Fengguang's magic auto-compilation thing.

David

Hello, David,

I seem to have fat-fingered Fengguang's magic auto-compilation thing's email. (One of those mornings, I guess...) Could you please point me at it?

Thanx, Paul