rhashtable: replace rht_ptr_locked() with rht_assign_locked()

The only times rht_ptr_locked() is used, it is to store a new
value in a bucket-head.  This is the only time it makes sense
to use it too.  So replace it by a function which does the
whole task:  Sets the lock bit and assigns to a bucket head.
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/rhashtable.h

@@ -316,6 +316,7 @@ static inline struct rhash_lock_head __rcu **rht_bucket_insert(
  * local_bh. For that we have rht_assign_unlock().  As rcu_assign_pointer()
  * provides the same release semantics that bit_spin_unlock() provides,
  * this is safe.
+ * When we write to a bucket without unlocking, we use rht_assign_locked().
  */
 
 static inline void rht_lock(struct bucket_table *tbl,
@@ -369,10 +370,12 @@ static inline struct rhash_head *rht_ptr_exclusive(
 	return (void *)(((unsigned long)p) & ~BIT(1));
 }
 
-static inline struct rhash_lock_head __rcu *rht_ptr_locked(const
-							   struct rhash_head *p)
+static inline void rht_assign_locked(struct rhash_lock_head __rcu **bkt,
+				     struct rhash_head *obj)
 {
-	return (void *)(((unsigned long)p) | BIT(1));
+	struct rhash_head __rcu **p = (struct rhash_head __rcu **)bkt;
+
+	rcu_assign_pointer(*p, (void *)((unsigned long)obj | BIT(1)));
 }
 
 static inline void rht_assign_unlock(struct bucket_table *tbl,

lib/rhashtable.c

@@ -259,7 +259,7 @@ static int rhashtable_rehash_one(struct rhashtable *ht,
 		rcu_assign_pointer(*pprev, next);
 	else
 		/* Need to preserved the bit lock. */
-		rcu_assign_pointer(*bkt, rht_ptr_locked(next));
+		rht_assign_locked(bkt, next);
 
 out:
 	return err;
@@ -517,7 +517,7 @@ static void *rhashtable_lookup_one(struct rhashtable *ht,
 			rcu_assign_pointer(*pprev, obj);
 		else
 			/* Need to preserve the bit lock */
-			rcu_assign_pointer(*bkt, rht_ptr_locked(obj));
+			rht_assign_locked(bkt, obj);
 
 		return NULL;
 	}
@@ -570,7 +570,7 @@ static struct bucket_table *rhashtable_insert_one(struct rhashtable *ht,
 	/* bkt is always the head of the list, so it holds
 	 * the lock, which we need to preserve
 	 */
-	rcu_assign_pointer(*bkt, rht_ptr_locked(obj));
+	rht_assign_locked(bkt, obj);
 
 	atomic_inc(&ht->nelems);
 	if (rht_grow_above_75(ht, tbl))