Commit e4edbe3c authored by NeilBrown's avatar NeilBrown Committed by David S. Miller
Browse files

rhashtable: fix some __rcu annotation errors 



With these annotations, the rhashtable now gets no
warnings when compiled with "C=1" for sparse checking.

Signed-off-by: default avatarNeilBrown <neilb@suse.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c252aa3e

include/linux/rhashtable.h

+6 −5
Original line number Diff line number Diff line
@@ -40,7 +40,7 @@ 
 * the chain.  To avoid dereferencing this pointer without clearing

 * the bit first, we use an opaque 'struct rhash_lock_head *' for the

 * pointer stored in the bucket.  This struct needs to be defined so

 * that rcu_derefernce() works on it, but it has no content so a

 * that rcu_dereference() works on it, but it has no content so a

 * cast is needed for it to be useful.  This ensures it isn't

 * used by mistake with clearing the lock bit first.

 */
@@ -130,10 +130,10 @@ static inline void rht_unlock(struct bucket_table *tbl, 
}



static inline void rht_assign_unlock(struct bucket_table *tbl,

				     struct rhash_lock_head **bkt,

				     struct rhash_lock_head __rcu **bkt,

				     struct rhash_head *obj)

{

	struct rhash_head **p = (struct rhash_head **)bkt;

	struct rhash_head __rcu **p = (struct rhash_head __rcu **)bkt;



	lock_map_release(&tbl->dep_map);

	rcu_assign_pointer(*p, obj);
@@ -556,6 +556,7 @@ static inline struct rhash_head *__rhashtable_lookup( 
	};

	struct rhash_lock_head __rcu * const *bkt;

	struct bucket_table *tbl;

	struct rhash_head __rcu *head;

	struct rhash_head *he;

	unsigned int hash;
@@ -564,8 +565,8 @@ static inline struct rhash_head *__rhashtable_lookup( 
	hash = rht_key_hashfn(ht, tbl, key, params);

	bkt = rht_bucket(tbl, hash);

	do {

		he = rht_ptr(rht_dereference_bucket_rcu(*bkt, tbl, hash));

		rht_for_each_rcu_from(he, he, tbl, hash) {

		head = rht_ptr(rht_dereference_bucket_rcu(*bkt, tbl, hash));

		rht_for_each_rcu_from(he, head, tbl, hash) {

			if (params.obj_cmpfn ?

			    params.obj_cmpfn(&arg, rht_obj(ht, he)) :

			    rhashtable_compare(&arg, rht_obj(ht, he)))

lib/rhashtable.c

+2 −2
Original line number Diff line number Diff line
@@ -223,7 +223,7 @@ static int rhashtable_rehash_one(struct rhashtable *ht, 
	struct bucket_table *new_tbl = rhashtable_last_table(ht, old_tbl);

	int err = -EAGAIN;

	struct rhash_head *head, *next, *entry;

	struct rhash_head **pprev = NULL;

	struct rhash_head __rcu **pprev = NULL;

	unsigned int new_hash;



	if (new_tbl->nest)
@@ -486,7 +486,7 @@ static void *rhashtable_lookup_one(struct rhashtable *ht, 
		.ht = ht,

		.key = key,

	};

	struct rhash_head **pprev = NULL;

	struct rhash_head __rcu **pprev = NULL;

	struct rhash_head *head;

	int elasticity;