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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>
This commit is contained in:
NeilBrown 2019-04-12 11:52:08 +10:00 committed by David S. Miller
parent adc6a3ab19
commit f4712b46a5
2 changed files with 9 additions and 6 deletions
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9
include/linux/rhashtable.h
View File

@ -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,

6
lib/rhashtable.c
View File

@ -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))