rhashtable: Make rhashtable_init params argument const

This patch marks the rhashtable_init params argument const as
there is no reason to modify it since we will always make a copy
of it in the rhashtable.

This patch also fixes a bug where we don't actually round up the
value of min_size unless it is less than HASH_MIN_SIZE.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 6 insertions, 4 deletions

diff --git a/include/linux/rhashtable.h b/include/linux/rhashtable.h
index 99425f2be708..c85363c45fc0 100644
--- a/include/linux/rhashtable.h
+++ b/include/linux/rhashtable.h
@@ -181,7 +181,8 @@ static inline int lockdep_rht_bucket_is_held(const struct bucket_table *tbl,
 }
 #endif /* CONFIG_PROVE_LOCKING */
 
-int rhashtable_init(struct rhashtable *ht, struct rhashtable_params *params);
+int rhashtable_init(struct rhashtable *ht,
+                    const struct rhashtable_params *params);
 
 void rhashtable_insert(struct rhashtable *ht, struct rhash_head *node);
 bool rhashtable_remove(struct rhashtable *ht, struct rhash_head *node);
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index e75c48d9d82f..e0a9d59f80d6 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -870,7 +870,7 @@ out:
 }
 EXPORT_SYMBOL_GPL(rhashtable_walk_stop);
 
-static size_t rounded_hashtable_size(struct rhashtable_params *params)
+static size_t rounded_hashtable_size(const struct rhashtable_params *params)
 {
         return max(roundup_pow_of_two(params->nelem_hint * 4 / 3),
                    (unsigned long)params->min_size);
@@ -919,7 +919,8 @@ static size_t rounded_hashtable_size(struct rhashtable_params *params)
  *      .obj_hashfn = my_hash_fn,
  * };
  */
-int rhashtable_init(struct rhashtable *ht, struct rhashtable_params *params)
+int rhashtable_init(struct rhashtable *ht,
+                    const struct rhashtable_params *params)
 {
         struct bucket_table *tbl;
         size_t size;
@@ -946,7 +947,7 @@ int rhashtable_init(struct rhashtable *ht, struct rhashtable_params *params)
         if (params->max_size)
                 ht->p.max_size = rounddown_pow_of_two(params->max_size);
 
-        ht->p.min_size = max(params->min_size, HASH_MIN_SIZE);
+        ht->p.min_size = max(ht->p.min_size, HASH_MIN_SIZE);
 
         if (params->locks_mul)
                 ht->p.locks_mul = roundup_pow_of_two(params->locks_mul);