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-rw-r--r--lib/rhashtable.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index 618a3f00d712..798f01d64ab0 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -532,6 +532,11 @@ static size_t rounded_hashtable_size(const struct rhashtable_params *params)
(unsigned long)params->min_size);
}
+static u32 rhashtable_jhash2(const void *key, u32 length, u32 seed)
+{
+ return jhash2(key, length, seed);
+}
+
/**
* rhashtable_init - initialize a new hash table
* @ht: hash table to be initialized
@@ -583,7 +588,7 @@ int rhashtable_init(struct rhashtable *ht,
size = HASH_DEFAULT_SIZE;
- if ((!(params->key_len && params->hashfn) && !params->obj_hashfn) ||
+ if ((!params->key_len && !params->obj_hashfn) ||
(params->obj_hashfn && !params->obj_cmpfn))
return -EINVAL;
@@ -610,6 +615,16 @@ int rhashtable_init(struct rhashtable *ht,
else
ht->p.locks_mul = BUCKET_LOCKS_PER_CPU;
+ ht->key_len = ht->p.key_len;
+ if (!params->hashfn) {
+ ht->p.hashfn = jhash;
+
+ if (!(ht->key_len & (sizeof(u32) - 1))) {
+ ht->key_len /= sizeof(u32);
+ ht->p.hashfn = rhashtable_jhash2;
+ }
+ }
+
tbl = bucket_table_alloc(ht, size);
if (tbl == NULL)
return -ENOMEM;