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authorTom Herbert <tom@quantonium.net>2017-12-04 21:31:43 +0300
committerDavid S. Miller <davem@davemloft.net>2017-12-11 17:58:38 +0300
commit2b86093135d014624f668658e1636f22a3027fc2 (patch)
tree20589b1f38ef6c5a12d38bfe2c923c4d519ab64f /include/linux/rhashtable.h
parent2db54b475ae918d274bfc276416c384ba95e9f94 (diff)
downloadlinux-2b86093135d014624f668658e1636f22a3027fc2.tar.xz
rhashtable: abstract out function to get hash
Split out most of rht_key_hashfn which is calculating the hash into its own function. This way the hash function can be called separately to get the hash value. Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: Tom Herbert <tom@quantonium.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/rhashtable.h')
-rw-r--r--include/linux/rhashtable.h28
1 files changed, 18 insertions, 10 deletions
diff --git a/include/linux/rhashtable.h b/include/linux/rhashtable.h
index 542b1b265ac4..c9df2527e0cd 100644
--- a/include/linux/rhashtable.h
+++ b/include/linux/rhashtable.h
@@ -240,34 +240,42 @@ static inline unsigned int rht_bucket_index(const struct bucket_table *tbl,
return (hash >> RHT_HASH_RESERVED_SPACE) & (tbl->size - 1);
}
-static inline unsigned int rht_key_hashfn(
- struct rhashtable *ht, const struct bucket_table *tbl,
- const void *key, const struct rhashtable_params params)
+static inline unsigned int rht_key_get_hash(struct rhashtable *ht,
+ const void *key, const struct rhashtable_params params,
+ unsigned int hash_rnd)
{
unsigned int hash;
/* params must be equal to ht->p if it isn't constant. */
if (!__builtin_constant_p(params.key_len))
- hash = ht->p.hashfn(key, ht->key_len, tbl->hash_rnd);
+ hash = ht->p.hashfn(key, ht->key_len, hash_rnd);
else if (params.key_len) {
unsigned int key_len = params.key_len;
if (params.hashfn)
- hash = params.hashfn(key, key_len, tbl->hash_rnd);
+ hash = params.hashfn(key, key_len, hash_rnd);
else if (key_len & (sizeof(u32) - 1))
- hash = jhash(key, key_len, tbl->hash_rnd);
+ hash = jhash(key, key_len, hash_rnd);
else
- hash = jhash2(key, key_len / sizeof(u32),
- tbl->hash_rnd);
+ hash = jhash2(key, key_len / sizeof(u32), hash_rnd);
} else {
unsigned int key_len = ht->p.key_len;
if (params.hashfn)
- hash = params.hashfn(key, key_len, tbl->hash_rnd);
+ hash = params.hashfn(key, key_len, hash_rnd);
else
- hash = jhash(key, key_len, tbl->hash_rnd);
+ hash = jhash(key, key_len, hash_rnd);
}
+ return hash;
+}
+
+static inline unsigned int rht_key_hashfn(
+ struct rhashtable *ht, const struct bucket_table *tbl,
+ const void *key, const struct rhashtable_params params)
+{
+ unsigned int hash = rht_key_get_hash(ht, key, params, tbl->hash_rnd);
+
return rht_bucket_index(tbl, hash);
}