[PATCH net-next 3/5] rhashtable: abstract out function to get hash
From: Tom Herbert <hidden>
Date: 2017-12-01 00:03:47
Subsystem:
rhashtable, the rest · Maintainers:
Thomas Graf, Herbert Xu, Linus Torvalds
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 <redacted> --- include/linux/rhashtable.h | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-)
diff --git a/include/linux/rhashtable.h b/include/linux/rhashtable.h
index 7f3e674e127a..61d0fd707d12 100644
--- a/include/linux/rhashtable.h
+++ b/include/linux/rhashtable.h@@ -239,34 +239,42 @@ 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); }
--
2.11.0