On Fri, 2012-08-03 at 16:23 +0200, Sasha Levin wrote: > This hashtable implementation is using hlist buckets to provide a simple > hashtable to prevent it from getting reimplemented all over the kernel. >
> +static void hash_add(struct hash_table *ht, struct hlist_node *node, long > key) > +{ > + hlist_add_head(node, > + &ht->buckets[hash_long((unsigned long)key, HASH_BITS(ht))]); > +} > + Why key is a long, casted later to "unsigned long" ? hash_long() is expensive on 64bit arches, and not really needed if key is an u32 from the beginning ( I am referring to your patches 6 & 7 using jhash() ) Maybe you could use a macro, so that we can automatically select hash_32() if key is an u32, and hash_long() for other types. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/