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netfilter: xt_HMARK: modulus is expensive for hash calculation 

Use:

((u64)(HASH_VAL * HASH_SIZE)) >> 32

as suggested by David S. Miller.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2012-05-14 02:01:46 +02:00
parent 5861811549
commit c44f5faa8e
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/xt_HMARK.c
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@ -109,7 +109,7 @@ hmark_hash(struct hmark_tuple *t, const struct xt_hmark_info *info)
hash = jhash_3words(t->src, t->dst, t->uports.v32, info->hashrnd);
hash = hash ^ (t->proto & info->proto_mask);
return (hash % info->hmodulus) + info->hoffset;
return (((u64)hash * info->hmodulus) >> 32) + info->hoffset;
}
static void