tcp: replace ehash_size by ehash_mask
Storing the mask (size - 1) instead of the size allows fast path to be
a bit faster.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index a156319..ecb203f 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -1060,11 +1060,12 @@
for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++)
;
do {
- dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE /
+ unsigned long hash_size = (1UL << ehash_order) * PAGE_SIZE /
sizeof(struct inet_ehash_bucket);
- while (dccp_hashinfo.ehash_size &
- (dccp_hashinfo.ehash_size - 1))
- dccp_hashinfo.ehash_size--;
+
+ while (hash_size & (hash_size - 1))
+ hash_size--;
+ dccp_hashinfo.ehash_mask = hash_size - 1;
dccp_hashinfo.ehash = (struct inet_ehash_bucket *)
__get_free_pages(GFP_ATOMIC|__GFP_NOWARN, ehash_order);
} while (!dccp_hashinfo.ehash && --ehash_order > 0);
@@ -1074,7 +1075,7 @@
goto out_free_bind_bucket_cachep;
}
- for (i = 0; i < dccp_hashinfo.ehash_size; i++) {
+ for (i = 0; i <= dccp_hashinfo.ehash_mask; i++) {
INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i);
INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].twchain, i);
}
@@ -1153,7 +1154,7 @@
get_order(dccp_hashinfo.bhash_size *
sizeof(struct inet_bind_hashbucket)));
free_pages((unsigned long)dccp_hashinfo.ehash,
- get_order(dccp_hashinfo.ehash_size *
+ get_order((dccp_hashinfo.ehash_mask + 1) *
sizeof(struct inet_ehash_bucket)));
inet_ehash_locks_free(&dccp_hashinfo);
kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);