[PATCH 7/7] clean tc_u_common hashtable

[Al Viro]

From: Al Viro <v...@zeniv.linux.org.uk>

* calculate key *once*, not for each hash chain element
* let tc_u_hash() return the pointer to chain head rather than index -
callers are cleaner that way.

Signed-off-by: Al Viro <v...@zeniv.linux.org.uk>
---
 net/sched/cls_u32.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index be9240ae1417..6d45ec4c218c 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -343,19 +343,16 @@ static void *tc_u_common_ptr(const struct tcf_proto *tp)
                return block->q;
 }
 
-static unsigned int tc_u_hash(const struct tcf_proto *tp)
+static struct hlist_head *tc_u_hash(void *key)
 {
-       return hash_ptr(tc_u_common_ptr(tp), U32_HASH_SHIFT);
+       return tc_u_common_hash + hash_ptr(key, U32_HASH_SHIFT);
 }
 
-static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp)
+static struct tc_u_common *tc_u_common_find(void *key)
 {
        struct tc_u_common *tc;
-       unsigned int h;
-
-       h = tc_u_hash(tp);
-       hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) {
-               if (tc->ptr == tc_u_common_ptr(tp))
+       hlist_for_each_entry(tc, tc_u_hash(key), hnode) {
+               if (tc->ptr == key)
                        return tc;
        }
        return NULL;
@@ -364,10 +361,8 @@ static struct tc_u_common *tc_u_common_find(const struct 
tcf_proto *tp)
 static int u32_init(struct tcf_proto *tp)
 {
        struct tc_u_hnode *root_ht;
-       struct tc_u_common *tp_c;
-       unsigned int h;
-
-       tp_c = tc_u_common_find(tp);
+       void *key = tc_u_common_ptr(tp);
+       struct tc_u_common *tp_c = tc_u_common_find(key);
 
        root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL);
        if (root_ht == NULL)
@@ -389,8 +384,7 @@ static int u32_init(struct tcf_proto *tp)
                INIT_HLIST_NODE(&tp_c->hnode);
                idr_init(&tp_c->handle_idr);
 
-               h = tc_u_hash(tp);
-               hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]);
+               hlist_add_head(&tp_c->hnode, tc_u_hash(key));
        }
 
        tp_c->refcnt++;
-- 
2.11.0