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bridge: avoid unnecessary read of jiffies 

Jiffies is volatile so read it once.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2017-02-07 08:46:46 -08:00 committed by David S. Miller
parent 9bcdef3288
commit ca6d4480f8
2 changed files with 8 additions and 4 deletions
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6
net/bridge/br_fdb.c
View File

@ -592,13 +592,15 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n",
source->dev->name, addr, vid);
} else {
unsigned long now = jiffies;
/* fastpath: update of existing entry */
if (unlikely(source != fdb->dst)) {
fdb->dst = source;
fdb_modified = true;
}
if (jiffies != fdb->updated)
fdb->updated = jiffies;
if (now != fdb->updated)
fdb->updated = now;
if (unlikely(added_by_user))
fdb->added_by_user = 1;
if (unlikely(fdb_modified))

6
net/bridge/br_input.c
View File

@ -195,11 +195,13 @@ int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb
}
if (dst) {
unsigned long now = jiffies;
if (dst->is_local)
return br_pass_frame_up(skb);
if (jiffies != dst->used)
dst->used = jiffies;
if (now != dst->used)
dst->used = now;
br_forward(dst->dst, skb, local_rcv, false);
} else {
if (!mcast_hit)