[PATCH net-next] bridge: avoid unnecessary read of jiffies

[Stephen Hemminger]

Jiffies is volatile so read it once.

Signed-off-by: Stephen Hemminger <sthem...@microsoft.com>
---
 net/bridge/br_fdb.c   | 6 ++++--
 net/bridge/br_input.c | 6 ++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 5028691fa68a..5693168e88b6 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -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))
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 220943f920d2..4615a9b3e26c 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -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)
-- 
2.11.0