ipv4: Dirty less cache lines in route caching paths.

Don't bother incrementing dst->__use and setting dst->lastuse,
they are completely pointless and just slow things down.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 7e1c0ed0ef70..b8707779b85d 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1443,7 +1443,7 @@ static int __mkroute_input(struct sk_buff *skb,
                 if (!(flags & RTCF_DIRECTSRC) && !itag) {
                         rth = FIB_RES_NH(*res).nh_rth_input;
                         if (rt_cache_valid(rth)) {
-                                dst_use(&rth->dst, jiffies);
+                                dst_hold(&rth->dst);
                                 goto out;
                         }
                         do_cache = true;
@@ -1619,7 +1619,7 @@ local_input:
                 if (!(flags & RTCF_DIRECTSRC) && !itag) {
                         rth = FIB_RES_NH(res).nh_rth_input;
                         if (rt_cache_valid(rth)) {
-                                dst_use(&rth->dst, jiffies);
+                                dst_hold(&rth->dst);
                                 goto set_and_out;
                         }
                         do_cache = true;
@@ -1789,7 +1789,7 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
                 if (!fnhe) {
                         rth = FIB_RES_NH(*res).nh_rth_output;
                         if (rt_cache_valid(rth)) {
-                                dst_use(&rth->dst, jiffies);
+                                dst_hold(&rth->dst);
                                 return rth;
                         }
                 }