[PATCH] remove likely in ip_rcv_finish()

[Hua Zhong <hzhong@gmail.com>]

Hi,

This is another result from my likely profiling tool (dwalker@mvista.com just sent the patch of the profiling tool to linux-kernel mailing list, which is similar to what I use).

On my system (not very busy, normal development machine within a VMWare workstation), I see a 6/5 miss/hit ratio for the following "likely".

I am not sure what would happen for a busy system though (on which performance actually matters), but I am just reporting what I find and hope it might help.

Signed-off-by: Hua Zhong <hzhong@gmail.com>

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 18d7fad..9f44359 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -337,7 +337,7 @@ static inline int ip_rcv_finish(struct s
  	 *	Initialise the virtual path cache for the packet. It describes
  	 *	how the packet travels inside Linux networking.
  	 */ 
-	if (likely(skb->dst == NULL)) {
+	if (skb->dst) {
  		int err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
  					 skb->dev);
  		if (unlikely(err)) {