[NET]: Optimize pskb_trim_rcsum()
authorStephen Hemminger <shemminger@osdl.org>
Thu, 8 Sep 2005 19:32:03 +0000 (12:32 -0700)
committerDavid S. Miller <davem@davemloft.net>
Thu, 8 Sep 2005 19:32:03 +0000 (12:32 -0700)
Since packets almost never contain extra garbage at the end, it is
worthwhile to optimize for that case.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/linux/skbuff.h

index da7da9c0ed1b50e1f8dac7c08b919c104c287e30..2741c0c55e83e1f486a7effc3772a63da8f4e3ed 100644 (file)
@@ -1167,7 +1167,7 @@ static inline void skb_postpull_rcsum(struct sk_buff *skb,
 
 static inline int pskb_trim_rcsum(struct sk_buff *skb, unsigned int len)
 {
-       if (len >= skb->len)
+       if (likely(len >= skb->len))
                return 0;
        if (skb->ip_summed == CHECKSUM_HW)
                skb->ip_summed = CHECKSUM_NONE;