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[PATCH] add likely/unlikely to pskb_may_pull

To: "David S. Miller" <davem@xxxxxxxxxx>
Subject: [PATCH] add likely/unlikely to pskb_may_pull
From: Stephen Hemminger <shemminger@xxxxxxxx>
Date: Wed, 30 Jul 2003 16:18:54 -0700
Cc: netdev@xxxxxxxxxxx
Organization: Open Source Development Lab
Sender: netdev-bounce@xxxxxxxxxxx
Code that deals with received headers needs to be robust and use pskb_may_pull 
in many
places, but except in the case of DOS attacks, the packets are always correctly 
so optimize for that case.

diff -Nru a/include/linux/skbuff.h b/include/linux/skbuff.h
--- a/include/linux/skbuff.h    Wed Jul 30 15:50:31 2003
+++ b/include/linux/skbuff.h    Wed Jul 30 15:50:31 2003
@@ -904,9 +904,9 @@
 static inline int pskb_may_pull(struct sk_buff *skb, unsigned int len)
-       if (len <= skb_headlen(skb))
+       if (likely(len <= skb_headlen(skb)))
                return 1;
-       if (len > skb->len)
+       if (unlikely(len > skb->len))
                return 0;
        return __pskb_pull_tail(skb, len-skb_headlen(skb)) != NULL;

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