From c15fc199b3757496325c4855662fad89bd1efdad Mon Sep 17 00:00:00 2001 From: Miaohe Lin Date: Sat, 1 Aug 2020 17:30:23 +0800 Subject: [PATCH] net: Use __skb_pagelen() directly in skb_cow_data() In fact, skb_pagelen() - skb_headlen() is equal to __skb_pagelen(), use it directly to avoid unnecessary skb_headlen() call. Also fix the CHECK note of checkpatch.pl: Comparison to NULL could be written "!__pskb_pull_tail" Signed-off-by: Miaohe Lin Signed-off-by: David S. Miller --- net/core/skbuff.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 4e2edfbe0e19..97ad6523e490 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -4413,7 +4413,7 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer) * at the moment even if they are anonymous). */ if ((skb_cloned(skb) || skb_shinfo(skb)->nr_frags) && - __pskb_pull_tail(skb, skb_pagelen(skb)-skb_headlen(skb)) == NULL) + !__pskb_pull_tail(skb, __skb_pagelen(skb))) return -ENOMEM; /* Easy case. Most of packets will go this way. */