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 <linmiaohe@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -4413,7 +4413,7 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
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* at the moment even if they are anonymous).
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*/
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if ((skb_cloned(skb) || skb_shinfo(skb)->nr_frags) &&
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__pskb_pull_tail(skb, skb_pagelen(skb)-skb_headlen(skb)) == NULL)
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!__pskb_pull_tail(skb, __skb_pagelen(skb)))
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return -ENOMEM;
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/* Easy case. Most of packets will go this way. */
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