skbuff: pass the result of data ksize to __build_skb_around
Avoid to call ksize again in __build_skb_around by passing the result of data ksize to __build_skb_around nginx stress test shows this change can reduce ksize cpu usage, and give a little performance boost Signed-off-by: NLi RongQing <lirongqing@baidu.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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