tcp_lp: cache tcp_time_stamp
tcp_time_stamp will become slightly more expensive soon, cache its value. Signed-off-by: NEric Dumazet <edumazet@google.com> Acked-by: NSoheil Hassas Yeganeh <soheil@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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