tcp: tcp_make_synack() consumes dst parameter
tcp_make_synack() clones the dst, and callers release it. We can avoid two atomic operations per SYNACK if tcp_make_synack() consumes dst instead of cloning it. Signed-off-by: NEric Dumazet <edumazet@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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