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tcp: annotate races around tp->urg_data
tcp_poll() and tcp_ioctl() are reading tp->urg_data without socket lock owned. Also, it is faster to first check tp->urg_data in tcp_poll(), then tp->urg_seq == tp->copied_seq, because tp->urg_seq is located in a different/cold cache line. Signed-off-by: Eric Dumazet <edumazet@google.com>
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