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a753358472
io_uring keeps a reference to ubuf_info during submission, so if tcp_sendmsg_locked() sees msghdr::msg_ubuf in can be sure the buffer will be kept alive and doesn't need to additionally pin it. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>