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Make the peek offset interface safe to use in lockless environments. Use READ_ONCE and WRITE_ONCE to avoid race conditions between testing and updating the peek offset. Suggested-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>