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MLX5_*_DOORBELL_LOCK macros provided a way to avoid locking for mlx5_write64 on 64-bit platforms where it's not necessary. Currently all calls to mlx5_write64 don't use a spinlock, so the macros became unused. Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com> Reviewed-by: Eran Ben Elisha <eranbe@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>