MLX4_INIT_DOORBELL_LOCK   52 include/linux/mlx4/doorbell.h #define MLX4_INIT_DOORBELL_LOCK(ptr)    do { } while (0)
MLX4_INIT_DOORBELL_LOCK   70 include/linux/mlx4/doorbell.h #define MLX4_INIT_DOORBELL_LOCK(ptr)     spin_lock_init(ptr)