On Thu, Dec 28, 2017 at 10:18:03PM +0800, Yixian Liu wrote: > - hns_roce_write64_k(doorbell, eq->doorbell); > + hns_roce_write64_k(db.doorbell, eq->doorbell); You need to pass &db to hns_roce_write64_k and have it deref the 64 bit value using the union. The point here is to eliminate the cast inside hns_roce_write64_k. Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html