On Mon, Dec 07, 2015 at 03:43:06PM -0500, Dennis Dalessandro wrote: > + > +#define BAD_DMA_ADDRESS ((u64)0) What is the advantage in using directly u64 values instead of pointers? You will get NULL and functions which return pointers without need of casting. ... > +static u64 rvt_dma_map_single(struct ib_device *dev, void *cpu_addr, > + size_t size, enum dma_data_direction direction) > +{ > + if (WARN_ON(!valid_dma_direction(direction))) > + return BAD_DMA_ADDRESS; > + > + return (u64)cpu_addr; > +} An example of such function. -- 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