On Tue, Jun 10, 2014 at 03:21:18PM -0600, Keith Busch wrote: > Yeah, nvme_setup_prps is probably the least readable code in this driver. > Maybe some comments are in order here... > > There are two rules for an SGL to be mappable to a PRP: > > 1. Every element must have zero page offset, except the first. > > 2. Every element must end on a page boundary, except the last.
Or to put it another way, NVMe PRPs only support I/Os that describe a single range of virtual memory. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
