> James B. suggests that we stick a WARN_ON() into libata to let us > know if that precondition is violated. Sounds like an easy thing to do > for a couple of -rc cycles someday. If the block layer gives us a 32k block aligned on a 32k boundary (aligned), we have no guarantee that the iommu will not turn that into something unaligned crossing a 32k (and thus possibly a 64k) boundary. On powerpc, the iommu operates on 4k pages and only provides that level of alignment to dma_map_sg() (dma_alloc_coherent are naturally aligned, but not map_sg, that would put way too much pressure on the allocator on machines that have pinhole-sized iommu space). Cheers, Ben. - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
