On 01/28/2010 01:37 PM, Joerg Roedel wrote:
These two functions provide support for mapping and unmapping physical addresses to io virtual addresses. The difference to the iommu_(un)map_range() is that the new functions take a gfp_order parameter instead of a size. This allows the IOMMU backend implementations to detect easier if a given range can be mapped by larger page sizes. These new functions should replace the old ones in the long term.
These seem to be less flexible in the long term. Sure, it is easier for the backend to map to multiple page sizes if your iommu supports arbitrary power-of-two page sizes, but we should make the APIs easier for the callers, not the backend.
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