iommu/amd: Optimize iommu_unmap_page for new fetch_pte interface
Now that fetch_pte returns the page-size of the pte, this function can be optimized a lot. Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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