intel-iommu: Clean up iommu_domain_identity_map()

				     unsigned long long start,

				     unsigned long long end)

{

	unsigned long size;

	unsigned long long base;

	unsigned long first_vpfn = start >> VTD_PAGE_SHIFT;

	unsigned long last_vpfn = end >> VTD_PAGE_SHIFT;

	/* The address might not be aligned */

	base = start & PAGE_MASK;

	size = end - base;

	size = PAGE_ALIGN(size);

	if (!reserve_iova(&domain->iovad, IOVA_PFN(base),

			IOVA_PFN(base + size) - 1)) {

	if (!reserve_iova(&domain->iovad, dma_to_mm_pfn(first_vpfn),

			  dma_to_mm_pfn(last_vpfn))) {

		printk(KERN_ERR "IOMMU: reserve iova failed\n");

		return -ENOMEM;

	}

	pr_debug("Mapping reserved region %lx@%llx for domain %d\n",

		 size, base, domain->id);

	pr_debug("Mapping reserved region %llx-%llx for domain %d\n",

		 start, end, domain->id);

	/*

	 * RMRR range might have overlap with physical memory range,

	 * clear it first

	 */

	dma_pte_clear_range(domain, base >> VTD_PAGE_SHIFT,

			    (base + size - 1) >> VTD_PAGE_SHIFT);

	dma_pte_clear_range(domain, first_vpfn, last_vpfn);

	return domain_pfn_mapping(domain, base >> VTD_PAGE_SHIFT,

				  base >> VTD_PAGE_SHIFT,

				  size >> VTD_PAGE_SHIFT,

	return domain_pfn_mapping(domain, first_vpfn, first_vpfn,

				  last_vpfn - first_vpfn + 1,

				  DMA_PTE_READ|DMA_PTE_WRITE);

}