Commit 5101730c authored by Yinghai Lu's avatar Yinghai Lu Committed by H. Peter Anvin
Browse files

x86, mm: use pfn_range_is_mapped() with gart 



We are going to map ram only, so under max_low_pfn_mapped,
between 4g and max_pfn_mapped does not mean mapped at all.

Use pfn_range_is_mapped() directly.

Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1353123563-3103-14-git-send-email-yinghai@kernel.org


Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 8eb5779f

arch/x86/kernel/amd_gart_64.c

+2 −3
Original line number Diff line number Diff line
@@ -768,10 +768,9 @@ int __init gart_iommu_init(void) 
	aper_base	= info.aper_base;

	end_pfn		= (aper_base>>PAGE_SHIFT) + (aper_size>>PAGE_SHIFT);



	if (end_pfn > max_low_pfn_mapped) {

		start_pfn = (aper_base>>PAGE_SHIFT);

	start_pfn = PFN_DOWN(aper_base);

	if (!pfn_range_is_mapped(start_pfn, end_pfn))

		init_memory_mapping(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT);

	}



	pr_info("PCI-DMA: using GART IOMMU.\n");

	iommu_size = check_iommu_size(info.aper_base, aper_size);

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