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x86, mm: use pfn_range_is_mapped() with gart

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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: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1353123563-3103-14-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Yinghai Lu 2012-11-16 19:38:50 -08:00 committed by H. Peter Anvin
parent 8eb5779f6b
commit 5101730cb0
1 changed files with 2 additions and 3 deletions
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5
arch/x86/kernel/amd_gart_64.c
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@ -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);