x86: max_low_pfn_mapped fix #4

only add direct mapping for aperture

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index a614ee1..c3fe784 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -679,11 +679,8 @@
 	/* need to map that range */
 	end_pfn = (aper_base>>PAGE_SHIFT) + (aper_size>>PAGE_SHIFT);
 	if (end_pfn > max_low_pfn_mapped) {
-		start_pfn = max_low_pfn_mapped;
-		max_low_pfn_mapped = init_memory_mapping(start_pfn<<PAGE_SHIFT,
-							 end_pfn<<PAGE_SHIFT);
-		if (max_pfn_mapped < max_low_pfn_mapped)
-			max_pfn_mapped = max_low_pfn_mapped;
+		start_pfn = (aper_base>>PAGE_SHIFT);
+		init_memory_mapping(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT);
 	}
 	return 0;