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>

1 files changed, 2 insertions, 5 deletions

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index a614ee10f846..c3fe78406d18 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -679,11 +679,8 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
         /* 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;