1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
index 2b865c90b041..116e00f1bb7b 100644
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -804,7 +804,7 @@ static int __init pci_iommu_init(void)
         } 
         
         if (no_iommu ||
-            (!force_iommu && end_pfn < 0xffffffff>>PAGE_SHIFT) ||
+            (!force_iommu && (end_pfn-1) < 0xffffffff>>PAGE_SHIFT) ||
             !iommu_aperture ||
             (no_agp && init_k8_gatt(&info) < 0)) {
                 printk(KERN_INFO "PCI-DMA: Disabling IOMMU.\n");