1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
index 1faae5fc1c01..5337ca0ea7b9 100644
--- a/arch/x86_64/mm/init.c
+++ b/arch/x86_64/mm/init.c
@@ -424,7 +424,7 @@ void __init mem_init(void)
 
 #ifdef CONFIG_SWIOTLB
         if (!iommu_aperture &&
-            (end_pfn >= 0xffffffff>>PAGE_SHIFT || force_iommu))
+            ((end_pfn-1) >= 0xffffffff>>PAGE_SHIFT || force_iommu))
                swiotlb = 1;
         if (swiotlb)
                 swiotlb_init();