1 files changed, 1 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/44x/currituck.c b/arch/powerpc/platforms/44x/currituck.c
index 583e67fee37e..9f6c33d63a42 100644
--- a/arch/powerpc/platforms/44x/currituck.c
+++ b/arch/powerpc/platforms/44x/currituck.c
@@ -160,7 +160,7 @@ static void __init ppc47x_setup_arch(void)
         /* No need to check the DMA config as we /know/ our windows are all of
          * RAM.  Lets hope that doesn't change */
 #ifdef CONFIG_SWIOTLB
-        if (memblock_end_of_DRAM() > 0xffffffff) {
+        if ((memblock_end_of_DRAM() - 1) > 0xffffffff) {
                 ppc_swiotlb_enable = 1;
                 set_pci_dma_ops(&swiotlb_dma_ops);
                 ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;