1 files changed, 1 insertions, 1 deletions

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 9259337d7374..9191a66b3bc5 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -239,7 +239,7 @@ void __init paging_init(void)
 
 #ifdef CONFIG_ZONE_DMA
         max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
-                        ((1UL << ARCH_ZONE_DMA_BITS) - 1) >> PAGE_SHIFT);
+                                      1UL << (ARCH_ZONE_DMA_BITS - PAGE_SHIFT));
 #endif
         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 #ifdef CONFIG_HIGHMEM