diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index a4cca066c889a..222f5b7561370 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -326,7 +326,7 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
  */
 int devmem_is_allowed(unsigned long pagenr)
 {
-	if (pagenr <= 256)
+	if (pagenr < 256)
 		return 1;
 	if (iomem_is_exclusive(pagenr << PAGE_SHIFT))
 		return 0;