diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index f92bdb9f4e46..ae9b84cae57c 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -653,7 +653,9 @@ void __init init_mem_mapping(void)
  */
 int devmem_is_allowed(unsigned long pagenr)
 {
-	if (page_is_ram(pagenr)) {
+	if (region_intersects(PFN_PHYS(pagenr), PAGE_SIZE,
+				IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE)
+			!= REGION_DISJOINT) {
 		/*
 		 * For disallowed memory regions in the low 1MB range,
 		 * request that the page be shown as all zeros.