diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c
index 1f3cc3d92d3d9df87e304ab9d994d61f48c9afe8..8837d511710afc1bca4a6e0356d6060e2238c08a 100644
--- a/arch/sh/mm/mmap.c
+++ b/arch/sh/mm/mmap.c
@@ -17,7 +17,7 @@
  */
 int valid_phys_addr_range(unsigned long addr, size_t count)
 {
-	if (addr < (PAGE_OFFSET + (PFN_START << PAGE_SHIFT)))
+	if (addr < __MEMORY_START)
 		return 0;
 	if (addr + count > __pa(high_memory))
 		return 0;