diff --git a/arch/mips/mm/pgtable.c b/arch/mips/mm/pgtable.c
index 792c6eb442326790b72759d7ca5e8cd433f838af..c93aa6cbcaca5ece41421a2a2661adb5b7e3e669 100644
--- a/arch/mips/mm/pgtable.c
+++ b/arch/mips/mm/pgtable.c
@@ -15,6 +15,8 @@ void show_mem(void)
 	printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
 	pfn = max_mapnr;
 	while (pfn-- > 0) {
+		if (!pfn_valid(pfn))
+			continue;
 		page = pfn_to_page(pfn);
 		total++;
 		if (PageHighMem(page))