[MIPS] sparsemem: fix crash in show_mem

With sparsemem, pfn should be checked by pfn_valid() before pfn_to_page().

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/mm/pgtable.c b/arch/mips/mm/pgtable.c
index 792c6eb442326790b72759d7ca5e8cd433f838af..c93aa6cbcaca5ece41421a2a2661adb5b7e3e669 100644 (file)
--- 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))