x86-32, mm: The WP test should be done on a kernel page

PAGE_READONLY includes user permission, but this is a page used
exclusively by the kernel; use PAGE_KERNEL_RO instead.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-3-git-send-email-hpa@linux.intel.com

diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 575d86f..e537b35 100644 (file)
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -712,7 +712,7 @@ static void __init test_wp_bit(void)
   "Checking if this processor honours the WP bit even in supervisor mode...");
 
        /* Any page-aligned address will do, the test is non-destructive */
-       __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_READONLY);
+       __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_KERNEL_RO);
        boot_cpu_data.wp_works_ok = do_test_wp_bit();
        clear_fixmap(FIX_WP_TEST);