[src/trunk]: src/sys/dev mm_init: re-enable zero page protection.

[rmind <rmind%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/875c3394b122
branches:  trunk
changeset: 777528:875c3394b122
user:      rmind <rmind%NetBSD.org@localhost>
date:      Tue Feb 21 21:57:06 2012 +0000

description:
mm_init: re-enable zero page protection.

diffstat:

 sys/dev/mm.c |  6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diffs (28 lines):

diff -r 3a46bb900d02 -r 875c3394b122 sys/dev/mm.c
--- a/sys/dev/mm.c      Tue Feb 21 21:09:51 2012 +0000
+++ b/sys/dev/mm.c      Tue Feb 21 21:57:06 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: mm.c,v 1.15 2011/06/16 16:20:28 joerg Exp $    */
+/*     $NetBSD: mm.c,v 1.16 2012/02/21 21:57:06 rmind Exp $    */
 
 /*-
  * Copyright (c) 2002, 2008, 2010 The NetBSD Foundation, Inc.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: mm.c,v 1.15 2011/06/16 16:20:28 joerg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: mm.c,v 1.16 2012/02/21 21:57:06 rmind Exp $");
 
 #include "opt_compat_netbsd.h"
 
@@ -89,9 +89,7 @@
        /* Read-only zero-page. */
        pg = uvm_km_alloc(kernel_map, PAGE_SIZE, 0, UVM_KMF_WIRED|UVM_KMF_ZERO);
        KASSERT(pg != 0);
-#if 0
        pmap_protect(pmap_kernel(), pg, pg + PAGE_SIZE, VM_PROT_READ);
-#endif
        pmap_update(pmap_kernel());
        dev_zero_page = (void *)pg;