[src/netbsd-7]: src/sys/arch/x86/x86 Pull up following revision(s) (requested...

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

details:   https://anonhg.NetBSD.org/src/rev/789e62174137
branches:  netbsd-7
changeset: 799808:789e62174137
user:      snj <snj%NetBSD.org@localhost>
date:      Fri Feb 26 21:50:54 2016 +0000

description:
Pull up following revision(s) (requested by hannken in ticket #1100):
        sys/arch/x86/x86/pmap.c: revision 1.190
Operation pmap_pp_clear_attrs() may remove the "used" attribute from a page
that is still cached in the TLB of other CPUs.
Call pmap_tlb_shootnow() here before enabling preemption to clear the
TLB entries on other CPUs.
Should prevent tmpfs data corruption under load.
Ok: Chuck Silvers

diffstat:

 sys/arch/x86/x86/pmap.c |  5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diffs (26 lines):

diff -r 9736d047a624 -r 789e62174137 sys/arch/x86/x86/pmap.c
--- a/sys/arch/x86/x86/pmap.c   Fri Feb 26 21:34:27 2016 +0000
+++ b/sys/arch/x86/x86/pmap.c   Fri Feb 26 21:50:54 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: pmap.c,v 1.183.2.3 2016/02/12 10:55:35 snj Exp $       */
+/*     $NetBSD: pmap.c,v 1.183.2.4 2016/02/26 21:50:54 snj Exp $       */
 
 /*-
  * Copyright (c) 2008, 2010 The NetBSD Foundation, Inc.
@@ -171,7 +171,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.183.2.3 2016/02/12 10:55:35 snj Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.183.2.4 2016/02/26 21:50:54 snj Exp $");
 
 #include "opt_user_ldt.h"
 #include "opt_lockdebug.h"
@@ -3867,6 +3867,7 @@
        }
        result = pp->pp_attrs & clearbits;
        pp->pp_attrs &= ~clearbits;
+       pmap_tlb_shootnow();
        kpreempt_enable();
 
        return result != 0;