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[src/trunk]: src/sys/arch/x86/x86 Operation pmap_pp_clear_attrs() may remove ...
details: https://anonhg.NetBSD.org/src/rev/70b6895432d3
branches: trunk
changeset: 813387:70b6895432d3
user: hannken <hannken%NetBSD.org@localhost>
date: Tue Jan 26 14:34:50 2016 +0000
description:
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 cc962f45b028 -r 70b6895432d3 sys/arch/x86/x86/pmap.c
--- a/sys/arch/x86/x86/pmap.c Tue Jan 26 14:08:58 2016 +0000
+++ b/sys/arch/x86/x86/pmap.c Tue Jan 26 14:34:50 2016 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.c,v 1.189 2015/11/11 08:20:22 skrll Exp $ */
+/* $NetBSD: pmap.c,v 1.190 2016/01/26 14:34:50 hannken Exp $ */
/*-
* Copyright (c) 2008, 2010 The NetBSD Foundation, Inc.
@@ -171,7 +171,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.189 2015/11/11 08:20:22 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.190 2016/01/26 14:34:50 hannken Exp $");
#include "opt_user_ldt.h"
#include "opt_lockdebug.h"
@@ -3746,6 +3746,7 @@
}
result = pp->pp_attrs & clearbits;
pp->pp_attrs &= ~clearbits;
+ pmap_tlb_shootnow();
kpreempt_enable();
return result != 0;
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