[src/trunk]: src/sys/arch/arm/arm32 fix: Cortex delay() shorten rarely.

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

details:   https://anonhg.NetBSD.org/src/rev/9b17dc3297e4
branches:  trunk
changeset: 809977:9b17dc3297e4
user:      knakahara <knakahara%NetBSD.org@localhost>
date:      Thu Aug 13 02:25:07 2015 +0000

description:
fix: Cortex delay() shorten rarely.

diffstat:

 sys/arch/arm/arm32/cortex_pmc.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 4c2839a3920b -r 9b17dc3297e4 sys/arch/arm/arm32/cortex_pmc.c
--- a/sys/arch/arm/arm32/cortex_pmc.c   Wed Aug 12 21:56:27 2015 +0000
+++ b/sys/arch/arm/arm32/cortex_pmc.c   Thu Aug 13 02:25:07 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cortex_pmc.c,v 1.3 2015/02/08 13:51:23 skrll Exp $     */
+/*     $NetBSD: cortex_pmc.c,v 1.4 2015/08/13 02:25:07 knakahara Exp $ */
 
 /* Copyright (c) 2007 Microsoft
  * All rights reserved.
@@ -35,7 +35,7 @@
  */
 
 #include <sys/cdefs.h>
-/* __KERNEL_RCSID(0, "$NetBSD: cortex_pmc.c,v 1.3 2015/02/08 13:51:23 skrll Exp $"); */
+/* __KERNEL_RCSID(0, "$NetBSD: cortex_pmc.c,v 1.4 2015/08/13 02:25:07 knakahara Exp $"); */
 #include "opt_perfctrs.h"
 #include <sys/types.h>
 #include <sys/param.h>
@@ -103,7 +103,7 @@
                if (ctrl & CORTEX_CNTOFL_C) {
                  /* Reset overflow flag for cycle counter in overflow register */
                        armreg_pmovsr_write(CORTEX_CNTOFL_C);
-                       delta += (last + (counts_per_wrap - cur));
+                       delta += (cur + (counts_per_wrap - last));
                } else {
                        delta += (cur - last);
                }