[src/trunk]: src/sys/kern Tiny optimization; timecounters should not go bad ~...

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

details:   https://anonhg.NetBSD.org/src/rev/74d2e4ebf370
branches:  trunk
changeset: 933560:74d2e4ebf370
user:      rin <rin%NetBSD.org@localhost>
date:      Wed May 27 08:47:15 2020 +0000

description:
Tiny optimization; timecounters should not go bad ~ every ticktock.

diffstat:

 sys/kern/kern_tc.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r 32f56932c045 -r 74d2e4ebf370 sys/kern/kern_tc.c
--- a/sys/kern/kern_tc.c        Wed May 27 07:17:45 2020 +0000
+++ b/sys/kern/kern_tc.c        Wed May 27 08:47:15 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: kern_tc.c,v 1.55 2020/05/23 23:42:43 ad Exp $ */
+/* $NetBSD: kern_tc.c,v 1.56 2020/05/27 08:47:15 rin Exp $ */
 
 /*-
  * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
@@ -40,7 +40,7 @@
 
 #include <sys/cdefs.h>
 /* __FBSDID("$FreeBSD: src/sys/kern/kern_tc.c,v 1.166 2005/09/19 22:16:31 andre Exp $"); */
-__KERNEL_RCSID(0, "$NetBSD: kern_tc.c,v 1.55 2020/05/23 23:42:43 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_tc.c,v 1.56 2020/05/27 08:47:15 rin Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_ntp.h"
@@ -1336,7 +1336,7 @@
                return;
        count = 0;
        mutex_spin_enter(&timecounter_lock);
-       if (timecounter_bad != 0) {
+       if (__predict_false(timecounter_bad != 0)) {
                /* An existing timecounter has gone bad, pick a new one. */
                (void)atomic_swap_uint(&timecounter_bad, 0);
                if (timecounter->tc_quality < 0) {