linux-kernel - [tip:core/locking] watchdog: Use local_clock for get

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Date:	Fri, 22 Feb 2013 04:23:07 -0800
From:	tip-bot for Namhyung Kim <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	namhyung.kim@....com, namhyung@...nel.org, rostedt@...dmis.org,
	tglx@...utronix.de, dzickus@...hat.com
Subject: [tip:core/locking] watchdog: Use local_clock for get_timestamp()

Commit-ID:  c06b4f1947213cd0902610fafcabac02d49ad728
Gitweb:     http://git.kernel.org/tip/c06b4f1947213cd0902610fafcabac02d49ad728
Author:     Namhyung Kim <namhyung.kim@....com>
AuthorDate: Thu, 27 Dec 2012 11:49:44 +0900
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 19 Feb 2013 08:42:40 +0100

watchdog: Use local_clock for get_timestamp()

The get_timestamp() function is always called with current cpu,
thus using local_clock() would be more appropriate and it makes
the code shorter and cleaner IMHO.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Acked-by: Don Zickus <dzickus@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Link: http://lkml.kernel.org/r/1356576585-28782-1-git-send-email-namhyung@kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/watchdog.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 75a2ab3..082ca68 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -112,9 +112,9 @@ static int get_softlockup_thresh(void)
  * resolution, and we don't need to waste time with a big divide when
  * 2^30ns == 1.074s.
  */
-static unsigned long get_timestamp(int this_cpu)
+static unsigned long get_timestamp(void)
 {
-	return cpu_clock(this_cpu) >> 30LL;  /* 2^30 ~= 10^9 */
+	return local_clock() >> 30LL;  /* 2^30 ~= 10^9 */
 }
 
 static void set_sample_period(void)
@@ -132,9 +132,7 @@ static void set_sample_period(void)
 /* Commands for resetting the watchdog */
 static void __touch_watchdog(void)
 {
-	int this_cpu = smp_processor_id();
-
-	__this_cpu_write(watchdog_touch_ts, get_timestamp(this_cpu));
+	__this_cpu_write(watchdog_touch_ts, get_timestamp());
 }
 
 void touch_softlockup_watchdog(void)
@@ -195,7 +193,7 @@ static int is_hardlockup(void)
 
 static int is_softlockup(unsigned long touch_ts)
 {
-	unsigned long now = get_timestamp(smp_processor_id());
+	unsigned long now = get_timestamp();
 
 	/* Warn about unreasonable delays: */
 	if (time_after(now, touch_ts + get_softlockup_thresh()))
--
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