linux-kernel - [PATCH 03/12] time: Complete NTP adjustment threshold judging conditions

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Date:	Fri, 21 Nov 2014 11:44:09 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	"pang.xunlei" <pang.xunlei@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	Miroslav Lichvar <mlichvar@...hat.com>,
	Richard Cochran <richardcochran@...il.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	John Stultz <john.stultz@...aro.org>
Subject: [PATCH 03/12] time: Complete NTP adjustment threshold judging conditions

From: "pang.xunlei" <pang.xunlei@...aro.org>

The clocksource mult-adjustment threshold is [mult-maxadj, mult+maxadj],
timekeeping_adjust() only deals with the upper threshold, but misses the
lower threshold.

This patch adds the lower threshold judging condition.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Arnd Bergmann <arnd.bergmann@...aro.org>
Cc: pang.xunlei <pang.xunlei@...aro.org>
Cc: Miroslav Lichvar <mlichvar@...hat.com>
Cc: Richard Cochran <richardcochran@...il.com>
Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Alessandro Zummo <a.zummo@...ertech.it>
Signed-off-by: pang.xunlei <pang.xunlei@...aro.org>
[jstultz: Minor fix for > 80 char line]
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 kernel/time/timekeeping.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index cad61b3..41fcbe1 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1403,7 +1403,8 @@ static void timekeeping_adjust(struct timekeeper *tk, s64 offset)
 	}
 
 	if (unlikely(tk->tkr.clock->maxadj &&
-		(tk->tkr.mult > tk->tkr.clock->mult + tk->tkr.clock->maxadj))) {
+		(abs(tk->tkr.mult - tk->tkr.clock->mult)
+			> tk->tkr.clock->maxadj))) {
 		printk_once(KERN_WARNING
 			"Adjusting %s more than 11%% (%ld vs %ld)\n",
 			tk->tkr.clock->name, (long)tk->tkr.mult,
-- 
1.9.1

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