linux-kernel - [RFC][PATCH 2/5] time: Fix abs() usage with 64-bit values.

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Date:	Mon, 14 Sep 2015 18:05:21 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	John Stultz <john.stultz@...aro.org>,
	Prarit Bhargava <prarit@...hat.com>,
	Richard Cochran <richardcochran@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [RFC][PATCH 2/5] time: Fix abs() usage with 64-bit values.

This patch fixes a usage of abs() with a 64-bit value which could
truncate the result to 32-bits, by replacing it with abs64().

In this case, its unlikely any issue could have been caused by
this, since we're calculating a second delta, which wouldn't be
larger then 32-bit.

Cc: Prarit Bhargava <prarit@...hat.com>
Cc: Richard Cochran <richardcochran@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 kernel/time/timekeeping.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 3739ac6..3172823f 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1464,7 +1464,7 @@ int timekeeping_suspend(void)
 		 */
 		delta = timespec64_sub(tk_xtime(tk), timekeeping_suspend_time);
 		delta_delta = timespec64_sub(delta, old_delta);
-		if (abs(delta_delta.tv_sec) >= 2) {
+		if (abs64(delta_delta.tv_sec) >= 2) {
 			/*
 			 * if delta_delta is too large, assume time correction
 			 * has occurred and set old_delta to the current delta.
-- 
1.9.1

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