linux-kernel - [PATCH 3/8] time: Explicitly use u32 instead of int for shift values

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Date:	Fri, 13 Jul 2012 01:21:52 -0400
From:	John Stultz <john.stultz@...aro.org>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	John Stultz <john.stultz@...aro.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Richard Cochran <richardcochran@...il.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 3/8] time: Explicitly use u32 instead of int for shift values

Ingo noted that using a u32 instead of int for shift values
would be better to make sure the compiler doesn't unnecessarily
use complex signed arithmetic.

CC: Ingo Molnar <mingo@...nel.org>
CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC: Richard Cochran <richardcochran@...il.com>
CC: Prarit Bhargava <prarit@...hat.com>
CC: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 kernel/time/timekeeping.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index c2f12aa..4fd83df 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -28,7 +28,7 @@ struct timekeeper {
 	/* NTP adjusted clock multiplier */
 	u32			mult;
 	/* The shift value of the current clocksource. */
-	int			shift;
+	u32			shift;
 	/* Number of clock cycles in one NTP interval. */
 	cycle_t			cycle_interval;
 	/* Number of clock shifted nano seconds in one NTP interval. */
@@ -45,7 +45,7 @@ struct timekeeper {
 	s64			ntp_error;
 	/* Shift conversion between clock shifted nano seconds and
 	 * ntp shifted nano seconds. */
-	int			ntp_error_shift;
+	u32			ntp_error_shift;
 
 	/* The current time */
 	struct timespec 	xtime;
@@ -960,7 +960,7 @@ static void timekeeping_adjust(s64 offset)
  *
  * Returns the unconsumed cycles.
  */
-static cycle_t logarithmic_accumulation(cycle_t offset, int shift)
+static cycle_t logarithmic_accumulation(cycle_t offset, u32 shift)
 {
 	u64 nsecps = (u64)NSEC_PER_SEC << timekeeper.shift;
 	u64 raw_nsecs;
-- 
1.7.9.5

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