linux-kernel - [PATCH 9/9] time: Explicitly use u32 instead of int for shift values

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Date:	Thu,  1 Mar 2012 23:12:48 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	John Stultz <john.stultz@...aro.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Richard Cochran <richardcochran@...il.com>
Subject: [PATCH 9/9] 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@...e.hu>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Eric Dumazet <eric.dumazet@...il.com>
CC: Richard Cochran <richardcochran@...il.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 kernel/time/timekeeping.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 67983ff..60351a8 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;
 	/* cycle value at last accumulation point */
 	cycle_t			cycle_last;
 	/* Number of clock cycles in one NTP interval. */
@@ -48,7 +48,7 @@ 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;
 	/*
 	 * wall_to_monotonic is what we need to add to xtime (or xtime corrected
 	 * for sub jiffie times) to get to monotonic time.  Monotonic is pegged
@@ -1016,7 +1016,7 @@ static void timekeeping_adjust(struct timekeeper *tk, s64 offset)
  * Returns the unconsumed cycles.
  */
 static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
-						int shift)
+					u32 shift)
 {
 	u64 nsecps = (u64)NSEC_PER_SEC << tk->shift;
 	u64 raw_nsecs;
-- 
1.7.3.2.146.gca209

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