linux-kernel - [PATCH 8/15] arch/m32r: Use DIV_ROUND

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Date:	Sun, 2 Aug 2009 10:47:27 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	takata@...ux-m32r.org, linux-m32r@...linux-m32r.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 8/15] arch/m32r: Use DIV_ROUND_CLOSEST

From: Julia Lawall <julia@...u.dk>

The kernel.h macro DIV_ROUND_CLOSEST performs the computation (x + d/2)/d
but is perhaps more readable.

The semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@haskernel@
@@

#include <linux/kernel.h>

@depends on haskernel@
expression x,__divisor;
@@

- (((x) + ((__divisor) / 2)) / (__divisor))
+ DIV_ROUND_CLOSEST(x,__divisor)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 arch/m32r/kernel/time.c             |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/m32r/kernel/time.c b/arch/m32r/kernel/time.c
index cada3ba..49648ba 100644
--- a/arch/m32r/kernel/time.c
+++ b/arch/m32r/kernel/time.c
@@ -66,7 +66,7 @@ static unsigned long do_gettimeoffset(void)
 		count = 0;
 
 	count = (latch - count) * TICK_SIZE;
-	elapsed_time = (count + latch / 2) / latch;
+	elapsed_time = DIV_ROUND_CLOSEST(count, latch);
 	/* NOTE: LATCH is equal to the "interval" value (= reload count). */
 
 #else /* CONFIG_SMP */
@@ -84,7 +84,7 @@ static unsigned long do_gettimeoffset(void)
 	p_count = count;
 
 	count = (latch - count) * TICK_SIZE;
-	elapsed_time = (count + latch / 2) / latch;
+	elapsed_time = DIV_ROUND_CLOSEST(count, latch);
 	/* NOTE: LATCH is equal to the "interval" value (= reload count). */
 #endif /* CONFIG_SMP */
 #elif defined(CONFIG_CHIP_M32310)
@@ -270,7 +270,7 @@ void __init time_init(void)
 
 		bus_clock = boot_cpu_data.bus_clock;
 		divide = boot_cpu_data.timer_divide;
-		latch = (bus_clock/divide + HZ / 2) / HZ;
+		latch = DIV_ROUND_CLOSEST(bus_clock/divide, HZ);
 
 		printk("Timer start : latch = %ld\n", latch);
 
--
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