linux-kernel - Re: [PATCH 4/15] arch/arm/mach-ep93xx: Use DIV_ROUND

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Date:	Mon, 03 Aug 2009 08:37:52 +1200
From:	Ryan Mallon <ryan@...ewatersys.com>
To:	Julia Lawall <julia@...u.dk>
CC:	hsweeten@...ionengravers.com,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 4/15] arch/arm/mach-ep93xx: Use DIV_ROUND_CLOSEST

Julia Lawall wrote:
> 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/)

I had a read through the website, that's a very neat tool.

> 
> // <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/arm/mach-ep93xx/core.c         |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
> index 4075529..16b92c3 100644
> --- a/arch/arm/mach-ep93xx/core.c
> +++ b/arch/arm/mach-ep93xx/core.c
> @@ -82,7 +82,7 @@ void __init ep93xx_map_io(void)
>   */
>  static unsigned int last_jiffy_time;
>  
> -#define TIMER4_TICKS_PER_JIFFY		((CLOCK_TICK_RATE + (HZ/2)) / HZ)
> +#define TIMER4_TICKS_PER_JIFFY		DIV_ROUND_CLOSEST(CLOCK_TICK_RATE, HZ)
>  
>  static irqreturn_t ep93xx_timer_interrupt(int irq, void *dev_id)
>  {

Acked-by: Ryan Mallon <ryan@...ewatersys.com>

Can you please apply to the ARM patch system
(http://www.arm.linux.org.uk/developer/patches/) unless someone else is
picking this up.

~Ryan

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