linux-kernel - Re: [PATCH 22/37] move round

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Message-ID: <4B576F79.9020205@kernel.org>
Date:	Wed, 20 Jan 2010 13:02:49 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 22/37] move round_up/down to kernel.h

On 01/20/2010 12:52 PM, Christoph Lameter wrote:
> On Wed, 20 Jan 2010, Yinghai Lu wrote:
> 
>> like this, using DIVIDE for all ?
> 
> I liked the __round_mask better

how about if y is not pow_of_two ?

> 
> 
>> -#define __round_mask(x,y) ((__typeof__(x))((y)-1))
>> -#define round_up(x,y) ((((x)-1) | __round_mask(x,y))+1)
>> -#define round_down(x,y) ((x) & ~__round_mask(x,y))
>> +#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
>> +#define rounddown(x, y) (((x) / (y)) * (y))
> 
>> +#define round_up(x,y) roundup(x,y)
>> +#define round_down(x,y) rounddown(x,y)
> 
> Why two aliases? Make the use consistent throughout the source.

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