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

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Message-ID: <alpine.DEB.2.00.1001201451430.17915@router.home>
Date:	Wed, 20 Jan 2010 14:52:56 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Yinghai Lu <yinghai@...nel.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 Wed, 20 Jan 2010, Yinghai Lu wrote:

> like this, using DIVIDE for all ?

I liked the __round_mask better


> -#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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