linux-kernel - Re: [PATCH] fix round

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Date:	Wed, 01 Jul 2009 12:39:35 -0700
From:	Joe Perches <joe@...ches.com>
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>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mikael Pettersson <mikpe@...uu.se>,
	Matthew Wilcox <matthew@....cx>,
	Grant Grundler <grundler@...isc-linux.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] fix round_up/down

On Wed, 2009-07-01 at 12:33 -0700, Yinghai Lu wrote:
> --- linux-2.6.orig/include/linux/kernel.h
> +++ linux-2.6/include/linux/kernel.h
[]
>  #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
> +#define rounddown(x, y) (((x) / (y)) * (y))
[]
> +#define round_up(x,y) ((((x)-1) | __round_mask(x,y))+1)
> +#define round_down(x,y) ((x) & ~__round_mask(x,y))

Isn't this just asking for trouble?

How about a better name?
Maybe masked_roundup, or roundup_ala_zorro...

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