linux-kernel - Re: [PATCH 25/35] move round

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Date:	Sat, 13 Feb 2010 10:49:40 -0800
From:	Joe Perches <joe@...ches.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 25/35] move round_up/down to kernel.h

On Wed, 2010-02-10 at 01:20 -0800, Yinghai Lu wrote:
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 1221d23..7f07074 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -44,6 +44,16 @@ extern const char linux_proc_banner[];
[]
> +#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 FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
>  #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
>  #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))

Having both roundup and round_up in kernel.h is a 
near guarantee for a future incorrect use.

Can't you use a different name for this?

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