linux-kernel - Re: [PATCH] [condingstyle] Add chapter on tests

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Date:	Sun, 27 May 2007 23:01:46 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
cc:	Auke Kok <auke-jan.h.kok@...el.com>, randy.dunlap@...cle.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [condingstyle] Add chapter on tests

On Sat, 26 May 2007, Jan Engelhardt wrote:

> +Testing for a flag, as done in the following example, is redundant and
> +can be shortened.
> +
> +	if ((v & GFP_KERNEL) == GFP_KERNEL)
> +		return;
> +
> +should become
> +
> +	if (v & GFP_KERNEL)
> +		return;

This looks wrong to me. These two are only equivalent if the "flag" only 
has 1 bit. And already here you fall into this trap:

#define GFP_KERNEL	(__GFP_WAIT | __GFP_IO | __GFP_FS)

Thanks
Guennadi
---
Guennadi Liakhovetski
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