linux-kernel - Re: [PATCH 0/3] ARM:dma-mapping:Support DMA-API debugging facility on ARM

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Message-ID: <20090717081149.GB3174@n2100.arm.linux.org.uk>
Date:	Fri, 17 Jul 2009 09:11:49 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	joerg.roedel@....com, linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 0/3] ARM:dma-mapping:Support DMA-API debugging facility
	on ARM

On Fri, Jul 17, 2009 at 08:02:08AM +0800, Ming Lei wrote:
> 2009/7/12  <tom.leiming@...il.com>:
> > Hi,
> > This patch set introduces dma-api debugging facility on ARM, and is
> > against -rc2-next tree.
> >
> 
> Hi, Russell and All,
> 
> Care to give any suggestions or objections on the patches?

I don't think it's suitable, because our implementation calls back into
the DMA API for dma_map_sg() - this means that the debugging code will
end up seeing each scatterlist entry twice.  I'm not sure what effect
that will have, but it's probably not good.
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