linux-kernel - Re: [PATCH] dma-debug: disable DMA_API

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Date:	Sat, 13 Jun 2009 19:34:51 +0200
From:	Joerg Roedel <joro@...tes.org>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
Cc:	Joerg Roedel <joerg.roedel@....com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Linus Torvalds <torvalds@...ux-foundation.org>, mingo@...e.hu,
	lethal@...ux-sh.org, hancockrwd@...il.com, jens.axboe@...cle.com,
	bharrosh@...asas.com, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: [PATCH] dma-debug: disable DMA_API_DEBUG for now

On Sat, Jun 13, 2009 at 04:26:06PM +0200, Torsten Kaiser wrote:
> On Sat, Jun 13, 2009 at 1:10 PM, Joerg Roedel<joro@...tes.org> wrote:
> >
> > paddr shouldn't matter. We also can't compare against it because it is
> > not a parameter we get in the unmap path (not always).
> 
> check_unmap() checks it and sg_call_ents are also optional.

check_unmap() only checks it for coherent mappings (where it makes
sense). But for a best-fit search it does not make sense because we
already check for the type and multiple coherent mappings to the same
dma_addr for the same device are not possible (because for coherent
mappings the memory is allocated by the dma_ops backend).

Joerg
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