linux-kernel - Re: [RFC][PATCH] add dma_reserve_coherent_memory()/dma_free_reserved

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Message-Id: <20100826185102I.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 26 Aug 2010 18:51:48 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	g.liakhovetski@....de
Cc:	fujita.tomonori@....ntt.co.jp, mitov@...p.bas.bg,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	akpm@...ux-foundation.org, linux-arm-kernel@...ts.infradead.org,
	linux-sh@...r.kernel.org, u.kleine-koenig@...gutronix.de,
	philippe.retornaz@...l.ch, gregkh@...e.de, jkrzyszt@....icnet.pl
Subject: Re: [RFC][PATCH] add
 dma_reserve_coherent_memory()/dma_free_reserved_memory() API

On Thu, 26 Aug 2010 11:45:58 +0200 (CEST)
Guennadi Liakhovetski <g.liakhovetski@....de> wrote:

> On Thu, 26 Aug 2010, FUJITA Tomonori wrote:
> 
> > Why can't you revert a commit that causes the regression?
> 
> See this reply, and the complete thread too.
> 
> http://marc.info/?l=linux-sh&m=128130485208262&w=2
> 
> > The related DMA API wasn't changed in 2.6.36-rc1. The DMA API is not
> > responsible for the regression. And the patchset even exnteds the
> > definition of the DMA API (dma_declare_coherent_memory). Such change
> > shouldn't applied after rc1. I think that DMA-API.txt says that
> > dma_declare_coherent_memory() handles coherent memory for a particular
> > device. It's not for the API that reserves coherent memory that can be
> > used for any device for a single device.
> 
> Anyway, we need a way to fix the regression.

Needs to find a different way.
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