linux-kernel - Re: [PATCH -mm 2/2] remove dma_is

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Message-ID: <20100723161857.GA10447@phenom.dumpdata.com>
Date:	Fri, 23 Jul 2010 12:18:57 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	akpm@...ux-foundation.org, JBottomley@...ell.com,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 2/2] remove dma_is_consistent API

On Thu, Jul 22, 2010 at 08:40:11PM +0900, FUJITA Tomonori wrote:
> Architectures implement dma_is_consistent() in different ways (some
> misinterpret the definition of API in DMA-API.txt). So it hasn't been
> so useful for drivers. We have only one user of the API in
> tree. Unlikely out-of-tree drivers use the API.
> 
> Even if we fix dma_is_consistent() in some architectures, it doesn't
> look useful at all. It was invented long ago for some old systems that
> can't allocate coherent memory at all. It's better to export only APIs
> that are definitely necessary for drivers.
> 
> Let's remove this API.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
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