linux-kernel - Re: [Linaro-mm-sig] [RFC] ARM DMA mapping TODO, v1

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Date:	Thu, 28 Apr 2011 15:34:40 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	'Benjamin Herrenschmidt' <benh@...nel.crashing.org>,
	linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [Linaro-mm-sig] [RFC] ARM DMA mapping TODO, v1

On Thu, Apr 28, 2011 at 04:29:52PM +0200, Arnd Bergmann wrote:
> Given that people still want to have an interface that does what I
> though this one did, I guess we have two options:
> 
> * Kill off dma_cache_sync and replace it with calls to dma_sync_*
>   so we can start using dma_alloc_noncoherent on ARM

I don't think this is an option as dma_sync_*() is part of the streaming
DMA mapping API (dma_map_*) which participates in the idea of buffer
ownership, which the noncoherent API doesn't appear to.
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