linux-kernel - Re: [PATCH 0/3] Add API for weak DMA masks

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Date:	Thu, 1 May 2008 11:58:26 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Michael Buesch <mb@...sch.de>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	John Linville <linville@...driver.com>,
	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>, bcm43xx-dev@...ts.berlios.de,
	linux-wireless@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] Add API for weak DMA masks

On Thu, May 01, 2008 at 05:47:26PM +0200, Michael Buesch wrote:
> We've discussed that and this behaviour is not acceptable, as the driver
> must know about a possible fallback in case it can do 32bit DMA
> more efficiently than 64bit DMA, for example.

That's what we have dma_get_required_mask() for.  See
Documentation/DMA-API.txt.

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