linux-kernel - Re: [PATCH] pci: print out DMA mask info

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Date:	Fri, 10 Oct 2008 10:33:51 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Yinghai Lu <yinghai@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	grundler@...isc-linux.org, mingo@...e.hu, tglx@...utronix.de,
	hpa@...or.com, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci: print out DMA mask info

On Fri, Oct 10, 2008 at 09:19:08AM -0700, Yinghai Lu wrote:
> anyway looking at dma_mask print out is interesting..., some uses 39,
> and some use 44bits...

Yes, that reflects the limitations of the device.  You can see many of
the common ones in include/linux/dma-mapping.h.

By the way, commit 8f286c33f1e838d631f4a3260b33efce4bc5973c is a really
bad idea.  It is very helpful to see which bitmasks are used by real
devices, and which ones aren't.  It should be reverted, IMO.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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