linux-kernel - Re: Problem with DMA on x86

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Message-ID: <20061121200447.25152d2e@localhost.localdomain>
Date:	Tue, 21 Nov 2006 20:04:47 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Andi Kleen <ak@...e.de>
Cc:	Larry Finger <Larry.Finger@...inger.net>,
	Ray Lee <ray-lk@...rabbit.org>, linux-kernel@...r.kernel.org
Subject: Re: Problem with DMA on x86_64 with 3 GB RAM

> If it did like you're recommending a huge number of drivers
> in the tree wouldn't work anymore (just think about what pci_alloc_consistent
> does) 

There are very few drivers who actually request less than 32bit DMA
and those would (and should) fail or be forced to do their own fallbacks.

Alan
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