linux-kernel - Re: [PATCH RFC] x86: Fix 64-bit DMA masks on VIA

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Message-Id: <20080424.071835.06112189.davem@davemloft.net>
Date:	Thu, 24 Apr 2008 07:18:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mb@...sch.de
Cc:	andi@...stfloor.org, linux-kernel@...r.kernel.org, vojtech@...e.cz,
	muli@...ibm.com, jdmason@...zu.us, tglx@...utronix.de,
	mingo@...hat.com
Subject: Re: [PATCH RFC] x86: Fix 64-bit DMA masks on VIA

From: Michael Buesch <mb@...sch.de>
Date: Thu, 24 Apr 2008 16:06:00 +0200

> Why do we need to workaround this in _every_ driver? (Note that _every_
> driver supporting a 64bit mask is affected). Why not fix it in the DMA layer?

Because the driver has to make a conscious choice of what
DMA mask it wants to use.  Datastructures can change based
upon whether 32-bit or 64-bit DMA is available, etc.

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