linux-kernel - Re: [PATCH 2.6.22.y] ieee1394: revert "sbp2: enforce 32bit DMA mapping"

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Message-Id: <1186439529.938.95.camel@localhost.localdomain>
Date:	Tue, 07 Aug 2007 08:32:09 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Stefan Richter <stefanr@...6.in-berlin.de>,
	Olaf Hering <olh@...e.de>, linuxppc-dev@...abs.org,
	stable@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.22.y] ieee1394: revert "sbp2: enforce
	32bit	DMA	mapping"

On Mon, 2007-08-06 at 16:25 -0600, Robert Hancock wrote:
> > Anyway.  For now I will simply go with what 2.6.23-rc has and what
> > 2.6.21 had:  No dma_set_mask anywhere in the 1394 subsystem.  We can
> > revisit this whenever an actual need arises.
> 
> Not sure this is a very good idea. This seems rather likely to fail on
> x86_64 machines with >4GB of RAM for example.. 

Would it ? Isn't the default DMA mask for PCI devices set to 32 bits
anyway ? In which case, swiotlb will take care of the matter.

Cheers,
Ben.


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