linux-kernel - Re: [PATCH] [scsi] Remove __GFP

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Date:	Thu, 24 May 2007 11:08:27 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	"Salyzyn, Mark" <mark_salyzyn@...ptec.com>,
	James Bottomley <James.Bottomley@...elEye.com>,
	Aubrey Li <aubreylee@...il.com>,
	Christoph Lameter <clameter@....com>,
	Bernhard Walle <bwalle@...e.de>, linux-scsi@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [scsi] Remove __GFP_DMA

> > That didn't used to work right on the AMD boards when I tried it last as
> > we ended up with a buffer that was mapped by the IOMMU for some reason
> > and that was not below 2GB.
> 
> The physical address you mean? If that is still happening then it needs 
> to get fixed. The allocation should not succeed if it can't provide 
> memory that's inside the DMA mask for the device..

But the allocation can succeed - using GFP_DMA at least you can do it as
you get memory below 2^24 you don't need to map via the IOMMU
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