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

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Date:	Wed, 23 May 2007 20:38:46 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Salyzyn, Mark" <mark_salyzyn@...ptec.com>
Cc:	"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

On Wed, 23 May 2007 15:17:08 -0400
"Salyzyn, Mark" <mark_salyzyn@...ptec.com> wrote:

> The 31 bit limit for some of these cards is a problem, we currently only
> do __GFP_DMA for bounce buffer sg elements allocated for user supplied
> references in ioctls.
> 
> I figure we should be using pci_alloc_consistent calls for these
> allocations to more accurately acquire memory within the 31 bit limit if
> necessary, we could switch to these to remove the need for the __GFP_DMA
> flag in the aacraid driver?

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.

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