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

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Message-Id: <1180018752.3692.16.camel@mulgrave.il.steeleye.com>
Date:	Thu, 24 May 2007 09:59:12 -0500
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	"Salyzyn, Mark" <mark_salyzyn@...ptec.com>
Cc:	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, Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: RE: [PATCH] [scsi] Remove __GFP_DMA

On Thu, 2007-05-24 at 09:24 -0400, Salyzyn, Mark wrote:
> So, is the sequence:
> 
> 	p = kmalloc(upsg->sg[i].count,GFP_KERNEL);
> 	. . .
> 	addr = pci_map_single(dev->pdev, p, upsg->sg[i].count,
> data_dir);
> 
> Going to ensure that we have a 31 bit (not 32 bit) physical address?

No, unfortunately.  Implementing kmalloc_mask() and kmalloc_dev() was
something I said I'd do ... about two years ago.

> If not, then I reject this patch. We can not consider replacement with
> pci_alloc_consistent until it works on AMD respecting the DMA masks.

It should, I believe ... x86_64 has a complex allocation scheme where
for masks < 32 bit it first tries in GFP_DMA32 and sees if it gets lucky
before falling back to GFP_DMA. i386 just goes straight to GFP_DMA.

James


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