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

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Message-Id: <1180026917.3692.47.camel@mulgrave.il.steeleye.com>
Date:	Thu, 24 May 2007 12:15:17 -0500
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	Christoph Lameter <clameter@....com>
Cc:	"Salyzyn, Mark" <mark_salyzyn@...ptec.com>,
	Aubrey Li <aubreylee@...il.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 10:00 -0700, Christoph Lameter wrote:
> On Thu, 24 May 2007, James Bottomley wrote:
> 
> > > 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.
> 
> Tell me more about these ideas. 

Oh, it was this Kernel Summit presentation which discussed it

http://licensing.steeleye.com/support/papers/kernel_summit_iommu.pdf

The writeup of the session is here:

http://lwn.net/Articles/144100/

The idea was basically to match an allocation to a device mask.  I was
going to do a generic implementation (which would probably kmalloc,
check the physaddr and fall back to GFP_DMA if we were unlucky) but
allow the architectures to override.

However, the majority of need (except for the aacraid like devices) was
solved by GFP_DMA32

James


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