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

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Message-ID: <Pine.LNX.4.64.0705231153360.7749@localhost.localdomain>
Date:	Wed, 23 May 2007 11:55:25 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	James Bottomley <James.Bottomley@...elEye.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
Subject: Re: [PATCH] [scsi] Remove __GFP_DMA

On Wed, 23 May 2007, James Bottomley wrote:

> I'll defer to Mark on this one.  However, please remember that you
> can't just blindly remove GFP_DMA ... there are some cards which
> require it.
>
> Aacraid is one example ... it has a set of cards that can only DMA
> to 31 bits.  For them, the GFP_DMA is necessary:  The allocation in
> question is a scatterlist, which must be within the device DMA mask.

a question i asked a while back, and still haven't seen an answer for
-- given this in include/linux/gfp.h:

  #define GFP_DMA         __GFP_DMA

is there a qualitative difference between these two macros?  is there
*supposed* to be?  if there isn't, one would think that just one
variation would be sufficient.

rday
-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

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