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Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones poi

from [Andi Kleen] [Permanent Link][Original]
To: Ralf Baechle <ralf@linux-mips.org>
Subject: Re: [PATCH 3/4] Embed zone_id information within the zonelist->zones pointer
From: Andi Kleen <ak@suse.de>
Date: Wed, 15 Aug 2007 14:59:20 +0200
Cc: Andi Kleen <ak@suse.de>, Alan Cox <alan@lxorguk.ukuu.org.uk>, Christoph Lameter <clameter@sgi.com>, Mel Gorman <mel@skynet.ie>, Lee.Schermerhorn@hp.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-mips@linux-mips.org
In-reply-to: <20070815113749.GA5862@linux-mips.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20070813225841.GG3406@bingen.suse.de> <Pine.LNX.4.64.0708131506030.28502@schroedinger.engr.sgi.com> <20070813230801.GH3406@bingen.suse.de> <Pine.LNX.4.64.0708131536340.29946@schroedinger.engr.sgi.com> <20070813234322.GJ3406@bingen.suse.de> <Pine.LNX.4.64.0708131553050.30626@schroedinger.engr.sgi.com> <20070814000041.GL3406@bingen.suse.de> <20070814002223.2d8d42c5@the-village.bc.nu> <20070814001441.GN3406@bingen.suse.de> <20070815113749.GA5862@linux-mips.org>
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On Wed, Aug 15, 2007 at 12:37:49PM +0100, Ralf Baechle wrote:
> On Tue, Aug 14, 2007 at 02:14:41AM +0200, Andi Kleen wrote:
> 
> > meth is only used on SGI O2s which are not that slow and unlikely
> > to work in tree anyways.
> 
> O2 doesn't enable CONFIG_ZONE_DMA so there is no point in using GFP_DMA in
> an O2-specific device driver.  Will send out patch in separate mail.

Great.

BTW I suspect this is true for some other GFP_DMA usages too.
Some driver writers seem to confuse it with the PCI DMA
APIs or believe it is always needed for them.

-Andi
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