linux-kernel - Re: [PATCH] Make GFP_DMA allocations w/o ZONE

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Message-ID: <alpine.DEB.2.00.1106011140050.16198@chino.kir.corp.google.com>
Date:	Wed, 1 Jun 2011 11:42:09 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Mel Gorman <mel@....ul.ie>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Make GFP_DMA allocations w/o ZONE_DMA emit a warning
 instead of failing

On Wed, 1 Jun 2011, Dmitry Eremin-Solenikov wrote:

> > So you want to continue to allow the page allocator to return pages from
> > anywhere, even when GFP_DMA is specified, just as though it was lowmem?
> 
> Yes and no. I'm asking for the grace period for the drivers authors to be able
> to fix their code. After a grace period of one or two majors this permission
> should be removed and your original patch should be effective.
> 

You don't need to wait for the code to be fixed, you just need to enable 
CONFIG_ZONE_DMA.  This is a configuration issue.  If that GFP_DMA can be 
removed later, that's great, but right now it requires it.  Why can't you 
enable the config option?
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