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

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Message-ID: <20110610185858.GN24424@n2100.arm.linux.org.uk>
Date:	Fri, 10 Jun 2011 19:58:58 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	tglx@...utronix.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, mel@....ul.ie,
	kamezawa.hiroyu@...fujitsu.com, riel@...hat.com, pavel@....cz
Subject: Re: [PATCH] Make GFP_DMA allocations w/o ZONE_DMA emit a warning
	instead of failing

On Fri, Jun 10, 2011 at 11:54:16AM -0700, David Rientjes wrote:
> On Fri, 10 Jun 2011, Russell King - ARM Linux wrote:
> 
> > > Should one submit a patch adding a warning to GFP_DMA allocations
> > > w/o ZONE_DMA, or the idea of the original patch is wrong?
> > 
> > Linus was far from impressed by the original commit, saying:
> > | Using GFP_DMA is reasonable in a driver - on platforms where that
> > | matters, it should allocate from the DMA zone, on platforms where it
> > | doesn't matter it should be a no-op.
> > 
> > So no, not even a warning.
> > 
> 
> Any words of wisdom for users with CONFIG_ZONE_DMA=n that actually use 
> drivers where they need GFP_DMA?  The page allocator should just silently 
> return memory from anywhere?

See Linus' reply.  I quote again "on platforms where it doesn't matter it
should be a no-op".  If _you_ have a problem with that _you_ need to
discuss it with _Linus_, not me.  I'm not going to be a middle-man sitting
between two people with different opinions.
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