linux-kernel - Re: [patch] x86: allow ZONE

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Date:	Thu, 21 Oct 2010 09:56:29 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	David Rientjes <rientjes@...gle.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Casey Dahlin <cdahlin@...hat.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] x86: allow ZONE_DMA to be configurable

On Fri, 15 Oct 2010, David Rientjes wrote:

> > hm.  It'd be better to make all the drivers depend on ZONE_DMA.  Good
> > luck with that :)
> >
>
> If they all truly depended on it then we'd never have been able to disable
> it.  I think breaking the build when you have CONFIG_ZONE_DMA=n and
> something is passing GFP_DMA would be the best alternative.

Yes I also think that is best. Forces the issues to be finally addressed.

Building without CONFIG_ZONE_DMA will remove the need to keep dma kmalloc
caches around and avoid checking for __GFP_DMA in the hotpaths of the slab
allocators.
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