linux-kernel - Re: [patch 6/6] slab: only define SLAB_CACHE_DMA for CONFIG_ZONE

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Message-ID: <alpine.DEB.2.00.1105251001130.23309@router.home>
Date:	Wed, 25 May 2011 10:02:45 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
cc:	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [patch 6/6] slab: only define SLAB_CACHE_DMA for
 CONFIG_ZONE_DMA

On Wed, 25 May 2011, Heiko Carstens wrote:

> Ok, now I see what you want. But please let's don't add an
> #ifdef CONFIG_ZONE_DMA
> to the dasd driver. Instead just re-add ZONE_DMA to 31-bit s390. Everything
> would be in ZONE_DMA again and ZONE_NORMAL would be empty. Doesn't matter
> if we have an additional zone, since 31-bit support isn't important anymore.

ZONE_NORMAL is normal memory. ZONE_DMA is a zone for memory restricted
to a certain range. If you remove a zone then it should be ZONE_DMA. The
core creates additional (and useless logic in you case) if you enable
ZONE_DMA.

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