linux-kernel - Re: Define CONFIG_BOUNCE to avoid useless inclusion of bounce buffer logic.

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Date:	Mon, 21 May 2007 22:27:16 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	jens.axboe@...cle.com
Subject: Re: Define CONFIG_BOUNCE to avoid useless inclusion of bounce buffer
 logic.

On Tue, 22 May 2007, KAMEZAWA Hiroyuki wrote:

> > +config BOUNCE
> > +	def_bool y
> > +	depends on BLOCK && MMU && (ZONE_DMA || HIGHMEM)
> > +
> 
> AFAIK, ppc has only ZONE_DMA and it never needs bounce.
> Is this ok ?

That is wrong. ppc should have ZONE_NORMAL and no ZONE_DMA.
Otherwise you cannot switch off ZONE_DMA and you cannot switch off 
bounce. ZONE_DMA is a zone for exceptional allocs. If you do not have 
those then you only have normal allocs -> ZONE_NORMAL.


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