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Message-ID: <Pine.LNX.4.64.0705212225590.25388@schroedinger.engr.sgi.com>
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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