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

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Message-Id: <20070522133906.ae9c362a.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 22 May 2007 13:39:06 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Christoph Lameter <clameter@....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 Mon, 21 May 2007 21:03:40 -0700 (PDT)
Christoph Lameter <clameter@....com> wrote:

> The bounce buffer logic is included on systems that do not need it.
> If a system does not have zones like ZONE_DMA and ZONE_HIGHMEM that
> can lead to the use of bounce buffers then there is no need to reserve 
> memory pools etc etc. This is true f.e. for SGI Altix.

> +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 ?

-Kame

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