linux-kernel - Re: [PATCH 2/8] Create the ZONE

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Message-ID: <Pine.LNX.4.64.0701260822510.6141@schroedinger.engr.sgi.com>
Date:	Fri, 26 Jan 2007 08:28:37 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Mel Gorman <mel@....ul.ie>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] Create the ZONE_MOVABLE zone

On Thu, 25 Jan 2007, Mel Gorman wrote:

> @@ -166,6 +168,8 @@ enum zone_type {
>  #define ZONES_SHIFT 1
>  #elif __ZONE_COUNT <= 4
>  #define ZONES_SHIFT 2
> +#elif __ZONE_COUNT <= 8
> +#define ZONES_SHIFT 3
>  #else

You do not need a shift of 3. Even with ZONE_MOVABLE the maximum 
number of zones is still 4.

x86_64 has DMA, DMA32, NORMAL, MOVABLE
i386 has DMA, NORMAL, HIGHMEM, MOVABLE

x86_64 is the only platform that has DMA32.
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