linux-kernel - Re: [PATCH 14/16] x86: Unify CPU -> NUMA node mapping between 32 and 64bit

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Message-ID: <alpine.LFD.2.00.1012092244520.2653@localhost6.localdomain6>
Date:	Thu, 9 Dec 2010 22:49:02 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Tejun Heo <tj@...nel.org>
cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, eric.dumazet@...il.com, yinghai@...nel.org,
	brgerst@...il.com, gorcunov@...il.com, penberg@...nel.org
Subject: Re: [PATCH 14/16] x86: Unify CPU -> NUMA node mapping between 32
 and 64bit

On Sat, 27 Nov 2010, Tejun Heo wrote:

> Unlike 64bit, 32bit has been using its own cpu_to_node_map[] for CPU
> -> NUMA node mapping.  Replace it with early_percpu variable
> x86_cpu_to_node_map and share the mapping code with 64bit.
> 
> * USE_PERCPU_NUMA_NODE_ID is now enabled for 32bit too.
> 
> * x86_cpu_to_node_map and numa_set/clear_node() are moved from numa_64
>   to numa.  For now, x86_cpu_to_node_map is initialized with 0 instead
>   of NUMA_NO_NODE.  This is to avoid introducing unexpected behavior

That's true for 32bit only, right? I actually had to dig into the code
to verify this. Please make this clear for the casual reader.

Thanks,

	tglx
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