linux-kernel - Re: [patch] x86: increase CONFIG_NODES

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Message-ID: <20100311132354.GA26600@elte.hu>
Date:	Thu, 11 Mar 2010 14:23:54 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	David Rientjes <rientjes@...gle.com>, Greg KH <gregkh@...e.de>
Cc:	Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] x86: increase CONFIG_NODES_SHIFT max to 10


* David Rientjes <rientjes@...gle.com> wrote:

> Some larger systems require more than 512 nodes, so increase the maximum 
> CONFIG_NODES_SHIFT to 10 for a new max of 1024 nodes.
> 
> This was tested with numa=fake=64M on systems with more than 64GB of RAM. A 
> total of 1022 nodes were initialized.
> 
> Successfully builds with no additional warnings on x86_64 allyesconfig.

Not so here:

drivers/base/node.c:169: error: negative width in bit-field ?<anonymous>?

>  Greg KH has queued up numa-fix-BUILD_BUG_ON-for-node_read_distance.patch
>  for 2.6.35 to fix the build error when CONFIG_NODES_SHIFT is set to 10.
>  See http://lkml.org/lkml/2010/3/10/390

erm. Alas I cannot merge it in the x86 tree without that fix being upstream. 
Why for v2.6.35 - shouldnt that be v2.6.34?

	Ingo
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