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

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Message-ID: <20100311140623.GA9346@suse.de>
Date:	Thu, 11 Mar 2010 06:06:23 -0800
From:	Greg KH <gregkh@...e.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	David Rientjes <rientjes@...gle.com>,
	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

On Thu, Mar 11, 2010 at 02:23:54PM +0100, Ingo Molnar wrote:
> 
> * 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

Well, it will be a few days before I queue it up...

> 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?

If it needs to go in before .35, or it should go through Ingo's trees, I
have no objection.

thanks,

greg k-h
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