linux-kernel - Re: [patch] numa: fix BUILD_BUG_ON for node_read

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Date:	Wed, 10 Mar 2010 15:11:16 -0800
From:	Greg KH <gregkh@...e.de>
To:	David Rientjes <rientjes@...gle.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch] numa: fix BUILD_BUG_ON for node_read_distance

On Wed, Mar 10, 2010 at 03:05:47PM -0800, David Rientjes wrote:
> On Wed, 10 Mar 2010, Greg KH wrote:
> 
> > > node_read_distance() has a BUILD_BUG_ON() to prevent buffer overruns when
> > > the number of nodes printed will exceed the buffer length.
> > > 
> > > Each node only needs four chars: three for distance (maximum distance is
> > > 255) and one for a seperating space or a trailing newline.
> > 
> > Is this causing a problem as-is today that we need to resolve for
> > 2.6.34?  Or is this 2.6.35 material?
> > 
> 
> It's not needed at least for x86 for 2.6.34 since the max 
> CONFIG_NODES_SHIFT is 9.  I don't know about other architectures with 
> different ranges or page sizes.
> 
> I'm going to push a change to the x86 maintainers to increase that max 
> CONFIG_NODES_SHIFT to 10 hopefully for 2.6.35, that's where we run into 
> this error.

Ok, I'll queue this up for .35, thanks.

greg k-h
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