linux-kernel - Re: [git pull] m68k SLUB fix for 2.6.39

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Date:	Wed, 4 May 2011 12:03:08 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <cl@...ux.com>
cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	James Bottomley <James.Bottomley@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [git pull] m68k SLUB fix for 2.6.39

On Wed, 4 May 2011, Christoph Lameter wrote:

> As i have explained multiple times before: This is a generic issue with a
> kernel configuration that has DISCONTIGMEM on and NUMA configured off.
> Core code in various subsystems makes various assumptions in the !NUMA
> case. F.e. page_to_nid(page) == 0. Slub is one of them.
> 

Agreed, but James is still reporting that there is a slub oops with at 
least parisc even with the N_NORMAL_MEMORY fix applied.  He's currently 
retrying on a clean kernel with the latest git (and presumably 
CONFIG_BROKEN to enable CONFIG_SLUB).  If he reports that slub is no 
longer an issue with such a configuration, then I agree that we can remove 
the Kconfig change for slub so it no longer forces CONFIG_NUMA for 
CONFIG_DISCONTIGMEM (or CONFIG_BROKEN).

If that's the case, and we'll have to wait for James' report back first, 
then we can probably make adjustments in the per-arch Kconfigs that enable 
discontigmem without NUMA and then make it a strict requirement (or 
CONFIG_BROKEN) until the additional problems are solved in other places in 
the kernel.
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