linux-kernel - Re: [PATCH 02/91] slub: fix panic with DISCONTIGMEM

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Message-ID: <alpine.DEB.2.00.1202061358170.3817@chino.kir.corp.google.com>
Date:	Mon, 6 Feb 2012 13:58:56 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Willy Tarreau <w@....eu>
cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Pekka Enberg <penberg@...nel.org>,
	James Bottomley <James.Bottomley@...e.de>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 02/91] slub: fix panic with DISCONTIGMEM

On Sun, 5 Feb 2012, Willy Tarreau wrote:

> commit 4a5fa3590f09999f6db41bc386bce40848fa9f63 upstream.
> 
> Slub makes assumptions about page_to_nid() which are violated by
> DISCONTIGMEM and !NUMA.  This violation results in a panic because
> page_to_nid() can be non-zero for pages in the discontiguous ranges and
> this leads to a null return by get_node().  The assertion by the
> maintainer is that DISCONTIGMEM should only be allowed when NUMA is also
> defined.  However, at least six architectures: alpha, ia64, m32r, m68k,
> mips, parisc violate this.  The panic is a regression against slab, so
> just mark slub broken in the problem configuration to prevent users
> reporting these panics.
> 
> Acked-by: David Rientjes <rientjes@...gle.com>
> Acked-by: Pekka Enberg <penberg@...nel.org>
> Signed-off-by: James Bottomley <James.Bottomley@...e.de>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

The problem that this patch initially addressed is fixed by the next patch 
in your series, "set memory ranges in N_NORMAL_MEMORY when onlined", so I 
don't think this one should be merged.
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