linux-kernel - Re: Next April 28: boot failure on PowerPC with SLQB

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Message-Id: <1241090429.19252.7.camel@penberg-laptop>
Date:	Thu, 30 Apr 2009 14:20:29 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Sachin Sant <sachinp@...ibm.com>, linuxppc-dev@...abs.org,
	linux-next@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: Next April 28: boot failure on PowerPC with SLQB

On Thu, 2009-04-30 at 13:18 +0200, Nick Piggin wrote:
> OK thanks. So I think we have 2 problems. One with MAX_ORDER <= 9
> that is fixed by the previous patch, and another which is probably
> due to having no memory on node 0 which I will take another look
> at now.
> 
> We can merge the previous patch now, though.

Hmm, I'll bet this BUG_ON triggers for Stephen.

diff --git a/mm/slqb.c b/mm/slqb.c
index a651843..e4b3859 100644
--- a/mm/slqb.c
+++ b/mm/slqb.c
@@ -1391,6 +1391,7 @@ static noinline void *__slab_alloc_page(struct kmem_cache *s,
 		struct kmem_cache_node *n;
 
 		n = s->node_slab[slqb_page_to_nid(page)];
+		BUG_ON(!n);
 		l = &n->list;
 		page->list = l;
 


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