linux-kernel - Re: ACPI warning from alloc_pages_nodemask on boot (2.6.33 regression)

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Date:	Wed, 30 Dec 2009 16:35:44 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
Cc:	Len Brown <lenb@...nel.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	linux-acpi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: ACPI warning from alloc_pages_nodemask on boot (2.6.33 
 regression)

On Wed, 2009-12-30 at 15:21 +0900, KOSAKI Motohiro wrote:
> >> [    1.630020] ------------[ cut here ]------------
> >> [    1.630026] WARNING: at mm/page_alloc.c:1812 __alloc_pages_nodemask+0x617/0x730()
> >
> >        if (order >= MAX_ORDER) {
> >                WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN));
> >                return NULL;
> >        }
> >
> > I don't know what the mm alloc code is complaining about here.

> >> [    1.630028] Hardware name: System Product Name
> >> [    1.630029] Modules linked in:
> >> [    1.630032] Pid: 1, comm: swapper Not tainted 2.6.33-rc2 #4
> >> [    1.630034] Call Trace:

> >> [    1.630064]  [<ffffffff812cae3e>] acpi_os_allocate+0x25/0x27 

Right, so ACPI is trying to allocate something larger than 2^MAX_ORDER
pages, which on x86 computes to 4K * 2^11 = 8M.

That's not going to work.

Did this machine properly boot before? I seem to remember people working
on moving away from bootmem and getting th page/slab stuff up and
running sooner, it might be fallout from that...

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