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

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Date:	Wed, 30 Dec 2009 10:05:19 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Len Brown <lenb@...nel.org>, 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, 30 Dec 2009 16:35:44 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> 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...
> 

Yes, and it still boots now.

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