linux-kernel - Re: 2.6.28-rc9 panics with crashkernel=256M while booting

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Date:	Mon, 29 Dec 2008 13:36:07 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Chandru <chandru@...ibm.com>, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: 2.6.28-rc9 panics with crashkernel=256M while booting

On Fri, 2008-12-26 at 11:59 +1100, Paul Mackerras wrote:
> 
> > diff -puN arch/powerpc/mm/numa.c~2628-rc9-panics-with-crashkernel=256m-while-booting arch/powerpc/mm/numa.c
> > --- a/arch/powerpc/mm/numa.c~2628-rc9-panics-with-crashkernel=256m-while-booting
> > +++ a/arch/powerpc/mm/numa.c
> > @@ -995,10 +995,11 @@ void __init do_init_bootmem(void)
> >                                 start_pfn, end_pfn);
> >  
> >               free_bootmem_with_active_regions(nid, end_pfn);
> > +     }
> > +
> > +     for_each_online_node(nid) {
> >               /*
> > -              * Be very careful about moving this around.  Future
> > -              * calls to careful_allocation() depend on this getting
> > -              * done correctly.
> > +              * Be very careful about moving this around.
> >                */
> >               mark_reserved_regions_for_nid(nid);
> >               sparse_memory_present_with_active_regions(nid);

I think this reintroduces one of the bugs that I squashed.  You *have*
to call mark_reserved_regions_for_nid() right after you do
free_bootmem_with_active_regions().  Otherwise, someone else can
bootmem_alloc() a reserved region from that node.

Perhaps I need to make that comment a bit more forceful. :)

/*
 * Don't break this loop out.  Period.  Never.  Ever.
 * No, seriously.  Don't do it.  I mean it.  Really!
 */

-- Dave

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