linux-kernel - Re: [PATCH 00/20] generic show

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Message-Id: <1216153986.25942.31.camel@nimitz>
Date:	Tue, 15 Jul 2008 13:33:06 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	hannes@...urebad.de, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>, stable@...nel.org
Subject: Re: [PATCH 00/20] generic show_mem() v5

On Tue, 2008-07-15 at 13:22 -0700, Andrew Morton wrote:
> > The sections are 512MB, and you can see 6 valid ones
> > followed by two holes, and then two more valid ones.
> > 
> > Anyway, I believe this patch will fix the oops.
> 
> This looks like it might be suitable.  Can you please test it?

Yup, will do.  It's where I'm sending this email from, so I'll get to it
in a bit. :)

> > ---
> >  arch/x86/mm/pgtable_32.c |    2 ++
> >  1 files changed, 2 insertions(+), 0 deletions(-)
> > 
> > diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c
> > index 369cf06..eb2a480 100644
> > --- a/arch/x86/mm/pgtable_32.c
> > +++ b/arch/x86/mm/pgtable_32.c
> > @@ -37,6 +37,8 @@ void show_mem(void)
> >               for (i = 0; i < pgdat->node_spanned_pages; ++i) {
> >                       if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
> >                               touch_nmi_watchdog();
> > +                     if (!pfn_valid(pgdat->node_start_pfn + i))
> > +                             continue;
> >                       page = pgdat_page_nr(pgdat, i);
> >                       total++;
> >                       if (PageHighMem(page))
> 
> What change caused this oops to turn up now?

Me getting an extra 2GB (up to 4GB) of RAM for my laptop, which caused a
memory hole, which triggers only with SPARSEMEM=y.  Most people probably
don't run with sparsemem or a 32-bit kernel with that much RAM.

-- Dave

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