linux-kernel - Re: [PATCH 24/25] r/o bind mounts: track number of mount writers

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Message-Id: <1190736639.26982.279.camel@localhost>
Date:	Tue, 25 Sep 2007 09:10:39 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, hch@...radead.org
Subject: Re: [PATCH 24/25] r/o bind mounts: track number of mount writers

On Mon, 2007-09-24 at 16:15 -0700, Andrew Morton wrote:
> On Mon, 24 Sep 2007 16:05:37 -0700
> Dave Hansen <haveblue@...ibm.com> wrote:
> 
> > On Mon, 2007-09-24 at 15:25 -0700, Andrew Morton wrote:
> > > hm.  I saw that warning on my 2-way.  It has CONFIG_NR_CPUS=8 so perhaps
> > > the kernel has decided that this machine can possibly have eight CPUs.
> > > 
> > > It's an old super-micro board, doesn't have ACPI.
> > 
> > Well, it's looking like we only set cpu_possible_map from data we find
> > in the MP table, which makes sense.  The only question is how your
> > system gets more than ~8 possible cpus.  Do you have the .config handy?
> 
> http://userweb.kernel.org/~akpm/config-vmm.txt

I've reproduced this.  I'll do more runtime testing with all of the
debugging, CONFIG_CPU_HOTPLUG=y, and NR_CPUS to a high value.  It should
help catch things like this in the future.  

-- Dave

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