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

From: Dave Hansen
Date: Tue Sep 25 2007 - 12:10:53 EST


On Mon, 2007-09-24 at 16:15 -0700, Andrew Morton wrote:
> On Mon, 24 Sep 2007 16:05:37 -0700
> Dave Hansen <haveblue@xxxxxxxxxx> 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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