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    SubjectRe: 2.6.23-rc7-mm1: r/o mounts joke with lockdep
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    On Mon, 2007-09-24 at 09:26 -0700, Andrew Morton wrote:
    > On Mon, 24 Sep 2007 13:51:05 +0400 Alexey Dobriyan <adobriyan@sw.ru> wrote:
    >
    > > static void lock_and_coalesce_cpu_mnt_writer_counts(void)
    > > {
    > > int cpu;
    > > struct mnt_writer *cpu_writer;
    > >
    > > for_each_possible_cpu(cpu) {
    > > cpu_writer = &per_cpu(mnt_writers, cpu);
    > > spin_lock_nested(&cpu_writer->lock, 42);
    > > ^^^^
    > >
    > > What the heck is going on?
    >
    > that was some random 2:00AM hack by me to make the warnings go away.
    >
    > > Given that MAX_LOCKDEP_SUBCLASSES is only 8,
    > > this reliably turns off lockdep at boot.
    >
    > that explains why it worked so well.

    Arjan gave me some ideas on how to fix this more properly. I'm trying
    to reproduce it and working on a patch now.

    -- Dave

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