Messages in this thread | | | Subject | Re: 2.6.23-rc7-mm1: r/o mounts joke with lockdep | From | Dave Hansen <> | Date | Mon, 24 Sep 2007 09:33:00 -0700 |
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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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