On Mon, 24 Sep 2007 12:03:58 -0400 Mathieu Desnoyers
<[EMAIL PROTECTED]> wrote:
> Hi Ingo,
>
> I got the following printk when booting 2.6.23-rc7-mm1 :
>
> BUG: MAX_LOCKDEP_SUBCLASSES too low!
> turning off the locking correctness validator.
>
> Is it known/correct situation ?
Known, bug in r/o mounts code:
> 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? Given that MAX_LOCKDEP_SUBCLASSES is only 8,
> this reliably turns off lockdep at boot.
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