Re: [patch] lockdep: annotate mm/slab.c

[Pekka Enberg]

On 7/13/06, Ingo Molnar <mingo@xxxxxxx> wrote:
> mm/slab.c uses nested locking when dealing with 'off-slab'
> caches, in that case it allocates the slab header from the
> (on-slab) kmalloc caches. Teach the lock validator about
> this by putting all on-slab caches into a separate class.

What's "nested lock" btw? If I understood from the other patch, you're
talking about ac->lock. Surely you can't take the same lock twice but
it's perfectly legal to take lock as long as the ac instance is
different...
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