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

    On Thu, 13 Jul 2006, Pekka Enberg wrote:
    > 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...

    Normally, no. You can't take another lock just because the instance is
    different. That causes ABBA deadlocks unless you have some underlying
    _ordering_ of the different lock instances.

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