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

[Linus Torvalds]

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.

		Linus
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/