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From: Peter Zijlstra on 14 Jan 2010 04:20
On Wed, 2010-01-13 at 19:09 -0800, Eric W. Biederman wrote:
>
> I agree weird. Either you don't have my patch working correctly or I
> talk a good good game but I don't have a clue about lockdep
> subclasses.

Subclasses and classes are basically the same thing, except that
subclasses are an 'easy' way to modify the regular class of an object.

Subclasses are limited to 7, 0 (the regular class), 1-7 subclasses.

Subclasses (just like regular classes) have no intrinsic ordering, their
order is given by the lock hierarchy.

Anything else you want to know?

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