Re: [PATCH 1/4] lockdep: lock_set_subclass() fix

[Peter Zijlstra]

On Tue, 2011-11-08 at 17:07 +0800, Yong Zhang wrote:
> So something like below?

that fails to clear/init the class_cache, leading to all sorts of
problems.

Wiping the class_cache just reduces performance somewhat, not wiping
them is disastrous since it can results in wild pointer derefs.

Now we could fix up register_lock_class() to reset the class_cache,
although that's a little tricky and I'm not sure its worth it.

Anyway, I see you just realized the same.. ;-)
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