linux-kernel - Re: [PATCH 1/4] lockdep: lock_set

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Date:	Tue, 08 Nov 2011 10:40:46 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Yong Zhang <yong.zhang0@...il.com>
Cc:	Vegard Nossum <vegard.nossum@...il.com>,
	linux-kernel@...r.kernel.org, sergey.senozhatsky@...il.com,
	bp@...en8.de, Ingo Molnar <mingo@...e.hu>,
	Tejun Heo <tj@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	casteyde.christian@...e.fr
Subject: Re: [PATCH 1/4] lockdep: lock_set_subclass() fix

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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