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From: Peter Zijlstra <peterz@infradead.org>
Subject: Re: What protects rcu_dereference() in __in6_dev_get()?
Date: Fri, 15 Jan 2010 16:31:36 +0100
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On Fri, 2010-01-15 at 16:29 +0100, Eric Dumazet wrote:

> I guess so, but is lockdep_is_held(&mutex) actually cheking this mutex is owned by us ?

Yep, assuming lockdep is still functional, otherwise its return value
will be undefined.