Re: [PATCH RFC tip/core/rcu 14/18] rcu: lockdep check for exitingto user space as RCU reader

[Peter Zijlstra]

On Tue, 2009-12-15 at 15:02 -0800, Paul E. McKenney wrote:
> From: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
> 
> Proposed for 2.6.34, not for inclusion.
> 
> It is illegal to return to user-space execution while running within an
> RCU read-side critical section.  It turns out that CONFIG_TREE_PREEMPT_RCU
> has enough information lying around to detect this, so add the checks
> to lockdep (CONFIG_PROVE_LOCKING).

But uhm, we already track the rcu read lock as a regular lockdep lock,
so it should already check this, no?


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