Re: [PATCH RFC tip/core/rcu 24/28] rcu: Introduce bulk referencecount

[Peter Zijlstra]

On Mon, 2011-11-28 at 10:31 -0800, Paul E. McKenney wrote:
> >   local_irq_save(flags);
> >   srcu_read_lock(&my_srcu_domain);
> >   local_irq_restore(flags);
> > 
> > and
> > 
> >   local_irq_save(flags);
> >   srcu_read_unlock(&my_srcu_domain);
> >   local_irq_restore(flags)
> > 
> > Doesn't look to be too hard, or confusing.
> 
> Ah, OK, I was under the mistaken impression that lockdep would splat
> if you did (for example) srcu_read_lock() in an exception handler and
> srcu_read_unlock() in the context of the task that took the exception. 

I don't think it will, lockdep does very little actual validation on the
RCU locks other than recording they're held. But if they do, the planned
TODO item will get inversed.

Should be easy enough to test I guess.
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