Re: [PATCH RFC tip/core/rcu 7/7] rcu: Quiet RCU-lockdep warningsinvolving interrupt disabling

[Paul E. McKenney]

On Tue, Dec 06, 2011 at 10:52:32AM +0100, Peter Zijlstra wrote:
> On Tue, 2011-12-06 at 09:26 +0800, Yong Zhang wrote:
> 
> > Yeah, because we call might_sleep() in rt_mutex_lock() unconditionally.
> > But in this case the 'BUG: sleeping function called from invalid context
> > at *' is obviously false positive.
> 
> Why can't this mutex acquisition not block?

Because its purpose in life is to pass its priority on to the lock
holder.

							Thanx, Paul

> > Maybe we could teach might_sleep() about this special case?
> 
> Sounds horrid.
> 

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