[PATCH v5 01/45] percpu_rwlock: Introduce the global reader-writer lock backend

[Steven Rostedt]

On Wed, 2013-01-23 at 01:28 +0530, Srivatsa S. Bhat wrote:

> > I thought global locks are now fair. That is, a reader will block if a
> > writer is waiting. Hence, the above should deadlock on the current
> > rwlock_t types.
> > 
> 
> Oh is it? Last I checked, lockdep didn't complain about this ABBA scenario!

It doesn't and Peter Zijlstra said we need to fix that ;-)  It only
recently became an issue with the new "fair" locking of rwlocks.

-- Steve