[PATCH v3 10/12] locking/ww_mutex: Yield to other waiters from optimistic spin

[Peter Zijlstra]

OK, so I got this far, although I stuffed two patches in the middle
(which I should probably pull to the beginning and did this one patch
differently.

I've not really tested the result yet, will attempt to do so tomorrow.

Please have a look at the current state of things here:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/core