From: Peter Zijlstra
Date: Mon Oct 03 2016 - 05:25:19 EST


During my last PI failing patch set it became obvious there's a number of
related fail in FUTEX_UNLOCK_PI that needed sorting before we can move on
with that stuff.

These here patches are the result of staring at that code for a wee bit.

Please have a very _very_ careful look at the last patch, it appears to not
explode when running:

- perf bench futex lock-pi
- selftests/futex

but given the immense amount of tricky involved with both PI and futex there is
bound to be something I've overlooked.

Do people have more/better futex-pi test cases?