linux-kernel - [RFC][PATCH 0/4] FUTEX_UNLOCK

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Message-Id: <20161003091234.879763059@infradead.org>
Date:   Mon, 03 Oct 2016 11:12:34 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org, tglx@...utronix.de, juri.lelli@....com,
        rostedt@...dmis.org, xlpang@...hat.com, bigeasy@...utronix.de
Cc:     linux-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com,
        jdesfossez@...icios.com, bristot@...hat.com, peterz@...radead.org
Subject: [RFC][PATCH 0/4] FUTEX_UNLOCK_PI wobbles

Hi,

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?