linux-kernel - [PATCH v2 0/4] locking/qspinlock, x86: Improve determinism for x86

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Date:   Wed, 03 Oct 2018 15:02:57 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     will.deacon@....com, mingo@...nel.org
Cc:     linux-kernel@...r.kernel.org, longman@...hat.com,
        andrea.parri@...rulasolutions.com, tglx@...utronix.de,
        bigeasy@...utronix.de, Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v2 0/4] locking/qspinlock, x86: Improve determinism for x86

Back when Will did his qspinlock determinism patches, we were left with one
cmpxchg loop on x86 due to the use of atomic_fetch_or(). Will proposed a nifty
trick:

  http://lkml.kernel.org/r/20180409145409.GA9661@arm.com

While that didn't quite work, this series implements that basic idea.

Changes since v1:

 - Adjusted comments in #2, wildea01
 - 'Simplified' GEN_*_RMWcc, peterz
 - Rewrote _the_ patch to use BTS, wildea01