linux-kernel - Re: [PATCH v2 4/4] locking/qspinlock, x86: Provide liveness guarantee

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Message-ID: <20181012092209.GE12289@arm.com>
Date:   Fri, 12 Oct 2018 10:22:09 +0100
From:   Will Deacon <will.deacon@....com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org, longman@...hat.com,
        andrea.parri@...rulasolutions.com, tglx@...utronix.de,
        bigeasy@...utronix.de
Subject: Re: [PATCH v2 4/4] locking/qspinlock, x86: Provide liveness guarantee

On Wed, Oct 10, 2018 at 05:12:57PM +0100, Will Deacon wrote:
> On Wed, Oct 03, 2018 at 03:03:01PM +0200, Peter Zijlstra wrote:
> >  arch/x86/include/asm/qspinlock.h |   15 +++++++++++++++
> >  kernel/locking/qspinlock.c       |   16 +++++++++++++++-
> >  2 files changed, 30 insertions(+), 1 deletion(-)
> 
> I've failed to break this by thinking really hard, so I've updated Catalin's
> TLA model to see if the tools are still happy. I'll get back to you once
> they've finished chewing on it.

The model is happy, so this doesn't introduce any "bad" SC behaviours.

Reviewed-by: Will Deacon <will.deacon@....com>

Will