linux-kernel - Re: [PATCH 2/4] base/drivers/arch_topology: Replace mutex with READ_ONCE / WRITE

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Message-ID: <20181126113330.GB4871@sirena.org.uk>
Date:   Mon, 26 Nov 2018 11:33:30 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>, rjw@...ysocki.net,
        vincent.guittot@...aro.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: Re: [PATCH 2/4] base/drivers/arch_topology: Replace mutex with
 READ_ONCE / WRITE_ONCE

On Mon, Nov 26, 2018 at 09:27:02AM +0100, Juri Lelli wrote:

> is highly debatable). I also seem to remember that there might also be
> cases where DT values cannot be changed at all for a (new?) platform
> that happens to be using DTs shipped with an old revision; something
> along these lines was mentioned (by Mark?) during the review process,
> but exact details escape my mind ATM, apologies.

Yeah, DTs might be in firmware which is either non-updatable or which
people are reluctant to update due to it not being recoverable if the
update goes wrong.

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