linux-kernel - Re: [PATCH v9 11/17] arm: tegra20/30: cpuidle: Remove unnecessary memory barrier

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Message-ID: <20200221152554.GN10516@linaro.org>
Date:   Fri, 21 Feb 2020 16:25:54 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Jasper Korten <jja2000@...il.com>,
        David Heidelberg <david@...t.cz>,
        Peter Geis <pgwipeout@...il.com>, linux-pm@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 11/17] arm: tegra20/30: cpuidle: Remove unnecessary
 memory barrier

On Thu, Feb 13, 2020 at 02:51:28AM +0300, Dmitry Osipenko wrote:
> There is no good justification for smp_rmb() after returning from LP2
> because there are no memory operations that require SMP synchronization.
> Thus remove the confusing barrier.
> 
> Acked-by: Peter De Schrijver <pdeschrijver@...dia.com>
> Tested-by: Peter Geis <pgwipeout@...il.com>
> Tested-by: Jasper Korten <jja2000@...il.com>
> Tested-by: David Heidelberg <david@...t.cz>
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>