linux-kernel - [PATCH] PM: s2idle: Introduce syscore callbacks in s2idle flow

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Date:   Tue, 1 Sep 2020 15:04:18 +0800
From:   Claude Yen <claude.yen@...iatek.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>
CC:     <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>
Subject: [PATCH] PM: s2idle: Introduce syscore callbacks in s2idle flow

This series based on 5.9-rc1
This patch makes s2idle call existing syscore callbacks. Currently,
when s2idle is selected as system suspend method, callbacks hooked
by register_syscore_ops() will not be triggered. This may induce
unexpected results. 

For example, sched_clock_suspend() was added to s2idle flow in
commit 3f2552f7e9c5 ("timers/sched_clock: Prevent generic sched_clock
wrap caused by tick_freeze()") to fix clock wrap problem. However,
sched_clock_suspend() is originally registered in syscore callback.
With this patch, if another syscore callback is needed in s2idle,
additional migration effort could be saved.

*** BLURB HERE ***

claude.yen (1):
  PM: s2idle: Introduce syscore callbacks in s2idle flow

 drivers/cpuidle/cpuidle.c |   36 ++++++++++++++++++++++++++++++++----
 kernel/cpu_pm.c           |   17 +++++++++++++++++
 kernel/time/tick-common.c |   17 ++---------------
 3 files changed, 51 insertions(+), 19 deletions(-)

--
1.7.9.5