linux-kernel - [PATCH 0/2] Modularize RPMH driver

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Message-Id: <1597831670-17401-1-git-send-email-mkshah@codeaurora.org>
Date:   Wed, 19 Aug 2020 15:37:48 +0530
From:   Maulik Shah <mkshah@...eaurora.org>
To:     bjorn.andersson@...aro.org, agross@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        ulf.hansson@...aro.org, swboyd@...omium.org, dianders@...omium.org,
        rnayak@...eaurora.org, ilina@...eaurora.org, lsrao@...eaurora.org,
        Maulik Shah <mkshah@...eaurora.org>
Subject: [PATCH 0/2] Modularize RPMH driver

This series is to modularize RPMH driver

The tracepoint in RPMH driver was changed to _rcuidle variant based on the
test results of unmerged series [1] where .power_off callback from genpd
reported RCU warnings. 

The series which finally got merged [2] uses CPU PM notifications
and genpd .power_off callback is not implemented in RPMH driver to invoke
rpmh_flush(). The CPU PM notifications are done with RCU non idle in kernel
(see cpu_pm_notify() uses rcu_irq_enter_irqson() before notifications)

However using _rcuidle variant prevented RPMH driver to compile as module
since these _rcuidle are not exported symbols for tracepoints.

This seris reverts the change [3] to remove _rcuidle variant for tracepoint
as its no more valid test case (genpd .power_off is not implemented)
and bring backs the change [4] that was reverted due to _rcuidle preventing
to become modular.

[1] https://patchwork.kernel.org/project/linux-arm-msm/list/?series=243931
[2] https://patchwork.kernel.org/project/linux-arm-msm/list/?series=269733
[3] https://lore.kernel.org/r/20200115013751.249588-1-swboyd@chromium.org 
[4] https://lore.kernel.org/r/20200326224459.105170-3-john.stultz@linaro.org 

Maulik Shah (2):
  Revert "drivers: qcom: rpmh-rsc: Use rcuidle tracepoints for rpmh"
  Revert "Revert "soc: qcom: rpmh: Allow RPMH driver to be loaded as a
    module""

 drivers/soc/qcom/Kconfig    | 2 +-
 drivers/soc/qcom/rpmh-rsc.c | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

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