linux-kernel - [PATCH v3 0/5] PM / devfreq: Various Fixes to cpufreq based passive governor

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Date:   Tue, 14 Jun 2022 13:06:56 +0200
From:   Christian 'Ansuel' Marangi <ansuelsmth@...il.com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Sibi Sankar <sibis@...eaurora.org>,
        Saravana Kannan <skannan@...eaurora.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Christian 'Ansuel' Marangi <ansuelsmth@...il.com>
Subject: [PATCH v3 0/5] PM / devfreq: Various Fixes to cpufreq based passive governor

While developing a krait cache scaling devfreq driver I encounter tons
of panics and errors with using the new cpufreq passive governor
functions. While the krait cache scaling is still WIP and required some
testing I would like to push all the fixes to make the new
implementation wroking since currently with a the governor
PROBE_DEFERRing all sort of things happen from kernel panic from invalid
address access to freq_table getting corrupted.

With the following fixes my WIP driver works correctly without any
warning/problems. 

v3:
- Fix compilation error for list_for_each_entry_safe (i'm stupid -.-''')
v2:
- Fix wrong list_for_each_entry reported by Dan Carpenter

Christian 'Ansuel' Marangi (5):
  PM / devfreq: Fix cpufreq passive unregister erroring on PROBE_DEFER
  PM / devfreq: Fix kernel warning with cpufreq passive register fail
  PM / devfreq: Fix kernel panic with cpu based scaling to passive gov
  PM / devfreq: Rework freq_table to be local to devfreq struct
  PM / devfreq: Mute warning on governor PROBE_DEFER

 drivers/devfreq/devfreq.c          | 75 ++++++++++++++----------------
 drivers/devfreq/governor_passive.c | 41 ++++++----------
 include/linux/devfreq.h            |  4 ++
 3 files changed, 54 insertions(+), 66 deletions(-)

-- 
2.36.1