linux-kernel - [PATCH v5 0/6] cpufreq: use __free() for all cpufreq_cpu

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Message-Id: <20250905132413.1376220-1-zhangzihuan@kylinos.cn>
Date: Fri,  5 Sep 2025 21:24:07 +0800
From: Zihuan Zhang <zhangzihuan@...inos.cn>
To: "Rafael J . wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Jonathan Cameron <jonathan.cameron@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Thierry Reding <thierry.reding@...il.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Daniel Lezcano <daniel.lezcano@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	Eduardo Valentin <edubezval@...il.com>,
	Keerthy <j-keerthy@...com>
Cc: Ben Horgan <ben.horgan@....com>,
	zhenglifeng <zhenglifeng1@...wei.com>,
	Zhang Rui <rui.zhang@...el.com>,
	Len Brown <lenb@...nel.org>,
	Lukasz Luba <lukasz.luba@....com>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Beata Michalska <beata.michalska@....com>,
	Fabio Estevam <festevam@...il.com>,
	Pavel Machek <pavel@...nel.org>,
	Sumit Gupta <sumitg@...dia.com>,
	Prasanna Kumar T S M <ptsm@...ux.microsoft.com>,
	Sudeep Holla <sudeep.holla@....com>,
	Yicong Yang <yangyicong@...ilicon.com>,
	linux-pm@...r.kernel.org,
	linux-acpi@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org,
	intel-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	imx@...ts.linux.dev,
	linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Zihuan Zhang <zhangzihuan@...inos.cn>
Subject: [PATCH v5 0/6] cpufreq: use __free() for all cpufreq_cpu_get() references

This patchset converts all remaining cpufreq users to rely on the
__free(put_cpufreq_policy) annotation for policy references, instead of
calling cpufreq_cpu_put() manually.

Motivation:
- Reduce the chance of reference counting mistakes
- Make the code more consistent with the latest kernel style
- behavior remains the same, but reference counting is now safer 
  and easier to maintain.

The changes are split into 6 patches as they touch different subsystems
and are maintained by different people. There is no functional change.

V5:
 - drop 4 patches
 - change return value int topology.c suggested by Jonathan Cameron
 - fix code in processor_thermal.c suggested by Rafael and Jonathan Cameron
 - fix code in intel_pstate.c suggested by Rafael
 - fix code in governor_passive.c suggested Jonathan Cameron
 - fix code in energy_model.c suggested by Rafael and Krzysztof Kozlowski

V4:
 - Fix compile error in topology.c
 - drop 2 patches
 - Move code into a function in processor_thermal.c
 - Move code into a function in intel_pstate.c
 - Move policy declare in dtpm_cpu.c
 - Fix compile error in imx_thermal.c
 - Fix compile error in ti-thermal-common.c
 - Fix compile error in energy_model.c

V3:
 - drop patch 'KVM: x86: Use __free(put_cpufreq_policy) for policy reference'
 - removed 5 patches which has been applied
 - Consolidate CPUFreq policy assignments and allocations into one line,
   suggested by Ben Horgan
 - Change cpu_has_cpufreq() return type to bool, following Rafael's suggestion
 - Change the title to 'Use scope-based cleanup helper'

V2:
 - Fix compile error in powernv-cpufreq.c
 - Split patch to separate logical changes

Zihuan Zhang (6):
  arm64: topology: Use scope-based cleanup helper
  ACPI: processor: thermal: Use scope-based cleanup helper
  cpufreq: intel_pstate: Use scope-based cleanup helper
  PM / devfreq: Use scope-based cleanup helper
  drm/i915: Use scope-based cleanup helper
  PM: EM: Use scope-based cleanup helper

 arch/arm64/kernel/topology.c        | 11 ++----
 drivers/acpi/processor_thermal.c    | 52 +++++++++++++------------
 drivers/cpufreq/intel_pstate.c      | 59 +++++++++++++++-------------
 drivers/devfreq/governor_passive.c  | 60 +++++++++++------------------
 drivers/gpu/drm/i915/gt/intel_llc.c |  4 +-
 kernel/power/energy_model.c         |  9 +----
 6 files changed, 89 insertions(+), 106 deletions(-)

-- 
2.25.1