linux-kernel - [PATCH v2 1/2] cpufreq: Move the IS_ENABLED(CPU

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Date:   Mon, 24 Jun 2019 15:17:14 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     viresh.kumar@...aro.org
Cc:     rjw@...ysocki.net, edubezval@...il.com,
        linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org (open list:CPU FREQUENCY SCALING FRAMEWORK)
Subject: [PATCH v2 1/2] cpufreq: Move the IS_ENABLED(CPU_THERMAL) macro in a stub

The cpufreq_online and the cpufreq_offline [un]register the driver as
a cooling device. This is done if the driver is flagged as a cooling
device in addition with a IS_ENABLED macro to compile out the branching
code.

Group this test in a stub function added in the cpufreq header instead
of having the IS_ENABLED in the code path.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/cpufreq/cpufreq.c | 6 ++----
 include/linux/cpufreq.h   | 5 +++++
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 85ff958e01f1..aee024e42618 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1378,8 +1378,7 @@ static int cpufreq_online(unsigned int cpu)
 	if (cpufreq_driver->ready)
 		cpufreq_driver->ready(policy);
 
-	if (IS_ENABLED(CONFIG_CPU_THERMAL) &&
-	    cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV)
+	if (cpufreq_thermal_control_enabled(cpufreq_driver))
 		policy->cdev = of_cpufreq_cooling_register(policy);
 
 	pr_debug("initialization complete\n");
@@ -1469,8 +1468,7 @@ static int cpufreq_offline(unsigned int cpu)
 		goto unlock;
 	}
 
-	if (IS_ENABLED(CONFIG_CPU_THERMAL) &&
-	    cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV) {
+	if (cpufreq_thermal_control_enabled(cpufreq_driver)) {
 		cpufreq_cooling_unregister(policy->cdev);
 		policy->cdev = NULL;
 	}
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index d01a74fbc4db..53ec82d75565 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -409,6 +409,11 @@ int cpufreq_unregister_driver(struct cpufreq_driver *driver_data);
 const char *cpufreq_get_current_driver(void);
 void *cpufreq_get_driver_data(void);
 
+static inline int cpufreq_thermal_control_enabled(struct cpufreq_driver *drv)
+{
+	return IS_ENABLED(CPU_THERMAL) && (drv->flags & CPUFREQ_IS_COOLING_DEV);
+}
+
 static inline void cpufreq_verify_within_limits(struct cpufreq_policy *policy,
 		unsigned int min, unsigned int max)
 {
-- 
2.17.1