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Subject[PATCH 1/3] thermal/cpu-cooling, sched/core: Cleanup thermal pressure definition
Date
The following commit:

14533a16c46d ("thermal/cpu-cooling, sched/core: Move the arch_set_thermal_pressure() API to generic scheduler code")

moved the definition of arch_set_thermal_pressure() to sched/core.c, but
kept its declaration in linux/arch_topology.h. When building e.g. an x86
kernel with CONFIG_SCHED_THERMAL_PRESSURE=y, cpufreq_cooling.c ends up
getting the declaration of arch_set_thermal_pressure() from
include/linux/arch_topology.h, which is somewhat awkward.

On top of this, the public setter, arch_set_thermal_pressure(), is defined
unconditionally in sched/core.c while the public getter,
arch_scale_thermal_pressure(), is hardcoded to return 0 unless it has been
redefined by the architecture. arch_*() functions are meant to be defined
by architectures, so revert the aforementioned commit and re-implement it
in a way that keeps arch_set_thermal_pressure() architecture-definable.

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
---
drivers/base/arch_topology.c | 11 +++++++++++
drivers/thermal/cpufreq_cooling.c | 5 +++++
include/linux/arch_topology.h | 3 ---
kernel/sched/core.c | 11 -----------
4 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 4d0a0038b476..d14cab7dfa3c 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -54,6 +54,17 @@ void topology_set_cpu_scale(unsigned int cpu, unsigned long capacity)
per_cpu(cpu_scale, cpu) = capacity;
}

+DEFINE_PER_CPU(unsigned long, thermal_pressure);
+
+void arch_set_thermal_pressure(const struct cpumask *cpus,
+ unsigned long th_pressure)
+{
+ int cpu;
+
+ for_each_cpu(cpu, cpus)
+ WRITE_ONCE(per_cpu(thermal_pressure, cpu), th_pressure);
+}
+
static ssize_t cpu_capacity_show(struct device *dev,
struct device_attribute *attr,
char *buf)
diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c
index e297e135c031..a1efd379b683 100644
--- a/drivers/thermal/cpufreq_cooling.c
+++ b/drivers/thermal/cpufreq_cooling.c
@@ -417,6 +417,11 @@ static int cpufreq_get_cur_state(struct thermal_cooling_device *cdev,
return 0;
}

+__weak void
+arch_set_thermal_pressure(const struct cpumask *cpus, unsigned long th_pressure)
+{
+}
+
/**
* cpufreq_set_cur_state - callback function to set the current cooling state.
* @cdev: thermal cooling device pointer.
diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h
index 0566cb3314ef..81bd1c627195 100644
--- a/include/linux/arch_topology.h
+++ b/include/linux/arch_topology.h
@@ -39,9 +39,6 @@ static inline unsigned long topology_get_thermal_pressure(int cpu)
return per_cpu(thermal_pressure, cpu);
}

-void arch_set_thermal_pressure(struct cpumask *cpus,
- unsigned long th_pressure);
-
struct cpu_topology {
int thread_id;
int core_id;
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 43ba2d4a8eca..7861d21f3c2b 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3628,17 +3628,6 @@ unsigned long long task_sched_runtime(struct task_struct *p)
return ns;
}

-DEFINE_PER_CPU(unsigned long, thermal_pressure);
-
-void arch_set_thermal_pressure(struct cpumask *cpus,
- unsigned long th_pressure)
-{
- int cpu;
-
- for_each_cpu(cpu, cpus)
- WRITE_ONCE(per_cpu(thermal_pressure, cpu), th_pressure);
-}
-
/*
* This function gets called by the timer code, with HZ frequency.
* We call it with interrupts disabled.
--
2.27.0
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