linux-kernel - [PATCH 6/8] arch_topology,cpufreq,sched/core: constify arch

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Date:   Wed,  1 Jul 2020 10:07:49 +0100
From:   Ionela Voinescu <ionela.voinescu@....com>
To:     rjw@...ysocki.net, viresh.kumar@...aro.org,
        catalin.marinas@....com, sudeep.holla@....com, will@...nel.org,
        linux@...linux.org.uk, valentin.schneider@....com
Cc:     mingo@...hat.com, peterz@...radead.org, dietmar.eggemann@....com,
        ionela.voinescu@....com, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 6/8] arch_topology,cpufreq,sched/core: constify arch_* cpumasks

From: Valentin Schneider <valentin.schneider@....com>

The passed cpumask arguments to:
 - arch_set_freq_scale(),
 - arch_set_thermal_pressure(), and
 - arch_freq_counters_available()

are only iterated over, so reflect this in the prototype. This also
allows to pass system cpumasks like cpu_online_mask without getting
a warning.

Signed-off-by: Valentin Schneider <valentin.schneider@....com>
Signed-off-by: Ionela Voinescu <ionela.voinescu@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Sudeep Holla <sudeep.holla@....com>
Cc: Rafael J. Wysocki <rjw@...ysocki.net>
Cc: Viresh Kumar <viresh.kumar@...aro.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
---
 arch/arm64/kernel/topology.c  | 2 +-
 drivers/base/arch_topology.c  | 4 ++--
 drivers/cpufreq/cpufreq.c     | 5 +++--
 include/linux/arch_topology.h | 4 ++--
 include/linux/cpufreq.h       | 3 ++-
 kernel/sched/core.c           | 2 +-
 6 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index 0801a0f3c156..9a9f2b8dedf5 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -253,7 +253,7 @@ static int __init init_amu_fie(void)
 }
 late_initcall_sync(init_amu_fie);
 
-bool arch_freq_counters_available(struct cpumask *cpus)
+bool arch_freq_counters_available(const struct cpumask *cpus)
 {
 	return amu_freq_invariant() &&
 	       cpumask_subset(cpus, amu_fie_cpus);
diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 4d0a0038b476..8447e1f30340 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -21,13 +21,13 @@
 #include <linux/sched.h>
 #include <linux/smp.h>
 
-__weak bool arch_freq_counters_available(struct cpumask *cpus)
+__weak bool arch_freq_counters_available(const struct cpumask *cpus)
 {
 	return false;
 }
 DEFINE_PER_CPU(unsigned long, freq_scale) = SCHED_CAPACITY_SCALE;
 
-void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
+void arch_set_freq_scale(const struct cpumask *cpus, unsigned long cur_freq,
 			 unsigned long max_freq)
 {
 	unsigned long scale;
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 60b5272c5d80..161b8089b0f6 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -177,8 +177,9 @@ u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy)
 }
 EXPORT_SYMBOL_GPL(get_cpu_idle_time);
 
-__weak void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
-		unsigned long max_freq)
+__weak void arch_set_freq_scale(const struct cpumask *cpus,
+				unsigned long cur_freq,
+				unsigned long max_freq)
 {
 }
 EXPORT_SYMBOL_GPL(arch_set_freq_scale);
diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h
index 0566cb3314ef..4be0315700cb 100644
--- a/include/linux/arch_topology.h
+++ b/include/linux/arch_topology.h
@@ -30,7 +30,7 @@ static inline unsigned long topology_get_freq_scale(int cpu)
 	return per_cpu(freq_scale, cpu);
 }
 
-bool arch_freq_counters_available(struct cpumask *cpus);
+bool arch_freq_counters_available(const struct cpumask *cpus);
 
 DECLARE_PER_CPU(unsigned long, thermal_pressure);
 
@@ -39,7 +39,7 @@ static inline unsigned long topology_get_thermal_pressure(int cpu)
 	return per_cpu(thermal_pressure, cpu);
 }
 
-void arch_set_thermal_pressure(struct cpumask *cpus,
+void arch_set_thermal_pressure(const struct cpumask *cpus,
 			       unsigned long th_pressure);
 
 struct cpu_topology {
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 8b6369d657bd..23398133c24b 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -1003,7 +1003,8 @@ static inline void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
 extern void arch_freq_prepare_all(void);
 extern unsigned int arch_freq_get_on_cpu(int cpu);
 
-extern void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
+extern void arch_set_freq_scale(const struct cpumask *cpus,
+				unsigned long cur_freq,
 				unsigned long max_freq);
 
 /* the following are really really optional */
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f518af52d0fb..b44a42b1236c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3645,7 +3645,7 @@ unsigned long long task_sched_runtime(struct task_struct *p)
 
 DEFINE_PER_CPU(unsigned long, thermal_pressure);
 
-void arch_set_thermal_pressure(struct cpumask *cpus,
+void arch_set_thermal_pressure(const struct cpumask *cpus,
 			       unsigned long th_pressure)
 {
 	int cpu;
-- 
2.17.1