[PATCH v3 4/5] arch_topology, cpufreq: constify arch_* cpumasks

[Ionela Voinescu]

From: Valentin Schneider <valentin.schnei...@arm.com>

The passed cpumask arguments to arch_set_freq_scale() 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.schnei...@arm.com>
Signed-off-by: Ionela Voinescu <ionela.voine...@arm.com>
Acked-by: Catalin Marinas <catalin.mari...@arm.com>
Cc: Catalin Marinas <catalin.mari...@arm.com>
Cc: Will Deacon <w...@kernel.org>
Cc: Sudeep Holla <sudeep.ho...@arm.com>
Cc: Rafael J. Wysocki <r...@rjwysocki.net>
Cc: Viresh Kumar <viresh.ku...@linaro.org>
---
 arch/arm64/kernel/topology.c  | 2 +-
 drivers/base/arch_topology.c  | 4 ++--
 drivers/cpufreq/cpufreq.c     | 5 +++--
 include/linux/arch_topology.h | 2 +-
 include/linux/cpufreq.h       | 3 ++-
 5 files changed, 9 insertions(+), 7 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 1aca82fcceb8..43d40822b956 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 b3a7d1cc5e92..ae41eb011557 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -171,8 +171,9 @@ 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 69b1dabe39dc..810c83336257 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);
 
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 091df9968945..8f22072c8d90 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -1011,7 +1011,8 @@ 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 */
-- 
2.17.1