cpufreq: Move scheduler-related code to the sched directory

Create cpufreq.c under kernel/sched/ and move the cpufreq code
related to the scheduler to that file and to sched.h.

Redefine cpufreq_update_util() as a static inline function to avoid
function calls at its call sites in the scheduler code (as suggested
by Peter Zijlstra).

Also move the definition of struct update_util_data and declaration
of cpufreq_set_update_util_data() from include/linux/cpufreq.h to
include/linux/sched.h.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>

2 files changed, 9 insertions, 34 deletions

diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index a50c5b2e3bf2..a5ea52f793f3 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -146,36 +146,6 @@ static inline bool policy_is_shared(struct cpufreq_policy *policy)
 extern struct kobject *cpufreq_global_kobject;
 
 #ifdef CONFIG_CPU_FREQ
-void cpufreq_update_util(u64 time, unsigned long util, unsigned long max);
-
-/**
- * cpufreq_trigger_update - Trigger CPU performance state evaluation if needed.
- * @time: Current time.
- *
- * The way cpufreq is currently arranged requires it to evaluate the CPU
- * performance state (frequency/voltage) on a regular basis to prevent it from
- * being stuck in a completely inadequate performance level for too long.
- * That is not guaranteed to happen if the updates are only triggered from CFS,
- * though, because they may not be coming in if RT or deadline tasks are active
- * all the time (or there are RT and DL tasks only).
- *
- * As a workaround for that issue, this function is called by the RT and DL
- * sched classes to trigger extra cpufreq updates to prevent it from stalling,
- * but that really is a band-aid.  Going forward it should be replaced with
- * solutions targeted more specifically at RT and DL tasks.
- */
-static inline void cpufreq_trigger_update(u64 time)
-{
-	cpufreq_update_util(time, ULONG_MAX, 0);
-}
-
-struct update_util_data {
-	void (*func)(struct update_util_data *data,
-		     u64 time, unsigned long util, unsigned long max);
-};
-
-void cpufreq_set_update_util_data(int cpu, struct update_util_data *data);
-
 unsigned int cpufreq_get(unsigned int cpu);
 unsigned int cpufreq_quick_get(unsigned int cpu);
 unsigned int cpufreq_quick_get_max(unsigned int cpu);
@@ -187,10 +157,6 @@ int cpufreq_update_policy(unsigned int cpu);
 bool have_governor_per_policy(void);
 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy);
 #else
-static inline void cpufreq_update_util(u64 time, unsigned long util,
-				       unsigned long max) {}
-static inline void cpufreq_trigger_update(u64 time) {}
-
 static inline unsigned int cpufreq_get(unsigned int cpu)
 {
 	return 0;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index a10494a94cc3..913e755ef7b8 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -3207,4 +3207,13 @@ static inline unsigned long rlimit_max(unsigned int limit)
 	return task_rlimit_max(current, limit);
 }
 
+#ifdef CONFIG_CPU_FREQ
+struct update_util_data {
+	void (*func)(struct update_util_data *data,
+		     u64 time, unsigned long util, unsigned long max);
+};
+
+void cpufreq_set_update_util_data(int cpu, struct update_util_data *data);
+#endif /* CONFIG_CPU_FREQ */
+
 #endif