cpufreq: governors: Remove code redundancy between governors

With the inclusion of following patches:

9f4eb10 cpufreq: conservative: call dbs_check_cpu only when necessary
772b4b1 cpufreq: ondemand: call dbs_check_cpu only when necessary

code redundancy between the conservative and ondemand governors is
introduced again, so get rid of it.

[rjw: Changelog]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Fabio Baltieri <fabio.baltieri@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index 29d6a59b1a15..7aaa9b151940 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -177,6 +177,25 @@ static inline void dbs_timer_exit(struct dbs_data *dbs_data, int cpu)
         cancel_delayed_work_sync(&cdbs->work);
 }
 
+/* Will return if we need to evaluate cpu load again or not */
+bool need_load_eval(struct cpu_dbs_common_info *cdbs,
+                unsigned int sampling_rate)
+{
+        if (policy_is_shared(cdbs->cur_policy)) {
+                ktime_t time_now = ktime_get();
+                s64 delta_us = ktime_us_delta(time_now, cdbs->time_stamp);
+
+                /* Do nothing if we recently have sampled */
+                if (delta_us < (s64)(sampling_rate / 2))
+                        return false;
+                else
+                        cdbs->time_stamp = time_now;
+        }
+
+        return true;
+}
+EXPORT_SYMBOL_GPL(need_load_eval);
+
 int cpufreq_governor_dbs(struct dbs_data *dbs_data,
                 struct cpufreq_policy *policy, unsigned int event)
 {