Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[linux.git] / drivers / cpufreq / cpufreq_stats.c

diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 06d3abdffd3a39e391f27d644ec8b2d19a7e0fb5..ac284e66839c6f19c9156432c6f5c4995e6525fb 100644 (file)
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -41,6 +41,18 @@ static int cpufreq_stats_update(struct cpufreq_stats *stats)
        return 0;
 }
 
+static void cpufreq_stats_clear_table(struct cpufreq_stats *stats)
+{
+       unsigned int count = stats->max_state;
+
+       memset(stats->time_in_state, 0, count * sizeof(u64));
+#ifdef CONFIG_CPU_FREQ_STAT_DETAILS
+       memset(stats->trans_table, 0, count * count * sizeof(int));
+#endif
+       stats->last_time = get_jiffies_64();
+       stats->total_trans = 0;
+}
+
 static ssize_t show_total_trans(struct cpufreq_policy *policy, char *buf)
 {
        return sprintf(buf, "%d\n", policy->stats->total_trans);
@@ -64,6 +76,14 @@ static ssize_t show_time_in_state(struct cpufreq_policy *policy, char *buf)
        return len;
 }
 
+static ssize_t store_reset(struct cpufreq_policy *policy, const char *buf,
+                          size_t count)
+{
+       /* We don't care what is written to the attribute. */
+       cpufreq_stats_clear_table(policy->stats);
+       return count;
+}
+
 #ifdef CONFIG_CPU_FREQ_STAT_DETAILS
 static ssize_t show_trans_table(struct cpufreq_policy *policy, char *buf)
 {
@@ -113,10 +133,12 @@ cpufreq_freq_attr_ro(trans_table);
 
 cpufreq_freq_attr_ro(total_trans);
 cpufreq_freq_attr_ro(time_in_state);
+cpufreq_freq_attr_wo(reset);
 
 static struct attribute *default_attrs[] = {
        &total_trans.attr,
        &time_in_state.attr,
+       &reset.attr,
 #ifdef CONFIG_CPU_FREQ_STAT_DETAILS
        &trans_table.attr,
 #endif