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path: root/drivers/cpuidle/governors
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Diffstat (limited to 'drivers/cpuidle/governors')
-rw-r--r--drivers/cpuidle/governors/menu.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index ee88838d7f0..a56081ce170 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -200,18 +200,19 @@ static u64 div_round64(u64 dividend, u32 divisor)
static void get_typical_interval(struct menu_device *data)
{
int i, divisor;
- uint64_t max, avg, stddev;
- int64_t thresh = LLONG_MAX; /* Discard outliers above this value. */
+ unsigned int max, thresh;
+ uint64_t avg, stddev;
+
+ thresh = UINT_MAX; /* Discard outliers above this value */
again:
- /* first calculate average and standard deviation of the past */
+ /* First calculate the average of past intervals */
max = 0;
avg = 0;
divisor = 0;
- stddev = 0;
for (i = 0; i < INTERVALS; i++) {
- int64_t value = data->intervals[i];
+ unsigned int value = data->intervals[i];
if (value <= thresh) {
avg += value;
divisor++;
@@ -221,8 +222,10 @@ again:
}
do_div(avg, divisor);
+ /* Then try to determine standard deviation */
+ stddev = 0;
for (i = 0; i < INTERVALS; i++) {
- int64_t value = data->intervals[i];
+ unsigned int value = data->intervals[i];
if (value <= thresh) {
int64_t diff = value - avg;
stddev += diff * diff;