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Subject[PATCH 70/70] cpufreq: interactive: Round up timer_rate to match jiffy
Date
From: Junjie Wu <junjiew@codeaurora.org>

Timers are scheduled in unit of jiffies. Round up timer_rate so that
it matches the actual sampling period.

Change-Id: I88386a5a448e40333f9a9b9f0cf72af58cb54656
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>
Signed-off-by: Bálint Czobor <czoborbalint@gmail.com>
---
drivers/cpufreq/cpufreq_interactive.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/cpufreq/cpufreq_interactive.c b/drivers/cpufreq/cpufreq_interactive.c
index 95525b3..a2fc98a 100644
--- a/drivers/cpufreq/cpufreq_interactive.c
+++ b/drivers/cpufreq/cpufreq_interactive.c
@@ -852,12 +852,18 @@ static ssize_t store_timer_rate(struct cpufreq_interactive_tunables *tunables,
const char *buf, size_t count)
{
int ret;
- unsigned long val;
+ unsigned long val, val_round;

ret = kstrtoul(buf, 0, &val);
if (ret < 0)
return ret;
- tunables->timer_rate = val;
+
+ val_round = jiffies_to_usecs(usecs_to_jiffies(val));
+ if (val != val_round)
+ pr_warn("timer_rate not aligned to jiffy. Rounded up to %lu\n",
+ val_round);
+
+ tunables->timer_rate = val_round;
return count;
}

--
1.7.9.5


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