From 4db1f0ac8761fc30d4e1230939d623a52517bdcc Mon Sep 17 00:00:00 2001 From: Junjie Wu Date: Fri, 15 Aug 2014 16:34:37 -0700 Subject: [PATCH] cpufreq: interactive: Round up timer_rate to match jiffy 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 --- 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 49f206e48aa3..6bbcc905bb3e 100644 --- a/drivers/cpufreq/cpufreq_interactive.c +++ b/drivers/cpufreq/cpufreq_interactive.c @@ -855,12 +855,18 @@ 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 = strict_strtoul(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; } -- 2.34.1