| From | Bálint Czobor <> | Subject | [PATCH 70/70] cpufreq: interactive: Round up timer_rate to match jiffy | Date | Tue, 27 Oct 2015 18:30:58 +0100 |
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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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