From a0e5af3cb89b59aa6c62b1f97c8d553ff3fb51c1 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sat, 24 Nov 2012 10:08:47 +0100 Subject: [PATCH] cpufreq: governors: Fix jiffies/cputime mixup (revisited) This change was made by commit 8636fd2 (cpufreq: fix jiffies/cputime mixup in conservative/ondemand governors) before, but then it has been reverted inadvertently by commit 4471a34 (cpufreq: governors: remove redundant code). The changelog of commit 8636fd2's says: The function get_cpu_idle_time_jiffy in both the conservative and ondemand governors use jiffies_to_usecs to convert a cputime value to usecs which gives the wrong value on architectures where cputime and jiffies use different units. Only matters if NO_HZ is disabled, since otherwise get_cpu_idle_time_us should already return a valid value, and get_cpu_idle_time_jiffy isn't actually called. Since now we have only one common get_cpu_idle_time_jiffy() used by both governors in question, modify it along the lines of commit 8636fd2 to restore the correct behavior. Signed-off-by: Rafael J. Wysocki Reviewed-by: Viresh Kumar --- drivers/cpufreq/cpufreq_governor.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c index be9d255e292f..6c5f1d383cdc 100644 --- a/drivers/cpufreq/cpufreq_governor.c +++ b/drivers/cpufreq/cpufreq_governor.c @@ -45,9 +45,9 @@ static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall) idle_time = cur_wall_time - busy_time; if (wall) - *wall = jiffies_to_usecs(cur_wall_time); + *wall = cputime_to_usecs(cur_wall_time); - return jiffies_to_usecs(idle_time); + return cputime_to_usecs(idle_time); } u64 get_cpu_idle_time(unsigned int cpu, u64 *wall)