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| author | Minsung Kim <ms925.kim@samsung.com> | 2013-04-23 22:32:01 +0900 |
|---|---|---|
| committer | Ziyann <jaraidaniel@gmail.com> | 2014-11-20 17:15:58 +0100 |
| commit | de128be17bf897a2aabdc8e746f854e8f9565200 (patch) | |
| tree | f5ef18dcba7b006b974f260fdfa1629f838d03f8 /drivers/cpufreq | |
| parent | ce636487d2453eec757b3e9a721641a3ab98787c (diff) | |
| download | kernel_samsung_tuna-de128be17bf897a2aabdc8e746f854e8f9565200.zip kernel_samsung_tuna-de128be17bf897a2aabdc8e746f854e8f9565200.tar.gz kernel_samsung_tuna-de128be17bf897a2aabdc8e746f854e8f9565200.tar.bz2 | |
cpufreq: interactive: avoid underflow on active time calculation
Check for idle time delta less than elapsed time delta, avoid
underflow computing active time.
Change-Id: I3e4c6ef1ad794eec49ed379c0c50fa727fd6ad28
Signed-off-by: Minsung Kim <ms925.kim@samsung.com>
Diffstat (limited to 'drivers/cpufreq')
| -rwxr-xr-x | drivers/cpufreq/cpufreq_interactive.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/cpufreq/cpufreq_interactive.c b/drivers/cpufreq/cpufreq_interactive.c index e5c7836..053578a 100755 --- a/drivers/cpufreq/cpufreq_interactive.c +++ b/drivers/cpufreq/cpufreq_interactive.c @@ -280,7 +280,12 @@ static u64 update_load(int cpu) now_idle = get_cpu_idle_time_us(cpu, &now); delta_idle = (unsigned int)(now_idle - pcpu->time_in_idle); delta_time = (unsigned int)(now - pcpu->time_in_idle_timestamp); - active_time = delta_time - delta_idle; + + if (delta_time <= delta_idle) + active_time = 0; + else + active_time = delta_time - delta_idle; + pcpu->cputime_speedadj += active_time * pcpu->policy->cur; pcpu->time_in_idle = now_idle; |