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cpufreq: interactive governor drops bits in time calculation 

Keep time calculation in 64-bit throughout. If we have long times
between idle calculations this can result in deltas > 32 bits
which causes incorrect load percentage calculations and selecting
the wrong frequencies if we truncate here.

Signed-off-by: Chris Redpath <chris.redpath@arm.com>
Signed-off-by: Alex Naidis <alex.naidis@linux.com>
Git-commit: 865c05d076acdc1e943b0e04f96721546a2e74ca
Git-repo: https://android.googlesource.com/kernel/common.git
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>
This commit is contained in:
Chris Redpath 2013-06-17 18:36:56 +01:00 committed by syphyr
parent a8485c865e
commit d127423a30
1 changed files with 4 additions and 4 deletions
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8
drivers/cpufreq/cpufreq_interactive.c
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@ -380,13 +380,13 @@ static u64 update_load(int cpu)
pcpu->policy->governor_data;
u64 now;
u64 now_idle;
unsigned int delta_idle;
unsigned int delta_time;
u64 delta_idle;
u64 delta_time;
u64 active_time;
now_idle = get_cpu_idle_time(cpu, &now, tunables->io_is_busy);
delta_idle = (unsigned int)(now_idle - pcpu->time_in_idle);
delta_time = (unsigned int)(now - pcpu->time_in_idle_timestamp);
delta_idle = (now_idle - pcpu->time_in_idle);
delta_time = (now - pcpu->time_in_idle_timestamp);
if (delta_time <= delta_idle)
active_time = 0;