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| author | Stratos Karafotis <stratosk@semaphore.gr> | 2014-07-18 08:37:27 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-07-21 13:43:19 +0200 |
| commit | 78e2708691e9289f97750eb71aca31b5a2973d94 (patch) | |
| tree | 62857f16ff381de7fcf982a7b4d8c1bd69834f8c /drivers/cpufreq | |
| parent | 4b707c893d0937be9c7be437950a312fbaf47601 (diff) | |
| download | talos-obmc-linux-78e2708691e9289f97750eb71aca31b5a2973d94.tar.gz talos-obmc-linux-78e2708691e9289f97750eb71aca31b5a2973d94.zip | |
cpufreq: intel_pstate: Remove core_pct rounding
The specific rounding adds conditionally only 1/256 to fractional
part of core_pct.
We can safely remove it without any noticeable impact in
calculations.
Use div64_u64 instead of div_u64 to avoid possible overflow of
sample->mperf as divisor
Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 2ff85f665f93..c5eac949760d 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -545,13 +545,9 @@ static inline void intel_pstate_calc_busy(struct cpudata *cpu) { struct sample *sample = &cpu->sample; int64_t core_pct; - int32_t rem; core_pct = int_tofp(sample->aperf) * int_tofp(100); - core_pct = div_u64_rem(core_pct, int_tofp(sample->mperf), &rem); - - if ((rem << 1) >= int_tofp(sample->mperf)) - core_pct += 1; + core_pct = div64_u64(core_pct, int_tofp(sample->mperf)); sample->freq = fp_toint( mul_fp(int_tofp(cpu->pstate.max_pstate * 1000), core_pct)); |
