intel_pstate: Improve initial busy calculation
This change makes the busy calculation using 64 bit math which prevents overflow for large values of aperf/mperf. Cc: 3.14+ <stable@vger.kernel.org> # 3.14+ Signed-off-by: Doug Smythies <dsmythies@telus.net> Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -563,16 +563,19 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
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static inline void intel_pstate_calc_busy(struct cpudata *cpu,
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struct sample *sample)
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{
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int32_t core_pct;
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int64_t core_pct;
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int32_t rem;
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core_pct = div_fp(int_tofp((sample->aperf)),
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int_tofp((sample->mperf)));
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core_pct = mul_fp(core_pct, int_tofp(100));
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core_pct = int_tofp(sample->aperf) * int_tofp(100);
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core_pct = div_u64_rem(core_pct, int_tofp(sample->mperf), &rem);
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if ((rem << 1) >= int_tofp(sample->mperf))
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core_pct += 1;
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sample->freq = fp_toint(
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mul_fp(int_tofp(cpu->pstate.max_pstate * 1000), core_pct));
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sample->core_pct_busy = core_pct;
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sample->core_pct_busy = (int32_t)core_pct;
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}
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static inline void intel_pstate_sample(struct cpudata *cpu)
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