linux-kernel - Re: [PATCH] cpufreq: intel_pstate: Remove sample parameter in intel_pstate_calc

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Date:	Thu, 01 May 2014 09:04:25 -0700
From:	Dirk Brandewie <dirk.brandewie@...il.com>
To:	Stratos Karafotis <stratosk@...aphore.gr>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>
CC:	dirk.j.brandewie@...el.com,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpufreq: intel_pstate: Remove sample parameter in intel_pstate_calc_busy

On 04/29/2014 10:53 AM, Stratos Karafotis wrote:
> Since commit d37e2b7644 ("intel_pstate: remove unneeded sample buffers")
> we use only one sample. So, there is no need to pass the sample
> pointer to intel_pstate_calc_busy. Instead, get the pointer from
> cpudata. Also, remove the unused SAMPLE_COUNT macro.
>
> While at it, reformat the first line in this function.
>
> Signed-off-by: Stratos Karafotis <stratosk@...aphore.gr>

Acked-by: Dirk Brandewie <dirk.j.brandewie@...el.com>

> ---
>   drivers/cpufreq/intel_pstate.c | 11 ++++-------
>   1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index 95b3958..8192ff1 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -32,8 +32,6 @@
>   #include <asm/msr.h>
>   #include <asm/cpu_device_id.h>
>
> -#define SAMPLE_COUNT		3
> -
>   #define BYT_RATIOS		0x66a
>   #define BYT_VIDS		0x66b
>   #define BYT_TURBO_RATIOS	0x66c
> @@ -553,14 +551,13 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
>   	intel_pstate_set_pstate(cpu, cpu->pstate.max_pstate);
>   }
>
> -static inline void intel_pstate_calc_busy(struct cpudata *cpu,
> -					struct sample *sample)
> +static inline void intel_pstate_calc_busy(struct cpudata *cpu)
>   {
> +	struct sample *sample = &cpu->sample;
>   	int32_t core_pct;
>   	int32_t c0_pct;
>
> -	core_pct = div_fp(int_tofp((sample->aperf)),
> -			int_tofp((sample->mperf)));
> +	core_pct = div_fp(int_tofp(sample->aperf), int_tofp(sample->mperf));
>   	core_pct = mul_fp(core_pct, int_tofp(100));
>   	FP_ROUNDUP(core_pct);
>
> @@ -595,7 +592,7 @@ static inline void intel_pstate_sample(struct cpudata *cpu)
>   	cpu->sample.mperf -= cpu->prev_mperf;
>   	cpu->sample.tsc -= cpu->prev_tsc;
>
> -	intel_pstate_calc_busy(cpu, &cpu->sample);
> +	intel_pstate_calc_busy(cpu);
>
>   	cpu->prev_aperf = aperf;
>   	cpu->prev_mperf = mperf;
>

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