linux-kernel - Re: [PATCH v2 10/21] cpufreq: intel_pstate: use match

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Date:   Tue, 26 Jun 2018 17:23:10 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Yisheng Xie <xieyisheng1@...wei.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, andy.shevchenko@...il.com,
        Len Brown <lenb@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 10/21] cpufreq: intel_pstate: use match_string() helper

On Thursday, May 31, 2018 1:11:15 PM CEST Yisheng Xie wrote:
> match_string() returns the index of an array for a matching string,
> which can be used instead of open coded variant.
> 
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> Cc: Len Brown <lenb@...nel.org>
> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
> Cc: Viresh Kumar <viresh.kumar@...aro.org>
> Cc: linux-pm@...r.kernel.org
> Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
> ---
> v2:
>  - add Reviewed-by tag.
> 
>  drivers/cpufreq/intel_pstate.c | 15 ++++++---------
>  1 file changed, 6 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index 17e566af..d701e26 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -645,21 +645,18 @@ static ssize_t store_energy_performance_preference(
>  {
>  	struct cpudata *cpu_data = all_cpu_data[policy->cpu];
>  	char str_preference[21];
> -	int ret, i = 0;
> +	int ret;
>  
>  	ret = sscanf(buf, "%20s", str_preference);
>  	if (ret != 1)
>  		return -EINVAL;
>  
> -	while (energy_perf_strings[i] != NULL) {
> -		if (!strcmp(str_preference, energy_perf_strings[i])) {
> -			intel_pstate_set_energy_pref_index(cpu_data, i);
> -			return count;
> -		}
> -		++i;
> -	}
> +	ret = match_string(energy_perf_strings, -1, str_preference);
> +	if (ret < 0)
> +		return ret;
>  
> -	return -EINVAL;
> +	intel_pstate_set_energy_pref_index(cpu_data, ret);
> +	return count;
>  }
>  
>  static ssize_t show_energy_performance_preference(
> 

Srinivas, any concerns?