ACK: [PATCH] cpu: cpufreq: add init function to determine number of CPUs

[Alex Hung]

On 10/21/2012 03:54 AM, Colin King wrote:
> From: Colin Ian King <colin.king at canonical.com>
>
> Rather than call sysconf() multiple times just evaluate the
> number of CPUs once and use the fwts_cpu_enumerate() helper
> to enumerate the number of cpus rather than sysconf().
>
> Signed-off-by: Colin Ian King <colin.king at canonical.com>
> ---
>   src/cpu/cpufreq/cpufreq.c |   15 +++++++++++++--
>   1 file changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/src/cpu/cpufreq/cpufreq.c b/src/cpu/cpufreq/cpufreq.c
> index 48e8c6d..9efe4f0 100644
> --- a/src/cpu/cpufreq/cpufreq.c
> +++ b/src/cpu/cpufreq/cpufreq.c
> @@ -50,6 +50,7 @@ static int total_tests = 1;
>   static int performed_tests = 0;
>   static int no_cpufreq = 0;
>   static unsigned long top_speed = 0;
> +static int num_cpus;
>
>   #define GET_PERFORMANCE_MAX (0)
>   #define GET_PERFORMANCE_MIN (1)
> @@ -284,7 +285,7 @@ static void do_cpu(fwts_framework *fw, int cpu)
>
>   	if (total_tests == 1)
>   		total_tests = (2+count_ints(line)) *
> -			sysconf(_SC_NPROCESSORS_CONF) + 2;
> +			num_cpus + 2;
>
>   	c = line;
>   	i = 0;
> @@ -667,7 +668,7 @@ static int cpufreq_test1(fwts_framework *fw)
>   	 * Check for more than one CPU and more than one frequency and
>   	 * then do the benchmark set 2
>   	 */
> -	if (sysconf(_SC_NPROCESSORS_CONF) > 1 && number_of_speeds > 1) {
> +	if (num_cpus > 1 && number_of_speeds > 1) {
>   		do_sw_all_test(fw);
>   		performed_tests++;
>   		fwts_progress(fw, 100 * performed_tests/total_tests);
> @@ -684,12 +685,22 @@ static int cpufreq_test1(fwts_framework *fw)
>   	return FWTS_OK;
>   }
>
> +static int cpufreq_init(fwts_framework *fw)
> +{
> +	if ((num_cpus = fwts_cpu_enumerate()) == FWTS_ERROR) {
> +		fwts_log_warning(fw, "Cannot determine number of CPUS, defaulting to 1.");
> +		num_cpus = 1;
> +	}
> +	return FWTS_OK;
> +}
> +
>   static fwts_framework_minor_test cpufreq_tests[] = {
>   	{ cpufreq_test1, "CPU P-State Checks." },
>   	{ NULL, NULL }
>   };
>
>   static fwts_framework_ops cpufreq_ops = {
> +	.init        = cpufreq_init,
>   	.description = "CPU frequency scaling tests (takes ~1-2 mins).",
>   	.minor_tests = cpufreq_tests
>   };
>
Acked-by: Alex Hung <alex.hung at canonical.com>