[PATCH 07/15] cpufreq: ondemand: Simplify idle cputime granularity test

[Rafael J. Wysocki]

On Fri, Jan 16, 2026 at 3:53 PM Frederic Weisbecker <frederic at kernel.org> wrote:
>
> cpufreq calls get_cpu_idle_time_us() just to know if idle cputime
> accounting has a nanoseconds granularity.
>
> Use the appropriate indicator instead to make that deduction.
>
> Signed-off-by: Frederic Weisbecker <frederic at kernel.org>

Acked-by: Rafael J. Wysocki (Intel) <rafael at kernel.org>

or please let me know if you want me to take this patch.

> ---
>  drivers/cpufreq/cpufreq_ondemand.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
>
> diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
> index a6ecc203f7b7..2d52ee035702 100644
> --- a/drivers/cpufreq/cpufreq_ondemand.c
> +++ b/drivers/cpufreq/cpufreq_ondemand.c
> @@ -334,17 +334,12 @@ static void od_free(struct policy_dbs_info *policy_dbs)
>  static int od_init(struct dbs_data *dbs_data)
>  {
>         struct od_dbs_tuners *tuners;
> -       u64 idle_time;
> -       int cpu;
>
>         tuners = kzalloc(sizeof(*tuners), GFP_KERNEL);
>         if (!tuners)
>                 return -ENOMEM;
>
> -       cpu = get_cpu();
> -       idle_time = get_cpu_idle_time_us(cpu, NULL);
> -       put_cpu();
> -       if (idle_time != -1ULL) {
> +       if (tick_nohz_enabled) {
>                 /* Idle micro accounting is supported. Use finer thresholds */
>                 dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
>         } else {
> --
> 2.51.1
>
>