[PATCH v5 2/3] cpufreq: Add a new function to get cpufreq policy without checking if the CPU is online

[Rafael J. Wysocki]

On Tue, Aug 19, 2025 at 9:30 AM Lifeng Zheng <zhenglifeng1 at huawei.com> wrote:
>
> cpufreq_cpu_get_raw() gets cpufreq policy only if the CPU is in
> policy->cpus mask, which means the CPU is already online. But in some
> cases, the policy is needed before the CPU is added to cpus mask. Add a
> function to get the policy in these cases.

I'd prefer the subject to be somewhat shorter.  For instance, something like

cpufreq: Add new helper function returning cpufreq policy

would suffice because the changelog explains the details.

With that addressed

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

> Signed-off-by: Lifeng Zheng <zhenglifeng1 at huawei.com>
> ---
>  drivers/cpufreq/cpufreq.c | 6 ++++++
>  include/linux/cpufreq.h   | 5 +++++
>  2 files changed, 11 insertions(+)
>
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index fc7eace8b65b..78ca68ea754d 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -198,6 +198,12 @@ struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
>  }
>  EXPORT_SYMBOL_GPL(cpufreq_cpu_get_raw);
>
> +struct cpufreq_policy *cpufreq_cpu_policy(unsigned int cpu)
> +{
> +       return per_cpu(cpufreq_cpu_data, cpu);
> +}
> +EXPORT_SYMBOL_GPL(cpufreq_cpu_policy);
> +
>  unsigned int cpufreq_generic_get(unsigned int cpu)
>  {
>         struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
> diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
> index 95f3807c8c55..26b3c3310d5b 100644
> --- a/include/linux/cpufreq.h
> +++ b/include/linux/cpufreq.h
> @@ -205,6 +205,7 @@ struct cpufreq_freqs {
>
>  #ifdef CONFIG_CPU_FREQ
>  struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
> +struct cpufreq_policy *cpufreq_cpu_policy(unsigned int cpu);
>  struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
>  void cpufreq_cpu_put(struct cpufreq_policy *policy);
>  #else
> @@ -212,6 +213,10 @@ static inline struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
>  {
>         return NULL;
>  }
> +static inline struct cpufreq_policy *cpufreq_cpu_policy(unsigned int cpu)
> +{
> +       return NULL;
> +}
>  static inline struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
>  {
>         return NULL;
> --
> 2.33.0
>
>