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

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Message-ID: <4639ba1d-110b-9000-f2a9-7bb1cacf8d63@hisilicon.com>
Date: Sat, 30 Aug 2025 12:11:03 +0800
From: Jie Zhan <zhanjie9@...ilicon.com>
To: Lifeng Zheng <zhenglifeng1@...wei.com>, <catalin.marinas@....com>,
	<will@...nel.org>, <rafael@...nel.org>, <viresh.kumar@...aro.org>,
	<beata.michalska@....com>, <sudeep.holla@....com>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
	<jonathan.cameron@...wei.com>, <vincent.guittot@...aro.org>,
	<yangyicong@...ilicon.com>, <lihuisong@...wei.com>, <yubowen8@...wei.com>,
	<zhangpengjie2@...wei.com>, <linhongye@...artners.com>
Subject: Re: [PATCH v5 2/3] cpufreq: Add a new function to get cpufreq policy
 without checking if the CPU is online



On 19/08/2025 15:29, Lifeng Zheng 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.
> 
LGTM.

Reviewed-by: Jie Zhan <zhanjie9@...ilicon.com>
> Signed-off-by: Lifeng Zheng <zhenglifeng1@...wei.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;