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

Lifeng Zheng posted 3 patches 5 months, 3 weeks ago
[PATCH v5 2/3] cpufreq: Add a new function to get cpufreq policy without checking if the CPU is online
Posted by Lifeng Zheng 5 months, 3 weeks ago 
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.

Signed-off-by: Lifeng Zheng <zhenglifeng1@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
Re: [PATCH v5 2/3] cpufreq: Add a new function to get cpufreq policy without checking if the CPU is online
Posted by Jie Zhan 5 months, 2 weeks ago 

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@hisilicon.com>
> Signed-off-by: Lifeng Zheng <zhenglifeng1@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;
Re: [PATCH v5 2/3] cpufreq: Add a new function to get cpufreq policy without checking if the CPU is online
Posted by Rafael J. Wysocki 5 months, 3 weeks ago 
On Tue, Aug 19, 2025 at 9:30 AM Lifeng Zheng <zhenglifeng1@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@kernel.org>

> Signed-off-by: Lifeng Zheng <zhenglifeng1@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
>
>
Re: [PATCH v5 2/3] cpufreq: Add a new function to get cpufreq policy without checking if the CPU is online
Posted by zhenglifeng (A) 5 months, 3 weeks ago 
On 2025/8/20 3:05, Rafael J. Wysocki wrote:

> On Tue, Aug 19, 2025 at 9:30 AM Lifeng Zheng <zhenglifeng1@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@kernel.org>

Thanks! Will shorten it in the next version.

> 
>> Signed-off-by: Lifeng Zheng <zhenglifeng1@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
>>
>>
>

Patchew 2.1-devel-b67e4c2

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