Re: [PATCH v2 4/9] cpufreq: governor: Initialize kobj_type release callback statically

[Zhongqiu Han]

Hi Ian,

Thanks for the update.

On 10/28/2026 6:38 AM, Ian Rogers wrote:
> Export cpufreq_dbs_data_release() and set .kobj_type.release statically
> in the ondemand and conservative governors so their gov_attr_set
> kobjects have a valid release callback statically initialized, matching
> cpufreq_governor_dbs. Remove the redundant runtime assignment in

"matching cpufreq_governor_dbs" is a bit confusing to me
(cpufreq_governor_dbs() was removed back in v4.8 by commit e788892ba3cc
("cpufreq: governor: Get rid of governor events")), as it doesn't
seem to refer to anything in the tree. Perhaps we could just drop it,
e.g.:

Export cpufreq_dbs_data_release() and initialize .kobj_type.release
statically in the ondemand and conservative governors instead of
assigning it at runtime in cpufreq_dbs_governor_init().


The code change itself looks good to me. With the changelog updated
(in a respin if the series needs one for other reasons, or when
applying):

Reviewed-by: Zhongqiu Han <zhongqiu.han@xxxxxxxxxxxxxxxx>

> cpufreq_dbs_governor_init().
>
> This prepares for annotating struct kobj_type::release with
> __must_init.
>
> Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
> ---
>   drivers/cpufreq/cpufreq_conservative.c | 5 ++++-
>   drivers/cpufreq/cpufreq_governor.c     | 4 ++--
>   drivers/cpufreq/cpufreq_governor.h     | 1 +
>   drivers/cpufreq/cpufreq_ondemand.c     | 5 ++++-
>   4 files changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
> index 02bfd46543e9..146a2353b1a2 100644
> --- a/drivers/cpufreq/cpufreq_conservative.c
> +++ b/drivers/cpufreq/cpufreq_conservative.c
> @@ -318,7 +318,10 @@ static void cs_limits(struct cpufreq_policy *policy)
>   
>   static struct dbs_governor cs_governor = {
>   	.gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("conservative"),
> -	.kobj_type = { .default_groups = cs_groups },
> +	.kobj_type = {
> +		.release = cpufreq_dbs_data_release,
> +		.default_groups = cs_groups,
> +	},
>   	.gov_dbs_update = cs_dbs_update,
>   	.alloc = cs_alloc,
>   	.free = cs_free,
> diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
> index f3bd3dbe7c41..f8b5aca09b6b 100644
> --- a/drivers/cpufreq/cpufreq_governor.c
> +++ b/drivers/cpufreq/cpufreq_governor.c
> @@ -419,7 +419,7 @@ static void free_policy_dbs_info(struct policy_dbs_info *policy_dbs,
>   	gov->free(policy_dbs);
>   }
>   
> -static void cpufreq_dbs_data_release(struct kobject *kobj)
> +void cpufreq_dbs_data_release(struct kobject *kobj)
>   {
>   	struct dbs_data *dbs_data = to_dbs_data(to_gov_attr_set(kobj));
>   	struct dbs_governor *gov = dbs_data->gov;
> @@ -427,6 +427,7 @@ static void cpufreq_dbs_data_release(struct kobject *kobj)
>   	gov->exit(dbs_data);
>   	kfree(dbs_data);
>   }
> +EXPORT_SYMBOL_GPL(cpufreq_dbs_data_release);
>   
>   int cpufreq_dbs_governor_init(struct cpufreq_policy *policy)
>   {
> @@ -488,7 +489,6 @@ int cpufreq_dbs_governor_init(struct cpufreq_policy *policy)
>   	policy->governor_data = policy_dbs;
>   
>   	gov->kobj_type.sysfs_ops = &governor_sysfs_ops;
> -	gov->kobj_type.release = cpufreq_dbs_data_release;
>   	ret = kobject_init_and_add(&dbs_data->attr_set.kobj, &gov->kobj_type,
>   				   get_governor_parent_kobj(policy),
>   				   "%s", gov->gov.name);
> diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h
> index 806d8fb4dff1..1026712bb79b 100644
> --- a/drivers/cpufreq/cpufreq_governor.h
> +++ b/drivers/cpufreq/cpufreq_governor.h
> @@ -150,6 +150,7 @@ static inline struct dbs_governor *dbs_governor_of(struct cpufreq_policy *policy
>   }
>   
>   /* Governor callback routines */
> +void cpufreq_dbs_data_release(struct kobject *kobj);
>   int cpufreq_dbs_governor_init(struct cpufreq_policy *policy);
>   void cpufreq_dbs_governor_exit(struct cpufreq_policy *policy);
>   int cpufreq_dbs_governor_start(struct cpufreq_policy *policy);
> diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
> index 9942dbb38dae..7386d043c665 100644
> --- a/drivers/cpufreq/cpufreq_ondemand.c
> +++ b/drivers/cpufreq/cpufreq_ondemand.c
> @@ -374,7 +374,10 @@ static struct od_ops od_ops = {
>   
>   static struct dbs_governor od_dbs_gov = {
>   	.gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("ondemand"),
> -	.kobj_type = { .default_groups = od_groups },
> +	.kobj_type = {
> +		.release = cpufreq_dbs_data_release,
> +		.default_groups = od_groups,
> +	},
>   	.gov_dbs_update = od_dbs_update,
>   	.alloc = od_alloc,
>   	.free = od_free,


--
Thx and BRs,
Zhongqiu Han