[RFC PATCH 1/2] PM: EM: Export em_table_alloc/free

[RFC PATCH 1/2] PM: EM: Export em_table_alloc/free

[Xuewen Yan]

When drivers wants to alloc a new em_perf_table to update
their em_perf_table, they need to use em_table_alloc and
em_table_free.
So export the two func.

Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com>
---
 kernel/power/energy_model.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
index e610cf8e9a06..277aaf1b19da 100644
--- a/kernel/power/energy_model.c
+++ b/kernel/power/energy_model.c
@@ -201,6 +201,7 @@ void em_table_free(struct em_perf_table *table)
 {
 	kref_put(&table->kref, em_release_table_kref);
 }
+EXPORT_SYMBOL_GPL(em_table_free);
 
 /**
  * em_table_alloc() - Allocate a new EM table
@@ -225,6 +226,7 @@ struct em_perf_table *em_table_alloc(struct em_perf_domain *pd)
 
 	return table;
 }
+EXPORT_SYMBOL_GPL(em_table_alloc);
 
 static void em_init_performance(struct device *dev, struct em_perf_domain *pd,
 				struct em_perf_state *table, int nr_states)
-- 
2.25.1

[RFC PATCH 2/2] PM: EM: Validate new_table in em_dev_update_perf_domain()

[Xuewen Yan]

Add an explicit check for the new_table parameter in
em_dev_update_perf_domain() to ensure it is not NULL or an
ERR_PTR before proceeding with the update.

Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com>
---
 kernel/power/energy_model.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
index 277aaf1b19da..4d75e1b3c20e 100644
--- a/kernel/power/energy_model.c
+++ b/kernel/power/energy_model.c
@@ -331,7 +331,7 @@ int em_dev_update_perf_domain(struct device *dev,
 	struct em_perf_table *old_table;
 	struct em_perf_domain *pd;
 
-	if (!dev)
+	if (!dev || IS_ERR_OR_NULL(new_table))
 		return -EINVAL;
 
 	/* Serialize update/unregister or concurrent updates */
-- 
2.25.1

Re: [RFC PATCH 2/2] PM: EM: Validate new_table in em_dev_update_perf_domain()

[Lukasz Luba]

On 7/10/26 09:24, Xuewen Yan wrote:
> Add an explicit check for the new_table parameter in
> em_dev_update_perf_domain() to ensure it is not NULL or an
> ERR_PTR before proceeding with the update.
> 
> Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com>
> ---
>   kernel/power/energy_model.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
> index 277aaf1b19da..4d75e1b3c20e 100644
> --- a/kernel/power/energy_model.c
> +++ b/kernel/power/energy_model.c
> @@ -331,7 +331,7 @@ int em_dev_update_perf_domain(struct device *dev,
>   	struct em_perf_table *old_table;
>   	struct em_perf_domain *pd;
>   
> -	if (!dev)
> +	if (!dev || IS_ERR_OR_NULL(new_table))
>   		return -EINVAL;
>   
>   	/* Serialize update/unregister or concurrent updates */


Make sense to check that and catch possible issue this way.

Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>

Re: [RFC PATCH 1/2] PM: EM: Export em_table_alloc/free

[Lukasz Luba]

On 7/10/26 09:24, Xuewen Yan wrote:
> When drivers wants to alloc a new em_perf_table to update
> their em_perf_table, they need to use em_table_alloc and
> em_table_free.
> So export the two func.
> 
> Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com>
> ---
>   kernel/power/energy_model.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/power/energy_model.c b/kernel/power/energy_model.c
> index e610cf8e9a06..277aaf1b19da 100644
> --- a/kernel/power/energy_model.c
> +++ b/kernel/power/energy_model.c
> @@ -201,6 +201,7 @@ void em_table_free(struct em_perf_table *table)
>   {
>   	kref_put(&table->kref, em_release_table_kref);
>   }
> +EXPORT_SYMBOL_GPL(em_table_free);
>   
>   /**
>    * em_table_alloc() - Allocate a new EM table
> @@ -225,6 +226,7 @@ struct em_perf_table *em_table_alloc(struct em_perf_domain *pd)
>   
>   	return table;
>   }
> +EXPORT_SYMBOL_GPL(em_table_alloc);
>   
>   static void em_init_performance(struct device *dev, struct em_perf_domain *pd,
>   				struct em_perf_state *table, int nr_states)

LGTM,

Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>

Re: [RFC PATCH 1/2] PM: EM: Export em_table_alloc/free

[Christoph Hellwig]

On Fri, Jul 10, 2026 at 04:24:46PM +0800, Xuewen Yan wrote:
> When drivers wants to alloc a new em_perf_table to update
> their em_perf_table, they need to use em_table_alloc and
> em_table_free.
> So export the two func.

Please send this along with the driver actually using it.