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[-next v2 2/4] cpuset: decouple tmpmaks and cpumaks of cs free

Chen Ridong posted 4 patches 4 months ago
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[-next v2 2/4] cpuset: decouple tmpmaks and cpumaks of cs free
Posted by Chen Ridong 4 months ago 
From: Chen Ridong <chenridong@huawei.com>

Currently, free_cpumasks can free tmpmasks of cpumask of cs. However, it
doesn't have couple these 2 options. To make the function more clearer,
move the freeing of cpumask in cs to the free_cpuset. And rename the
free_cpumasks to the free_tmpmasks. which is Single responsibility.

Signed-off-by: Chen Ridong <chenridong@huawei.com>
---
 kernel/cgroup/cpuset.c | 32 +++++++++++++-------------------
 1 file changed, 13 insertions(+), 19 deletions(-)

diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 3466ebbf1016..aebda14cc67f 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -459,23 +459,14 @@ static inline int alloc_cpumasks(struct cpuset *cs, struct tmpmasks *tmp)
 }
 
 /**
- * free_cpumasks - free cpumasks in a tmpmasks structure
- * @cs:  the cpuset that have cpumasks to be free.
+ * free_tmpmasks - free cpumasks in a tmpmasks structure
  * @tmp: the tmpmasks structure pointer
  */
-static inline void free_cpumasks(struct cpuset *cs, struct tmpmasks *tmp)
+static inline void free_tmpmasks(struct tmpmasks *tmp)
 {
-	if (cs) {
-		free_cpumask_var(cs->cpus_allowed);
-		free_cpumask_var(cs->effective_cpus);
-		free_cpumask_var(cs->effective_xcpus);
-		free_cpumask_var(cs->exclusive_cpus);
-	}
-	if (tmp) {
-		free_cpumask_var(tmp->new_cpus);
-		free_cpumask_var(tmp->addmask);
-		free_cpumask_var(tmp->delmask);
-	}
+	free_cpumask_var(tmp->new_cpus);
+	free_cpumask_var(tmp->addmask);
+	free_cpumask_var(tmp->delmask);
 }
 
 /**
@@ -508,7 +499,10 @@ static struct cpuset *alloc_trial_cpuset(struct cpuset *cs)
  */
 static inline void free_cpuset(struct cpuset *cs)
 {
-	free_cpumasks(cs, NULL);
+	free_cpumask_var(cs->cpus_allowed);
+	free_cpumask_var(cs->effective_cpus);
+	free_cpumask_var(cs->effective_xcpus);
+	free_cpumask_var(cs->exclusive_cpus);
 	kfree(cs);
 }
 
@@ -2427,7 +2421,7 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
 	if (cs->partition_root_state)
 		update_partition_sd_lb(cs, old_prs);
 out_free:
-	free_cpumasks(NULL, &tmp);
+	free_tmpmasks(&tmp);
 	return retval;
 }
 
@@ -2530,7 +2524,7 @@ static int update_exclusive_cpumask(struct cpuset *cs, struct cpuset *trialcs,
 	if (cs->partition_root_state)
 		update_partition_sd_lb(cs, old_prs);
 
-	free_cpumasks(NULL, &tmp);
+	free_tmpmasks(&tmp);
 	return 0;
 }
 
@@ -2983,7 +2977,7 @@ static int update_prstate(struct cpuset *cs, int new_prs)
 	notify_partition_change(cs, old_prs);
 	if (force_sd_rebuild)
 		rebuild_sched_domains_locked();
-	free_cpumasks(NULL, &tmpmask);
+	free_tmpmasks(&tmpmask);
 	return 0;
 }
 
@@ -4006,7 +4000,7 @@ static void cpuset_handle_hotplug(void)
 	if (force_sd_rebuild)
 		rebuild_sched_domains_cpuslocked();
 
-	free_cpumasks(NULL, ptmp);
+	free_tmpmasks(ptmp);
 }
 
 void cpuset_update_active_cpus(void)
-- 
2.34.1
Re: [-next v2 2/4] cpuset: decouple tmpmaks and cpumaks of cs free
Posted by Waiman Long 4 months ago 
On 8/13/25 4:29 AM, Chen Ridong wrote:
> From: Chen Ridong <chenridong@huawei.com>
>
> Currently, free_cpumasks can free tmpmasks of cpumask of cs. However, it
> doesn't have couple these 2 options. To make the function more clearer,
> move the freeing of cpumask in cs to the free_cpuset. And rename the
> free_cpumasks to the free_tmpmasks. which is Single responsibility.
>
> Signed-off-by: Chen Ridong <chenridong@huawei.com>

Other than typos in the patch title, the code change looks good to me.

Cheers,
Longman

> ---
>   kernel/cgroup/cpuset.c | 32 +++++++++++++-------------------
>   1 file changed, 13 insertions(+), 19 deletions(-)
>
> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
> index 3466ebbf1016..aebda14cc67f 100644
> --- a/kernel/cgroup/cpuset.c
> +++ b/kernel/cgroup/cpuset.c
> @@ -459,23 +459,14 @@ static inline int alloc_cpumasks(struct cpuset *cs, struct tmpmasks *tmp)
>   }
>   
>   /**
> - * free_cpumasks - free cpumasks in a tmpmasks structure
> - * @cs:  the cpuset that have cpumasks to be free.
> + * free_tmpmasks - free cpumasks in a tmpmasks structure
>    * @tmp: the tmpmasks structure pointer
>    */
> -static inline void free_cpumasks(struct cpuset *cs, struct tmpmasks *tmp)
> +static inline void free_tmpmasks(struct tmpmasks *tmp)
>   {
> -	if (cs) {
> -		free_cpumask_var(cs->cpus_allowed);
> -		free_cpumask_var(cs->effective_cpus);
> -		free_cpumask_var(cs->effective_xcpus);
> -		free_cpumask_var(cs->exclusive_cpus);
> -	}
> -	if (tmp) {
> -		free_cpumask_var(tmp->new_cpus);
> -		free_cpumask_var(tmp->addmask);
> -		free_cpumask_var(tmp->delmask);
> -	}
> +	free_cpumask_var(tmp->new_cpus);
> +	free_cpumask_var(tmp->addmask);
> +	free_cpumask_var(tmp->delmask);
>   }
>   
>   /**
> @@ -508,7 +499,10 @@ static struct cpuset *alloc_trial_cpuset(struct cpuset *cs)
>    */
>   static inline void free_cpuset(struct cpuset *cs)
>   {
> -	free_cpumasks(cs, NULL);
> +	free_cpumask_var(cs->cpus_allowed);
> +	free_cpumask_var(cs->effective_cpus);
> +	free_cpumask_var(cs->effective_xcpus);
> +	free_cpumask_var(cs->exclusive_cpus);
>   	kfree(cs);
>   }
>   
> @@ -2427,7 +2421,7 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
>   	if (cs->partition_root_state)
>   		update_partition_sd_lb(cs, old_prs);
>   out_free:
> -	free_cpumasks(NULL, &tmp);
> +	free_tmpmasks(&tmp);
>   	return retval;
>   }
>   
> @@ -2530,7 +2524,7 @@ static int update_exclusive_cpumask(struct cpuset *cs, struct cpuset *trialcs,
>   	if (cs->partition_root_state)
>   		update_partition_sd_lb(cs, old_prs);
>   
> -	free_cpumasks(NULL, &tmp);
> +	free_tmpmasks(&tmp);
>   	return 0;
>   }
>   
> @@ -2983,7 +2977,7 @@ static int update_prstate(struct cpuset *cs, int new_prs)
>   	notify_partition_change(cs, old_prs);
>   	if (force_sd_rebuild)
>   		rebuild_sched_domains_locked();
> -	free_cpumasks(NULL, &tmpmask);
> +	free_tmpmasks(&tmpmask);
>   	return 0;
>   }
>   
> @@ -4006,7 +4000,7 @@ static void cpuset_handle_hotplug(void)
>   	if (force_sd_rebuild)
>   		rebuild_sched_domains_cpuslocked();
>   
> -	free_cpumasks(NULL, ptmp);
> +	free_tmpmasks(ptmp);
>   }
>   
>   void cpuset_update_active_cpus(void)
Re: [-next v2 2/4] cpuset: decouple tmpmaks and cpumaks of cs free
Posted by Chen Ridong 4 months ago 

On 2025/8/14 3:50, Waiman Long wrote:
> On 8/13/25 4:29 AM, Chen Ridong wrote:
>> From: Chen Ridong <chenridong@huawei.com>
>>
>> Currently, free_cpumasks can free tmpmasks of cpumask of cs. However, it
>> doesn't have couple these 2 options. To make the function more clearer,
>> move the freeing of cpumask in cs to the free_cpuset. And rename the
>> free_cpumasks to the free_tmpmasks. which is Single responsibility.
>>
>> Signed-off-by: Chen Ridong <chenridong@huawei.com>
> 
> Other than typos in the patch title, the code change looks good to me.
> 
> Cheers,
> Longman

Thank you for your feedback.
I apologize for the typos—I will correct them promptly.

Best regards,
Ridong

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