cpuset: add helpers for cpus read and cpuset_mutex locks

cpuset: add helpers for cpus_read_lock and cpuset_mutex locks.

Replace repetitive locking patterns with new helpers:
- cpuset_full_lock()
- cpuset_full_unlock()

This makes the code cleaner and ensures consistent lock ordering.

Signed-off-by: Chen Ridong <[e-mail]>
Reviewed-by: Waiman Long <[e-mail]>
Signed-off-by: Tejun Heo <[e-mail]>

kernel/cgroup/cpuset-internal.h

···
 ssize_t cpuset_write_resmask(struct kernfs_open_file *of,
 				    char *buf, size_t nbytes, loff_t off);
 int cpuset_common_seq_show(struct seq_file *sf, void *v);
+void cpuset_full_lock(void);
+void cpuset_full_unlock(void);
 
 /*
  * cpuset-v1.c

kernel/cgroup/cpuset-v1.c

···
 	cpuset_filetype_t type = cft->private;
 	int retval = -ENODEV;
 
-	cpus_read_lock();
-	cpuset_lock();
+	cpuset_full_lock();
 	if (!is_cpuset_online(cs))
 		goto out_unlock;
 
···
 		break;
 	}
 out_unlock:
-	cpuset_unlock();
-	cpus_read_unlock();
+	cpuset_full_unlock();
 	return retval;
 }
 
···
 	cpuset_filetype_t type = cft->private;
 	int retval = 0;
 
-	cpus_read_lock();
-	cpuset_lock();
+	cpuset_full_lock();
 	if (!is_cpuset_online(cs)) {
 		retval = -ENODEV;
 		goto out_unlock;
···
 		break;
 	}
 out_unlock:
-	cpuset_unlock();
-	cpus_read_unlock();
+	cpuset_full_unlock();
 	return retval;
 }
 

kernel/cgroup/cpuset.c

···
 
 static DEFINE_MUTEX(cpuset_mutex);
 
+/**
+ * cpuset_lock - Acquire the global cpuset mutex
+ *
+ * This locks the global cpuset mutex to prevent modifications to cpuset
+ * hierarchy and configurations. This helper is not enough to make modification.
+ */
 void cpuset_lock(void)
 {
 	mutex_lock(&cpuset_mutex);
···
 void cpuset_unlock(void)
 {
 	mutex_unlock(&cpuset_mutex);
+}
+
+/**
+ * cpuset_full_lock - Acquire full protection for cpuset modification
+ *
+ * Takes both CPU hotplug read lock (cpus_read_lock()) and cpuset mutex
+ * to safely modify cpuset data.
+ */
+void cpuset_full_lock(void)
+{
+	cpus_read_lock();
+	mutex_lock(&cpuset_mutex);
+}
+
+void cpuset_full_unlock(void)
+{
+	mutex_unlock(&cpuset_mutex);
+	cpus_read_unlock();
 }
 
 static DEFINE_SPINLOCK(callback_lock);
···
 	int retval = -ENODEV;
 
 	buf = strstrip(buf);
-	cpus_read_lock();
-	mutex_lock(&cpuset_mutex);
+	cpuset_full_lock();
 	if (!is_cpuset_online(cs))
 		goto out_unlock;
 
···
 	if (force_sd_rebuild)
 		rebuild_sched_domains_locked();
 out_unlock:
-	mutex_unlock(&cpuset_mutex);
-	cpus_read_unlock();
+	cpuset_full_unlock();
 	flush_workqueue(cpuset_migrate_mm_wq);
 	return retval ?: nbytes;
 }
···
 	else
 		return -EINVAL;
 
-	cpus_read_lock();
-	mutex_lock(&cpuset_mutex);
+	cpuset_full_lock();
 	if (is_cpuset_online(cs))
 		retval = update_prstate(cs, val);
-	mutex_unlock(&cpuset_mutex);
-	cpus_read_unlock();
+	cpuset_full_unlock();
 	return retval ?: nbytes;
 }
 
···
 	if (!parent)
 		return 0;
 
-	cpus_read_lock();
-	mutex_lock(&cpuset_mutex);
-
+	cpuset_full_lock();
 	if (is_spread_page(parent))
 		set_bit(CS_SPREAD_PAGE, &cs->flags);
 	if (is_spread_slab(parent))
···
 	cpumask_copy(cs->effective_cpus, parent->cpus_allowed);
 	spin_unlock_irq(&callback_lock);
 out_unlock:
-	mutex_unlock(&cpuset_mutex);
-	cpus_read_unlock();
+	cpuset_full_unlock();
 	return 0;
 }
 
···
 {
 	struct cpuset *cs = css_cs(css);
 
-	cpus_read_lock();
-	mutex_lock(&cpuset_mutex);
-
+	cpuset_full_lock();
 	if (!cpuset_v2() && is_sched_load_balance(cs))
 		cpuset_update_flag(CS_SCHED_LOAD_BALANCE, cs, 0);
 
 	cpuset_dec();
-
-	mutex_unlock(&cpuset_mutex);
-	cpus_read_unlock();
+	cpuset_full_unlock();
 }
 
 /*
···
 {
 	struct cpuset *cs = css_cs(css);
 
-	cpus_read_lock();
-	mutex_lock(&cpuset_mutex);
-
+	cpuset_full_lock();
 	/* Reset valid partition back to member */
 	if (is_partition_valid(cs))
 		update_prstate(cs, PRS_MEMBER);
-
-	mutex_unlock(&cpuset_mutex);
-	cpus_read_unlock();
-
+	cpuset_full_unlock();
 }
 
 static void cpuset_css_free(struct cgroup_subsys_state *css)