cpuset: add lockdep_assert_cpuset_lock_held helper

Chen Ridong · htejun · commit 14c11e1b2ac4 · 2025-12-18T08:35:57.000-10:00
Add lockdep_assert_cpuset_lock_held() to allow other subsystems to verify
that cpuset_mutex is held.

Suggested-by: Waiman Long &lt;longman@redhat.com&gt;
Signed-off-by: Chen Ridong &lt;chenridong@huawei.com&gt;
Reviewed-by: Waiman Long &lt;longman@redhat.com&gt;
Signed-off-by: Tejun Heo &lt;tj@kernel.org&gt;
diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
@@ -74,6 +74,7 @@ extern void inc_dl_tasks_cs(struct task_struct *task);
 extern void dec_dl_tasks_cs(struct task_struct *task);
 extern void cpuset_lock(void);
 extern void cpuset_unlock(void);
+extern void lockdep_assert_cpuset_lock_held(void);
 extern void cpuset_cpus_allowed_locked(struct task_struct *p, struct cpumask *mask);
 extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
 extern bool cpuset_cpus_allowed_fallback(struct task_struct *p);
@@ -195,6 +196,7 @@ static inline void inc_dl_tasks_cs(struct task_struct *task) { }
 static inline void dec_dl_tasks_cs(struct task_struct *task) { }
 static inline void cpuset_lock(void) { }
 static inline void cpuset_unlock(void) { }
+static inline void lockdep_assert_cpuset_lock_held(void) { }
 
 static inline void cpuset_cpus_allowed_locked(struct task_struct *p,
 					struct cpumask *mask)
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
@@ -271,6 +271,11 @@ void cpuset_unlock(void)
 	mutex_unlock(&cpuset_mutex);
 }
 
+void lockdep_assert_cpuset_lock_held(void)
+{
+	lockdep_assert_held(&cpuset_mutex);
+}
+
 /**
  * cpuset_full_lock - Acquire full protection for cpuset modification
  *

Original file line number	Diff line number	Diff line change
`@@ -271,6 +271,11 @@ void cpuset_unlock(void)`
`271`	`271`	`mutex_unlock(&cpuset_mutex);`
`272`	`272`	`}`
`273`	`273`
	`274`	`+void lockdep_assert_cpuset_lock_held(void)`
	`275`	`+{`
	`276`	`+ lockdep_assert_held(&cpuset_mutex);`
	`277`	`+}`
	`278`	`+`
`274`	`279`	`/**`
`275`	`280`	`* cpuset_full_lock - Acquire full protection for cpuset modification`
`276`	`281`	`*`