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cpuset: add lockdep_assert_cpuset_lock_held helper

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Add lockdep_assert_cpuset_lock_held() to allow other subsystems to verify
that cpuset_mutex is held.

Suggested-by: Waiman Long <longman@redhat.com>
Signed-off-by: Chen Ridong <chenridong@huawei.com>
Reviewed-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Chen Ridong 2025-12-18 09:31:36 +00:00 committed by Tejun Heo
parent 6ee43047e8
commit 14c11e1b2a
2 changed files with 7 additions and 0 deletions
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2
include/linux/cpuset.h
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@ -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)

5
kernel/cgroup/cpuset.c
View File

@ -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
*