From: Chen Ridong Date: Thu, 18 Dec 2025 09:31:36 +0000 (+0000) Subject: cpuset: add lockdep_assert_cpuset_lock_held helper X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=14c11e1b2ac47fbc51503c7d0f35fad9ea5ea46e;p=thirdparty%2Fkernel%2Flinux.git cpuset: add lockdep_assert_cpuset_lock_held helper Add lockdep_assert_cpuset_lock_held() to allow other subsystems to verify that cpuset_mutex is held. Suggested-by: Waiman Long Signed-off-by: Chen Ridong Reviewed-by: Waiman Long Signed-off-by: Tejun Heo --- diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h index a98d3330385c2..a634489c9f123 100644 --- 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 index fea577b4016ad..4fa3080da3bee 100644 --- 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 *