Commit 14c11e1b authored by Chen Ridong's avatar Chen Ridong Committed by Tejun Heo
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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: default avatarWaiman Long <longman@redhat.com>
Signed-off-by: default avatarChen Ridong <chenridong@huawei.com>
Reviewed-by: default avatarWaiman Long <longman@redhat.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 6ee43047

include/linux/cpuset.h

+2 −0
Original line number Diff line number Diff line
@@ -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)

kernel/cgroup/cpuset.c

+5 −0
Original line number Diff line number Diff line
@@ -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

 *