22 struct kref {  struct
30 static inline void kref_init(struct kref *kref)  in kref_init()  argument
32 	atomic_set(&kref->refcount, 1);  in kref_init()
39 static inline void kref_get(struct kref *kref)  in kref_get()  argument
41 	WARN_ON(!atomic_read(&kref->refcount));  in kref_get()
42 	atomic_inc(&kref->refcount);  in kref_get()
63 static inline int kref_sub(struct kref *kref, unsigned int count,  in kref_sub()  argument
64 	     void (*release)(struct kref *kref))  in kref_sub()  argument
68 	if (atomic_sub_and_test((int) count, &kref->refcount)) {  in kref_sub()
69 		release(kref);  in kref_sub()
92 static inline int kref_put(struct kref *kref, void (*release)(struct kref *kref))  in kref_put()  argument
94 	return kref_sub(kref, 1, release);  in kref_put()
113 static inline int __must_check kref_get_unless_zero(struct kref *kref)  in kref_get_unless_zero()  argument
115 	return atomic_add_unless(&kref->refcount, 1, 0);  in kref_get_unless_zero()