24 struct kref {  struct
32 static inline void kref_init(struct kref *kref)  in kref_init()  argument
34 	atomic_set(&kref->refcount, 1);  in kref_init()
41 static inline void kref_get(struct kref *kref)  in kref_get()  argument
47 	WARN_ON_ONCE(atomic_inc_return(&kref->refcount) < 2);  in kref_get()
68 static inline int kref_sub(struct kref *kref, unsigned int count,  in kref_sub()  argument
69 	     void (*release)(struct kref *kref))  in kref_sub()  argument
73 	if (atomic_sub_and_test((int) count, &kref->refcount)) {  in kref_sub()
74 		release(kref);  in kref_sub()
97 static inline int kref_put(struct kref *kref, void (*release)(struct kref *kref))  in kref_put()  argument
99 	return kref_sub(kref, 1, release);  in kref_put()
115 static inline int kref_put_spinlock_irqsave(struct kref *kref,  in kref_put_spinlock_irqsave()  argument
116 		void (*release)(struct kref *kref),  in kref_put_spinlock_irqsave()  argument
122 	if (atomic_add_unless(&kref->refcount, -1, 1))  in kref_put_spinlock_irqsave()
125 	if (atomic_dec_and_test(&kref->refcount)) {  in kref_put_spinlock_irqsave()
126 		release(kref);  in kref_put_spinlock_irqsave()
134 static inline int kref_put_mutex(struct kref *kref,  in kref_put_mutex()  argument
135 				 void (*release)(struct kref *kref),  in kref_put_mutex()  argument
139 	if (unlikely(!atomic_add_unless(&kref->refcount, -1, 1))) {  in kref_put_mutex()
141 		if (unlikely(!atomic_dec_and_test(&kref->refcount))) {  in kref_put_mutex()
145 		release(kref);  in kref_put_mutex()
167 static inline int __must_check kref_get_unless_zero(struct kref *kref)  in kref_get_unless_zero()  argument
169 	return atomic_add_unless(&kref->refcount, 1, 0);  in kref_get_unless_zero()