kref: Add context-analysis annotations

Mark functions that conditionally acquire the passed lock.

Signed-off-by: Marco Elver <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Link: https://patch.msgid.link/[email protected]

include/linux/kref.h

@@ -81,6 +81,7 @@ static inline int kref_put(struct kref *kref, void (*release)(struct kref *kref)
 static inline int kref_put_mutex(struct kref *kref,
 				 void (*release)(struct kref *kref),
 				 struct mutex *mutex)
+	__cond_acquires(true, mutex)
 {
 	if (refcount_dec_and_mutex_lock(&kref->refcount, mutex)) {
 		release(kref);
@@ -102,6 +103,7 @@ static inline int kref_put_mutex(struct kref *kref,
 static inline int kref_put_lock(struct kref *kref,
 				void (*release)(struct kref *kref),
 				spinlock_t *lock)
+	__cond_acquires(true, lock)
 {
 	if (refcount_dec_and_lock(&kref->refcount, lock)) {
 		release(kref);