void cfs_waitq_add(struct cfs_waitq *waitq, struct cfs_waitlink *link);
void cfs_waitq_add_exclusive(struct cfs_waitq *waitq,
struct cfs_waitlink *link);
-void cfs_waitq_forward(struct cfs_waitlink *link, struct cfs_waitq *waitq);
void cfs_waitq_del(struct cfs_waitq *waitq, struct cfs_waitlink *link);
int cfs_waitq_active(struct cfs_waitq *waitq);