releasesleep      122 kernel/bio.c     releasesleep(&b->lock);
releasesleep      120 kernel/defs.h  void            releasesleep(struct sleeplock*);
releasesleep      328 kernel/fs.c      releasesleep(&ip->lock);
releasesleep      368 kernel/fs.c        releasesleep(&ip->lock);
releasesleep       95 kernel/uart.c    releasesleep(&tx_lock);