Symbol: zrl_is_zero
usr/src/uts/common/fs/zfs/sys/dbuf.h
377
#define DB_DNODE_HELD(_db) (!zrl_is_zero(&DB_DNODE_LOCK(_db)))
usr/src/uts/common/fs/zfs/sys/zrlock.h
53
extern int zrl_is_zero(zrlock_t *);