void as_set_checker(unsigned off, 
                    const struct callout_rtn *rtn);

Set the checker callout field of the indicated asinfo entry. If the AS_ATTR_CONTINUED bit is on in the entry, advance to the next entry in the section and set its priority as well (see as_add_containing() for why AS_ATTR_CONTINUED would be on). Repeat until an entry without AS_ATTR_CONTINUED is found.