DIFF_RETURN
DIFF_RETURN(kb, ka, ki_pcpu);
DIFF_RETURN(kb, ka, ki_memsize);
DIFF_RETURN(ka, kb, ki_p->ki_tdev);
DIFF_RETURN(ka, kb, ki_p->ki_pid);
DIFF_RETURN(ka, kb, ki_p->ki_tid);
DIFF_RETURN(a, b, time_low);
DIFF_RETURN(a, b, time_mid);
DIFF_RETURN(a, b, time_hi_and_version);
DIFF_RETURN(a, b, clock_seq_hi_and_reserved);
DIFF_RETURN(a, b, clock_seq_low);