timevalsub
timevalsub(&t2, &clk, &prev_clk);
timevalsub(&now, &clk, &epoch);
timevalsub(&wtime, &ifinit_timer, &now);
timevalsub(&t2, &flush_kern_timer, &now);
timevalsub(&t2, &next_bcast, &now);
timevalsub(&t2, &no_flash, &now);
timevalsub(&t2, &age_timer, &now);
timevalsub(&t2, &need_kern, &now);
timevalsub(&t2, &rdisc_timer, &now);
static void timevalsub(struct timeval *, struct timeval *, struct timeval *);
timevalsub(&min_wait, &tv);