callout_heap_process
(void) callout_heap_process(ct, 0, 0);
hexp = callout_heap_process(ct, delta, timechange);
hexp = callout_heap_process(ct, 0, 1);
(void) callout_heap_process(ct, 0, 0);
(void) callout_heap_process(ct, 0, 0);
static hrtime_t callout_heap_process(callout_table_t *, hrtime_t, int);