timer_cb1
bpf_timer_set_callback(lru_timer, timer_cb1);
bpf_timer_set_callback(arr_timer, timer_cb1);
bpf_timer_set_callback(timer, timer_cb1);
static int timer_cb1(void *map, int *key, struct hmap_elem *val);
bpf_timer_set_callback(&val->timer, timer_cb1);
if (bpf_timer_set_callback(&val->timer, timer_cb1))
bpf_timer_set_callback(arr_timer, timer_cb1);