ccount_timer
static DEFINE_PER_CPU(struct ccount_timer, ccount_timer) = {
struct clock_event_device *evt = &this_cpu_ptr(&ccount_timer)->evt;
struct ccount_timer *timer = &per_cpu(ccount_timer, cpu);
irq = this_cpu_ptr(&ccount_timer)->evt.irq;
struct ccount_timer *timer =
container_of(evt, struct ccount_timer, evt);
struct ccount_timer *timer =
container_of(evt, struct ccount_timer, evt);