获取x86的最大关中断时长

uint32_t max_intr_latency(void) {
    uint32_t max_int_lat = 0;
    for (struct cpu *cpu = cpus; cpu < cpus + ncpu; cpu++) {
        if (cpu->int_latency > max_int_lat) {
            max_int_lat = cpu->int_latency;
        }
    }
    return max_int_lat;
}