static int __init haltpoll_init()

in cpuidle-haltpoll.c [102:136]

• 27 lines of code
• 7 McCabe index (conditional complexity)

static int __init haltpoll_init(void)
{
	int ret;
	struct cpuidle_driver *drv = &haltpoll_driver;

	/* Do not load haltpoll if idle= is passed */
	if (boot_option_idle_override != IDLE_NO_OVERRIDE)
		return -ENODEV;

	cpuidle_poll_state_init(drv);

	if (!kvm_para_available() || !haltpoll_want())
		return -ENODEV;

	ret = cpuidle_register_driver(drv);
	if (ret < 0)
		return ret;

	haltpoll_cpuidle_devices = alloc_percpu(struct cpuidle_device);
	if (haltpoll_cpuidle_devices == NULL) {
		cpuidle_unregister_driver(drv);
		return -ENOMEM;
	}

	ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "cpuidle/haltpoll:online",
				haltpoll_cpu_online, haltpoll_cpu_offline);
	if (ret < 0) {
		haltpoll_uninit();
	} else {
		haltpoll_hp_state = ret;
		ret = 0;
	}

	return ret;
}