static int __init xen_acpi_processor_init()

in xen-acpi-processor.c [519:581]

• 50 lines of code
• 8 McCabe index (conditional complexity)

static int __init xen_acpi_processor_init(void)
{
	int i;
	int rc;

	if (!xen_initial_domain())
		return -ENODEV;

	nr_acpi_bits = get_max_acpi_id() + 1;
	acpi_ids_done = bitmap_zalloc(nr_acpi_bits, GFP_KERNEL);
	if (!acpi_ids_done)
		return -ENOMEM;

	acpi_perf_data = alloc_percpu(struct acpi_processor_performance);
	if (!acpi_perf_data) {
		pr_debug("Memory allocation error for acpi_perf_data\n");
		bitmap_free(acpi_ids_done);
		return -ENOMEM;
	}
	for_each_possible_cpu(i) {
		if (!zalloc_cpumask_var_node(
			&per_cpu_ptr(acpi_perf_data, i)->shared_cpu_map,
			GFP_KERNEL, cpu_to_node(i))) {
			rc = -ENOMEM;
			goto err_out;
		}
	}

	/* Do initialization in ACPI core. It is OK to fail here. */
	(void)acpi_processor_preregister_performance(acpi_perf_data);

	for_each_possible_cpu(i) {
		struct acpi_processor *pr;
		struct acpi_processor_performance *perf;

		pr = per_cpu(processors, i);
		perf = per_cpu_ptr(acpi_perf_data, i);
		if (!pr)
			continue;

		pr->performance = perf;
		rc = acpi_processor_get_performance_info(pr);
		if (rc)
			goto err_out;
	}

	rc = xen_upload_processor_pm_data();
	if (rc)
		goto err_unregister;

	register_syscore_ops(&xap_syscore_ops);

	return 0;
err_unregister:
	for_each_possible_cpu(i)
		acpi_processor_unregister_performance(i);

err_out:
	/* Freeing a NULL pointer is OK: alloc_percpu zeroes. */
	free_acpi_perf_data();
	bitmap_free(acpi_ids_done);
	return rc;
}