int __cpu_up()

in kernel/smp.c [94:114]

• 18 lines of code
• 3 McCabe index (conditional complexity)

int __cpu_up(unsigned int cpu, struct task_struct *idle)
{
	if (smp_cross_call == NULL) {
		pr_warn("CPU%u: failed to start, IPI controller missing",
			cpu);
		return -EIO;
	}

	secondary_thread_info = task_thread_info(idle);
	current_pgd[cpu] = init_mm.pgd;

	boot_secondary(cpu, idle);
	if (!wait_for_completion_timeout(&cpu_running,
					msecs_to_jiffies(1000))) {
		pr_crit("CPU%u: failed to start\n", cpu);
		return -EIO;
	}
	synchronise_count_master(cpu);

	return 0;
}