void secondary_start_kernel()

in kernel/smp.c [118:164]

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

void secondary_start_kernel(void)
{
	struct mm_struct *mm = &init_mm;
	unsigned int cpu = smp_processor_id();

	init_mmu();

#ifdef CONFIG_DEBUG_MISC
	if (boot_secondary_processors == 0) {
		pr_debug("%s: boot_secondary_processors:%d; Hanging cpu:%d\n",
			__func__, boot_secondary_processors, cpu);
		for (;;)
			__asm__ __volatile__ ("waiti " __stringify(LOCKLEVEL));
	}

	pr_debug("%s: boot_secondary_processors:%d; Booting cpu:%d\n",
		__func__, boot_secondary_processors, cpu);
#endif
	/* Init EXCSAVE1 */

	secondary_trap_init();

	/* All kernel threads share the same mm context. */

	mmget(mm);
	mmgrab(mm);
	current->active_mm = mm;
	cpumask_set_cpu(cpu, mm_cpumask(mm));
	enter_lazy_tlb(mm, current);

	trace_hardirqs_off();

	calibrate_delay();

	notify_cpu_starting(cpu);

	secondary_init_irq();
	local_timer_setup(cpu);

	set_cpu_online(cpu, true);

	local_irq_enable();

	complete(&cpu_running);

	cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}