static int boot_secondary()

in kernel/smp.c [191:230]

• 30 lines of code
• 6 McCabe index (conditional complexity)

static int boot_secondary(unsigned int cpu, struct task_struct *ts)
{
	unsigned long timeout = jiffies + msecs_to_jiffies(1000);
	unsigned long ccount;
	int i;

#ifdef CONFIG_HOTPLUG_CPU
	WRITE_ONCE(cpu_start_id, cpu);
	/* Pairs with the third memw in the cpu_restart */
	mb();
	system_flush_invalidate_dcache_range((unsigned long)&cpu_start_id,
					     sizeof(cpu_start_id));
#endif
	smp_call_function_single(0, mx_cpu_start, (void *)cpu, 1);

	for (i = 0; i < 2; ++i) {
		do
			ccount = get_ccount();
		while (!ccount);

		WRITE_ONCE(cpu_start_ccount, ccount);

		do {
			/*
			 * Pairs with the first two memws in the
			 * .Lboot_secondary.
			 */
			mb();
			ccount = READ_ONCE(cpu_start_ccount);
		} while (ccount && time_before(jiffies, timeout));

		if (ccount) {
			smp_call_function_single(0, mx_cpu_stop,
						 (void *)cpu, 1);
			WRITE_ONCE(cpu_start_ccount, 0);
			return -EIO;
		}
	}
	return 0;
}