process.c

		ip = READ_ONCE_NOCHECK(*(unsigned long *)(fp + sizeof(unsigned long)));
		if (!in_sched_functions(ip)) {
			ret = ip;
			goto out;
		}
		fp = READ_ONCE_NOCHECK(*(unsigned long *)fp);
	} while (count++ < 16 && p->state != TASK_RUNNING);

out:
	put_task_stack(p);
	return ret;
}

long do_arch_prctl_common(struct task_struct *task, int option,
			  unsigned long cpuid_enabled)
{
	switch (option) {
	case ARCH_GET_CPUID:
		return get_cpuid_mode();
	case ARCH_SET_CPUID:
		return set_cpuid_mode(task, cpuid_enabled);
	}

	return -EINVAL;
}