SYSCALL_DEFINE3(sched_setattr, pid_t, pid, struct sched_attr __user *, uattr,
			       unsigned int, flags)
{
	struct sched_attr attr;
	struct task_struct *p;
	int retval;

	if (!uattr || pid < 0 || flags)
		return -EINVAL;

	retval = sched_copy_attr(uattr, &attr);
	if (retval)
		return retval;

	if ((int)attr.sched_policy < 0)
		return -EINVAL;

	rcu_read_lock();
	retval = -ESRCH;
	p = find_process_by_pid(pid);
	if (p != NULL)
		retval = sched_setattr(p, &attr);
	rcu_read_unlock();

	return retval;
}
Unknown