up(&cpuset_sem);
cpuset_up(&cpuset_sem);
void cpuset_update_current_mems_allowed(void){	struct cpuset *cs = current->cpuset;	if (!cs)		return;		/* task is exiting */	if (current->cpuset_mems_generation != cs->mems_generation) {		down(&cpuset_sem);		refresh_mems();		up(&cpuset_sem);	}}