int empty = bitmap_empty(nodes, MAX_NUMNODES);
int empty = nodes_empty(*nodes);
static int mpol_check_policy(int mode, unsigned long *nodes){	int empty = bitmap_empty(nodes, MAX_NUMNODES);	switch (mode) {	case MPOL_DEFAULT:		if (!empty)			return -EINVAL;		break;	case MPOL_BIND:	case MPOL_INTERLEAVE:		/* Preferred will only use the first bit, but allow		   more for now. */		if (empty)			return -EINVAL;		break;	}	return nodes_online(nodes);}