Index: sys/vm/_vm_domain.h
===================================================================
--- sys/vm/_vm_domain.h	(revision 266197)
+++ sys/vm/_vm_domain.h	(working copy)
@@ -69,10 +69,14 @@ enum vm_domain_policy {
 struct vm_domain_select {
 	vm_domainset_t		ds_mask;	/* bitmask of valid domains. */
 	enum vm_domain_policy	ds_policy;	/* Allocation policy. */
-	int			ds_cursor;	/* Allocation cursor. */
+	union {
+		int		dsc_rr_idx;	/* Round-robin cursor. */
+	} ds_cursor;
 	int			ds_count;	/* Domains in policy. */
 };
 
+#define	ds_rr_idx	ds_cursor.dsc_rr_idx
+
 #endif /* _KERNEL */
 
 #endif /* !_VM__DOMAIN_H_ */
Index: sys/vm/vm_domain.h
===================================================================
--- sys/vm/vm_domain.h	(revision 266197)
+++ sys/vm/vm_domain.h	(working copy)
@@ -99,7 +99,7 @@ vm_domain_select_first(struct vm_domain_select *se
 			break;
 		/* FALLTHROUGH */
 	case ROUNDROBIN:
-		domain = atomic_fetchadd_int(&sel->ds_cursor, 1) % vm_ndomains;
+		domain = atomic_fetchadd_int(&sel->ds_rr_idx, 1) % vm_ndomains;
 		if (!VM_DOMAIN_ISSET(domain, &sel->ds_mask))
 			domain = vm_domain_select_next(sel, domain);
 	}