Index: sys/kern/kern_cpuset.c
===================================================================
--- sys/kern/kern_cpuset.c	(revision 221870)
+++ sys/kern/kern_cpuset.c	(working copy)
@@ -617,6 +617,49 @@
 }
 
 /*
+ * Calculate the ffs() of the cpuset.
+ */
+int
+cpusetobj_ffs(const cpuset_t *set)
+{
+	size_t i;
+	int cbit;
+
+	cbit = 0;
+	for (i = 0; i < _NCPUWORDS; i++) {
+		if (set->__bits[i] != 0) {
+			cbit = ffsl(set->__bits[i]);
+			cbit += i * _NCPUBITS;
+			break;
+		}
+	}
+	return (cbit);
+}
+
+/*
+ * Return a string representing a valid layout for a cpuset_t object.
+ * It expects an incoming buffer at least sized as CPUSETBUFSIZ.
+ */
+char *
+cpusetobj_strprint(char *buf, const cpuset_t *set)
+{
+	char *tbuf;
+	size_t i, bytesp, bufsiz;
+
+	tbuf = buf;
+	bytesp = 0;
+	bufsiz = CPUSETBUFSIZ;
+
+	for (i = 0; i < (_NCPUWORDS - 1); i++) {
+		bytesp = snprintf(tbuf, bufsiz, "%lx, ", set->__bits[i]);
+		bufsiz -= bytesp;
+		tbuf += bytesp;
+	}
+	snprintf(tbuf, bufsiz, "%lx", set->__bits[_NCPUWORDS - 1]);
+	return (buf);
+}
+
+/*
  * Apply an anonymous mask to a single thread.
  */
 int
@@ -676,7 +719,7 @@
 	 * cpuset_create() due to NULL parent.
 	 */
 	set = uma_zalloc(cpuset_zone, M_WAITOK | M_ZERO);
-	set->cs_mask.__bits[0] = -1;
+	CPU_FILL(&set->cs_mask);
 	LIST_INIT(&set->cs_children);
 	LIST_INSERT_HEAD(&cpuset_ids, set, cs_link);
 	set->cs_ref = 1;
@@ -754,12 +797,7 @@
 {
 	cpuset_t mask;
 
-	CPU_ZERO(&mask);
-#ifdef SMP
-	mask.__bits[0] = all_cpus;
-#else
-	mask.__bits[0] = 1;
-#endif
+	mask = all_cpus;
 	if (cpuset_modify(cpuset_zero, &mask))
 		panic("Can't set initial cpuset mask.\n");
 	cpuset_zero->cs_flags |= CPU_SET_RDONLY;