diff --git a/sys/amd64/amd64/mp_machdep.c b/sys/amd64/amd64/mp_machdep.c
index 5f4aacf9510a..3ad00e799b6e 100644
--- a/sys/amd64/amd64/mp_machdep.c
+++ b/sys/amd64/amd64/mp_machdep.c
@@ -1150,7 +1150,7 @@ smp_targeted_tlb_shootdown(cpuset_t mask, u_int vector, vm_offset_t addr1, vm_of
 		ipi_all_but_self(vector);
 	} else {
 		ncpu = 0;
-		while ((cpu = cpusetobj_ffs(&mask)) != 0) {
+		while ((cpu = CPU_FFS(&mask)) != 0) {
 			cpu--;
 			CPU_CLR(cpu, &mask);
 			CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__,
@@ -1299,7 +1299,7 @@ ipi_selected(cpuset_t cpus, u_int ipi)
 	if (ipi == IPI_STOP_HARD)
 		CPU_OR_ATOMIC(&ipi_nmi_pending, &cpus);
 
-	while ((cpu = cpusetobj_ffs(&cpus)) != 0) {
+	while ((cpu = CPU_FFS(&cpus)) != 0) {
 		cpu--;
 		CPU_CLR(cpu, &cpus);
 		CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu, ipi);
diff --git a/sys/i386/i386/mp_machdep.c b/sys/i386/i386/mp_machdep.c
index a7046d88a61d..9b832ed2d211 100644
--- a/sys/i386/i386/mp_machdep.c
+++ b/sys/i386/i386/mp_machdep.c
@@ -1249,7 +1249,7 @@ smp_targeted_tlb_shootdown(cpuset_t mask, u_int vector, vm_offset_t addr1, vm_of
 		ipi_all_but_self(vector);
 	} else {
 		ncpu = 0;
-		while ((cpu = cpusetobj_ffs(&mask)) != 0) {
+		while ((cpu = CPU_FFS(&mask)) != 0) {
 			cpu--;
 			CPU_CLR(cpu, &mask);
 			CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu,
@@ -1398,7 +1398,7 @@ ipi_selected(cpuset_t cpus, u_int ipi)
 	if (ipi == IPI_STOP_HARD)
 		CPU_OR_ATOMIC(&ipi_nmi_pending, &cpus);
 
-	while ((cpu = cpusetobj_ffs(&cpus)) != 0) {
+	while ((cpu = CPU_FFS(&cpus)) != 0) {
 		cpu--;
 		CPU_CLR(cpu, &cpus);
 		CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu, ipi);
diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c
index d889bf85a780..0338bb110766 100644
--- a/sys/i386/i386/pmap.c
+++ b/sys/i386/i386/pmap.c
@@ -1957,7 +1957,7 @@ pmap_lazyfix(pmap_t pmap)
 		spins = 50000000;
 
 		/* Find least significant set bit. */
-		lsb = cpusetobj_ffs(&mask);
+		lsb = CPU_FFS(&mask);
 		MPASS(lsb != 0);
 		lsb--;
 		CPU_SETOF(lsb, &mask);
diff --git a/sys/i386/xen/mp_machdep.c b/sys/i386/xen/mp_machdep.c
index 253cc40c5d7d..fdfa8124fd7e 100644
--- a/sys/i386/xen/mp_machdep.c
+++ b/sys/i386/xen/mp_machdep.c
@@ -1039,7 +1039,7 @@ smp_targeted_tlb_shootdown(cpuset_t mask, u_int vector, vm_offset_t addr1, vm_of
 		ipi_all_but_self(vector);
 	} else {
 		ncpu = 0;
-		while ((cpu = cpusetobj_ffs(&mask)) != 0) {
+		while ((cpu = CPU_FFS(&mask)) != 0) {
 			cpu--;
 			CPU_CLR(cpu, &mask);
 			CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu,
@@ -1132,7 +1132,7 @@ ipi_selected(cpuset_t cpus, u_int ipi)
 	if (ipi == IPI_STOP_HARD)
 		CPU_OR_ATOMIC(&ipi_nmi_pending, &cpus);
 
-	while ((cpu = cpusetobj_ffs(&cpus)) != 0) {
+	while ((cpu = CPU_FFS(&cpus)) != 0) {
 		cpu--;
 		CPU_CLR(cpu, &cpus);
 		CTR3(KTR_SMP, "%s: cpu: %d ipi: %x", __func__, cpu, ipi);
diff --git a/sys/i386/xen/pmap.c b/sys/i386/xen/pmap.c
index 01a493c2027b..96988e2c52f9 100644
--- a/sys/i386/xen/pmap.c
+++ b/sys/i386/xen/pmap.c
@@ -1707,7 +1707,7 @@ pmap_lazyfix(pmap_t pmap)
 		spins = 50000000;
 
 		/* Find least significant set bit. */
-		lsb = cpusetobj_ffs(&mask);
+		lsb = CPU_FFS(&mask);
 		MPASS(lsb != 0);
 		lsb--;
 		CPU_SETOF(lsb, &mask);
diff --git a/sys/kern/kern_cpuset.c b/sys/kern/kern_cpuset.c
index 2ef1fa733b97..507d059f673c 100644
--- a/sys/kern/kern_cpuset.c
+++ b/sys/kern/kern_cpuset.c
@@ -620,26 +620,6 @@ cpuset_setproc(pid_t pid, struct cpuset *set, cpuset_t *mask)
 	return (error);
 }
 
-/*
- * 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.
diff --git a/sys/mips/mips/mp_machdep.c b/sys/mips/mips/mp_machdep.c
index 229812439c0c..88c2357a1a35 100644
--- a/sys/mips/mips/mp_machdep.c
+++ b/sys/mips/mips/mp_machdep.c
@@ -208,7 +208,7 @@ cpu_mp_setmaxid(void)
 	platform_cpu_mask(&cpumask);
 	mp_ncpus = 0;
 	last = 1;
-	while ((cpu = cpusetobj_ffs(&cpumask)) != 0) {
+	while ((cpu = CPU_FFS(&cpumask)) != 0) {
 		last = cpu;
 		cpu--;
 		CPU_CLR(cpu, &cpumask);
@@ -251,7 +251,7 @@ cpu_mp_start(void)
 	platform_cpu_mask(&cpumask);
 
 	while (!CPU_EMPTY(&cpumask)) {
-		cpuid = cpusetobj_ffs(&cpumask) - 1;
+		cpuid = CPU_FFS(&cpumask) - 1;
 		CPU_CLR(cpuid, &cpumask);
 
 		if (cpuid >= MAXCPU) {
diff --git a/sys/sparc64/sparc64/mp_machdep.c b/sys/sparc64/sparc64/mp_machdep.c
index b03412e282d2..fccfb6f6ae68 100644
--- a/sys/sparc64/sparc64/mp_machdep.c
+++ b/sys/sparc64/sparc64/mp_machdep.c
@@ -557,7 +557,7 @@ spitfire_ipi_selected(cpuset_t cpus, u_long d0, u_long d1, u_long d2)
 {
 	u_int cpu;
 
-	while ((cpu = cpusetobj_ffs(&cpus)) != 0) {
+	while ((cpu = CPU_FFS(&cpus)) != 0) {
 		cpu--;
 		CPU_CLR(cpu, &cpus);
 		spitfire_ipi_single(cpu, d0, d1, d2);
diff --git a/sys/sys/bitset.h b/sys/sys/bitset.h
index c93cb2cdceaf..dee5542d68b7 100644
--- a/sys/sys/bitset.h
+++ b/sys/sys/bitset.h
@@ -150,4 +150,19 @@
 		    (f)->__bits[__i]);					\
 } while (0)
 
+#define	BIT_FFS(_s, p) __extension__ ({					\
+	__size_t __i;							\
+	int __bit;							\
+									\
+	__bit = 0;							\
+	for (__i = 0; __i < __bitset_words((_s)); __i++) {		\
+		if ((p)->__bits[__i] != 0) {				\
+			__bit = ffsl((p)->__bits[__i]);			\
+			__bit += __i * _BITSET_BITS;			\
+			break;						\
+		}							\
+	}								\
+	__bit;								\
+})
+
 #endif /* !_SYS_BITSET_H_ */
diff --git a/sys/sys/cpuset.h b/sys/sys/cpuset.h
index 259070b0f62f..511b87a799ec 100644
--- a/sys/sys/cpuset.h
+++ b/sys/sys/cpuset.h
@@ -57,6 +57,7 @@
 #define	CPU_SET_ATOMIC(n, p)		BIT_SET_ATOMIC(CPU_SETSIZE, n, p)
 #define	CPU_OR_ATOMIC(d, s)		BIT_OR_ATOMIC(CPU_SETSIZE, d, s)
 #define	CPU_COPY_STORE_REL(f, t)	BIT_COPY_STORE_REL(CPU_SETSIZE, f, t)
+#define	CPU_FFS(p)			BIT_FFS(CPU_SETSIZE, p)
 
 /*
  * Valid cpulevel_t values.
@@ -118,7 +119,6 @@ void	cpuset_rel(struct cpuset *);
 int	cpuset_setthread(lwpid_t id, cpuset_t *);
 int	cpuset_create_root(struct prison *, struct cpuset **);
 int	cpuset_setproc_update_set(struct proc *, struct cpuset *);
-int	cpusetobj_ffs(const cpuset_t *);
 char	*cpusetobj_strprint(char *, const cpuset_t *);
 int	cpusetobj_strscan(cpuset_t *, const char *);