Index: sys/kern/subr_pctrie.c
===================================================================
--- sys/kern/subr_pctrie.c
+++ sys/kern/subr_pctrie.c
@@ -163,11 +163,7 @@
 	uint64_t ret;
 
 	ret = index;
-	if (level > 0) {
-		ret >>= level * PCTRIE_WIDTH;
-		ret <<= level * PCTRIE_WIDTH;
-	}
-	return (ret);
+	return (ret & -PCTRIE_UNITLEVEL(level));
 }
 
 /*
Index: sys/vm/vm_radix.c
===================================================================
--- sys/vm/vm_radix.c
+++ sys/vm/vm_radix.c
@@ -188,11 +188,7 @@
 	vm_pindex_t ret;
 
 	ret = index;
-	if (level > 0) {
-		ret >>= level * VM_RADIX_WIDTH;
-		ret <<= level * VM_RADIX_WIDTH;
-	}
-	return (ret);
+	return (ret & -VM_RADIX_UNITLEVEL(level));
 }
 
 /*