Index: sys/compat/linux/linux_futex.c
===================================================================
--- sys/compat/linux/linux_futex.c
+++ sys/compat/linux/linux_futex.c
@@ -994,12 +994,10 @@
 		return (EFAULT);
 	if ((uval & FUTEX_TID_MASK) == em->em_tid) {
 		mval = (uval & FUTEX_WAITERS) | FUTEX_OWNER_DIED;
-		nval = casuword32(uaddr, uval, mval);
-
-		if (nval == -1)
+		error = casueword32(uaddr, uval, &nval, mval);
+		if (error == -1)
 			return (EFAULT);
-
-		if (nval != uval)
+		if (error == 1)
 			goto retry;
 
 		if (!pi && (uval & FUTEX_WAITERS)) {