--- x/include/linux/netdevice.h
+++ y/include/linux/netdevice.h
@@ -4402,7 +4402,7 @@ static inline void __netif_tx_lock(struc
 {
 	spin_lock(&txq->_xmit_lock);
 	/* Pairs with READ_ONCE() in __dev_queue_xmit() */
-	WRITE_ONCE(txq->xmit_lock_owner, cpu);
+	WRITE_ONCE(txq->xmit_lock_owner, smp_processor_id());
 }
 
 static inline bool __netif_tx_acquire(struct netdev_queue *txq)