--- zzzz-none-000/linux-3.10.107/include/linux/etherdevice.h	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/include/linux/etherdevice.h	2021-11-10 11:53:56.000000000 +0000
@@ -198,8 +198,33 @@
 	eth_random_addr(dev->dev_addr);
 }
 
+/* AVM: backported from 3.15,
+ *
+ * commit 286ab723d4b83d37deb4017008ef1444a95cfb0d etherdevice: Use ether_addr_copy to copy an Ethernet address
+ */
 /**
- * compare_ether_addr - Compare two Ethernet addresses
+ * ether_addr_copy - Copy an Ethernet address
+ * @dst: Pointer to a six-byte array Ethernet address destination
+ * @src: Pointer to a six-byte array Ethernet address source
+ *
+ * Please note: dst & src must both be aligned to u16.
+ */
+static inline void ether_addr_copy(u8 *dst, const u8 *src)
+{
+#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
+       *(u32 *)dst = *(const u32 *)src;
+       *(u16 *)(dst + 4) = *(const u16 *)(src + 4);
+#else
+       u16 *a = (u16 *)dst;
+       const u16 *b = (const u16 *)src;
+
+       a[0] = b[0];
+       a[1] = b[1];
+       a[2] = b[2];
+#endif
+}
+
+/** * compare_ether_addr - Compare two Ethernet addresses
  * @addr1: Pointer to a six-byte array containing the Ethernet address
  * @addr2: Pointer other six-byte array containing the Ethernet address
  *