kernel: backport the dev_set_threaded export to 5.10

Fixes mt76 build error

Signed-off-by: Felix Fietkau <[email protected]>

target/linux/generic/backport-5.10/605-v5.12-net-export-dev_set_threaded-symbol.patch

@@ -0,0 +1,24 @@
+From: Lorenzo Bianconi <[email protected]>
+Date: Sun, 14 Mar 2021 15:49:19 +0100
+Subject: [PATCH] net: export dev_set_threaded symbol
+
+For wireless devices (e.g. mt76 driver) multiple net_devices belongs to
+the same wireless phy and the napi object is registered in a dummy
+netdevice related to the wireless phy.
+Export dev_set_threaded in order to be reused in device drivers enabling
+threaded NAPI.
+
+Signed-off-by: Lorenzo Bianconi <[email protected]>
+Signed-off-by: David S. Miller <[email protected]>
+---
+
+--- a/net/core/dev.c
++++ b/net/core/dev.c
+@@ -6819,6 +6819,7 @@ int dev_set_threaded(struct net_device *
+
+ 	return err;
+ }
++EXPORT_SYMBOL(dev_set_threaded);
+
+ void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
+ 		    int (*poll)(struct napi_struct *, int), int weight)