net: napi_hash_add() is no longer exported

There are no more users except from net/core/dev.c
napi_hash_add() can now be static.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netdevice.h

@@ -467,17 +467,6 @@ static inline void napi_complete(struct napi_struct *n)
 	return napi_complete_done(n, 0);
 }
 
-/**
- *	napi_hash_add - add a NAPI to global hashtable
- *	@napi: NAPI context
- *
- * Generate a new napi_id and store a @napi under it in napi_hash.
- * Used for busy polling (CONFIG_NET_RX_BUSY_POLL).
- * Note: This is normally automatically done from netif_napi_add(),
- * so might disappear in a future Linux version.
- */
-void napi_hash_add(struct napi_struct *napi);
-
 /**
  *	napi_hash_del - remove a NAPI from global table
  *	@napi: NAPI context

net/core/dev.c

@@ -5017,7 +5017,7 @@ EXPORT_SYMBOL(sk_busy_loop);
 
 #endif /* CONFIG_NET_RX_BUSY_POLL */
 
-void napi_hash_add(struct napi_struct *napi)
+static void napi_hash_add(struct napi_struct *napi)
 {
 	if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state) ||
 	    test_and_set_bit(NAPI_STATE_HASHED, &napi->state))
@@ -5037,7 +5037,6 @@ void napi_hash_add(struct napi_struct *napi)
 
 	spin_unlock(&napi_hash_lock);
 }
-EXPORT_SYMBOL_GPL(napi_hash_add);
 
 /* Warning : caller is responsible to make sure rcu grace period
  * is respected before freeing memory containing @napi