net: busy-poll: remove LL_FLUSH_FAILED and LL_FLUSH_BUSY

Commit 79e7fff4 ("net: remove support for per driver
ndo_busy_poll()") made them obsolete.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/busy_poll.h

@@ -33,10 +33,6 @@ struct napi_struct;
 extern unsigned int sysctl_net_busy_read __read_mostly;
 extern unsigned int sysctl_net_busy_poll __read_mostly;
 
-/* return values from ndo_ll_poll */
-#define LL_FLUSH_FAILED		-1
-#define LL_FLUSH_BUSY		-2
-
 static inline bool net_busy_loop_on(void)
 {
 	return sysctl_net_busy_poll;

net/core/dev.c

@@ -5008,9 +5008,6 @@ bool sk_busy_loop(struct sock *sk, int nonblock)
 					LINUX_MIB_BUSYPOLLRXPACKETS, rc);
 		local_bh_enable();
 
-		if (rc == LL_FLUSH_FAILED)
-			break; /* permanent failure */
-
 		if (nonblock || !skb_queue_empty(&sk->sk_receive_queue) ||
 		    busy_loop_timeout(end_time))
 			break;