net/mptcp/options.c:1207:39: warning: implicit conversion from 'enum <anonymous>' to 'enum linux_mptcp_mib_field'

tree:   https://github.com/intel-lab-lkp/linux/commits/Matthieu-Baerts-NGI0/Squash-to-mptcp-explicitly-drop-over-memory-limits/20260731-182110
head:   85f8043c37254556a09478e4f26c2012a1c92fc6
commit: 79d68403b0c660279617aeb43ee4265c72640fd3 Squash to "mptcp: explicitly drop over memory limits"
date:   8 hours ago
config: s390-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20260731/[email protected]/config)
compiler: s390x-linux-gnu-gcc (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260731/[email protected]/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All warnings (new ones prefixed by >>):

   net/mptcp/options.c: In function 'mptcp_over_limit':
>> net/mptcp/options.c:1207:39: warning: implicit conversion from 'enum <anonymous>' to 'enum linux_mptcp_mib_field' [-Wenum-conversion]
    1207 |         MPTCP_INC_STATS(sock_net(sk), LINUX_MIB_TCPRCVQDROP);
         |                                       ^~~~~~~~~~~~~~~~~~~~~


vim +1207 net/mptcp/options.c

  1185	
  1186	static bool mptcp_over_limit(struct sock *sk, struct sock *ssk,
  1187				     const struct sk_buff *skb)
  1188	{
  1189		struct mptcp_sock *msk = mptcp_sk(sk);
  1190		u64 mem = sk_rmem_alloc_get(sk);
  1191	
  1192		mem += READ_ONCE(msk->backlog_len);
  1193		if (likely(mem <= READ_ONCE(sk->sk_rcvbuf)))
  1194			return false;
  1195	
  1196		/* Avoid silently dropping pure acks, fin or already-acked segments. */
  1197		if (TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq ||
  1198		    TCP_SKB_CB(skb)->tcp_flags & TCPHDR_FIN ||
  1199		    !after(TCP_SKB_CB(skb)->end_seq, tcp_sk(ssk)->rcv_nxt))
  1200			return false;
  1201	
  1202		/* Dropped due to memory constraints, schedule an ack. */
  1203		inet_csk(ssk)->icsk_ack.pending |= ICSK_ACK_NOMEM | ICSK_ACK_NOW;
  1204		inet_csk_schedule_ack(ssk);
  1205	
  1206		/* In fallback mode: skb is dropped before the TCP recv queue. */
> 1207		MPTCP_INC_STATS(sock_net(sk), LINUX_MIB_TCPRCVQDROP);
  1208	
  1209		return true;
  1210	}
  1211	

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