[kkdwivedi:mlp 58/59] fs/eventpoll.c:2166:undefined reference to `sock_from_file'

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/kkdwivedi/linux mlp
head:   cb749145988a07c430f0cc8004d3d40b4227fe1f
commit: 54493c2a59093e36a0f02fec2073203cd83bfb10 [58/59] epoll: Prefetch the ready items' files, sockets and socks ahead of delivery
config: powerpc-randconfig-r2104-20261007 (https://download.01.org/0day-ci/archive/20261008/202610080055.22iqebug-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 13.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261008/202610080055.22iqebug-lkp@intel.com/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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610080055.22iqebug-lkp@intel.com/

All errors (new ones prefixed by >>):

   powerpc-linux-ld: fs/eventpoll.o: in function `ep_send_lookahead_step':
>> fs/eventpoll.c:2166:(.text+0xebc): undefined reference to `sock_from_file'


vim +2166 fs/eventpoll.c

  2141	
  2142	static void ep_send_lookahead_step(struct ep_send_lookahead *la,
  2143					   const struct list_head *head)
  2144	{
  2145		struct epitem *next;
  2146		struct sock *sk;
  2147	
  2148		if (la->sock) {
  2149			sk = READ_ONCE(la->sock->sk);
  2150			if (sk) {
  2151				/* what sock_poll and tcp_poll read: the state and
  2152				 * error, the receive queue and sequence numbers, the
  2153				 * wait queue, the send space
  2154				 */
  2155				prefetch(sk);
  2156				prefetch(&sk->__cacheline_group_begin__sock_write_rx);
  2157				prefetch(&sk->__cacheline_group_begin__sock_read_rx);
  2158				prefetch(&sk->__cacheline_group_begin__sock_write_rxtx);
  2159				prefetch(&sk->__cacheline_group_begin__sock_write_tx);
  2160				prefetch(&sk->__cacheline_group_begin__sock_read_tx);
  2161				prefetch(&tcp_sk(sk)->rcv_nxt);
  2162			}
  2163			la->sock = NULL;
  2164		}
  2165		if (la->file) {
> 2166			la->sock = sock_from_file(la->file);
  2167			if (la->sock)
  2168				prefetch(la->sock);
  2169			la->file = NULL;
  2170		}
  2171		if (la->item) {
  2172			la->file = la->item->ffd.file;
  2173			prefetch(la->file);
  2174			next = list_next_entry(la->item, rdllink);
  2175			la->item = &next->rdllink != head ? next : NULL;
  2176			if (la->item)
  2177				prefetch(la->item);
  2178		}
  2179	}
  2180	

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