[kkdwivedi:mlp 59/59] fs/eventpoll.c:2218:16: error: 'ep_lookahead' undeclared; did you mean 'ep_send_lookahead'?

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

tree:   https://github.com/kkdwivedi/linux mlp
head:   cb749145988a07c430f0cc8004d3d40b4227fe1f
commit: cb749145988a07c430f0cc8004d3d40b4227fe1f [59/59] net, epoll: Make the receive and delivery look-aheads switchable
config: s390-randconfig-2000-20261007 (https://download.01.org/0day-ci/archive/20261007/202610072234.3UFRGNgM-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 8.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261007/202610072234.3UFRGNgM-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/202610072234.3UFRGNgM-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from <command-line>:
   fs/eventpoll.c: In function 'ep_send_events':
>> fs/eventpoll.c:2218:16: error: 'ep_lookahead' undeclared (first use in this function); did you mean 'ep_send_lookahead'?
     if (READ_ONCE(ep_lookahead) && !list_empty(&scan_batch)) {
                   ^~~~~~~~~~~~
   include/linux/compiler_types.h:682:9: note: in definition of macro '__compiletime_assert'
      if (!(condition))     \
            ^~~~~~~~~
   include/linux/compiler_types.h:702:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
     ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:2: note: in expansion of macro 'compiletime_assert'
     compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
     ^~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:21: note: in expansion of macro '__native_word'
     compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
                        ^~~~~~~~~~~~~
   include/asm-generic/rwonce.h:49:2: note: in expansion of macro 'compiletime_assert_rwonce_type'
     compiletime_assert_rwonce_type(x);    \
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   fs/eventpoll.c:2218:6: note: in expansion of macro 'READ_ONCE'
     if (READ_ONCE(ep_lookahead) && !list_empty(&scan_batch)) {
         ^~~~~~~~~
   fs/eventpoll.c:2218:16: note: each undeclared identifier is reported only once for each function it appears in
     if (READ_ONCE(ep_lookahead) && !list_empty(&scan_batch)) {
                   ^~~~~~~~~~~~
   include/linux/compiler_types.h:682:9: note: in definition of macro '__compiletime_assert'
      if (!(condition))     \
            ^~~~~~~~~
   include/linux/compiler_types.h:702:2: note: in expansion of macro '_compiletime_assert'
     _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
     ^~~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:2: note: in expansion of macro 'compiletime_assert'
     compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
     ^~~~~~~~~~~~~~~~~~
   include/asm-generic/rwonce.h:36:21: note: in expansion of macro '__native_word'
     compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
                        ^~~~~~~~~~~~~
   include/asm-generic/rwonce.h:49:2: note: in expansion of macro 'compiletime_assert_rwonce_type'
     compiletime_assert_rwonce_type(x);    \
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   fs/eventpoll.c:2218:6: note: in expansion of macro 'READ_ONCE'
     if (READ_ONCE(ep_lookahead) && !list_empty(&scan_batch)) {
         ^~~~~~~~~


vim +2218 fs/eventpoll.c

  2191	
  2192	static int ep_send_events(struct eventpoll *ep,
  2193				  struct epoll_event __user *events, int maxevents)
  2194	{
  2195		struct ep_send_lookahead la = {};
  2196		struct epitem *epi, *tmp;
  2197		LIST_HEAD(scan_batch);
  2198		poll_table pt;
  2199		int res = 0;
  2200	
  2201		/*
  2202		 * Always short-circuit for fatal signals to allow threads to make a
  2203		 * timely exit without the chance of finding more events available and
  2204		 * fetching repeatedly.
  2205		 */
  2206		if (fatal_signal_pending(current))
  2207			return -EINTR;
  2208	
  2209		init_poll_funcptr(&pt, NULL);
  2210	
  2211		mutex_lock(&ep->mtx);
  2212		ep_start_scan(ep, &scan_batch);
  2213	
  2214		/*
  2215		 * We can loop without lock because we are passed a task-private
  2216		 * scan_batch; items cannot vanish while we hold ep->mtx.
  2217		 */
> 2218		if (READ_ONCE(ep_lookahead) && !list_empty(&scan_batch)) {
  2219			la.item = list_first_entry(&scan_batch, struct epitem, rdllink);
  2220			ep_send_lookahead_step(&la, &scan_batch);
  2221			ep_send_lookahead_step(&la, &scan_batch);
  2222			ep_send_lookahead_step(&la, &scan_batch);
  2223		}
  2224	
  2225		list_for_each_entry_safe(epi, tmp, &scan_batch, rdllink) {
  2226			int delivered;
  2227	
  2228			if (res >= maxevents)
  2229				break;
  2230	
  2231			if (la.item || la.file || la.sock)
  2232				ep_send_lookahead_step(&la, &scan_batch);
  2233			delivered = ep_deliver_event(ep, epi, &pt, &events, &scan_batch);
  2234			if (delivered < 0) {
  2235				if (!res)
  2236					res = delivered;
  2237				break;
  2238			}
  2239			res += delivered;
  2240		}
  2241	
  2242		ep_done_scan(ep, &scan_batch);
  2243		mutex_unlock(&ep->mtx);
  2244	
  2245		return res;
  2246	}
  2247	

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