kernel/sched/psi.c:1479:17: error: implicit declaration of function 'kernfs_generic_poll'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   5d0c230f1de8c7515b6567d9afba1f196fb4e2f4
commit: aff037078ecaecf34a7c2afab1341815f90fba5e sched/psi: use kernfs polling functions for PSI trigger polling
date:   3 weeks ago
config: nios2-randconfig-r011-20230731 (https://download.01.org/0day-ci/archive/20230731/202307310732.r65EQFY0-lkp@xxxxxxxxx/config)
compiler: nios2-linux-gcc (GCC) 12.3.0
reproduce: (https://download.01.org/0day-ci/archive/20230731/202307310732.r65EQFY0-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202307310732.r65EQFY0-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

   In file included from kernel/sched/build_utility.c:97:
   kernel/sched/psi.c: In function 'psi_trigger_poll':
>> kernel/sched/psi.c:1479:17: error: implicit declaration of function 'kernfs_generic_poll' [-Werror=implicit-function-declaration]
    1479 |                 kernfs_generic_poll(t->of, wait);
         |                 ^~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors


vim +/kernfs_generic_poll +1479 kernel/sched/psi.c

  1464	
  1465	__poll_t psi_trigger_poll(void **trigger_ptr,
  1466					struct file *file, poll_table *wait)
  1467	{
  1468		__poll_t ret = DEFAULT_POLLMASK;
  1469		struct psi_trigger *t;
  1470	
  1471		if (static_branch_likely(&psi_disabled))
  1472			return DEFAULT_POLLMASK | EPOLLERR | EPOLLPRI;
  1473	
  1474		t = smp_load_acquire(trigger_ptr);
  1475		if (!t)
  1476			return DEFAULT_POLLMASK | EPOLLERR | EPOLLPRI;
  1477	
  1478		if (t->of)
> 1479			kernfs_generic_poll(t->of, wait);
  1480		else
  1481			poll_wait(file, &t->event_wait, wait);
  1482	
  1483		if (cmpxchg(&t->event, 1, 0) == 1)
  1484			ret |= EPOLLPRI;
  1485	
  1486		return ret;
  1487	}
  1488	

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