[linux-next:master 6618/6917] kernel/sched/psi.c:1230:13: sparse: error: incompatible types in comparison expression (different address spaces)

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   1bd831d68d5521c01d783af0275439ac645f5027
commit: e7acbba0d6f7a24c8d24280089030eb9a0eb7522 [6618/6917] psi: introduce psi monitor
reproduce:
        # apt-get install sparse
        git checkout e7acbba0d6f7a24c8d24280089030eb9a0eb7522
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

All errors (new ones prefixed by >>):

   kernel/sched/psi.c:151:6: sparse: warning: symbol 'psi_enable' was not declared. Should it be static?
>> kernel/sched/psi.c:1230:13: sparse: error: incompatible types in comparison expression (different address spaces)
   kernel/sched/psi.c:774:30: sparse: warning: dereference of noderef expression

vim +1230 kernel/sched/psi.c

  1222	
  1223	static __poll_t psi_fop_poll(struct file *file, poll_table *wait)
  1224	{
  1225		struct seq_file *seq = file->private_data;
  1226		struct psi_trigger *t;
  1227		__poll_t ret;
  1228	
  1229		rcu_read_lock();
> 1230		t = rcu_dereference(seq->private);
  1231		if (t)
  1232			ret = psi_trigger_poll(t, file, wait);
  1233		else
  1234			ret = DEFAULT_POLLMASK | EPOLLERR | EPOLLPRI;
  1235		rcu_read_unlock();
  1236	
  1237		return ret;
  1238	

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