[mmotm:master 124/394] mm/vmscan.c:410:15: error: 'shrinker_idr' undeclared; did you mean 'shrinker_list'?

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

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tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   b1da01df1aa700864692a49a7007fc96cc1da7d9
commit: f9ee2a2d698cd64d8032d56649e960a91bb98416 [124/394] mm: use special value SHRINKER_REGISTERING instead list_empty() check
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        git checkout f9ee2a2d698cd64d8032d56649e960a91bb98416
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: the mmotm/master HEAD b1da01df1aa700864692a49a7007fc96cc1da7d9 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   mm/vmscan.c: In function 'register_shrinker_prepared':
>> mm/vmscan.c:410:15: error: 'shrinker_idr' undeclared (first use in this function); did you mean 'shrinker_list'?
     idr_replace(&shrinker_idr, shrinker, shrinker->id);
                  ^~~~~~~~~~~~
                  shrinker_list
   mm/vmscan.c:410:15: note: each undeclared identifier is reported only once for each function it appears in
>> mm/vmscan.c:410:47: error: 'struct shrinker' has no member named 'id'
     idr_replace(&shrinker_idr, shrinker, shrinker->id);
                                                  ^~

vim +410 mm/vmscan.c

   405	
   406	void register_shrinker_prepared(struct shrinker *shrinker)
   407	{
   408		down_write(&shrinker_rwsem);
   409		list_add_tail(&shrinker->list, &shrinker_list);
 > 410		idr_replace(&shrinker_idr, shrinker, shrinker->id);
   411		up_write(&shrinker_rwsem);
   412	}
   413	

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