[aaron:for_lkp_skl_2sp2_test 38/225] slab_common.c:undefined reference to `get_slabinfo'

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   aaron/for_lkp_skl_2sp2_test
head:   6c9381b65892222cbe2214fb22af9043f9ce1065
commit: b5bc190f7301227d5890b8fa8423e46e9ebee2c4 [38/225] mm: oom: show unreclaimable slab info when unreclaimable slabs > user memory
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.2.0-12) 7.2.1 20171025
reproduce:
        git checkout b5bc190f7301227d5890b8fa8423e46e9ebee2c4
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: the aaron/for_lkp_skl_2sp2_test HEAD 6c9381b65892222cbe2214fb22af9043f9ce1065 builds fine.
      It only hurts bisectibility.

All errors (new ones prefixed by >>):

   mm/slab_common.o: In function `dump_unreclaimable_slab':
>> slab_common.c:(.text+0x316): undefined reference to `get_slabinfo'

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