undefined reference to `do_map_probe'

[kbuild test robot <fengguang.wu@intel.com>]

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Hi Hans,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   2850713576e81e3b887cd92a9965fba0dd1717c0
commit: 85756a069c55e0315ac5990806899cfb607b987f [media] cobalt: add new driver
date:   9 months ago
config: x86_64-randconfig-b0-02190622 (attached as .config)
reproduce:
        git checkout 85756a069c55e0315ac5990806899cfb607b987f
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `cobalt_flash_probe':
>> (.text+0x201342): undefined reference to `do_map_probe'
   drivers/built-in.o: In function `cobalt_flash_probe':
>> (.text+0x201393): undefined reference to `mtd_device_parse_register'
   drivers/built-in.o: In function `cobalt_flash_remove':
>> (.text+0x2013ba): undefined reference to `mtd_device_unregister'
   drivers/built-in.o: In function `cobalt_flash_remove':
>> (.text+0x2013c6): undefined reference to `map_destroy'

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