undefined reference to `remove_conflicting_framebuffers'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   29b4817d4018df78086157ea3a55c1d9424a7cfc
commit: 0b6320dfdfea4c68602fa3b8a8d944bf9e442079 drm/virtio: make fbdev support really optional
date:   3 weeks ago
config: i386-randconfig-sb0-08081508 (attached as .config)
compiler: gcc-5 (Debian 5.4.0-6) 5.4.0 20160609
reproduce:
        git checkout 0b6320dfdfea4c68602fa3b8a8d944bf9e442079
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `drm_virtio_init':
>> (.text+0x1becab): undefined reference to `remove_conflicting_framebuffers'

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