bochs_drv.c:undefined reference to `remove_conflicting_framebuffers'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   65ea11ec6a82b1d44aba62b59e9eb20247e57c6e
commit: 0b6320dfdfea4c68602fa3b8a8d944bf9e442079 drm/virtio: make fbdev support really optional
date:   3 weeks ago
config: x86_64-randconfig-s4-08082227 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        git checkout 0b6320dfdfea4c68602fa3b8a8d944bf9e442079
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `bochs_pci_probe':
>> bochs_drv.c:(.text+0x1455d3): undefined reference to `remove_conflicting_framebuffers'

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Attachment: .config.gz
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