ERROR: "gen_pool_virt_to_phys" [drivers/staging/vboxvideo/vboxvideo.ko] undefined!

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   520eccdfe187591a51ea9ab4c1a024ae4d0f68d9
commit: dd55d44f408419278c00887bfcb2261d0caae350 staging: vboxvideo: Add vboxvideo to drivers/staging
date:   8 days ago
config: i386-randconfig-x071-07241824 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout dd55d44f408419278c00887bfcb2261d0caae350
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

>> ERROR: "gen_pool_virt_to_phys" [drivers/staging/vboxvideo/vboxvideo.ko] undefined!
>> ERROR: "gen_pool_add_virt" [drivers/staging/vboxvideo/vboxvideo.ko] undefined!
>> ERROR: "gen_pool_destroy" [drivers/staging/vboxvideo/vboxvideo.ko] undefined!
>> ERROR: "gen_pool_dma_alloc" [drivers/staging/vboxvideo/vboxvideo.ko] undefined!
>> ERROR: "gen_pool_create" [drivers/staging/vboxvideo/vboxvideo.ko] undefined!
>> ERROR: "gen_pool_free" [drivers/staging/vboxvideo/vboxvideo.ko] undefined!

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