vbox_fb.c:undefined reference to `ttm_bo_add_to_lru'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0b5477d9dabd96ded4c5ef7a5f08b00188fc1dec
commit: dd55d44f408419278c00887bfcb2261d0caae350 staging: vboxvideo: Add vboxvideo to drivers/staging
date:   11 days ago
config: x86_64-randconfig-ws0-07281558 (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=x86_64 

All errors (new ones prefixed by >>):

   drivers/staging/vboxvideo/vbox_fb.o: In function `vbox_dirty_update':
>> vbox_fb.c:(.text+0x2e4): undefined reference to `ttm_bo_add_to_lru'
>> vbox_fb.c:(.text+0x355): undefined reference to `ttm_bo_del_sub_from_lru'
   drivers/staging/vboxvideo/vbox_fb.o: In function `vboxfb_create':
   vbox_fb.c:(.text+0x675): undefined reference to `ttm_bo_del_sub_from_lru'
   vbox_fb.c:(.text+0x6d5): undefined reference to `ttm_bo_add_to_lru'
>> vbox_fb.c:(.text+0x74f): undefined reference to `ttm_bo_kmap'
   vbox_fb.c:(.text+0x78d): undefined reference to `ttm_bo_add_to_lru'
   drivers/staging/vboxvideo/vbox_fb.o: In function `vbox_fbdev_fini':
   vbox_fb.c:(.text+0xb6d): undefined reference to `ttm_bo_del_sub_from_lru'
>> vbox_fb.c:(.text+0xb8f): undefined reference to `ttm_bo_kunmap'
   vbox_fb.c:(.text+0xbeb): undefined reference to `ttm_bo_add_to_lru'
   drivers/staging/vboxvideo/vbox_main.o: In function `vbox_gem_free_object':
>> vbox_main.c:(.text+0xc5d): undefined reference to `ttm_bo_unref'
   drivers/staging/vboxvideo/vbox_mode.o: In function `vbox_cursor_set2':
>> vbox_mode.c:(.text+0x561): undefined reference to `ttm_bo_del_sub_from_lru'
>> vbox_mode.c:(.text+0x60c): undefined reference to `ttm_bo_kmap'
>> vbox_mode.c:(.text+0x73c): undefined reference to `ttm_bo_kunmap'
>> vbox_mode.c:(.text+0x777): undefined reference to `ttm_bo_add_to_lru'
   drivers/staging/vboxvideo/vbox_mode.o: In function `vbox_crtc_mode_set':
   vbox_mode.c:(.text+0x109c): undefined reference to `ttm_bo_del_sub_from_lru'
   vbox_mode.c:(.text+0x10e3): undefined reference to `ttm_bo_add_to_lru'
   vbox_mode.c:(.text+0x11ab): undefined reference to `ttm_bo_del_sub_from_lru'
   vbox_mode.c:(.text+0x1204): undefined reference to `ttm_bo_add_to_lru'
   vbox_mode.c:(.text+0x12be): undefined reference to `ttm_bo_add_to_lru'
   drivers/staging/vboxvideo/vbox_ttm.o: In function `vbox_bo_move':
>> vbox_ttm.c:(.text+0xd4): undefined reference to `ttm_bo_move_memcpy'
   drivers/staging/vboxvideo/vbox_ttm.o: In function `vbox_bo_init_mem_type':
>> vbox_ttm.c:(.text+0x177): undefined reference to `ttm_bo_manager_func'
   drivers/staging/vboxvideo/vbox_ttm.o: In function `vbox_ttm_tt_unpopulate':
>> vbox_ttm.c:(.text+0x19f): undefined reference to `ttm_pool_unpopulate'
   drivers/staging/vboxvideo/vbox_ttm.o: In function `vbox_ttm_tt_populate':
>> vbox_ttm.c:(.text+0x1b8): undefined reference to `ttm_pool_populate'
   drivers/staging/vboxvideo/vbox_ttm.o: In function `vbox_ttm_backend_destroy':
>> vbox_ttm.c:(.text+0x1d5): undefined reference to `ttm_tt_fini'
   drivers/staging/vboxvideo/vbox_ttm.o: In function `vbox_ttm_tt_create':
>> vbox_ttm.c:(.text+0x255): undefined reference to `ttm_tt_init'
   drivers/staging/vboxvideo/vbox_ttm.o: In function `vbox_ttm_mem_global_release':
>> vbox_ttm.c:(.text+0x2cb): undefined reference to `ttm_mem_global_release'
   drivers/staging/vboxvideo/vbox_ttm.o: In function `vbox_ttm_mem_global_init':
>> vbox_ttm.c:(.text+0x2e8): undefined reference to `ttm_mem_global_init'
   drivers/staging/vboxvideo/vbox_ttm.o: In function `vbox_mm_init':
>> vbox_ttm.c:(.text+0x38f): undefined reference to `ttm_bo_global_init'
>> vbox_ttm.c:(.text+0x39a): undefined reference to `ttm_bo_global_release'
>> vbox_ttm.c:(.text+0x435): undefined reference to `ttm_bo_device_init'

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