vbox_hgsmi.c:undefined reference to `gen_pool_dma_alloc'

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

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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: x86_64-randconfig-s4-07251602 (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_hgsmi.o: In function `hgsmi_buffer_alloc':
>> vbox_hgsmi.c:(.text+0x48): undefined reference to `gen_pool_dma_alloc'
   drivers/staging/vboxvideo/vbox_hgsmi.o: In function `hgsmi_buffer_free':
>> vbox_hgsmi.c:(.text+0xe3): undefined reference to `gen_pool_free'
   drivers/staging/vboxvideo/vbox_hgsmi.o: In function `hgsmi_buffer_submit':
>> vbox_hgsmi.c:(.text+0xf2): undefined reference to `gen_pool_virt_to_phys'
   drivers/staging/vboxvideo/vbox_main.o: In function `vbox_hw_fini':
>> vbox_main.c:(.text+0xf9): undefined reference to `gen_pool_destroy'
   drivers/staging/vboxvideo/vbox_main.o: In function `vbox_driver_load':
>> vbox_main.c:(.text+0x487): undefined reference to `gen_pool_create'
>> vbox_main.c:(.text+0x4b2): undefined reference to `gen_pool_add_virt'
   vbox_main.c:(.text+0x614): undefined reference to `gen_pool_destroy'

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