[radeon-alex:drm-next-4.9-wip 361/376] vi.c:undefined reference to `amd_set_clockgating_by_smu'

[kbuild test robot]

tree:   git://people.freedesktop.org/~agd5f/linux.git drm-next-4.9-wip
head:   68d58d150a5e5c54fae3209b6e3f91fb631affb5
commit: 167100684896b8a72c15c7ea8520c9d946400d24 [361/376] drm/amdgpu: set system clock gating for tonga/polaris.
config: i386-randconfig-a0-201638 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 167100684896b8a72c15c7ea8520c9d946400d24
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `vi_common_set_clockgating_state':
>> vi.c:(.text+0x191829): undefined reference to `amd_set_clockgating_by_smu'
   vi.c:(.text+0x191838): undefined reference to `amd_set_clockgating_by_smu'
   vi.c:(.text+0x191847): undefined reference to `amd_set_clockgating_by_smu'
   vi.c:(.text+0x191856): undefined reference to `amd_set_clockgating_by_smu'
   vi.c:(.text+0x191865): undefined reference to `amd_set_clockgating_by_smu'
   drivers/built-in.o:vi.c:(.text+0x19187a): more undefined references to `amd_set_clockgating_by_smu' follow

---
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