[rcu:dev.2019.04.02a 35/52] drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:45: undefined reference to `kfd_processes_srcu'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2019.04.02a
head:   82d94d0c3c616bba12f1f2a7f2ea48a3363893c8
commit: 7950d16b08477aee3ea9aa77fb99a8650bc9378d [35/52] drivers/gpu/drm/amd: Dynamically allocate kfd_processes_srcu
config: i386-randconfig-m1-04050455 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 7950d16b08477aee3ea9aa77fb99a8650bc9378d
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.o: In function `amdgpu_amdkfd_init':
>> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:45: undefined reference to `kfd_processes_srcu'
   drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.o: In function `amdgpu_amdkfd_fini':
   drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c:64: undefined reference to `kfd_processes_srcu'

vim +45 drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c

    39	
    40	int amdgpu_amdkfd_init(void)
    41	{
    42		struct sysinfo si;
    43		int ret;
    44	
  > 45		ret = init_srcu_struct(&kfd_processes_srcu);
    46		WARN_ON(ret);
    47		si_meminfo(&si);
    48		amdgpu_amdkfd_total_mem_size = si.totalram - si.totalhigh;
    49		amdgpu_amdkfd_total_mem_size *= si.mem_unit;
    50	

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