drm/amd/display: Simplify hdcp validate_bksv

[Joe Perches]

On Mon, 2021-07-12 at 07:02 +0800, kernel test robot wrote:
> Hi Joe,
> 
> I love your patch! Yet something to improve:
> 
> [auto build test ERROR on drm-intel/for-linux-next]
> [also build test ERROR on drm-exynos/exynos-drm-next linus/master next-20210709]
> [cannot apply to kees/for-next/pstore tegra-drm/drm/tegra/for-next drm/drm-next v5.13]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch]
> 
> url:    https://github.com/0day-ci/linux/commits/Joe-Perches/drm-amd-display-Simplify-hdcp-validate_bksv/20210712-034708
> base:   git://anongit.freedesktop.org/drm-intel for-linux-next
> config: i386-randconfig-a003-20210712 (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> reproduce (this is a W=1 build):
>         # https://github.com/0day-ci/linux/commit/66fae2c1becdcb71c95f2c6a6413de4dfe1deb51
>         git remote add linux-review https://github.com/0day-ci/linux
>         git fetch --no-tags linux-review Joe-Perches/drm-amd-display-Simplify-hdcp-validate_bksv/20210712-034708
>         git checkout 66fae2c1becdcb71c95f2c6a6413de4dfe1deb51
>         # save the attached .config to linux build tree
>         make W=1 ARCH=i386 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp at intel.com>
> 
> All errors (new ones prefixed by >>, old ones prefixed by <<):
> 
> > > ERROR: modpost: "__popcountdi2" [drivers/gpu/drm/amd/amdgpu/amdgpu.ko] undefined!

curious.

Anyone know why?