Hi Jinzhou,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   17e7124aad766b3f158943acb51467f86220afe9
commit: ecaafb7b5ab6406587341d8727f237b3ee00dedf drm/amdgpu: Add secure display TA interface
date:   3 months ago
config: arm64-randconfig-r035-20210409 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project dd453a1389b6a7e6d9214b449d3c54981b1a89b6)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ecaafb7b5ab6406587341d8727f237b3ee00dedf
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout ecaafb7b5ab6406587341d8727f237b3ee00dedf
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c:159:37: warning: unused variable 'amdgpu_securedisplay_debugfs_ops' [-Wunused-const-variable]
   static const struct file_operations amdgpu_securedisplay_debugfs_ops = {
                                       ^
   1 warning generated.


vim +/amdgpu_securedisplay_debugfs_ops +159 drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c

   158	
 > 159	static const struct file_operations amdgpu_securedisplay_debugfs_ops = {
   160		.owner = THIS_MODULE,
   161		.read = NULL,
   162		.write = amdgpu_securedisplay_debugfs_write,
   163		.llseek = default_llseek
   164	};
   165	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org