tree:   https://github.com/superna9999/linux amlogic/v5.16/drm-meson-rework
head:   828c002903e8e4b663a411c26dab3de64cc808ab
commit: c346eb228e8fbc65ce560906f3e8d85d60dbfce7 [4/8] drm/meson: split out encoder from meson_dw_hdmi
config: arm64-randconfig-r005-20211027 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 5db7568a6a1fcb408eb8988abdaff2a225a8eb72)
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://github.com/superna9999/linux/commit/c346eb228e8fbc65ce560906f3e8d85d60dbfce7
        git remote add superna9999 https://github.com/superna9999/linux
        git fetch --no-tags superna9999 amlogic/v5.16/drm-meson-rework
        git checkout c346eb228e8fbc65ce560906f3e8d85d60dbfce7
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 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/meson/meson_encoder_hdmi.c:312:5: warning: no previous prototype for function 'meson_encoder_hdmi_init' [-Wmissing-prototypes]
   int meson_encoder_hdmi_init(struct meson_drm *priv)
       ^
   drivers/gpu/drm/meson/meson_encoder_hdmi.c:312:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int meson_encoder_hdmi_init(struct meson_drm *priv)
   ^
   static 
   1 warning generated.


vim +/meson_encoder_hdmi_init +312 drivers/gpu/drm/meson/meson_encoder_hdmi.c

   311	
 > 312	int meson_encoder_hdmi_init(struct meson_drm *priv)

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