Hi Xiong, I love your patch! Perhaps something to improve: [auto build test WARNING on drm-intel/for-linux-next] [also build test WARNING on drm-tip/drm-tip v5.10 next-20201211] [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/Xiong-Zhang/drm-i915-Try-to-guess-PCH-type-even-without-ISA-bridge/20201214-150157 base: git://anongit.freedesktop.org/drm-intel for-linux-next config: x86_64-randconfig-a002-20201214 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project d38205144febf4dc42c9270c6aa3d978f1ef65e1) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/718272991fa5c06a48629bce020ecfbdea006f96 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Xiong-Zhang/drm-i915-Try-to-guess-PCH-type-even-without-ISA-bridge/20201214-150157 git checkout 718272991fa5c06a48629bce020ecfbdea006f96 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/gpu/drm/i915/intel_pch.c:187:6: warning: no previous prototype for function 'intel_detect_pch_virt' [-Wmissing-prototypes] void intel_detect_pch_virt(struct drm_i915_private *dev_priv) ^ drivers/gpu/drm/i915/intel_pch.c:187:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void intel_detect_pch_virt(struct drm_i915_private *dev_priv) ^ static 1 warning generated. vim +/intel_detect_pch_virt +187 drivers/gpu/drm/i915/intel_pch.c 186 > 187 void intel_detect_pch_virt(struct drm_i915_private *dev_priv) 188 { 189 unsigned short id; 190 enum intel_pch pch_type; 191 192 id = intel_virt_detect_pch(dev_priv); 193 pch_type = intel_pch_type(dev_priv, id); 194 195 /* Sanity check virtual PCH id */ 196 if (drm_WARN_ON(&dev_priv->drm, 197 id && pch_type == PCH_NONE)) 198 id = 0; 199 200 dev_priv->pch_type = pch_type; 201 dev_priv->pch_id = id; 202 } 203 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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