Hi Sean, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on next-20201113] [also build test WARNING on v5.10-rc3] [cannot apply to drm-intel/for-linux-next char-misc/char-misc-testing v5.10-rc3 v5.10-rc2 v5.10-rc1] [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/Sean-Z-Huang/drm-i915-pxp-Introd... base: 92edc4aef86780a8ad01b092c6d6630bb3cb423d config: x86_64-randconfig-a004-20201113 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 9a85643cd357e412cff69067bb5c4840e228c2ab) 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/b2c5c38f134701a462cb7e880c4cebcd7... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sean-Z-Huang/drm-i915-pxp-Introduce-Intel-PXP-component/20201114-094926 git checkout b2c5c38f134701a462cb7e880c4cebcd79e1d8c6 # 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(a)intel.com&gt; All warnings (new ones prefixed by >>): drivers/gpu/drm/i915/pxp/intel_pxp_sm.c:175:5: warning: no previous prototype for function 'pxp_sm_reg_read' [-Wmissing-prototypes] int pxp_sm_reg_read(struct drm_i915_private *i915, u32 offset, u32 *regval) ^ drivers/gpu/drm/i915/pxp/intel_pxp_sm.c:175:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int pxp_sm_reg_read(struct drm_i915_private *i915, u32 offset, u32 *regval) ^ static int intel_pxp_sm_destroy_all_sw_sessions(struct drm_i915_private *i915, int session_type) ^ drivers/gpu/drm/i915/pxp/intel_pxp_sm.c:1146:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int intel_pxp_sm_destroy_all_sw_sessions(struct drm_i915_private *i915, int session_type) ^ static 2 warnings generated. vim +/intel_pxp_sm_destroy_all_sw_sessions +1146 drivers/gpu/drm/i915/pxp/intel_pxp_sm.c 1145 1147 { 1148 int ret = 0; 1149 struct pxp_protected_session *current_session, *n; 1150 1151 list_for_each_entry_safe(current_session, n, pxp_session_list(i915, session_type), session_list) { 1152 ret = pxp_set_pxp_tag(i915, session_type, current_session->session_index, PROTECTION_MODE_NONE); 1153 if (ret) 1154 drm_dbg(&i915->drm, "Failed to pxp_set_pxp_tag()\n"); 1155 1156 list_del(&current_session->session_list); 1157 kfree(current_session); 1158 } 1159 1160 return ret; 1161 } 1162 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org