Hi Daniele, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 2734d6c1b1a089fb593ef6a23d4b70903526fe0c commit: 1fb12c5871521eab5fa428bf265841b1a3827a97 drm/i915/guc: skip disabling CTBs before sanitizing the GuC date: 7 weeks ago config: x86_64-randconfig-r024-20210720 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 5d5b08761f944d5b9822d582378333cc4b36a0a7) 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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 1fb12c5871521eab5fa428bf265841b1a3827a97 # 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 errors (new ones prefixed by >>): static inline bool guc_communication_enabled(struct intel_guc *guc) ^ 1 error generated. vim +/guc_communication_enabled +162 drivers/gpu/drm/i915/gt/uc/intel_uc.c a9410a62506430 Daniele Ceraolo Spurio 2020-03-26 161 8c69bd74a00baf Daniele Ceraolo Spurio 2019-12-16 @162 static inline bool guc_communication_enabled(struct intel_guc *guc) 8c69bd74a00baf Daniele Ceraolo Spurio 2019-12-16 163 { 8c69bd74a00baf Daniele Ceraolo Spurio 2019-12-16 164 return intel_guc_ct_enabled(&guc->ct); 8c69bd74a00baf Daniele Ceraolo Spurio 2019-12-16 165 } 8c69bd74a00baf Daniele Ceraolo Spurio 2019-12-16 166 :::::: The code at line 162 was first introduced by commit :::::: 8c69bd74a00baff85f4ef46b9f79263a42e0d82c drm/i915/guc: Remove function pointers for send/receive calls :::::: TO: Daniele Ceraolo Spurio <daniele.ceraolospurio(a)intel.com&gt; :::::: CC: Daniele Ceraolo Spurio <daniele.ceraolospurio(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org