Hi Zhenyu, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: df0cc57e057f18e44dac8e6c18aba47ab53202f9 commit: 145e06b58f8625becc61792a0554726314297a85 drm/i915/gvt: Move mdev attribute groups into kvmgt module date: 8 months ago config: x86_64-randconfig-a016-20210927 (https://download.01.org/0day-ci/archive/20220110/202201102031.xPWND4ZH-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dc6e8dfdfe7efecfda318d43a06fae18b40eb498) 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 # 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 145e06b58f8625becc61792a0554726314297a85 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/ 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 >>): * Check if can do 2M page drivers/gpu/drm/i915/gvt/gtt.c:2209: warning: expecting prototype for intel_vgpu_emulate_gtt_mmio_read(). Prototype was for intel_vgpu_emulate_ggtt_mmio_read() instead vim +1152 drivers/gpu/drm/i915/gvt/gtt.c 2707e44466881d Zhi Wang 2016-03-28 1150 b901b252b6cf5c Changbin Du 2018-05-15 1151 /** a752b070a67823 Zhenyu Wang 2018-07-31 @1152 * Check if can do 2M page a752b070a67823 Zhenyu Wang 2018-07-31 1153 * @vgpu: target vgpu a752b070a67823 Zhenyu Wang 2018-07-31 1154 * @entry: target pfn's gtt entry a752b070a67823 Zhenyu Wang 2018-07-31 1155 * 9317f356df83a5 Bhaskar Chowdhury 2021-02-22 1156 * Return 1 if 2MB huge gtt shadowing is possible, 0 if miscondition, 9317f356df83a5 Bhaskar Chowdhury 2021-02-22 1157 * negative if found err. b901b252b6cf5c Changbin Du 2018-05-15 1158 */ b901b252b6cf5c Changbin Du 2018-05-15 1159 static int is_2MB_gtt_possible(struct intel_vgpu *vgpu, b901b252b6cf5c Changbin Du 2018-05-15 1160 struct intel_gvt_gtt_entry *entry) b901b252b6cf5c Changbin Du 2018-05-15 1161 { b901b252b6cf5c Changbin Du 2018-05-15 1162 struct intel_gvt_gtt_pte_ops *ops = vgpu->gvt->gtt.pte_ops; b901b252b6cf5c Changbin Du 2018-05-15 1163 unsigned long pfn; b901b252b6cf5c Changbin Du 2018-05-15 1164 a61ac1e75105a0 Chris Wilson 2020-03-06 1165 if (!HAS_PAGE_SIZES(vgpu->gvt->gt->i915, I915_GTT_PAGE_SIZE_2M)) b901b252b6cf5c Changbin Du 2018-05-15 1166 return 0; b901b252b6cf5c Changbin Du 2018-05-15 1167 b901b252b6cf5c Changbin Du 2018-05-15 1168 pfn = intel_gvt_hypervisor_gfn_to_mfn(vgpu, ops->get_pfn(entry)); b901b252b6cf5c Changbin Du 2018-05-15 1169 if (pfn == INTEL_GVT_INVALID_ADDR) b901b252b6cf5c Changbin Du 2018-05-15 1170 return -EINVAL; b901b252b6cf5c Changbin Du 2018-05-15 1171 b901b252b6cf5c Changbin Du 2018-05-15 1172 return PageTransHuge(pfn_to_page(pfn)); b901b252b6cf5c Changbin Du 2018-05-15 1173 } b901b252b6cf5c Changbin Du 2018-05-15 1174 :::::: The code at line 1152 was first introduced by commit :::::: a752b070a67823174565322cc48b2668daf9a8da drm/i915/gvt: Fix function comment doc errors :::::: TO: Zhenyu Wang <zhenyuw(a)linux.intel.com&gt; :::::: CC: Zhenyu Wang <zhenyuw(a)linux.intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org