tree: https://github.com/0day-ci/linux/commits/UPDATE-20210210-181758/Chris-Wil... head: 1f7d2908ed9121500324cfa7c81236dbf5f0d20d commit: 1f7d2908ed9121500324cfa7c81236dbf5f0d20d drm/i915: Check for scratch page scribbling date: 6 hours ago config: x86_64-randconfig-s021-20210209 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-215-g0fb77bb6-dirty # https://github.com/0day-ci/linux/commit/1f7d2908ed9121500324cfa7c81236dbf... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review UPDATE-20210210-181758/Chris-Wilson/drm-i915-Check-for-scratch-page-scribbling/20210210-180810 git checkout 1f7d2908ed9121500324cfa7c81236dbf5f0d20d # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' 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 >>): drivers/gpu/drm/i915/gt/intel_gtt.c: In function 'poison_scratch_page': 161 | set_page_dirty(pages); /* keep the poisoned contents */ | ^~~~~ | page drivers/gpu/drm/i915/gt/intel_gtt.c:161:18: note: each undeclared identifier is reported only once for each function it appears in vim +161 drivers/gpu/drm/i915/gt/intel_gtt.c 145 146 static void poison_scratch_page(struct drm_i915_gem_object *scratch) 147 { 148 struct sgt_iter sgt; 149 struct page *page; 150 u8 val; 151 152 val = 0; 153 if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) 154 val = POISON_FREE; 155 156 for_each_sgt_page(page, sgt, scratch->mm.pages) { 157 void *vaddr; 158 159 vaddr = kmap(page); 160 memset(vaddr, val, PAGE_SIZE); 162 kunmap(page); 163 } 164 } 165 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org