Hi Matthew, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on drm-tip/drm-tip] [also build test WARNING on next-20211012] [cannot apply to drm-intel/for-linux-next drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next airlied/drm-next v5.15-rc5] [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/Matthew-Auld/drm-i915-gem-Break-out-some-shmem-backend-utils/20211011-230443 base: git://anongit.freedesktop.org/drm/drm-tip drm-tip config: i386-randconfig-c001-20211012 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c3dcf39554dbea780d6cb7e12239451ba47a2668) 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://github.com/0day-ci/linux/commit/43578548b98c603bc1bd2840b3e50bfde8bf0772 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Matthew-Auld/drm-i915-gem-Break-out-some-shmem-backend-utils/20211011-230443 git checkout 43578548b98c603bc1bd2840b3e50bfde8bf0772 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=i386 clang-analyzer If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> clang-analyzer warnings: (new ones prefixed by >>) >> drivers/gpu/drm/i915/gem/i915_gem_ttm.c:865:23: warning: Value stored to 'i915_tt' during its initialization is never read [clang-analyzer-deadcode.DeadStores] struct i915_ttm_tt *i915_tt = ^~~~~~~ vim +/i915_tt +865 drivers/gpu/drm/i915/gem/i915_gem_ttm.c 213d5092776345a Thomas Hellström 2021-06-10 819 b6e913e19c54edd Thomas Hellström 2021-06-29 820 static int __i915_ttm_get_pages(struct drm_i915_gem_object *obj, b6e913e19c54edd Thomas Hellström 2021-06-29 821 struct ttm_placement *placement) 213d5092776345a Thomas Hellström 2021-06-10 822 { 213d5092776345a Thomas Hellström 2021-06-10 823 struct ttm_buffer_object *bo = i915_gem_to_ttm(obj); 213d5092776345a Thomas Hellström 2021-06-10 824 struct ttm_operation_ctx ctx = { 213d5092776345a Thomas Hellström 2021-06-10 825 .interruptible = true, 213d5092776345a Thomas Hellström 2021-06-10 826 .no_wait_gpu = false, 213d5092776345a Thomas Hellström 2021-06-10 827 }; 213d5092776345a Thomas Hellström 2021-06-10 828 struct sg_table *st; b07a6483839a838 Thomas Hellström 2021-06-18 829 int real_num_busy; 213d5092776345a Thomas Hellström 2021-06-10 830 int ret; 213d5092776345a Thomas Hellström 2021-06-10 831 b07a6483839a838 Thomas Hellström 2021-06-18 832 /* First try only the requested placement. No eviction. */ b6e913e19c54edd Thomas Hellström 2021-06-29 833 real_num_busy = fetch_and_zero(&placement->num_busy_placement); b6e913e19c54edd Thomas Hellström 2021-06-29 834 ret = ttm_bo_validate(bo, placement, &ctx); b07a6483839a838 Thomas Hellström 2021-06-18 835 if (ret) { b07a6483839a838 Thomas Hellström 2021-06-18 836 ret = i915_ttm_err_to_gem(ret); b07a6483839a838 Thomas Hellström 2021-06-18 837 /* b07a6483839a838 Thomas Hellström 2021-06-18 838 * Anything that wants to restart the operation gets to b07a6483839a838 Thomas Hellström 2021-06-18 839 * do that. b07a6483839a838 Thomas Hellström 2021-06-18 840 */ b07a6483839a838 Thomas Hellström 2021-06-18 841 if (ret == -EDEADLK || ret == -EINTR || ret == -ERESTARTSYS || b07a6483839a838 Thomas Hellström 2021-06-18 842 ret == -EAGAIN) b07a6483839a838 Thomas Hellström 2021-06-18 843 return ret; b07a6483839a838 Thomas Hellström 2021-06-18 844 b07a6483839a838 Thomas Hellström 2021-06-18 845 /* b07a6483839a838 Thomas Hellström 2021-06-18 846 * If the initial attempt fails, allow all accepted placements, b07a6483839a838 Thomas Hellström 2021-06-18 847 * evicting if necessary. b07a6483839a838 Thomas Hellström 2021-06-18 848 */ b6e913e19c54edd Thomas Hellström 2021-06-29 849 placement->num_busy_placement = real_num_busy; b6e913e19c54edd Thomas Hellström 2021-06-29 850 ret = ttm_bo_validate(bo, placement, &ctx); 213d5092776345a Thomas Hellström 2021-06-10 851 if (ret) b07a6483839a838 Thomas Hellström 2021-06-18 852 return i915_ttm_err_to_gem(ret); b07a6483839a838 Thomas Hellström 2021-06-18 853 } 213d5092776345a Thomas Hellström 2021-06-10 854 3c2b8f326e7f73d Thomas Hellström 2021-06-24 855 if (bo->ttm && !ttm_tt_is_populated(bo->ttm)) { 3c2b8f326e7f73d Thomas Hellström 2021-06-24 856 ret = ttm_tt_populate(bo->bdev, bo->ttm, &ctx); 3c2b8f326e7f73d Thomas Hellström 2021-06-24 857 if (ret) 3c2b8f326e7f73d Thomas Hellström 2021-06-24 858 return ret; 3c2b8f326e7f73d Thomas Hellström 2021-06-24 859 3c2b8f326e7f73d Thomas Hellström 2021-06-24 860 i915_ttm_adjust_domains_after_move(obj); 3c2b8f326e7f73d Thomas Hellström 2021-06-24 861 i915_ttm_adjust_gem_after_move(obj); 3c2b8f326e7f73d Thomas Hellström 2021-06-24 862 } 3c2b8f326e7f73d Thomas Hellström 2021-06-24 863 75e382850b7ea51 Jason Ekstrand 2021-07-23 864 if (!i915_gem_object_has_pages(obj)) { 3ffdf7a46488d57 Matthew Auld 2021-10-11 @865 struct i915_ttm_tt *i915_tt = 3ffdf7a46488d57 Matthew Auld 2021-10-11 866 container_of(bo->ttm, typeof(*i915_tt), ttm); 3ffdf7a46488d57 Matthew Auld 2021-10-11 867 213d5092776345a Thomas Hellström 2021-06-10 868 /* Object either has a page vector or is an iomem object */ 213d5092776345a Thomas Hellström 2021-06-10 869 st = bo->ttm ? i915_ttm_tt_get_st(bo->ttm) : obj->ttm.cached_io_st; 213d5092776345a Thomas Hellström 2021-06-10 870 if (IS_ERR(st)) 213d5092776345a Thomas Hellström 2021-06-10 871 return PTR_ERR(st); 213d5092776345a Thomas Hellström 2021-06-10 872 213d5092776345a Thomas Hellström 2021-06-10 873 __i915_gem_object_set_pages(obj, st, i915_sg_dma_sizes(st->sgl)); 75e382850b7ea51 Jason Ekstrand 2021-07-23 874 } 213d5092776345a Thomas Hellström 2021-06-10 875 43578548b98c603 Matthew Auld 2021-10-11 876 i915_ttm_adjust_lru(obj); 213d5092776345a Thomas Hellström 2021-06-10 877 return ret; 213d5092776345a Thomas Hellström 2021-06-10 878 } 213d5092776345a Thomas Hellström 2021-06-10 879 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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