[kbuild-all] [linux-next:master 7056/9522] drivers/gpu/drm/tegra/dc.c:1856:2: warning: Value stored to 'old_dc_state' is never read [clang-analyzer-deadcode.DeadStores]

tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 86ed57fd8c93fdfaabb4f58e78455180fa7d8a84 commit: 04d5d5df9df79f9045e76404775fc8a084aac23d [7056/9522] drm/tegra: dc: Support memory bandwidth management config: arm-randconfig-c002-20210822 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 9e9d70591e72fc6762b4b9a226b68ed1307419bf) 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 arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 04d5d5df9df79f9045e76404775fc8a084aac23d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm clang-analyzer If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; clang-analyzer warnings: (new ones prefixed by >>) 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 7 warnings generated. Suppressed 7 warnings (7 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 7 warnings generated. Suppressed 7 warnings (7 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 7 warnings generated. Suppressed 7 warnings (7 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 7 warnings generated. Suppressed 7 warnings (7 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 7 warnings generated. Suppressed 7 warnings (7 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 7 warnings generated. Suppressed 7 warnings (7 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 8 warnings generated. Suppressed 8 warnings (8 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 14 warnings generated. old_dc_state = to_const_dc_state(old_crtc_state); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/tegra/dc.c:1856:2: note: Value stored to 'old_dc_state' is never read old_dc_state = to_const_dc_state(old_crtc_state); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ new_dc_state = to_const_dc_state(crtc->state); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/tegra/dc.c:1857:2: note: Value stored to 'new_dc_state' is never read new_dc_state = to_const_dc_state(crtc->state); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/tegra/dc.c:2145:2: warning: Value stored to 'value' is never read [clang-analyzer-deadcode.DeadStores] value = tegra_dc_readl(dc, DC_CMD_STATE_CONTROL); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/tegra/dc.c:2145:2: note: Value stored to 'value' is never read value = tegra_dc_readl(dc, DC_CMD_STATE_CONTROL); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/tegra/dc.c:2149:2: warning: Value stored to 'value' is never read [clang-analyzer-deadcode.DeadStores] value = tegra_dc_readl(dc, DC_CMD_STATE_CONTROL); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/tegra/dc.c:2149:2: note: Value stored to 'value' is never read value = tegra_dc_readl(dc, DC_CMD_STATE_CONTROL); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ old_state = drm_atomic_get_old_crtc_state(state, crtc); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/tegra/dc.c:2238:2: note: Value stored to 'old_state' is never read old_state = drm_atomic_get_old_crtc_state(state, crtc); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Suppressed 9 warnings (6 in non-user code, 3 with check filters). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 1 warning generated. drivers/gpu/drm/tegra/hda.c:53:3: warning: Value stored to 'bits' is never read [clang-analyzer-deadcode.DeadStores] bits = (format & AC_FMT_BITS_MASK) >> AC_FMT_BITS_SHIFT; ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/tegra/hda.c:53:3: note: Value stored to 'bits' is never read bits = (format & AC_FMT_BITS_MASK) >> AC_FMT_BITS_SHIFT; ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 2 warnings generated. Suppressed 2 warnings (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 6 warnings generated. Suppressed 6 warnings (6 in non-user code). vim +/old_dc_state +1856 drivers/gpu/drm/tegra/dc.c 1836 1837 static void 1838 tegra_crtc_update_memory_bandwidth(struct drm_crtc *crtc, 1839 struct drm_atomic_state *state, 1840 bool prepare_bandwidth_transition) 1841 { 1842 const struct tegra_plane_state *old_tegra_state, *new_tegra_state; 1843 const struct tegra_dc_state *old_dc_state, *new_dc_state; 1844 u32 i, new_avg_bw, old_avg_bw, new_peak_bw, old_peak_bw; 1845 const struct drm_plane_state *old_plane_state; 1846 const struct drm_crtc_state *old_crtc_state; 1847 struct tegra_dc_window window, old_window; 1848 struct tegra_dc *dc = to_tegra_dc(crtc); 1849 struct tegra_plane *tegra; 1850 struct drm_plane *plane; 1851 1852 if (dc->soc->has_nvdisplay) 1853 return; 1854 1855 old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc); 1858 1859 if (!crtc->state->active) { 1860 if (!old_crtc_state->active) 1861 return; 1862 1863 /* 1864 * When CRTC is disabled on DPMS, the state of attached planes 1865 * is kept unchanged. Hence we need to enforce removal of the 1866 * bandwidths from the ICC paths. 1867 */ 1868 drm_atomic_crtc_for_each_plane(plane, crtc) { 1869 tegra = to_tegra_plane(plane); 1870 1871 icc_set_bw(tegra->icc_mem, 0, 0); 1872 icc_set_bw(tegra->icc_mem_vfilter, 0, 0); 1873 } 1874 1875 return; 1876 } 1877 1878 for_each_old_plane_in_state(old_crtc_state->state, plane, 1879 old_plane_state, i) { 1880 old_tegra_state = to_const_tegra_plane_state(old_plane_state); 1881 new_tegra_state = to_const_tegra_plane_state(plane->state); 1882 tegra = to_tegra_plane(plane); 1883 1884 /* 1885 * We're iterating over the global atomic state and it contains 1886 * planes from another CRTC, hence we need to filter out the 1887 * planes unrelated to this CRTC. 1888 */ 1889 if (tegra->dc != dc) 1890 continue; 1891 1892 new_avg_bw = new_tegra_state->avg_memory_bandwidth; 1893 old_avg_bw = old_tegra_state->avg_memory_bandwidth; 1894 1895 new_peak_bw = new_tegra_state->total_peak_memory_bandwidth; 1896 old_peak_bw = old_tegra_state->total_peak_memory_bandwidth; 1897 1898 /* 1899 * See the comment related to !crtc->state->active above, 1900 * which explains why bandwidths need to be updated when 1901 * CRTC is turning ON. 1902 */ 1903 if (new_avg_bw == old_avg_bw && new_peak_bw == old_peak_bw && 1904 old_crtc_state->active) 1905 continue; 1906 1907 window.src.h = drm_rect_height(&plane->state->src) >> 16; 1908 window.dst.h = drm_rect_height(&plane->state->dst); 1909 1910 old_window.src.h = drm_rect_height(&old_plane_state->src) >> 16; 1911 old_window.dst.h = drm_rect_height(&old_plane_state->dst); 1912 1913 /* 1914 * During the preparation phase (atomic_begin), the memory 1915 * freq should go high before the DC changes are committed 1916 * if bandwidth requirement goes up, otherwise memory freq 1917 * should to stay high if BW requirement goes down. The 1918 * opposite applies to the completion phase (post_commit). 1919 */ 1920 if (prepare_bandwidth_transition) { 1921 new_avg_bw = max(old_avg_bw, new_avg_bw); 1922 new_peak_bw = max(old_peak_bw, new_peak_bw); 1923 1924 if (tegra_plane_use_vertical_filtering(tegra, &old_window)) 1925 window = old_window; 1926 } 1927 1928 icc_set_bw(tegra->icc_mem, new_avg_bw, new_peak_bw); 1929 1930 if (tegra_plane_use_vertical_filtering(tegra, &window)) 1931 icc_set_bw(tegra->icc_mem_vfilter, new_avg_bw, new_peak_bw); 1932 else 1933 icc_set_bw(tegra->icc_mem_vfilter, 0, 0); 1934 } 1935 } 1936 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org