tree: git://linuxtv.org/pinchartl/media.git media/drm/du/v3u head: 897fa921c2e92514cb1a6d9395d5d70d254cd3d0 commit: c6b5acb07fd4b8e0ca566e64b688c17126b80e90 [16/28] drm: rcar-du: Add R-Car DSI driver config: arc-allyesconfig (attached as .config) compiler: arceb-elf-gcc (GCC) 9.3.0 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 git remote add pinchartl-media git://linuxtv.org/pinchartl/media.git git fetch --no-tags pinchartl-media media/drm/du/v3u git checkout c6b5acb07fd4b8e0ca566e64b688c17126b80e90 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arc 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 >>): 95 | {2100000000, 0x41}, {2150000000, 0x42}, {2200000000, 0x43}, | ^ drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:96:2: warning: this decimal constant is unsigned only in ISO C90 96 | {2250000000, 0x44}, {2300000000, 0x45}, {2350000000, 0x46}, | ^ drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:96:2: warning: this decimal constant is unsigned only in ISO C90 drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:96:2: warning: this decimal constant is unsigned only in ISO C90 drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:97:2: warning: this decimal constant is unsigned only in ISO C90 97 | {2400000000, 0x47}, {2450000000, 0x48}, {2500000000, 0x49}, | ^ drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:97:2: warning: this decimal constant is unsigned only in ISO C90 drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c:97:2: warning: this decimal constant is unsigned only in ISO C90 613 | int rcar_mipi_dsi_clk_enable(struct drm_bridge *bridge) | ^~~~~~~~~~~~~~~~~~~~~~~~ 636 | void rcar_mipi_dsi_clk_disable(struct drm_bridge *bridge) | ^~~~~~~~~~~~~~~~~~~~~~~~~ vim +95 drivers/gpu/drm/rcar-du/rcar_mipi_dsi.c 75 76 static const u32 hsfreqrange_table[][2] = { 77 {80000000, 0x00}, {90000000, 0x10}, {100000000, 0x20}, 78 {110000000, 0x30}, {120000000, 0x01}, {130000000, 0x11}, 79 {140000000, 0x21}, {150000000, 0x31}, {160000000, 0x02}, 80 {170000000, 0x12}, {180000000, 0x22}, {190000000, 0x32}, 81 {205000000, 0x03}, {220000000, 0x13}, {235000000, 0x23}, 82 {250000000, 0x33}, {275000000, 0x04}, {300000000, 0x14}, 83 {325000000, 0x25}, {350000000, 0x35}, {400000000, 0x05}, 84 {450000000, 0x16}, {500000000, 0x26}, {550000000, 0x37}, 85 {600000000, 0x07}, {650000000, 0x18}, {700000000, 0x28}, 86 {750000000, 0x39}, {800000000, 0x09}, {850000000, 0x19}, 87 {900000000, 0x29}, {950000000, 0x3a}, {1000000000, 0x0a}, 88 {1050000000, 0x1a}, {1100000000, 0x2a}, {1150000000, 0x3b}, 89 {1200000000, 0x0b}, {1250000000, 0x1b}, {1300000000, 0x2b}, 90 {1350000000, 0x3c}, {1400000000, 0x0c}, {1450000000, 0x1c}, 91 {1500000000, 0x2c}, {1550000000, 0x3d}, {1600000000, 0x0d}, 92 {1650000000, 0x1d}, {1700000000, 0x2e}, {1750000000, 0x3e}, 93 {1800000000, 0x0e}, {1850000000, 0x1e}, {1900000000, 0x2f}, 94 {1950000000, 0x3f}, {2000000000, 0x0f}, {2050000000, 0x40}, 96 {2250000000, 0x44}, {2300000000, 0x45}, {2350000000, 0x46}, 97 {2400000000, 0x47}, {2450000000, 0x48}, {2500000000, 0x49}, 98 { /* sentinel */ }, 99 }; 100 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org