[kbuild-all] drivers/dma/dw-edma/dw-edma-v0-regs.h:37:4: warning: field sar within 'struct dw_edma_v0_ch_regs' is less aligned than 'union (unnamed union at drivers/dma/dw-edma/dw-edma-v0-regs.h:31:2)' and is usually due to 'struct dw_edma_v0_ch_regs' being packed, wh...

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 2c271fe77d52a0555161926c232cd5bc07178b39 commit: 04e0a39fc10f82a71b84af73351333b184cee578 dmaengine: dw-edma: Add writeq() and readq() for 64 bits architectures date: 10 months ago config: arm-randconfig-r001-20220120 (https://download.01.org/0day-ci/archive/20220121/202201211416.lYF8kJns-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d4baf3b1322b84816aa623d8e8cb45a49cb68b84) 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/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 04e0a39fc10f82a71b84af73351333b184cee578 # 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=arm SHELL=/bin/bash drivers/dma/ 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 >>): In file included from drivers/dma/dw-edma/dw-edma-v0-core.c:13: } sar; ^ } dar; ^ } llp; ^ } rd_err_status; ^ } rd_done_imwr; ^ } rd_abort_imwr; ^ } wr_engine_hshake_cnt; ^ } rd_engine_hshake_cnt; ^ 8 warnings generated. vim +37 drivers/dma/dw-edma/dw-edma-v0-regs.h 26 27 struct dw_edma_v0_ch_regs { 28 u32 ch_control1; /* 0x000 */ 29 u32 ch_control2; /* 0x004 */ 30 u32 transfer_size; /* 0x008 */ 31 union { 32 u64 reg; /* 0x00c..0x010 */ 33 struct { 34 u32 lsb; /* 0x00c */ 35 u32 msb; /* 0x010 */ 36 }; 38 union { 39 u64 reg; /* 0x014..0x018 */ 40 struct { 41 u32 lsb; /* 0x014 */ 42 u32 msb; /* 0x018 */ 43 }; 45 union { 46 u64 reg; /* 0x01c..0x020 */ 47 struct { 48 u32 lsb; /* 0x01c */ 49 u32 msb; /* 0x020 */ 50 }; 52 } __packed; 53 54 struct dw_edma_v0_ch { 55 struct dw_edma_v0_ch_regs wr; /* 0x200 */ 56 u32 padding_1[55]; /* [0x224..0x2fc] */ 57 struct dw_edma_v0_ch_regs rd; /* 0x300 */ 58 u32 padding_2[55]; /* [0x324..0x3fc] */ 59 } __packed; 60 61 struct dw_edma_v0_unroll { 62 u32 padding_1; /* 0x0f8 */ 63 u32 wr_engine_chgroup; /* 0x100 */ 64 u32 rd_engine_chgroup; /* 0x104 */ 65 union { 66 u64 reg; /* 0x108..0x10c */ 67 struct { 68 u32 lsb; /* 0x108 */ 69 u32 msb; /* 0x10c */ 70 }; 72 u32 padding_2[2]; /* [0x110..0x114] */ 73 union { 74 u64 reg; /* 0x120..0x124 */ 75 struct { 76 u32 lsb; /* 0x120 */ 77 u32 msb; /* 0x124 */ 78 }; 80 u32 padding_3[2]; /* [0x120..0x124] */ 81 u32 wr_ch0_pwr_en; /* 0x128 */ 82 u32 wr_ch1_pwr_en; /* 0x12c */ 83 u32 wr_ch2_pwr_en; /* 0x130 */ 84 u32 wr_ch3_pwr_en; /* 0x134 */ 85 u32 wr_ch4_pwr_en; /* 0x138 */ 86 u32 wr_ch5_pwr_en; /* 0x13c */ 87 u32 wr_ch6_pwr_en; /* 0x140 */ 88 u32 wr_ch7_pwr_en; /* 0x144 */ 89 u32 padding_4[8]; /* [0x148..0x164] */ 90 u32 rd_ch0_pwr_en; /* 0x168 */ 91 u32 rd_ch1_pwr_en; /* 0x16c */ 92 u32 rd_ch2_pwr_en; /* 0x170 */ 93 u32 rd_ch3_pwr_en; /* 0x174 */ 94 u32 rd_ch4_pwr_en; /* 0x178 */ 95 u32 rd_ch5_pwr_en; /* 0x18c */ 96 u32 rd_ch6_pwr_en; /* 0x180 */ 97 u32 rd_ch7_pwr_en; /* 0x184 */ 98 u32 padding_5[30]; /* [0x188..0x1fc] */ 99 struct dw_edma_v0_ch ch[EDMA_V0_MAX_NR_CH]; /* [0x200..0x1120] */ 100 } __packed; 101 102 struct dw_edma_v0_legacy { 103 u32 viewport_sel; /* 0x0f8 */ 104 struct dw_edma_v0_ch_regs ch; /* [0x100..0x120] */ 105 } __packed; 106 107 struct dw_edma_v0_regs { 108 /* eDMA global registers */ 109 u32 ctrl_data_arb_prior; /* 0x000 */ 110 u32 padding_1; /* 0x004 */ 111 u32 ctrl; /* 0x008 */ 112 u32 wr_engine_en; /* 0x00c */ 113 u32 wr_doorbell; /* 0x010 */ 114 u32 padding_2; /* 0x014 */ 115 union { 116 u64 reg; /* 0x018..0x01c */ 117 struct { 118 u32 lsb; /* 0x018 */ 119 u32 msb; /* 0x01c */ 120 }; 121 } wr_ch_arb_weight; 122 u32 padding_3[3]; /* [0x020..0x028] */ 123 u32 rd_engine_en; /* 0x02c */ 124 u32 rd_doorbell; /* 0x030 */ 125 u32 padding_4; /* 0x034 */ 126 union { 127 u64 reg; /* 0x038..0x03c */ 128 struct { 129 u32 lsb; /* 0x038 */ 130 u32 msb; /* 0x03c */ 131 }; 132 } rd_ch_arb_weight; 133 u32 padding_5[3]; /* [0x040..0x048] */ 134 /* eDMA interrupts registers */ 135 u32 wr_int_status; /* 0x04c */ 136 u32 padding_6; /* 0x050 */ 137 u32 wr_int_mask; /* 0x054 */ 138 u32 wr_int_clear; /* 0x058 */ 139 u32 wr_err_status; /* 0x05c */ 140 union { 141 u64 reg; /* 0x060..0x064 */ 142 struct { 143 u32 lsb; /* 0x060 */ 144 u32 msb; /* 0x064 */ 145 }; 146 } wr_done_imwr; 147 union { 148 u64 reg; /* 0x068..0x06c */ 149 struct { 150 u32 lsb; /* 0x068 */ 151 u32 msb; /* 0x06c */ 152 }; 153 } wr_abort_imwr; 154 u32 wr_ch01_imwr_data; /* 0x070 */ 155 u32 wr_ch23_imwr_data; /* 0x074 */ 156 u32 wr_ch45_imwr_data; /* 0x078 */ 157 u32 wr_ch67_imwr_data; /* 0x07c */ 158 u32 padding_7[4]; /* [0x080..0x08c] */ 159 u32 wr_linked_list_err_en; /* 0x090 */ 160 u32 padding_8[3]; /* [0x094..0x09c] */ 161 u32 rd_int_status; /* 0x0a0 */ 162 u32 padding_9; /* 0x0a4 */ 163 u32 rd_int_mask; /* 0x0a8 */ 164 u32 rd_int_clear; /* 0x0ac */ 165 u32 padding_10; /* 0x0b0 */ 166 union { 167 u64 reg; /* 0x0b4..0x0b8 */ 168 struct { 169 u32 lsb; /* 0x0b4 */ 170 u32 msb; /* 0x0b8 */ 171 }; 173 u32 padding_11[2]; /* [0x0bc..0x0c0] */ 174 u32 rd_linked_list_err_en; /* 0x0c4 */ 175 u32 padding_12; /* 0x0c8 */ 176 union { 177 u64 reg; /* 0x0cc..0x0d0 */ 178 struct { 179 u32 lsb; /* 0x0cc */ 180 u32 msb; /* 0x0d0 */ 181 }; 183 union { 184 u64 reg; /* 0x0d4..0x0d8 */ 185 struct { 186 u32 lsb; /* 0x0d4 */ 187 u32 msb; /* 0x0d8 */ 188 }; 190 u32 rd_ch01_imwr_data; /* 0x0dc */ 191 u32 rd_ch23_imwr_data; /* 0x0e0 */ 192 u32 rd_ch45_imwr_data; /* 0x0e4 */ 193 u32 rd_ch67_imwr_data; /* 0x0e8 */ 194 u32 padding_13[4]; /* [0x0ec..0x0f8] */ 195 /* eDMA channel context grouping */ 196 union dw_edma_v0_type { 197 struct dw_edma_v0_legacy legacy; /* [0x0f8..0x120] */ 198 struct dw_edma_v0_unroll unroll; /* [0x0f8..0x1120] */ 199 } type; 200 } __packed; 201 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org