Hi Yingchao, kernel test robot noticed the following build warnings:
[auto build test WARNING on atorgue-stm32/stm32-next] [also build test WARNING on linus/master v6.18-rc2 next-20251022] [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#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Yingchao-Deng/stm-class-Add-MIPI-OST-protocol-support/20251022-152642 base: https://git.kernel.org/pub/scm/linux/kernel/git/atorgue/stm32.git stm32-next patch link: https://lore.kernel.org/r/20251022071834.1658684-1-yingchao.deng%40oss.qualcomm.com patch subject: [PATCH v3] stm: class: Add MIPI OST protocol support config: x86_64-randconfig-071-20251023 (https://download.01.org/0day-ci/archive/20251023/[email protected]/config) compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251023/[email protected]/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <[email protected]> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/ All warnings (new ones prefixed by >>): >> drivers/hwtracing/stm/p_ost.c:172:6: warning: unused variable 'i' >> [-Wunused-variable] 172 | int i; | ^ 1 warning generated. vim +/i +172 drivers/hwtracing/stm/p_ost.c 154 155 static ssize_t 156 notrace ost_write(struct stm_data *data, struct stm_output *output, 157 unsigned int chan, const char *buf, size_t count, 158 struct stm_source_data *source) 159 { 160 unsigned int c = output->channel + chan; 161 unsigned int m = output->master; 162 const unsigned char nil = 0; 163 u32 header = DATA_HEADER; 164 struct trc_hdr { 165 u16 version; 166 u16 magic; 167 u32 cpu; 168 u64 timestamp; 169 u64 tgid; 170 } hdr; 171 ssize_t sz; > 172 int i; 173 struct ost_output *op = output->pdrv_private; 174 175 /* 176 * Identify the source by entity type. 177 * If entity type is not set, return error value. 178 */ 179 if (op->node.entity_type) 180 header |= ost_entity_value[op->node.entity_type]; 181 else 182 return -EINVAL; 183 184 /* 185 * STP framing rules for OST frames: 186 * * the first packet of the OST frame is marked; 187 * * the last packet is a FLAG with timestamped tag. 188 */ 189 /* Message layout: HEADER / DATA / TAIL */ 190 /* HEADER */ 191 sz = data->packet(data, m, c, STP_PACKET_DATA, STP_PACKET_MARKED, 192 4, (u8 *)&header); 193 if (sz <= 0) 194 return sz; 195 196 /* DATA */ 197 hdr.version = STM_MAKE_VERSION(0, 3); 198 hdr.magic = STM_HEADER_MAGIC; 199 hdr.cpu = raw_smp_processor_id(); 200 hdr.timestamp = sched_clock(); 201 hdr.tgid = task_tgid_nr(current); 202 sz = stm_data_write(data, m, c, false, &hdr, sizeof(hdr)); 203 if (sz <= 0) 204 return sz; 205 206 sz = stm_data_write(data, m, c, false, buf, count); 207 208 /* TAIL */ 209 if (sz > 0) 210 data->packet(data, m, c, STP_PACKET_FLAG, 211 STP_PACKET_TIMESTAMPED, 0, &nil); 212 213 return sz; 214 } 215 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
