Hi Mauro, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 494d311a82bb06a81fa7ef4277367701a792e6ef commit: 1747938a37d1dfa9faa397507f88627158b3d806 [1981/2764] staging: spmi: hisi-spmi-controller: add it to the building system config: powerpc-randconfig-r003-20200824 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project b587ca93be114d07ec3bf654add97d7872325281) 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 powerpc cross compiling tool for clang build # apt-get install binutils-powerpc-linux-gnu git checkout 1747938a37d1dfa9faa397507f88627158b3d806 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 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 >>): SPMI_CONTROLLER_MAX_TRANS_BYTES, bc); ^~ include/linux/dev_printk.h:104:32: note: expanded from macro 'dev_err' _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ opc, sid, addr, bc + 1); ^~~~~~ include/linux/dev_printk.h:104:32: note: expanded from macro 'dev_err' _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ drivers/staging/hikey9xx/hisi-spmi-controller.c:221:37: warning: format specifies type 'long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat] SPMI_CONTROLLER_MAX_TRANS_BYTES, bc); ^~ include/linux/dev_printk.h:104:32: note: expanded from macro 'dev_err' _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ drivers/staging/hikey9xx/hisi-spmi-controller.c:271:20: warning: format specifies type 'long' but the argument has type 'size_t' (aka 'unsigned int') [-Wformat] opc, sid, addr, bc); ^~ include/linux/dev_printk.h:104:32: note: expanded from macro 'dev_err' _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ 4 warnings generated. # 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 1747938a37d1dfa9faa397507f88627158b3d806 vim +149 drivers/staging/hikey9xx/hisi-spmi-controller.c 70f59c90c8199e Mayulong 2020-08-17 134 70f59c90c8199e Mayulong 2020-08-17 135 static int spmi_read_cmd(struct spmi_controller *ctrl, 6af364501949d9 Mauro Carvalho Chehab 2020-08-17 136 u8 opc, u8 sid, u16 addr, u8 *__buf, size_t bc) 70f59c90c8199e Mayulong 2020-08-17 137 { 70f59c90c8199e Mayulong 2020-08-17 138 struct spmi_controller_dev *spmi_controller = dev_get_drvdata(&ctrl->dev); 70f59c90c8199e Mayulong 2020-08-17 139 unsigned long flags; 6af364501949d9 Mauro Carvalho Chehab 2020-08-17 140 u8 *buf = __buf; 70f59c90c8199e Mayulong 2020-08-17 141 u32 cmd, data; 70f59c90c8199e Mayulong 2020-08-17 142 int rc; 70f59c90c8199e Mayulong 2020-08-17 143 u32 chnl_ofst = SPMI_CHANNEL_OFFSET * spmi_controller->channel; 70f59c90c8199e Mayulong 2020-08-17 144 u8 op_code, i; 70f59c90c8199e Mayulong 2020-08-17 145 70f59c90c8199e Mayulong 2020-08-17 146 if (bc > SPMI_CONTROLLER_MAX_TRANS_BYTES) { 4d914a8c480c31 Mauro Carvalho Chehab 2020-08-17 147 dev_err(&ctrl->dev, 4d914a8c480c31 Mauro Carvalho Chehab 2020-08-17 148 "spmi_controller supports 1..%d bytes per trans, but:%ld requested", 4d914a8c480c31 Mauro Carvalho Chehab 2020-08-17 @149 SPMI_CONTROLLER_MAX_TRANS_BYTES, bc); 70f59c90c8199e Mayulong 2020-08-17 150 return -EINVAL; 70f59c90c8199e Mayulong 2020-08-17 151 } 70f59c90c8199e Mayulong 2020-08-17 152 70f59c90c8199e Mayulong 2020-08-17 153 /* Check the opcode */ 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 154 if (opc == SPMI_CMD_READ) { 70f59c90c8199e Mayulong 2020-08-17 155 op_code = SPMI_CMD_REG_READ; 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 156 } else if (opc == SPMI_CMD_EXT_READ) { 70f59c90c8199e Mayulong 2020-08-17 157 op_code = SPMI_CMD_EXT_REG_READ; 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 158 } else if (opc == SPMI_CMD_EXT_READL) { 70f59c90c8199e Mayulong 2020-08-17 159 op_code = SPMI_CMD_EXT_REG_READ_L; 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 160 } else { 4d914a8c480c31 Mauro Carvalho Chehab 2020-08-17 161 dev_err(&ctrl->dev, "invalid read cmd 0x%x", opc); 70f59c90c8199e Mayulong 2020-08-17 162 return -EINVAL; 70f59c90c8199e Mayulong 2020-08-17 163 } 70f59c90c8199e Mayulong 2020-08-17 164 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 165 cmd = SPMI_APB_SPMI_CMD_EN | 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 166 (op_code << SPMI_APB_SPMI_CMD_TYPE_OFFSET) | 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 167 ((bc - 1) << SPMI_APB_SPMI_CMD_LENGTH_OFFSET) | 70f59c90c8199e Mayulong 2020-08-17 168 ((sid & 0xf) << SPMI_APB_SPMI_CMD_SLAVEID_OFFSET) | /* slvid */ 70f59c90c8199e Mayulong 2020-08-17 169 ((addr & 0xffff) << SPMI_APB_SPMI_CMD_ADDR_OFFSET); /* slave_addr */ 70f59c90c8199e Mayulong 2020-08-17 170 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 171 spin_lock_irqsave(&spmi_controller->lock, flags); 70f59c90c8199e Mayulong 2020-08-17 172 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 173 writel(cmd, spmi_controller->base + chnl_ofst + SPMI_APB_SPMI_CMD_BASE_ADDR); 70f59c90c8199e Mayulong 2020-08-17 174 4d914a8c480c31 Mauro Carvalho Chehab 2020-08-17 175 rc = spmi_controller_wait_for_done(&ctrl->dev, spmi_controller, 8788a30c12c788 Mauro Carvalho Chehab 2020-08-17 176 spmi_controller->base, sid, addr); 70f59c90c8199e Mayulong 2020-08-17 177 if (rc) 70f59c90c8199e Mayulong 2020-08-17 178 goto done; 70f59c90c8199e Mayulong 2020-08-17 179 70f59c90c8199e Mayulong 2020-08-17 180 i = 0; 70f59c90c8199e Mayulong 2020-08-17 181 do { 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 182 data = readl(spmi_controller->base + chnl_ofst + SPMI_SLAVE_OFFSET * sid + SPMI_APB_SPMI_RDATA0_BASE_ADDR + i * SPMI_PER_DATAREG_BYTE); 8788a30c12c788 Mauro Carvalho Chehab 2020-08-17 183 data = be32_to_cpu((__be32)data); 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 184 if ((bc - i * SPMI_PER_DATAREG_BYTE) >> 2) { 70f59c90c8199e Mayulong 2020-08-17 185 memcpy(buf, &data, sizeof(data)); 70f59c90c8199e Mayulong 2020-08-17 186 buf += sizeof(data); 70f59c90c8199e Mayulong 2020-08-17 187 } else { 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 188 memcpy(buf, &data, bc % SPMI_PER_DATAREG_BYTE); 70f59c90c8199e Mayulong 2020-08-17 189 buf += (bc % SPMI_PER_DATAREG_BYTE); 70f59c90c8199e Mayulong 2020-08-17 190 } 70f59c90c8199e Mayulong 2020-08-17 191 i++; 70f59c90c8199e Mayulong 2020-08-17 192 } while (bc > i * SPMI_PER_DATAREG_BYTE); 70f59c90c8199e Mayulong 2020-08-17 193 70f59c90c8199e Mayulong 2020-08-17 194 done: 70f59c90c8199e Mayulong 2020-08-17 195 spin_unlock_irqrestore(&spmi_controller->lock, flags); 70f59c90c8199e Mayulong 2020-08-17 196 if (rc) 4d914a8c480c31 Mauro Carvalho Chehab 2020-08-17 197 dev_err(&ctrl->dev, 4d914a8c480c31 Mauro Carvalho Chehab 2020-08-17 198 "spmi read wait timeout op:0x%x sid:%d addr:0x%x bc:%ld\n", 70f59c90c8199e Mayulong 2020-08-17 @199 opc, sid, addr, bc + 1); 6af364501949d9 Mauro Carvalho Chehab 2020-08-17 200 else 4d914a8c480c31 Mauro Carvalho Chehab 2020-08-17 201 dev_dbg(&ctrl->dev, "%s: id:%d addr:0x%x, read value: %*ph\n", 6af364501949d9 Mauro Carvalho Chehab 2020-08-17 202 __func__, sid, addr, (int)bc, __buf); 6af364501949d9 Mauro Carvalho Chehab 2020-08-17 203 70f59c90c8199e Mayulong 2020-08-17 204 return rc; 2ea3f6a03b155f Mauro Carvalho Chehab 2020-08-17 205 } 70f59c90c8199e Mayulong 2020-08-17 206 :::::: The code at line 149 was first introduced by commit :::::: 4d914a8c480c31280505304611030612fa5c2645 staging: spmi: hisi-spmi-controller: fix the dev_foo() logic :::::: TO: Mauro Carvalho Chehab <mchehab+huawei(a)kernel.org&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org