Hi jaap, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on hwmon/hwmon-next] [also build test WARNING on v5.8-rc5 next-20200717] [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] url: https://github.com/0day-ci/linux/commits/jaap-aarts/hwmon-add-fan-pwm-dri... base: https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next config: x86_64-allyesconfig (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ed6b578040a85977026c93bf4188f996148f3218) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 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 >>): int set_fan_pwm_curve(struct hydro_i_pro_device *hdev, ^ drivers/hwmon/corsair_hydro_i_pro.c:175:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int set_fan_pwm_curve(struct hydro_i_pro_device *hdev, ^ static int set_fan_target_rpm(struct hydro_i_pro_device *hdev, ^ drivers/hwmon/corsair_hydro_i_pro.c:222:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int set_fan_target_rpm(struct hydro_i_pro_device *hdev, ^ static int get_fan_current_rpm(struct hydro_i_pro_device *hdev, ^ drivers/hwmon/corsair_hydro_i_pro.c:258:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int get_fan_current_rpm(struct hydro_i_pro_device *hdev, ^ static int set_fan_target_pwm(struct hydro_i_pro_device *hdev, ^ drivers/hwmon/corsair_hydro_i_pro.c:292:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int set_fan_target_pwm(struct hydro_i_pro_device *hdev, ^ static umode_t hwmon_is_visible(const void *d, enum hwmon_sensor_types type, u32 attr, ^ drivers/hwmon/corsair_hydro_i_pro.c:327:1: note: declare 'static' if the function is not intended to be used outside of this translation unit umode_t hwmon_is_visible(const void *d, enum hwmon_sensor_types type, u32 attr, ^ static int hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, ^ drivers/hwmon/corsair_hydro_i_pro.c:481:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, ^ static bool does_fan_exist(struct hydro_i_pro_device *hdev, int channel) ^ drivers/hwmon/corsair_hydro_i_pro.c:561:1: note: declare 'static' if the function is not intended to be used outside of this translation unit bool does_fan_exist(struct hydro_i_pro_device *hdev, int channel) ^ static int get_fan_count(struct hydro_i_pro_device *hdev) ^ drivers/hwmon/corsair_hydro_i_pro.c:589:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int get_fan_count(struct hydro_i_pro_device *hdev) ^ static void hwmon_init(struct hydro_i_pro_device *hdev) ^ drivers/hwmon/corsair_hydro_i_pro.c:598:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void hwmon_init(struct hydro_i_pro_device *hdev) ^ static int init_device(struct usb_device *udev) ^ drivers/hwmon/corsair_hydro_i_pro.c:671:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int init_device(struct usb_device *udev) ^ static int deinit_device(struct usb_device *udev) ^ drivers/hwmon/corsair_hydro_i_pro.c:688:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int deinit_device(struct usb_device *udev) ^ static static const char SUCCESS[SUCCES_LENGTH - 1] = { 0x12, 0x34 }; ^ 12 warnings generated. vim +/set_fan_pwm_curve +175 drivers/hwmon/corsair_hydro_i_pro.c 163 164 #define SUCCES_LENGTH 3 165 #define SUCCES_CODE (0x12, 0x34) 167 168 static bool check_succes(enum opcodes command, char ret[SUCCES_LENGTH]) 169 { 170 char success[SUCCES_LENGTH] = { command, SUCCES_CODE }; 171 172 return strncmp(ret, success, SUCCES_LENGTH) == 0; 173 } 174 176 struct hwmon_fan_data *fan_data, 177 struct curve_point point[7]) 178 { 179 int retval; 180 int wrote; 181 int sndpipe = usb_sndbulkpipe(hdev->udev, hdev->bulk_out_endpointAddr); 182 int rcvpipe = usb_rcvbulkpipe(hdev->udev, hdev->bulk_in_endpointAddr); 183 unsigned char *send_buf = hdev->bulk_out_buffer; 184 unsigned char *recv_buf = hdev->bulk_in_buffer; 185 186 memcpy(fan_data->curve, point, sizeof(fan_data->curve)); 187 188 send_buf[0] = PWM_FAN_CURVE_CMD; 189 send_buf[1] = fan_data->fan_channel; 190 send_buf[2] = point[0].temp; 191 send_buf[3] = point[1].temp; 192 send_buf[4] = point[2].temp; 193 send_buf[5] = point[3].temp; 194 send_buf[6] = point[4].temp; 195 send_buf[7] = point[5].temp; 196 send_buf[8] = point[6].temp; 197 send_buf[9] = point[0].pwm; 198 send_buf[10] = point[1].pwm; 199 send_buf[11] = point[2].pwm; 200 send_buf[12] = point[3].pwm; 201 send_buf[13] = point[4].pwm; 202 send_buf[14] = point[5].pwm; 203 send_buf[15] = point[6].pwm; 204 205 retval = usb_bulk_msg(hdev->udev, sndpipe, send_buf, 16, &wrote, 100); 206 if (retval != 0) 207 return retval; 208 209 retval = usb_bulk_msg(hdev->udev, rcvpipe, recv_buf, 4, &wrote, 100); 210 if (retval != 0) 211 return retval; 212 213 if (!check_succes(send_buf[0], recv_buf)) { 214 dev_info(&hdev->udev->dev, 215 "[*] failed setting fan curve %d,%d,%d/%d\n", 216 recv_buf[0], recv_buf[1], recv_buf[2], recv_buf[3]); 217 return -EINVAL; 218 } 219 return 0; 220 } 221 223 struct hwmon_fan_data *fan_data, long val) 224 { 225 int retval; 226 int wrote; 227 int sndpipe = usb_sndbulkpipe(hdev->udev, hdev->bulk_out_endpointAddr); 228 int rcvpipe = usb_rcvbulkpipe(hdev->udev, hdev->bulk_in_endpointAddr); 229 230 unsigned char *send_buf = hdev->bulk_out_buffer; 231 unsigned char *recv_buf = hdev->bulk_in_buffer; 232 233 fan_data->fan_target = val; 234 fan_data->fan_pwm_target = 0; 235 236 send_buf[0] = RPM_FAN_TARGET_CMD; 237 send_buf[1] = fan_data->fan_channel; 238 send_buf[2] = (fan_data->fan_target >> 8); 239 send_buf[3] = fan_data->fan_target; 240 241 retval = usb_bulk_msg(hdev->udev, sndpipe, send_buf, 4, &wrote, 100); 242 if (retval != 0) 243 return retval; 244 245 retval = usb_bulk_msg(hdev->udev, rcvpipe, recv_buf, 6, &wrote, 100); 246 if (retval != 0) 247 return retval; 248 249 if (!check_succes(send_buf[0], recv_buf)) { 250 dev_info(&hdev->udev->dev, 251 "[*] failed setting fan rpm %d,%d,%d/%d\n", 252 recv_buf[0], recv_buf[1], recv_buf[2], recv_buf[3]); 253 return -EINVAL; 254 } 255 return 0; 256 } 257 259 struct hwmon_fan_data *fan_data, long *val) 260 { 261 int retval; 262 int wrote; 263 int sndpipe = usb_sndbulkpipe(hdev->udev, hdev->bulk_out_endpointAddr); 264 int rcvpipe = usb_rcvbulkpipe(hdev->udev, hdev->bulk_in_endpointAddr); 265 266 unsigned char *send_buf = hdev->bulk_out_buffer; 267 unsigned char *recv_buf = hdev->bulk_in_buffer; 268 269 send_buf[0] = PWM_GET_CURRENT_CMD; 270 send_buf[1] = fan_data->fan_channel; 271 272 retval = usb_bulk_msg(hdev->udev, sndpipe, send_buf, 2, &wrote, 100); 273 if (retval != 0) 274 return retval; 275 276 retval = usb_bulk_msg(hdev->udev, rcvpipe, recv_buf, 6, &wrote, 100); 277 if (retval != 0) 278 return retval; 279 280 if (!check_succes(send_buf[0], recv_buf) || 281 recv_buf[3] != fan_data->fan_channel) { 282 dev_info(&hdev->udev->dev, 283 "[*] failed retrieving fan rmp %d,%d,%d/%d\n", 284 recv_buf[0], recv_buf[1], recv_buf[2], recv_buf[3]); 285 return -EINVAL; 286 } 287 288 *val = ((recv_buf[4]) << 8) + recv_buf[5]; 289 return 0; 290 } 291 293 struct hwmon_fan_data *fan_data, long val) 294 { 295 int retval; 296 int wrote; 297 int sndpipe = usb_sndbulkpipe(hdev->udev, hdev->bulk_out_endpointAddr); 298 int rcvpipe = usb_rcvbulkpipe(hdev->udev, hdev->bulk_in_endpointAddr); 299 300 unsigned char *send_buf = hdev->bulk_out_buffer; 301 unsigned char *recv_buf = hdev->bulk_in_buffer; 302 303 fan_data->fan_pwm_target = val; 304 fan_data->fan_target = 0; 305 306 send_buf[0] = PWM_FAN_TARGET_CMD; 307 send_buf[1] = fan_data->fan_channel; 308 send_buf[3] = fan_data->fan_pwm_target; 309 310 retval = usb_bulk_msg(hdev->udev, sndpipe, send_buf, 4, &wrote, 100); 311 if (retval != 0) 312 return retval; 313 314 retval = usb_bulk_msg(hdev->udev, rcvpipe, recv_buf, 6, &wrote, 100000); 315 if (retval != 0) 316 return retval; 317 318 if (!check_succes(send_buf[0], recv_buf)) { 319 dev_info(&hdev->udev->dev, 320 "[*] failed setting fan pwm %d,%d,%d/%d\n", 321 recv_buf[0], recv_buf[1], recv_buf[2], recv_buf[3]); 322 return -EINVAL; 323 } 324 return 0; 325 } 326 328 int channel) 329 { 330 switch (type) { 331 case hwmon_fan: 332 switch (attr) { 333 case hwmon_fan_input: 334 return 0444; 335 break; 336 case hwmon_fan_target: 337 return 0644; 338 break; 339 case hwmon_fan_min: 340 return 0444; 341 break; 342 default: 343 break; 344 } 345 break; 346 case hwmon_pwm: 347 switch (attr) { 348 case hwmon_pwm_input: 349 return 0200; 350 break; 351 case hwmon_pwm_enable: 352 return 0644; 353 break; 354 default: 355 break; 356 } 357 break; 358 default: 359 break; 360 } 361 return 0; 362 } 363 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org