Hi Meghana, [auto build test ERROR on drm/drm-next] [also build test ERROR on v4.14-rc3 next-20170929] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Meghana-Madhyastha/drm-tinydrm-drm_of_find_backlight-helper/20171003-011920 base: git://people.freedesktop.org/~airlied/linux.git drm-next config: arm-sunxi_defconfig (attached as .config) compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=arm All errors (new ones prefixed by >>): drivers/gpu/drm/drm_of.c:283:26: error: redefinition of 'drm_of_find_backlight' struct backlight_device *drm_of_find_backlight(struct device *dev) ^~~~~~~~~~~~~~~~~~~~~ In file included from drivers/gpu/drm/drm_of.c:4:0: include/linux/backlight.h:181:1: note: previous definition of 'drm_of_find_backlight' was here drm_of_find_backlight(struct device *dev) ^~~~~~~~~~~~~~~~~~~~~ >> drivers/gpu/drm/drm_of.c:328:26: error: redefinition of 'devm_drm_of_find_backlight' struct backlight_device *devm_drm_of_find_backlight(struct device *dev) ^~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/gpu/drm/drm_of.c:4:0: include/linux/backlight.h:187:1: note: previous definition of 'devm_drm_of_find_backlight' was here devm_drm_of_find_backlight(struct device *dev) ^~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/devm_drm_of_find_backlight +328 drivers/gpu/drm/drm_of.c 264 265 /** 266 * drm_of_find_backlight - Find backlight device in device-tree 267 * @dev: Device 268 * 269 * This function looks for a DT node pointed to by a property named 'backlight' 270 * and uses of_find_backlight_by_node() to get the backlight device. 271 * Additionally if the brightness property is zero, it is set to 272 * max_brightness. 273 * 274 * Note: It is the responsibility of the caller to call put_device() when 275 * releasing the resource. 276 * 277 * Returns: 278 * NULL if there's no backlight property. 279 * Error pointer -EPROBE_DEFER if the DT node is found, but no backlight device 280 * is found. 281 * If the backlight device is found, a pointer to the structure is returned. 282 */ > 283 struct backlight_device *drm_of_find_backlight(struct device *dev) 284 { 285 struct backlight_device *backlight; 286 struct device_node *np; 287 288 np = of_parse_phandle(dev->of_node, "backlight", 0); 289 if (!np) 290 return NULL; 291 292 backlight = of_find_backlight_by_node(np); 293 of_node_put(np); 294 295 if (!backlight) 296 return ERR_PTR(-EPROBE_DEFER); 297 298 if (!backlight->props.brightness) { 299 backlight->props.brightness = backlight->props.max_brightness; 300 DRM_DEBUG_KMS("Backlight brightness set to %d\n", 301 backlight->props.brightness); 302 } 303 304 return backlight; 305 } 306 EXPORT_SYMBOL(drm_of_find_backlight); 307 308 static void devm_drm_of_find_backlight_release(void *data) 309 { 310 put_device(data); 311 } 312 313 /** 314 * devm_drm_of_find_backlight - Find backlight device in device-tree 315 * devres version of the function 316 * @dev: Device 317 * 318 * This is the devres version of the function drm_of_find_backlight. 319 * Some drivers use devres versions of functions for 320 * requiring device resources. 321 * 322 * Returns: 323 * NULL if there's no backlight property. 324 * Error pointer -EPROBE_DEFER if the DT node is found, but no backlight device 325 * is found. 326 * If the backlight device is found, a pointer to the structure is returned. 327 */ > 328 struct backlight_device *devm_drm_of_find_backlight(struct device *dev) --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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