Hi Yauhen, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: db10f126048021b86e43a5d6a335ec49dec10155 commit: 047da762b9a937d60c16e2c8392c326e5ab11a1d [4146/8065] leds: Add Intel Cherry Trail Whiskey Cove PMIC LED driver config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20230608/202306082341.UQtCM8PO-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=047da762b9a937d60c16e2c8392c326e5ab11a1d 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 047da762b9a937d60c16e2c8392c326e5ab11a1d # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=x86_64 olddefconfig make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/leds/ 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 <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202306082341.UQtCM8PO-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> drivers/leds/leds-cht-wcove.c:142:21: warning: no previous prototype for 'cht_wc_leds_brightness_get' [-Wmissing-prototypes] 142 | enum led_brightness cht_wc_leds_brightness_get(struct led_classdev *cdev) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/cht_wc_leds_brightness_get +142 drivers/leds/leds-cht-wcove.c 141 > 142 enum led_brightness cht_wc_leds_brightness_get(struct led_classdev *cdev) 143 { 144 struct cht_wc_led *led = container_of(cdev, struct cht_wc_led, cdev); 145 unsigned int val; 146 int ret; 147 148 mutex_lock(&led->mutex); 149 150 ret = regmap_read(led->regmap, led->regs->ctrl, &val); 151 if (ret < 0) { 152 dev_err(cdev->dev, "Failed to read LED CTRL reg: %d\n", ret); 153 ret = 0; 154 goto done; 155 } 156 157 val &= led->regs->on_off_mask; 158 if (val != led->regs->on_val) { 159 ret = 0; 160 goto done; 161 } 162 163 ret = regmap_read(led->regmap, led->regs->pwm, &val); 164 if (ret < 0) { 165 dev_err(cdev->dev, "Failed to read LED PWM reg: %d\n", ret); 166 ret = 0; 167 goto done; 168 } 169 170 ret = val; 171 done: 172 mutex_unlock(&led->mutex); 173 174 return ret; 175 } 176 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
