tree: https://github.com/tobetter/linux odroid-5.17.y head: 992855288ffabfafb16c8ed7ce9a81fc64cfc89a commit: 380f2027a31094e1f64a78ce0e424f02dea66bc7 [7/41] ODROID-COMMON: pwm: gpio: Add a generic gpio based PWM driver config: hexagon-allyesconfig (https://download.01.org/0day-ci/archive/20220216/202202160144.hjSHJs2v-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 37f422f4ac31c8b8041c6b62065263314282dab6) 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 # https://github.com/tobetter/linux/commit/380f2027a31094e1f64a78ce0e424f02... git remote add tobetter https://github.com/tobetter/linux git fetch --no-tags tobetter odroid-5.17.y git checkout 380f2027a31094e1f64a78ce0e424f02dea66bc7 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/pwm/ 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 >>): enum hrtimer_restart gpio_pwm_timer(struct hrtimer *timer) ^ drivers/pwm/pwm-gpio.c:60:1: note: declare 'static' if the function is not intended to be used outside of this translation unit enum hrtimer_restart gpio_pwm_timer(struct hrtimer *timer) ^ static 1 warning generated. vim +/gpio_pwm_timer +60 drivers/pwm/pwm-gpio.c 59 61 { 62 struct gpio_pwm_data *gpio_data = container_of(timer, 63 struct gpio_pwm_data, 64 timer); 65 if (!gpio_data->run) { 66 gpio_pwm_off(gpio_data); 67 gpio_data->pin_on = false; 68 return HRTIMER_NORESTART; 69 } 70 71 if (!gpio_data->pin_on) { 72 hrtimer_forward_now(&gpio_data->timer, 73 ns_to_ktime(gpio_data->on_time)); 74 gpio_pwm_on(gpio_data); 75 gpio_data->pin_on = true; 76 } else { 77 hrtimer_forward_now(&gpio_data->timer, 78 ns_to_ktime(gpio_data->off_time)); 79 gpio_pwm_off(gpio_data); 80 gpio_data->pin_on = false; 81 } 82 83 return HRTIMER_RESTART; 84 } 85 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org