drivers/pwm/pwm-gpio.c:60:22: warning: no previous prototype for 'gpio_pwm_timer'

[kernel test robot <lkp@intel.com>]

tree:   https://github.com/tobetter/linux odroid-5.19.y
head:   0569e1291a824471ea27c9e90132881c0232a3a0
commit: e76d6cf1a5ecd46156c2dc716f5acfba766156f6 ODROID-COMMON: pwm: gpio: Add a generic gpio based PWM driver
date:   8 days ago
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20220719/202207192231.Py9az5ky-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/tobetter/linux/commit/e76d6cf1a5ecd46156c2dc716f5acfba766156f6
        git remote add tobetter https://github.com/tobetter/linux
        git fetch --no-tags tobetter odroid-5.19.y
        git checkout e76d6cf1a5ecd46156c2dc716f5acfba766156f6
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/pwm/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/pwm/pwm-gpio.c:60:22: warning: no previous prototype for 'gpio_pwm_timer' [-Wmissing-prototypes]
      60 | enum hrtimer_restart gpio_pwm_timer(struct hrtimer *timer)
         |                      ^~~~~~~~~~~~~~


vim +/gpio_pwm_timer +60 drivers/pwm/pwm-gpio.c

    59	
  > 60	enum hrtimer_restart gpio_pwm_timer(struct hrtimer *timer)
    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	

-- 
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