linux-kernel - [tobetter:odroid-5.18.y 97/131] drivers/pwm/pwm-gpio.c:60:22: warning: no previous prototype for 'gpio_pwm

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Date:   Tue, 17 May 2022 01:24:50 +0800
From:   kernel test robot <lkp@...el.com>
To:     Kevin Kim <ckkim@...dkernel.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Dongjin Kim <tobetter@...il.com>,
        Olliver Schinagl <oliver@...inagl.nl>
Subject: [tobetter:odroid-5.18.y 97/131] drivers/pwm/pwm-gpio.c:60:22:
 warning: no previous prototype for 'gpio_pwm_timer'

tree:   https://github.com/tobetter/linux odroid-5.18.y
head:   a4a3b755d6825af3be1a233d3d927f40356ff545
commit: 523b4a5fc40c035f7fb9cc079b1f0a9ba38f16d8 [97/131] ODROID-COMMON: pwm: gpio: Add a generic gpio based PWM driver
config: m68k-allmodconfig (https://download.01.org/0day-ci/archive/20220517/202205170132.c95JkC0F-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 11.3.0
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/523b4a5fc40c035f7fb9cc079b1f0a9ba38f16d8
        git remote add tobetter https://github.com/tobetter/linux
        git fetch --no-tags tobetter odroid-5.18.y
        git checkout 523b4a5fc40c035f7fb9cc079b1f0a9ba38f16d8
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash drivers/pwm/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.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	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp