Re: [PATCH] hwmon: constify struct hwmon_chip_info info member harder

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

Hi Jani,

I love your patch! Perhaps something to improve:

[auto build test WARNING on groeck-staging/hwmon-next]
[also build test WARNING on linus/master v6.3-rc1 next-20230309]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Jani-Nikula/hwmon-constify-struct-hwmon_chip_info-info-member-harder/20230309-163328
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
patch link:    https://lore.kernel.org/r/20230309082841.400118-1-jani.nikula%40intel.com
patch subject: [PATCH] hwmon: constify struct hwmon_chip_info info member harder
config: x86_64-randconfig-a011 (https://download.01.org/0day-ci/archive/20230309/202303091901.0BoQeZI2-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/1ec9eaf0281f0a40044492700b7cdfe99d35d35e
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jani-Nikula/hwmon-constify-struct-hwmon_chip_info-info-member-harder/20230309-163328
        git checkout 1ec9eaf0281f0a40044492700b7cdfe99d35d35e
        # 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/hwmon/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202303091901.0BoQeZI2-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/hwmon/hwmon.c: In function 'hwmon_thermal_set_trips':
>> drivers/hwmon/hwmon.c:177:50: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     177 |         const struct hwmon_channel_info **info = chip->info;
         |                                                  ^~~~
   drivers/hwmon/hwmon.c: In function 'hwmon_thermal_register_sensors':
   drivers/hwmon/hwmon.c:256:50: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     256 |         const struct hwmon_channel_info **info = chip->info;
         |                                                  ^~~~


vim +/const +177 drivers/hwmon/hwmon.c

d560168b5d0fb4a Guenter Roeck   2015-08-26  171  
e5181331359d931 Daniel Lezcano  2022-08-05  172  static int hwmon_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  173  {
e5181331359d931 Daniel Lezcano  2022-08-05  174  	struct hwmon_thermal_data *tdata = tz->devdata;
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  175  	struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  176  	const struct hwmon_chip_info *chip = hwdev->chip;
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23 @177  	const struct hwmon_channel_info **info = chip->info;
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  178  	unsigned int i;
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  179  	int err;
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  180  
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  181  	if (!chip->ops->write)
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  182  		return 0;
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  183  
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  184  	for (i = 0; info[i] && info[i]->type != hwmon_temp; i++)
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  185  		continue;
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  186  
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  187  	if (!info[i])
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  188  		return 0;
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  189  
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  190  	if (info[i]->config[tdata->index] & HWMON_T_MIN) {
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  191  		err = chip->ops->write(tdata->dev, hwmon_temp,
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  192  				       hwmon_temp_min, tdata->index, low);
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  193  		if (err && err != -EOPNOTSUPP)
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  194  			return err;
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  195  	}
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  196  
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  197  	if (info[i]->config[tdata->index] & HWMON_T_MAX) {
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  198  		err = chip->ops->write(tdata->dev, hwmon_temp,
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  199  				       hwmon_temp_max, tdata->index, high);
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  200  		if (err && err != -EOPNOTSUPP)
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  201  			return err;
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  202  	}
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  203  
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  204  	return 0;
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  205  }
a5f6c0f85a09f46 Dmitry Osipenko 2021-06-23  206  

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