[PATCH v3 4/4] watchdog: Add support for VIA/WonderMedia SoC watchdog functionality

[kernel test robot]

Hi Alexey,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 92a09c47464d040866cf2b4cd052bc60555185fb]

url:    https://github.com/intel-lab-lkp/linux/commits/Alexey-Charkov/dt-bindings-timer-via-vt8500-timer-Convert-to-YAML/20250516-025729
base:   92a09c47464d040866cf2b4cd052bc60555185fb
patch link:    https://lore.kernel.org/r/20250515-vt8500-timer-updates-v3-4-2197a1b062bd%40gmail.com
patch subject: [PATCH v3 4/4] watchdog: Add support for VIA/WonderMedia SoC watchdog functionality
config: sparc-allmodconfig (https://download.01.org/0day-ci/archive/20250516/202505161430.wdURc0TG-lkp@intel.com/config)
compiler: sparc64-linux-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250516/202505161430.wdURc0TG-lkp@intel.com/reproduce)

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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505161430.wdURc0TG-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/watchdog/vt8500-wdt.c: In function 'vt8500_wdt_probe':
>> drivers/watchdog/vt8500-wdt.c:98:44: warning: conversion from 'long unsigned int' to 'unsigned int' changes value from '6148914691236517' to '3287081637' [-Woverflow]
      98 |         drvdata->wdd.max_hw_heartbeat_ms = -1UL / (VT8500_TIMER_HZ / 1000);
         |                                            ^


vim +98 drivers/watchdog/vt8500-wdt.c

    75	
    76	static int vt8500_wdt_probe(struct platform_device *pdev)
    77	{
    78		struct device *dev = &pdev->dev;
    79		struct vt8500_wdt *drvdata;
    80	
    81		drvdata = devm_kzalloc(dev, sizeof(struct vt8500_wdt), GFP_KERNEL);
    82		if (!drvdata)
    83			return -ENOMEM;
    84	
    85		/*
    86		 * The register area where the timer and watchdog reside is disarranged.
    87		 * Hence mapping individual register blocks for the timer and watchdog
    88		 * is not recommended as they would have access to each others
    89		 * registers. The timer driver creates the watchdog as a child device.
    90		 * During the watchdogs creation, the timer driver passes the base
    91		 * address to the watchdog over the private interface.
    92		 */
    93	
    94		drvdata->regbase = (void __iomem *)dev->platform_data;
    95	
    96		drvdata->wdd.info = &vt8500_watchdog_info;
    97		drvdata->wdd.ops = &vt8500_watchdog_ops;
  > 98		drvdata->wdd.max_hw_heartbeat_ms = -1UL / (VT8500_TIMER_HZ / 1000);
    99		drvdata->wdd.parent = dev;
   100	
   101		watchdog_set_drvdata(&drvdata->wdd, drvdata);
   102	
   103		return devm_watchdog_register_device(dev, &drvdata->wdd);
   104	}
   105	

-- 
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https://github.com/intel/lkp-tests/wiki