[groeck-staging:hwmon 7/14] drivers/hwmon/hwmon.c:789:12: error: call to undeclared function 'is_hwmon_device'; ISO C99 and later do not support implicit function declarations

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon
head:   ece58c6620869b5d7f0e1305370df473367c085d
commit: b6868a406c5b0bde10303f596fa95010ad68a456 [7/14] hwmon: Ensure that 'dev' passed to hwmon_notify_event() is a hwmon device
config: arm64-randconfig-003-20260822 (https://download.01.org/0day-ci/archive/20260823/[email protected]/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 935bfc708590c60147a79c7df145bb6e68b1d388)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260823/[email protected]/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 <[email protected]>
| Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/

All errors (new ones prefixed by >>):

>> drivers/hwmon/hwmon.c:789:12: error: call to undeclared function 'is_hwmon_device'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     789 |         if (WARN(!is_hwmon_device(dev), "%s is not a hardware monitoring device\n",
         |                   ^
   1 error generated.


vim +/is_hwmon_device +789 drivers/hwmon/hwmon.c

   778	
   779	int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
   780			       u32 attr, int channel)
   781	{
   782		char event[MAX_SYSFS_ATTR_NAME_LENGTH + 5];
   783		char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
   784		char *envp[] = { event, NULL };
   785		const char * const *templates;
   786		const char *template;
   787		int base;
   788	
 > 789		if (WARN(!is_hwmon_device(dev), "%s is not a hardware monitoring device\n",
   790			 dev_name(dev)))
   791			return -EINVAL;
   792		if (type >= ARRAY_SIZE(__templates))
   793			return -EINVAL;
   794		if (attr >= __templates_size[type])
   795			return -EINVAL;
   796	
   797		templates = __templates[type];
   798		template = templates[attr];
   799	
   800		base = hwmon_attr_base(type);
   801	
   802		scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
   803		scnprintf(event, sizeof(event), "NAME=%s", sattr);
   804		sysfs_notify(&dev->kobj, NULL, sattr);
   805		kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
   806	
   807		if (type == hwmon_temp)
   808			hwmon_thermal_notify(dev, channel);
   809	
   810		return 0;
   811	}
   812	EXPORT_SYMBOL_GPL(hwmon_notify_event);
   813	

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