Re: [PATCH v4 1/2] platform/x86: Add Uniwill laptop driver

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

Hi Armin,

kernel test robot noticed the following build errors:

[auto build test ERROR on lwn/docs-next]
[also build test ERROR on linus/master v6.17 next-20250929]
[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/Armin-Wolf/platform-x86-Add-Uniwill-laptop-driver/20250928-093543
base:   git://git.lwn.net/linux.git docs-next
patch link:    https://lore.kernel.org/r/20250928013253.10869-2-W_Armin%40gmx.de
patch subject: [PATCH v4 1/2] platform/x86: Add Uniwill laptop driver
config: x86_64-allyesconfig (https://download.01.org/0day-ci/archive/20250930/202509301709.jGxwZmZX-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250930/202509301709.jGxwZmZX-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509301709.jGxwZmZX-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/platform/x86/uniwill/uniwill-acpi.c:1243:3: warning: label followed by a declaration is a C23 extension [-Wc23-extensions]
    1243 |                 guard(mutex)(&data->battery_lock);
         |                 ^
   include/linux/cleanup.h:401:2: note: expanded from macro 'guard'
     401 |         CLASS(_name, __UNIQUE_ID(guard))
         |         ^
   include/linux/cleanup.h:290:2: note: expanded from macro 'CLASS'
     290 |         class_##_name##_t var __cleanup(class_##_name##_destructor) =   \
         |         ^
   <scratch space>:49:1: note: expanded from here
      49 | class_mutex_t
         | ^
   drivers/platform/x86/uniwill/uniwill-acpi.c:1250:3: warning: label followed by a declaration is a C23 extension [-Wc23-extensions]
    1250 |                 guard(mutex)(&data->input_lock);
         |                 ^
   include/linux/cleanup.h:401:2: note: expanded from macro 'guard'
     401 |         CLASS(_name, __UNIQUE_ID(guard))
         |         ^
   include/linux/cleanup.h:290:2: note: expanded from macro 'CLASS'
     290 |         class_##_name##_t var __cleanup(class_##_name##_destructor) =   \
         |         ^
   <scratch space>:60:1: note: expanded from here
      60 | class_mutex_t
         | ^
>> drivers/platform/x86/uniwill/uniwill-acpi.c:1249:2: error: cannot jump from switch statement to this case label
    1249 |         default:
         |         ^
   drivers/platform/x86/uniwill/uniwill-acpi.c:1243:3: note: jump bypasses initialization of variable with __attribute__((cleanup))
    1243 |                 guard(mutex)(&data->battery_lock);
         |                 ^
   include/linux/cleanup.h:401:15: note: expanded from macro 'guard'
     401 |         CLASS(_name, __UNIQUE_ID(guard))
         |                      ^
   include/linux/compiler.h:166:29: note: expanded from macro '__UNIQUE_ID'
     166 | #define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
         |                             ^
   include/linux/compiler_types.h:84:22: note: expanded from macro '__PASTE'
      84 | #define __PASTE(a,b) ___PASTE(a,b)
         |                      ^
   include/linux/compiler_types.h:83:23: note: expanded from macro '___PASTE'
      83 | #define ___PASTE(a,b) a##b
         |                       ^
   <scratch space>:47:1: note: expanded from here
      47 | __UNIQUE_ID_guard1072
         | ^
   2 warnings and 1 error generated.


vim +1249 drivers/platform/x86/uniwill/uniwill-acpi.c

  1235	
  1236	static int uniwill_notifier_call(struct notifier_block *nb, unsigned long action, void *dummy)
  1237	{
  1238		struct uniwill_data *data = container_of(nb, struct uniwill_data, nb);
  1239		struct uniwill_battery_entry *entry;
  1240	
  1241		switch (action) {
  1242		case UNIWILL_OSD_BATTERY_ALERT:
  1243			guard(mutex)(&data->battery_lock);
  1244			list_for_each_entry(entry, &data->batteries, head) {
  1245				power_supply_changed(entry->battery);
  1246			}
  1247	
  1248			return NOTIFY_OK;
> 1249		default:
  1250			guard(mutex)(&data->input_lock);
  1251			sparse_keymap_report_event(data->input_device, action, 1, true);
  1252	
  1253			return NOTIFY_OK;
  1254		}
  1255	}
  1256	

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