Re: [PATCH v5 3/4] ALSA: usb-audio: make param quirk_flags change-able in runtime

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

Hi Cryolitia,

kernel test robot noticed the following build warnings:

[auto build test WARNING on 4c421c40c8b30ab7aae1edc7f7e294fcd33fc186]

url:    https://github.com/intel-lab-lkp/linux/commits/Cryolitia-PukNgae-via-B4-Relay/ALSA-usb-audio-add-two-way-convert-between-name-and-bit-for-QUIRK_FLAG_/20250925-173635
base:   4c421c40c8b30ab7aae1edc7f7e294fcd33fc186
patch link:    https://lore.kernel.org/r/20250925-sound-v5-3-2593586ff350%40uniontech.com
patch subject: [PATCH v5 3/4] ALSA: usb-audio: make param quirk_flags change-able in runtime
config: arm64-randconfig-r132-20250927 (https://download.01.org/0day-ci/archive/20250927/202509271834.cL5PYMND-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project cafc064fc7a96b3979a023ddae1da2b499d6c954)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250927/202509271834.cL5PYMND-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/202509271834.cL5PYMND-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> sound/usb/card.c:112:1: sparse: sparse: symbol 'quirk_flags_mutex' was not declared. Should it be static?

vim +/quirk_flags_mutex +112 sound/usb/card.c

   110	
   111	/* protects quirk_flags */
 > 112	DEFINE_MUTEX(quirk_flags_mutex);
   113	

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