Hi Douglas,

kernel test robot noticed the following build warnings:

[auto build test WARNING on robh/for-next]
[also build test WARNING on hid/for-next drm-misc/drm-misc-next linus/master v6.4-rc3 next-20230524]
[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/Douglas-Anderson/dt-bindings-HID-i2c-hid-Add-panel-property-to-i2c-hid-backed-panels/20230524-034323
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
patch link:    https://lore.kernel.org/r/20230523122802.8.I962bb462ede779005341c49320740ed95810021d%40changeid
patch subject: [PATCH 8/9] HID: i2c-hid: Do panel follower work on the system_wq
config: i386-randconfig-s001
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/97c5984c98b7721d6c5299d8542c612e5c3240d3
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Douglas-Anderson/dt-bindings-HID-i2c-hid-Add-panel-property-to-i2c-hid-backed-panels/20230524-034323
        git checkout 97c5984c98b7721d6c5299d8542c612e5c3240d3
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 olddefconfig
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/hid/i2c-hid/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202305250203.PEElnTad-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/hid/i2c-hid/i2c-hid-core.c:1013:5: sparse: sparse: symbol 'i2c_hid_core_initial_power_up' was not declared. Should it be static?
>> drivers/hid/i2c-hid/i2c-hid-core.c:1067:6: sparse: sparse: symbol 'ihid_core_panel_prepare_work' was not declared. Should it be static?
   drivers/hid/i2c-hid/i2c-hid-core.c:1093:5: sparse: sparse: symbol 'i2c_hid_core_panel_prepared' was not declared. Should it be static?
   drivers/hid/i2c-hid/i2c-hid-core.c:1107:5: sparse: sparse: symbol 'i2c_hid_core_panel_unpreparing' was not declared. Should it be static?

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