Hi Jianhua,

I love your patch! Perhaps something to improve:

[auto build test WARNING on lee-backlight/for-backlight-next]
[also build test WARNING on lee-backlight/for-backlight-fixes lee-leds/for-leds-next pavel-leds/for-next linus/master v6.2-rc4 next-20230119]
[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/Jianhua-Lu/backlight-ktz8866-Add-support-for-Kinetic-KTZ8866-backlight/20230118-214354
base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight.git for-backlight-next
patch link:    https://lore.kernel.org/r/20230118131002.15453-2-lujianhua000%40gmail.com
patch subject: [PATCH v6 2/2] backlight: ktz8866: Add support for Kinetic KTZ8866 backlight
config: parisc-randconfig-r031-20230119 (https://download.01.org/0day-ci/archive/20230120/202301200239.m4ZDprWz-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/b862510e8bf9eb34db9d71a372b9de05682cb8ad
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Jianhua-Lu/backlight-ktz8866-Add-support-for-Kinetic-KTZ8866-backlight/20230118-214354
        git checkout b862510e8bf9eb34db9d71a372b9de05682cb8ad
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=parisc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=parisc SHELL=/bin/bash drivers/video/backlight/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot [off-list ref]

All warnings (new ones prefixed by >>):

   In file included from include/linux/bits.h:6,
                    from include/linux/ratelimit_types.h:5,
                    from include/linux/ratelimit.h:5,
                    from include/linux/dev_printk.h:16,
                    from include/linux/device.h:15,
                    from include/linux/backlight.h:12,
                    from drivers/video/backlight/ktz8866.c:8:
   include/vdso/bits.h: In function 'ktz8866_init':

quoted

include/vdso/bits.h:7:40: warning: 'val' is used uninitialized [-Wuninitialized]

       7 | #define BIT(nr)                 (UL(1) << (nr))
         |                                        ^~
   drivers/video/backlight/ktz8866.c:98:22: note: 'val' was declared here
      98 |         unsigned int val;
         |                      ^~~


vim +/val +7 include/vdso/bits.h

3945ff37d2f48d Vincenzo Frascino 2020-03-20  6  
3945ff37d2f48d Vincenzo Frascino 2020-03-20 @7  #define BIT(nr)			(UL(1) << (nr))
3945ff37d2f48d Vincenzo Frascino 2020-03-20  8  

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