[PATCH v1 1/2] ACPI: utils: Add api to read _SUB from ACPI

[kernel test robot]

Hi Stefan,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on rafael-pm/linux-next]
[also build test ERROR on broonie-sound/for-next linus/master v5.19-rc3 next-20220622]
[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]

url:    https://github.com/intel-lab-lkp/linux/commits/Stefan-Binding/Read-_SUB-from-ACPI-to-be-able-to-identify-firmware/20220622-211004
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
config: powerpc-buildonly-randconfig-r002-20220622 (https://download.01.org/0day-ci/archive/20220623/202206230433.0LyjOI85-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 8b8d126598ce7bd5243da7f94f69fa1104288bee)
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
        # install powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/97b928a895ce3105296f0036393bb9ee04f11ae4
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Stefan-Binding/Read-_SUB-from-ACPI-to-be-able-to-identify-firmware/20220622-211004
        git checkout 97b928a895ce3105296f0036393bb9ee04f11ae4
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp at intel.com>

All errors (new ones prefixed by >>):

   In file included from arch/powerpc/kernel/traps.c:32:
   In file included from include/linux/backlight.h:13:
   In file included from include/linux/fb.h:7:
   In file included from include/uapi/linux/fb.h:6:
   In file included from include/linux/i2c.h:13:
>> include/linux/acpi.h:1029:12: error: unused function 'acpi_get_sub' [-Werror,-Wunused-function]
   static int acpi_get_sub(acpi_handle handle, char *sub, size_t size)
              ^
   1 error generated.


vim +/acpi_get_sub +1029 include/linux/acpi.h

  1028	
> 1029	static int acpi_get_sub(acpi_handle handle, char *sub, size_t size)
  1030	{
  1031		return -ENODEV;
  1032	}
  1033	

-- 
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