drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hubp.c:1319:6: warning: no previous prototype for function 'hubp1_wait_pipe_read_start'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   3123109284176b1532874591f7c81f3837bbdc17
commit: dd15640bcee5a5fa74fc52557dd6220f48b01116 drm/amd/display: Wait for hubp read line for Pollock
date:   3 weeks ago
config: x86_64-buildonly-randconfig-r004-20220404 (https://download.01.org/0day-ci/archive/20220405/202204050538.gofpqsjw-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c4a1b07d0979e7ff20d7d541af666d822d66b566)
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dd15640bcee5a5fa74fc52557dd6220f48b01116
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout dd15640bcee5a5fa74fc52557dd6220f48b01116
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/gpu/drm/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hubp.c:1319:6: warning: no previous prototype for function 'hubp1_wait_pipe_read_start' [-Wmissing-prototypes]
   void hubp1_wait_pipe_read_start(struct hubp *hubp)
        ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hubp.c:1319:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void hubp1_wait_pipe_read_start(struct hubp *hubp)
   ^
   static 
   1 warning generated.


vim +/hubp1_wait_pipe_read_start +1319 drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hubp.c

  1313	
  1314	/**
  1315	 * hubp1_wait_pipe_read_start - wait for hubp ret path starting read.
  1316	 *
  1317	 * @hubp: hubp struct reference.
  1318	 */
> 1319	void hubp1_wait_pipe_read_start(struct hubp *hubp)
  1320	{
  1321		struct dcn10_hubp *hubp1 = TO_DCN10_HUBP(hubp);
  1322	
  1323		REG_WAIT(HUBPRET_READ_LINE_STATUS,
  1324			PIPE_READ_VBLANK, 0,
  1325			 1, 1000);
  1326	}
  1327	

-- 
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