[vsyrjala:crtc_clock_compute_8 10/26] drivers/gpu/drm/i915/display/intel_ddi.c:325:5: error: no previous prototype for function 'intel_crtc_dotclock'

[kernel test robot]

tree:   https://github.com/vsyrjala/linux.git crtc_clock_compute_8
head:   aee27a93a2e9c552d016d4eadaff5aa87dccce13
commit: eb839775996f072098b810f91bc34757d1ea008e [10/26] drm/i915: Extract intel_crtc_dotclock()
config: x86_64-randconfig-r023-20220502 (https://download.01.org/0day-ci/archive/20220504/202205041506.Q9YdhHrE-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 363b3a645a1e30011cc8da624f13dac5fd915628)
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/vsyrjala/linux/commit/eb839775996f072098b810f91bc34757d1ea008e
        git remote add vsyrjala https://github.com/vsyrjala/linux.git
        git fetch --no-tags vsyrjala crtc_clock_compute_8
        git checkout eb839775996f072098b810f91bc34757d1ea008e
        # 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=x86_64 SHELL=/bin/bash drivers/gpu/drm/i915/

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

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/i915/display/intel_ddi.c:325:5: error: no previous prototype for function 'intel_crtc_dotclock' [-Werror,-Wmissing-prototypes]
   int intel_crtc_dotclock(const struct intel_crtc_state *pipe_config)
       ^
   drivers/gpu/drm/i915/display/intel_ddi.c:325:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   int intel_crtc_dotclock(const struct intel_crtc_state *pipe_config)
   ^
   static 
   1 error generated.


vim +/intel_crtc_dotclock +325 drivers/gpu/drm/i915/display/intel_ddi.c

   324	
 > 325	int intel_crtc_dotclock(const struct intel_crtc_state *pipe_config)
   326	{
   327		int dotclock;
   328	
   329		if (intel_crtc_has_dp_encoder(pipe_config))
   330			dotclock = intel_dotclock_calculate(pipe_config->port_clock,
   331							    &pipe_config->dp_m_n);
   332		else if (pipe_config->has_hdmi_sink && pipe_config->pipe_bpp > 24)
   333			dotclock = pipe_config->port_clock * 24 / pipe_config->pipe_bpp;
   334		else
   335			dotclock = pipe_config->port_clock;
   336	
   337		if (pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR420 &&
   338		    !intel_crtc_has_dp_encoder(pipe_config))
   339			dotclock *= 2;
   340	
   341		if (pipe_config->pixel_multiplier)
   342			dotclock /= pipe_config->pixel_multiplier;
   343	
   344		return dotclock;
   345	}
   346	

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