linux-kernel - drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1617:6: warning: no previous prototype for function 'is_timing

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Date:   Tue, 29 Mar 2022 21:41:47 +0800
From:   kernel test robot <lkp@...el.com>
To:     Roman Li <Roman.Li@....com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Alex Deucher <alexander.deucher@....com>,
        Hersen Wu <hersenwu@....com>
Subject: drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1617:6:
 warning: no previous prototype for function 'is_timing_changed'

Hi Roman,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1930a6e739c4b4a654a69164dbe39e554d228915
commit: 17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b drm/amd/display: Add dsc pre-validation in atomic check
date:   6 weeks ago
config: arm64-randconfig-r031-20220327 (https://download.01.org/0day-ci/archive/20220329/202203292131.ydRfKsCO-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0f6d9501cf49ce02937099350d08f20c4af86f3d)
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 arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 17ce8a6907f77b7ac97ddaa071d8a1f6e06ce85b
        # 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=arm64 SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1617:6: warning: no previous prototype for function 'is_timing_changed' [-Wmissing-prototypes]
   bool is_timing_changed(struct dc_stream_state *cur_stream,
        ^
   drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c:1617:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   bool is_timing_changed(struct dc_stream_state *cur_stream,
   ^
   static 
   1 warning generated.


vim +/is_timing_changed +1617 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_resource.c

  1616	
> 1617	bool is_timing_changed(struct dc_stream_state *cur_stream,
  1618			       struct dc_stream_state *new_stream)
  1619	{
  1620		if (cur_stream == NULL)
  1621			return true;
  1622	
  1623		/* If output color space is changed, need to reprogram info frames */
  1624		if (cur_stream->output_color_space != new_stream->output_color_space)
  1625			return true;
  1626	
  1627		return memcmp(
  1628			&cur_stream->timing,
  1629			&new_stream->timing,
  1630			sizeof(struct dc_crtc_timing)) != 0;
  1631	}
  1632	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp