[kbuild-all] drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c:399:5: warning: no previous prototype for 'amdgpu_vkms_output_init'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 8ab774587903771821b59471cc723bba6d893942 commit: 733ee71ae0d03a8b03711dca8bc94c8ac05a6bc3 drm/amdgpu: replace dce_virtual with amdgpu_vkms (v3) date: 3 months ago config: arc-randconfig-r043-20210927 (attached as .config) compiler: arceb-elf-gcc (GCC) 11.2.0 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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 733ee71ae0d03a8b03711dca8bc94c8ac05a6bc3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 399 | int amdgpu_vkms_output_init(struct drm_device *dev, | ^~~~~~~~~~~~~~~~~~~~~~~ vim +/amdgpu_vkms_output_init +399 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c 84ec374bd58036 Ryan Taylor 2021-06-07 398 84ec374bd58036 Ryan Taylor 2021-06-07 @399 int amdgpu_vkms_output_init(struct drm_device *dev, 84ec374bd58036 Ryan Taylor 2021-06-07 400 struct amdgpu_vkms_output *output, int index) 84ec374bd58036 Ryan Taylor 2021-06-07 401 { 84ec374bd58036 Ryan Taylor 2021-06-07 402 struct drm_connector *connector = &output->connector; 84ec374bd58036 Ryan Taylor 2021-06-07 403 struct drm_encoder *encoder = &output->encoder; 84ec374bd58036 Ryan Taylor 2021-06-07 404 struct drm_crtc *crtc = &output->crtc; 84ec374bd58036 Ryan Taylor 2021-06-07 405 struct drm_plane *primary, *cursor = NULL; 84ec374bd58036 Ryan Taylor 2021-06-07 406 int ret; 84ec374bd58036 Ryan Taylor 2021-06-07 407 84ec374bd58036 Ryan Taylor 2021-06-07 408 primary = amdgpu_vkms_plane_init(dev, DRM_PLANE_TYPE_PRIMARY, index); 84ec374bd58036 Ryan Taylor 2021-06-07 409 if (IS_ERR(primary)) 84ec374bd58036 Ryan Taylor 2021-06-07 410 return PTR_ERR(primary); 84ec374bd58036 Ryan Taylor 2021-06-07 411 84ec374bd58036 Ryan Taylor 2021-06-07 412 ret = amdgpu_vkms_crtc_init(dev, crtc, primary, cursor); 84ec374bd58036 Ryan Taylor 2021-06-07 413 if (ret) 84ec374bd58036 Ryan Taylor 2021-06-07 414 goto err_crtc; 84ec374bd58036 Ryan Taylor 2021-06-07 415 84ec374bd58036 Ryan Taylor 2021-06-07 416 ret = drm_connector_init(dev, connector, &amdgpu_vkms_connector_funcs, 84ec374bd58036 Ryan Taylor 2021-06-07 417 DRM_MODE_CONNECTOR_VIRTUAL); 84ec374bd58036 Ryan Taylor 2021-06-07 418 if (ret) { 84ec374bd58036 Ryan Taylor 2021-06-07 419 DRM_ERROR("Failed to init connector\n"); 84ec374bd58036 Ryan Taylor 2021-06-07 420 goto err_connector; 84ec374bd58036 Ryan Taylor 2021-06-07 421 } 84ec374bd58036 Ryan Taylor 2021-06-07 422 84ec374bd58036 Ryan Taylor 2021-06-07 423 drm_connector_helper_add(connector, &amdgpu_vkms_conn_helper_funcs); 84ec374bd58036 Ryan Taylor 2021-06-07 424 84ec374bd58036 Ryan Taylor 2021-06-07 425 ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_VIRTUAL); 84ec374bd58036 Ryan Taylor 2021-06-07 426 if (ret) { 84ec374bd58036 Ryan Taylor 2021-06-07 427 DRM_ERROR("Failed to init encoder\n"); 84ec374bd58036 Ryan Taylor 2021-06-07 428 goto err_encoder; 84ec374bd58036 Ryan Taylor 2021-06-07 429 } 84ec374bd58036 Ryan Taylor 2021-06-07 430 encoder->possible_crtcs = 1 << index; 84ec374bd58036 Ryan Taylor 2021-06-07 431 84ec374bd58036 Ryan Taylor 2021-06-07 432 ret = drm_connector_attach_encoder(connector, encoder); 84ec374bd58036 Ryan Taylor 2021-06-07 433 if (ret) { 84ec374bd58036 Ryan Taylor 2021-06-07 434 DRM_ERROR("Failed to attach connector to encoder\n"); 84ec374bd58036 Ryan Taylor 2021-06-07 435 goto err_attach; 84ec374bd58036 Ryan Taylor 2021-06-07 436 } 84ec374bd58036 Ryan Taylor 2021-06-07 437 84ec374bd58036 Ryan Taylor 2021-06-07 438 drm_mode_config_reset(dev); 84ec374bd58036 Ryan Taylor 2021-06-07 439 84ec374bd58036 Ryan Taylor 2021-06-07 440 return 0; 84ec374bd58036 Ryan Taylor 2021-06-07 441 84ec374bd58036 Ryan Taylor 2021-06-07 442 err_attach: 84ec374bd58036 Ryan Taylor 2021-06-07 443 drm_encoder_cleanup(encoder); 84ec374bd58036 Ryan Taylor 2021-06-07 444 84ec374bd58036 Ryan Taylor 2021-06-07 445 err_encoder: 84ec374bd58036 Ryan Taylor 2021-06-07 446 drm_connector_cleanup(connector); 84ec374bd58036 Ryan Taylor 2021-06-07 447 84ec374bd58036 Ryan Taylor 2021-06-07 448 err_connector: 84ec374bd58036 Ryan Taylor 2021-06-07 449 drm_crtc_cleanup(crtc); 84ec374bd58036 Ryan Taylor 2021-06-07 450 84ec374bd58036 Ryan Taylor 2021-06-07 451 err_crtc: 84ec374bd58036 Ryan Taylor 2021-06-07 452 drm_plane_cleanup(primary); 84ec374bd58036 Ryan Taylor 2021-06-07 453 84ec374bd58036 Ryan Taylor 2021-06-07 454 return ret; 84ec374bd58036 Ryan Taylor 2021-06-07 455 } 733ee71ae0d03a Ryan Taylor 2021-06-18 456 :::::: The code at line 399 was first introduced by commit :::::: 84ec374bd580364a32818c9fc269c19d6e931cab drm/amdgpu: create amdgpu_vkms (v4) :::::: TO: Ryan Taylor <Ryan.Taylor(a)amd.com&gt; :::::: CC: Alex Deucher <alexander.deucher(a)amd.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org