Hi, [This is an automated email] This commit has been processed because it contains a -stable tag. The stable tag indicates that it's relevant for the following trees: all The bot has tested the following trees: v5.1.9, v4.19.50, v4.14.125, v4.9.181, v4.4.181. v5.1.9: Build failed! Errors: drivers/gpu/drm/drm_dp_mst_topology.c:2672:9: error: implicit declaration of function ‘drm_dp_get_validated_port_ref’; did you mean ‘drm_mode_validate_driver’? [-Werror=implicit-function-declaration] drivers/gpu/drm/drm_dp_mst_topology.c:2676:9: error: implicit declaration of function ‘drm_dp_get_validated_mstb_ref’; did you mean ‘drm_mode_validate_size’? [-Werror=implicit-function-declaration] drivers/gpu/drm/drm_dp_mst_topology.c:2684:3: error: implicit declaration of function ‘drm_dp_put_mst_branch_device’; did you mean ‘drm_dp_get_mst_branch_device’? [-Werror=implicit-function-declaration] drivers/gpu/drm/drm_dp_mst_topology.c:2715:2: error: implicit declaration of function ‘drm_dp_put_port’; did you mean ‘drm_dp_get_port’? [-Werror=implicit-function-declaration] v4.19.50: Build OK! v4.14.125: Build OK! v4.9.181: Build OK! v4.4.181: Build OK! How should we proceed with this patch? -- Thanks, Sasha