Hi Sean, I love your patch! Yet something to improve: [auto build test ERROR on drm-tip/drm-tip] [cannot apply to drm-intel/for-linux-next drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next linus/master drm/drm-next v5.15-rc1 next-20210913] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Sean-Paul/drm-hdcp-Pull-HDCP-aut... base: git://anongit.freedesktop.org/drm/drm-tip drm-tip config: x86_64-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/995396b306d5f83dea2943ecc2718f344... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Sean-Paul/drm-hdcp-Pull-HDCP-auth-exchange-check-into/20210914-020004 git checkout 995396b306d5f83dea2943ecc2718f344a80d46e # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 658 | static const struct drm_hdcp_helper_funcs intel_dp_mst_hdcp_helper_funcs = { | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors vim +/intel_dp_mst_hdcp_helper_funcs +658 drivers/gpu/drm/i915/display/intel_dp_hdcp.c 657 659 .setup = intel_hdcp_setup, 660 .load_keys = intel_hdcp_load_keys, 661 .hdcp2_capable = intel_dp_hdcp2_capable, 662 .hdcp2_enable = intel_hdcp2_enable, 663 .hdcp2_check_link = intel_hdcp2_check_link, 664 .hdcp2_disable = intel_hdcp2_disable, 665 .hdcp1_send_an_aksv = intel_dp_hdcp1_send_an_aksv, 666 .hdcp1_store_receiver_info = intel_hdcp1_store_receiver_info, 667 .hdcp1_enable_encryption = intel_hdcp1_enable_encryption, 668 .hdcp1_wait_for_r0 = intel_hdcp1_wait_for_r0, 669 .hdcp1_match_ri = intel_hdcp1_match_ri, 670 .hdcp1_post_encryption = intel_dp_mst_hdcp1_post_encryption, 671 .hdcp1_store_ksv_fifo = intel_hdcp1_store_ksv_fifo, 672 .hdcp1_disable = intel_dp_mst_hdcp1_disable, 673 }; 674 675 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org