tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-4.19 head: b9a3f5405fb3783912a70780b9f51b8942feed91 commit: 9602e2b071719b0f1e22a3a9ea2f5f3a6ba8f272 [27/50] UPSTREAM: drm: revocation check at drm subsystem config: i386-randconfig-s031-20201113 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-107-gaf3512a6-dirty git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel git fetch --no-tags chrome-os chromeos-4.19 git checkout 9602e2b071719b0f1e22a3a9ea2f5f3a6ba8f272 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" drivers/gpu/drm/drm_hdcp.c:235:6: warning: no previous prototype for 'drm_hdcp_request_srm' [-Wmissing-prototypes] 235 | void drm_hdcp_request_srm(struct drm_device *drm_dev) | ^~~~~~~~~~~~~~~~~~~~ drivers/gpu/drm/drm_hdcp.c:317:5: warning: no previous prototype for 'drm_setup_hdcp_srm' [-Wmissing-prototypes] 317 | int drm_setup_hdcp_srm(struct class *drm_class) | ^~~~~~~~~~~~~~~~~~ drivers/gpu/drm/drm_hdcp.c:327:6: warning: no previous prototype for 'drm_teardown_hdcp_srm' [-Wmissing-prototypes] 327 | void drm_teardown_hdcp_srm(struct class *drm_class) | ^~~~~~~~~~~~~~~~~~~~~ Please review and possibly fold the followup patch. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org