tree: https://github.com/thierryreding/linux for-5.13/work head: 009ea3ee74a12859073a37d2ef800fa154ff7705 commit: 1997b739eee70f5f7a656a10c432ee395020f12a [21/49] drm/tegra: Implement new UAPI config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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://github.com/thierryreding/linux/commit/1997b739eee70f5f7a656a10c43... git remote add thierryreding https://github.com/thierryreding/linux git fetch --no-tags thierryreding for-5.13/work git checkout 1997b739eee70f5f7a656a10c432ee395020f12a # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm64 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 >>): In file included from drivers/gpu/drm/tegra/uapi/uapi.c:12: 84 | }; | ^ drivers/gpu/drm/tegra/uapi/uapi.c:62:5: warning: no previous prototype for 'close_channel_ctx' [-Wmissing-prototypes] 62 | int close_channel_ctx(int id, void *p, void *data) | ^~~~~~~~~~~~~~~~~ vim +84 drivers/gpu/drm/tegra/uapi/../drm.h d43f81cbaf4353 drivers/gpu/host1x/drm/drm.h Terje Bergstrom 2013-03-22 74 53fa7f7204c97d drivers/gpu/host1x/drm/drm.h Thierry Reding 2013-09-24 75 struct tegra_drm_client_ops { 53fa7f7204c97d drivers/gpu/host1x/drm/drm.h Thierry Reding 2013-09-24 76 int (*open_channel)(struct tegra_drm_client *client, c88c363072c6dc drivers/gpu/host1x/drm/drm.h Thierry Reding 2013-09-26 77 struct tegra_drm_context *context); c88c363072c6dc drivers/gpu/host1x/drm/drm.h Thierry Reding 2013-09-26 78 void (*close_channel)(struct tegra_drm_context *context); c40f0f1afcb1dc drivers/gpu/drm/tegra/drm.h Thierry Reding 2013-10-10 79 int (*is_addr_reg)(struct device *dev, u32 class, u32 offset); 0f563a4bf66e51 drivers/gpu/drm/tegra/drm.h Dmitry Osipenko 2017-06-15 80 int (*is_valid_class)(u32 class); c88c363072c6dc drivers/gpu/host1x/drm/drm.h Thierry Reding 2013-09-26 81 int (*submit)(struct tegra_drm_context *context, d43f81cbaf4353 drivers/gpu/host1x/drm/drm.h Terje Bergstrom 2013-03-22 82 struct drm_tegra_submit *args, struct drm_device *drm, d43f81cbaf4353 drivers/gpu/host1x/drm/drm.h Terje Bergstrom 2013-03-22 83 struct drm_file *file); d43f81cbaf4353 drivers/gpu/host1x/drm/drm.h Terje Bergstrom 2013-03-22 @84 }; d43f81cbaf4353 drivers/gpu/host1x/drm/drm.h Terje Bergstrom 2013-03-22 85 :::::: The code at line 84 was first introduced by commit :::::: d43f81cbaf43531a977e8b4c4427f19acf8a5061 drm/tegra: Add gr2d device :::::: TO: Terje Bergstrom <tbergstrom(a)nvidia.com&gt; :::::: CC: Thierry Reding <thierry.reding(a)avionic-design.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org