[kbuild-all] drivers/gpu/drm/mediatek/mtk_drm_drv.c:327:24: warning: no previous prototype for 'mtk_drm_gem_prime_import'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 8882572675c1bb1cc544f4e229a11661f1fc52e4 commit: 4c6f3196e6ea111c456c6086dc3f57d4706b0b2d drm/mediatek: use correct device to import PRIME buffers date: 11 months ago config: arm-randconfig-r026-20200717 (attached as .config) compiler: arm-linux-gnueabi-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 git checkout 4c6f3196e6ea111c456c6086dc3f57d4706b0b2d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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 >>): drivers/gpu/drm/mediatek/mtk_drm_drv.c: In function 'mtk_atomic_wait_for_fences': drivers/gpu/drm/mediatek/mtk_drm_drv.c:43:20: warning: variable 'plane' set but not used [-Wunused-but-set-variable] 43 | struct drm_plane *plane; | ^~~~~ drivers/gpu/drm/mediatek/mtk_drm_drv.c: At top level: 327 | struct drm_gem_object *mtk_drm_gem_prime_import(struct drm_device *dev, | ^~~~~~~~~~~~~~~~~~~~~~~~ vim +/mtk_drm_gem_prime_import +327 drivers/gpu/drm/mediatek/mtk_drm_drv.c 322 323 /* 324 * We need to override this because the device used to import the memory is 325 * not dev->dev, as drm_gem_prime_import() expects. 326 */ 328 struct dma_buf *dma_buf) 329 { 330 struct mtk_drm_private *private = dev->dev_private; 331 332 return drm_gem_prime_import_dev(dev, dma_buf, private->dma_dev); 333 } 334 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org