[kbuild-all] drivers/media/platform/exynos4-is/fimc-isp-video.h:35:6: warning: no previous prototype for 'fimc_isp_video_device_unregister'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 4b6c093e21d36bede0fd88fd0aeb3b03647260e4 commit: bbd7ffdbef6888459f301c5889f3b14ada38b913 clk: Allow the common clk framework to be selectable date: 3 months ago config: ia64-randconfig-r033-20200816 (attached as .config) compiler: ia64-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 git checkout bbd7ffdbef6888459f301c5889f3b14ada38b913 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 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 >>): In file included from drivers/media/platform/exynos4-is/fimc-isp.c:25: 35 | void fimc_isp_video_device_unregister(struct fimc_isp *isp, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout bbd7ffdbef6888459f301c5889f3b14ada38b913 vim +/fimc_isp_video_device_unregister +35 drivers/media/platform/exynos4-is/fimc-isp-video.h 34947b8aebe3f2 Sylwester Nawrocki 2013-12-20 34 34947b8aebe3f2 Sylwester Nawrocki 2013-12-20 @35 void fimc_isp_video_device_unregister(struct fimc_isp *isp, 34947b8aebe3f2 Sylwester Nawrocki 2013-12-20 36 enum v4l2_buf_type type) 34947b8aebe3f2 Sylwester Nawrocki 2013-12-20 37 { 34947b8aebe3f2 Sylwester Nawrocki 2013-12-20 38 } 34947b8aebe3f2 Sylwester Nawrocki 2013-12-20 39 #endif /* !CONFIG_VIDEO_EXYNOS4_ISP_DMA_CAPTURE */ 34947b8aebe3f2 Sylwester Nawrocki 2013-12-20 40 :::::: The code at line 35 was first introduced by commit :::::: 34947b8aebe3f2d4eceb65fceafa92bf8dc97d96 [media] exynos4-is: Add the FIMC-IS ISP capture DMA driver :::::: TO: Sylwester Nawrocki <s.nawrocki(a)samsung.com&gt; :::::: CC: Mauro Carvalho Chehab <m.chehab(a)samsung.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org