tree: https://git.kernel.org/pub/scm/linux/kernel/git/kbingham/rcar.git vsp1/v3u head: 178de9aa2b539612048856e54a292efda80f41c1 commit: fb68cc895bd671aa7d0b1cf67f873edb9b2a3f2e [13/23] WIP: Add async notifier state debug config: mips-randconfig-r013-20210317 (attached as .config) compiler: mips-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://git.kernel.org/pub/scm/linux/kernel/git/kbingham/rcar.git/commit/... git remote add rcar https://git.kernel.org/pub/scm/linux/kernel/git/kbingham/rcar.git git fetch --no-tags rcar vsp1/v3u git checkout fb68cc895bd671aa7d0b1cf67f873edb9b2a3f2e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 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 >>): 777 | int v4l2_async_pending_devices(void) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/media/v4l2-core/v4l2-async.c: In function 'v4l2_async_pending_devices': drivers/media/v4l2-core/v4l2-async.c:788:29: warning: unused variable 'asd' [-Wunused-variable] 788 | struct v4l2_async_subdev *asd; | ^~~ drivers/media/v4l2-core/v4l2-async.c:786:23: warning: unused variable 'v4l2_dev' [-Wunused-variable] 786 | struct v4l2_device *v4l2_dev = | ^~~~~~~~ vim +/v4l2_async_pending_devices +777 drivers/media/v4l2-core/v4l2-async.c 775 776 778 { 779 struct v4l2_async_notifier *notifier; 780 struct v4l2_subdev *sd; 781 782 mutex_lock(&list_lock); 783 784 /* Report on pending async subdevices. */ 785 list_for_each_entry(notifier, &notifier_list, list) { 786 struct v4l2_device *v4l2_dev = 787 v4l2_async_notifier_find_v4l2_dev(notifier); 788 struct v4l2_async_subdev *asd; 789 790 if (list_empty(&notifier->waiting)) { 791 printk("notifier is not waiting..."); 792 continue; 793 } 794 795 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org