Hi Hans, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 1746f4db513563bb22e0ba0c419d0c90912dfae1 commit: b2cd0b31ed896c1a6a423019ed3633e890a7f997 media: rtl2832_sdr/vivid/airspy/hackrf/msi2500: drop memset of fmt.sdr.reserved date: 3 months ago config: x86_64-buildonly-randconfig-r003-20210812 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # 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 b2cd0b31ed896c1a6a423019ed3633e890a7f997 # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/media/ 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/media/dvb-frontends/rtl2832_sdr.o: warning: objtool: rtl2832_sdr_try_fmt_sdr_cap() falls through to next function rtl2832_sdr_s_fmt_sdr_cap.cold() --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org