tree: https://git.kernel.org/pub/scm/linux/kernel/git/colyli/linux-bcache.git for-next head: 8ad224d299e082549e284f92105ad151fe1bc79d commit: 366b8b8a1eab6bcbfb6ad33d53802fab0e2feb50 [24/26] bcache: add sysfs file to display feature sets information of cache set config: alpha-randconfig-s032-20200717 (attached as .config) compiler: alpha-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-49-g707c5017-dirty git checkout 366b8b8a1eab6bcbfb6ad33d53802fab0e2feb50 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=alpha If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +22 drivers/md/bcache/features.c 558b3a263def958 Coly Li 2020-07-17 18 558b3a263def958 Coly Li 2020-07-17 19 static struct feature feature_list[] = { 558b3a263def958 Coly Li 2020-07-17 20 {BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_LARGE_BUCKET, 558b3a263def958 Coly Li 2020-07-17 21 "large_bucket"}, 558b3a263def958 Coly Li 2020-07-17 @22 {0, 0, 0 }, 558b3a263def958 Coly Li 2020-07-17 23 }; 366b8b8a1eab6bc Coly Li 2020-07-17 24 :::::: The code at line 22 was first introduced by commit :::::: 558b3a263def9580757cee376f667767742759b6 bcache: add bucket_size_hi into struct cache_sb_disk for large bucket :::::: TO: Coly Li <colyli(a)suse.de&gt; :::::: CC: Coly Li <colyli(a)suse.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org