tree: https://github.com/ammarfaizi2/linux-block dhowells/linux-fs/netfs-lib head: e450b62f32df4384c141a6a382811b3fe5723bad commit: e6b340ed3634bb80396afb564c499eebdeff601f [14/24] netfs: Use a buffer in netfs_read_request and add pages to it config: x86_64-randconfig-a001-20220117 (https://download.01.org/0day-ci/archive/20220118/202201180514.gVYTloyy-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 5f782d25a742302d25ef3c8b84b54f7483c2deb9) 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://github.com/ammarfaizi2/linux-block/commit/e6b340ed3634bb80396afb5... git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block dhowells/linux-fs/netfs-lib git checkout e6b340ed3634bb80396afb564c499eebdeff601f # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash fs/netfs/ 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 >>): folio_put(folio); ^~~~~ fs/netfs/read_helper.c:928:21: note: initialize the variable 'folio' to silence this warning struct folio *folio; ^ = NULL 1 warning generated. vim +/folio +979 fs/netfs/read_helper.c 943 944 ret = netfs_rreq_add_folios_to_buffer(rreq, want_index, have_index - 1, 945 gfp_mask); 946 if (ret < 0) 947 return ret; 948 have_folios += have_index - want_index; 949 950 ret = netfs_rreq_add_folios_to_buffer(rreq, have_index + have_folios, 951 want_index + want_folios - 1, 952 gfp_mask); 953 if (ret < 0) 954 return ret; 955 956 /* Transfer the folios proposed by the VM into the buffer and take refs 957 * on them. The locks will be dropped in netfs_rreq_unlock(). 958 */ 959 if (ractl) { 960 while ((folio = readahead_folio(ractl))) { 961 folio_get(folio); 962 if (folio == keep) 963 folio_get(folio); 964 ret = xa_insert_set_mark(&rreq->buffer, 965 folio_index(folio), folio, 966 XA_MARK_0, gfp_mask); 967 if (ret < 0) { 968 if (folio != keep) 969 folio_unlock(folio); 970 folio_put(folio); 971 return ret; 972 } 973 } 974 } else { 975 folio_get(keep); 976 ret = xa_insert_set_mark(&rreq->buffer, keep->index, keep, 977 XA_MARK_0, gfp_mask); 978 if (ret < 0) { 980 return ret; 981 } 982 } 983 return 0; 984 } 985 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org