tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 8ab774587903771821b59471cc723bba6d893942 commit: 7400b063969bdca4a06cd97f1294d765c8eecbe1 nft_set_pipapo: Introduce AVX2-based lookup implementation date: 1 year, 8 months ago config: x86_64-randconfig-r006-20211116 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project fbe72e41b99dc7994daac300d208a955be3e4a0a) 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/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 7400b063969bdca4a06cd97f1294d765c8eecbe1 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 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 >>): unsigned long *lt = f->lt, bsize = f->bsize; ^ 1 warning generated. vim +/lt +1052 net/netfilter/nft_set_pipapo_avx2.c 1030 1031 /** 1032 * nft_pipapo_avx2_lookup_slow() - Fallback function for uncommon field sizes 1033 * @map: Previous match result, used as initial bitmap 1034 * @fill: Destination bitmap to be filled with current match result 1035 * @f: Field, containing lookup and mapping tables 1036 * @offset: Ignore buckets before the given index, no bits are filled there 1037 * @pkt: Packet data, pointer to input nftables register 1038 * @first: If this is the first field, don't source previous result 1039 * @last: Last field: stop at the first match and return bit index 1040 * 1041 * This function should never be called, but is provided for the case the field 1042 * size doesn't match any of the known data types. Matching rate is 1043 * substantially lower than AVX2 routines. 1044 * 1045 * Return: -1 on no match, rule index of match if @last, otherwise first long 1046 * word index to be checked next (i.e. first filled word). 1047 */ 1048 static int nft_pipapo_avx2_lookup_slow(unsigned long *map, unsigned long *fill, 1049 struct nft_pipapo_field *f, int offset, 1050 const u8 *pkt, bool first, bool last) 1051 { 1053 int i, ret = -1, b; 1054 1055 lt += offset * NFT_PIPAPO_LONGS_PER_M256; 1056 1057 if (first) 1058 memset(map, 0xff, bsize * sizeof(*map)); 1059 1060 for (i = offset; i < bsize; i++) { 1061 if (f->bb == 8) 1062 pipapo_and_field_buckets_8bit(f, map, pkt); 1063 else 1064 pipapo_and_field_buckets_4bit(f, map, pkt); 1065 NFT_PIPAPO_GROUP_BITS_ARE_8_OR_4; 1066 1067 b = pipapo_refill(map, bsize, f->rules, fill, f->mt, last); 1068 1069 if (last) 1070 return b; 1071 1072 if (ret == -1) 1073 ret = b / XSAVE_YMM_SIZE; 1074 } 1075 1076 return ret; 1077 } 1078 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org