Okay, somehow i think Yuli the origin commit message some misleading things,the whole story expand that origin mips/crypto/crc32-mips.c code "len -= sizeof(u32);" necessary only in "!CONFIG_64BIT" macro define, they are just a "binary bit" game as we tran the number to binary bit, while less and less one in 64bit ,the less thing we do if >=32bit do once, >=16bit do once ... etc... If we delete the useless code line, it is very cool, and unrelated to specific ISA. We also think maybe we need to add "#ifnef CONFIG_64BIT"in origin mips/crypto/crc32-mips.c "len -= sizeof(u32);", but it add code instead of delete code... Thanks. Guan Wentao