tree: https://github.com/osandov/linux.git btrfs-send-encoded head: 69d4fc5054f4b51177caf5771100de46bd10bba8 commit: 68812638bf2d878a7c63f705fa098efe9c900806 [11/16] btrfs: implement RWF_ENCODED writes config: nds32-randconfig-r032-20201113 (attached as .config) compiler: nds32le-linux-gcc (GCC) 9.3.0 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/osandov/linux/commit/68812638bf2d878a7c63f705fa098efe9... git remote add osandov https://github.com/osandov/linux.git git fetch --no-tags osandov btrfs-send-encoded git checkout 68812638bf2d878a7c63f705fa098efe9c900806 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nds32 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 >>): 1997 | ssize_t btrfs_encoded_write(struct kiocb *iocb, struct iov_iter *from) | ^~~~~~~~~~~~~~~~~~~ vim +/btrfs_encoded_write +1997 fs/btrfs/file.c 1996 1998 { 1999 struct file *file = iocb->ki_filp; 2000 struct inode *inode = file_inode(file); 2001 struct encoded_iov encoded; 2002 ssize_t ret; 2003 2004 ret = copy_encoded_iov_from_iter(&encoded, from); 2005 if (ret) 2006 return ret; 2007 2008 btrfs_inode_lock(inode, 0); 2009 ret = generic_encoded_write_checks(iocb, &encoded); 2010 if (ret || encoded.len == 0) 2011 goto out; 2012 2013 ret = btrfs_write_check(iocb, from, encoded.len); 2014 if (ret < 0) 2015 goto out; 2016 2017 ret = btrfs_do_encoded_write(iocb, from, &encoded); 2018 out: 2019 btrfs_inode_unlock(inode, 0); 2020 return ret; 2021 } 2022 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org