Hi Chao, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-stable.git linux-4.19.y head: e1712134c01acfde2d20aea490ad3b3581ec8e0a commit: 2f7cc89b033f4d379139ec47a801a531f4f12f67 [359/666] f2fs: support FS_IOC_{GET,SET}FSLABEL config: xtensa-allyesconfig (attached as .config) compiler: xtensa-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 git checkout 2f7cc89b033f4d379139ec47a801a531f4f12f67 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=xtensa 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 >>): In file included from include/linux/kernel.h:10, from include/linux/list.h:9, from include/linux/wait.h:7, from include/linux/wait_bit.h:8, from include/linux/fs.h:6, from fs/f2fs/file.c:8: include/linux/scatterlist.h: In function 'sg_set_buf': arch/xtensa/include/asm/page.h:182:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits] 182 | ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) | ^~ include/linux/compiler.h:77:42: note: in definition of macro 'unlikely' 77 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ include/linux/scatterlist.h:143:2: note: in expansion of macro 'BUG_ON' 143 | BUG_ON(!virt_addr_valid(buf)); | ^~~~~~ arch/xtensa/include/asm/page.h:190:32: note: in expansion of macro 'pfn_valid' 190 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | ^~~~~~~~~ include/linux/scatterlist.h:143:10: note: in expansion of macro 'virt_addr_valid' 143 | BUG_ON(!virt_addr_valid(buf)); | ^~~~~~~~~~~~~~~ In file included from fs/f2fs/file.c:25: fs/f2fs/f2fs.h: In function 'blkaddr_in_node': fs/f2fs/f2fs.h:2280:30: warning: taking address of packed member of 'struct f2fs_inode' may result in an unaligned pointer value [-Waddress-of-packed-member] 2280 | return RAW_IS_INODE(node) ? node->i.i_addr : node->dn.addr; | ^~~~ fs/f2fs/f2fs.h:2280:47: warning: taking address of packed member of 'struct direct_node' may result in an unaligned pointer value [-Waddress-of-packed-member] 2280 | return RAW_IS_INODE(node) ? node->i.i_addr : node->dn.addr; | ^~~~ fs/f2fs/file.c: In function 'f2fs_get_volume_name': 3176 | count = utf16s_to_utf8s(sbi->raw_super->volume_name, | ~~~~~~~~~~~~~~^~~~~~~~~~~~~ fs/f2fs/file.c: In function 'f2fs_set_volume_name': fs/f2fs/file.c:3212:18: warning: taking address of packed member of 'struct f2fs_super_block' may result in an unaligned pointer value [-Waddress-of-packed-member] 3212 | sbi->raw_super->volume_name, | ~~~~~~~~~~~~~~^~~~~~~~~~~~~ # https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-stable.git/c... git remote add f2fs-stable https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-stable.git git fetch --no-tags f2fs-stable linux-4.19.y git checkout 2f7cc89b033f4d379139ec47a801a531f4f12f67 vim +3176 fs/f2fs/file.c 3162 3163 static int f2fs_get_volume_name(struct file *filp, unsigned long arg) 3164 { 3165 struct inode *inode = file_inode(filp); 3166 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 3167 char *vbuf; 3168 int count; 3169 int err = 0; 3170 3171 vbuf = f2fs_kzalloc(sbi, MAX_VOLUME_NAME, GFP_KERNEL); 3172 if (!vbuf) 3173 return -ENOMEM; 3174 3175 down_read(&sbi->sb_lock); 3177 ARRAY_SIZE(sbi->raw_super->volume_name), 3178 UTF16_LITTLE_ENDIAN, vbuf, MAX_VOLUME_NAME); 3179 up_read(&sbi->sb_lock); 3180 3181 if (copy_to_user((char __user *)arg, vbuf, 3182 min(FSLABEL_MAX, count))) 3183 err = -EFAULT; 3184 3185 kvfree(vbuf); 3186 return err; 3187 } 3188 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org