tree: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git feature/dax head: d08999836fd60ab725eee1f5a5fb3b00f7bcefd3 commit: ddf2be0f55254d0a1a8bc51f2c1597c09b1dd2aa [8/9] f2fs: handle layout changes to pinned DAX mappings config: mips-randconfig-r002-20211220 (https://download.01.org/0day-ci/archive/20211221/202112210031.prMeKhRK-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 683cbc12b33e5c8dc8d29bf5ed79fbf45763aadd) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git/commit/?id... git remote add chao https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git git fetch --no-tags chao feature/dax git checkout ddf2be0f55254d0a1a8bc51f2c1597c09b1dd2aa # 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=mips SHELL=/bin/bash fs/f2fs/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): fs/f2fs/file.c:584:7: error: implicit declaration of function 'daxdev_mapping_supported' [-Werror,-Wimplicit-function-declaration] if (!daxdev_mapping_supported(vma, F2FS_I_SB(inode)->s_daxdev)) ^ page = dax_layout_busy_page(inode->i_mapping); ^ page = dax_layout_busy_page(inode->i_mapping); ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1 warning and 2 errors generated. vim +/dax_layout_busy_page +1106 fs/f2fs/file.c 1096 1097 int f2fs_break_layouts(struct inode *inode) 1098 { 1099 struct page *page; 1100 int error; 1101 1102 if (WARN_ON_ONCE(!rwsem_is_locked(&inode->i_mapping->invalidate_lock))) 1103 return -EINVAL; 1104 1105 do { 1107 if (!page) 1108 return 0; 1109 1110 error = ___wait_var_event(&page->_refcount, 1111 atomic_read(&page->_refcount) == 1, 1112 TASK_INTERRUPTIBLE, 0, 0, 1113 f2fs_wait_dax_page(inode)); 1114 } while (error == 0); 1115 1116 return error; 1117 } 1118 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org