tree: https://github.com/rhvgoyal/linux virtiofs-dax-5.8 head: b779919ca8c764c6664523cba2f8dc7fdb4b29d8 commit: ca29952d27ecbcaa6cfb7c34131742aa70eb06cc [13/20] fuse, dax: Implement dax read/write operations config: openrisc-randconfig-s031-20200717 (attached as .config) compiler: or1k-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-49-g707c5017-dirty git checkout ca29952d27ecbcaa6cfb7c34131742aa70eb06cc # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=openrisc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from fs/fuse/file.c:22: include/linux/iomap.h: In function 'iomap_sector': 95 | return (iomap->addr + pos - iomap->offset) >> SECTOR_SHIFT; | ^~~~~~~~~~~~ | S_DT_SHIFT include/linux/iomap.h:95:48: note: each undeclared identifier is reported only once for each function it appears in At top level: fs/fuse/file.c:2899:12: warning: 'fuse_dax_mmap' defined but not used [-Wunused-function] 2899 | static int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma) | ^~~~~~~~~~~~~ vim +95 include/linux/iomap.h 63899c6f8851c3 Christoph Hellwig 2018-06-19 91 db074436f42196 Darrick J. Wong 2019-07-15 92 static inline sector_t db074436f42196 Darrick J. Wong 2019-07-15 93 iomap_sector(struct iomap *iomap, loff_t pos) db074436f42196 Darrick J. Wong 2019-07-15 94 { db074436f42196 Darrick J. Wong 2019-07-15 @95 return (iomap->addr + pos - iomap->offset) >> SECTOR_SHIFT; db074436f42196 Darrick J. Wong 2019-07-15 96 } db074436f42196 Darrick J. Wong 2019-07-15 97 :::::: The code at line 95 was first introduced by commit :::::: db074436f421967f4f30cfbb6fbc2a728f3e62b3 iomap: move the direct IO code into a separate file :::::: TO: Darrick J. Wong <darrick.wong(a)oracle.com&gt; :::::: CC: Darrick J. Wong <darrick.wong(a)oracle.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org