tree: git://git.infradead.org/users/hch/block.git blk-accounting-cleanup head: 426c2d7f0c7434a57d66be949f1c20e87f8f94ac commit: 6affa383c213074810553ceb6d97493a9404f09c [1/16] block: add disk/bio-based accounting helpers config: nds32-allnoconfig (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 git checkout 6affa383c213074810553ceb6d97493a9404f09c # 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: kbuild test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>, old ones prefixed by <<): In file included from include/linux/backing-dev.h:15, from fs//ramfs/inode.c:32: include/linux/blkdev.h: In function 'bio_start_io_acct': 1908 | return disk_start_io_acct(bio->bi_disk, bio_sectors(bio), bio_op(bio)); | ^~ include/linux/blkdev.h:1908:42: error: implicit declaration of function 'bio_sectors' [-Werror=implicit-function-declaration] 1908 | return disk_start_io_acct(bio->bi_disk, bio_sectors(bio), bio_op(bio)); | ^~~~~~~~~~~ 1908 | return disk_start_io_acct(bio->bi_disk, bio_sectors(bio), bio_op(bio)); | ^~~~~~ include/linux/blkdev.h: In function 'bio_end_io_acct': 1918 | return disk_end_io_acct(bio->bi_disk, bio_op(bio), start_time); | ^~~~~~~~~~~~~~~~ include/linux/blkdev.h:1916:20: note: declared here 1916 | static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) | ^~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +1908 include/linux/blkdev.h 1894 1895 unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, 1896 unsigned int op); 1897 void disk_end_io_acct(struct gendisk *disk, unsigned int op, 1898 unsigned long start_time); 1899 1900 /** 1901 * bio_start_io_acct - start I/O accounting for bio based drivers 1902 * @bio: bio to start account for 1903 * 1904 * Returns the start time that should be passed back to bio_end_io_acct(). 1905 */ 1906 static inline unsigned long bio_start_io_acct(struct bio *bio) 1907 { 1909 } 1910 1911 /** 1912 * bio_end_io_acct - end I/O accounting for bio based drivers 1913 * @bio: bio to end account for 1914 * @start: start time returned by bio_start_io_acct() 1915 */ 1916 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) 1917 { 1919 } 1920 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org