tree: git://git.infradead.org/users/hch/block.git block-fs.h-cleanup head: 48ca5ac96538719d7dd6557513b98d6c505a423e commit: 853dbdee39f151c64a01e921b49f651251adcf69 [5/8] fs: move block-related definitions out of fs.h config: i386-tinyconfig (attached as .config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce: git checkout 853dbdee39f151c64a01e921b49f651251adcf69 # save the attached .config to linux build tree make ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; Note: the hch-block/block-fs.h-cleanup HEAD 48ca5ac96538719d7dd6557513b98d6c505a423e builds fine. It only hurts bisectibility. All errors (new ones prefixed by >>): In file included from include/linux/blk-cgroup.h:23:0, from include/linux/writeback.h:14, from include/linux/memcontrol.h:22, from include/linux/swap.h:9, from include/linux/suspend.h:5, from arch/x86/kernel/asm-offsets.c:13: include/linux/blkdev.h: In function 'blk_io_schedule': include/linux/blkdev.h:1857:26: error: 'sysctl_hung_task_timeout_secs' undeclared (first use in this function) unsigned long timeout = sysctl_hung_task_timeout_secs * HZ / 2; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/blkdev.h:1857:26: note: each undeclared identifier is reported only once for each function it appears in include/linux/blkdev.h: At top level: }: ^ make[2]: *** [scripts/Makefile.build:100: arch/x86/kernel/asm-offsets.s] Error 1 make[2]: Target '__build' not remade because of errors. make[1]: *** [Makefile:1141: prepare0] Error 2 make[1]: Target 'prepare' not remade because of errors. make: *** [Makefile:180: sub-make] Error 2 vim +1931 include/linux/blkdev.h 1922 1923 extern struct super_block *blockdev_superblock; 1924 static inline bool sb_is_blkdev_sb(struct super_block *sb) 1925 { 1926 return sb == blockdev_superblock; 1927 } 1928 #else 1929 void invalidate_bdev(struct block_device *bdev) 1930 { 1932 static inline void bd_forget(struct inode *inode) 1933 { 1934 } 1935 static inline bool sb_is_blkdev_sb(struct super_block *sb) 1936 { 1937 return false; 1938 } 1939 #endif /* CONFIG_BLOCK */ 1940 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org