tree: git://git.infradead.org/users/hch/block.git bdi-cleanup head: d4166729c5bb8f318ebea72507522b5ff1ce1b5f commit: 174a8905dd7685265ecf01eb3c3a92dbe9b65e5d [10/15] block: move the block device syncing code from fs/sync.c to block_dev.c config: x86_64-randconfig-c002-20200717 (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 reproduce (this is a W=1 build): git checkout 174a8905dd7685265ecf01eb3c3a92dbe9b65e5d # save the attached .config to linux build tree make W=1 ARCH=x86_64 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/quota/dquot.c:82: 40 | { | ^ fs/quota/../internal.h:39:20: warning: 'fdatawrite_bdevs' declared 'static' but never defined [-Wunused-function] 39 | static inline void fdatawrite_bdevs(void); | ^~~~~~~~~~~~~~~~ vim +40 fs/quota/../internal.h 34 35 static inline int __sync_blockdev(struct block_device *bdev, int wait) 36 { 37 return 0; 38 } 39 static inline void fdatawrite_bdevs(void); 41 } 42 static inline void sync_bdevs(void) 43 { 44 } 45 static inline int emergency_thaw_bdev(struct super_block *sb) 46 { 47 return 0; 48 } 49 static inline void bd_forget(struct inode *inode) 50 { 51 } 52 #endif /* CONFIG_BLOCK */ 53 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org