tree: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git io_uring-fops.v7 head: 733ce76b0107afe87534cfdd5403594ccef3bbe9 commit: e9640aeebe88d42bf792d7ad773498d7f001b453 [6/8] block: add example ioctl config: um-x86_64_defconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/commit/?id=e9640aeebe88d42bf792d7ad773498d7f001b453 git remote add block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git git fetch --no-tags block io_uring-fops.v7 git checkout e9640aeebe88d42bf792d7ad773498d7f001b453 # save the attached .config to linux build tree make W=1 ARCH=um SUBARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot All errors (new ones prefixed by >>): fs/block_dev.c: In function 'blkdev_async_cmd': >> fs/block_dev.c:344:10: error: implicit declaration of function 'blkdev_uring_ioctl'; did you mean 'blkdev_async_ioctl'? [-Werror=implicit-function-declaration] 344 | return blkdev_uring_ioctl(bdev, cmd); | ^~~~~~~~~~~~~~~~~~ | blkdev_async_ioctl At top level: fs/block_dev.c:324:12: warning: 'blkdev_async_ioctl' defined but not used [-Wunused-function] 324 | static int blkdev_async_ioctl(struct block_device *bdev, | ^~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +344 fs/block_dev.c 336 337 static int blkdev_async_cmd(struct io_uring_cmd *cmd, 338 enum io_uring_cmd_flags flags) 339 { 340 struct block_device *bdev = I_BDEV(cmd->file->f_mapping->host); 341 342 switch (cmd->op) { 343 case BLOCK_URING_OP_IOCTL: > 344 return blkdev_uring_ioctl(bdev, cmd); 345 default: 346 break; 347 } 348 349 return blk_uring_cmd(bdev, cmd, flags); 350 } 351 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org