[block:io_uring-fops.v7 6/9] fops.c:undefined reference to `blk_async_cmd'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git io_uring-fops.v7
head:   ac5c317c6de0ac90cefd2ba455107bf89eb5ae3c
commit: ca82263d596754e398cc2ad585c56af6e98fa808 [6/9] block: wire up support for file_operations->uring_cmd()
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=ca82263d596754e398cc2ad585c56af6e98fa808
        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 ca82263d596754e398cc2ad585c56af6e98fa808
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=um SUBARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All error/warnings (new ones prefixed by >>):

   /usr/bin/ld: block/fops.o: in function `blkdev_async_cmd':
>> fops.c:(.text+0x1b2): undefined reference to `blk_async_cmd'
   collect2: error: ld returned 1 exit status
--
>> block/blk-mq.c:4004:5: warning: no previous prototype for 'blk_uring_cmd' [-Wmissing-prototypes]
    4004 | int blk_uring_cmd(struct block_device *bdev, struct io_uring_cmd *cmd,
         |     ^~~~~~~~~~~~~

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Attachment: .config.gz
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