tree:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-5.6/io_uring
head:   fd4be9bbc3f977f9e89056b93e0c6b1249a0ae0f
commit: fd4be9bbc3f977f9e89056b93e0c6b1249a0ae0f [45/45] io_uring: add IORING_OP_MADVISE
config: x86_64-randconfig-b001-20191225 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-3) 7.5.0
reproduce:
        git checkout fd4be9bbc3f977f9e89056b93e0c6b1249a0ae0f
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   ld: fs/io_uring.o: in function `io_madvise':
>> fs/io_uring.c:2475: undefined reference to `do_madvise'

vim +2475 fs/io_uring.c

  2465	
  2466	static int io_madvise(struct io_kiocb *req, struct io_kiocb **nxt,
  2467			      bool force_nonblock)
  2468	{
  2469		struct io_fadvise *fa = &req->fadvise;
  2470		int ret;
  2471	
  2472		if (force_nonblock)
  2473			return -EAGAIN;
  2474	
> 2475		ret = do_madvise(fa->addr, fa->len, fa->advice);
  2476		if (ret < 0)
  2477			req_set_fail_links(req);
  2478		io_cqring_add_event(req, ret);
  2479		io_put_req_find_next(req, nxt);
  2480		return 0;
  2481	}
  2482	

---
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