drivers/infiniband/hw/mlx5/main.c:4555: undefined reference to `uverbs_default_get_objects'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   18b7fd1c93e5204355ddbf2608a097d64df81b88
commit: 8c84660bb437fe8692e6a2b4e85023ccb874a520 IB/mlx5: Initialize the parsing tree root without the help of uverbs
date:   10 days ago
config: x86_64-randconfig-s5-04150714 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout 8c84660bb437fe8692e6a2b4e85023ccb874a520
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/infiniband/hw/mlx5/main.o: In function `populate_specs_root':
>> drivers/infiniband/hw/mlx5/main.c:4555: undefined reference to `uverbs_default_get_objects'
>> drivers/infiniband/hw/mlx5/main.c:4559: undefined reference to `uverbs_alloc_spec_tree'
   drivers/infiniband/hw/mlx5/main.o: In function `depopulate_specs_root':
>> drivers/infiniband/hw/mlx5/main.c:4566: undefined reference to `uverbs_free_spec_tree'

vim +4555 drivers/infiniband/hw/mlx5/main.c

  4550	
  4551	#define NUM_TREES	0
  4552	static int populate_specs_root(struct mlx5_ib_dev *dev)
  4553	{
  4554		const struct uverbs_object_tree_def *default_root[NUM_TREES + 1] = {
> 4555			uverbs_default_get_objects()};
  4556		size_t num_trees = 1;
  4557	
  4558		dev->ib_dev.specs_root =
> 4559			uverbs_alloc_spec_tree(num_trees, default_root);
  4560	
  4561		return PTR_ERR_OR_ZERO(dev->ib_dev.specs_root);
  4562	}
  4563	
  4564	static void depopulate_specs_root(struct mlx5_ib_dev *dev)
  4565	{
> 4566		uverbs_free_spec_tree(dev->ib_dev.specs_root);
  4567	}
  4568	

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