undefined reference to `mlx5_cqwq_create'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   21c19bc7ee256094aba74af8d91a824da4bc36af
commit: 537a50574175a2b68b0612ffb48cb044a394c7b4 net/mlx5: FPGA, Add high-speed connection routines
date:   10 days ago
config: i386-randconfig-x012-07071743 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 537a50574175a2b68b0612ffb48cb044a394c7b4
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `mlx5_fpga_conn_create_qp':
   conn.c:(.text+0x64aa77): undefined reference to `mlx5_wq_qp_create'
   conn.c:(.text+0x64acd4): undefined reference to `mlx5_wq_destroy'
   drivers/built-in.o: In function `mlx5_fpga_conn_destroy_cq':
   conn.c:(.text+0x64ad89): undefined reference to `mlx5_cqwq_destroy'
   drivers/built-in.o: In function `mlx5_fpga_conn_destroy_qp':
   conn.c:(.text+0x64af94): undefined reference to `mlx5_wq_destroy'
   drivers/built-in.o: In function `mlx5_fpga_conn_create':
>> (.text+0x64bbd2): undefined reference to `mlx5_cqwq_create'
   drivers/built-in.o: In function `mlx5_fpga_conn_create':
>> (.text+0x64bc25): undefined reference to `mlx5_cqwq_get_size'
   drivers/built-in.o: In function `mlx5_fpga_conn_create':
>> (.text+0x64bd54): undefined reference to `mlx5_cqwq_destroy'

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