fs/cramfs/inode.c:698: undefined reference to `mount_mtd'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 
master
head:   e1d1ea549b57790a3d8cf6300e6ef86118d692a3
commit: 99c18ce580c6cc6763e694b4ce320d7b226ab59b cramfs: direct memory access 
support
date:   5 weeks ago
config: i386-randconfig-i1-201747 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        git checkout 99c18ce580c6cc6763e694b4ce320d7b226ab59b
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   fs/cramfs/inode.o: In function `cramfs_mount':
>> fs/cramfs/inode.c:698: undefined reference to `mount_mtd'
   fs/cramfs/inode.o: In function `cramfs_mtd_fill_super':
>> fs/cramfs/inode.c:432: undefined reference to `mtd_point'
>> fs/cramfs/inode.c:449: undefined reference to `mtd_unpoint'
   fs/cramfs/inode.c:450: undefined reference to `mtd_point'

vim +698 fs/cramfs/inode.c

   691  
   692  static struct dentry *cramfs_mount(struct file_system_type *fs_type, 
int flags,
   693                                     const char *dev_name, void *data)
   694  {
   695          struct dentry *ret = ERR_PTR(-ENOPROTOOPT);
   696  
   697          if (IS_ENABLED(CONFIG_CRAMFS_MTD)) {
 > 698                  ret = mount_mtd(fs_type, flags, dev_name, data,
   699                                  cramfs_mtd_fill_super);
   700                  if (!IS_ERR(ret))
   701                          return ret;
   702          }
   703          if (IS_ENABLED(CONFIG_CRAMFS_BLOCKDEV)) {
   704                  ret = mount_bdev(fs_type, flags, dev_name, data,
   705                                   cramfs_blkdev_fill_super);
   706          }
   707          return ret;
   708  }
   709  

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