Hi Stanislav,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on net-next/master]
[also build test ERROR on v4.17-rc1 next-20180420]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Stanislav-Kinsburskii/Introduce-Xen-fault-injection-facility/20180422-201946
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/block//xen-blkback/blkback_fi.c: In function 'xen_blkif_fi_init':
>> drivers/block//xen-blkback/blkback_fi.c:87:51: error: dereferencing pointer to incomplete type 'struct backend_info'
     bfi->dir = debugfs_create_dir(dev_name(&blkif->be->dev->dev),
                                                      ^~

vim +87 drivers/block//xen-blkback/blkback_fi.c

    77	
    78	int xen_blkif_fi_init(struct xen_blkif *blkif)
    79	{
    80		struct xen_blkif_fi *bfi;
    81		int fi, err = -ENOMEM;
    82	
    83		bfi = kmalloc(sizeof(*bfi), GFP_KERNEL);
    84		if (!bfi)
    85			return -ENOMEM;
    86	
  > 87		bfi->dir = debugfs_create_dir(dev_name(&blkif->be->dev->dev),
    88					      blkif_fi_dir);
    89		if (!bfi->dir)
    90			goto err_dir;
    91	
    92		for (fi = 0; fi < XENBLKIF_FI_MAX; fi++) {
    93			bfi->faults[fi] = xen_fi_dir_add(bfi->dir,
    94							 xen_blkif_fi_names[fi]);
    95			if (!bfi->faults[fi])
    96				goto err_fault;
    97		}
    98	
    99		blkif->fi_info = bfi;
   100		return 0;
   101	
   102	err_fault:
   103		for (; fi > 0; fi--)
   104			xen_fi_del(bfi->faults[fi]);
   105		debugfs_remove_recursive(bfi->dir);
   106	err_dir:
   107		kfree(bfi);
   108		return err;
   109	}
   110	

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