Failed to backport from from Linux 4.4 drivers to Linux 3.10.108

[Masashi Honma <masashi.honma@gmail.com>]

I am trying to backport from Linux 4.4 drivers to Linux 3.10.108 with 
backports.

These are my commands.
----
$ cd ~/git
$ git clone 
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git

$ cd ~/git
$ git clone 
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
$ cd linux-stable
$ git checkout v3.10.108

$ cd ~/git
$ git clone 
git://git.kernel.org/pub/scm/linux/kernel/git/backports/backports.git
$ cd backports
$ git checkout linux-4.4.y
$ ./gentree.py --copy-list ./copy-list --integrate --clean 
--git-revision v4.4 ~/git/linux-next ~/git/linux-stable
----

The gentree.py command resulted in these messages.
----
Get original source files from git ...
Applying patches from patches to /home/honma/git/linux-stable/backports/ ...
Failed to process SmPL patch 
collateral-evolutions/network/0027-genl-const/genl-const.cocci
Traceback (most recent call last):
   File "./gentree.py", line 1091, in <module>
     ret = _main()
   File "./gentree.py", line 724, in _main
     logwrite=logwrite)
   File "./gentree.py", line 906, in process
     apply_patches(args, "backport", source_dir, 'patches', 
bpid.target_dir, logwrite)
   File "./gentree.py", line 605, in apply_patches
     raise Exception('SmPL patch failed')
Exception: SmPL patch failed
----

Is this caused by my invalid procedure ?
If so, please tell me right way.

Regards,
Masashi Honma.
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