This set is confusing.

Why do you have a cover letter specifying this as a 2 patch set,
yet there are 4 patches attached to it?

I do not see too many messages for this update suggestion.

quoted

From: Markus Elfring <redacted>
Date: Tue, 29 Dec 2015 15:10:48 +0100

What format is this?

Are such specifications needed to preserve the desired authorship information
during the transfer of commit messages by email?

Regards,
Markus