determine a linux kernel version of a patch file

Hi,

At the beginning I'm sorry if this post is completely unrelated to
this mailing list.
I'm trying to find the base linux kernel version from which a patch
has been created and posted to LKML.
Most patches contain the index line. Is it the well known git index
(staging area) ?
Can I use the index to find the exact kernel version from which a
patch was created.
Please look at an example patch sent to LKML:
https://lkml.org/lkml/2015/5/14/497

It contains the following index line:
index 8dd1e55..9b0c81e 100644

I tried to find it using "git log" but I couldn't.

Please help me to determine the exact kernel version.

thanks in advance