How to make a patch ?

[Masashi Honma]

Hello.

This is a elementary question.

I have made my patch by following procedure.

1. get current code by "git clone git://w1.fi/srv/git/hostap.git" command
2. change files
3. make patch by "git diff" command

But now I think this is not a standard way. Because this way doesn't
generate "Signed-hostap" line.

What is a standard way to make a patch ?

Regards,
Masashi Honma