the facts are in between these two.
as I understand it, Andrew doesn't normally use git to send patches to Linus, but at the same time signed off by indicates that the person is vouching for the patch. I don't think that it's done automaticaly by the git scripts (remember, they are used by projects that don't do 'signed off by' lines)
Linus has said many times that his job is more to be a gatekeeper then a coder nowdays, but he still writes and modifies code.
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