Wow I am sorry, Gmail apparently moved your reply to spam and I only
got it when I posted my message just now.
Do you know what causes these whitespace errors, so I can avoid them
next time? I think I'm generating my patches rather normally, with
$(git format-patch -12 --subject-prefix="PATCH v4 net-next"
--cover-letter).

What happens when you run checkpatch on the patches? Does it report
white space problems.

Another possibility is your email system has mangled the patches.
First try applying the patches you generated from format-patch to a
clean tree. If you don't get any warnings, email the patches to
yourself, and then apply them.

     Andrew