Junio C Hamano [off-list ref] writes:
Then under the "--no-ff activates the magic" rule:
git merge v3.9-rc2
will fast-forward, but this
git merge --no-ff v3.9-rc2
creates a real merge with the "mergetag" signature block. The one
that caused trouble in the "security tree", i.e.
git pull linus v3.9-rc2
or its equivalent
git fetch linus v3.9-rc2
git merge FETCH_HEAD
would still fast-forward under this rule. The maintainer needs to
do
git pull --no-ff git://git.kernel.org/... for-linus
if the pull could fast-forward under this rule, though.
Scratch the last sentence. It should have been
"whether the pull fast-forwards or not". You'd always need to.