Just to confirm a recent answer to questions on lkml ...
1) There is no way to send a particular changeset from the "middle" of a
set from one tree to another, without exporting it as a patch or
rebuilding a new git tree. I have two changesets that, after testing
last week, I now consider more important to send upstream than the few
earlier and later changesets. If I export those two changesets as
patches, and send them on. presumably I lose the changset comments etc.
and then when the upstream tree is merged back, it might look a little
odd in the changeset history.
2) There is no way to update the comment field of a changeset after it
goes in (e.g. to add a bugzilla bug number for a bug that was opened
just after the fix went in).
3) There is no way to do a test commit of an individual changeset
against a specified tree (to make sure it would still merge cleanly,
automatically).
Are there easier ways to do any of these?