Some sub-systems rebase, and some do not.
It is up to the sub-system maintainer.

We used to have a very strict rule to not rebase anything which ends up
in linux-next. Dunno what happened to this rule but I liked it.

I know what you are saying, but this is how we develop in linux-next.

I wonder about that...

You need to use "git rebase --onto".

And what about lists with commit IDs tracking patches on their way
upstream? Yes, there is git-patch-id, yet I think it is easier to admit
that incremental changes happen anyway. I know Ulf view differs...

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