[I guess this is the wrong place to say so, but folio_undo_large_rmappable()Fully agreed, that is absolutely confusing. (and I thought for a second that the folio would be !large_rmappable afterwards!)
is a dreadful name: it completely obscures what the function actually does,
and gives the false impression that the folio would be !large_rmappable
afterwards. I hope that one day the name gets changed to something like
folio_unqueue_deferred_split() or folio_cancel_deferred_split().]