We are about to allow swap storage of any mTHP size. To prepare for
that, let's change get_swap_pages() to take a folio order parameter
instead of nr_pages. This makes the interface self-documenting; a
power-of-2 number of pages must be provided. We will also need the order
internally so this simplifies accessing it.
Reviewed-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx>
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