mm: swap: make should_try_to_free_swap() support large-folio

The function should_try_to_free_swap() operates under the assumption that
swap-in always occurs at the normal page granularity, i.e.,
folio_nr_pages() = 1.  However, in reality, for large folios,
add_to_swap_cache() will invoke folio_ref_add(folio, nr).  To accommodate
large folio swap-in, this patch eliminates this assumption.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Chuanhua Han <[email protected]>
Co-developed-by: Barry Song <[email protected]>
Signed-off-by: Barry Song <[email protected]>
Acked-by: Chris Li <[email protected]>
Reviewed-by: Ryan Roberts <[email protected]>
Reviewed-by: "Huang, Ying" <[email protected]>
Reviewed-by: David Hildenbrand <[email protected]>
Cc: Andreas Larsson <[email protected]>
Cc: Baolin Wang <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Gao Xiang <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Kairui Song <[email protected]>
Cc: Khalid Aziz <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Pavel Machek <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Yosry Ahmed <[email protected]>
Cc: Yu Zhao <[email protected]>
Cc: Zi Yan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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