[PATCH 1/3] mm: set folio swapbacked iff folios are dirty in try_to_unmap_one

[Baolin Wang]

On 2025/1/6 11:17, Barry Song wrote:
> From: Barry Song <v-songbaohua at oppo.com>
> 
> The refcount may be temporarily or long-term increased, but this does
> not change the fundamental nature of the folio already being lazy-
> freed. Therefore, we only reset 'swapbacked' when we are certain the
> folio is dirty and not droppable.
> 
> Suggested-by: David Hildenbrand <david at redhat.com>
> Signed-off-by: Barry Song <v-songbaohua at oppo.com>

The changes look good to me. While we are at it, could you also change 
the __discard_anon_folio_pmd_locked() to follow the same strategy for 
lazy-freed PMD-sized folio?