mm/damon/paddr: fix folio_nr_pages() after folio_put() in damon_pa_ma…

…rk_accessed_or_deactivate()

damon_pa_mark_accessed_or_deactivate() is accessing a folio via
folio_nr_pages() after folio_put() for the folio has invoked.  Fix it.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: f70da5e ("mm/damon: convert damon_pa_mark_accessed_or_deactivate() to use folios")
Signed-off-by: SeongJae Park <[email protected]>
Reviewed-by: Kefeng Wang <[email protected]>
Reviewed-by: Matthew Wilcox (Oracle) <[email protected]>
Cc: Vishal Moola (Oracle) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

mm/damon/paddr.c

@@ -280,8 +280,8 @@ static inline unsigned long damon_pa_mark_accessed_or_deactivate(
 			folio_mark_accessed(folio);
 		else
 			folio_deactivate(folio);
-		folio_put(folio);
 		applied += folio_nr_pages(folio);
+		folio_put(folio);
 	}
 	return applied * PAGE_SIZE;
 }