To support large folio swapin/swapout for shmem in the following patches,
drop the folio's reference count by the number of pages contained in the
folio when a shmem folio is deleted from shmem pagecache after adding
into swap cache.

Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
---
 mm/shmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index d94f02ad7bd1..345e25425e37 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -851,7 +851,7 @@ static void shmem_delete_from_page_cache(struct folio *folio, void *radswap)
 	__lruvec_stat_mod_folio(folio, NR_FILE_PAGES, -nr);
 	__lruvec_stat_mod_folio(folio, NR_SHMEM, -nr);
 	xa_unlock_irq(&mapping->i_pages);
-	folio_put(folio);
+	folio_put_refs(folio, nr);
 	BUG_ON(error);
 }
 
-- 
2.39.3