From: Zi Yan ziy@nvidia.com
The tail pages in a THP can have swap entry information stored in their private field. When migrating to a new page, all tail pages of the new page need to update ->private to avoid future data corruption.
Signed-off-by: Zi Yan ziy@nvidia.com --- mm/migrate.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/mm/migrate.c b/mm/migrate.c index c93dd6a31c31..c5968021fde0 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -423,8 +423,12 @@ int folio_migrate_mapping(struct address_space *mapping, if (folio_test_swapbacked(folio)) { __folio_set_swapbacked(newfolio); if (folio_test_swapcache(folio)) { + int i; + folio_set_swapcache(newfolio); - newfolio->private = folio_get_private(folio); + for (i = 0; i < nr; i++) + set_page_private(folio_page(newfolio, i), + page_private(folio_page(folio, i))); } entries = nr; } else {