On 05.03.24 17:19, Zi Yan wrote:
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.
Corresponding swapcache entries need to be updated as well. e71769ae5260 ("mm: enable thp migration for shmem thp") fixed it already.
Fixes: 616b8371539a ("mm: thp: enable thp migration in generic path")
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 c7d5566623ad..c37af50f312d 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -424,8 +424,12 @@ int migrate_page_move_mapping(struct address_space *mapping, if (PageSwapBacked(page)) { __SetPageSwapBacked(newpage); if (PageSwapCache(page)) {
int i;SetPageSwapCache(newpage);
set_page_private(newpage, page_private(page));
for (i = 0; i < (1 << compound_order(page)); i++)set_page_private(newpage + i,page_private(page + i));
Acked-by: David Hildenbrand david@redhat.com