Re: [PATCH STABLE v6.1.y] mm/migrate: set swap entry values of THP tail pages properly.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 05.03.24 17:13, Zi Yan wrote:
From: Zi Yan <ziy@xxxxxxxxxx>

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@xxxxxxxxxx>
---
  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 {

Hopefully Charan can run the reproducer against this.

Acked-by: David Hildenbrand <david@xxxxxxxxxx>

--
Cheers,

David / dhildenb





[Index of Archives]     [Linux Kernel]     [Kernel Development Newbies]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Hiking]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux