The quilt patch titled
Subject: mm/migrate_device: try to handle swapcache pages
has been removed from the -mm tree. Its filename was
mm-migrate_device-try-to-handle-swapcache-pages.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Mika Penttilä <mpenttil@xxxxxxxxxx>
Subject: mm/migrate_device: try to handle swapcache pages
Date: Wed, 7 Jun 2023 20:29:44 +0300
Migrating file pages and swapcache pages into device memory is not
supported. Try to get rid of the swap cache, and if successful, go ahead
as with other anonymous pages.
Link: https://lkml.kernel.org/r/20230607172944.11713-1-mpenttil@xxxxxxxxxx
Signed-off-by: Mika Penttilä <mpenttil@xxxxxxxxxx>
Reviewed-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Reviewed-by: Alistair Popple <apopple@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Ralph Campbell <rcampbell@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate_device.c | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)
--- a/mm/migrate_device.c~mm-migrate_device-try-to-handle-swapcache-pages
+++ a/mm/migrate_device.c
@@ -727,13 +727,22 @@ static void __migrate_device_pages(unsig
if (is_device_private_page(newpage) ||
is_device_coherent_page(newpage)) {
- /*
- * For now only support anonymous memory migrating to
- * device private or coherent memory.
- */
if (mapping) {
- src_pfns[i] &= ~MIGRATE_PFN_MIGRATE;
- continue;
+ struct folio *folio;
+
+ folio = page_folio(page);
+
+ /*
+ * For now only support anonymous memory migrating to
+ * device private or coherent memory.
+ *
+ * Try to get rid of swap cache if possible.
+ */
+ if (!folio_test_anon(folio) ||
+ !folio_free_swap(folio)) {
+ src_pfns[i] &= ~MIGRATE_PFN_MIGRATE;
+ continue;
+ }
}
} else if (is_zone_device_page(newpage)) {
/*
_
Patches currently in -mm which might be from mpenttil@xxxxxxxxxx are
