diff mbox series

[v2,07/17] mm/page_vma_mapped: device-exclusive entries are not migration entries

Message ID 20250210193801.781278-8-david@redhat.com (mailing list archive)
State New
Headers show
Series mm: fixes for device-exclusive entries (hmm) | expand

Commit Message

David Hildenbrand Feb. 10, 2025, 7:37 p.m. UTC 
It's unclear why they would be considered migration entries; they are
not.

Likely we'll never really trigger that case in practice, because
migration (including folio split) of a folio that has device-exclusive
entries is never started, as we would detect "additional references":
device-exclusive entries adjust the mapcount, but not the refcount.

Fixes: b756a3b5e7ea ("mm: device exclusive memory access")
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 mm/page_vma_mapped.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c
index 81839a9e74f16..32679be22d30c 100644
--- a/mm/page_vma_mapped.c
+++ b/mm/page_vma_mapped.c
@@ -111,8 +111,7 @@  static bool check_pte(struct page_vma_mapped_walk *pvmw)
 			return false;
 		entry = pte_to_swp_entry(ptent);
 
-		if (!is_migration_entry(entry) &&
-		    !is_device_exclusive_entry(entry))
+		if (!is_migration_entry(entry))
 			return false;
 
 		pfn = swp_offset_pfn(entry);