[RFC PATCH v4 1/6] migrate: Allow migrate_misplaced_folio_prepare() to accept a NULL VMA.

[Gregory Price]

migrate_misplaced_folio_prepare() may be called on a folio without
a VMA, and so it must be made to accept a NULL VMA.

Suggested-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Gregory Price <gourry@xxxxxxxxxx>
---
 mm/migrate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index f3ee6d8d5e2e..047131f6c839 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2654,7 +2654,7 @@ int migrate_misplaced_folio_prepare(struct folio *folio,
 		 * See folio_maybe_mapped_shared() on possible imprecision
 		 * when we cannot easily detect if a folio is shared.
 		 */
-		if ((vma->vm_flags & VM_EXEC) && folio_maybe_mapped_shared(folio))
+		if (vma && (vma->vm_flags & VM_EXEC) && folio_maybe_mapped_shared(folio))
 			return -EACCES;
 
 		/*
-- 
2.49.0