1 files changed, 6 insertions, 0 deletions
diff --git a/mm/internal.h b/mm/internal.h
index 7bc26553079d..5758dcaf4392 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -874,6 +874,12 @@ struct compact_control {
 struct capture_control {
 	struct zone *zone;
 	int migratetype;
+	/*
+	 * Allocation request order. May differ from the compaction
+	 * order: defrag_mode promotes sub-block allocations to
+	 * pageblock-order compaction; capture still matches at the
+	 * original allocation order so prep_new_page() is consistent.
+	 */
 	int order;
 	struct page *page;
 };