mm: list_lru: mark expected switch fall-through

In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through.

---
This code was tested by compilation only (GCC 7.2.0 was used). Please, verify if the actual intention of the code is to fall through.

 mm/list_lru.c | 1 +
 1 file changed, 1 insertion(+)

index f8c7de8..278db98 100644
@@ -222,6 +222,7 @@ __list_lru_walk_one(struct list_lru *lru, int nid, int memcg_idx,
 		switch (ret) {
 		case LRU_REMOVED_RETRY:
 			assert_spin_locked(&nlru->lock);
+			/* fall through */
 		case LRU_REMOVED:
 			isolated++;
 			nlru->nr_items--;

2.7.4

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