[PATCH 2/3] lumpy: back out removal of active check in isolate_lru_pages

[Andy Whitcroft]

As pointed out by Christop Lameter it should not be possible for a
page to change its active/inactive state without taking the lru_lock.
Reinstate this safety net.

Signed-off-by: Andy Whitcroft <apw@xxxxxxxxxxxx>
Acked-by: Mel Gorman <mel@xxxxxxxxx>
---
diff --git a/mm/vmscan.c b/mm/vmscan.c
index bda63a0..d7a0860 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -691,10 +691,13 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan,
 			nr_taken++;
 			break;
 
-		default:
-			/* page is being freed, or is a missmatch */
+		case -EBUSY:
+			/* else it is being freed elsewhere */
 			list_move(&page->lru, src);
 			continue;
+
+		default:
+			BUG();
 		}
 
 		if (!order)
-
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