1 files changed, 15 insertions, 0 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index b0fbfdfad298..da25b5a2e476 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -295,10 +295,25 @@ static unsigned long isolate_migratepages(struct zone *zone,
 			continue;
 		}
 
+		if (!PageLRU(page))
+			continue;
+
+		/*
+		 * PageLRU is set, and lru_lock excludes isolation,
+		 * splitting and collapsing (collapsing has already
+		 * happened if PageLRU is set).
+		 */
+		if (PageTransHuge(page)) {
+			low_pfn += (1 << compound_order(page)) - 1;
+			continue;
+		}
+
 		/* Try isolate the page */
 		if (__isolate_lru_page(page, ISOLATE_BOTH, 0) != 0)
 			continue;
 
+		VM_BUG_ON(PageTransCompound(page));
+
 		/* Successfully isolated */
 		del_page_from_lru_list(zone, page, page_lru(page));
 		list_add(&page->lru, migratelist);