[PATCH] mm: make sure isolate_lru_page() is never called for tail page

["Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>]

The VM_BUG_ON_PAGE() would catch such cases if any still exists.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
 mm/vmscan.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 964390906167..05dd182f04fd 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1436,6 +1436,7 @@ int isolate_lru_page(struct page *page)
 	int ret = -EBUSY;
 
 	VM_BUG_ON_PAGE(!page_count(page), page);
+	VM_BUG_ON_PAGE(PageTail(page), page);
 
 	if (PageLRU(page)) {
 		struct zone *zone = page_zone(page);
-- 
2.6.2

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