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Date:	Tue, 14 Oct 2014 13:16:40 -0700
From:	Yu Zhao <>
To:	Andrew Morton <>,
	"Kirill A. Shutemov" <>,
	Mel Gorman <>, Rik van Riel <>,
	Ingo Molnar <>,
	Hugh Dickins <>,
	Sasha Levin <>,
	Bob Liu <>,
	Johannes Weiner <>,
	David Rientjes <>,
	Vlastimil Babka <>
	Yu Zhao <>
Subject: [PATCH 2/2] mm: verify compound order when freeing a page

This allows us to easily catch the bug fixed in previous patch.

Here we also verify whether a page is tail page or not -- tail
pages are supposed to be freed along with their head, not by

Signed-off-by: Yu Zhao <>
 mm/page_alloc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 736d8e1..2bcc770 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -750,6 +750,9 @@ static bool free_pages_prepare(struct page *page, unsigned int order)
 	int i;
 	int bad = 0;
+	VM_BUG_ON(PageTail(page));
+	VM_BUG_ON(PageHead(page) && compound_order(page) != order);
 	trace_mm_page_free(page, order);
 	kmemcheck_free_shadow(page, order);

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