mm: verify compound order when freeing a page
This allows us to catch the bug fixed in the previous patch (mm: free
compound page with correct order).
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 themselves.
Signed-off-by: Yu Zhao <yuzhao@google.com>
Reviewed-by: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: David Rientjes <rientjes@google.com>
Cc: Bob Liu <lliubbo@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f3a6bf1..b7c18f0 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -741,6 +741,9 @@
int i;
int bad = 0;
+ VM_BUG_ON_PAGE(PageTail(page), page);
+ VM_BUG_ON_PAGE(PageHead(page) && compound_order(page) != order, page);
+
trace_mm_page_free(page, order);
kmemcheck_free_shadow(page, order);