The patch titled
Subject: mm: verify compound order when freeing a page
has been added to the -mm tree. Its filename is
mm-verify-compound-order-when-freeing-a-page.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-verify-compound-order-when-freeing-a-page.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-verify-compound-order-when-freeing-a-page.patch
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------------------------------------------------------
From: Yu Zhao <yuzhao@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Bob Liu <lliubbo@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN mm/page_alloc.c~mm-verify-compound-order-when-freeing-a-page mm/page_alloc.c
--- a/mm/page_alloc.c~mm-verify-compound-order-when-freeing-a-page
+++ a/mm/page_alloc.c
@@ -750,6 +750,9 @@ static bool free_pages_prepare(struct pa
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);
_
Patches currently in -mm which might be from yuzhao@xxxxxxxxxx are
mm-free-compound-page-with-correct-order.patch
mm-verify-compound-order-when-freeing-a-page.patch
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