linux-kernel - [PATCH 4/4] hugetlb, rmap: add BUG_ON(!PageLocked) in hugetlb_add_anon

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Message-Id: <1284092586-1179-5-git-send-email-n-horiguchi@ah.jp.nec.com>
Date:	Fri, 10 Sep 2010 13:23:06 +0900
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Lameter <cl@...ux.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <andi@...stfloor.org>, linux-mm <linux-mm@...ck.org>
Subject: [PATCH 4/4] hugetlb, rmap: add BUG_ON(!PageLocked) in hugetlb_add_anon_rmap()

Confirming page lock is held in hugetlb_add_anon_rmap() may be useful
to detect possible future problems.

Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
---
 mm/rmap.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git v2.6.36-rc3/mm/rmap.c v2.6.36-rc3/mm/rmap.c
index 2854857..9d2ba01 100644
--- v2.6.36-rc3/mm/rmap.c
+++ v2.6.36-rc3/mm/rmap.c
@@ -1582,6 +1582,8 @@ void hugepage_add_anon_rmap(struct page *page,
 {
 	struct anon_vma *anon_vma = vma->anon_vma;
 	int first;
+
+	BUG_ON(!PageLocked(page));
 	BUG_ON(!anon_vma);
 	BUG_ON(address < vma->vm_start || address >= vma->vm_end);
 	first = atomic_inc_and_test(&page->_mapcount);
-- 
1.7.2.2

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