From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Hugh Dickins <hughd@google.com>, Christoph Lameter <cl@linux.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Rik van Riel <riel@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Andi Kleen <andi@firstfloor.org>, linux-mm <linux-mm@kvack.org>
Subject: [PATCH 4/4] hugetlb, rmap: add BUG_ON(!PageLocked) in hugetlb_add_anon_rmap()
Date: Fri, 10 Sep 2010 13:23:06 +0900 [thread overview]
Message-ID: <1284092586-1179-5-git-send-email-n-horiguchi@ah.jp.nec.com> (raw)
In-Reply-To: <1284092586-1179-1-git-send-email-n-horiguchi@ah.jp.nec.com>
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@ah.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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next prev parent reply other threads:[~2010-09-10 4:25 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-10 4:23 [PATCH 0/4] hugetlb, rmap: fixes and cleanups Naoya Horiguchi
2010-09-10 4:23 ` [PATCH 1/4] hugetlb, rmap: always use anon_vma root pointer Naoya Horiguchi
2010-09-10 14:37 ` Andrea Arcangeli
2010-09-10 14:40 ` Rik van Riel
2010-09-10 17:19 ` Linus Torvalds
2010-09-10 21:50 ` Andi Kleen
2010-09-10 22:07 ` Linus Torvalds
2010-09-11 2:09 ` Rik van Riel
2010-09-10 4:23 ` [PATCH 2/4] hugetlb, rmap: use hugepage_add_new_anon_rmap() in hugetlb_cow() Naoya Horiguchi
2010-09-10 14:39 ` Andrea Arcangeli
2010-09-10 14:40 ` Rik van Riel
2010-09-10 4:23 ` [PATCH 3/4] hugetlb, rmap: fix confusing page locking " Naoya Horiguchi
2010-09-10 14:41 ` Rik van Riel
2010-09-10 17:15 ` Linus Torvalds
2010-09-23 23:50 ` Naoya Horiguchi
2010-09-10 4:23 ` Naoya Horiguchi [this message]
2010-09-10 14:42 ` [PATCH 4/4] hugetlb, rmap: add BUG_ON(!PageLocked) in hugetlb_add_anon_rmap() Rik van Riel
2010-09-10 14:44 ` Andrea Arcangeli
2010-09-10 9:04 ` [PATCH 0/4] hugetlb, rmap: fixes and cleanups Andi Kleen
2010-09-10 11:47 ` Naoya Horiguchi
2010-09-10 14:30 ` Andi Kleen
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