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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2010-09-10 13:23:06 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2010-09-23 17:29:19 -0700
commita850ea30374ebed32a0724742601861853fde869 (patch)
tree436dda49aae61ac7c228a7fadb53fd0632666827 /mm
parent56c9cfb13c9b6516017eea4e8cbe22ea02e07ee6 (diff)
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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@ah.jp.nec.com> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/rmap.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index 2854857fd63..9d2ba01bd4f 100644
--- a/mm/rmap.c
+++ b/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);