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hugetlb, rmap: add BUG_ON(!PageLocked) in hugetlb_add_anon_rmap()

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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>
This commit is contained in:
Naoya Horiguchi 2010-09-10 13:23:06 +09:00 committed by Linus Torvalds
parent 56c9cfb13c
commit a850ea3037
1 changed files with 2 additions and 0 deletions
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2
mm/rmap.c
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@ -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);