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 <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Acked-by: Andrea Arcangeli <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
diff --git a/mm/rmap.c b/mm/rmap.c
index 2854857..9d2ba01 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1582,6 +1582,8 @@
{
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);
