From: Naoya Horiguchi Date: Fri, 10 Sep 2010 04:23:06 +0000 (+0900) Subject: hugetlb, rmap: add BUG_ON(!PageLocked) in hugetlb_add_anon_rmap() X-Git-Tag: Ubuntu-5.0.0-8.9~21530 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=a850ea30374ebed32a0724742601861853fde869;p=mirror_ubuntu-disco-kernel.git 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 Acked-by: Rik van Riel Acked-by: Andrea Arcangeli Signed-off-by: Linus Torvalds --- diff --git a/mm/rmap.c b/mm/rmap.c index 2854857fd63b..9d2ba01bd4f9 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);