From: Hui Su <sh_def@xxxxxxx> Subject: mm/hugetlb.c: just use put_page_testzero() instead of page_count() We test the page reference count is zero or not here, it can be a bug here if page refercence count is not zero. So we can just use put_page_testzero() instead of page_count(). Link: https://lkml.kernel.org/r/20201007170949.GA6416@rlk Signed-off-by: Hui Su <sh_def@xxxxxxx> Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/hugetlb.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/mm/hugetlb.c~mm-hugetlbc-just-use-put_page_testzero-instead-of-page_count +++ a/mm/hugetlb.c @@ -2014,8 +2014,7 @@ retry: * This page is now managed by the hugetlb allocator and has * no users -- drop the buddy allocator's reference. */ - put_page_testzero(page); - VM_BUG_ON_PAGE(page_count(page), page); + VM_BUG_ON_PAGE(!put_page_testzero(page), page); enqueue_huge_page(h, page); } free: _
