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@163.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 4b809cc..987d4b5 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2014,8 +2014,7 @@ static int gather_surplus_pages(struct hstate *h, int delta)
* 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: