[PATCH -mm 2/7] mm: thp: change __get_page_tail() to use __put_nontail_page()

[Oleg Nesterov <oleg@redhat.com>]

__get_page_tail() can use __put_nontail_page() instead of put_page()
if it races with split_huge_page(). This is what put_compound_page()
does, so this is equally safe. And this allows us to factor out this
code later.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
 mm/swap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/swap.c b/mm/swap.c
index f83de1f..aae24fe 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -289,7 +289,7 @@ bool __get_page_tail(struct page *page)
 		}
 		compound_unlock_irqrestore(page_head, flags);
 		if (unlikely(!got))
-			put_page(page_head);
+			__put_nontail_page(page_head);
 	}
 	return got;
 }
-- 
1.5.5.1