[RFC 04/11] mm: remove SWAP_MLOCK check for SWAP_SUCCESS in ttu

Minchan Kim
2017-03-02T06:39:31Z

If the page is mapped and rescue in ttuo, page_mapcount(page) == 0 cannot
be true so page_mapcount check in ttu is enough to return SWAP_SUCCESS.
IOW, SWAP_MLOCK check is redundant so remove it.

Signed-off-by: Minchan Kim <minchan@kernel.org>
---
mm/rmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index 3a14013..0a48958 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1523,7 +1523,7 @@ int try_to_unmap(struct page *page, enum ttu_flags flags)
else
ret = rmap_walk(page, &rwc);

- if (ret != SWAP_MLOCK && !page_mapcount(page))
+ if (!page_mapcount(page))
ret = SWAP_SUCCESS;
return ret;
}
--
2.7.4