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Subject[PATCH v1 03/10] mm: remove SWAP_MLOCK check for SWAP_SUCCESS in ttu
Date
If the page is mapped and rescue in try_to_unmap_one,
page_mapcount(page) == 0 cannot be true so page_mapcount check
in try_to_unmap 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 d47af09..1cfb3a3 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1530,7 +1530,7 @@ 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
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