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Subject[PATCH] mm: replace list_move_tail() with add_page_to_lru_list_tail()
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This is a cleanup patch that replaces two historical uses of
list_move_tail() with relatively recent add_page_to_lru_list_tail().

Signed-off-by: Yu Zhao <yuzhao@google.com>
---
mm/swap.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/mm/swap.c b/mm/swap.c
index ae300397dfda..0226c5346560 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -515,7 +515,6 @@ static void lru_deactivate_file_fn(struct page *page, struct lruvec *lruvec,
del_page_from_lru_list(page, lruvec, lru + active);
ClearPageActive(page);
ClearPageReferenced(page);
- add_page_to_lru_list(page, lruvec, lru);

if (PageWriteback(page) || PageDirty(page)) {
/*
@@ -523,13 +522,14 @@ static void lru_deactivate_file_fn(struct page *page, struct lruvec *lruvec,
* It can make readahead confusing. But race window
* is _really_ small and it's non-critical problem.
*/
+ add_page_to_lru_list(page, lruvec, lru);
SetPageReclaim(page);
} else {
/*
* The page's writeback ends up during pagevec
* We moves tha page into tail of inactive.
*/
- list_move_tail(&page->lru, &lruvec->lists[lru]);
+ add_page_to_lru_list_tail(page, lruvec, lru);
__count_vm_event(PGROTATED);
}

@@ -844,17 +844,15 @@ void lru_add_page_tail(struct page *page, struct page *page_tail,
get_page(page_tail);
list_add_tail(&page_tail->lru, list);
} else {
- struct list_head *list_head;
/*
* Head page has not yet been counted, as an hpage,
* so we must account for each subpage individually.
*
- * Use the standard add function to put page_tail on the list,
- * but then correct its position so they all end up in order.
+ * Put page_tail on the list at the correct position
+ * so they all end up in order.
*/
- add_page_to_lru_list(page_tail, lruvec, page_lru(page_tail));
- list_head = page_tail->lru.prev;
- list_move_tail(&page_tail->lru, list_head);
+ add_page_to_lru_list_tail(page_tail, lruvec,
+ page_lru(page_tail));
}

if (!PageUnevictable(page))
--
2.22.0.510.g264f2c817a-goog
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