[PATCH] mm/vmscan: remove checking on PG_lru

[Gavin Shan <shangw@linux.vnet.ibm.com>]

Function __isolate_lru_page() is called by isolate_lru_pages() or
isolate_migratepages_range(). For both cases, the PG_lru flag for
the target page frame has been checked. So we needn't check that
again in function __isolate_lru_page() and just remove the check
in function __isolate_lru_page().

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
---
 mm/vmscan.c |    4 ----
 1 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6615763..77d5704 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -940,10 +940,6 @@ int __isolate_lru_page(struct page *page, isolate_mode_t mode)
 {
 	int ret = -EINVAL;
 
-	/* Only take pages on the LRU. */
-	if (!PageLRU(page))
-		return ret;
-
 	/* Do not give back unevictable pages for compaction */
 	if (PageUnevictable(page))
 		return ret;
-- 
1.7.5.4

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