linux-kernel - [PATCH] mm/compaction: remove local variable is

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Date:	Fri, 17 Jun 2016 17:32:51 +0800
From:	Ganesh Mahendran <opensource.ganesh@...il.com>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, vbabka@...e.cz, iamjoonsoo.kim@....com,
	mhocko@...e.com, hillf.zj@...baba-inc.com, minchan@...nel.org,
	Ganesh Mahendran <opensource.ganesh@...il.com>
Subject: [PATCH] mm/compaction: remove local variable is_lru

local varialbe is_lru was used for tracking non-lru pages(such as
balloon pages).

But commit
112ea7b668d3 ("mm: migrate: support non-lru movable page migration")
introduced a common framework for non-lru page migration and moved
the compound pages check before non-lru movable pages check.

So there is no need to use local variable is_lru.

Signed-off-by: Ganesh Mahendran <opensource.ganesh@...il.com>
---
 mm/compaction.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index fbb7b38..780be7f 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -724,7 +724,6 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 
 	/* Time to isolate some pages for migration */
 	for (; low_pfn < end_pfn; low_pfn++) {
-		bool is_lru;
 
 		if (skip_on_failure && low_pfn >= next_skip_pfn) {
 			/*
@@ -807,8 +806,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 		 * It's possible to migrate LRU and non-lru movable pages.
 		 * Skip any other type of page
 		 */
-		is_lru = PageLRU(page);
-		if (!is_lru) {
+		if (!PageLRU(page)) {
 			/*
 			 * __PageMovable can return false positive so we need
 			 * to verify it under page_lock.
-- 
1.9.1