linux-kernel - [Patch v2] mm/page_reporting: drop stale list head check in page_reporting

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Message-Id: <20200818084448.33969-1-richard.weiyang@linux.alibaba.com>
Date:   Tue, 18 Aug 2020 16:44:48 +0800
From:   Wei Yang <richard.weiyang@...ux.alibaba.com>
To:     alexander.h.duyck@...ux.intel.com, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, david@...hat.com,
        Wei Yang <richard.weiyang@...ux.alibaba.com>
Subject: [Patch v2] mm/page_reporting: drop stale list head check in page_reporting_cycle

list_for_each_entry_safe() guarantees that we will never stumble over
the list head; "&page->lru != list" will always evaluate to true. Let's
simplify.

Signed-off-by: Wei Yang <richard.weiyang@...ux.alibaba.com>
Reviewed-by: David Hildenbrand <david@...hat.com>
---
 mm/page_reporting.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_reporting.c b/mm/page_reporting.c
index 3bbd471cfc81..aaaa3605123d 100644
--- a/mm/page_reporting.c
+++ b/mm/page_reporting.c
@@ -178,7 +178,7 @@ page_reporting_cycle(struct page_reporting_dev_info *prdev, struct zone *zone,
 		 * the new head of the free list before we release the
 		 * zone lock.
 		 */
-		if (&page->lru != list && !list_is_first(&page->lru, list))
+		if (!list_is_first(&page->lru, list))
 			list_rotate_to_front(&page->lru, list);
 
 		/* release lock before waiting on report processing */
-- 
2.20.1 (Apple Git-117)