linux-kernel - [PATCH v3 9/9] mm/page_isolation: clean up confused code

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Date:	Fri, 17 Jun 2016 16:57:39 +0900
From:	js1304@...il.com
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Vlastimil Babka <vbabka@...e.cz>, mgorman@...hsingularity.net,
	Minchan Kim <minchan@...nel.org>,
	Alexander Potapenko <glider@...gle.com>,
	Hugh Dickins <hughd@...gle.com>,
	Michal Hocko <mhocko@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Sasha Levin <sasha.levin@...cle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH v3 9/9] mm/page_isolation: clean up confused code

From: Joonsoo Kim <iamjoonsoo.kim@....com>

When there is an isolated_page, post_alloc_hook() is called with
page but __free_pages() is called with isolated_page. Since they are
the same so no problem but it's very confusing. To reduce it,
this patch changes isolated_page to boolean type and uses page variable
consistently.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/page_isolation.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index 4639163..064b7fb 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -81,7 +81,7 @@ static void unset_migratetype_isolate(struct page *page, unsigned migratetype)
 {
 	struct zone *zone;
 	unsigned long flags, nr_pages;
-	struct page *isolated_page = NULL;
+	bool isolated_page = false;
 	unsigned int order;
 	unsigned long page_idx, buddy_idx;
 	struct page *buddy;
@@ -109,7 +109,7 @@ static void unset_migratetype_isolate(struct page *page, unsigned migratetype)
 			if (pfn_valid_within(page_to_pfn(buddy)) &&
 			    !is_migrate_isolate_page(buddy)) {
 				__isolate_free_page(page, order);
-				isolated_page = page;
+				isolated_page = true;
 			}
 		}
 	}
@@ -129,7 +129,7 @@ out:
 	spin_unlock_irqrestore(&zone->lock, flags);
 	if (isolated_page) {
 		post_alloc_hook(page, order, __GFP_MOVABLE);
-		__free_pages(isolated_page, order);
+		__free_pages(page, order);
 	}
 }
 
-- 
1.9.1