linux-kernel - [PATCH 3/3] mm: fix return value in __alloc_contig_migrate

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Date:	Tue, 17 Jul 2012 01:14:32 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Joonsoo Kim <js1304@...il.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Minchan Kim <minchan@...nel.org>,
	Christoph Lameter <cl@...ux.com>
Subject: [PATCH 3/3] mm: fix return value in __alloc_contig_migrate_range()

migrate_pages() would return positive value in some failure case,
so 'ret > 0 ? 0 : ret' may be wrong.
This fix it and remove one dead statement.

Signed-off-by: Joonsoo Kim <js1304@...il.com>
Cc: Michal Nazarewicz <mina86@...a86.com>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Christoph Lameter <cl@...ux.com>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 4403009..02d4519 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5673,7 +5673,6 @@ static int __alloc_contig_migrate_range(unsigned long start, unsigned long end)
 			}
 			tries = 0;
 		} else if (++tries == 5) {
-			ret = ret < 0 ? ret : -EBUSY;
 			break;
 		}
 
@@ -5683,7 +5682,7 @@ static int __alloc_contig_migrate_range(unsigned long start, unsigned long end)
 	}
 
 	putback_lru_pages(&cc.migratepages);
-	return ret > 0 ? 0 : ret;
+	return ret <= 0 ? ret : -EBUSY;
 }
 
 /*
-- 
1.7.9.5

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