linux-kernel - [PATCH 1/4] mm/migrate: correct return value of migrate

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Message-Id: <1386319310-28016-1-git-send-email-iamjoonsoo.kim@lge.com>
Date:	Fri,  6 Dec 2013 17:41:47 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Rafael Aquini <aquini@...hat.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Christoph Lameter <cl@...ux.com>,
	Joonsoo Kim <js1304@...il.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH 1/4] mm/migrate: correct return value of migrate_pages()

migrate_pages() should return number of pages not migrated or error code.
When unmap_and_move return -EAGAIN, outer loop is re-execution without
initialising nr_failed. This makes nr_failed over-counted.

So this patch correct it by initialising nr_failed in outer loop.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

diff --git a/mm/migrate.c b/mm/migrate.c
index 3747fcd..1f59ccc 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1102,6 +1102,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
 
 	for(pass = 0; pass < 10 && retry; pass++) {
 		retry = 0;
+		nr_failed = 0;
 
 		list_for_each_entry_safe(page, page2, from, lru) {
 			cond_resched();
-- 
1.7.9.5

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