linux-kernel - [PATCH v2 1/2] memcg: remove unnecessary BUG

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Message-Id: <b691a7be970d6aafcd12ccc32ba812ce39fcf027.1298214672.git.minchan.kim@gmail.com>
Date:	Mon, 21 Feb 2011 00:17:17 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Minchan Kim <minchan.kim@...il.com>
Subject: [PATCH v2 1/2] memcg: remove unnecessary BUG_ON

Now memcg in unmap_and_move checks BUG_ON of charge.
But mem_cgroup_prepare_migration returns either 0 or -ENOMEM.
If it returns -ENOMEM, it jumps out unlock without the check.
If it returns 0, it can pass BUG_ON. So it's meaningless.
Let's remove it.

Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Balbir Singh <balbir@...ux.vnet.ibm.com>
Acked-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Signed-off-by: Minchan Kim <minchan.kim@...il.com>
---
 mm/migrate.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index eb083a6..2abc9c9 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -683,7 +683,6 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
 		rc = -ENOMEM;
 		goto unlock;
 	}
-	BUG_ON(charge);
 
 	if (PageWriteback(page)) {
 		if (!force || !sync)
-- 
1.7.1

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