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

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Message-Id: <20110112093814.7ddc9fe7.nishimura@mxp.nes.nec.co.jp>
Date:	Wed, 12 Jan 2011 09:38:14 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH 1/2] memcg: remove unnecessary BUG_ON

On Tue, 11 Jan 2011 17:51:11 +0900
Minchan Kim <minchan.kim@...il.com> wrote:

> Now memcg in unmap_and_move checks BUG_ON of charge.
> 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: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
> Cc: Balbir Singh <balbir@...ux.vnet.ibm.com>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>

Acked-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>
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