linux-kernel - Re: [PATCH] mm/memcg: add BUG() to mem_cgroup

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Date:	Fri, 6 Jul 2012 13:19:16 +0800
From:	Gavin Shan <shangw@...ux.vnet.ibm.com>
To:	Wanpeng Li <liwp.linux@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	cgroups@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/memcg: add BUG() to mem_cgroup_reset

On Fri, Jul 06, 2012 at 11:44:57AM +0800, Wanpeng Li wrote:
>From: Wanpeng Li <liwp@...ux.vnet.ibm.com>
>
>Branch in mem_cgroup_reset only can be RES_MAX_USAGE, RES_FAILCNT.
>
>Signed-off-by: Wanpeng Li <liwp.linux@...il.com>
>---
> mm/memcontrol.c |    2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
>diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>index a501660..5e4d1ab 100644
>--- a/mm/memcontrol.c
>+++ b/mm/memcontrol.c
>@@ -3976,6 +3976,8 @@ static int mem_cgroup_reset(struct cgroup *cont, unsigned int event)
> 		else
> 			res_counter_reset_failcnt(&memcg->memsw);
> 		break;
>+	default:
>+		BUG();

It might be not convinced to have "BUG()" here. You might add
something for debugging purpose. For example,
	default:
		printk(KERN_WARNING "%s: Unrecognized name %d\n",
			__func__, name);

Thanks,
Gavin
 
> 	}
>
> 	return 0;
>-- 
>1.7.5.4
>
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