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

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Message-ID: <20120706053731.GD5929@kernel>
Date:	Fri, 6 Jul 2012 13:37:31 +0800
From:	Wanpeng Li <liwp.linux@...il.com>
To:	Gavin Shan <shangw@...ux.vnet.ibm.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 01:19:16PM +0800, Gavin Shan wrote:
>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);

But many funtions in mm/memcontrol.c use BUG(), if the branch is not
present. 

Regards,
Wanpeng Li

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