linux-kernel - Re: [PATCH 2/3] memcgroup: fix typo in VM_BUG

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Message-ID: <47B923C8.3090904@linux.vnet.ibm.com>
Date:	Mon, 18 Feb 2008 11:50:56 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	YAMAMOTO Takashi <yamamoto@...inux.co.jp>
CC:	lizf@...fujitsu.com, akpm@...ux-foundation.org,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] memcgroup: fix typo in VM_BUG_ON()

YAMAMOTO Takashi wrote:
>> Li Zefan wrote:
>>> No need for VM_BUG_ON(pc), since 'pc' is the list entry. This should
>>> be VM_BUG_ON(page).
>>>
>>> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
>>> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
>> pc is of type page_cgroup and we use list_for_each_entry_safe_reverse. Not sure
>> why we can't bug on pc.
> 
> pc is dereferenced before this VM_BUG_ON.
> 
> YAMAMOTO Takashi
> 

OK, so the VM_BUG_ON needs to move to an earlier location. Agreed.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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