linux-kernel - Re: [PATCH 2/3] memcgroup: fix typo in VM_BUG_ON()

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Message-Id: <20080218062209.DA59B1E3C58@siro.lan>
Date:	Mon, 18 Feb 2008 15:22:09 +0900 (JST)
From:	yamamoto@...inux.co.jp (YAMAMOTO Takashi)
To:	balbir@...ux.vnet.ibm.com
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()

> 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

> 
> 
> 
> -- 
> 	Warm Regards,
> 	Balbir Singh
> 	Linux Technology Center
> 	IBM, ISTL
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> Containers@...ts.linux-foundation.org
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