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

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Date:	Mon, 18 Feb 2008 15:39:58 +0900 (JST)
From:	yamamoto@...inux.co.jp (YAMAMOTO Takashi)
To:	lizf@...fujitsu.com
Cc:	akpm@...ux-foundation.org, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, balbir@...ux.vnet.ibm.com
Subject: Re: [PATCH 2/3] memcgroup: fix typo in VM_BUG_ON()

> 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>
> ---
>  mm/memcontrol.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 6bded84..c2959ee 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -534,7 +534,7 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
>  		if (scan >= nr_to_scan)
>  			break;
>  		page = pc->page;
> -		VM_BUG_ON(!pc);
> +		VM_BUG_ON(!page);

can't page be NULL here if mem_cgroup_uncharge clears pc->page behind us?
ie. bug.

YAMAMOTO Takashi
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