linux-kernel - Re: [PATCH] memcgroup: remove a useless VM_BUG

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Message-Id: <20080218174855.de9182c3.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Mon, 18 Feb 2008 17:48:55 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	akpm@...ux-foundation.org, balbir@...ux.vnet.ibm.com,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memcgroup: remove a useless VM_BUG_ON()

On Mon, 18 Feb 2008 15:34:48 +0800
Li Zefan <lizf@...fujitsu.com> wrote:

> Remove this VM_BUG_ON(), as Balbir stated:
> 
> We used to have a for loop with !list_empty() as a termination condition
> and VM_BUG_ON(!pc) is a spill over. With the new loop, VM_BUG_ON(!pc) does not
> make sense.
> 
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>
> ---
>  mm/memcontrol.c |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 718acf8..631002d 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -534,7 +534,6 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
>  		if (scan >= nr_to_scan)
>  			break;
>  		page = pc->page;
> -		VM_BUG_ON(!pc);
>  
>  		if (unlikely(!PageLRU(page)))
>  			continue;
> -- 
> 1.5.4.rc3
> 
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Thanks,
-Kame

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