linux-kernel - Re: [PATCH] memcg remove warning at DEBUG

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Date:	Thu, 16 Apr 2009 09:47:38 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrea Righi <righi.andrea@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	balbir@...ux.vnet.ibm.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH] memcg remove warning at DEBUG_VM=off

On Wed, 15 Apr 2009 12:13:17 +0200
Andrea Righi <righi.andrea@...il.com> wrote:

> The warning is still there actually. I've just written a fix and seen
> this discussion, maybe I can offload a little bit Kame. ;)
> 
> -Andrea

Thank you.
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

> ---
> memcg: remove warning when CONFIG_DEBUG_VM is not set
> 
> Fix the following warning removing mem_cgroup_is_obsolete():
> 
>   mm/memcontrol.c:318: warning: ‘mem_cgroup_is_obsolete’ defined but not used
> 
> Moreover, split the VM_BUG_ON() checks in two parts to be aware of which
> one triggered the bug.
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Andrea Righi <righi.andrea@...il.com>
> ---
>  mm/memcontrol.c |   11 ++---------
>  1 files changed, 2 insertions(+), 9 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index e44fb0f..8cd6358 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -314,14 +314,6 @@ static struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
>  	return mem;
>  }
>  
> -static bool mem_cgroup_is_obsolete(struct mem_cgroup *mem)
> -{
> -	if (!mem)
> -		return true;
> -	return css_is_removed(&mem->css);
> -}
> -
> -
>  /*
>   * Call callback function against all cgroup under hierarchy tree.
>   */
> @@ -932,7 +924,8 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
>  	if (unlikely(!mem))
>  		return 0;
>  
> -	VM_BUG_ON(!mem || mem_cgroup_is_obsolete(mem));
> +	VM_BUG_ON(!mem);
> +	VM_BUG_ON(css_is_removed(&mem->css));
>  
>  	while (1) {
>  		int ret;
> --
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