Re: [RESEND] [PATCH] memcg: Fix build warning and avoid checking for mem != null again and again

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Thu, 28 May 2009 14:20:43 +0530
Nikanth Karthikesan <knikanth@suse.de> wrote:

> 
> Resending the patch to Andrew for inclusion in -mm tree.
> 
> Thanks
> Nikanth
> 
> Fix build warning, "mem_cgroup_is_obsolete defined but not used" when
> CONFIG_DEBUG_VM is not set. Also avoid checking for !mem again and again.
> 
> Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
> 
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>


> ---
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 01c2d8f..d253846 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 +924,7 @@ 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(css_is_removed(&mem->css));
>  
>  	while (1) {
>  		int ret;
> 
> 
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