linux-kernel - Re: [PATCH 1/6] memcg: fix unused variable warning

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Date:	Mon, 26 Dec 2011 15:25:31 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	linux-mm@...ck.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	Balbir Singh <bsingharora@...il.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH 1/6] memcg: fix unused variable warning

On Sat, 24 Dec 2011 05:00:14 +0200
"Kirill A. Shutemov" <kirill@...temov.name> wrote:

> From: "Kirill A. Shutemov" <kirill@...temov.name>
> 
> mm/memcontrol.c: In function ‘memcg_check_events’:
> mm/memcontrol.c:784:22: warning: unused variable ‘do_numainfo’ [-Wunused-variable]
> 
> Signed-off-by: Kirill A. Shutemov <kirill@...temov.name>

Hmm ? Doesn't this fix cause a new Warning ?

mm/memcontrol.c: In function ?memcg_check_events?:
mm/memcontrol.c:789: warning: ISO C90 forbids mixed declarations and code

Thanks,
-Kame
> ---
>  mm/memcontrol.c |    7 ++++---
>  1 files changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index d643bd6..a5e92bd 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -781,14 +781,15 @@ static void memcg_check_events(struct mem_cgroup *memcg, struct page *page)
>  	/* threshold event is triggered in finer grain than soft limit */
>  	if (unlikely(mem_cgroup_event_ratelimit(memcg,
>  						MEM_CGROUP_TARGET_THRESH))) {
> -		bool do_softlimit, do_numainfo;
> +		bool do_softlimit;
>  
> -		do_softlimit = mem_cgroup_event_ratelimit(memcg,
> -						MEM_CGROUP_TARGET_SOFTLIMIT);
>  #if MAX_NUMNODES > 1
> +		bool do_numainfo;
>  		do_numainfo = mem_cgroup_event_ratelimit(memcg,
>  						MEM_CGROUP_TARGET_NUMAINFO);
>  #endif
> +		do_softlimit = mem_cgroup_event_ratelimit(memcg,
> +						MEM_CGROUP_TARGET_SOFTLIMIT);
>  		preempt_enable();
>  
>  		mem_cgroup_threshold(memcg);
> -- 
> 1.7.7.3
> 

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