linux-kernel - Re: [PATCH] Handling of unused variable 'do-numainfo on compilation time

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Date:	Fri, 3 Feb 2012 14:39:50 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Geunsik Lim <geunsik.lim@...il.com>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] Handling of unused variable 'do-numainfo on compilation
 time

Michal, this keeps coming up, please decide between the proposed
solutions ;-)

On Fri, Feb 03, 2012 at 05:43:47PM +0900, Geunsik Lim wrote:
> Actually, Usage of the variable 'do_numainfo'is not suitable for gcc compiler.
> Declare the variable 'do_numainfo' if the number of NUMA nodes > 1.
> 
> Signed-off-by: Geunsik Lim <geunsik.lim@...sung.com>
> ---
>  mm/memcontrol.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 556859f..4e17ac5 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -776,7 +776,10 @@ 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;
> +#if MAX_NUMNODES > 1
> +                bool do_numainfo;
> +#endif
>  
>  		do_softlimit = mem_cgroup_event_ratelimit(memcg,
>  						MEM_CGROUP_TARGET_SOFTLIMIT);
> -- 
> 1.7.8.1
> 
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