linux-kernel - Re: [PATCH] memcg: fix compile warning on non-numa systems

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Date:	Thu, 26 Jan 2012 00:55:21 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Li Zefan <lizf@...fujitsu.com>, linux-mm@...ck.org,
	"bsingharora@...il.com" <bsingharora@...il.com>,
	Hiroyuki KAMEZAWA <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Cgroups <cgroups@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>
Subject: Re: [PATCH] memcg: fix compile warning on non-numa systems

On Mon, 16 Jan 2012 09:47:15 +0100 Michal Hocko <mhocko@...e.cz> wrote:

> On Mon 16-01-12 14:04:53, Li Zefan wrote:
> > Fix this warning:
> > 
> >   CC      mm/memcontrol.o
> > mm/memcontrol.c: In function 'memcg_check_events':
> > mm/memcontrol.c:779:22: warning: unused variable 'do_numainfo'
> 
> This has been already posted by Kirill and I didn't like the solution
> (https://lkml.org/lkml/2011/12/27/86). He then reposted with a different
> version (https://lkml.org/lkml/2012/1/6/281).
> The later one looks better but I still think this is not worth
> complicate the code just to get rid of this warning.

This?

--- a/mm/memcontrol.c~a
+++ a/mm/memcontrol.c
@@ -776,7 +776,8 @@ static void memcg_check_events(struct me
 	/* 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;
+		bool do_numainfo __maybe_unused;
 
 		do_softlimit = mem_cgroup_event_ratelimit(memcg,
 						MEM_CGROUP_TARGET_SOFTLIMIT);
_

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