linux-kernel - Re: [PATCH] mm: memcontrol: avoid unused function warning

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Date:   Wed, 24 Aug 2016 12:18:39 +0300
From:   Vladimir Davydov <vdavydov@...tuozzo.com>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Tejun Heo <tj@...nel.org>,
        "Mel Gorman" <mgorman@...hsingularity.net>,
        <cgroups@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: memcontrol: avoid unused function warning

On Wed, Aug 24, 2016 at 10:22:43AM +0200, Arnd Bergmann wrote:
> A bugfix in v4.8-rc2 introduced a harmless warning when CONFIG_MEMCG_SWAP
> is disabled but CONFIG_MEMCG is enabled:
> 
> mm/memcontrol.c:4085:27: error: 'mem_cgroup_id_get_online' defined but not used [-Werror=unused-function]
>  static struct mem_cgroup *mem_cgroup_id_get_online(struct mem_cgroup *memcg)
> 
> This adds an extra #ifdef that matches the one around the caller to
> avoid the warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 1f47b61fb407 ("mm: memcontrol: fix swap counter leak on swapout from offline cgroup")

Acked-by: Vladimir Davydov <vdavydov@...tuozzo.com>