linux-kernel - Re: [PATCH v2] mm: Make mem_cgroup_id_get_many() __maybe

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Message-ID: <20200305172248.GB2508@cmpxchg.org>
Date:   Thu, 5 Mar 2020 12:22:48 -0500
From:   Johannes Weiner <hannes@...xchg.org>
To:     Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2] mm: Make mem_cgroup_id_get_many() __maybe_unused

On Thu, Mar 05, 2020 at 04:43:54PM +0000, Vincenzo Frascino wrote:
> mem_cgroup_id_get_many() is currently used only when MMU or MEMCG_SWAP
> configuration options are enabled. Having them disabled triggers the
> following warning at compile time:
> 
> linux/mm/memcontrol.c:4797:13: warning: ‘mem_cgroup_id_get_many’ defined
> but not used [-Wunused-function]
>  static void mem_cgroup_id_get_many(struct mem_cgroup *memcg, unsigned
>  int n)
> 
> Make mem_cgroup_id_get_many() __maybe_unused to address the issue.
> 
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Vladimir Davydov <vdavydov.dev@...il.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@....com>

Acked-by: Johannes Weiner <hannes@...xchg.org>

Thanks Vincenzo.