linux-kernel - Re: [PATCH] mm/memcontrol.c: fix another unused function warning

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Date:   Tue, 01 Oct 2019 12:44:32 -0400
From:   Qian Cai <cai@....pw>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Chris Down <chris@...isdown.name>, Tejun Heo <tj@...nel.org>,
        cgroups@...r.kernel.org, Linux-MM <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] mm/memcontrol.c: fix another unused function warning

On Tue, 2019-10-01 at 18:00 +0200, Arnd Bergmann wrote:
> On Tue, Oct 1, 2019 at 4:40 PM Qian Cai <cai@....pw> wrote:
> > 
> > On Tue, 2019-10-01 at 16:22 +0200, Arnd Bergmann wrote:
> > > Removing the mem_cgroup_id_get() stub function introduced a new warning
> > > of the same kind when CONFIG_MMU is disabled:
> > 
> > Shouldn't CONFIG_MEMCG depends on CONFIG_MMU instead?
> 
> Maybe. Generally we allow building a lot of stuff without CONFIG_MMU that
> may not make sense, so I just followed the same idea here.

Those blindly mark __maybe_unused might just mask important warnings off in the
future, and they are ugly. Let's fix it properly.