linux-kernel - Re: [PATCH] mm: memcontrol.c: move mem_cgroup_id_get_many under CONFIG

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Date:   Tue, 17 Dec 2019 10:17:10 -0500
From:   Qian Cai <cai@....pw>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Chris Down <chris@...isdown.name>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: memcontrol.c: move mem_cgroup_id_get_many under CONFIG_MMU



> On Dec 17, 2019, at 10:13 AM, Michal Hocko <mhocko@...nel.org> wrote:
> 
> I do understand the general purpose of the warning. I am simply not sure
> the kernel tree is a good candidate with a huge number of different
> config combinations that might easily result in warnings which would
> tend to result in even more ifdeferry than we have.

Yes, compiling test without real-world use case is evil. Once we ignore the evil, it becomes much more manageable.