linux-kernel - Re: [PATCH] mm: Make mem_cgroup_id_get_many dependent on MMU and MEMCG

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Message-ID: <20200305141845.GZ16139@dhcp22.suse.cz>
Date:   Thu, 5 Mar 2020 15:18:45 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Vincenzo Frascino <vincenzo.frascino@....com>
Cc:     cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: Make mem_cgroup_id_get_many dependent on MMU and
 MEMCG_SWAP

On Thu 05-03-20 10:46:21, Vincenzo Frascino wrote:
[...]
> I am aware of this. I was just exploring if there was a possibility of
> addressing the warning, since if we leave all the warnings in scenarios like
> randconfig can cause confusion in between real and non real issues.

I would very much like to address _real_ warnings. This one is just
bugus. I do not see a fix that would be sensible. Wrapping the helper
by ifdefs is just going to make the resulting code worse because there
is nothing really specific to swap there. Marking it __maybe_unused will
just paper over the report and allow the function to bitrot when it is
not used anymore.

So for now I would just live with the warning unless it is really
causing any real problems.

-- 
Michal Hocko
SUSE Labs