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Date: Thu, 8 Mar 2018 15:40:58 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Shakeel Butt <shakeelb@google.com>
Cc: Roman Gushchin <guro@fb.com>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        Michal Hocko <mhocko@kernel.org>, Greg Thelen <gthelen@google.com>,
        Johannes Weiner <hannes@cmpxchg.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, cgroups@vger.kernel.org
Subject: Re: [PATCH] mm: memcg: expose mem_cgroup_put API
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On Wed,  7 Mar 2018 18:48:50 -0800 Shakeel Butt <shakeelb@google.com> wrote:

> This patch exports mem_cgroup_put API to put the refcnt of the memory
> cgroup.

Not the best of changelogs :(

Why is this patch being added?

It's a prerequisite for <I-forget-which-patch> isn't it?