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From:   Shakeel Butt <shakeelb@google.com>
Date:   Tue, 16 Mar 2021 09:25:18 -0700
Message-ID: <CALvZod7tDf3vvspJmS551GkiNbSdCH9VWNgWMesmUi2Q3NkgKA@mail.gmail.com>
Subject: Re: [PATCH 3/3] loop: Charge i/o to mem and blk cg
To:     Dan Schatzberg <schatzberg.dan@gmail.com>
Cc:     Jens Axboe <axboe@kernel.dk>, Tejun Heo <tj@kernel.org>,
        Zefan Li <lizefan.x@bytedance.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Michal Hocko <mhocko@kernel.org>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        Hugh Dickins <hughd@google.com>, Roman Gushchin <guro@fb.com>,
        Muchun Song <songmuchun@bytedance.com>,
        Alex Shi <alex.shi@linux.alibaba.com>,
        Alexander Duyck <alexander.h.duyck@linux.intel.com>,
        Chris Down <chris@chrisdown.name>,
        Yafang Shao <laoar.shao@gmail.com>,
        Wei Yang <richard.weiyang@gmail.com>,
        "open list:BLOCK LAYER" <linux-block@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        "open list:CONTROL GROUP (CGROUP)" <cgroups@vger.kernel.org>,
        "open list:MEMORY MANAGEMENT" <linux-mm@kvack.org>
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On Tue, Mar 16, 2021 at 8:37 AM Dan Schatzberg <schatzberg.dan@gmail.com> wrote:
>
[...]
>
>  /* Support for loadable transfer modules */
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 0c04d39a7967..fd5dd961d01f 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -1187,6 +1187,17 @@ static inline struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm)
>         return NULL;
>  }
>
> +static inline struct mem_cgroup *get_mem_cgroup_from_page(struct page *page)
> +{
> +       return NULL;
> +}

The above function has been removed.