linux-kernel - Re: [PATCH] memcg: remove unused mem_cgroup_from

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Message-ID: <20230529185337.3gk3ww76sdxdgv6o@google.com>
Date:   Mon, 29 May 2023 18:53:37 +0000
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Muchun Song <muchun.song@...ux.dev>,
        Yosry Ahmed <yosryahmed@...gle.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Vasily Averin <vasily.averin@...ux.dev>, hannes@...xchg.org,
        mhocko@...nel.org, roman.gushchin@...ux.dev,
        akpm@...ux-foundation.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] memcg: remove unused mem_cgroup_from_obj()

On Sun, May 28, 2023 at 08:36:43PM +0100, Matthew Wilcox wrote:
> On Sun, May 28, 2023 at 09:01:37PM +0800, Muchun Song wrote:
> > with *init_net*. If Vasily does not want to bring commit 1d0403d20f6c back,
> > this patch LGTM. Otherwise, let's wait for Vasily.
> 
> If we're not going to bring back 1d0403d20f6c then we should
> simply revert fc4db90fe71e instead of applying this patch.

Initially I was thinking of adding virt_addr_valid() check in the
mem_cgroup_from_obj() but it seems like that check is not cheap on
arm64. I don't have any quick solutions other than adding a check
against init_net in __register_pernet_operations(). I will wait for
couple of days for Vasily otherwise I will retry 1d0403d20f6c with the
init_net check in __register_pernet_operations().