netdev - bpf, cgroups: Fix cgroup v2 fallback on v1/v2 mixed mode [backport]

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Date:   Fri, 29 Oct 2021 14:50:50 -0700
From:   Ivan Babrou <ivan@...udflare.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     kernel-team <kernel-team@...udflare.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Stanislav Fomichev <sdf@...gle.com>, Tejun Heo <tj@...nel.org>
Subject: bpf, cgroups: Fix cgroup v2 fallback on v1/v2 mixed mode [backport]

Hello,

We have re-discovered the issue fixed by the following commit in v5.15:

* https://github.com/torvalds/linux/commit/8520e224f54

Is it possible to also backport the fix to 5.10 series, where the
issue is also present?

Thanks!