netdev - Re: [PATCH bpf-next v5 2/8] cgroup: enable cgroup_get_from

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Date:   Thu, 28 Jul 2022 06:51:38 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Yosry Ahmed <yosryahmed@...gle.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Hao Luo <haoluo@...gle.com>,
        Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shuah Khan <shuah@...nel.org>,
        Michal Hocko <mhocko@...nel.org>,
        KP Singh <kpsingh@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Michal Koutný <mkoutny@...e.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        David Rientjes <rientjes@...gle.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Greg Thelen <gthelen@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH bpf-next v5 2/8] cgroup: enable cgroup_get_from_file() on
 cgroup1

On Fri, Jul 22, 2022 at 05:48:23PM +0000, Yosry Ahmed wrote:
> cgroup_get_from_file() currently fails with -EBADF if called on cgroup
> v1. However, the current implementation works on cgroup v1 as well, so
> the restriction is unnecessary.
> 
> This enabled cgroup_get_from_fd() to work on cgroup v1, which would be
> the only thing stopping bpf cgroup_iter from supporting cgroup v1.
> 
> Signed-off-by: Yosry Ahmed <yosryahmed@...gle.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun