Re: [PATCH v2 bpf-next 3/5] bpf: Mark cgroup_subsys_state->cgroup RCU safe

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To: Song Liu <song@xxxxxxxxxx>
Subject: Re: [PATCH v2 bpf-next 3/5] bpf: Mark cgroup_subsys_state->cgroup RCU safe
From: Tejun Heo <tj@xxxxxxxxxx>
Date: Fri, 20 Jun 2025 16:45:08 -1000
Cc: bpf@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-security-module@xxxxxxxxxxxxxxx, kernel-team@xxxxxxxx, andrii@xxxxxxxxxx, eddyz87@xxxxxxxxx, ast@xxxxxxxxxx, daniel@xxxxxxxxxxxxx, martin.lau@xxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx, brauner@xxxxxxxxxx, jack@xxxxxxx, kpsingh@xxxxxxxxxx, mattbobrowski@xxxxxxxxxx, amir73il@xxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, daan.j.demeyer@xxxxxxxxx
In-reply-to: <20250619220114.3956120-4-song@kernel.org>

On Thu, Jun 19, 2025 at 03:01:12PM -0700, Song Liu wrote:
> Mark struct cgroup_subsys_state->cgroup as safe under RCU read lock. This
> will enable accessing css->cgroup from a bpf css iterator.
> 
> Signed-off-by: Song Liu <song@xxxxxxxxxx>

Acked-by: Tejun Heo <tj@xxxxxxxxxx>

Thanks.

-- 
tejun

References:
- [PATCH v2 bpf-next 0/5] Introduce bpf_cgroup_read_xattr
  - From: Song Liu
- [PATCH v2 bpf-next 3/5] bpf: Mark cgroup_subsys_state->cgroup RCU safe
  - From: Song Liu

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