linux-kernel - Re: [PATCH 2/6] cgroup: Allocate cgroup_file_ctx for kernfs_open

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Date:   Mon, 13 Dec 2021 11:29:36 -0800
From:   Linus Torvalds <torvalds@...uxfoundation.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Michal Koutny <mkoutny@...e.com>, Jens Axboe <axboe@...nel.dk>,
        Kees Cook <keescook@...omium.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jim Newsome <jnewsome@...project.org>,
        Alexey Gladkov <legion@...nel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jann Horn <jannh@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Security Officers <security@...nel.org>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH 2/6] cgroup: Allocate cgroup_file_ctx for kernfs_open_file->priv

On Mon, Dec 13, 2021 at 11:18 AM Tejun Heo <tj@...nel.org> wrote:
>
> v2: union dropped from cgroup_file_ctx and the procs iterator is embedded in
>     cgroup_file_ctx as suggested by Linus.

Thanks.

Looking at the patch, I mostly like the end result, although it
highlights how odd that __cgroup_procs_start() thing is.

I wonder if that 'started' flag could be removed, and the
css_task_iter_start() thing could be done at allocation time?

But I may just be confused. This is not a NAK, just a "that pattern
looks slightly odd to me".

               Linus