linux-kernel - Re: [PATCH] cgroup: Simplify code in css_set_move

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Date:   Thu, 27 Oct 2022 10:05:58 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     "haifeng.xu" <haifeng.xu@...pee.com>
Cc:     tj@...nel.org, lizefan.x@...edance.com, hannes@...xchg.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cgroup: Simplify code in css_set_move_task

Hello.

On Thu, Oct 20, 2022 at 07:47:01AM +0000, "haifeng.xu" <haifeng.xu@...pee.com> wrote:
> -	lockdep_assert_held(&css_set_lock);
> +	if (!cset || css_set_populated(cset))
> +		return;

1) the guard should be css_set_populated() ^ populated (when unsetting
the populated trait)

2) I'd keep the lockdep_assert_held() after it anyway.

Also the commit message should explain what's the reason to move
css_set_populated() after css_set_move_task().


Thanks,
Michal

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