linux-kernel - Re: [PATCH] cgroup/cpuset: Improve cpuset_css

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Message-ID: <7eb8d6f9-b54c-aedc-982b-8ed2bddb948b@redhat.com>
Date:   Wed, 16 Nov 2022 09:36:19 -0500
From:   Waiman Long <longman@...hat.com>
To:     Kamalesh Babulal <kamalesh.babulal@...cle.com>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Hromatka <tom.hromatka@...cle.com>
Subject: Re: [PATCH] cgroup/cpuset: Improve cpuset_css_alloc() description

On 11/16/22 00:44, Kamalesh Babulal wrote:
> Change the function argument in the description of cpuset_css_alloc()
> from 'struct cgroup' -> 'struct cgroup_subsys_state'.  The change to the
> argument type was introduced by commit eb95419b023a ("cgroup: pass
> around cgroup_subsys_state instead of cgroup in subsystem methods").
> Also, add more information to its description.
>
> Signed-off-by: Kamalesh Babulal <kamalesh.babulal@...cle.com>
> ---
>   kernel/cgroup/cpuset.c | 11 ++++++++---
>   1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
> index b474289c15b8..aac790462e74 100644
> --- a/kernel/cgroup/cpuset.c
> +++ b/kernel/cgroup/cpuset.c
> @@ -3046,9 +3046,14 @@ static struct cftype dfl_files[] = {
>   };
>   
>   
> -/*
> - *	cpuset_css_alloc - allocate a cpuset css
> - *	cgrp:	control group that the new cpuset will be part of
> +/**
> + * cpuset_css_alloc - Allocate a cpuset css
> + * @parent_css: Parent css of the control group that the new cpuset will be
> + *              part of
> + * Return: cpuset css on success, -ENOMEM on failure.
> + *
> + * Allocate and initialize a new cpuset css, for non-root cpuset or return the
> + * top cpuset css for root cpuset.
Strictly speaking, it returns the css of top cpuset set for NULL input 
parameter.
>    */
>   
>   static struct cgroup_subsys_state *

While at it, could you also remove the blank line between the comment 
and the function body.

Thanks,
Longman