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

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Date:   Wed, 16 Nov 2022 21:10:48 +0530
From:   Kamalesh Babulal <kamalesh.babulal@...cle.com>
To:     Waiman Long <longman@...hat.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 20:06, Waiman Long wrote:
> 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.

Thank you for reviewing the patch. Does the following, rephrase, sound right:

Allocate and initialize a new cpuset css, for non-NULL @parent_css, return                             
top cpuset css otherwise.

>>    */
>>     static struct cgroup_subsys_state *
> 
> While at it, could you also remove the blank line between the comment and the function body.

Sure, will remove it.

-- 
Thanks,
Kamalesh