linux-kernel - Re: [PATCH v4] sched/rt: move back to RT_GROUP

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Date:   Tue, 3 Oct 2023 11:51:47 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Yajun Deng <yajun.deng@...ux.dev>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com,
        linux-kernel@...r.kernel.org,
        kernel test robot <oliver.sang@...el.com>
Subject: Re: [PATCH v4] sched/rt: move back to RT_GROUP_SCHED and rename it
 child


* Yajun Deng <yajun.deng@...ux.dev> wrote:

> The member back in struct sched_rt_entity only related to RT_GROUP_SCHED,
> it should not place out of RT_GROUP_SCHED, move back to RT_GROUP_SCHED
> and rename it child.
> 
> Init child when parent isn't NULL in init_tg_rt_entry().
> 
> Introduce for_each_sched_rt_entity_reverse() to iterate rt_se from
> top to down.
> 
> Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>
> Reported-by: kernel test robot <oliver.sang@...el.com>
> Closes: https://lore.kernel.org/oe-lkp/202308031034.4369b15b-oliver.sang@intel.com

Yeah, so I agree with these changes, but could you please split up this 
patch into 3 separate patches:

   sched/rt: Move sched_rt_entity::back to under the CONFIG_RT_GROUP_SCHED block
   sched/rt: Rename sched_rt_entity::back to sched_rt_entity::child
   sched/rt: Introduce for_each_sched_rt_entity_reverse() & use it

Thanks,

	Ingo