Re: [PATCH v4] sched/rt: move back to RT_GROUP_SCHED and rename it child

[Yajun Deng <yajun.deng@linux.dev>]

On 2023/10/3 17:51, Ingo Molnar wrote:
> * Yajun Deng <yajun.deng@linux.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@linux.dev>
>> Reported-by: kernel test robot <oliver.sang@intel.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

Okay, This patch makes sense, it saves a few bytes. But Peter seems to 
have a different opinion.

@Peter, I think I split up this patch into 2 separate patches:

          sched/rt: Introduce for_each_sched_rt_entity_back() & use it

         sched/rt: Move sched_rt_entity::back to under the 
CONFIG_RT_GROUP_SCHED block

Comments, please...

>
> Thanks,
>
> 	Ingo