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

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Message-ID: <20231003163719.GG1539@noisy.programming.kicks-ass.net>
Date:   Tue, 3 Oct 2023 18:37:19 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Yajun Deng <yajun.deng@...ux.dev>
Cc:     Ingo Molnar <mingo@...nel.org>, mingo@...hat.com,
        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

On Tue, Oct 03, 2023 at 10:55:50PM +0800, Yajun Deng wrote:

> @Peter, I think I split up this patch into 2 separate patches:
> 
>          sched/rt: Introduce for_each_sched_rt_entity_back() & use it

Why ?? Having that macro makes no sense what so ever. You can't use it,
unless you set up the back pointers first. It is not a self contained
piece of functionality.

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

This one sure.