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From:   Vincent Guittot <vincent.guittot@linaro.org>
Date:   Mon, 21 Jun 2021 19:07:29 +0200
Message-ID: <CAKfTPtA21ZG3wwdFG-11Nq6NBFu_eOAdvYFMFJePoSMiS_+jcw@mail.gmail.com>
Subject: Re: [powerpc][5.13.0-rc7] Kernel warning (kernel/sched/fair.c:401)
 while running LTP tests
To:     Odin Ugedal <odin@uged.al>
Cc:     Sachin Sant <sachinp@linux.vnet.ibm.com>,
        open list <linux-kernel@vger.kernel.org>,
        linuxppc-dev@lists.ozlabs.org,
        Peter Zijlstra <peterz@infradead.org>
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On Mon, 21 Jun 2021 at 18:45, Odin Ugedal <odin@uged.al> wrote:
>
> man. 21. jun. 2021 kl. 18:22 skrev Vincent Guittot <vincent.guittot@linaro.org>:
> > I would prefer that we use the reason of adding the cfs in the list instead.
> >
> > Something like the below should also fixed the problem. It is based on a
> > proposal I made to Rik sometimes ago when he tried to flatten the rq:
> > https://lore.kernel.org/lkml/20190906191237.27006-6-riel@surriel.com/
> >
> > This will ensure that a cfs is added in the list whenever one of its  child
> > is still in the list.
>
> Oh, yeah, that is a much more elegant solution! It fixes the issue as well!
>
> Feel free to add this when/if you submit it as a patch:
> Acked-by: Odin Ugedal <odin@uged.al>

Thanks

>
> Odin