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Date:   Fri, 8 Jan 2021 10:05:06 +0100
From:   Sebastian Siewior <>
To:     Ran Wang <>
Cc:     Peter Zijlstra <>,
        Thomas Gleixner <>,
        Jiafei Pan <>,
        "" <>,
        Ingo Molnar <>,
        Juri Lelli <>,
        Vincent Guittot <>,
        Dietmar Eggemann <>,
        Steven Rostedt <>,
        Ben Segall <>, Mel Gorman <>,
        "" <>
Subject: Re: [PATCH] [RFC] rt: kernel/sched/core: fix kthread_park() pending
 too long when CPU un-plugged

On 2021-01-08 08:45:14 [+0000], Ran Wang wrote:
> Hi Sebastian, Peter

> > I had a similar patch in -RT and dropped it in v5.10-rc7-rt16.
> > It was added because RT couldn't boot since creating the boot-threads didn't work before the ksoftirqd was up. This was fixed by commit
> >    26c7295be0c5e ("kthread: Do not preempt current task if it is going to call schedule()")
> I tried applying above commit to linux-5.6.y-rt, it could resolve my problem on LX2160ARDB, THANKS!

so in other words all this could have been avoided by using a supported
or maintained RT series. The v5.4 series has this patch, v5.6 isn't
maintained anymore so it is likely that there is more missing.


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