linux-kernel - Re: [patch V2 9/9] tasklets: Prevent kill/unlock

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Message-ID: <20201207153908.5orqlhp3v5xoat63@linutronix.de>
Date:   Mon, 7 Dec 2020 16:39:08 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paul McKenney <paulmck@...nel.org>
Subject: Re: [patch V2 9/9] tasklets: Prevent kill/unlock_wait deadlock on RT

On 2020-12-07 16:22:07 [+0100], Thomas Gleixner wrote:
> On Mon, Dec 07 2020 at 15:00, Sebastian Andrzej Siewior wrote:
> > So we keep the RT part as-is and replace the non-RT bits with this?
> 
> No. It would work for both.

So instead of boosting our way through we simply wait until the tasklet
completes. Given that canceling is usually done on start/stop events, it
shouldn't matter if the RT priority is lost.

Sebastian