linux-kernel - Re: [patch 00/14] tasklets: Replace the spin wait loops and make it RT safe

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Message-ID: <YEeAghrP8cOk1zL9@hirez.programming.kicks-ass.net>
Date:   Tue, 9 Mar 2021 15:04:50 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Ahmed S. Darwish" <a.darwish@...utronix.de>,
        Denis Kirjanov <kda@...ux-powerpc.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        ath9k-devel@....qualcomm.com, Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org, Chas Williams <3chas3@...il.com>,
        linux-atm-general@...ts.sourceforge.net,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org,
        Stefan Richter <stefanr@...6.in-berlin.de>,
        linux1394-devel@...ts.sourceforge.net
Subject: Re: [patch 00/14] tasklets: Replace the spin wait loops and make it
 RT safe

On Tue, Mar 09, 2021 at 09:42:03AM +0100, Thomas Gleixner wrote:
> This is a follow up to the review comments of the series which makes
> softirq processing PREEMPT_RT safe:
> 
>  https://lore.kernel.org/r/20201207114743.GK3040@hirez.programming.kicks-ass.net
> 
> Peter suggested to replace the spin waiting in tasklet_disable() and
> tasklet_kill() with wait_event(). This also gets rid of the ill defined
> sched_yield() in tasklet_kill().
> 
> Analyzing all usage sites of tasklet_disable() and tasklet_unlock_wait() we
> found that most of them are safe to be converted to a sleeping wait.
> 
> Only a few instances invoke tasklet_disable() from atomic context. A few
> bugs which have been found in course of this analysis have been already
> addressed seperately.

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>