netdev - Re: [patch 07/14] tasklets: Prevent tasklet_unlock_spin

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Message-ID: <87y2ev4da1.fsf@nanos.tec.linutronix.de>
Date:   Wed, 10 Mar 2021 09:35:18 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        "Ahmed S. Darwish" <a.darwish@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        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 07/14] tasklets: Prevent tasklet_unlock_spin_wait() deadlock on RT

On Tue, Mar 09 2021 at 16:21, Sebastian Andrzej Siewior wrote:

> On 2021-03-09 16:00:37 [+0100], To Thomas Gleixner wrote:
>> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
>> index 07c7329d21aa7..1c14ccd351091 100644
>> --- a/include/linux/interrupt.h
>> +++ b/include/linux/interrupt.h
>> @@ -663,15 +663,6 @@ static inline int tasklet_trylock(struct tasklet_struct *t)
>>  void tasklet_unlock(struct tasklet_struct *t);
>>  void tasklet_unlock_wait(struct tasklet_struct *t);
>>  
>> -/*
>> - * Do not use in new code. Waiting for tasklets from atomic contexts is
>> - * error prone and should be avoided.
>> - */
>> -static inline void tasklet_unlock_spin_wait(struct tasklet_struct *t)
>> -{
>> -	while (test_bit(TASKLET_STATE_RUN, &t->state))
>> -		cpu_relax();
>> -}
>
> Look at that. The forward declaration for tasklet_unlock_spin_wait()
> should have remained. Sorry for that.

No idea how I managed to mess that up and fail to notice. Brown
paperbags to the rescue.

Thanks,

        tglx