linux-kernel - Re: [PATCH net-next 2/2] enetc: use napi_schedule to be compatible with PREEMPT

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Message-ID: <20200812143430.xuzg2ddsl7ouhn5m@skbuf>
Date:   Wed, 12 Aug 2020 17:34:30 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     David Miller <davem@...emloft.net>, Jiafei.Pan@....com,
        kuba@...nel.org, netdev@...r.kernel.org, claudiu.manoil@....com,
        ioana.ciornei@....com, yangbo.lu@....com,
        linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] enetc: use napi_schedule to be compatible
 with PREEMPT_RT

On Wed, Aug 12, 2020 at 03:51:44PM +0200, Sebastian Andrzej Siewior wrote:
> On 2020-08-03 18:21:45 [-0700], David Miller wrote:
> > From: Vladimir Oltean <olteanv@...il.com>
> > > The driver calls napi_schedule_irqoff() from a context where, in RT,
> > > hardirqs are not disabled, since the IRQ handler is force-threaded.
> …
> > > 
> > > Signed-off-by: Jiafei Pan <Jiafei.Pan@....com>
> > > Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> > 
> > Applied.
> 
> Could these two patches be forwarded -stable, please? The changelog
> describes this as a problem on PREEMPT_RT but this also happens on !RT
> with the `threadirqs' commandline switch.
> 
> Sebastian

I expect the driver maintainers to have something to say about this. I
didn't test on stable kernels, and at least for dpaa2-eth, the change
would need to go pretty deep down the stable line.

Also, not really sure who is using the threadirqs option except for
testing purposes.

Thanks,
-Vladimir