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

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Date:   Mon, 24 Aug 2020 13:59:56 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Sasha Levin <sashal@...nel.org>
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

Hi Sasha,

On Wed, Aug 12, 2020 at 05:34:30PM +0300, Vladimir Oltean wrote:
> 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

Do you think that this type of request is something that AUTOSEL can
handle?

Thanks,
-Vladimir