linux-kernel - Re: [PATCH RT 03/25] sched/deadline: Ensure inactive

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Date:   Tue, 25 Feb 2020 15:50:06 +0100
From:   Juri Lelli <juri.lelli@...hat.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     zanussi@...nel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Carsten Emde <C.Emde@...dl.org>,
        John Kacur <jkacur@...hat.com>, Daniel Wagner <wagi@...om.org>
Subject: Re: [PATCH RT 03/25] sched/deadline: Ensure inactive_timer runs in
 hardirq context

Hi,

On 24/02/20 09:33, Sebastian Andrzej Siewior wrote:
> On 2020-02-21 15:24:31 [-0600], zanussi@...nel.org wrote:
> > [ Upstream commit ba94e7aed7405c58251b1380e6e7d73aa8284b41 ]
> > 
> > SCHED_DEADLINE inactive timer needs to run in hardirq context (as
> > dl_task_timer already does) on PREEMPT_RT
> 
> The message says "dl_task_timer already does" but this is not true for
> v4.14 as it still runs in softirq context on RT. v4.19 has this either
> via
>   https://lkml.kernel.org/r/20190731103715.4047-1-juri.lelli@redhat.com
> 
> or the patch which got merged upstream.
> 
> Juri, I guess we want this for v4.14, too?

Indeed. v4.14 needs this as well.

Thanks for noticing!

Best,

Juri