linux-kernel - Re: [ANNOUNCE] v5.4.17-rt9

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Date:   Wed, 12 Feb 2020 11:20:06 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Mike Galbraith <efault@....de>
Cc:     Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [ANNOUNCE] v5.4.17-rt9

On 2020-02-07 07:11:06 [+0100], Mike Galbraith wrote:
> drm/i915/gt: use a LOCAL_IRQ_LOCK in __timeline_mark_lock()
> 
> Quoting drm/i915/gt: Mark up the nested engine-pm timeline lock as irqsafe
> 
>     We use a fake timeline->mutex lock to reassure lockdep that the timeline
>     is always locked when emitting requests. However, the use inside
>     __engine_park() may be inside hardirq and so lockdep now complains about
>     the mixed irq-state of the nested locked. Disable irqs around the
>     lockdep tracking to keep it happy.
> 
> This lockdep appeasement breaks RT because we take sleeping locks between
> __timeline_mark_lock()/unlock().  Use a LOCAL_IRQ_LOCK instead.
> 
> Signed-off-by: Mike Galbraith <efaukt@....de>

Applied, thank you.

Sebastian