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From: Sebastian Andrzej Siewior <>
To: Mike Galbraith <>
Cc: Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>,
	Thomas Gleixner <>,
	LKML <>,
	linux-rt-users <>,
	Steven Rostedt <>
Subject: Re: [ANNOUNCE] v5.4.17-rt9
Date: Wed, 12 Feb 2020 11:20:06 +0100
Message-ID: <> (raw)
In-Reply-To: <>

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 <>

Applied, thank you.


      parent reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-04 16:58 Sebastian Andrzej Siewior
2020-02-06 23:59 ` Fernando Lopez-Lezcano
2020-02-07  6:11   ` Mike Galbraith
2020-02-07  6:13     ` Fernando Lopez-Lezcano
2020-02-07  6:56       ` Mike Galbraith
2020-02-12 10:20     ` Sebastian Andrzej Siewior [this message]

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