linux-kernel - Re: [PATCH 5.10-rt+] drm/i915/gt: transform irq_disable into local

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Date:   Thu, 7 Oct 2021 19:19:29 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Joe Korty <joe.korty@...current-rt.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Clark Williams <williams@...hat.com>,
        Jun Miao <jun.miao@...driver.com>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5.10-rt+] drm/i915/gt: transform irq_disable into
 local_lock.

On 2021-10-07 12:59:28 [-0400], Joe Korty wrote:
> Convert IRQ blocking in intel_breadcrumbs_park() to a local lock.
> 
> Affects 5.10-rt and all later releases, up to and including when
> rt was merged into mainline.

RT was merged into mainline? Nobody tells me anything anymore… 

> This problem has been reported in two other linux-rt-users postings,
>   
>    [PREEMPT_RT] i915: fix PREEMPT_RT locking splats (Clark Williams)
>    [linux-5.12.y-rt] drm/i915/gt: Fix a lockdep warning with interrupts enabled (Jun Miao)
> 
> Neither of these submit the obvious solution, nor,
> AFAICT, has either yet been acted on.  So I muddy the
> waters further by submitting this, a third fix.

5.12 is longer maintained. Could you please take the latest devel tree
for testing and participate in
  https://lore.kernel.org/all/20211005150046.1000285-1-bigeasy@linutronix.de/

?

If anything I would prefer those patches backported into v5.10 if it is
affected.

Sebastian