Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Message-ID: <1581058605.7924.15.camel@gmx.de>
Subject: Re: [ANNOUNCE] v5.4.17-rt9
From:   Mike Galbraith <efault@gmx.de>
To:     Fernando Lopez-Lezcano <nando@ccrma.Stanford.EDU>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Thomas Gleixner <tglx@linutronix.de>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        linux-rt-users <linux-rt-users@vger.kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>
Date:   Fri, 07 Feb 2020 07:56:45 +0100
In-Reply-To: <a6a9ba66-4e63-8156-2e49-291087d9e847@ccrma.stanford.edu>
References: <20200204165811.imc5lvs3wt3soaw2@linutronix.de>
         <cda47e2f-fd9d-c4c8-7991-64fef38af0ef@ccrma.stanford.edu>
         <1581055866.25780.7.camel@gmx.de>
         <a6a9ba66-4e63-8156-2e49-291087d9e847@ccrma.stanford.edu>
Content-Type: text/plain; charset="ISO-8859-15"
Mime-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, 2020-02-06 at 22:13 -0800, Fernando Lopez-Lezcano wrote:
> On 2/6/20 10:11 PM, Mike Galbraith wrote:
> > On Thu, 2020-02-06 at 15:59 -0800, Fernando Lopez-Lezcano wrote:
> >> On 2/4/20 8:58 AM, Sebastian Andrzej Siewior wrote:
> >>> Dear RT folks!
> >>>
> >>> I'm pleased to announce the v5.4.17-rt9 patch set.
> >>
> >> Thanks!
> >> I see a continuous stream of these:
> >
> > (snips gripage)
> >
> > Yup, d67739268cf0 annoys RT locking if lockdep is enabled.  The below
> > shut it up for my i915 equipped lappy.
>
> Wow, Mike, thanks!, will try it out and report...
> (might take me a couple of days)

I suspect you could just change the IS_ENABLED line to exclude
CONFIG_PREEMPT_RT from the lockdep hack instead.  Replacing
local_irq_disable() with a local lock is the routine fix, but in this
case it more closely resembles putting a bandaid on a bandaid :)

	-Mike