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Date:   Tue, 15 Jun 2021 11:33:12 -0400
From:   Steven Rostedt <rostedt@goodmis.org>
To:     Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Cc:     Song Hui <hui.song_1@nxp.com>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        linux-rt-users@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Vladimir Oltean <vladimir.oltean@nxp.com>,
        Esben Haabendal <esben@geanix.com>
Subject: Re: commit 3d5bfbd97163 versus -rt
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On Tue, 15 Jun 2021 14:35:27 +0200
Rasmus Villemoes <rasmus.villemoes@prevas.dk> wrote:

> Reverting commit 3d5bfbd9716318b1ca5c38488aa69f64d38a9aa5 (gpio:
> mpc8xxx: change the gpio interrupt flags.) makes it go away, as does
> disabling CONFIG_PREEMPT_RT or simply booting a vanilla v5.10.42 (where
> that option exists but cannot be selected).

I'm curious if it will also trigger on vanilla v5.10.42 but add to the
kernel command line: threadirqs

Make sure you have CONFIG_IRQ_FORCED_THREADING set too.

Because it appears to be an issue with that being called by the generic
threaded irq infrastructure, which PREEMPT_RT enables automatically.


-- Steve