linux-kernel - Re: commit 3d5bfbd97163 versus -rt

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Message-ID: <20210615113312.0dad32bb@oasis.local.home>
Date:   Tue, 15 Jun 2021 11:33:12 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Rasmus Villemoes <rasmus.villemoes@...vas.dk>
Cc:     Song Hui <hui.song_1@....com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-rt-users@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Esben Haabendal <esben@...nix.com>
Subject: Re: commit 3d5bfbd97163 versus -rt

On Tue, 15 Jun 2021 14:35:27 +0200
Rasmus Villemoes <rasmus.villemoes@...vas.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