From mboxrd@z Thu Jan  1 00:00:00 1970
References: <7bd62ff7-0f90-d881-4a5f-7a80091aa321@siemens.com>
From: Philippe Gerum <rpm@xenomai.org>
Subject: Re: dovetail: DEBUG_LOCKS_WARN_ON(!lockdep_stage_disabled())
In-reply-to: <7bd62ff7-0f90-d881-4a5f-7a80091aa321@siemens.com>
Date: Wed, 09 Jun 2021 18:00:49 +0200
Message-ID: <87eedb6n9q.fsf@xenomai.org>
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To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Xenomai <xenomai@xenomai.org>


Jan Kiszka <jan.kiszka@siemens.com> writes:

> Hi Philippe,
>
> currently trying to understand [1]: The check in
> lockdep_hardirqs_on_prepare triggers, e.g. over exc_int3 ->
> do_int3_user, and then on cond_local_irq_enable().
>
> Where should have the current stage be stalled after exc_int3 so that
> lockdep is happy?
>

Nowhere. v5.8 introduced irqentry_enter_from_user_mode() which raw
(debug) traps invoke directly, and this one does not reconcile the hard
irq state with the stall bit.

> Interestingly, I do not get this with my local .config, and I still
> didn't find the switches that make the difference.
>
> Jan
>
> [1] https://source.denx.de/Xenomai/xenomai-images/-/jobs/276895#L946


-- 
Philippe.