linux-kernel - Re: [PATCH 0/6] x86/entry,lockdep: Improve IRQ state tracking

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Message-ID: <20200527164305.GB706495@hirez.programming.kicks-ass.net>
Date:   Wed, 27 May 2020 18:43:05 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     mingo@...nel.org, will@...nel.org, tglx@...utronix.de
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        a.darwish@...utronix.de, rostedt@...dmis.org, bigeasy@...utronix.de
Subject: Re: [PATCH 0/6] x86/entry,lockdep: Improve IRQ state tracking

On Wed, May 27, 2020 at 05:45:27PM +0200, Peter Zijlstra wrote:
> Ahmed and Sebastian wanted additional lockdep_assert*() macros and ran
> into header hell.
> 
> Move the IRQ state into per-cpu variables, which removes the dependency on
> task_struct, which is what generated the header-hell.
> 
> And fix IRQ state tracking to not be affected by lockdep_off() (it really
> should not have been anyway) and extends IRQ state tracking across (x86)
> NMIs.

After having it run kernel builds for a while, I've got a realy weird
(false-positive) lockdep_assert_irqs_enabled() trigger.

So something isn't quite right. I'll prod at it some moar.