linux-kernel - Re: [RFC PATCH 2/3] lockdep: Merge hardirq_threaded and irq

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Date:   Mon, 23 Mar 2020 15:02:20 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 2/3] lockdep: Merge hardirq_threaded and irq_config
 together

On Mon, Mar 23, 2020 at 04:32:06AM +0100, Frederic Weisbecker wrote:
> These fields describe the same state: a code block running in hardirq
> that might be threaded under specific configurations.
> 
> Merge them together in the same field. Also rename the result as
> "hardirq_threadable" as we are talking about a possible state and not
> an actual one.

What isn't instantly obvious is that they cannot overlap. For instance
mainline with force threaded interrupt handlers on, can't that have the
irq_work nest inside a threaded handler ?

I *think* it just about works out, but it definitely wants a little more
than this.