linux-kernel - Re: Linux 6.3-rc2

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Message-ID: <CAHk-=whwQxk12jfe28DV4-1-d9np1hKFtTy-ua=F4EcT8jcOOA@mail.gmail.com>
Date:   Mon, 13 Mar 2023 16:17:06 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 6.3-rc2

On Mon, Mar 13, 2023 at 4:11 PM Frederic Weisbecker <frederic@...nel.org> wrote:
>
> So the hardirq interrupted some code that has softirqs disabled (or
> servicing) from the preempt mask POV but not from lockdep POV.

.. but those are two different counters, so isn't that *always* racy?
IOW, one counter being updated before the other...

IOW, isn't this *why* that check isn't supposed to ever trigger at all
from hard-irq context?

               Linus