linux-kernel - Re: Linux 6.3-rc2

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Message-ID: <ZA+w7d3RqGN/hAoM@localhost.localdomain>
Date:   Tue, 14 Mar 2023 00:25:33 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.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

Le Mon, Mar 13, 2023 at 04:17:06PM -0700, Linus Torvalds a écrit :
> 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?

Right but these two values are always modified within the same IRQs
disabled section.