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Date:   Wed, 6 Jul 2022 14:40:07 +0200
From:   Florian Westphal <>
To:     Will Deacon <>
Cc:     Florian Westphal <>,
        Kajetan Puchalski <>,
        Pablo Neira Ayuso <>,
        Jozsef Kadlecsik <>,
        "David S. Miller" <>,
        Eric Dumazet <>,
        Jakub Kicinski <>,
        Paolo Abeni <>, Mel Gorman <>,,,,,,,,,,,
Subject: Re: [Regression] stress-ng udp-flood causes kernel panic on Ampere

Will Deacon <> wrote:
> On Wed, Jul 06, 2022 at 02:02:01PM +0200, Florian Westphal wrote:
> > +	/* ->status and ->timeout loads must happen after refcount increase */
> > +	smp_rmb();
> Sorry I didn't suggest this earlier, but if all of these smp_rmb()s are
> for upgrading the ordering from refcount_inc_not_zero() then you should
> use smp_acquire__after_ctrl_dep() instead. It's the same under the hood,
> but it illustrates what's going on a bit better.

Ok, I can replace it and send a v2, no problem.

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