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Date:   Thu, 6 Feb 2020 10:22:02 -0800
From:   Eric Dumazet <>
To:     "Jason A. Donenfeld" <>,
        Eric Dumazet <>
Cc:, Netdev <>,
        LKML <>,
        Marco Elver <>,
        Dmitry Vyukov <>
Subject: Re: [PATCH v3] skbuff: fix a data race in skb_queue_len()

On 2/6/20 10:12 AM, Jason A. Donenfeld wrote:
> On Thu, Feb 6, 2020 at 6:10 PM Eric Dumazet <> wrote:
>> Unfortunately we do not have ADD_ONCE() or something like that.
> I guess normally this is called "atomic_add", unless you're thinking
> instead about something like this, which generates the same
> inefficient code as WRITE_ONCE:
> #define ADD_ONCE(d, s) *(volatile typeof(d) *)&(d) += (s)

Dmitry Vyukov had a nice suggestion few months back how to implement this.

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