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Date:   Thu, 6 Feb 2020 19:12:32 +0100
From:   "Jason A. Donenfeld" <>
To:     Eric Dumazet <>
Cc:, Netdev <>,
        LKML <>,
        Marco Elver <>
Subject: Re: [PATCH v3] skbuff: fix a data race in skb_queue_len()

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)

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