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Date:   Thu, 6 Feb 2020 19:12:32 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     cai@....pw, Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Marco Elver <elver@...gle.com>
Subject: Re: [PATCH v3] skbuff: fix a data race in skb_queue_len()

On Thu, Feb 6, 2020 at 6:10 PM Eric Dumazet <eric.dumazet@...il.com> 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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