Re: [PATCH v3] skbuff: fix a data race in skb_queue_len()

[Jason A. Donenfeld]

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