Messages in this thread | | | Subject | Re: [PATCH v3] skbuff: fix a data race in skb_queue_len() | From | Eric Dumazet <> | Date | Thu, 6 Feb 2020 10:22:02 -0800 |
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On 2/6/20 10:12 AM, Jason A. Donenfeld wrote: > On Thu, Feb 6, 2020 at 6:10 PM Eric Dumazet <eric.dumazet@gmail.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) >
Dmitry Vyukov had a nice suggestion few months back how to implement this.
https://lkml.org/lkml/2019/10/5/6
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