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Date:   Thu, 7 May 2020 06:49:46 -0700
From:   Eric Dumazet <>
To:     Shaokun Zhang <>
Cc:     Peter Zijlstra <>,
        Eric Dumazet <>,
        Arvind Sankar <>,
        David Miller <>,
        netdev <>,
        LKML <>,,
        Alexey Kuznetsov <>,
        Hideaki YOSHIFUJI <>,, Will Deacon <>
Subject: Re: [PATCH] net: optimize cmpxchg in ip_idents_reserve

On Thu, May 7, 2020 at 2:12 AM Shaokun Zhang <> wrote:
> Hi Peter/Eric,
> Shall we use atomic_add_return() unconditionally and add some comments? Or I missed
> something.

Yes. A big fat comment, because I do not want yet another bogus
complaint from someone playing with a buggy UBSAN.

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