linux-kernel - Re: [PATCH] net: optimize cmpxchg in ip_idents

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Date:   Thu, 7 May 2020 06:49:46 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Shaokun Zhang <zhangshaokun@...ilicon.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, jinyuqi@...wei.com,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        guoyang2@...wei.com, Will Deacon <will@...nel.org>
Subject: Re: [PATCH] net: optimize cmpxchg in ip_idents_reserve

On Thu, May 7, 2020 at 2:12 AM Shaokun Zhang <zhangshaokun@...ilicon.com> 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.