netdev - Re: [PATCH net] net: Use this_cpu_inc() to increment net->core

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Message-ID: <YmULVVNRLrvW38zT@linutronix.de>
Date:   Sun, 24 Apr 2022 10:33:25 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        netdev <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH net] net: Use this_cpu_inc() to increment net->core_stats

On 2022-04-23 11:24:39 [+0200], Peter Zijlstra wrote:
> Eric is right. READ_ONCE() is 'required' to ensure the compiler doesn't
> split the load and KCSAN konws about these things.

So we should update the documentation and make sure that is done
tree-wide with the remote per-CPU access.
I will update that patch accordingly and add the other thing to my todo
list.

Sebastian