linux-kernel - Re: [PATCH net-next] net: dsa: User per-cpu 64-bit statistics

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Message-ID: <1503406611.2499.16.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Tue, 22 Aug 2017 05:56:51 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: dsa: User per-cpu 64-bit statistics

On Mon, 2017-08-21 at 17:10 -0700, Florian Fainelli wrote:

> Well if we return 1 from atomic_inc_return() and the previous value was
> zero, of course we are going to be bugging here. The idea behind the
> patch I suppose is to make sure that we always get an odd number upon
> u64_stats_update_begin()/entry, and an even number upon
> u64_stats_update_end()/exit, right?

Yes, this is right.