netdev - Re: [PATCH net-next] ipv6: do lazy dst->__use update when per cpu dst is available

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Date:   Wed, 27 Sep 2017 11:25:05 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Wei Wang <weiwan@...gle.com>
Cc:     Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Martin KaFai Lau <kafai@...com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH net-next] ipv6: do lazy dst->__use update when per cpu dst
 is available

On Wed, Sep 27, 2017 at 10:44 AM, Wei Wang <weiwan@...gle.com> wrote:
> Another thing is that I don't really see any places making use of
> dst->__use. So maybe we can also get rid of this dst->__use field?

It is used in rtnl_put_cacheinfo():

        struct rta_cacheinfo ci = {
                .rta_lastuse = jiffies_delta_to_clock_t(jiffies - dst->lastuse),
                .rta_used = dst->__use,
                .rta_clntref = atomic_read(&(dst->__refcnt)),
                .rta_error = error,
                .rta_id =  id,
        };