netdev - Re: [PATCH net-next] net: Remove usage of net_device last

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Message-ID: <11021.1484761192@famine>
Date:   Wed, 18 Jan 2017 09:39:52 -0800
From:   Jay Vosburgh <jay.vosburgh@...onical.com>
To:     Tobias Klauser <tklauser@...tanz.ch>
cc:     netdev@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        intel-wired-lan@...ts.osuosl.org, devel@...verdev.osuosl.org,
        b.a.t.m.a.n@...ts.open-mesh.org,
        Eric Dumazet <eric.dumazet@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Mirko Lindner <mlindner@...vell.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH net-next] net: Remove usage of net_device last_rx member

Tobias Klauser <tklauser@...tanz.ch> wrote:

>The network stack no longer uses the last_rx member of struct net_device
>since the bonding driver switched to use its own private last_rx in
>commit 9f242738376d ("bonding: use last_arp_rx in slave_last_rx()").
>
>However, some drivers still (ab)use the field for their own purposes and
>some driver just update it without actually using it.
>
>Previously, there was an accompanying comment for the last_rx member
>added in commit 4dc89133f49b ("net: add a comment on netdev->last_rx")
>which asked drivers not to update is, unless really needed. However,
>this commend was removed in commit f8ff080dacec ("bonding: remove
>useless updating of slave->dev->last_rx"), so some drivers added later
>on still did update last_rx.
>
>Remove all usage of last_rx and switch three drivers (sky2, atp and
>smc91c92_cs) which actually read and write it to use their own private
>copy in netdev_priv.
>
>Compile-tested with allyesconfig and allmodconfig on x86 and arm.

Reviewed-by: Jay Vosburgh <jay.vosburgh@...onical.com>