netdev - Re: [PATCH net-next 1/6] r8169: change driver data type

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Message-ID: <20200530221717.400033de@hermes.lan>
Date:   Sat, 30 May 2020 22:17:17 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 1/6] r8169: change driver data type

On Sat, 30 May 2020 23:54:36 +0200
Heiner Kallweit <hkallweit1@...il.com> wrote:

> Change driver private data type to struct rtl8169_private * to avoid
> some overhead.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---

Are you sure about this. Using netdev_priv() is actually at a fixed
offset from netdev, and almost always the compiler can optimize and
use one register.  Look at the assembly code difference of what you
did.