linux-kernel - Re: [PATCH] dpaa: avoid linking objects into multiple modules

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Message-ID: <ZMAqPdO2XcIXOCFs@corigine.com>
Date:   Tue, 25 Jul 2023 22:02:05 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Russell King <linux@...linux.org.uk>,
        Robert-Ionut Alexa <robert-ionut.alexa@....com>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Sean Anderson <sean.anderson@...o.com>,
        Josua Mayer <josua@...id-run.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dpaa: avoid linking objects into multiple modules

On Tue, Jul 25, 2023 at 08:43:40AM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Each object file contains information about which module it gets linked
> into, so linking the same file into multiple modules now causes a warning:
> 
> scripts/Makefile.build:254: drivers/net/ethernet/freescale/dpaa2/Makefile: dpaa2-mac.o is added to multiple modules: fsl-dpaa2-eth fsl-dpaa2-switch
> scripts/Makefile.build:254: drivers/net/ethernet/freescale/dpaa2/Makefile: dpmac.o is added to multiple modules: fsl-dpaa2-eth fsl-dpaa2-switch
> 
> Chang the way that dpaa2 is built by moving the two common files into a
> separate module with exported symbols instead.
> 
> To avoid a link failure when the switch driver is built-in, but the dpio driver
> is a loadable module, add the same dependency in there that exists for
> the ethernet driver.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Hi Arnd,

overall this looks good to me.
One thing that I noticed, and I'm not sure if we care,
is that an x86_64 allmodconfig now reports:

WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/net/ethernet/freescale/dpaa2/fsl-dpaa2-common.o