linux-kernel - Re: [PATCH] ethernet: octeontx2: avoid linking objects into multiple modules

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Date: Thu, 30 May 2024 20:52:32 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Jacob Keller" <jacob.e.keller@...el.com>,
 "Arnd Bergmann" <arnd@...nel.org>, "Sunil Goutham" <sgoutham@...vell.com>,
 "Geetha sowjanya" <gakula@...vell.com>,
 "Subbaraya Sundeep Bhatta" <sbhatta@...vell.com>,
 hariprasad <hkelam@...vell.com>
Cc: "David S . Miller" <davem@...emloft.net>,
 "Eric Dumazet" <edumazet@...gle.com>, "Jakub Kicinski" <kuba@...nel.org>,
 "Paolo Abeni" <pabeni@...hat.com>,
 "Richard Cochran" <richardcochran@...il.com>,
 "Suman Ghosh" <sumang@...vell.com>, "Simon Horman" <horms@...nel.org>,
 "Anthony L Nguyen" <anthony.l.nguyen@...el.com>,
 "Jiri Pirko" <jiri@...nulli.us>,
 "Mateusz Polchlopek" <mateusz.polchlopek@...el.com>,
 Netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ethernet: octeontx2: avoid linking objects into multiple modules

On Thu, May 30, 2024, at 19:54, Jacob Keller wrote:
> On 5/28/2024 8:25 AM, 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/marvell/octeontx2/nic/Makefile: otx2_devlink.o is added to multiple modules: rvu_nicpf rvu_nicvf
>> 
>
> When I tried to build, I don't see any warnings produced on the current
> net-next with W=1. Is this something new and not yet in net-next tree?
> If not, how do I enable this warning in my local build?

The warning has been around with W=1 for over a year now, it still
shows up here:

make ARCH=arm64 allmodconfig drivers/net/ethernet/marvell/octeontx2/ -skj20
scripts/Makefile.build:236: drivers/net/ethernet/marvell/octeontx2/nic/Makefile: otx2_devlink.o is added to multiple modules: rvu_nicpf rvu_nicvf
scripts/Makefile.build:236: drivers/net/ethernet/marvell/octeontx2/nic/Makefile: otx2_dcbnl.o is added to multiple modules: rvu_nicpf rvu_nicvf

    Arnd