netdev - Re: [PATCH net-next v8 0/4] net: Add Keystone NetCP ethernet driver support

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Message-ID: <20343006.1NmdQEM9nn@wuerfel>
Date:	Wed, 28 Jan 2015 22:03:09 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Murali Karicheri <m-karicheri2@...com>
Cc:	David Miller <davem@...emloft.net>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v8 0/4] net: Add Keystone NetCP ethernet driver support

On Wednesday 28 January 2015 15:43:57 Murali Karicheri wrote:
> > this. Hope I am on the right track.
> 
> Reproduced this. Following errors seen when building the modules.
> 
>    LD [M]  drivers/net/ethernet/ti/keystone_netcp.o
> drivers/net/ethernet/ti/netcp_ethss.o: In function `init_module':
> netcp_ethss.c:(.init.text+0x0): multiple definition of `init_module'
> drivers/net/ethernet/ti/netcp_core.o:netcp_core.c:(.init.text+0x0): 
> first defined here
> drivers/net/ethernet/ti/netcp_ethss.o: In function `cleanup_module':
> netcp_ethss.c:(.exit.text+0x0): multiple definition of `cleanup_module'
> drivers/net/ethernet/ti/netcp_core.o:netcp_core.c:(.exit.text+0x0): 
> first defined here
> make[4]: *** [drivers/net/ethernet/ti/keystone_netcp.o] Error 1
>
> BTW, I had to disable cpsw_ale.c to get to build keystone NetCP. I am 
> assuming someone from TI is addressing this.
> 
> drivers/net/ethernet/ti/cpsw_ale.c: In function ‘cpsw_ale_start’:
> drivers/net/ethernet/ti/cpsw_ale.c:759:2: error: ‘KBUILD_MODNAME’ 
> undeclared (first use in this function)
> drivers/net/ethernet/ti/cpsw_ale.c:759:2: note: each undeclared 
> identifier is reported only once for each function it appears in

I think both problems are nontrivial to fix. The first one is obviously
that there are multiple init_module functions in one module. You have
to either split the driver into multiple loadable modules with at most
one init_module/cleanup_module pair each, or call one of the functions
from the other one in the right order.

The second problem is where I got stuck myself: cpsw_ale.c (also cpts.c)
is getting linked into both modules, which is not allowed: It is
impossible for the kernel to compile these if one driver is a module
and the other one is not, and any use of KBUILD_MODNAME fails because
it is unclear what the modname is if the file is compiled once to
be linked into two drivers.

	Arnd
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