linux-kernel - Re: drivers/net/dsa/dsa_loop

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Message-ID: <e307a237-68e3-40c9-be31-4fe3d560ada2@lunn.ch>
Date: Mon, 13 May 2024 19:54:33 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Stephen Langstaff <stephenlangstaff1@...il.com>
Cc: Florian Fainelli <f.fainelli@...il.com>, linux-kernel@...r.kernel.org,
	"OlteanV@...il.com" <OlteanV@...il.com>
Subject: Re: drivers/net/dsa/dsa_loop_bdinfo.c build problems

On Mon, May 13, 2024 at 06:40:19PM +0100, Stephen Langstaff wrote:
> On Mon, May 13, 2024 at 5:54 PM Andrew Lunn <andrew@...n.ch> wrote:
> > As Florian pointed out, dsa_loop_bdinfo.o should be built into your
> > kernel. When you insmod dsa_loop.ko, it should match the data in
> > dsa_loop_bdinfo to the dsa_loop driver an instantiate an instance of
> > it. Do you see that happening?
> 
> Well, if I fiddle with the Makefiles to get dsa_loop_bdinfo built as a
> module (as opposed to not building at all) then I see the following
> behaviour:
> 
> root@...hine:~/dsa_test# ls
> dsa_loop.ko  dsa_loop_bdinfo.ko
> root@...hine:~/dsa_test# modprobe dsa_core
> root@...hine:~/dsa_test# insmod dsa_loop_bdinfo.ko
> root@...hine:~/dsa_test# insmod dsa_loop.ko
> root@...hine:~/dsa_test# lsmod
> Module                  Size  Used by
> dsa_loop               16384  0
> dsa_loop_bdinfo        16384  0
> dsa_core              118784  1 dsa_loop
> ...
> 
> ...and I see no new interfaces reported by ifconfig -a
> [just the existing eth0, eth1 and lo0 interfaces]
> 
> I will revert my changes to the Makefiles and confirm that
> dsa_loop_bdinfo.o does not get built into the kernel - that's an
> overnight build for me so bye for now!

I think most developer cross compile the kernel on a big machine. I
also tend to build in everything i need, so its all in one file, which
i get uboot to tftpboot. It makes the whole build/boot/crash cycle
much master.

     Andrew