linux-kernel - drivers/net/dsa/dsa_loop

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Date: Mon, 13 May 2024 15:43:57 +0100
From: Stephen Langstaff <stephenlangstaff1@...il.com>
To: andrew@...n.ch, f.fainelli@...in.com, olteanv@...in.com
Cc: linux-kernel@...r.kernel.org
Subject: drivers/net/dsa/dsa_loop_bdinfo.c build problems

Hi there.

I have come across an issue in the Linux kernel (6.8.7 and others) and
wondered whether I am doing something wrong?

In trying to test the dsa_loop module, I have found that the
dsa_loop_bdinfo module is not built when the following combination of
configuration items is set:

CONFIG_NET_DSA=y
CONFIG_NET_DSA_LOOP=m
CONFIG_FIXED_PHY=y

This combination can easily be obtained using make menuconfig.

It seems that driver/net/Makefile’s inclusion of the dsa directory as
an obj-m precludes the building of dsa_loop_bdinfo.c (which is an
obj-y):

driver/net/Makefile:
…
obj-$(CONFIG_NET_DSA) += dsa/
…

driver/net/dsa/Makefile:
…
ifdef CONFIG_NET_DSA_LOOP
obj-$(CONFIG_FIXED_PHY)         += dsa_loop_bdinfo.o
endif
…