linux-kernel - Re: [PATCH net v2] net: Always descend into dsa/ folder with CONFIG_NET

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Date: Fri, 17 May 2024 17:17:43 +0200
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: Florian Fainelli <florian.fainelli@...adcom.com>
CC: <netdev@...r.kernel.org>, <stephenlangstaff1@...il.com>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Vladimir Oltean
	<olteanv@...il.com>, Florian Fainelli <f.fainelli@...il.com>, "Alexander
 Lobakin" <alobakin@...me>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net v2] net: Always descend into dsa/ folder with
 CONFIG_NET_DSA enabled

From: Florian Fainelli <florian.fainelli@...adcom.com>
Date: Thu, 16 May 2024 09:56:30 -0700

> Stephen reported that he was unable to get the dsa_loop driver to get
> probed, and the reason ended up being because he had CONFIG_FIXED_PHY=y
> in his kernel configuration. As Masahiro explained it:
> 
>   "obj-m += dsa/" means everything under dsa/ must be modular.
> 
>   If there is a built-in object under dsa/ with CONFIG_NET_DSA=m,
>   you cannot do  "obj-$(CONFIG_NET_DSA) += dsa/".
> 
>   You need to change it back to "obj-y += dsa/".
> 
> This was the case here whereby CONFIG_NET_DSA=m, and so the
> obj-$(CONFIG_FIXED_PHY) += dsa_loop_bdinfo.o rule is not executed and
> the DSA loop mdio_board info structure is not registered with the
> kernel, and eventually the device is simply not found.
> 
> To preserve the intention of the original commit of limiting the amount
> of folder descending, conditionally descend into drivers/net/dsa when
> CONFIG_NET_DSA is enabled.
> 
> Fixes: 227d72063fcc ("dsa: simplify Kconfig symbols and dependencies")
> Reported-by: Stephen Langstaff <stephenlangstaff1@...il.com>
> Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>

Reviewed-by: Alexander Lobakin <aleksander.lobakin@...el.com>

> ---
> Changes in v2:
> 
> - conditionally descend into the dsa folder based upon CONFIG_NET_DSA
> - change subject a bit to reflect the change
> 
>  drivers/net/Makefile | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/Makefile b/drivers/net/Makefile
> index 9c053673d6b2..13743d0e83b5 100644
> --- a/drivers/net/Makefile
> +++ b/drivers/net/Makefile
> @@ -49,7 +49,9 @@ obj-$(CONFIG_MHI_NET) += mhi_net.o
>  obj-$(CONFIG_ARCNET) += arcnet/
>  obj-$(CONFIG_CAIF) += caif/
>  obj-$(CONFIG_CAN) += can/
> -obj-$(CONFIG_NET_DSA) += dsa/
> +ifdef CONFIG_NET_DSA
> +obj-y += dsa/
> +endif
>  obj-$(CONFIG_ETHERNET) += ethernet/
>  obj-$(CONFIG_FDDI) += fddi/
>  obj-$(CONFIG_HIPPI) += hippi/

Thanks,
Olek