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

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Date: Thu, 16 May 2024 09:05:27 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: netdev@...r.kernel.org, masahiroy@...nel.org,
 Stephen Langstaff <stephenlangstaff1@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Alexander Lobakin <alobakin@...me>, Florian Fainelli <f.fainelli@...il.com>,
 Vladimir Oltean <olteanv@...il.com>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net] net: Always descend into dsa/ folder

On 5/16/24 01:58, Alexander Lobakin wrote:
> From: Florian Fainelli <florian.fainelli@...adcom.com>
> Date: Wed, 15 May 2024 20:33:45 -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.
>>
>> Fixes: 227d72063fcc ("dsa: simplify Kconfig symbols and dependencies")
>> Reported-by: Stephen Langstaff <stephenlangstaff1@...il.com>
>> Signed-off-by: Florian Fainelli <florian.fainelli@...adcom.com>
>> ---
>>   drivers/net/Makefile | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/Makefile b/drivers/net/Makefile
>> index 9c053673d6b2..0f6f0f091e0e 100644
>> --- a/drivers/net/Makefile
>> +++ b/drivers/net/Makefile
>> @@ -49,7 +49,7 @@ obj-$(CONFIG_MHI_NET) += mhi_net.o
>>   obj-$(CONFIG_ARCNET) += arcnet/
>>   obj-$(CONFIG_CAIF) += caif/
>>   obj-$(CONFIG_CAN) += can/
>> -obj-$(CONFIG_NET_DSA) += dsa/
>> +obj-y += dsa/
> 
> obj-$(CONFIG_NET_DSA:m=y) += dsa/
> 
> ?
> 
> or
> 
> ifdef CONFIG_NET_DSA
> obj-y += dsa/
> endif
> 
> I don't like always adding folders even if nothing will be built there
> as we then have a lot of folders with just empty built-in.a.

Sounds good, I prefer the second version which is clearer IMHO, will 
spin a v2 in the next few hours. Thanks!
-- 
Florian


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