linux-kernel - Re: [PATCH 01/12] net: dsa: lantiq_gswip: mark OF related data as maybe unused

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Date:   Sun, 12 Mar 2023 11:20:38 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Colin Foster <colin.foster@...advantage.com>,
        Michael Hennerich <michael.hennerich@...log.com>,
        Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-wpan@...r.kernel.org
Subject: Re: [PATCH 01/12] net: dsa: lantiq_gswip: mark OF related data as
 maybe unused

On 11/03/2023 19:14, Vladimir Oltean wrote:
> On Sat, Mar 11, 2023 at 06:32:52PM +0100, Krzysztof Kozlowski wrote:
>> The driver can be compile tested with !CONFIG_OF making certain data
>> unused:
>>
>>   drivers/net/dsa/lantiq_gswip.c:1888:34: error: ‘xway_gphy_match’ defined but not used [-Werror=unused-const-variable=]
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>> ---
> 
> Do you happen to have any context as to why of_match_node() without
> CONFIG_OF is implemented as:
> 
> #define of_match_node(_matches, _node)	NULL
> 
> and not as:
> 
> static inline const struct of_device_id *
> of_match_node(const struct of_device_id *matches,
> 	      const struct device_node *node)
> {
> 	return NULL;
> }
> 
> ?
> 
> Generally, the static inline shim function model is nicer, because it
> allows us to not scatter __maybe_unused all around.

Sorry, I don't follow. I don't touch that wrappers, just fix errors
related to OF device ID tables, although in few cases it is indeed
related to of_match_node.

Best regards,
Krzysztof