linux-kernel - Re: [PATCH 1/2] hwmon: gpio-fan: mark OF related data as maybe unused

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Date:   Sun, 12 Mar 2023 19:08:11 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Jean Delvare <jdelvare@...e.com>,
        Eric Tremblay <etremblay@...tech-controls.com>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] hwmon: gpio-fan: mark OF related data as maybe unused

On 12/03/2023 19:06, Guenter Roeck wrote:
> On Sat, Mar 11, 2023 at 12:16:09PM +0100, Krzysztof Kozlowski wrote:
>> The driver can be compile tested with !CONFIG_OF making certain data
>> unused:
>>
>>   drivers/hwmon/gpio-fan.c:484:34: error: ‘of_gpio_fan_match’ defined but not used [-Werror=unused-const-variable=]
>>
> 
> How do you trigger that ? The driver depends on OF_GPIO which
> in turn depends on OF. Arguably that means that of_match_ptr()
> doesnot really make sense, but still I don't see how you can
> trigger the above error message.

I can drop of_match_ptr, it's indeed in many cases not needed.

I just build x86_64 allyesconfig minus OF, with W=1.

Do you want to me to drop of_match_ptr?

Best regards,
Krzysztof