linux-kernel - Re: [PATCH 4/4] iio: proximity: sx9500: Mark ACPI and OF related data as maybe unused

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Date:   Sat, 11 Mar 2023 13:30:01 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Marek Vasut <marek.vasut@...il.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Robert Eshleman <bobbyeshleman@...il.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] iio: proximity: sx9500: Mark ACPI and OF related data
 as maybe unused

On 11/03/2023 13:28, Jonathan Cameron wrote:
> On Sat, 11 Mar 2023 12:14:57 +0100
> Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
> 
>> The driver can be compile tested with !CONFIG_OF or !CONFIG_ACPI making
>> certain data unused:
>>
>>   drivers/iio/proximity/sx9500.c:1039:34: error: ‘sx9500_of_match’ defined but not used [-Werror=unused-const-variable=]
>>
>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> Hi Krysztof
> 
> Thanks for looking at these warnings. 
> 
> Drop the protection macros instead.  The tables are trivial in size and
> the of_match_ptr() breaks some ways this driver can be used.
> ACPI_PTR() isn't as bad, but is pretty much pointless given this size of
> the array. 
> 

For ACPI platform, ACPI table is used, so nothing for PRP0001. For OF
platform, OF table is used.

What usage exactly is broken here? What ways?

Best regards,
Krzysztof