linux-kernel - Re: [PATCH v2] crypto - img-hash: Depend on OF and silence compile test warning

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Message-ID: <ZB14gXqnkBzhdm0i@gondor.apana.org.au>
Date:   Fri, 24 Mar 2023 18:16:33 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH v2] crypto - img-hash: Depend on OF and silence compile
 test warning

On Sun, Mar 19, 2023 at 03:44:39PM +0100, Krzysztof Kozlowski wrote:
> The driver is specific to OF platforms (can match only via OF table),
> thus add dependency on CONFIG_OF.  Mark the of_device_id table as
> unused.  This also fixes W=1 warning:
> 
>   drivers/crypto/img-hash.c:930:34: error: ‘img_hash_match’ defined but not used [-Werror=unused-const-variable=]
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

You should either add a dependency on OF or __maybe_unused.
Adding both makes no sense.

Anyway, what is your final goal here? If it is to get rid of
of_match_ptr because of_match_table has been unconditinoal for
over 10 years then just do it in one giant patch rather than
evaluating every single driver with of_match_table as to whether
they can be used through ACPI or not.

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt