linux-kernel - Re: [PATCH] crypto: qcom-rng - Fix qcom_rng_of

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Date:   Wed, 3 Aug 2022 17:55:24 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: [PATCH] crypto: qcom-rng - Fix qcom_rng_of_match unused warning

On 29-07-22, 17:35, Herbert Xu wrote:
> On Sun, Jul 24, 2022 at 08:12:39AM +0800, kernel test robot wrote:
> >
> > >> drivers/crypto/qcom-rng.c:190:34: warning: 'qcom_rng_of_match' defined but not used [-Wunused-const-variable=]
> >      190 | static const struct of_device_id qcom_rng_of_match[] = {
> >          |                                  ^~~~~~~~~~~~~~~~~
> 
> ---8<---
> Module device tables need to be declared as maybe_unused because
> they will be unused when built-in and the corresponding option is
> also disabled.
> 
> This patch adds the maybe_unused attributes to OF and ACPI.  This
> also allows us to remove the ifdef around the ACPI data structure.

Reviewed-by: Vinod Koul <vkoul@...nel.org>

> 
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
> 
> diff --git a/drivers/crypto/qcom-rng.c b/drivers/crypto/qcom-rng.c
> index 031b5f701a0a..72dd1a4ebac4 100644
> --- a/drivers/crypto/qcom-rng.c
> +++ b/drivers/crypto/qcom-rng.c
> @@ -9,6 +9,7 @@
>  #include <linux/crypto.h>
>  #include <linux/io.h>
>  #include <linux/iopoll.h>
> +#include <linux/kernel.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
> @@ -201,15 +202,13 @@ static int qcom_rng_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> -#if IS_ENABLED(CONFIG_ACPI)
> -static const struct acpi_device_id qcom_rng_acpi_match[] = {
> +static const struct acpi_device_id __maybe_unused qcom_rng_acpi_match[] = {
>  	{ .id = "QCOM8160", .driver_data = 1 },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(acpi, qcom_rng_acpi_match);
> -#endif
>  
> -static const struct of_device_id qcom_rng_of_match[] = {
> +static const struct of_device_id __maybe_unused qcom_rng_of_match[] = {
>  	{ .compatible = "qcom,prng", .data = (void *)0},
>  	{ .compatible = "qcom,prng-ee", .data = (void *)1},
>  	{}
> -- 
> 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

-- 
~Vinod