linux-kernel - Re: [PATCH] crypto: ccp: Remove forward declaration

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Date:   Mon, 24 Sep 2018 19:18:23 +0000
From:   Gary R Hook <ghook@....com>
To:     Nathan Chancellor <natechancellor@...il.com>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        "Hook, Gary" <Gary.Hook@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>
CC:     "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] crypto: ccp: Remove forward declaration

On 09/24/2018 12:26 PM, Nathan Chancellor wrote:
> Clang emits a warning about this construct:
> 
> drivers/crypto/ccp/sp-platform.c:36:36: warning: tentative array
> definition assumed to have one element
> static const struct acpi_device_id sp_acpi_match[];
>                                     ^
> 1 warning generated.
> 
> Just remove the forward declarations and move the initializations up
> so that they can be used in sp_get_of_version and sp_get_acpi_version.

I'm not going to out and out object to this just yet.

I am not a clang expert. Can you please provide a make command that 
would explain how you precipitated this complaint?


> Reported-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>   drivers/crypto/ccp/sp-platform.c | 53 +++++++++++++++-----------------
>   1 file changed, 25 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/crypto/ccp/sp-platform.c b/drivers/crypto/ccp/sp-platform.c
> index 71734f254fd1..b75dc7db2d4a 100644
> --- a/drivers/crypto/ccp/sp-platform.c
> +++ b/drivers/crypto/ccp/sp-platform.c
> @@ -33,8 +33,31 @@ struct sp_platform {
>   	unsigned int irq_count;
>   };
>   
> -static const struct acpi_device_id sp_acpi_match[];
> -static const struct of_device_id sp_of_match[];
> +static const struct sp_dev_vdata dev_vdata[] = {
> +	{
> +		.bar = 0,
> +#ifdef CONFIG_CRYPTO_DEV_SP_CCP
> +		.ccp_vdata = &ccpv3_platform,
> +#endif
> +	},
> +};
> +
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id sp_acpi_match[] = {
> +	{ "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(acpi, sp_acpi_match);
> +#endif
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id sp_of_match[] = {
> +	{ .compatible = "amd,ccp-seattle-v1a",
> +	  .data = (const void *)&dev_vdata[0] },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, sp_of_match);
> +#endif
>   
>   static struct sp_dev_vdata *sp_get_of_version(struct platform_device *pdev)
>   {
> @@ -201,32 +224,6 @@ static int sp_platform_resume(struct platform_device *pdev)
>   }
>   #endif
>   
> -static const struct sp_dev_vdata dev_vdata[] = {
> -	{
> -		.bar = 0,
> -#ifdef CONFIG_CRYPTO_DEV_SP_CCP
> -		.ccp_vdata = &ccpv3_platform,
> -#endif
> -	},
> -};
> -
> -#ifdef CONFIG_ACPI
> -static const struct acpi_device_id sp_acpi_match[] = {
> -	{ "AMDI0C00", (kernel_ulong_t)&dev_vdata[0] },
> -	{ },
> -};
> -MODULE_DEVICE_TABLE(acpi, sp_acpi_match);
> -#endif
> -
> -#ifdef CONFIG_OF
> -static const struct of_device_id sp_of_match[] = {
> -	{ .compatible = "amd,ccp-seattle-v1a",
> -	  .data = (const void *)&dev_vdata[0] },
> -	{ },
> -};
> -MODULE_DEVICE_TABLE(of, sp_of_match);
> -#endif
> -
>   static struct platform_driver sp_platform_driver = {
>   	.driver = {
>   		.name = "ccp",
>