linux-kernel - Re: [PATCH] ACPI / tables: Add an ifdef around amlcode and dsdt

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Date:   Thu, 20 Dec 2018 14:57:27 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] ACPI / tables: Add an ifdef around amlcode and
 dsdt_amlcode

On Thu, Dec 20, 2018 at 12:38:56PM -0700, Nathan Chancellor wrote:
> Clang warns:
> 
> drivers/acpi/tables.c:715:14: warning: unused variable 'amlcode'
> [-Wunused-variable]
> static void *amlcode __attribute__ ((weakref("AmlCode")));
>              ^
> drivers/acpi/tables.c:716:14: warning: unused variable 'dsdt_amlcode'
> [-Wunused-variable]
> static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
>              ^
> 2 warnings generated.
> 
> The only uses of these variables are hiddem behind CONFIG_ACPI_CUSTOM_DSDT
> so do the same thing here.
> 
> Fixes: 82e4eb4e9653 ("ACPI / tables: add DSDT AmlCode new declaration name support")
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---
>  drivers/acpi/tables.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c
> index ccb90eff00e5..48eabb6c2d4f 100644
> --- a/drivers/acpi/tables.c
> +++ b/drivers/acpi/tables.c
> @@ -712,8 +712,10 @@ acpi_os_physical_table_override(struct acpi_table_header *existing_table,
>  					  table_length);
>  }
>  
> +#ifdef CONFIG_ACPI_CUSTOM_DSDT
>  static void *amlcode __attribute__ ((weakref("AmlCode")));
>  static void *dsdt_amlcode __attribute__ ((weakref("dsdt_aml_code")));
> +#endif
>  
>  acpi_status
>  acpi_os_table_override(struct acpi_table_header *existing_table,
> -- 
> 2.20.1
> 

+ Nick for review