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From:   Michael Ellerman <mpe@ellerman.id.au>
To:     Mathieu Malaterre <malat@debian.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Mathieu Malaterre <malat@debian.org>, Jiri Slaby <jslaby@suse.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] powerpc: Mark the variable earlycon_acpi_spcr_enable maybe_unused
In-Reply-To: <20180310180645.7014-1-malat@debian.org>
References: <20180310180645.7014-1-malat@debian.org>
Date:   Thu, 15 Mar 2018 11:54:06 +1100
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Mathieu Malaterre <malat@debian.org> writes:
> Subject: Re: [PATCH] powerpc: Mark the variable earlycon_acpi_spcr_enable maybe_unused

You're fixing an error on powerpc, but the patch is to the serial code,
so the subject should probably be more like:

  serial: core: Mark the variable earlycon_acpi_spcr_enable maybe_unused

cheers

> Re-use the object-like macro EARLYCON_USED_OR_UNUSED to mark
> `earlycon_acpi_spcr_enable` as maybe_unused.
>
> Fix the following warning (treated as error in W=1)
>
>   CC      arch/powerpc/kernel/setup-common.o
> In file included from ./include/linux/serial_8250.h:14:0,
>                  from arch/powerpc/kernel/setup-common.c:33:
> ./include/linux/serial_core.h:382:19: error: ‘earlycon_acpi_spcr_enable’ defined but not used [-Werror=unused-const-variable=]
>  static const bool earlycon_acpi_spcr_enable;
>                    ^~~~~~~~~~~~~~~~~~~~~~~~~
> cc1: all warnings being treated as errors
>
> Signed-off-by: Mathieu Malaterre <malat@debian.org>
> ---
>  include/linux/serial_core.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index b32df49a3bd5..1d356105f25a 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -379,7 +379,7 @@ extern int of_setup_earlycon(const struct earlycon_id *match,
>  extern bool earlycon_acpi_spcr_enable __initdata;
>  int setup_earlycon(char *buf);
>  #else
> -static const bool earlycon_acpi_spcr_enable;
> +static const bool earlycon_acpi_spcr_enable EARLYCON_USED_OR_UNUSED;
>  static inline int setup_earlycon(char *buf) { return 0; }
>  #endif
>  
> -- 
> 2.11.0