linux-kernel - Re: [PATCH 03/21] powerpc: Mark the variable earlycon_acpi_spcr_enable maybe

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Date:   Sun, 04 Mar 2018 21:54:08 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Mathieu Malaterre <malat@...ian.org>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Jiri Slaby <jslaby@...e.com>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Mathieu Malaterre <malat@...ian.org>
Subject: Re: [PATCH 03/21] powerpc: Mark the variable earlycon_acpi_spcr_enable maybe_unused

Mathieu Malaterre <malat@...ian.org> writes:

> 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@...ian.org>
> ---
>  include/linux/serial_core.h | 1 +

I can't take this one as that's not a file I maintain.

The script says:

  $ ./scripts/get_maintainer.pl include/linux/serial_core.h
  gregkh@...uxfoundation.org
  jslaby@...e.com
  linux-kernel@...r.kernel.org


Can you resend it to them?

> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index b32df49a3bd5..4d14ecd7dbe8 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -379,6 +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
> +EARLYCON_USED_OR_UNUSED
>  static const bool earlycon_acpi_spcr_enable;

The macro eventually turns into an __attribute__, which I think is
typically placed after the variable, so eg:

  static const bool earlycon_acpi_spcr_enable EARLYCON_USED_OR_UNUSED;


cheers

>  static inline int setup_earlycon(char *buf) { return 0; }
>  #endif
> -- 
> 2.11.0