Re: [PATCH] powerpc: Mark the variable earlycon_acpi_spcr_enable maybe_unused

From: Mathieu Malaterre
Date: Thu Mar 15 2018 - 03:10:29 EST


On Thu, Mar 15, 2018 at 1:54 AM, Michael Ellerman <mpe@xxxxxxxxxxxxxx> wrote:
> Mathieu Malaterre <malat@xxxxxxxxxx> 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

Ah, right. I should have double-checked when re-sending this one.

Greg, do you want a v2 ?

> 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: âearlycon_acpi_spcr_enableâ 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@xxxxxxxxxx>
>> ---
>> 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