linux-kernel - Re: [PATCH v4 01/21] nvmem: Mark nvmem_type_str array with __maybe

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Date:   Wed, 28 Nov 2018 22:05:47 +0100
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>, linux-rtc@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>, Joe Perches <joe@...ches.com>,
        Mark Salyzyn <salyzyn@...roid.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-kernel@...r.kernel.org,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: Re: [PATCH v4 01/21] nvmem: Mark nvmem_type_str array with
 __maybe_unused

On 28/11/2018 21:05:17+0200, Andy Shevchenko wrote:
> Since we put static variable to a header file it's copied to each module
> that includes the header. But not all of them are actually using it.
> 
> Mark nvmem_type_str array with __maybe_unused to make a compiler happy:
> 
> In file included from include/linux/rtc.h:18,
>                  from drivers/rtc/rtc-proc.c:15:
> include/linux/nvmem-provider.h:29:27: warning: ‘nvmem_type_str’ defined but not used [-Wunused-const-variable=]
>  static const char * const nvmem_type_str[] = {
>                            ^~~~~~~~~~~~~~
> 
> Cc: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  include/linux/nvmem-provider.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
> index 00ff92571683..e33919ddb026 100644
> --- a/include/linux/nvmem-provider.h
> +++ b/include/linux/nvmem-provider.h
> @@ -26,7 +26,7 @@ enum nvmem_type {
>  	NVMEM_TYPE_BATTERY_BACKED,
>  };
>  
> -static const char * const nvmem_type_str[] = {
> +static const __maybe_unused char * const nvmem_type_str[] = {

Hum, it is probably better to move the array to nvmem/core.c. I should
have done that from the beginning.

>  	[NVMEM_TYPE_UNKNOWN] = "Unknown",
>  	[NVMEM_TYPE_EEPROM] = "EEPROM",
>  	[NVMEM_TYPE_OTP] = "OTP",
> -- 
> 2.19.2
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com