[U-Boot] [PATCH 1/1] imx8: cpu: fix warning for cpu_imx_get_temp

[Stefan Agner <stefan@agner.ch>]

Hi Igor,

On 13.05.2019 12:46, Igor Opaniuk wrote:
> cpu_imx_get_temp() definition is wrapped with a ifdef macro,
> therefore all function references should be also wrapped the same way
> instead IS_ENABLED() usage.
> 
> Fix warning:
> arch/arm/mach-imx/imx8/cpu.c: In function ‘cpu_imx_get_desc’:
> arch/arm/mach-imx/imx8/cpu.c:612:40: warning: implicit declaration of
> function ‘cpu_imx_get_temp’; did you mean ‘cpu_imx_get_desc’?
> [-Wimplicit-function-declaration]
>    ret = snprintf(buf, size, " at %dC", cpu_imx_get_temp());
>                                         ^~~~~~~~~~~~~~~~
>                                         cpu_imx_get_desc
>                                         cpu_imx_get_desc
> 

Using IS_ENABLED is typically preferred over ifdef since it assures that
the code is compileable even if CONFIG_IMX_SCU_THERMAL is not enabled.

I'd rather prefer we drop the the ifdef around cpu_imx_get_temp(). The
linker will remove the function in case CONFIG_IMX_SCU_THERMAL is not
enabled.

--
Stefan

> Fixes: 82467cb217 ("imx8: cpu: get temperature when print cpu desc")
> Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
> ---
>  arch/arm/mach-imx/imx8/cpu.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm/mach-imx/imx8/cpu.c b/arch/arm/mach-imx/imx8/cpu.c
> index 12596c6387..616baed7cc 100644
> --- a/arch/arm/mach-imx/imx8/cpu.c
> +++ b/arch/arm/mach-imx/imx8/cpu.c
> @@ -606,11 +606,11 @@ int cpu_imx_get_desc(struct udevice *dev, char
> *buf, int size)
>  	ret = snprintf(buf, size, "NXP i.MX8%s Rev%s %s at %u MHz",
>  		       plat->type, plat->rev, plat->name, plat->freq_mhz);
>  
> -	if (IS_ENABLED(CONFIG_IMX_SCU_THERMAL)) {
> -		buf = buf + ret;
> -		size = size - ret;
> -		ret = snprintf(buf, size, " at %dC", cpu_imx_get_temp());
> -	}
> +#if defined(CONFIG_IMX_SCU_THERMAL)
> +	buf = buf + ret;
> +	size = size - ret;
> +	ret = snprintf(buf, size, " at %dC", cpu_imx_get_temp());
> +#endif
>  
>  	snprintf(buf + ret, size - ret, "\n");