On Tue, Oct 16, 2018 at 09:22:42AM +0200, Andrzej Hajda wrote:

> +int probe_err(const struct device *dev, int err, const char *fmt, ...)
> +{
> +	struct va_format vaf;
> +	va_list args;

...

> +	return err;
> +}
> +

This will need an EXPORT_SYMBOL for modules won't it?