Re: [PATCH] resource: provide 0args DEFINE_RES variant for unset resource desc

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Wed, Dec 10, 2025 at 07:03:07PM +0100, Christian Marangi wrote:
> Provide a variant of DEFINE_RES that takes 0 arguments to inizialize an
> "unset" resource descriptor.
> 
> This should be used for the improper case of
> 
> 	struct resource res = {};
> 
> where DEFINE_RES() should be used.
> 
> With this new helper variant, it would result in:
> 
> 	struct resource res = DEFINE_RES();
> 
> instead of having to define the full 3 arguments:
> 
> 	struct resource res = DEFINE_RES(0, 0, IORESOURCE_UNSET);
> 
> DEFINE_RES() with no args, will set the flags to IORESOURCE_UNSET
> signaling the resource descriptor is UNSET and doesn't reflect an actual
> resource currently.

...

> +#define DEFINE_RES(...)							\
> +	CONCATENATE(__DEFINE_RES, COUNT_ARGS(__VA_ARGS__))		\
> +		    (__VA_ARGS__)
	CONCATENATE(__DEFINE_RES, COUNT_ARGS(__VA_ARGS__))(__VA_ARGS__)

Can be one line. Moreover, it will be even better to show that we imply
a function call here.

And this requires including args.h.

-- 
With Best Regards,
Andy Shevchenko