Re: [PATCH v4 1/1] drm/i915: Move abs_diff() to math.h

[Andy Shevchenko]

On Thu, Aug 03, 2023 at 10:24:46AM -0700, Andrew Morton wrote:
> On Thu,  3 Aug 2023 16:19:18 +0300 Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:

...

> > +#define abs_diff(a, b) ({			\
> > +	typeof(a) __a = (a);			\
> > +	typeof(b) __b = (b);			\
> > +	(void)(&__a == &__b);			\
> > +	__a > __b ? (__a - __b) : (__b - __a);	\
> > +})
> 
> Can we document it please?
> 
> Also, the open-coded type comparison could be replaced with __typecheck()?
> 
> And why the heck isn't __typecheck() in typecheck.h, to be included by
> minmax.h.
> 
> etcetera.  Sigh.  I'll grab it, but please at least send along some
> kerneldoc?

Sure and thank you!

-- 
With Best Regards,
Andy Shevchenko