linux-kernel - Re: [PATCH v4 1/1] drm/i915: Move abs

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Message-ID: <ZMx5cp1u5noAH0Zg@smile.fi.intel.com>
Date:   Fri, 4 Aug 2023 07:07:14 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Jani Nikula <jani.nikula@...el.com>,
        Imre Deak <imre.deak@...el.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Andi Shyti <andi.shyti@...ux.intel.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-fbdev@...r.kernel.org,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Helge Deller <deller@....de>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH v4 1/1] drm/i915: Move abs_diff() to math.h

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@...ux.intel.com> 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