[Intel-gfx] [PATCH 1/2] drm/i915: Document our internal limit on object size

[Chris Wilson]

On Fri, Oct 14, 2016 at 05:03:39PM +0100, Chris Wilson wrote:
> > We could try to future proof more maybe like
> > sizeof(typeof(obj->base.size)), is typeof can be used like that?
> > Something similar for sg API if possible. But then again, it could
> > be better future proofing to be hardcoded like you wrote it. Yes I
> > think so.
> 
> I was just about to write it as obj->base.size, Let's compare!
> 
> #define overflows_type(x, T) \
> 	(sizeof(x) < sizeof(T) && (x) > 1 << (sizeof(T) * BITS_PER_BYTE))

	(sizeof(x) > sizeof(T) && ((x) >= 1 << (sizeof(T) * BITS_PER_BYTE)))
> 
>   if (overflows_type(size, obj->base.size)
> 
> or
> 
>   if (overflows_type(size, size_t))
> 
> I think obj->base.size looks better from the self-documentation standpoint.
> -Chris

-- 
Chris Wilson, Intel Open Source Technology Centre