[PATCH] define dummy BUILD_BUG_ON definition for sparse

[KOSAKI Motohiro]

> Hello,
> 
> > diff -puN include/linux/gfp.h~make-sparse-happy-with-gfp_h include/linux/gfp.h
> > --- linux-2.6.git/include/linux/gfp.h~make-sparse-happy-with-gfp_h	2011-04-14 14:47:02.629275904 -0700
> > +++ linux-2.6.git-dave/include/linux/gfp.h	2011-04-14 14:47:38.813272674 -0700
> > @@ -249,14 +249,9 @@ static inline enum zone_type gfp_zone(gf
> >  
> >  	z = (GFP_ZONE_TABLE >> (bit * ZONES_SHIFT)) &
> >  					 ((1 << ZONES_SHIFT) - 1);
> > -
> > -	if (__builtin_constant_p(bit))
> > -		BUILD_BUG_ON((GFP_ZONE_BAD >> bit) & 1);
> > -	else {
> >  #ifdef CONFIG_DEBUG_VM
> > -		BUG_ON((GFP_ZONE_BAD >> bit) & 1);
> > +	BUG_ON((GFP_ZONE_BAD >> bit) & 1);
> >  #endif
> > -	}
> >  	return z;
> 
> Why don't you use VM_BUG_ON?

After while thinking, I decided to make another patch. If we take your
approach we will remove all BUILD_BUG_ON eventually. It's no happy result.