Re: [PATCH] fix sparse problems with ARRAY_SIZE

[Al Viro <viro@ftp.linux.org.uk>]

On Tue, Jul 10, 2007 at 09:58:18PM +0100, Al Viro wrote:
> On Tue, Jul 10, 2007 at 11:40:33PM +0400, Alexey Dobriyan wrote:
> > On Tue, Jul 10, 2007 at 06:09:48PM +0200, Adel Gadllah wrote:
> > > --- linux-2.6.orig/include/linux/kernel.h
> > > +++ linux-2.6/include/linux/kernel.h
> > > @@ -35,7 +35,11 @@ extern const char linux_proc_banner[];
> > >  #define ALIGN(x,a)		__ALIGN_MASK(x,(typeof(x))(a)-1)
> > >  #define __ALIGN_MASK(x,mask)	(((x)+(mask))&~(mask))
> > >  
> > > +#ifdef __CHECKER_
> > > +#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
> > > +#else
> > >  #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
> > > +#endif
> > 
> > Al Viro recently gave a hint that he have patches for sparse to not give
> > spurious ARRAY_SIZE warnings.
> 
> I do.  Right now it's either 2 or 4 patches away from mainline sparse,
> depending on reordering...  I'm splitting the last patch in series,
> hopefully will reorder and send tonight.
> 
> Basically, it's a matter of getting __builtin_compatible_types_p()
> implementation (really - evaluate.c:type_difference()) somewhere sane.

Try git://git.kernel.org/pub/scm/linux/kernel/git/viro/sparse.git/,
the branch is type_difference