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Message-ID: <20070710205817.GR21668@ftp.linux.org.uk>
Date: Tue, 10 Jul 2007 21:58:18 +0100
From: Al Viro <viro@....linux.org.uk>
To: Alexey Dobriyan <adobriyan@...il.com>
Cc: Adel Gadllah <adel.gadllah@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix sparse problems with ARRAY_SIZE
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.
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