On Fri, Sep 09, 2005 at 06:29:38PM +0100, [EMAIL PROTECTED] wrote:
> > fs/bio.c:686:15: warning: incorrect type in assignment (different address
> > spaces)
> > fs/bio.c:686:15: expected void [noderef] *iov_base<asn:1>
> > fs/bio.c:686:15: got void [noderef] *<noident>
> > from the first form (cast to __user void *). Lovely...
> >
> > OK, I think I know what's going on there, will fix.
>
> What happens is actually pretty simple - we get address_space(1) handled
> in declaration_specifiers(), which sets ctype->as to 1. Then we see
> "void" and eventually get to
> ctype->base_type = type;
> }
>
> check_modifiers(&token->pos, s, ctype->modifiers);
> apply_ctype(token->pos, &thistype, ctype);
> with thistype coming from lookup for "void". And that, of course, has
> zero ->as. Now apply_ctype merrily buggers ctype->as and we have 0...
>
> So AFAICS proper fix for sparse should be to check thistype->as to see
> if it really has any intention to change ->as. ACK?
PS: obvious testcase for that one:
#define X __attribute__((address_space(1)))
void X *p;
void X *q;
void foo(unsigned long n)
{
p = (void X *)n;
q = (X void *)n;
}
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