[sparse fix] (was Re: [PATCH] bogus cast in bio.c)

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



> 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?

--- parse.c	2005-09-07 17:03:13.000000000 -0400
+++ parse.c.new	2005-09-09 13:25:01.000000000 -0400
@@ -636,7 +636,8 @@
 		ctype->alignment = thistype->alignment;
 
 	/* Address space */
-	ctype->as = thistype->as;
+	if (thistype->as)
+		ctype->as = thistype->as;
 }
 
 static void check_modifiers(struct position *pos, struct symbol *s, unsigned long mod)
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]
  Powered by Linux