Re: [PATCH] 2.4.22pre10: {,un}likely_p() macros for pointers
From: Jamie Lokier
Date: Sat Aug 09 2003 - 04:40:56 EST
David S. Miller wrote:
> On Sat, 9 Aug 2003 10:13:46 +0200 Willy Tarreau <willy@xxxxxxxxx> wrote:
>
> > (how could !!x be 0 if x isn't ?)
>
> I believe the C language allows for systems where the NULL pointer is
> not zero.
That is irrelevant. The GCC manual says you can't use a pointer as
the argument to __builtin_expect anyway:
Since you are limited to integral expressions for EXP, you should
use constructions such as
if (__builtin_expect (ptr != NULL, 1))
error ();
when testing pointer or floating-point values
-- Jamie
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/