Andi Kleen <firstname.lastname@example.org> writes:
> Good point. I somehow assumed that __builtin_expect would just signify
> a boolean, but if I read gcc source correctly this was wrong.
Yeh, it's a long so you'll get no cast warnings too.
> Here is an updated patch.
[snip ... ]
> --- include/linux/kernel.h-LIKELY Tue Sep 18 11:12:20 2001
> +++ include/linux/kernel.h Tue Sep 18 14:35:17 2001
> @@ -171,4 +171,14 @@
> char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */
> +/* This loses on a few early 2.96 snapshots, but hopefully nobody uses them anymore. */
> +#if __GNUC__ > 2 || (__GNUC__ == 2 && _GNUC_MINOR__ == 96)
> +#define likely(x) __builtin_expect(!!(x), 1)
> +#define unlikely(x) __builtin_expect((x), 0)
unlikely() also needs to be...
#define unlikely(x) __builtin_expect(!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
> +#define likely(x) (x)
> +#define unlikely(x) (x)
-- # James Antill -- email@example.com :0: * ^From: .*james@and\.org /dev/null - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to firstname.lastname@example.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sun Sep 30 2001 - 21:00:52 EST