[Patch][hw-breakpoint] Use generic hw-breakpoint interfaces for new PPC ptrace flags

[Benjamin Herrenschmidt]

On Fri, 2012-05-11 at 14:13 +0530, K.Prasad wrote:

> +#ifdef CONFIG_HAVE_HW_BREAKPOINT
> +	int ret, len = 0;
> +	struct thread_struct *thread = &(child->thread);
> +	struct perf_event *bp;
> +	struct perf_event_attr attr;
> +#endif /* CONFIG_HAVE_HW_BREAKPOINT */

"ret" is unused in that function, causing a warning which breaks the
build since we have -Werror. I'm fixing that locally but be more careful
next time please.

Ben.