Re: [PATCH 2/3] tracing/profile: add ref count for registering profile events

[Peter Zijlstra <peterz@infradead.org>]

On Fri, 2009-09-11 at 09:54 -0400, Steven Rostedt wrote:

> +#ifdef MODULE
> +# define event_trace_up_ref()					\
> +	do {							\
> +		if (!try_module_get(THIS_MODULE)) {		\
> +			atomic_dec(&event_call->profile_count);	\
> +			return -ENOENT;				\
> +		}						\
> +	} while (0)
> +# define event_trace_down_ref() module_put(THIS_MODULE)
> +#else
> +# define event_trace_up_ref() do { } while (0)
> +# define event_trace_down_ref() do { } while (0)
> +#endif

That's like truely gruesomely ugly.

At the very least write it like:

int event_trace_up_ref(struct ftrace_event_call *call)
{
	if (!try_module_get(THIS_MODULE)) {
		atomic_dev(&call->profile_count);
		return -ENOENT;
	}
	return 0;
}