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

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Date:	Fri, 11 Sep 2009 16:04:21 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>
Subject: Re: [PATCH 2/3] tracing/profile: add ref count for registering
 profile events

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;
}

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