Re: [PATCH v2 1/2] tracing: Move tracepoint callbacks into DEFINE

[Ingo Molnar]

* Josh Stone <jistone@xxxxxxxxxx> wrote:

> It's not strictly correct for the tracepoint reg/unreg callbacks 
> to occur when a client is hooking up, because the actual 
> tracepoint may no be present yet.  This happens to be fine for 
> syscall, since that's in the core kernel, but it would cause 
> problems for tracepoints defined in a module that hasn't been 
> loaded yet.  It also means the reg/unreg has to be EXPORTed for 
> any modules to use the tracepoint (as in SystemTap).
> 
> This patch removes DECLARE_TRACE_WITH_CALLBACK, and instead 
> introduces DEFINE_TRACE_WITH_CALLBACK which stores the callbacks 
> in struct tracepoint.  The callbacks are used now when the active 
> state of the tracepoint changes in set_tracepoint & 
> disable_tracepoint.
> 
> This also introduces TRACE_EVENT_WITH_CALLBACK, so those events 
> can also provide callbacks if needed.

i think something shorter would be nicer, such as:

 DECLARE_TRACE_FN
 TRACE_EVENT_FN

	Ingo
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